status-go/protocol/message_persistence.go

3028 lines
79 KiB
Go
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package protocol
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import (
"context"
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"database/sql"
"encoding/json"
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"fmt"
"sort"
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"strings"
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"github.com/golang/protobuf/proto"
"github.com/lib/pq"
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"github.com/status-im/status-go/protocol/common"
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"github.com/status-im/status-go/protocol/protobuf"
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)
var basicMessagesSelectQuery = `
SELECT %s %s
FROM user_messages m1
LEFT JOIN user_messages m2
ON m1.response_to = m2.id
LEFT JOIN contacts c
ON m1.source = c.id
LEFT JOIN discord_messages dm
ON m1.discord_message_id = dm.id
LEFT JOIN discord_message_authors dm_author
ON dm.author_id = dm_author.id
LEFT JOIN discord_message_attachments dm_attachment
ON dm.id = dm_attachment.discord_message_id
LEFT JOIN discord_messages m2_dm
ON m2.discord_message_id = m2_dm.id
LEFT JOIN discord_message_authors m2_dm_author
ON m2_dm.author_id = m2_dm_author.id
LEFT JOIN bridge_messages bm
ON m1.id = bm.user_messages_id
LEFT JOIN bridge_messages bm_response
ON m2.id = bm_response.user_messages_id
`
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var basicInsertDiscordMessageAuthorQuery = `INSERT OR REPLACE INTO discord_message_authors(id,name,discriminator,nickname,avatar_url, avatar_image_payload) VALUES (?,?,?,?,?,?)`
var cursor = "substr('0000000000000000000000000000000000000000000000000000000000000000' || m1.clock_value, -64, 64) || m1.id"
var cursorField = cursor + " as cursor"
func (db sqlitePersistence) buildMessagesQueryWithAdditionalFields(additionalSelectFields, whereAndTheRest string) string {
allFields := db.tableUserMessagesAllFieldsJoin()
if additionalSelectFields != "" {
additionalSelectFields = "," + additionalSelectFields
}
base := fmt.Sprintf(basicMessagesSelectQuery, allFields, additionalSelectFields)
return base + " " + whereAndTheRest
}
func (db sqlitePersistence) buildMessagesQuery(whereAndTheRest string) string {
return db.buildMessagesQueryWithAdditionalFields("", whereAndTheRest)
}
func (db sqlitePersistence) tableUserMessagesAllFields() string {
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return `id,
whisper_timestamp,
source,
text,
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content_type,
username,
timestamp,
chat_id,
local_chat_id,
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message_type,
clock_value,
seen,
outgoing_status,
parsed_text,
sticker_pack,
sticker_hash,
image_payload,
image_type,
album_id,
album_images,
album_images_count,
image_width,
image_height,
image_base64,
audio_payload,
audio_type,
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audio_duration_ms,
audio_base64,
community_id,
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mentions,
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links,
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
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unfurled_links,
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unfurled_status_links,
command_id,
command_value,
command_from,
command_address,
command_contract,
command_transaction_hash,
command_state,
command_signature,
replace_message,
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edited_at,
deleted,
deleted_by,
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deleted_for_me,
rtl,
line_count,
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response_to,
gap_from,
gap_to,
contact_request_state,
contact_verification_status,
mentioned,
replied,
discord_message_id`
}
// keep the same order as in tableUserMessagesScanAllFields
func (db sqlitePersistence) tableUserMessagesAllFieldsJoin() string {
return `m1.id,
m1.whisper_timestamp,
m1.source,
m1.text,
m1.content_type,
m1.username,
m1.timestamp,
m1.chat_id,
m1.local_chat_id,
m1.message_type,
m1.clock_value,
m1.seen,
m1.outgoing_status,
m1.parsed_text,
m1.sticker_pack,
m1.sticker_hash,
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m1.image_payload,
m1.image_type,
COALESCE(m1.album_id, ""),
COALESCE(m1.album_images_count, 0),
COALESCE(m1.image_width, 0),
COALESCE(m1.image_height, 0),
COALESCE(m1.audio_duration_ms,0),
m1.community_id,
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m1.mentions,
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m1.links,
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
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m1.unfurled_links,
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m1.unfurled_status_links,
m1.command_id,
m1.command_value,
m1.command_from,
m1.command_address,
m1.command_contract,
m1.command_transaction_hash,
m1.command_state,
m1.command_signature,
m1.replace_message,
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m1.edited_at,
m1.deleted,
m1.deleted_by,
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m1.deleted_for_me,
m1.rtl,
m1.line_count,
m1.response_to,
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m1.gap_from,
m1.gap_to,
m1.contact_request_state,
m1.contact_verification_status,
m1.mentioned,
m1.replied,
COALESCE(m1.discord_message_id, ""),
COALESCE(dm.author_id, ""),
COALESCE(dm.type, ""),
COALESCE(dm.timestamp, ""),
COALESCE(dm.timestamp_edited, ""),
COALESCE(dm.content, ""),
COALESCE(dm.reference_message_id, ""),
COALESCE(dm.reference_channel_id, ""),
COALESCE(dm_author.name, ""),
COALESCE(dm_author.discriminator, ""),
COALESCE(dm_author.nickname, ""),
COALESCE(dm_author.avatar_url, ""),
COALESCE(dm_attachment.id, ""),
COALESCE(dm_attachment.discord_message_id, ""),
COALESCE(dm_attachment.url, ""),
COALESCE(dm_attachment.file_name, ""),
COALESCE(dm_attachment.content_type, ""),
m2.source,
m2.text,
m2.parsed_text,
m2.album_images,
m2.album_images_count,
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m2.audio_duration_ms,
m2.community_id,
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m2.id,
m2.content_type,
m2.deleted,
m2.deleted_for_me,
c.alias,
c.identicon,
COALESCE(m2.discord_message_id, ""),
COALESCE(m2_dm_author.name, ""),
COALESCE(m2_dm_author.nickname, ""),
COALESCE(m2_dm_author.avatar_url, ""),
COALESCE(bm.bridge_name, ""),
COALESCE(bm.user_name, ""),
COALESCE(bm.user_avatar, ""),
COALESCE(bm.user_id, ""),
COALESCE(bm.content, ""),
COALESCE(bm.message_id, ""),
COALESCE(bm.parent_message_id, ""),
COALESCE(bm_response.bridge_name, ""),
COALESCE(bm_response.user_name, ""),
COALESCE(bm_response.user_avatar, ""),
COALESCE(bm_response.user_id, ""),
COALESCE(bm_response.content, "")`
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}
func (db sqlitePersistence) tableUserMessagesAllFieldsCount() int {
return strings.Count(db.tableUserMessagesAllFields(), ",") + 1
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}
type scanner interface {
Scan(dest ...interface{}) error
}
// keep the same order as in tableUserMessagesAllFieldsJoin
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func (db sqlitePersistence) tableUserMessagesScanAllFields(row scanner, message *common.Message, others ...interface{}) error {
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var quotedID sql.NullString
var ContentType sql.NullInt64
var quotedText sql.NullString
var quotedParsedText []byte
var quotedAlbumImages []byte
var quotedAlbumImagesCount sql.NullInt64
var quotedFrom sql.NullString
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var quotedAudioDuration sql.NullInt64
var quotedCommunityID sql.NullString
var quotedDeleted sql.NullBool
var quotedDeletedForMe sql.NullBool
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var serializedMentions []byte
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var serializedLinks []byte
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
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var serializedUnfurledLinks []byte
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var serializedUnfurledStatusLinks []byte
var alias sql.NullString
var identicon sql.NullString
var communityID sql.NullString
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var gapFrom sql.NullInt64
var gapTo sql.NullInt64
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var editedAt sql.NullInt64
var deleted sql.NullBool
var deletedBy sql.NullString
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var deletedForMe sql.NullBool
var contactRequestState sql.NullInt64
var contactVerificationState sql.NullInt64
sticker := &protobuf.StickerMessage{}
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command := &common.CommandParameters{}
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audio := &protobuf.AudioMessage{}
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image := &protobuf.ImageMessage{}
discordMessage := &protobuf.DiscordMessage{
Author: &protobuf.DiscordMessageAuthor{},
Reference: &protobuf.DiscordMessageReference{},
Attachments: []*protobuf.DiscordMessageAttachment{},
}
bridgeMessage := &protobuf.BridgeMessage{}
quotedBridgeMessage := &protobuf.BridgeMessage{}
quotedDiscordMessage := &protobuf.DiscordMessage{
Author: &protobuf.DiscordMessageAuthor{},
}
attachment := &protobuf.DiscordMessageAttachment{}
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args := []interface{}{
&message.ID,
&message.WhisperTimestamp,
&message.From, // source in table
&message.Text,
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&message.ContentType,
&message.Alias,
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&message.Timestamp,
&message.ChatId,
&message.LocalChatID,
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&message.MessageType,
&message.Clock,
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&message.Seen,
&message.OutgoingStatus,
&message.ParsedText,
&sticker.Pack,
&sticker.Hash,
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&image.Payload,
&image.Format,
&image.AlbumId,
&image.AlbumImagesCount,
&image.Width,
&image.Height,
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&audio.DurationMs,
&communityID,
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&serializedMentions,
2020-10-27 17:35:28 +00:00
&serializedLinks,
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
2023-05-18 18:43:06 +00:00
&serializedUnfurledLinks,
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&serializedUnfurledStatusLinks,
&command.ID,
&command.Value,
&command.From,
&command.Address,
&command.Contract,
&command.TransactionHash,
&command.CommandState,
&command.Signature,
&message.Replace,
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&editedAt,
&deleted,
&deletedBy,
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&deletedForMe,
&message.RTL,
&message.LineCount,
&message.ResponseTo,
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&gapFrom,
&gapTo,
&contactRequestState,
&contactVerificationState,
&message.Mentioned,
&message.Replied,
&discordMessage.Id,
&discordMessage.Author.Id,
&discordMessage.Type,
&discordMessage.Timestamp,
&discordMessage.TimestampEdited,
&discordMessage.Content,
&discordMessage.Reference.MessageId,
&discordMessage.Reference.ChannelId,
&discordMessage.Author.Name,
&discordMessage.Author.Discriminator,
&discordMessage.Author.Nickname,
&discordMessage.Author.AvatarUrl,
&attachment.Id,
&attachment.MessageId,
&attachment.Url,
&attachment.FileName,
&attachment.ContentType,
&quotedFrom,
&quotedText,
&quotedParsedText,
&quotedAlbumImages,
&quotedAlbumImagesCount,
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&quotedAudioDuration,
&quotedCommunityID,
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&quotedID,
&ContentType,
&quotedDeleted,
&quotedDeletedForMe,
&alias,
&identicon,
&quotedDiscordMessage.Id,
&quotedDiscordMessage.Author.Name,
&quotedDiscordMessage.Author.Nickname,
&quotedDiscordMessage.Author.AvatarUrl,
&bridgeMessage.BridgeName,
&bridgeMessage.UserName,
&bridgeMessage.UserAvatar,
&bridgeMessage.UserID,
&bridgeMessage.Content,
&bridgeMessage.MessageID,
&bridgeMessage.ParentMessageID,
&quotedBridgeMessage.BridgeName,
&quotedBridgeMessage.UserName,
&quotedBridgeMessage.UserAvatar,
&quotedBridgeMessage.UserID,
&quotedBridgeMessage.Content,
}
err := row.Scan(append(args, others...)...)
if err != nil {
return err
}
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if editedAt.Valid {
message.EditedAt = uint64(editedAt.Int64)
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}
if deleted.Valid {
message.Deleted = deleted.Bool
}
if deletedBy.Valid {
message.DeletedBy = deletedBy.String
}
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if deletedForMe.Valid {
message.DeletedForMe = deletedForMe.Bool
}
if contactRequestState.Valid {
message.ContactRequestState = common.ContactRequestState(contactRequestState.Int64)
}
if contactVerificationState.Valid {
message.ContactVerificationState = common.ContactVerificationState(contactVerificationState.Int64)
}
if quotedText.Valid {
if quotedDeleted.Bool || quotedDeletedForMe.Bool {
message.QuotedMessage = &common.QuotedMessage{
ID: quotedID.String,
From: quotedFrom.String,
Deleted: quotedDeleted.Bool,
DeletedForMe: quotedDeletedForMe.Bool,
}
} else {
message.QuotedMessage = &common.QuotedMessage{
ID: quotedID.String,
ContentType: ContentType.Int64,
From: quotedFrom.String,
Text: quotedText.String,
ParsedText: quotedParsedText,
AlbumImages: quotedAlbumImages,
AlbumImagesCount: quotedAlbumImagesCount.Int64,
CommunityID: quotedCommunityID.String,
Deleted: quotedDeleted.Bool,
}
if message.QuotedMessage.ContentType == int64(protobuf.ChatMessage_DISCORD_MESSAGE) {
message.QuotedMessage.DiscordMessage = quotedDiscordMessage
}
if message.QuotedMessage.ContentType == int64(protobuf.ChatMessage_BRIDGE_MESSAGE) {
message.QuotedMessage.BridgeMessage = quotedBridgeMessage
}
}
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}
message.Alias = alias.String
message.Identicon = identicon.String
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if gapFrom.Valid && gapTo.Valid {
message.GapParameters = &common.GapParameters{
From: uint32(gapFrom.Int64),
To: uint32(gapTo.Int64),
}
}
if communityID.Valid {
message.CommunityID = communityID.String
}
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if serializedMentions != nil {
err := json.Unmarshal(serializedMentions, &message.Mentions)
if err != nil {
return err
}
}
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if serializedLinks != nil {
err := json.Unmarshal(serializedLinks, &message.Links)
if err != nil {
return err
}
}
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
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if serializedUnfurledLinks != nil {
err = json.Unmarshal(serializedUnfurledLinks, &message.UnfurledLinks)
if err != nil {
return err
}
}
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if serializedUnfurledStatusLinks != nil {
// use proto.Marshal, because json.Marshal doesn't support `oneof` fields
var links protobuf.UnfurledStatusLinks
err = proto.Unmarshal(serializedUnfurledStatusLinks, &links)
if err != nil {
return err
}
message.UnfurledStatusLinks = &links
}
if attachment.Id != "" {
discordMessage.Attachments = append(discordMessage.Attachments, attachment)
}
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switch message.ContentType {
case protobuf.ChatMessage_STICKER:
message.Payload = &protobuf.ChatMessage_Sticker{Sticker: sticker}
case protobuf.ChatMessage_AUDIO:
message.Payload = &protobuf.ChatMessage_Audio{Audio: audio}
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case protobuf.ChatMessage_TRANSACTION_COMMAND:
message.CommandParameters = command
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case protobuf.ChatMessage_IMAGE:
message.Payload = &protobuf.ChatMessage_Image{Image: image}
case protobuf.ChatMessage_DISCORD_MESSAGE:
message.Payload = &protobuf.ChatMessage_DiscordMessage{
DiscordMessage: discordMessage,
}
case protobuf.ChatMessage_BRIDGE_MESSAGE:
message.Payload = &protobuf.ChatMessage_BridgeMessage{
BridgeMessage: bridgeMessage,
}
}
return nil
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}
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func (db sqlitePersistence) tableUserMessagesAllValues(message *common.Message) ([]interface{}, error) {
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var gapFrom, gapTo uint32
var albumImages []byte
if message.QuotedMessage != nil {
albumImages = []byte(message.QuotedMessage.AlbumImages)
}
sticker := message.GetSticker()
if sticker == nil {
sticker = &protobuf.StickerMessage{}
}
image := message.GetImage()
if image == nil {
image = &protobuf.ImageMessage{}
}
audio := message.GetAudio()
if audio == nil {
audio = &protobuf.AudioMessage{}
}
command := message.CommandParameters
if command == nil {
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command = &common.CommandParameters{}
}
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discordMessage := message.GetDiscordMessage()
if discordMessage == nil {
discordMessage = &protobuf.DiscordMessage{
Author: &protobuf.DiscordMessageAuthor{},
Reference: &protobuf.DiscordMessageReference{},
Attachments: make([]*protobuf.DiscordMessageAttachment, 0),
}
}
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if message.GapParameters != nil {
gapFrom = message.GapParameters.From
gapTo = message.GapParameters.To
}
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var serializedMentions []byte
var err error
if len(message.Mentions) != 0 {
serializedMentions, err = json.Marshal(message.Mentions)
if err != nil {
return nil, err
}
}
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var serializedLinks []byte
if len(message.Links) != 0 {
serializedLinks, err = json.Marshal(message.Links)
if err != nil {
return nil, err
}
}
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
2023-05-18 18:43:06 +00:00
var serializedUnfurledLinks []byte
if links := message.GetUnfurledLinks(); links != nil {
serializedUnfurledLinks, err = json.Marshal(links)
if err != nil {
return nil, err
}
}
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var serializedUnfurledStatusLinks []byte
if links := message.GetUnfurledStatusLinks(); links != nil {
// use proto.Marshal, because json.Marshal doesn't support `oneof` fields
serializedUnfurledStatusLinks, err = proto.Marshal(links)
if err != nil {
return nil, err
}
}
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return []interface{}{
message.ID,
message.WhisperTimestamp,
message.From, // source in table
message.Text,
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message.ContentType,
message.Alias,
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message.Timestamp,
message.ChatId,
message.LocalChatID,
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message.MessageType,
message.Clock,
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message.Seen,
message.OutgoingStatus,
message.ParsedText,
sticker.Pack,
sticker.Hash,
image.Payload,
image.Format,
image.AlbumId,
albumImages,
image.AlbumImagesCount,
image.Width,
image.Height,
message.Base64Image,
audio.Payload,
audio.Type,
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audio.DurationMs,
message.Base64Audio,
message.CommunityID,
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serializedMentions,
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serializedLinks,
URL unfurling (initial implementation) (#3471) This is the initial implementation for the new URL unfurling requirements. The most important one is that only the message sender will pay the privacy cost for unfurling and extracting metadata from websites. Once the message is sent, the unfurled data will be stored at the protocol level and receivers will just profit and happily decode the metadata to render it. Further development of this URL unfurling capability will be mostly guided by issues created on clients. For the moment in status-mobile: https://github.com/status-im/status-mobile/labels/url-preview - https://github.com/status-im/status-mobile/issues/15918 - https://github.com/status-im/status-mobile/issues/15917 - https://github.com/status-im/status-mobile/issues/15910 - https://github.com/status-im/status-mobile/issues/15909 - https://github.com/status-im/status-mobile/issues/15908 - https://github.com/status-im/status-mobile/issues/15906 - https://github.com/status-im/status-mobile/issues/15905 ### Terminology In the code, I've tried to stick to the word "unfurl URL" to really mean the process of extracting metadata from a website, sort of lower level. I use "link preview" to mean a higher level structure which is enriched by unfurled data. "link preview" is also how designers refer to it. ### User flows 1. Carol needs to see link previews while typing in the chat input field. Notice from the diagram nothing is persisted and that status-go endpoints are essentially stateless. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_getTextURLs Server-->>Client: Normalized URLs Client->>Client: Render cached unfurled URLs Client->>Server: Unfurl non-cached URLs.\nCall wakuext_unfurlURLs Server->>Website: Fetch metadata Website-->>Server: Metadata (thumbnail URL, title, etc) Server->>Website: Fetch thumbnail Server->>Website: Fetch favicon Website-->>Server: Favicon bytes Website-->>Server: Thumbnail bytes Server->>Server: Decode & process images Server-->>Client: Unfurled data (thumbnail data URI, etc) #+end_src ``` ``` ,------. ,------. ,-------. |Client| |Server| |Website| `--+---' `--+---' `---+---' | Call wakuext_getTextURLs | | | ---------------------------------------> | | | | | Normalized URLs | | | <- - - - - - - - - - - - - - - - - - - - | | | | |----. | | | | Render cached unfurled URLs | | |<---' | | | | | | Unfurl non-cached URLs. | | | Call wakuext_unfurlURLs | | | ---------------------------------------> | | | | | | Fetch metadata | | | ------------------------------------> | | | | | Metadata (thumbnail URL, title, etc)| | | <- - - - - - - - - - - - - - - - - - | | | | | Fetch thumbnail | | | ------------------------------------> | | | | | Fetch favicon | | | ------------------------------------> | | | | | Favicon bytes | | | <- - - - - - - - - - - - - - - - - - | | | | | Thumbnail bytes | | | <- - - - - - - - - - - - - - - - - - | | | | |----. | | | | Decode & process images | | |<---' | | | | | Unfurled data (thumbnail data URI, etc)| | | <- - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,---+---. |Client| |Server| |Website| `------' `------' `-------' ``` 2. Carol sends the text message with link previews in the RPC request wakuext_sendChatMessages. status-go assumes the link previews are good because it can't and shouldn't attempt to re-unfurl them. ``` #+begin_src plantuml :results verbatim Client->>Server: Call wakuext_sendChatMessages Server->>Server: Transform link previews to\nbe proto-marshalled Server->DB: Write link previews serialized as JSON Server-->>Client: Updated message response #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | Call wakuext_sendChatMessages| | | -----------------------------> | | | | | |----. | | | | Transform link previews to | | |<---' be proto-marshalled | | | | | | | | | Write link previews serialized as JSON| | | --------------------------------------> | | | | Updated message response | | | <- - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` 3. The message was sent over waku and persisted locally in Carol's device. She should now see the link previews in the chat history. There can be many link previews shared by other chat members, therefore it is important to serve the assets via the media server to avoid overloading the ReactNative bridge with lots of big JSON payloads containing base64 encoded data URIs (maybe this concern is meaningless for desktop). When a client is rendering messages with link previews, they will have the field linkPreviews, and the thumbnail URL will point to the local media server. ``` #+begin_src plantuml :results verbatim Client->>Server: GET /link-preview/thumbnail (media server) Server->>DB: Read from user_messages.unfurled_links Server->Server: Unmarshal JSON Server-->>Client: HTTP Content-Type: image/jpeg/etc #+end_src ``` ``` ,------. ,------. ,--. |Client| |Server| |DB| `--+---' `--+---' `+-' | GET /link-preview/thumbnail (media server)| | | ------------------------------------------> | | | | | | Read from user_messages.unfurled_links| | | --------------------------------------> | | | | |----. | | | | Unmarshal JSON | | |<---' | | | | | HTTP Content-Type: image/jpeg/etc | | | <- - - - - - - - - - - - - - - - - - - - - | ,--+---. ,--+---. ,+-. |Client| |Server| |DB| `------' `------' `--' ``` ### Some limitations of the current implementation The following points will become separate issues in status-go that I'll work on over the next couple weeks. In no order of importance: - Improve how multiple links are fetched; retries on failure and testing how unfurling behaves around the timeout limits (deterministically, not by making real HTTP calls as I did). https://github.com/status-im/status-go/issues/3498 - Unfurl favicons and store them in the protobuf too. - For this PR, I added unfurling support only for websites with OpenGraph https://ogp.me/ meta tags. Other unfurlers will be implemented on demand. The next one will probably be for oEmbed https://oembed.com/, the protocol supported by YouTube, for example. - Resize and/or compress thumbnails (and favicons). Often times, thumbnails are huge for the purposes of link previews. There is already support for compressing JPEGs in status-go, but I prefer to work with compression in a separate PR because I'd like to also solve the problem for PNGs (probably convert them to JPEGs, plus compress them). This would be a safe choice for thumbnails, favicons not so much because transparency is desirable. - Editing messages is not yet supported. - I haven't coded any artificial limit on the number of previews or on the size of the thumbnail payload. This will be done in a separate issue. I have heard the ideal solution may be to split messages into smaller chunks of ~125 KiB because of libp2p, but that might be too complicated at this stage of the product (?). - Link preview deletion. - For the moment, OpenGraph metadata is extracted by requesting data for the English language (and fallback to whatever is available). In the future, we'll want to unfurl by respecting the user's local device language. Some websites, like GoDaddy, are already localized based on the device's IP, but many aren't. - The website's description text should be limited by a certain number of characters, especially because it's outside our control. Exactly how much has not been decided yet, so it'll be done separately. - URL normalization can be tricky, so I implemented only the basics to help with caching. For example, the url https://status.im and HTTPS://status.im are considered identical. Also, a URL is considered valid for unfurling if its TLD exists according to publicsuffix.EffectiveTLDPlusOne. This was essential, otherwise the default Go url.Parse approach would consider many invalid URLs valid, and thus the server would waste resources trying to unfurl the unfurleable. ### Other requirements - If the message is edited, the link previews should reflect the edited text, not the original one. This has been aligned with the design team as well. - If the website's thumbnail or the favicon can't be fetched, just ignore them. The only mandatory piece of metadata is the website's title and URL. - Link previews in clients should be generated in near real-time, that is, as the user types, previews are updated. In mobile this performs very well, and it's what other clients like WhatsApp, Telegram, and Facebook do. ### Decisions - While the user typing in the input field, the client is constantly (debounced) asking status-go to parse the text and extract normalized URLs and then the client checks if they're already in its in-memory cache. If they are, no RPC call is made. I chose this approach to achieve the best possible performance in mobile and avoid the whole RPC overhead, since the chat experience is already not smooth enough. The mobile client uses URLs as cache keys in a hashmap, i.e. if the key is present, it means the preview is readily available (naive, but good enough for now). This decision also gave me more flexibility to find the best UX at this stage of the feature. - Due to the requirement that users should be able to see independent loading indicators for each link preview, when status-go can't unfurl a URL, it doesn't return it in the response. - As an initial implementation, I added the BLOB column unfurled_links to the user_messages table. The preview data is then serialized as JSON before being stored in this column. I felt that creating a separate table and the related code for this initial PR would be inconvenient. Is that reasonable to you? Once things stabilize I can create a proper table if we want to avoid this kind of solution with serialized columns.
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serializedUnfurledLinks,
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serializedUnfurledStatusLinks,
command.ID,
command.Value,
command.From,
command.Address,
command.Contract,
command.TransactionHash,
command.CommandState,
command.Signature,
message.Replace,
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int64(message.EditedAt),
message.Deleted,
message.DeletedBy,
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message.DeletedForMe,
message.RTL,
message.LineCount,
message.ResponseTo,
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gapFrom,
gapTo,
message.ContactRequestState,
message.ContactVerificationState,
message.Mentioned,
message.Replied,
discordMessage.Id,
}, nil
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}
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func (db sqlitePersistence) messageByID(tx *sql.Tx, id string) (*common.Message, error) {
var err error
if tx == nil {
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return nil, err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
}
query := db.buildMessagesQuery("WHERE m1.id = ?")
rows, err := tx.Query(query, id)
if err != nil {
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return nil, err
}
defer rows.Close()
return getMessageFromScanRows(db, rows)
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}
func (db sqlitePersistence) albumMessages(chatID, albumID string) ([]*common.Message, error) {
if albumID == "" {
return nil, nil
}
query := db.buildMessagesQuery("WHERE m1.album_id = ? and m1.local_chat_id = ?")
rows, err := db.db.Query(query, albumID, chatID)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessagesFromScanRows(db, rows, false)
}
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func (db sqlitePersistence) MessageByCommandID(chatID, id string) (*common.Message, error) {
where := `WHERE
m1.command_id = ?
AND
m1.local_chat_id = ?
ORDER BY m1.clock_value DESC
LIMIT 1`
query := db.buildMessagesQuery(where)
rows, err := db.db.Query(query, id, chatID)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessageFromScanRows(db, rows)
}
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func (db sqlitePersistence) MessageByID(id string) (*common.Message, error) {
return db.messageByID(nil, id)
}
func (db sqlitePersistence) AlbumMessages(chatID, albumID string) ([]*common.Message, error) {
return db.albumMessages(chatID, albumID)
}
func (db sqlitePersistence) MessagesExist(ids []string) (map[string]bool, error) {
result := make(map[string]bool)
if len(ids) == 0 {
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return result, nil
}
idsArgs := make([]interface{}, 0, len(ids))
for _, id := range ids {
idsArgs = append(idsArgs, id)
}
inVector := strings.Repeat("?, ", len(ids)-1) + "?"
query := "SELECT id FROM user_messages WHERE id IN (" + inVector + ")" // nolint: gosec
rows, err := db.db.Query(query, idsArgs...)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var id string
err := rows.Scan(&id)
if err != nil {
return nil, err
}
result[id] = true
}
return result, nil
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}
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func (db sqlitePersistence) MessagesByIDs(ids []string) ([]*common.Message, error) {
if len(ids) == 0 {
return nil, nil
}
idsArgs := make([]interface{}, 0, len(ids))
for _, id := range ids {
idsArgs = append(idsArgs, id)
}
inVector := strings.Repeat("?, ", len(ids)-1) + "?"
// nolint: gosec
where := fmt.Sprintf("WHERE NOT(m1.hide) AND m1.id IN (%s)", inVector)
query := db.buildMessagesQuery(where)
rows, err := db.db.Query(query, idsArgs...)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessagesFromScanRows(db, rows, false)
}
func (db sqlitePersistence) MessagesByResponseTo(responseTo string) ([]*common.Message, error) {
where := "WHERE m1.response_to = ?"
query := db.buildMessagesQuery(where)
rows, err := db.db.Query(query, responseTo)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessagesFromScanRows(db, rows, false)
}
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// MessageByChatID returns all messages for a given chatID in descending order.
// Ordering is accomplished using two concatenated values: ClockValue and ID.
// These two values are also used to compose a cursor which is returned to the result.
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func (db sqlitePersistence) MessageByChatID(chatID string, currCursor string, limit int) ([]*common.Message, string, error) {
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cursorWhere := ""
if currCursor != "" {
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cursorWhere = "AND cursor <= ?" //nolint: goconst
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}
args := []interface{}{chatID}
if currCursor != "" {
args = append(args, currCursor)
}
// Build a new column `cursor` at the query time by having a fixed-sized clock value at the beginning
// concatenated with message ID. Results are sorted using this new column.
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// This new column values can also be returned as a cursor for subsequent requests.
where := fmt.Sprintf(`
WHERE
NOT(m1.hide) AND m1.local_chat_id = ? %s
ORDER BY cursor DESC
LIMIT ?`, cursorWhere)
query := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(
query,
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append(args, limit+1)..., // take one more to figure our whether a cursor should be returned
)
if err != nil {
return nil, "", err
}
defer rows.Close()
result, cursors, err := getMessagesAndCursorsFromScanRows(db, rows)
if err != nil {
return nil, "", err
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}
var newCursor string
if len(result) > limit {
newCursor = cursors[limit]
result = result[:limit]
}
return result, newCursor, nil
}
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func (db sqlitePersistence) FirstUnseenMessageID(chatID string) (string, error) {
var id string
err := db.db.QueryRow(`
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SELECT
id
FROM
user_messages m1
WHERE
m1.local_chat_id = ?
AND NOT(m1.seen) AND NOT(m1.hide) AND NOT(m1.deleted) AND NOT(m1.deleted_for_me)
ORDER BY m1.clock_value ASC
LIMIT 1`,
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chatID).Scan(&id)
if err == sql.ErrNoRows {
return "", nil
}
if err != nil {
return "", err
}
return id, nil
}
// Get last chat message that is not hide or deleted or deleted_for_me
func (db sqlitePersistence) LatestMessageByChatID(chatID string) ([]*common.Message, error) {
args := []interface{}{chatID}
where := `WHERE
NOT(m1.hide) AND NOT(m1.deleted) AND NOT(m1.deleted_for_me) AND m1.local_chat_id = ?
ORDER BY cursor DESC
LIMIT ?`
query := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(
query,
append(args, 2)..., // take one more to figure our whether a cursor should be returned
)
if err != nil {
return nil, err
}
defer rows.Close()
result, _, err := getMessagesAndCursorsFromScanRows(db, rows)
if err != nil {
return nil, err
}
if len(result) > 1 {
result = result[:1]
}
return result, nil
}
func (db sqlitePersistence) latestIncomingMessageClock(chatID string) (uint64, error) {
var clock uint64
err := db.db.QueryRow(
fmt.Sprintf(
`
SELECT
clock_value
FROM
user_messages m1
WHERE
m1.local_chat_id = ? AND m1.outgoing_status = ''
%s DESC
LIMIT 1
`, cursor),
chatID).Scan(&clock)
if err != nil {
return 0, err
}
return clock, nil
}
func (db sqlitePersistence) PendingContactRequests(currCursor string, limit int) ([]*common.Message, string, error) {
cursorWhere := ""
if currCursor != "" {
cursorWhere = "AND cursor <= ?" //nolint: goconst
}
args := []interface{}{protobuf.ChatMessage_CONTACT_REQUEST}
if currCursor != "" {
args = append(args, currCursor)
}
// Build a new column `cursor` at the query time by having a fixed-sized clock value at the beginning
// concatenated with message ID. Results are sorted using this new column.
// This new column values can also be returned as a cursor for subsequent requests.
where := fmt.Sprintf(`
WHERE
NOT(m1.hide) AND NOT(m1.seen) AND m1.content_type = ? %s
ORDER BY cursor DESC
LIMIT ?`, cursorWhere)
query := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(
query,
append(args, limit+1)..., // take one more to figure our whether a cursor should be returned
)
if err != nil {
return nil, "", err
}
defer rows.Close()
result, cursors, err := getMessagesAndCursorsFromScanRows(db, rows)
if err != nil {
return nil, "", err
}
var newCursor string
if len(result) > limit {
newCursor = cursors[limit]
result = result[:limit]
}
return result, newCursor, nil
}
func (db sqlitePersistence) LatestPendingContactRequestIDForContact(contactID string) (string, error) {
var id string
err := db.db.QueryRow(
fmt.Sprintf(
`
SELECT
id
FROM
user_messages m1
WHERE
m1.local_chat_id = ? AND m1.content_type = ?
ORDER BY %s DESC
LIMIT 1
`, cursor),
contactID, protobuf.ChatMessage_CONTACT_REQUEST).Scan(&id)
if err == sql.ErrNoRows {
return "", nil
}
if err != nil {
return "", err
}
return id, nil
}
func (db sqlitePersistence) LatestContactRequestIDs() (map[string]common.ContactRequestState, error) {
res := map[string]common.ContactRequestState{}
rows, err := db.db.Query(
fmt.Sprintf(
`
SELECT
id, contact_request_state
FROM
user_messages m1
WHERE
m1.content_type = ?
ORDER BY %s DESC
LIMIT 20
`, cursor), protobuf.ChatMessage_CONTACT_REQUEST)
if err != nil {
return res, err
}
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defer rows.Close()
for rows.Next() {
var id string
var contactRequestState sql.NullInt64
err := rows.Scan(&id, &contactRequestState)
if err != nil {
return nil, err
}
res[id] = common.ContactRequestState(contactRequestState.Int64)
}
return res, nil
}
// AllMessageByChatIDWhichMatchPattern returns all messages which match the search
// term, for a given chatID in descending order.
// Ordering is accomplished using two concatenated values: ClockValue and ID.
// These two values are also used to compose a cursor which is returned to the result.
func (db sqlitePersistence) AllMessageByChatIDWhichMatchTerm(chatID string, searchTerm string, caseSensitive bool) ([]*common.Message, error) {
if searchTerm == "" {
return nil, fmt.Errorf("empty search term")
}
searchCond := ""
if caseSensitive {
searchCond = "AND m1.text LIKE '%' || ? || '%'"
} else {
searchCond = "AND LOWER(m1.text) LIKE LOWER('%' || ? || '%')"
}
where := fmt.Sprintf(`
WHERE
NOT(m1.hide) AND m1.local_chat_id = ? %s
ORDER BY cursor DESC`, searchCond)
query := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(
query,
chatID, searchTerm,
)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessagesFromScanRows(db, rows, true)
}
// AllMessagesFromChatsAndCommunitiesWhichMatchTerm returns all messages which match the search
// term, if they belong to either any chat from the chatIds array or any channel of any community
// from communityIds array.
// Ordering is accomplished using two concatenated values: ClockValue and ID.
// These two values are also used to compose a cursor which is returned to the result.
func (db sqlitePersistence) AllMessagesFromChatsAndCommunitiesWhichMatchTerm(communityIds []string, chatIds []string, searchTerm string, caseSensitive bool) ([]*common.Message, error) {
if searchTerm == "" {
return nil, fmt.Errorf("empty search term")
}
chatsCond := ""
if len(chatIds) > 0 {
inVector := strings.Repeat("?, ", len(chatIds)-1) + "?"
chatsCond = `m1.local_chat_id IN (%s)`
chatsCond = fmt.Sprintf(chatsCond, inVector)
}
communitiesCond := ""
if len(communityIds) > 0 {
inVector := strings.Repeat("?, ", len(communityIds)-1) + "?"
communitiesCond = `m1.local_chat_id IN (SELECT id FROM chats WHERE community_id IN (%s))`
communitiesCond = fmt.Sprintf(communitiesCond, inVector)
}
searchCond := ""
if caseSensitive {
searchCond = "m1.text LIKE '%' || ? || '%'"
} else {
searchCond = "LOWER(m1.text) LIKE LOWER('%' || ? || '%')"
}
finalCond := "AND %s AND %s"
if len(communityIds) > 0 && len(chatIds) > 0 {
finalCond = "AND (%s OR %s) AND %s"
finalCond = fmt.Sprintf(finalCond, chatsCond, communitiesCond, searchCond)
} else if len(chatIds) > 0 {
finalCond = fmt.Sprintf(finalCond, chatsCond, searchCond)
} else if len(communityIds) > 0 {
finalCond = fmt.Sprintf(finalCond, communitiesCond, searchCond)
} else {
return nil, fmt.Errorf("you must specify either community ids or chat ids or both")
}
var parameters []string
parameters = append(parameters, chatIds...)
parameters = append(parameters, communityIds...)
parameters = append(parameters, searchTerm)
idsArgs := make([]interface{}, 0, len(parameters))
for _, param := range parameters {
idsArgs = append(idsArgs, param)
}
where := fmt.Sprintf(`
WHERE
NOT(m1.hide) %s
ORDER BY cursor DESC`, finalCond)
finalQuery := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(finalQuery, idsArgs...)
if err != nil {
return nil, err
}
defer rows.Close()
return getMessagesFromScanRows(db, rows, true)
}
func (db sqlitePersistence) AllChatIDsByCommunity(tx *sql.Tx, communityID string) ([]string, error) {
var err error
var rows *sql.Rows
query := "SELECT id FROM chats WHERE community_id = ?"
if tx == nil {
rows, err = db.db.Query(query, communityID)
} else {
rows, err = tx.Query(query, communityID)
}
if err != nil {
return nil, err
}
defer rows.Close()
var rst []string
for rows.Next() {
var chatID string
err = rows.Scan(&chatID)
if err != nil {
return nil, err
}
rst = append(rst, chatID)
}
return rst, nil
}
func (db sqlitePersistence) CountActiveChattersInCommunity(communityID string, activeAfterTimestamp int64) (uint, error) {
var activeChattersCount uint
err := db.db.QueryRow(
`
SELECT COUNT(DISTINCT source)
FROM user_messages
JOIN chats ON user_messages.local_chat_id = chats.id
WHERE chats.community_id = ?
AND user_messages.timestamp >= ?
`, communityID, activeAfterTimestamp).Scan(&activeChattersCount)
if err == sql.ErrNoRows {
return 0, nil
}
if err != nil {
return 0, err
}
return activeChattersCount, nil
}
// PinnedMessageByChatID returns all pinned messages for a given chatID in descending order.
// Ordering is accomplished using two concatenated values: ClockValue and ID.
// These two values are also used to compose a cursor which is returned to the result.
func (db sqlitePersistence) PinnedMessageByChatIDs(chatIDs []string, currCursor string, limit int) ([]*common.PinnedMessage, string, error) {
cursorWhere := ""
if currCursor != "" {
cursorWhere = "AND cursor <= ?" //nolint: goconst
}
args := make([]interface{}, len(chatIDs))
for i, v := range chatIDs {
args[i] = v
}
if currCursor != "" {
args = append(args, currCursor)
}
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limitStr := ""
if limit > -1 {
args = append(args, limit+1) // take one more to figure our whether a cursor should be returned
}
// Build a new column `cursor` at the query time by having a fixed-sized clock value at the beginning
// concatenated with message ID. Results are sorted using this new column.
// This new column values can also be returned as a cursor for subsequent requests.
allFields := db.tableUserMessagesAllFieldsJoin()
rows, err := db.db.Query(
fmt.Sprintf(`
SELECT
%s,
pm.clock_value as pinnedAt,
pm.pinned_by as pinnedBy,
%s
FROM
pin_messages pm
JOIN
user_messages m1
ON
pm.message_id = m1.id
LEFT JOIN
user_messages m2
ON
m1.response_to = m2.id
LEFT JOIN
contacts c
ON
m1.source = c.id
LEFT JOIN
discord_messages dm
ON
m1.discord_message_id = dm.id
LEFT JOIN
discord_message_authors dm_author
ON
dm.author_id = dm_author.id
LEFT JOIN
discord_message_attachments dm_attachment
ON
dm.id = dm_attachment.discord_message_id
LEFT JOIN
discord_messages m2_dm
ON
m2.discord_message_id = m2_dm.id
LEFT JOIN
discord_message_authors m2_dm_author
ON
m2_dm.author_id = m2_dm_author.id
LEFT JOIN bridge_messages bm
ON m1.id = bm.user_messages_id
LEFT JOIN bridge_messages bm_response
ON m2.id = bm_response.user_messages_id
WHERE
pm.pinned = 1
AND NOT(m1.hide) AND m1.local_chat_id IN %s %s
ORDER BY cursor DESC
%s
`, allFields, cursorField, "(?"+strings.Repeat(",?", len(chatIDs)-1)+")", cursorWhere, limitStr),
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args..., // take one more to figure our whether a cursor should be returned
)
if err != nil {
return nil, "", err
}
defer rows.Close()
result, cursors, err := getPinnedMessagesAndCursorsFromScanRows(db, rows)
if err != nil {
return nil, "", err
}
var newCursor string
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if limit > -1 && len(result) > limit && cursors != nil {
newCursor = cursors[limit]
result = result[:limit]
}
return result, newCursor, nil
}
func (db sqlitePersistence) PinnedMessageByChatID(chatID string, currCursor string, limit int) ([]*common.PinnedMessage, string, error) {
return db.PinnedMessageByChatIDs([]string{chatID}, currCursor, limit)
}
2020-11-03 10:16:05 +00:00
// MessageByChatIDs returns all messages for a given chatIDs in descending order.
// Ordering is accomplished using two concatenated values: ClockValue and ID.
// These two values are also used to compose a cursor which is returned to the result.
func (db sqlitePersistence) MessageByChatIDs(chatIDs []string, currCursor string, limit int) ([]*common.Message, string, error) {
cursorWhere := ""
if currCursor != "" {
2020-11-05 16:07:24 +00:00
cursorWhere = "AND cursor <= ?" //nolint: goconst
2020-11-03 10:16:05 +00:00
}
args := make([]interface{}, len(chatIDs))
for i, v := range chatIDs {
args[i] = v
}
if currCursor != "" {
args = append(args, currCursor)
}
// Build a new column `cursor` at the query time by having a fixed-sized clock value at the beginning
// concatenated with message ID. Results are sorted using this new column.
// This new column values can also be returned as a cursor for subsequent requests.
where := fmt.Sprintf(`
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WHERE
NOT(m1.hide) AND m1.local_chat_id IN %s %s
ORDER BY cursor DESC
LIMIT ?
`, "(?"+strings.Repeat(",?", len(chatIDs)-1)+")", cursorWhere)
query := db.buildMessagesQueryWithAdditionalFields(cursorField, where)
rows, err := db.db.Query(
query,
2020-11-03 10:16:05 +00:00
append(args, limit+1)..., // take one more to figure our whether a cursor should be returned
)
if err != nil {
return nil, "", err
}
defer rows.Close()
result, cursors, err := getMessagesAndCursorsFromScanRows(db, rows)
if err != nil {
return nil, "", err
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}
var newCursor string
if len(result) > limit {
newCursor = cursors[limit]
result = result[:limit]
}
return result, newCursor, nil
}
func (db sqlitePersistence) OldestMessageWhisperTimestampByChatID(chatID string) (timestamp uint64, hasAnyMessage bool, err error) {
var whisperTimestamp uint64
err = db.db.QueryRow(
`
SELECT
whisper_timestamp
FROM
user_messages m1
WHERE
m1.local_chat_id = ?
ORDER BY substr('0000000000000000000000000000000000000000000000000000000000000000' || m1.clock_value, -64, 64) || m1.id ASC
LIMIT 1
`, chatID).Scan(&whisperTimestamp)
if err == sql.ErrNoRows {
return 0, false, nil
}
if err != nil {
return 0, false, err
}
return whisperTimestamp, true, nil
}
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// EmojiReactionsByChatID returns the emoji reactions for the queried messages, up to a maximum of 100, as it's a potentially unbound number.
// NOTE: This is not completely accurate, as the messages in the database might have change since the last call to `MessageByChatID`.
func (db sqlitePersistence) EmojiReactionsByChatID(chatID string, currCursor string, limit int) ([]*EmojiReaction, error) {
cursorWhere := ""
if currCursor != "" {
cursorWhere = fmt.Sprintf("AND %s <= ?", cursor) //nolint: goconst
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}
args := []interface{}{chatID, chatID}
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if currCursor != "" {
args = append(args, currCursor)
}
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args = append(args, limit)
// NOTE: We match against local_chat_id for security reasons.
// As a user could potentially send an emoji reaction for a one to
// one/group chat that has no access to.
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// We also limit the number of emoji to a reasonable number (1000)
// for now, as we don't want the client to choke on this.
// The issue is that your own emoji might not be returned in such cases,
// allowing the user to react to a post multiple times.
// Jakubgs: Returning the whole list seems like a real overkill.
// This will get very heavy in threads that have loads of reactions on loads of messages.
// A more sensible response would just include a count and a bool telling you if you are in the list.
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// nolint: gosec
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query := fmt.Sprintf(`
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SELECT
e.clock_value,
e.source,
e.emoji_id,
e.message_id,
e.chat_id,
e.local_chat_id,
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e.retracted
FROM
emoji_reactions e
WHERE NOT(e.retracted)
AND
e.local_chat_id = ?
AND
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e.message_id IN
(SELECT id FROM user_messages m1 WHERE NOT(m1.hide) AND m1.local_chat_id = ? %s
ORDER BY %s DESC LIMIT ?)
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LIMIT 1000
`, cursorWhere, cursor)
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rows, err := db.db.Query(
query,
args...,
)
if err != nil {
return nil, err
}
defer rows.Close()
var result []*EmojiReaction
for rows.Next() {
emojiReaction := NewEmojiReaction()
err := rows.Scan(&emojiReaction.Clock,
&emojiReaction.From,
&emojiReaction.Type,
&emojiReaction.MessageId,
&emojiReaction.ChatId,
&emojiReaction.LocalChatID,
&emojiReaction.Retracted)
if err != nil {
return nil, err
}
result = append(result, emojiReaction)
}
return result, nil
}
// EmojiReactionsByChatIDMessageID returns the emoji reactions for the queried message.
func (db sqlitePersistence) EmojiReactionsByChatIDMessageID(chatID string, messageID string) ([]*EmojiReaction, error) {
args := []interface{}{chatID, messageID}
query := `SELECT
e.clock_value,
e.source,
e.emoji_id,
e.message_id,
e.chat_id,
e.local_chat_id,
e.retracted
FROM
emoji_reactions e
WHERE NOT(e.retracted)
AND
e.local_chat_id = ?
AND
e.message_id = ?
LIMIT 1000`
rows, err := db.db.Query(
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query,
args...,
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)
if err != nil {
return nil, err
}
defer rows.Close()
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var result []*EmojiReaction
for rows.Next() {
emojiReaction := NewEmojiReaction()
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err := rows.Scan(&emojiReaction.Clock,
&emojiReaction.From,
&emojiReaction.Type,
&emojiReaction.MessageId,
&emojiReaction.ChatId,
&emojiReaction.LocalChatID,
&emojiReaction.Retracted)
if err != nil {
return nil, err
}
result = append(result, emojiReaction)
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}
return result, nil
}
// EmojiReactionsByChatIDs returns the emoji reactions for the queried messages, up to a maximum of 100, as it's a potentially unbound number.
// NOTE: This is not completely accurate, as the messages in the database might have change since the last call to `MessageByChatID`.
func (db sqlitePersistence) EmojiReactionsByChatIDs(chatIDs []string, currCursor string, limit int) ([]*EmojiReaction, error) {
cursorWhere := ""
if currCursor != "" {
cursorWhere = fmt.Sprintf("AND %s <= ?", cursor) //nolint: goconst
2020-11-16 11:54:39 +00:00
}
chatsLen := len(chatIDs)
args := make([]interface{}, chatsLen*2)
for i, v := range chatIDs {
args[i] = v
}
for i, v := range chatIDs {
args[chatsLen+i] = v
}
if currCursor != "" {
args = append(args, currCursor)
}
args = append(args, limit)
// NOTE: We match against local_chat_id for security reasons.
// As a user could potentially send an emoji reaction for a one to
// one/group chat that has no access to.
// We also limit the number of emoji to a reasonable number (1000)
// for now, as we don't want the client to choke on this.
// The issue is that your own emoji might not be returned in such cases,
// allowing the user to react to a post multiple times.
// Jakubgs: Returning the whole list seems like a real overkill.
// This will get very heavy in threads that have loads of reactions on loads of messages.
// A more sensible response would just include a count and a bool telling you if you are in the list.
// nolint: gosec
query := fmt.Sprintf(`
SELECT
e.clock_value,
e.source,
e.emoji_id,
e.message_id,
e.chat_id,
e.local_chat_id,
e.retracted
FROM
emoji_reactions e
WHERE NOT(e.retracted)
AND
e.local_chat_id IN %s
AND
e.message_id IN
(SELECT id FROM user_messages m WHERE NOT(m.hide) AND m.local_chat_id IN %s %s
ORDER BY %s DESC LIMIT ?)
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LIMIT 1000
`, "(?"+strings.Repeat(",?", chatsLen-1)+")", "(?"+strings.Repeat(",?", chatsLen-1)+")", cursorWhere, cursor)
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rows, err := db.db.Query(
query,
args...,
)
if err != nil {
return nil, err
}
defer rows.Close()
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var result []*EmojiReaction
for rows.Next() {
emojiReaction := NewEmojiReaction()
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err := rows.Scan(&emojiReaction.Clock,
&emojiReaction.From,
&emojiReaction.Type,
&emojiReaction.MessageId,
&emojiReaction.ChatId,
&emojiReaction.LocalChatID,
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&emojiReaction.Retracted)
if err != nil {
return nil, err
}
result = append(result, emojiReaction)
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}
return result, nil
}
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func (db sqlitePersistence) SaveMessages(messages []*common.Message) (err error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
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if err != nil {
return
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}
defer func() {
if err == nil {
err = tx.Commit()
return
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}
// don't shadow original error
_ = tx.Rollback()
}()
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allFields := db.tableUserMessagesAllFields()
valuesVector := strings.Repeat("?, ", db.tableUserMessagesAllFieldsCount()-1) + "?"
query := "INSERT INTO user_messages(" + allFields + ") VALUES (" + valuesVector + ")" // nolint: gosec
stmt, err := tx.Prepare(query)
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if err != nil {
return
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}
for _, msg := range messages {
var allValues []interface{}
allValues, err = db.tableUserMessagesAllValues(msg)
if err != nil {
return
}
_, err = stmt.Exec(allValues...)
if err != nil {
return
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}
if msg.ContentType == protobuf.ChatMessage_BRIDGE_MESSAGE {
err = db.saveBridgeMessage(tx, msg.GetBridgeMessage(), msg.ID)
if err != nil {
return
}
// handle replies
err = db.findAndUpdateReplies(tx, msg.GetBridgeMessage().MessageID, msg.ID)
if err != nil {
return
}
parentMessageID := msg.GetBridgeMessage().ParentMessageID
if parentMessageID != "" {
err = db.findAndUpdateRepliedTo(tx, parentMessageID, msg.ID)
if err != nil {
return
}
}
}
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}
return
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}
type insertPinMessagesQueries struct {
selectStmt string
insertStmt *sql.Stmt
updateStmt *sql.Stmt
transaction *sql.Tx
}
func (db sqlitePersistence) buildPinMessageQueries() (*insertPinMessagesQueries, error) {
tx, err := db.db.BeginTx(context.Background(), nil)
if err != nil {
return nil, err
}
queries := &insertPinMessagesQueries{}
// select
queries.selectStmt = "SELECT clock_value FROM pin_messages WHERE id = ?"
// insert
allInsertFields := `id, message_id, whisper_timestamp, chat_id, local_chat_id, clock_value, pinned, pinned_by`
insertValues := strings.Repeat("?, ", strings.Count(allInsertFields, ",")) + "?"
insertQuery := "INSERT INTO pin_messages(" + allInsertFields + ") VALUES (" + insertValues + ")" // nolint: gosec
insertStmt, err := tx.Prepare(insertQuery)
if err != nil {
return nil, err
}
queries.insertStmt = insertStmt
// update
updateQuery := "UPDATE pin_messages SET pinned = ?, clock_value = ?, pinned_by = ? WHERE id = ?"
updateStmt, err := tx.Prepare(updateQuery)
if err != nil {
return nil, err
}
queries.updateStmt = updateStmt
queries.transaction = tx
return queries, nil
}
func (db sqlitePersistence) SavePinMessages(messages []*common.PinMessage) (err error) {
queries, err := db.buildPinMessageQueries()
if err != nil {
return
}
defer func() {
if err == nil {
err = queries.transaction.Commit()
return
}
// don't shadow original error
_ = queries.transaction.Rollback()
}()
for _, message := range messages {
_, err = db.savePinMessage(message, queries)
if err != nil {
return
}
}
return
}
func (db sqlitePersistence) savePinMessage(message *common.PinMessage, queries *insertPinMessagesQueries) (inserted bool, err error) {
tx := queries.transaction
selectQuery := queries.selectStmt
updateStmt := queries.updateStmt
insertStmt := queries.insertStmt
row := tx.QueryRow(selectQuery, message.ID)
var existingClock uint64
switch err = row.Scan(&existingClock); err {
case sql.ErrNoRows:
// not found, insert new record
allValues := []interface{}{
message.ID,
message.MessageId,
message.WhisperTimestamp,
message.ChatId,
message.LocalChatID,
message.Clock,
message.Pinned,
message.From,
}
_, err = insertStmt.Exec(allValues...)
if err != nil {
return
}
inserted = true
case nil:
// found, update if current message is more recent, otherwise skip
if existingClock < message.Clock {
// update
_, err = updateStmt.Exec(message.Pinned, message.Clock, message.From, message.ID)
if err != nil {
return
}
inserted = true
}
default:
return
}
return
}
func (db sqlitePersistence) SavePinMessage(message *common.PinMessage) (inserted bool, err error) {
queries, err := db.buildPinMessageQueries()
if err != nil {
return
}
defer func() {
if err == nil {
err = queries.transaction.Commit()
return
}
// don't shadow original error
_ = queries.transaction.Rollback()
}()
return db.savePinMessage(message, queries)
}
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func (db sqlitePersistence) DeleteMessage(id string) error {
_, err := db.db.Exec(`DELETE FROM user_messages WHERE id = ?`, id)
return err
}
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func (db sqlitePersistence) DeleteMessages(ids []string) error {
idsArgs := make([]interface{}, 0, len(ids))
for _, id := range ids {
idsArgs = append(idsArgs, id)
}
inVector := strings.Repeat("?, ", len(ids)-1) + "?"
_, err := db.db.Exec("DELETE FROM user_messages WHERE id IN ("+inVector+")", idsArgs...) // nolint: gosec
return err
}
func (db sqlitePersistence) HideMessage(id string) error {
_, err := db.db.Exec(`UPDATE user_messages SET hide = 1, seen = 1 WHERE id = ?`, id)
2019-08-06 21:50:13 +00:00
return err
}
2021-08-20 14:26:13 +00:00
// SetHideOnMessage set the hide flag, but not the seen flag, as it's needed by the client to understand whether the count should be updated
func (db sqlitePersistence) SetHideOnMessage(id string) error {
_, err := db.db.Exec(`UPDATE user_messages SET hide = 1 WHERE id = ?`, id)
return err
}
2022-09-29 11:50:23 +00:00
func (db sqlitePersistence) DeleteMessagesByCommunityID(id string) error {
return db.deleteMessagesByCommunityID(id)
}
func (db sqlitePersistence) deleteMessagesByCommunityID(id string) (err error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
_, err = tx.Exec(`DELETE FROM user_messages WHERE community_id = ?`, id)
if err != nil {
return
}
_, err = tx.Exec(`DELETE FROM pin_messages WHERE community_id = ?`, id)
return
}
func (db sqlitePersistence) DeleteMessagesByChatID(id string) error {
return db.deleteMessagesByChatID(id, nil)
}
func (db sqlitePersistence) deleteMessagesByChatID(id string, tx *sql.Tx) (err error) {
if tx == nil {
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
}
_, err = tx.Exec(`DELETE FROM user_messages WHERE local_chat_id = ?`, id)
if err != nil {
return
}
_, err = tx.Exec(`DELETE FROM pin_messages WHERE local_chat_id = ?`, id)
return
}
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func (db sqlitePersistence) deleteMessagesByChatIDAndClockValueLessThanOrEqual(id string, clock uint64, tx *sql.Tx) (unViewedMessages, unViewedMentions uint, err error) {
if tx == nil {
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return 0, 0, err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
}
_, err = tx.Exec(`DELETE FROM user_messages WHERE local_chat_id = ? AND clock_value <= ?`, id, clock)
if err != nil {
return
}
_, err = tx.Exec(`DELETE FROM pin_messages WHERE local_chat_id = ? AND clock_value <= ?`, id, clock)
if err != nil {
return
}
_, err = tx.Exec(
`UPDATE chats
SET unviewed_message_count =
(SELECT COUNT(1)
FROM user_messages
WHERE local_chat_id = ? AND seen = 0),
unviewed_mentions_count =
(SELECT COUNT(1)
FROM user_messages
WHERE local_chat_id = ? AND seen = 0 AND (mentioned OR replied)),
2022-02-10 10:00:59 +00:00
highlight = 0
WHERE id = ?`, id, id, id)
if err != nil {
return 0, 0, err
}
err = tx.QueryRow(`SELECT unviewed_message_count, unviewed_mentions_count FROM chats
2022-02-10 10:00:59 +00:00
WHERE id = ?`, id).Scan(&unViewedMessages, &unViewedMentions)
return
}
2021-10-12 10:33:32 +00:00
func (db sqlitePersistence) MarkAllRead(chatID string, clock uint64) (int64, int64, error) {
2020-02-26 12:31:48 +00:00
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
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return 0, 0, err
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}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
seenResult, err := tx.Exec(`UPDATE user_messages SET seen = 1 WHERE local_chat_id = ? AND seen = 0 AND clock_value <= ? AND not(mentioned) AND not(replied)`, chatID, clock)
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if err != nil {
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return 0, 0, err
2020-02-26 12:31:48 +00:00
}
2021-10-12 10:33:32 +00:00
seen, err := seenResult.RowsAffected()
if err != nil {
return 0, 0, err
}
mentionedOrRepliedResult, err := tx.Exec(`UPDATE user_messages SET seen = 1 WHERE local_chat_id = ? AND seen = 0 AND clock_value <= ? AND (mentioned OR replied)`, chatID, clock)
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if err != nil {
return 0, 0, err
}
mentionedOrReplied, err := mentionedOrRepliedResult.RowsAffected()
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if err != nil {
return 0, 0, err
}
_, err = tx.Exec(
`UPDATE chats
SET unviewed_message_count = 0,
unviewed_mentions_count = 0,
2021-10-12 10:33:32 +00:00
highlight = 0
WHERE id = ?`, chatID, chatID, chatID)
if err != nil {
return 0, 0, err
}
return (seen + mentionedOrReplied), mentionedOrReplied, nil
2020-02-26 12:31:48 +00:00
}
func (db sqlitePersistence) MarkAllReadMultiple(chatIDs []string) error {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
idsArgs := make([]interface{}, 0, len(chatIDs))
for _, id := range chatIDs {
idsArgs = append(idsArgs, id)
}
inVector := strings.Repeat("?, ", len(chatIDs)-1) + "?"
q := "UPDATE user_messages SET seen = 1 WHERE local_chat_id IN (%s) AND seen != 1"
q = fmt.Sprintf(q, inVector)
_, err = tx.Exec(q, idsArgs...)
if err != nil {
return err
}
q = "UPDATE chats SET unviewed_mentions_count = 0, unviewed_message_count = 0, highlight = 0 WHERE id IN (%s)"
q = fmt.Sprintf(q, inVector)
_, err = tx.Exec(q, idsArgs...)
return err
}
func (db sqlitePersistence) MarkMessagesSeen(chatID string, ids []string) (uint64, uint64, error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return 0, 0, err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
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idsArgs := make([]interface{}, 0, len(ids))
for _, id := range ids {
idsArgs = append(idsArgs, id)
}
inVector := strings.Repeat("?, ", len(ids)-1) + "?"
q := "UPDATE user_messages SET seen = 1 WHERE NOT(seen) AND (mentioned OR replied) AND id IN (" + inVector + ")" // nolint: gosec
_, err = tx.Exec(q, idsArgs...)
if err != nil {
return 0, 0, err
}
var countWithMentions uint64
row := tx.QueryRow("SELECT changes();")
if err := row.Scan(&countWithMentions); err != nil {
return 0, 0, err
}
q = "UPDATE user_messages SET seen = 1 WHERE NOT(seen) AND NOT(mentioned) AND NOT(replied) AND id IN (" + inVector + ")" // nolint: gosec
_, err = tx.Exec(q, idsArgs...)
if err != nil {
return 0, 0, err
}
var countNoMentions uint64
row = tx.QueryRow("SELECT changes();")
if err := row.Scan(&countNoMentions); err != nil {
return 0, 0, err
}
// Update denormalized count
_, err = tx.Exec(
`UPDATE chats
SET unviewed_message_count =
(SELECT COUNT(1)
FROM user_messages
WHERE local_chat_id = ? AND seen = 0),
unviewed_mentions_count =
(SELECT COUNT(1)
FROM user_messages
WHERE local_chat_id = ? AND seen = 0 AND (mentioned OR replied)),
highlight = 0
WHERE id = ?`, chatID, chatID, chatID)
return countWithMentions + countNoMentions, countWithMentions, err
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}
func (db sqlitePersistence) GetMessageIdsWithGreaterTimestamp(chatID string, messageID string) ([]string, error) {
var err error
var rows *sql.Rows
query := "SELECT id FROM user_messages WHERE local_chat_id = ? AND timestamp >= (SELECT timestamp FROM user_messages WHERE id = ?)"
rows, err = db.db.Query(query, chatID, messageID)
if err != nil {
return nil, err
}
defer rows.Close()
var ids []string
for rows.Next() {
var messageID string
err = rows.Scan(&messageID)
if err != nil {
return nil, err
}
ids = append(ids, messageID)
}
return ids, nil
}
func (db sqlitePersistence) MarkMessageAsUnread(chatID string, messageID string) (uint64, uint64, error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return 0, 0, err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
// TODO : Reduce number of queries for getting (total unread messages, total messages with mention)
// The function expected result is a pair (total unread messages, total messages with mention)
// Currently a 2 step operation is needed to obtain this pair
_, err = tx.Exec(`UPDATE user_messages SET seen = 1 WHERE local_chat_id = ? AND NOT(seen)`, chatID)
if err != nil {
return 0, 0, err
}
_, err = tx.Exec(
`UPDATE user_messages
SET seen = 0
WHERE local_chat_id = ?
AND seen = 1
AND (mentioned OR replied)
AND timestamp >= (SELECT timestamp FROM user_messages WHERE id = ?)`, chatID, messageID)
if err != nil {
return 0, 0, err
}
var countWithMentions uint64
row := tx.QueryRow("SELECT changes();")
if err := row.Scan(&countWithMentions); err != nil {
return 0, 0, err
}
_, err = tx.Exec(
`UPDATE user_messages
SET seen = 0
WHERE local_chat_id = ?
AND seen = 1
AND NOT(mentioned OR replied)
AND timestamp >= (SELECT timestamp FROM user_messages WHERE id = ?)`, chatID, messageID)
if err != nil {
return 0, 0, err
}
var countNoMentions uint64
row = tx.QueryRow("SELECT changes();")
if err := row.Scan(&countNoMentions); err != nil {
return 0, 0, err
}
count := countWithMentions + countNoMentions
_, err = tx.Exec(
`UPDATE chats
SET unviewed_message_count = ?, unviewed_mentions_count = ?,
highlight = 0
WHERE id = ?`, count, countWithMentions, chatID)
return count, countWithMentions, err
}
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func (db sqlitePersistence) UpdateMessageOutgoingStatus(id string, newOutgoingStatus string) error {
_, err := db.db.Exec(`
UPDATE user_messages
2019-08-06 21:50:13 +00:00
SET outgoing_status = ?
WHERE id = ? AND outgoing_status != ?
`, newOutgoingStatus, id, common.OutgoingStatusDelivered)
2019-08-06 21:50:13 +00:00
return err
}
// BlockContact updates a contact, deletes all the messages and 1-to-1 chat, updates the unread messages count and returns a map with the new count
func (db sqlitePersistence) BlockContact(contact *Contact, isDesktopFunc bool) ([]*Chat, error) {
var chats []*Chat
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return nil, err
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
if !isDesktopFunc {
// Delete messages
_, err = tx.Exec(
`DELETE
FROM user_messages
WHERE source = ?`,
contact.ID,
)
if err != nil {
return nil, err
}
}
// Update contact
err = db.SaveContact(contact, tx)
if err != nil {
return nil, err
}
if !isDesktopFunc {
// Delete one-to-one chat
_, err = tx.Exec("DELETE FROM chats WHERE id = ?", contact.ID)
if err != nil {
return nil, err
}
}
// Recalculate denormalized fields
_, err = tx.Exec(`
UPDATE chats
SET
unviewed_message_count = (SELECT COUNT(1) FROM user_messages WHERE seen = 0 AND local_chat_id = chats.id),
unviewed_mentions_count = (SELECT COUNT(1) FROM user_messages WHERE seen = 0 AND local_chat_id = chats.id AND (mentioned OR replied))`)
if err != nil {
return nil, err
}
// return the updated chats
chats, err = db.chats(tx)
if err != nil {
return nil, err
}
for _, c := range chats {
var lastMessageID string
row := tx.QueryRow(`SELECT id FROM user_messages WHERE local_chat_id = ? ORDER BY clock_value DESC LIMIT 1`, c.ID)
switch err := row.Scan(&lastMessageID); err {
case nil:
message, err := db.messageByID(tx, lastMessageID)
if err != nil {
return nil, err
}
if message != nil {
encodedMessage, err := json.Marshal(message)
if err != nil {
return nil, err
}
_, err = tx.Exec(`UPDATE chats SET last_message = ? WHERE id = ?`, encodedMessage, c.ID)
if err != nil {
return nil, err
}
c.LastMessage = message
}
case sql.ErrNoRows:
// Reset LastMessage
_, err = tx.Exec(`UPDATE chats SET last_message = NULL WHERE id = ?`, c.ID)
if err != nil {
return nil, err
}
c.LastMessage = nil
default:
return nil, err
}
}
return chats, err
}
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func (db sqlitePersistence) HasDiscordMessageAuthor(id string) (exists bool, err error) {
err = db.db.QueryRow(`SELECT EXISTS(SELECT 1 FROM discord_message_authors WHERE id = ?)`, id).Scan(&exists)
return exists, err
}
func (db sqlitePersistence) HasDiscordMessageAuthorImagePayload(id string) (hasPayload bool, err error) {
err = db.db.QueryRow(`SELECT EXISTS(SELECT 1 FROM discord_message_authors WHERE id = ? AND avatar_image_payload NOT NULL)`, id).Scan(&hasPayload)
return hasPayload, err
}
func (db sqlitePersistence) SaveDiscordMessageAuthor(author *protobuf.DiscordMessageAuthor) (err error) {
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stmt, err := db.db.Prepare(basicInsertDiscordMessageAuthorQuery)
if err != nil {
return
}
_, err = stmt.Exec(
author.GetId(),
author.GetName(),
author.GetDiscriminator(),
author.GetNickname(),
author.GetAvatarUrl(),
author.GetAvatarImagePayload(),
)
return
}
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func (db sqlitePersistence) SaveDiscordMessageAuthors(authors []*protobuf.DiscordMessageAuthor) (err error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
stmt, err := tx.Prepare(basicInsertDiscordMessageAuthorQuery)
if err != nil {
return
}
defer stmt.Close()
for _, author := range authors {
_, err = stmt.Exec(
author.GetId(),
author.GetName(),
author.GetDiscriminator(),
author.GetNickname(),
author.GetAvatarUrl(),
author.GetAvatarImagePayload(),
)
if err != nil {
return
}
}
return
}
func (db sqlitePersistence) UpdateDiscordMessageAuthorImage(authorID string, payload []byte) (err error) {
query := "UPDATE discord_message_authors SET avatar_image_payload = ? WHERE id = ?"
stmt, err := db.db.Prepare(query)
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(payload, authorID)
return
}
func (db sqlitePersistence) GetDiscordMessageAuthorImagePayloadByID(id string) ([]byte, error) {
payload := make([]byte, 0)
row := db.db.QueryRow("SELECT avatar_image_payload FROM discord_message_authors WHERE id = ?", id)
err := row.Scan(&payload)
return payload, err
}
func (db sqlitePersistence) GetDiscordMessageAuthorByID(id string) (*protobuf.DiscordMessageAuthor, error) {
author := &protobuf.DiscordMessageAuthor{}
row := db.db.QueryRow("SELECT id, name, discriminator, nickname, avatar_url FROM discord_message_authors WHERE id = ?", id)
err := row.Scan(
&author.Id,
&author.Name,
&author.Discriminator,
&author.Nickname,
&author.AvatarUrl)
return author, err
}
func (db sqlitePersistence) SaveDiscordMessage(message *protobuf.DiscordMessage) (err error) {
query := "INSERT OR REPLACE INTO discord_messages(id,type,timestamp,timestamp_edited,content,author_id, reference_message_id, reference_channel_id, reference_guild_id) VALUES (?,?,?,?,?,?,?,?,?)"
stmt, err := db.db.Prepare(query)
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(
message.GetId(),
message.GetType(),
message.GetTimestamp(),
message.GetTimestampEdited(),
message.GetContent(),
message.Author.GetId(),
message.Reference.GetMessageId(),
message.Reference.GetChannelId(),
message.Reference.GetGuildId(),
)
return
}
func (db sqlitePersistence) SaveDiscordMessages(messages []*protobuf.DiscordMessage) (err error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
query := "INSERT OR REPLACE INTO discord_messages(id, author_id, type, timestamp, timestamp_edited, content, reference_message_id, reference_channel_id, reference_guild_id) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?)"
stmt, err := tx.Prepare(query)
if err != nil {
return
}
defer stmt.Close()
for _, msg := range messages {
_, err = stmt.Exec(
msg.GetId(),
msg.Author.GetId(),
msg.GetType(),
msg.GetTimestamp(),
msg.GetTimestampEdited(),
msg.GetContent(),
msg.Reference.GetMessageId(),
msg.Reference.GetChannelId(),
msg.Reference.GetGuildId(),
)
if err != nil {
return
}
}
return
}
func (db sqlitePersistence) HasDiscordMessageAttachmentPayload(id string, messageID string) (hasPayload bool, err error) {
err = db.db.QueryRow(`SELECT EXISTS(SELECT 1 FROM discord_message_attachments WHERE id = ? AND discord_message_id = ? AND payload NOT NULL)`, id, messageID).Scan(&hasPayload)
return hasPayload, err
}
func (db sqlitePersistence) SaveDiscordMessageAttachments(attachments []*protobuf.DiscordMessageAttachment) (err error) {
tx, err := db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
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stmt, err := tx.Prepare("INSERT OR REPLACE INTO discord_message_attachments(id,discord_message_id,url,file_name,file_size_bytes,payload, content_type) VALUES (?,?,?,?,?,?,?)")
if err != nil {
return
}
defer stmt.Close()
if err != nil {
return
}
for _, attachment := range attachments {
_, err = stmt.Exec(
attachment.GetId(),
attachment.GetMessageId(),
attachment.GetUrl(),
attachment.GetFileName(),
attachment.GetFileSizeBytes(),
attachment.GetPayload(),
attachment.GetContentType(),
)
if err != nil {
return
}
}
return
}
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func (db sqlitePersistence) SaveEmojiReaction(emojiReaction *EmojiReaction) (err error) {
query := "INSERT INTO emoji_reactions(id,clock_value,source,emoji_id,message_id,chat_id,local_chat_id,retracted) VALUES (?,?,?,?,?,?,?,?)"
stmt, err := db.db.Prepare(query)
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if err != nil {
return
}
_, err = stmt.Exec(
emojiReaction.ID(),
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emojiReaction.Clock,
emojiReaction.From,
emojiReaction.Type,
emojiReaction.MessageId,
emojiReaction.ChatId,
emojiReaction.LocalChatID,
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emojiReaction.Retracted,
)
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return
}
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func (db sqlitePersistence) EmojiReactionByID(id string) (*EmojiReaction, error) {
row := db.db.QueryRow(
`SELECT
clock_value,
source,
emoji_id,
message_id,
chat_id,
local_chat_id,
retracted
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FROM
emoji_reactions
WHERE
emoji_reactions.id = ?
`, id)
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emojiReaction := NewEmojiReaction()
err := row.Scan(&emojiReaction.Clock,
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&emojiReaction.From,
&emojiReaction.Type,
&emojiReaction.MessageId,
&emojiReaction.ChatId,
&emojiReaction.LocalChatID,
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&emojiReaction.Retracted,
)
switch err {
case sql.ErrNoRows:
return nil, common.ErrRecordNotFound
case nil:
return emojiReaction, nil
default:
return nil, err
}
}
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func (db sqlitePersistence) SaveInvitation(invitation *GroupChatInvitation) (err error) {
query := "INSERT INTO group_chat_invitations(id,source,chat_id,message,state,clock) VALUES (?,?,?,?,?,?)"
stmt, err := db.db.Prepare(query)
if err != nil {
return
}
_, err = stmt.Exec(
invitation.ID(),
invitation.From,
invitation.ChatId,
invitation.IntroductionMessage,
invitation.State,
invitation.Clock,
)
return
}
func (db sqlitePersistence) GetGroupChatInvitations() (rst []*GroupChatInvitation, err error) {
tx, err := db.db.Begin()
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
_ = tx.Rollback()
}()
bRows, err := tx.Query(`SELECT
source,
chat_id,
message,
state,
clock
FROM
group_chat_invitations`)
if err != nil {
return
}
defer bRows.Close()
for bRows.Next() {
invitation := GroupChatInvitation{}
err = bRows.Scan(
&invitation.From,
&invitation.ChatId,
&invitation.IntroductionMessage,
&invitation.State,
&invitation.Clock)
if err != nil {
return nil, err
}
rst = append(rst, &invitation)
}
return rst, nil
}
func (db sqlitePersistence) InvitationByID(id string) (*GroupChatInvitation, error) {
row := db.db.QueryRow(
`SELECT
source,
chat_id,
message,
state,
clock
FROM
group_chat_invitations
WHERE
group_chat_invitations.id = ?
`, id)
chatInvitations := NewGroupChatInvitation()
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err := row.Scan(&chatInvitations.From,
&chatInvitations.ChatId,
&chatInvitations.IntroductionMessage,
&chatInvitations.State,
&chatInvitations.Clock,
)
switch err {
case sql.ErrNoRows:
return nil, common.ErrRecordNotFound
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case nil:
return chatInvitations, nil
default:
return nil, err
}
}
// ClearHistory deletes all the messages for a chat and updates it's values
func (db sqlitePersistence) ClearHistory(chat *Chat, currentClockValue uint64) (err error) {
var tx *sql.Tx
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
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err = db.clearHistory(chat, currentClockValue, tx, false)
return
}
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func (db sqlitePersistence) ClearHistoryFromSyncMessage(chat *Chat, currentClockValue uint64) (err error) {
var tx *sql.Tx
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
err = db.clearHistoryFromSyncMessage(chat, currentClockValue, tx)
return
}
// Deactivate chat sets a chat as inactive and clear its history
func (db sqlitePersistence) DeactivateChat(chat *Chat, currentClockValue uint64, doClearHistory bool) (err error) {
var tx *sql.Tx
tx, err = db.db.BeginTx(context.Background(), &sql.TxOptions{})
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
return
}
// don't shadow original error
_ = tx.Rollback()
}()
err = db.deactivateChat(chat, currentClockValue, tx, doClearHistory)
return
}
func (db sqlitePersistence) deactivateChat(chat *Chat, currentClockValue uint64, tx *sql.Tx, doClearHistory bool) error {
chat.Active = false
err := db.saveChat(tx, *chat)
if err != nil {
return err
}
if !doClearHistory {
return nil
}
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return db.clearHistory(chat, currentClockValue, tx, true)
}
func (db sqlitePersistence) SaveDelete(deleteMessage *DeleteMessage) error {
_, err := db.db.Exec(`INSERT INTO user_messages_deletes (clock, chat_id, message_id, source, id) VALUES(?,?,?,?,?)`, deleteMessage.Clock, deleteMessage.ChatId, deleteMessage.MessageId, deleteMessage.From, deleteMessage.ID)
return err
}
func (db sqlitePersistence) GetDeletes(messageID string, from string) ([]*DeleteMessage, error) {
rows, err := db.db.Query(`SELECT clock, chat_id, message_id, source, id FROM user_messages_deletes WHERE message_id = ? AND source = ? ORDER BY CLOCK DESC`, messageID, from)
if err != nil {
return nil, err
}
defer rows.Close()
var messages []*DeleteMessage
for rows.Next() {
d := NewDeleteMessage()
err := rows.Scan(&d.Clock, &d.ChatId, &d.MessageId, &d.From, &d.ID)
if err != nil {
return nil, err
}
messages = append(messages, d)
}
return messages, nil
}
func (db sqlitePersistence) SaveOrUpdateDeleteForMeMessage(deleteForMeMessage *protobuf.SyncDeleteForMeMessage) error {
_, err := db.db.Exec(`INSERT OR REPLACE INTO user_messages_deleted_for_mes (clock, message_id)
SELECT ?,? WHERE NOT EXISTS (SELECT 1 FROM user_messages_deleted_for_mes WHERE message_id = ? AND clock >= ?)`,
deleteForMeMessage.Clock, deleteForMeMessage.MessageId, deleteForMeMessage.MessageId, deleteForMeMessage.Clock)
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return err
}
func (db sqlitePersistence) GetDeleteForMeMessagesByMessageID(messageID string) ([]*protobuf.SyncDeleteForMeMessage, error) {
rows, err := db.db.Query(`SELECT clock, message_id FROM user_messages_deleted_for_mes WHERE message_id = ?`, messageID)
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if err != nil {
return nil, err
}
defer rows.Close()
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var messages []*protobuf.SyncDeleteForMeMessage
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for rows.Next() {
d := &protobuf.SyncDeleteForMeMessage{}
err := rows.Scan(&d.Clock, &d.MessageId)
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if err != nil {
return nil, err
}
messages = append(messages, d)
}
return messages, nil
}
func (db sqlitePersistence) GetDeleteForMeMessages() ([]*protobuf.SyncDeleteForMeMessage, error) {
rows, err := db.db.Query(`SELECT clock, message_id FROM user_messages_deleted_for_mes`)
if err != nil {
return nil, err
}
defer rows.Close()
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var messages []*protobuf.SyncDeleteForMeMessage
for rows.Next() {
d := &protobuf.SyncDeleteForMeMessage{}
err := rows.Scan(&d.Clock, &d.MessageId)
if err != nil {
return nil, err
}
messages = append(messages, d)
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}
return messages, nil
}
func (db sqlitePersistence) SaveEdit(editMessage *EditMessage) error {
if editMessage == nil {
return nil
}
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_, err := db.db.Exec(`INSERT INTO user_messages_edits (clock, chat_id, message_id, text, source, id, unfurled_links, unfurled_status_links) VALUES(?,?,?,?,?,?,?,?)`, editMessage.Clock, editMessage.ChatId, editMessage.MessageId, editMessage.Text, editMessage.From, editMessage.ID, pq.Array(editMessage.UnfurledLinks), editMessage.UnfurledStatusLinks)
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return err
}
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func (db sqlitePersistence) GetEdits(messageID string, from string) ([]*EditMessage, error) {
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rows, err := db.db.Query(`SELECT clock, chat_id, message_id, source, text, id, unfurled_links, unfurled_status_links FROM user_messages_edits WHERE message_id = ? AND source = ? ORDER BY CLOCK DESC`, messageID, from)
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if err != nil {
return nil, err
}
defer rows.Close()
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var messages []*EditMessage
for rows.Next() {
e := NewEditMessage()
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err := rows.Scan(&e.Clock, &e.ChatId, &e.MessageId, &e.From, &e.Text, &e.ID, pq.Array(&e.UnfurledLinks), &e.UnfurledStatusLinks)
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if err != nil {
return nil, err
}
messages = append(messages, e)
}
return messages, nil
}
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func (db sqlitePersistence) clearHistory(chat *Chat, currentClockValue uint64, tx *sql.Tx, deactivate bool) error {
// Set deleted at clock value if it's not a public chat so that
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// old messages will be discarded, or if it's a straight clear history
if !deactivate || (!chat.Public() && !chat.ProfileUpdates() && !chat.Timeline()) {
if chat.LastMessage != nil && chat.LastMessage.Clock != 0 {
chat.DeletedAtClockValue = chat.LastMessage.Clock
}
chat.DeletedAtClockValue = currentClockValue
}
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// Reset synced-to/from
syncedTo := uint32(currentClockValue / 1000)
chat.SyncedTo = syncedTo
chat.SyncedFrom = 0
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chat.LastMessage = nil
chat.UnviewedMessagesCount = 0
chat.UnviewedMentionsCount = 0
chat.Highlight = true
err := db.deleteMessagesByChatID(chat.ID, tx)
if err != nil {
return err
}
err = db.saveChat(tx, *chat)
return err
}
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func (db sqlitePersistence) clearHistoryFromSyncMessage(chat *Chat, clearedAt uint64, tx *sql.Tx) error {
chat.DeletedAtClockValue = clearedAt
// Reset synced-to/from
syncedTo := uint32(clearedAt / 1000)
chat.SyncedTo = syncedTo
chat.SyncedFrom = 0
unViewedMessagesCount, unViewedMentionsCount, err := db.deleteMessagesByChatIDAndClockValueLessThanOrEqual(chat.ID, clearedAt, tx)
if err != nil {
return err
}
chat.UnviewedMessagesCount = unViewedMessagesCount
chat.UnviewedMentionsCount = unViewedMentionsCount
if chat.LastMessage != nil && chat.LastMessage.Clock <= clearedAt {
chat.LastMessage = nil
}
err = db.saveChat(tx, *chat)
return err
}
func (db sqlitePersistence) SetContactRequestState(id string, state common.ContactRequestState) error {
_, err := db.db.Exec(`UPDATE user_messages SET contact_request_state = ? WHERE id = ?`, state, id)
return err
}
func getUpdatedChatMessagePayload(originalMessage *protobuf.DiscordMessage, attachmentMessage *protobuf.DiscordMessage) *protobuf.ChatMessage_DiscordMessage {
originalMessage.Attachments = append(originalMessage.Attachments, attachmentMessage.Attachments...)
return &protobuf.ChatMessage_DiscordMessage{
DiscordMessage: originalMessage,
}
}
func getMessageFromScanRows(db sqlitePersistence, rows *sql.Rows) (*common.Message, error) {
var msg *common.Message
for rows.Next() {
// There's a possibility of multiple rows per message if the
// message has a discordMessage and the discordMessage has multiple
// attachments
//
// Hence, we make sure we're aggregating all attachments on a single
// common.Message
message := common.NewMessage()
err := db.tableUserMessagesScanAllFields(rows, message)
if err != nil {
return nil, err
}
if msg == nil {
msg = message
} else if discordMessage := msg.GetDiscordMessage(); discordMessage != nil {
msg.Payload = getUpdatedChatMessagePayload(discordMessage, message.GetDiscordMessage())
}
}
if msg == nil {
return nil, common.ErrRecordNotFound
}
return msg, nil
}
type HasClocks interface {
GetClock(i int) uint64
}
func SortByClock(msgs HasClocks) {
sort.Slice(msgs, func(i, j int) bool {
return msgs.GetClock(j) < msgs.GetClock(i)
})
}
func getMessagesFromScanRows(db sqlitePersistence, rows *sql.Rows, withCursor bool) ([]*common.Message, error) {
messageIdx := make(map[string]*common.Message, 0)
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var messages common.Messages
for rows.Next() {
// There's a possibility of multiple rows per message if the
// message has a discordMessage and the discordMessage has multiple
// attachments
//
// Hence, we make sure we're aggregating all attachments on a single
// common.Message
message := common.NewMessage()
if withCursor {
var cursor string
if err := db.tableUserMessagesScanAllFields(rows, message, &cursor); err != nil {
return nil, err
}
} else {
if err := db.tableUserMessagesScanAllFields(rows, message); err != nil {
return nil, err
}
}
if msg, ok := messageIdx[message.ID]; !ok {
messageIdx[message.ID] = message
messages = append(messages, message)
} else if discordMessage := msg.GetDiscordMessage(); discordMessage != nil {
msg.Payload = getUpdatedChatMessagePayload(discordMessage, message.GetDiscordMessage())
}
}
SortByClock(messages)
return messages, nil
}
func getMessagesAndCursorsFromScanRows(db sqlitePersistence, rows *sql.Rows) ([]*common.Message, []string, error) {
var cursors []string
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var messages common.Messages
messageIdx := make(map[string]*common.Message, 0)
for rows.Next() {
// There's a possibility of multiple rows per message if the
// message has a discordMessage and the discordMessage has multiple
// attachments
//
// Hence, we make sure we're aggregating all attachments on a single
// common.Message
var cursor string
message := common.NewMessage()
if err := db.tableUserMessagesScanAllFields(rows, message, &cursor); err != nil {
return nil, nil, err
}
if msg, ok := messageIdx[message.ID]; !ok {
messageIdx[message.ID] = message
cursors = append(cursors, cursor)
messages = append(messages, message)
} else if discordMessage := msg.GetDiscordMessage(); discordMessage != nil {
msg.Payload = getUpdatedChatMessagePayload(discordMessage, message.GetDiscordMessage())
}
}
SortByClock(messages)
return messages, cursors, nil
}
func getPinnedMessagesAndCursorsFromScanRows(db sqlitePersistence, rows *sql.Rows) ([]*common.PinnedMessage, []string, error) {
var cursors []string
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var messages common.PinnedMessages
messageIdx := make(map[string]*common.PinnedMessage, 0)
for rows.Next() {
var (
pinnedAt uint64
pinnedBy string
cursor string
)
message := common.NewMessage()
if err := db.tableUserMessagesScanAllFields(rows, message, &pinnedAt, &pinnedBy, &cursor); err != nil {
return nil, nil, err
}
if msg, ok := messageIdx[message.ID]; !ok {
pinnedMessage := &common.PinnedMessage{
Message: message,
PinnedAt: pinnedAt,
PinnedBy: pinnedBy,
}
messageIdx[message.ID] = pinnedMessage
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messages = append(messages, pinnedMessage)
cursors = append(cursors, cursor)
} else if discordMessage := msg.Message.GetDiscordMessage(); discordMessage != nil {
msg.Message.Payload = getUpdatedChatMessagePayload(discordMessage, message.GetDiscordMessage())
}
}
SortByClock(messages)
return messages, cursors, nil
}
func (db sqlitePersistence) saveBridgeMessage(tx *sql.Tx, message *protobuf.BridgeMessage, userMessageID string) (err error) {
query := "INSERT INTO bridge_messages(user_messages_id,bridge_name,user_name,user_avatar,user_id,content,message_id,parent_message_id) VALUES (?,?,?,?,?,?,?,?)"
stmt, err := tx.Prepare(query)
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(
userMessageID,
message.GetBridgeName(),
message.GetUserName(),
message.GetUserAvatar(),
message.GetUserID(),
message.GetContent(),
message.GetMessageID(),
message.GetParentMessageID(),
)
return
}
func (db sqlitePersistence) GetCommunityMemberAllMessagesID(member string, communityID string) ([]*DeletedMessage, error) {
rows, err := db.db.Query(`SELECT m.id, m.chat_id FROM user_messages as m
INNER JOIN chats AS ch ON ch.id = m.chat_id AND ch.community_id = ?
WHERE m.source = ?`, communityID, member)
if err != nil {
return nil, err
}
defer rows.Close()
result := []*DeletedMessage{}
for rows.Next() {
removeMsgsInfo := &DeletedMessage{}
err = rows.Scan(&removeMsgsInfo.ID, &removeMsgsInfo.ChatID)
if err != nil {
return nil, err
}
result = append(result, removeMsgsInfo)
}
return result, nil
}
// Finds status messages id which are replies for bridgeMessageID
func (db sqlitePersistence) findStatusMessageIdsReplies(tx *sql.Tx, bridgeMessageID string) ([]string, error) {
rows, err := tx.Query(`SELECT user_messages_id FROM bridge_messages WHERE parent_message_id = ?`, bridgeMessageID)
if err != nil {
return []string{}, err
}
defer rows.Close()
var statusMessageIDs []string
for rows.Next() {
var statusMessageID string
err = rows.Scan(&statusMessageID)
if err != nil {
return []string{}, err
}
statusMessageIDs = append(statusMessageIDs, statusMessageID)
}
return statusMessageIDs, nil
}
// Finds status messages id which are replies for bridgeMessageID
func (db sqlitePersistence) findStatusMessageIdsRepliedTo(tx *sql.Tx, parentMessageID string) (string, error) {
rows, err := tx.Query(`SELECT user_messages_id FROM bridge_messages WHERE message_id = ?`, parentMessageID)
if err != nil {
return "", err
}
defer rows.Close()
if rows.Next() {
var statusMessageID string
err = rows.Scan(&statusMessageID)
if err != nil {
return "", err
}
return statusMessageID, nil
}
return "", nil
}
func (db sqlitePersistence) updateStatusMessagesWithResponse(tx *sql.Tx, statusMessagesToUpdate []string, responseValue string) error {
sql := "UPDATE user_messages SET response_to = ? WHERE id IN (?" + strings.Repeat(",?", len(statusMessagesToUpdate)-1) + ")"
stmt, err := tx.Prepare(sql)
if err != nil {
return err
}
defer stmt.Close()
args := make([]interface{}, 0, len(statusMessagesToUpdate)+1)
args = append(args, responseValue)
for _, msgToUpdate := range statusMessagesToUpdate {
args = append(args, msgToUpdate)
}
_, err = stmt.Exec(args...)
return err
}
// Finds if there are any messages that are replies to that message (in case replies were received earlier)
func (db sqlitePersistence) findAndUpdateReplies(tx *sql.Tx, bridgeMessageID string, statusMessageID string) error {
replyMessageIds, err := db.findStatusMessageIdsReplies(tx, bridgeMessageID)
if err != nil {
return err
}
if len(replyMessageIds) == 0 {
return nil
}
return db.updateStatusMessagesWithResponse(tx, replyMessageIds, statusMessageID)
}
func (db sqlitePersistence) findAndUpdateRepliedTo(tx *sql.Tx, discordParentMessageID string, statusMessageID string) error {
repliedMessageID, err := db.findStatusMessageIdsRepliedTo(tx, discordParentMessageID)
if err != nil {
return err
}
if repliedMessageID == "" {
return nil
}
return db.updateStatusMessagesWithResponse(tx, []string{statusMessageID}, repliedMessageID)
}