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<title data-rh="true">71/STATUS-PUSH-NOTIFICATION-SERVER | Vac Research</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://vac.dev/status/71/push-notification-server"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="image" content="https://vac.dev/_og/56b88e740d69863c377148f55cfc46ce99b87374.png"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-status-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-status-current"><meta data-rh="true" property="og:title" content="71/STATUS-PUSH-NOTIFICATION-SERVER | Vac Research"><meta data-rh="true" name="description" content="A set of methods to allow Status clients to use push notification services in mobile environments."><meta data-rh="true" property="og:description" content="A set of methods to allow Status clients to use push notification services in mobile environments."><link data-rh="true" rel="icon" href="/theme/image/favicon.ico"><link data-rh="true" rel="canonical" href="https://vac.dev/status/71/push-notification-server"><link data-rh="true" rel="alternate" href="https://vac.dev/status/71/push-notification-server" hreflang="en"><link data-rh="true" rel="alternate" href="https://vac.dev/status/71/push-notification-server" hreflang="x-default"><link rel="alternate icon" type="image/png" href="/theme/image/favicon.png">
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itemprop="name">71/STATUS-PUSH-NOTIFICATION-SERVER</span><meta itemprop="position" content="1"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>71/STATUS-PUSH-NOTIFICATION-SERVER</h1><div class="tocMobile_imaF"><div class="tocCollapsible_ROek theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_dxRj"><div></div><span class="lsd-typography lsd-typography--body2">On this page</span><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" class="lsd-icon lsd-icon--small lsd-icon--filled"><path d="M10.5 5.66125L9.6775 4.83875L7 7.51041L4.3225 4.83874L3.5 5.66125L7 9.16125L10.5 5.66125Z" fill="black"></path></svg></button></div></div></header><ul><li>Status: draft</li><li>Category: Standards Track</li><li>Editor: Jimmy Debe &lt;<a href="mailto:jimmy@status.im" target="_blank" rel="noopener noreferrer">jimmy@status.im</a>&gt;</li><li>Contributors:<ul><li>Andrea Maria Piana &lt;<a href="mailto:andreap@status.im" target="_blank" rel="noopener noreferrer">andreap@status.im</a>&gt;</li></ul></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="abstract">Abstract<a href="#abstract" class="hash-link" aria-label="Direct link to Abstract" title="Direct link to Abstract">​</a></h2><p>A push notification server implementation for IOS devices and Android devices.
This specification provides a set of methods that allow clients
to use push notification services in mobile environments.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="background">Background<a href="#background" class="hash-link" aria-label="Direct link to Background" title="Direct link to Background">​</a></h2><p>Push notification for iOS and
Android devices can only be implemented by relying on
<a href="https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/APNSOverview.html#//apple_ref/doc/uid/TP40008194-CH8-SW1" target="_blank" rel="noopener noreferrer">APN</a>,
Apple Push Notification, service for iOS or
<a href="https://firebase.google.com/" target="_blank" rel="noopener noreferrer">Firebase</a> for Android.</p><p>For some Android devices, foreground services are restricted,
requiring a user to grant authorization to applications
to use foreground notifications.
Apple iOS devices restrict notifications to
a few internal functions that every application can not use.
Applications on iOS can request execution time when they are in the background.
This has a limited set of use cases for example,
it will not schedule any time if the application was closed with force quit.
Requesting execution time is not responsive enough to
implement a push notification system.
Status provides a set of methods to acheive push notification services.</p><p>Since this can not be safely implemented in a privacy-preserving manner,
clients need to be given an option to opt-in to receive and send push notifications.
They are disabled by default.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="specification">Specification<a href="#specification" class="hash-link" aria-label="Direct link to Specification" title="Direct link to Specification">​</a></h2><p>The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”,
“SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and
“OPTIONAL” in this document are to be interpreted as described in <a href="https://www.ietf.org/rfc/rfc2119.txt" target="_blank" rel="noopener noreferrer">2119</a>.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="definitions">Definitions<a href="#definitions" class="hash-link" aria-label="Direct link to Definitions" title="Direct link to Definitions">​</a></h3><table><thead><tr><th>Terminology</th><th>Description</th></tr></thead><tbody><tr><td>client</td><td>A node that implements the Status specifications.</td></tr><tr><td>user</td><td>The owner of a device that runs a client.</td></tr><tr><td>server</td><td>A service that performs push notifications.</td></tr><tr><td>Waku-Store</td><td>A Waku node that decides to provide functionality to store messages permanently and deliver the messages to requesting clients. As described in <a href="/waku/standards/core/13/store">13/WAKU-STORE</a> specification.</td></tr></tbody></table><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="server-components">Server Components<a href="#server-components" class="hash-link" aria-label="Direct link to Server Components" title="Direct link to Server Components">​</a></h3><table><thead><tr><th>Components</th><th>Description</th></tr></thead><tbody><tr><td>gorush Instance</td><td>Only used by push notification servers and MUST be publicly available.</td></tr><tr><td>Push Notification Server</td><td>Used by clients to register for receiving and sending notifications.</td></tr><tr><td>Registering Client</td><td>A client that wants to receive push notifications.</td></tr><tr><td>Sending Client</td><td>A client that wants to send push notifications.</td></tr></tbody></table><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="requirements">Requirements<a href="#requirements" class="hash-link" aria-label="Direct link to Requirements" title="Direct link to Requirements">​</a></h3><p>The party releasing the app MUST possess a certificate
for the Apple Push Notification service and
it MUST run a <a href="https://github.com/appleboy/gorush" target="_blank" rel="noopener noreferrer">gorush</a>
publicly accessible server for sending the actual notification.
The party releasing the app MUST run its own <a href="https://github.com/appleboy/gorush" target="_blank" rel="noopener noreferrer">gorush</a>.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="push-notification-server-flow">Push Notification Server Flow<a href="#push-notification-server-flow" class="hash-link" aria-label="Direct link to Push Notification Server Flow" title="Direct link to Push Notification Server Flow">​</a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="registration-process">Registration Process<a href="#registration-process" class="hash-link" aria-label="Direct link to Registration Process" title="Direct link to Registration Process">​</a></h4><p></p><div class="wrapper_SWrM active_qZD5"><img loading="lazy" alt="registration" src="/assets/images/registration-cc6fec7743be6c531d9b93203960114f.png" width="407" height="331" class="img_ev3q"><button class="fullscreenButton_Bocn lsd-icon-button lsd-icon-button--medium lsd-icon-button--outlined"><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M1.75 2.917V5.25h1.167V2.917H5.25V1.75H2.917A1.17 1.17 0 0 0 1.75 2.917ZM2.917 8.75H1.75v2.333a1.17 1.17 0 0 0 1.167 1.167H5.25v-1.167H2.917V8.75Zm8.166 2.333H8.75v1.167h2.333a1.17 1.17 0 0 0 1.167-1.167V8.75h-1.167v2.333Zm0-9.333H8.75v1.167h2.333V5.25h1.167V2.917a1.17 1.17 0 0 0-1.167-1.167Z" fill="#fff"></path></svg></div></button></div><p></p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="sending-and-receiving-notification-process">Sending and Receiving Notification Process<a href="#sending-and-receiving-notification-process" class="hash-link" aria-label="Direct link to Sending and Receiving Notification Process" title="Direct link to Sending and Receiving Notification Process">​</a></h4><p></p><div class="wrapper_SWrM active_qZD5"><img loading="lazy" alt="notification" src="/assets/images/notification-03a7ab32603bbca7741c8513211468dd.png" width="518" height="607" class="img_ev3q"><button class="fullscreenButton_Bocn lsd-icon-button lsd-icon-button--medium lsd-icon-button--outlined"><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M1.75 2.917V5.25h1.167V2.917H5.25V1.75H2.917A1.17 1.17 0 0 0 1.75 2.917ZM2.917 8.75H1.75v2.333a1.17 1.17 0 0 0 1.167 1.167H5.25v-1.167H2.917V8.75Zm8.166 2.333H8.75v1.167h2.333a1.17 1.17 0 0 0 1.167-1.167V8.75h-1.167v2.333Zm0-9.333H8.75v1.167h2.333V5.25h1.167V2.917a1.17 1.17 0 0 0-1.167-1.167Z" fill="#fff"></path></svg></div></button></div><p></p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="registering-client">Registering Client<a href="#registering-client" class="hash-link" aria-label="Direct link to Registering Client" title="Direct link to Registering Client">​</a></h3><p>Registering a client with a push notification service.</p><ul><li><p>A client MAY register with one or
more push notification services in order to increase availability.</p></li><li><p>A client SHOULD make sure that all the notification services they registered with
have the same information about their tokens.</p></li><li><p>A <code>PNR message</code> (Push Notification Registration) MUST be sent to the
<a href="/waku/standards/application/54/x3dh-sessions">partitioned topic</a>
for the public key of the node, encrypted with this key.</p></li><li><p>The message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_REGISTRATION</code>.</p></li><li><p>The marshaled protobuf payload MUST also be encrypted with AES-GCM
using the Diffie–Hellman key generated from the client and server identity.
This is done in order to ensure that the extracted key from the signature
will be considered invalid if it can’t decrypt the payload.</p></li></ul><p>The content of the message MUST contain the following <a href="https://developers.google.com/protocol-buffers/" target="_blank" rel="noopener noreferrer">protobuf record</a>:</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationRegistration {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum TokenType {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_TOKEN_TYPE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> APN_TOKEN = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> FIREBASE_TOKEN = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> TokenType token_type = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string device_token = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string installation_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string access_token = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool enabled = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 version = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes allowed_key_list = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes blocked_chat_list = 8;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool unregister = 9;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes grant = 10;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool allow_from_contacts_only = 11;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string apn_topic = 12;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool block_mentions = 13;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes allowed_mentions_chat_list = 14;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><p>A push notification server will handle the message according to the following rules:</p><ul><li><p>it MUST extract the public key of the sender from the signature and
verify that the payload can be decrypted successfully.</p></li><li><p>it MUST verify that <code>token_type</code> is supported.</p></li><li><p>it MUST verify that <code>device_token</code> is non empty.</p></li><li><p>it MUST verify that <code>installation_id</code> is non empty.</p></li><li><p>it MUST verify that <code>version</code> is non-zero and
greater than the currently stored version for the public key and
<code>installation_id</code> of the sender, if any.</p></li><li><p>it MUST verify that <code>grant</code> is non empty and according to the Grant Server specs.</p></li><li><p>it MUST verify that <code>access_token</code> is a valid uuid.</p></li><li><p>it MUST verify that <code>apn_topic</code> is set if token_type is APN_TOKEN.</p></li><li><p>The message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_REGISTRATION_RESPONSE</code>.</p></li></ul><p>The payload of the response is:</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationRegistrationResponse {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool success = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ErrorType error = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes request_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum ErrorType {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_ERROR_TYPE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MALFORMED_MESSAGE = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> VERSION_MISMATCH = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNSUPPORTED_TOKEN_TYPE = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> INTERNAL_ERROR = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><p>A client SHOULD listen for a response sent on the
<a href="/waku/standards/application/54/x3dh-sessions">partitioned topic</a>
that the key used to register.
If success is true the client has registered successfully.</p><p>If <code>success</code> is <code>false</code>:
&gt; If <code>MALFORMED_MESSAGE</code> is returned,
the request SHOULD NOT be retried without ensuring that it is correctly formed.
&gt; If <code>INTERNAL_ERROR</code> is returned, the request MAY be retried,
but the client MUST backoff exponentially.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-errors">Handle Errors<a href="#handle-errors" class="hash-link" aria-label="Direct link to Handle Errors" title="Direct link to Handle Errors">​</a></h4><ul><li><p>If the message can’t be decrypted, the message MUST be discarded.</p></li><li><p>If <code>token_type</code> is not supported, a response MUST be sent with <code>error</code> set to <code>UNSUPPORTED_TOKEN_TYPE</code>.</p></li><li><p>If <code>token</code>, <code>installation_id</code>, <code>device_tokens</code>, <code>version</code> are empty,
a response MUST be sent with <code>error</code> set to <code>MALFORMED_MESSAGE</code>.</p></li><li><p>If the <code>version</code> is equal or less than the currently stored <code>version</code>,
a response MUST be sent with <code>error</code> set to <code>VERSION_MISMATCH</code>.</p></li><li><p>If any other error occurs the <code>error</code> SHOULD be set to <code>INTERNAL_ERROR</code>.</p></li><li><p>If the response is successful <code>success</code> MUST be set to <code>true</code> otherwise
a response MUST be sent with <code>success</code> set to <code>false</code>.</p></li><li><p><code>request_id</code> SHOULD be set to the
<a href="https://nvlpubs.nist.gov/nistpubs/fips/nist.fips.202.pdf" target="_blank" rel="noopener noreferrer"><code>SHAKE-256</code></a>
of the encrypted payload.</p></li><li><p>The response MUST be sent on the
<a href="/waku/standards/application/54/x3dh-sessions">partitioned topic</a>
of the sender and MUST not be encrypted using
the secure transport to facilitate the usage of ephemeral keys.</p></li><li><p>If no response is returned, the request SHOULD be considered failed and
MAY be retried with the same server or a different one, but clients
MUST exponentially backoff after each trial.</p></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="push-notification-server">Push Notification Server<a href="#push-notification-server" class="hash-link" aria-label="Direct link to Push Notification Server" title="Direct link to Push Notification Server">​</a></h2><p>A node that handles receiving and sending push notifications for clients.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="query-topic">Query Topic<a href="#query-topic" class="hash-link" aria-label="Direct link to Query Topic" title="Direct link to Query Topic">​</a></h3><p>On successful registration the server MUST be listening to the topic derived from:
&gt; <code>0x</code> + HexEncode(Shake256(CompressedClientPublicKey))</p><p>Using the topic derivation algorithm described here and listen for client queries.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="server-grant">Server Grant<a href="#server-grant" class="hash-link" aria-label="Direct link to Server Grant" title="Direct link to Server Grant">​</a></h4><p>A client MUST authorize a push notification server to send them push notifications.
This is done by building a grant which is specific to a given client-server pair.
When receiving a grant,
the server MUST validate that the signature matches the registering client.</p><p>The grant is built as:</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token template-string template-punctuation string" style="color:rgb(255, 121, 198)">`</span><span class="token template-string string" style="color:rgb(255, 121, 198)">Signature(Keccak256(CompressedPublicKeyOfClient.CompressedPublicKeyOfServer.AccessToken), PrivateKeyOfClient)</span><span class="token template-string template-punctuation string" style="color:rgb(255, 121, 198)">`</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="unregistering-with-a-server">Unregistering with a Server<a href="#unregistering-with-a-server" class="hash-link" aria-label="Direct link to Unregistering with a Server" title="Direct link to Unregistering with a Server">​</a></h4><ul><li>To unregister a client MUST send a <code>PushNotificationRegistration</code>
request as described above with <code>unregister</code> set to <code>true</code>,
or removing their device information.</li><li>The server MUST remove all data about this user if <code>unregistering</code> is <code>true</code>,
apart from the <code>hash</code> of the public key and
the <code>version</code> of the last options,
in order to make sure that old messages are not processed.</li><li>A client MAY unregister from a server on explicit logout
if multiple chat keys are used on a single device.</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="re-registering-with-a-server">Re-registering with a Server<a href="#re-registering-with-a-server" class="hash-link" aria-label="Direct link to Re-registering with a Server" title="Direct link to Re-registering with a Server">​</a></h4><ul><li>A client SHOULD re-register with the node if the APN or FIREBASE token changes.</li><li>When re-registering a client SHOULD ensure
that it has the most up-to-date <code>PushNotificationRegistration</code> and
increment <code>version</code> if necessary.</li><li>Once re-registered, a client SHOULD advertise the changes.
Changing options is handled the same as re-registering.</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="advertising-a-server">Advertising a Server<a href="#advertising-a-server" class="hash-link" aria-label="Direct link to Advertising a Server" title="Direct link to Advertising a Server">​</a></h4><p>Each user registered with one or more push notification servers
SHOULD advertise periodically the push notification services
they have registered with for each device they own.</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationQueryInfo {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string access_token = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string installation_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes public_key = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes allowed_user_list = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes grant = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 version = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes server_public_key = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message ContactCodeAdvertisement {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated PushNotificationQueryInfo push_notification_info = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-advertisement-message">Handle Advertisement Message<a href="#handle-advertisement-message" class="hash-link" aria-label="Direct link to Handle Advertisement Message" title="Direct link to Handle Advertisement Message">​</a></h4><ul><li>The message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_QUERY_INFO</code>.</li><li>If no filtering is done based on public keys,
the access token SHOULD be included in the advertisement.
Otherwise it SHOULD be left empty.</li><li>This SHOULD be advertised on the
<a href="/waku/standards/application/53/x3dh">contact code topic</a> and
SHOULD be coupled with normal contact-code advertisement.</li><li>When a user register or re-register with a push notification service,
their contact-code SHOULD be re-advertised.</li><li>Multiple servers MAY be advertised for the same installation_id
 for redundancy reasons.</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="discovering-a-server">Discovering a Server<a href="#discovering-a-server" class="hash-link" aria-label="Direct link to Discovering a Server" title="Direct link to Discovering a Server">​</a></h4><p>To discover a push notification service for a given user, their
<a href="/waku/standards/application/53/x3dh">contact code topic</a>
SHOULD be listened to.
A Waku-Store node can be queried for the specific topic
to retrieve the most up-to-date contact code.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="querying-a-server">Querying a Server<a href="#querying-a-server" class="hash-link" aria-label="Direct link to Querying a Server" title="Direct link to Querying a Server">​</a></h4><p>If a token is not present in the latest advertisement for a user,
the server SHOULD be queried directly.</p><p>To query a server a message:</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationQuery {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes public_keys = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-query-message">Handle Query Message<a href="#handle-query-message" class="hash-link" aria-label="Direct link to Handle Query Message" title="Direct link to Handle Query Message">​</a></h4><ul><li>The message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_QUERY</code>.</li><li>it MUST be sent to the server on the topic derived from the hashed public key
of the key we are querying,
<a href="#query-topic">as described above</a>.</li><li>An ephemeral key SHOULD be used and SHOULD NOT be encrypted using the <a href="/waku/standards/application/53/x3dh">secure transport</a>.</li></ul><p>If the server has information about the client a response MUST be sent:</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationQueryInfo {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string access_token = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string installation_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes public_key = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes allowed_user_list = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes grant = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 version = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes server_public_key = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationQueryResponse {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated PushNotificationQueryInfo info = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes message_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool success = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-query-response">Handle Query Response<a href="#handle-query-response" class="hash-link" aria-label="Direct link to Handle Query Response" title="Direct link to Handle Query Response">​</a></h4><ul><li><p>A <code>PushNotificationQueryResponse</code> message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_QUERY_RESPONSE</code>.
Otherwise a response MUST NOT be sent.</p></li><li><p>If <code>allowed_key_list</code> is not set <code>access_token</code> MUST be set
and <code>allowed_key_list</code> MUST NOT be set.</p></li><li><p>If <code>allowed_key_list</code> is set <code>allowed_key_list</code> MUST be set and
<code>access_token</code> MUST NOT be set.</p></li><li><p>If <code>access_token</code> is returned,
the <code>access_token</code> SHOULD be used to send push notifications.</p></li><li><p>If <code>allowed_key_list</code> are returned,
the client SHOULD decrypt each token by generating an <code>AES-GCM</code> symmetric key
from the Diffie–Hellman between the target client and itself.
If AES decryption succeeds,
it will return a valid <code>uuid</code> which is what is used for access_token.
The token SHOULD be used to send push notifications.</p></li><li><p>The response MUST be sent on the
<a href="/waku/standards/application/54/x3dh-sessions">partitioned topic</a>
of the sender and
MUST NOT be encrypted using the
<a href="/waku/standards/application/53/x3dh">secure transport</a>
to facilitate the usage of ephemeral keys.</p></li><li><p>On receiving a response,
a client MUST verify <code>grant</code> to ensure that the server
has been authorized to send push notification to a given client.</p></li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="sending-client">Sending Client<a href="#sending-client" class="hash-link" aria-label="Direct link to Sending Client" title="Direct link to Sending Client">​</a></h3><p>Sending a push notification</p><ul><li><p>When sending a push notification,
only the <code>installation_id</code> for the devices targeted by the message SHOULD be used.</p></li><li><p>If a message is for all the user devices,
all the <code>installation_id</code> known to the client MAY be used.</p></li><li><p>The number of devices MAY be capped in order to reduce resource consumption.</p></li><li><p>At least 3 devices SHOULD be targeted, ordered by last activity.</p></li><li><p>For any device that a token is available, or that
a token is successfully queried,
a push notification message SHOULD be sent to the corresponding
push notification server.</p></li></ul><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotification {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string access_token = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string chat_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes public_key = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string installation_id = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes message = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> PushNotificationType type = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum PushNotificationType {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_PUSH_NOTIFICATION_TYPE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MESSAGE = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MENTION = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes author = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationRequest {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated PushNotification requests = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes message_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-notification-request">Handle Notification Request<a href="#handle-notification-request" class="hash-link" aria-label="Direct link to Handle Notification Request" title="Direct link to Handle Notification Request">​</a></h4><ul><li><p>A <code>PushNotificationRequest</code> message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_REQUEST</code>.</p></li><li><p>Where <code>message</code> is the encrypted payload of the message and
<code>chat_id</code> is the <code>SHAKE-256</code> of the <code>chat_id</code>.
<code>message_id</code> is the id of the message,
<code>author</code> is the <code>SHAKE-256</code> of the public key of the sender.</p></li><li><p>If multiple server are available for a given push notification,
only one notification MUST be sent.</p></li><li><p>If no response is received a client SHOULD wait at least 3 seconds,
after which the request MAY be retried against a different server.</p></li><li><p>This message SHOULD be sent using an ephemeral key.</p></li></ul><p>On receiving the message, the push notification server MUST validate the access token.
If the access token is valid, a notification MUST be sent to the
<a href="https://github.com/appleboy/gorush" target="_blank" rel="noopener noreferrer">gorush</a> instance with the following data:</p><div class="language-yaml codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-yaml codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;notifications&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;tokens&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;token_a&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;token_b&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;platform&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;message&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;You have a new message&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;data&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;chat_id&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> chat_id</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;message&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> message</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">&quot;installation_ids&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">installation_id_1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> installation_id_2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><p>Where platform is 1 for iOS and 2 for Firebase, according to the <a href="https://github.com/appleboy/gorush" target="_blank" rel="noopener noreferrer">gorush documentation</a>.</p><p>A server MUST return a response message:</p><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationReport {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool success = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ErrorType error = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum ErrorType {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_ERROR_TYPE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> WRONG_TOKEN = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> INTERNAL_ERROR = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> NOT_REGISTERED = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes public_key = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string installation_id = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">message PushNotificationResponse {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes message_id = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated PushNotificationReport reports = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><p>Where <code>message_id</code> is the <code>message_id</code> sent by the client.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="handle-notification-response">Handle Notification Response<a href="#handle-notification-response" class="hash-link" aria-label="Direct link to Handle Notification Response" title="Direct link to Handle Notification Response">​</a></h4><ul><li><p>A <code>PushNotificationResponse</code> message MUST be wrapped in a
<a href="/status/62/payloads"><code>ApplicationMetadataMessage</code></a> with type set to <code>PUSH_NOTIFICATION_RESPONSE</code>.</p></li><li><p>The response MUST be sent on the
<a href="/waku/standards/application/54/x3dh-sessions">partitioned topic</a>
of the sender and
MUST not be encrypted using the
<a href="/waku/standards/application/53/x3dh">secure transport</a>
to facilitate the usage of ephemeral keys.</p></li><li><p>If the request is accepted <code>success</code> MUST be set to <code>true</code>.
Otherwise <code>success</code> MUST be set to <code>false</code>.</p></li><li><p>If <code>error</code> is <code>BAD_TOKEN</code> the client MAY query again the server for the token and
retry the request.</p></li><li><p>If <code>error</code> is <code>INTERNAL_ERROR</code> the client MAY retry the request.</p></li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="protobuf-description">Protobuf Description<a href="#protobuf-description" class="hash-link" aria-label="Direct link to Protobuf Description" title="Direct link to Protobuf Description">​</a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationregistration">PushNotificationRegistration<a href="#pushnotificationregistration" class="hash-link" aria-label="Direct link to PushNotificationRegistration" title="Direct link to PushNotificationRegistration">​</a></h4><p><code>token_type</code>: the type of token. Currently supported is <code>APN_TOKEN</code> for Apple Push.</p><p><code>device_token</code>: the actual push notification token sent by <code>Firebase</code> or
<code>APN</code> and <code>FIREBASE_TOKEN</code> for firebase.</p><p><code>installation_id</code>: the <code>installation_id</code> of the device.</p><p><code>access_token</code>: the access token that will be given to clients to send push notifications.</p><p><code>enabled</code>: whether the device wants to be sent push notifications.</p><p><code>version</code>: a monotonically increasing number identifying the current <code>PushNotificationRegistration</code>.
Any time anything is changed in the record it MUST be increased by the client,
otherwise the request will not be accepted.</p><p><code>allowed_key_list</code>: a list of <code>access_token</code> encrypted with the AES key
generated by Diffie–Hellman between the publisher and the allowed contact.</p><p><code>blocked_chat_list</code>: a list of <code>SHA2-256</code> hashes of chat ids.
Any chat id in this list will not trigger a notification.</p><p><code>unregister</code>: whether the account should be unregistered.</p><p><code>grant</code>: the grant for this specific server.</p><p><code>allow_from_contacts_only</code>: whether the client only wants
push notifications from contacts.</p><p><code>apn_topic</code>: the APN topic for the push notification.</p><p><code>block_mentions</code>: whether the client does not want to be notified on mentions.</p><p><code>allowed_mentions_chat_list</code>: a list of SHA2-256 hashes of chat ids
where we want to receive mentions.</p><p>DATA DISCLOSED</p><ul><li><p>Type of device owned by a given user.</p></li><li><p>The <code>FIREBASE</code> or <code>APN</code> push notification token,</p></li><li><p>Hash of the <code>chat_id</code> a user is not interested in for notifications,</p></li><li><p>The number of times a push notification record has been modified by the user,</p></li><li><p>The number of contacts a client has, in case <code>allowed_key_list</code> is set.</p></li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationregistrationresponse">PushNotificationRegistrationResponse<a href="#pushnotificationregistrationresponse" class="hash-link" aria-label="Direct link to PushNotificationRegistrationResponse" title="Direct link to PushNotificationRegistrationResponse">​</a></h4><p><code>success</code>: whether the registration was successful</p><p><code>error</code>: the error type, if any</p><p><code>request_id</code>: the <code>SHAKE-256</code> hash of the <code>signature</code> of the request</p><p><code>preferences</code>: the server stored preferences in case of an error</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="contactcodeadvertisement">ContactCodeAdvertisement<a href="#contactcodeadvertisement" class="hash-link" aria-label="Direct link to ContactCodeAdvertisement" title="Direct link to ContactCodeAdvertisement">​</a></h4><p><code>push_notification_info</code>: the information for each device advertised</p><p>DATA DISCLOSED</p><ul><li>The chat key of the sender</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationquery">PushNotificationQuery<a href="#pushnotificationquery" class="hash-link" aria-label="Direct link to PushNotificationQuery" title="Direct link to PushNotificationQuery">​</a></h4><p><code>public_keys</code>: the <code>SHAKE-256</code> of the public keys the client is interested in</p><p>DATA DISCLOSED</p><ul><li>The hash of the public keys the client is interested in</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationqueryinfo">PushNotificationQueryInfo<a href="#pushnotificationqueryinfo" class="hash-link" aria-label="Direct link to PushNotificationQueryInfo" title="Direct link to PushNotificationQueryInfo">​</a></h4><p><code>access_token</code>: the access token used to send a push notification</p><p><code>installation_id</code>: the <code>installation_id</code> of the device associated with the <code>access_token</code>.</p><p><code>public_key</code>: the <code>SHAKE-256</code> of the public key associated with this <code>access_token</code>
and <code>installation_id</code>.</p><p><code>allowed_key_list</code>: a list of encrypted access tokens to be returned
to the client in case there’s any filtering on public keys in place.</p><p><code>grant</code>: the grant used to register with this server.</p><p><code>version</code>: the version of the registration on the server.</p><p><code>server_public_key</code>: the compressed public key of the server.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationqueryresponse">PushNotificationQueryResponse<a href="#pushnotificationqueryresponse" class="hash-link" aria-label="Direct link to PushNotificationQueryResponse" title="Direct link to PushNotificationQueryResponse">​</a></h4><p><code>info</code>: a list of <code>PushNotificationQueryInfo</code>.</p><p><code>message_id</code>: the message id of the <code>PushNotificationQueryInfo</code>
the server is replying to.</p><p><code>success</code>: whether the query was successful.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotification">PushNotification<a href="#pushnotification" class="hash-link" aria-label="Direct link to PushNotification" title="Direct link to PushNotification">​</a></h4><p><code>access_token</code>: the access token used to send a push notification.
<code>chat_id</code>: the <code>SHAKE-256</code> of the <code>chat_id</code>.
<code>public_key</code>: the <code>SHAKE-256</code> of the compressed public key of the receiving client.
<code>installation_id</code>: the <code>installation_id</code> of the receiving client.
<code>message</code>: the encrypted message that is being notified on.
<code>type</code>: the type of the push notification, either <code>MESSAGE</code> or <code>MENTION</code>
<code>author</code>: the <code>SHAKE-256</code> of the public key of the sender</p><p>Data disclosed</p><ul><li><p>The <code>SHAKE-256</code> hash of the <code>chat_id</code> the notification is to be sent for</p></li><li><p>The cypher text of the message</p></li><li><p>The <code>SHAKE-256</code> hash of the public key of the sender</p></li><li><p>The type of notification</p></li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationrequest">PushNotificationRequest<a href="#pushnotificationrequest" class="hash-link" aria-label="Direct link to PushNotificationRequest" title="Direct link to PushNotificationRequest">​</a></h4><p><code>requests</code>: a list of PushNotification
<code>message_id</code>: the <a href="/status/62/payloads">Status message id</a></p><p>Data disclosed</p><ul><li>The status <code>message_id</code> for which the notification is for</li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationresponse">PushNotificationResponse<a href="#pushnotificationresponse" class="hash-link" aria-label="Direct link to PushNotificationResponse" title="Direct link to PushNotificationResponse">​</a></h4><p><code>message_id</code>: the <code>message_id</code> being notified on.
<code>reports</code>: a list of <code>PushNotificationReport</code></p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pushnotificationreport">PushNotificationReport<a href="#pushnotificationreport" class="hash-link" aria-label="Direct link to PushNotificationReport" title="Direct link to PushNotificationReport">​</a></h4><p><code>success</code>: whether the push notification was successful.
<code>error</code>: the type of the error in case of failure.
<code>public_key</code>: the public key of the user being notified.
<code>installation_id</code>: the <code>installation_id</code> of the user being notified.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="anonymous-mode">Anonymous Mode<a href="#anonymous-mode" class="hash-link" aria-label="Direct link to Anonymous Mode" title="Direct link to Anonymous Mode">​</a></h3><p>In order to preserve privacy, the client MAY provide anonymous mode of operations
to propagate information about the user.
A client in anonymous mode can register with the server
using a key that is different from their chat key.
This will hide their real chat key. This public key is effectively a secret and
SHOULD only be disclosed to clients approved to notify a user.</p><ul><li><p>A client MAY advertise the access token on the
<a href="/waku/standards/application/53/x3dh">contact-code topic</a>
of the key generated.</p></li><li><p>A client MAY share their public key contact updates in the
<a href="https://developers.google.com/protocol-buffers/" target="_blank" rel="noopener noreferrer">protobuf record</a>.</p></li><li><p>A client receiving a push notification public key
SHOULD listen to the contact code topic of the push notification public key for updates.</p></li></ul><p>The method described above effectively does not share the identity of the sender
nor the receiver to the server, but
MAY result in missing push notifications
as the propagation of the secret is left to the client.
This can be mitigated by <a href="/status/62/payloads">device syncing</a>,
but not completely addressed.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="securityprivacy-considerations">Security/Privacy Considerations<a href="#securityprivacy-considerations" class="hash-link" aria-label="Direct link to Security/Privacy Considerations" title="Direct link to Security/Privacy Considerations">​</a></h2><p>If anonymous mode is not used,
when registering with a push notification service a client will disclose:</p><ul><li><p>The devices that will receive notifications.</p></li><li><p>The chat key.</p></li></ul><p>A client MAY disclose:</p><ul><li>The hash of the <code>chat_id</code> they want to filter out.</li></ul><p>When running in anonymous mode, the client’s chat key is not disclosed.</p><p>When querying a push notification server a client will disclose:</p><ul><li>That it is interested in sending push notification to another client,
but querying client’s chat key is not disclosed.</li></ul><p>When sending a push notification a client will disclose:</p><ul><li>The <code>shake-256</code> of the <code>chat_id</code>.</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="copyright">Copyright<a href="#copyright" class="hash-link" aria-label="Direct link to Copyright" title="Direct link to Copyright">​</a></h2><p>Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/" target="_blank" rel="noopener noreferrer">CC0</a>.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="references">References<a href="#references" class="hash-link" aria-label="Direct link to References" title="Direct link to References">​</a></h2><ol><li><a href="https://github.com/status-im/specs/blob/master/docs/raw/push-notification-server.md" target="_blank" rel="noopener noreferrer">PUSH-NOTIFICATION-SERVER, Initial Specification</a></li><li><a href="https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/APNSOverview.html#//apple_ref/doc/uid/TP40008194-CH8-SW1" target="_blank" rel="noopener noreferrer">Push Notification, Apple Developer</a></li><li><a href="https://firebase.google.com" target="_blank" rel="noopener noreferrer">Firebase</a></li><li><a href="/waku/standards/core/13/store">13/WAKU2-STORE</a></li><li><a href="https://github.com/appleboy/gorush" target="_blank" rel="noopener noreferrer">gorush</a></li><li><a href="/waku/standards/application/54/x3dh-sessions">54/WAKU2-X3DH-SESSIONS</a></li><li><a href="/status/62/payloads">62/PAYLOAD</a></li><li><a href="https://nvlpubs.nist.gov/nistpubs/fips/nist.fips.202.pdf" target="_blank" rel="noopener noreferrer">SHAKE-256</a></li><li><a href="https://developers.google.com/protocol-buffers" target="_blank" rel="noopener noreferrer">Protocol Buffers</a></li><li><a href="/waku/standards/application/53/x3dh">53/WAKU2-X3DH</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/status/65/account-address"><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M11.667 6.417h-7.1l3.261-3.261L7 2.333 2.333 7 7 11.667l.823-.823-3.255-3.26h7.099V6.417Z" fill="#fff"></path></svg></div><span class="lsd-typography lsd-typography--body2 pagination-nav__label">65/STATUS-ACCOUNT-ADDRESS</span></a></nav></div></div><div class="gap1_XuuQ"></div><div class="toc_pP_5"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#abstract" class="table-of-contents__link toc-highlight">Abstract</a></li><li><a href="#background" class="table-of-contents__link toc-highlight">Background</a></li><li><a href="#specification" class="table-of-contents__link toc-highlight">Specification</a><ul><li><a href="#definitions" class="table-of-contents__link toc-highlight">Definitions</a></li><li><a href="#server-components" class="table-of-contents__link toc-highlight">Server Components</a></li><li><a href="#requirements" class="table-of-contents__link toc-highlight">Requirements</a></li><li><a href="#push-notification-server-flow" class="table-of-contents__link toc-highlight">Push Notification Server Flow</a></li><li><a href="#registering-client" class="table-of-contents__link toc-highlight">Registering Client</a></li></ul></li><li><a href="#push-notification-server" class="table-of-contents__link toc-highlight">Push Notification Server</a><ul><li><a href="#query-topic" class="table-of-contents__link toc-highlight">Query Topic</a></li><li><a href="#sending-client" class="table-of-contents__link toc-highlight">Sending Client</a></li><li><a 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