mirror of https://github.com/waku-org/js-waku.git
298 lines
9.8 KiB
Markdown
298 lines
9.8 KiB
Markdown
[](https://npmjs.org/package/js-waku)
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[](https://discord.gg/j5pGbn7MHZ)
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# js-waku
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A JavaScript implementation of the [Waku v2 protocol](https://rfc.vac.dev/spec/10/).
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## Documentation
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In the [section below](#usage) you can find explanations for the main API.
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We also have [guides](https://github.com/status-im/js-waku/blob/main/guides/menu.md) available
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and [code examples](https://github.com/status-im/js-waku/blob/main/examples/examples.md).
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You can read the latest `main` branch documentation at [https://status-im.github.io/js-waku/docs/](https://status-im.github.io/js-waku/docs/).
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Docs can also be generated locally using:
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```shell
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npm install
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npm run doc
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```
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## Usage
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Install `js-waku` package:
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```shell
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npm install js-waku
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```
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### Start a waku node
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```ts
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import { Waku } from 'js-waku';
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const waku = await Waku.create({ bootstrap: true });
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```
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### Listen for messages
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The `contentTopic` is a metadata `string` that allows categorization of messages on the waku network.
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Depending on your use case, you can either create one (or several) new `contentTopic`(s) or look at the [RFCs](https://rfc.vac.dev/) and use an existing `contentTopic`.
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See [How to Choose a Content Topic](./guides/choose-content-topic.md) for more details.
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For example, if you were to use a new `contentTopic` such as `/my-cool-app/1/my-use-case/proto`,
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here is how to listen to new messages received via [Waku v2 Relay](https://rfc.vac.dev/spec/11/):
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```ts
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waku.relay.addObserver((msg) => {
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console.log("Message received:", msg.payloadAsUtf8)
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}, ["/my-cool-app/1/my-use-case/proto"]);
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```
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The examples chat apps currently use content topic `"/toy-chat/2/huilong/proto"`.
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### Send messages
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There are two ways to send messages:
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#### Waku Relay
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[Waku Relay](https://rfc.vac.dev/spec/11/) is the most decentralized option,
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peer receiving your messages are unlikely to know whether you are the originator or simply forwarding them.
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However, it does not give you any delivery information.
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```ts
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import { WakuMessage } from 'js-waku';
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const msg = await WakuMessage.fromUtf8String("Here is a message!", "/my-cool-app/1/my-use-case/proto")
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await waku.relay.send(msg);
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```
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#### Waku Light Push
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[Waku Light Push](https://rfc.vac.dev/spec/19/) gives you confirmation that the light push server node has
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received your message.
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However, it means that said node knows you are the originator of the message.
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It cannot guarantee that the node will forward the message.
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```ts
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const ack = await waku.lightPush.push(message);
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if (!ack?.isSuccess) {
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// Message was not sent
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}
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```
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### Retrieve archived messages
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The [Waku v2 Store protocol](https://rfc.vac.dev/spec/13/) enables more permanent nodes to store messages received via relay
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and ephemeral clients to retrieve them (e.g. mobile phone resuming connectivity).
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The protocol implements pagination meaning that it may take several queries to retrieve all messages.
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Query a waku store peer to check historical messages:
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```ts
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// Process messages once they are all retrieved
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const messages = await waku.store.queryHistory(['/my-cool-app/1/my-use-case/proto']);
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messages.forEach((msg) => {
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console.log('Message retrieved:', msg.payloadAsUtf8);
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});
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// Or, pass a callback function to be executed as pages are received:
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waku.store.queryHistory(['/my-cool-app/1/my-use-case/proto'], {
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callback: (messages) => {
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messages.forEach((msg) => {
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console.log('Message retrieved:', msg.payloadAsUtf8);
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});
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}
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});
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```
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### Encryption & Signature
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With js-waku, you can:
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- Encrypt messages over the wire using public/private key pair (asymmetric encryption),
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- Encrypt messages over the wire using a unique key to both encrypt and decrypt (symmetric encryption),
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- Sign and verify your waku messages (must use encryption, compatible with both symmetric and asymmetric).
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#### Cryptographic Libraries
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A quick note on the cryptographic libraries used as it is a not a straightforward affair:
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- Asymmetric encryption:
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Uses [ecies-geth](https://github.com/cyrildever/ecies-geth/)
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which in turns uses [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) Web API (browser),
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[secp256k1](https://www.npmjs.com/package/secp256k1) (native binding for node)
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or [elliptic](https://www.npmjs.com/package/elliptic) (pure JS if none of the other libraries are available).
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- Symmetric encryption:
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Uses [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) Web API (browser)
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or [NodeJS' crypto](https://nodejs.org/api/crypto.html) module.
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### Create new keys
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Asymmetric private keys and symmetric keys are expected to be 32 bytes arrays.
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```ts
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import { generatePrivateKey, generateSymmetricKey, getPublicKey } from 'js-waku';
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// Asymmetric
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const privateKey = generatePrivateKey();
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const publicKey = getPublicKey(privateKey);
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// Symmetric
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const symKey = generateSymmetricKey();
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```
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#### Encrypt Waku Messages
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To encrypt your waku messages, simply pass the encryption key when creating it:
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```ts
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import { WakuMessage } from "js-waku";
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// Asymmetric
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const message1 = await WakuMessage.fromBytes(payload, myAppContentTopic, {
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encPublicKey: publicKey,
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});
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// Symmetric
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const message2 = await WakuMessage.fromBytes(payload, myAppContentTopic, {
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symKey: symKey,
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});
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```
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#### Decrypt Waku Messages
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##### Waku Relay
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If you expect to receive encrypted messages then simply add private decryption key(s) to `WakuRelay`.
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Waku Relay will attempt to decrypt incoming messages with each keys, both for symmetric and asymmetric encryption.
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Messages that are successfully decrypted (or received in clear) will be passed to the observers, other messages will be omitted.
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```ts
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// Asymmetric
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waku.relay.addDecryptionKey(privateKey);
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// Symmetric
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waku.relay.addDecryptionKey(symKey);
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// Then add the observer
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waku.relay.addObserver(callback, [contentTopic]);
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```
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Keys can be removed using `WakuMessage.deleteDecryptionKey`.
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##### Waku Store
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```ts
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const messages = await waku.store.queryHistory([], {
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decryptionKeys: [privateKey, symKey]
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});
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```
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Similarly to relay, only decrypted or clear messages will be returned.
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#### Sign Waku Messages
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As per version 1`s [specs](https://rfc.vac.dev/spec/26/), signatures are only included in encrypted messages.
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In the case where your app does not need encryption then you could use symmetric encryption with a trivial key, I intend to dig [more on the subject](https://github.com/status-im/js-waku/issues/74#issuecomment-880440186) and come back with recommendation and examples.
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Signature keys can be generated the same way asymmetric keys for encryption are:
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```ts
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import { generatePrivateKey, getPublicKey, WakuMessage } from 'js-waku';
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const signPrivateKey = generatePrivateKey();
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// Asymmetric Encryption
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const message1 = await WakuMessage.fromBytes(payload, myAppContentTopic, {
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encPublicKey: recipientPublicKey,
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sigPrivKey: signPrivateKey
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});
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// Symmetric Encryption
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const message2 = await WakuMessage.fromBytes(payload, myAppContentTopic, {
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encPublicKey: symKey,
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sigPrivKey: signPrivateKey
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});
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```
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#### Verify Waku Message signatures
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Two fields are available on `WakuMessage` regarding signatures:
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- `signaturePublicKey`: If the message is signed, it holds the public key of the signature,
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- `signature`: If the message is signed, it holds the actual signature.
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Thus, if you expect messages to be signed by Alice,
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you can simply compare `WakuMessage.signaturePublicKey` with Alice's public key.
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As comparing hex string can lead to issues (is the `0x` prefix present?),
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simply use helper function `equalByteArrays`.
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```ts
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import { equalByteArrays } from 'js-waku/lib/utils';
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const sigPubKey = wakuMessage.signaturePublicKey;
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const isSignedByAlice = sigPubKey && equalByteArrays(sigPubKey, alicePublicKey);
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```
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## Changelog
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Release changelog can be found [here](https://github.com/status-im/js-waku/blob/main/CHANGELOG.md).
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## Bugs, Questions & Features
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If you encounter any bug or would like to propose new features, feel free to [open an issue](https://github.com/status-im/js-waku/issues/new/).
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To get help, join #dappconnect-support on [Vac Discord](https://discord.gg/j5pGbn7MHZ) or [Telegram](https://t.me/dappconnectsupport).
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For more general discussion and latest news, join #dappconnect on [Vac Discord](https://discord.gg/9DgykdmpZ6) or [Telegram](https://t.me/dappconnect).
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## Waku Protocol Support
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You can track progress on the [project board](https://github.com/status-im/js-waku/projects/1).
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- ✔: Supported
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- 🚧: Implementation in progress
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- ⛔: Support is not planned
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| Spec | Implementation Status |
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| ---- | -------------- |
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|[6/WAKU1](https://rfc.vac.dev/spec/6)|⛔|
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|[7/WAKU-DATA](https://rfc.vac.dev/spec/7)|⛔|
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|[8/WAKU-MAIL](https://rfc.vac.dev/spec/8)|⛔|
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|[9/WAKU-RPC](https://rfc.vac.dev/spec/9)|⛔|
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|[10/WAKU2](https://rfc.vac.dev/spec/10)|🚧|
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|[11/WAKU2-RELAY](https://rfc.vac.dev/spec/11)|✔|
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|[12/WAKU2-FILTER](https://rfc.vac.dev/spec/12)||
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|[13/WAKU2-STORE](https://rfc.vac.dev/spec/13)|✔ (querying node only)|
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|[14/WAKU2-MESSAGE](https://rfc.vac.dev/spec/14)|✔|
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|[15/WAKU2-BRIDGE](https://rfc.vac.dev/spec/15)||
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|[16/WAKU2-RPC](https://rfc.vac.dev/spec/16)|⛔|
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|[17/WAKU2-RLNRELAY](https://rfc.vac.dev/spec/17)||
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|[18/WAKU2-SWAP](https://rfc.vac.dev/spec/18)||
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|[19/WAKU2-LIGHTPUSH](https://rfc.vac.dev/spec/19/)|✔|
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## Contributing
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See [CONTRIBUTING.md](./CONTRIBUTING.md).
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## License
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Licensed and distributed under either of
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* MIT license: [LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT
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or
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* Apache License, Version 2.0, ([LICENSE-APACHE-v2](LICENSE-APACHE-v2) or http://www.apache.org/licenses/LICENSE-2.0)
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at your option. These files may not be copied, modified, or distributed except according to those terms.
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