Merge pull request #225 from status-im/179-asymmetric-enc-store

CHANGELOG.md

@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Keep alive feature that pings host regularly, reducing the chance of connections being dropped due to idle.
   Can be disabled or default frequency (10s) can be changed when calling `Waku.create`.
 - New `lib/utils` module for easy, dependency-less hex/bytes conversions.
+- New `peers` and `randomPeer` methods on `WakuStore` and `WakuLightPush` to have a better idea of available peers;
+  Note that it does not check whether Waku node is currently connected to said peers.
+- Enable passing decryption private keys to `WakuStore.queryHistory`.
 
 ### Changed
 - **Breaking**: Auto select peer if none provided for store and light push protocols.

src/lib/select_peer.ts

@@ -5,14 +5,18 @@ import { Peer } from 'libp2p/src/peer-store';
  * Returns a pseudo-random peer that supports the given protocol.
  * Useful for protocols such as store and light push
  */
-export function selectRandomPeer(
-  libp2p: Libp2p,
-  protocol: string
-): Peer | undefined {
-  const allPeers = Array.from(libp2p.peerStore.peers.values());
-  const size = allPeers.length;
-  const peers = allPeers.filter((peer) => peer.protocols.includes(protocol));
+export function selectRandomPeer(peers: Peer[]): Peer | undefined {
   if (peers.length === 0) return;
-  const index = Math.round(Math.random() * (size - 1));
-  return allPeers[index];
+
+  const index = Math.round(Math.random() * (peers.length - 1));
+  return peers[index];
+}
+
+/**
+ * Returns the list of peers that supports the given protocol.
+ */
+export function getPeersForProtocol(libp2p: Libp2p, protocol: string): Peer[] {
+  return Array.from(libp2p.peerStore.peers.values()).filter((peer) =>
+    peer.protocols.includes(protocol)
+  );
 }

src/lib/waku_light_push/index.ts

@@ -2,10 +2,11 @@ import concat from 'it-concat';
 import lp from 'it-length-prefixed';
 import pipe from 'it-pipe';
 import Libp2p from 'libp2p';
+import { Peer } from 'libp2p/src/peer-store';
 import PeerId from 'peer-id';
 
 import { PushResponse } from '../../proto/waku/v2/light_push';
-import { selectRandomPeer } from '../select_peer';
+import { getPeersForProtocol, selectRandomPeer } from '../select_peer';
 import { WakuMessage } from '../waku_message';
 import { DefaultPubsubTopic } from '../waku_relay';
 
@@ -54,7 +55,7 @@ export class WakuLightPush {
       peer = this.libp2p.peerStore.get(opts.peerId);
       if (!peer) throw 'Peer is unknown';
     } else {
-      peer = selectRandomPeer(this.libp2p, LightPushCodec);
+      peer = this.randomPeer;
     }
     if (!peer) throw 'No peer available';
     if (!peer.protocols.includes(LightPushCodec))
@@ -93,4 +94,21 @@ export class WakuLightPush {
     }
     return null;
   }
+
+  /**
+   * Returns known peers from the address book (`libp2p.peerStore`) that support
+   * light push protocol. Waku may or  may not be currently connected to these peers.
+   */
+  get peers(): Peer[] {
+    return getPeersForProtocol(this.libp2p, LightPushCodec);
+  }
+
+  /**
+   * Returns a random peer that supports light push protocol from the address
+   * book (`libp2p.peerStore`). Waku may or  may not be currently connected to
+   * this peer.
+   */
+  get randomPeer(): Peer | undefined {
+    return selectRandomPeer(this.peers);
+  }
 }

src/lib/waku_store/index.spec.ts

@@ -1,12 +1,22 @@
 import { expect } from 'chai';
+import debug from 'debug';
 import TCP from 'libp2p-tcp';
 
-import { makeLogFileName, NimWaku, NOISE_KEY_1 } from '../../test_utils';
+import {
+  makeLogFileName,
+  NimWaku,
+  NOISE_KEY_1,
+  NOISE_KEY_2,
+} from '../../test_utils';
+import { delay } from '../delay';
 import { Waku } from '../waku';
 import { DefaultContentTopic, WakuMessage } from '../waku_message';
+import { generatePrivateKey, getPublicKey } from '../waku_message/version_1';
 
 import { Direction } from './history_rpc';
 
+const dbg = debug('waku:test:store');
+
 describe('Waku Store', () => {
   let waku: Waku;
   let nimWaku: NimWaku;
@@ -133,4 +143,87 @@ describe('Waku Store', () => {
     });
     expect(result).to.not.eq(-1);
   });
+
+  it('Retrieves history with asymmetric encrypted messages', async function () {
+    this.timeout(10_000);
+
+    nimWaku = new NimWaku(makeLogFileName(this));
+    await nimWaku.start({ persistMessages: true, lightpush: true });
+
+    const encryptedMessageText = 'This message is encrypted for me';
+    const clearMessageText =
+      'This is a clear text message for everyone to read';
+    const otherEncMessageText =
+      'This message is not for and I must not be able to read it';
+
+    const privateKey = generatePrivateKey();
+    const publicKey = getPublicKey(privateKey);
+
+    const [encryptedMessage, clearMessage, otherEncMessage] = await Promise.all(
+      [
+        WakuMessage.fromUtf8String(encryptedMessageText, {
+          encPublicKey: publicKey,
+        }),
+        WakuMessage.fromUtf8String(clearMessageText),
+        WakuMessage.fromUtf8String(otherEncMessageText, {
+          encPublicKey: getPublicKey(generatePrivateKey()),
+        }),
+      ]
+    );
+
+    dbg('Messages have been encrypted');
+
+    const [waku1, waku2, nimWakuMultiaddr] = await Promise.all([
+      Waku.create({
+        staticNoiseKey: NOISE_KEY_1,
+        libp2p: { modules: { transport: [TCP] } },
+      }),
+      Waku.create({
+        staticNoiseKey: NOISE_KEY_2,
+        libp2p: { modules: { transport: [TCP] } },
+      }),
+      nimWaku.getMultiaddrWithId(),
+    ]);
+
+    dbg('Waku nodes created');
+
+    await Promise.all([
+      waku1.dial(nimWakuMultiaddr),
+      waku2.dial(nimWakuMultiaddr),
+    ]);
+
+    dbg('Waku nodes connected to nim Waku');
+
+    let lightPushPeers = waku1.lightPush.peers;
+    while (lightPushPeers.length == 0) {
+      await delay(100);
+      lightPushPeers = waku1.lightPush.peers;
+    }
+
+    dbg('Sending messages using light push');
+    await Promise.all([
+      await waku1.lightPush.push(encryptedMessage),
+      waku1.lightPush.push(otherEncMessage),
+      waku1.lightPush.push(clearMessage),
+    ]);
+
+    let storePeers = waku2.store.peers;
+    while (storePeers.length == 0) {
+      await delay(100);
+      storePeers = waku2.store.peers;
+    }
+
+    dbg('Retrieve messages from store');
+    const messages = await waku2.store.queryHistory({
+      contentTopics: [],
+      decryptionPrivateKeys: [privateKey],
+    });
+
+    expect(messages?.length).eq(2);
+    if (!messages) throw 'Length was tested';
+    expect(messages[0].payloadAsUtf8).to.eq(clearMessageText);
+    expect(messages[1].payloadAsUtf8).to.eq(encryptedMessageText);
+
+    await Promise.all([waku1.stop(), waku2.stop()]);
+  });
 });

src/lib/waku_store/index.ts

@@ -1,15 +1,19 @@
+import debug from 'debug';
 import concat from 'it-concat';
 import lp from 'it-length-prefixed';
 import pipe from 'it-pipe';
 import Libp2p from 'libp2p';
+import { Peer } from 'libp2p/src/peer-store';
 import PeerId from 'peer-id';
 
-import { selectRandomPeer } from '../select_peer';
+import { getPeersForProtocol, selectRandomPeer } from '../select_peer';
 import { WakuMessage } from '../waku_message';
 import { DefaultPubsubTopic } from '../waku_relay';
 
 import { Direction, HistoryRPC } from './history_rpc';
 
+const dbg = debug('waku:store');
+
 export const StoreCodec = '/vac/waku/store/2.0.0-beta3';
 
 export { Direction };
@@ -33,6 +37,7 @@ export interface QueryOptions {
   direction?: Direction;
   pageSize?: number;
   callback?: (messages: WakuMessage[]) => void;
+  decryptionPrivateKeys?: Uint8Array[];
 }
 
 /**
@@ -70,13 +75,14 @@ export class WakuStore {
       },
       options
     );
+    dbg('Querying history with the following options', options);
 
     let peer;
     if (opts.peerId) {
       peer = this.libp2p.peerStore.get(opts.peerId);
       if (!peer) throw 'Peer is unknown';
     } else {
-      peer = selectRandomPeer(this.libp2p, StoreCodec);
+      peer = this.randomPeer;
     }
     if (!peer) throw 'No peer available';
     if (!peer.protocols.includes(StoreCodec))
@@ -114,10 +120,17 @@ export class WakuStore {
               return messages;
             }
 
+            dbg(
+              `${response.messages.length} messages retrieved for pubsub topic ${opts.pubsubTopic}`
+            );
+
             const pageMessages: WakuMessage[] = [];
             await Promise.all(
               response.messages.map(async (protoMsg) => {
-                const msg = await WakuMessage.decodeProto(protoMsg);
+                const msg = await WakuMessage.decodeProto(
+                  protoMsg,
+                  opts.decryptionPrivateKeys
+                );
 
                 if (msg) {
                   messages.push(msg);
@@ -164,4 +177,21 @@ export class WakuStore {
       }
     }
   }
+
+  /**
+   * Returns known peers from the address book (`libp2p.peerStore`) that support
+   * store protocol. Waku may or  may not be currently connected to these peers.
+   */
+  get peers(): Peer[] {
+    return getPeersForProtocol(this.libp2p, StoreCodec);
+  }
+
+  /**
+   * Returns a random peer that supports store protocol from the address
+   * book (`libp2p.peerStore`). Waku may or  may not be currently connected to
+   * this peer.
+   */
+  get randomPeer(): Peer | undefined {
+    return selectRandomPeer(this.peers);
+  }
 }