finalize multi-device

WASignalGroup/group_session_builder.js

@@ -0,0 +1,51 @@
+//const utils = require('../../common/utils');
+const SenderKeyDistributionMessage = require('./sender_key_distribution_message');
+
+const keyhelper = require("libsignal/src/keyhelper");
+class GroupSessionBuilder {
+  constructor(senderKeyStore) {
+    this.senderKeyStore = senderKeyStore;
+  }
+
+  async process(senderKeyName, senderKeyDistributionMessage) {
+    //console.log('GroupSessionBuilder process', senderKeyName, senderKeyDistributionMessage);
+    const senderKeyRecord = await this.senderKeyStore.loadSenderKey(senderKeyName);
+    senderKeyRecord.addSenderKeyState(
+      senderKeyDistributionMessage.getId(),
+      senderKeyDistributionMessage.getIteration(),
+      senderKeyDistributionMessage.getChainKey(),
+      senderKeyDistributionMessage.getSignatureKey()
+    );
+    await this.senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
+  }
+
+  // [{"senderKeyId":1742199468,"senderChainKey":{"iteration":0,"seed":"yxMY9VFQcXEP34olRAcGCtsgx1XoKsHfDIh+1ea4HAQ="},"senderSigningKey":{"public":""}}]
+  async create(senderKeyName) {
+    try {
+      const senderKeyRecord = await this.senderKeyStore.loadSenderKey(senderKeyName);
+      //console.log('GroupSessionBuilder create session', senderKeyName, senderKeyRecord);
+
+      if (senderKeyRecord.isEmpty()) {
+        const keyId = keyhelper.generateSenderKeyId();
+        const senderKey = keyhelper.generateSenderKey();
+        const signingKey = keyhelper.generateSenderSigningKey();
+
+        senderKeyRecord.setSenderKeyState(keyId, 0, senderKey, signingKey);
+        await this.senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord);
+      }
+
+      const state = senderKeyRecord.getSenderKeyState();
+
+      return new SenderKeyDistributionMessage(
+        state.getKeyId(),
+        state.getSenderChainKey().getIteration(),
+        state.getSenderChainKey().getSeed(),
+        state.getSigningKeyPublic()
+      );
+    } catch (e) {
+      //console.log(e.stack);
+      throw new Error(e);
+    }
+  }
+}
+module.exports = GroupSessionBuilder;