9d5bcc3c60
This commit introduces a new `clock` field in the `communities_settings` table so that it can be leveraged for syncing community settings across devices. It alsoe exends existing `syncCommunity` APIs to generate `SyncCommunitySettings` as well, avoiding sending additional sync messages for community settings. When editing communities however, we still sync community settings explicitly are we aren't syncing the community itself in that case.
protocol/encryption package
Hash ratchet encryption
encryptor.GenerateHashRatchetKey() generates a hash ratchet key and stores it in in the DB.
There, 2 new tables are created: hash_ratchet_encryption and hash_ratchet_encryption_cache.
Each hash ratchet key is uniquely identified by the (groupId, keyId) pair, where keyId is derived from a clock value.
protocol.BuildHashRatchetKeyExchangeMessage builds an 1-on-1 message containing the hash ratchet key, given it's ID.
protocol.BuildHashRatchetMessage builds a hash ratchet message with arbitrary payload, given groupId. It will use the latest hash ratchet key available. encryptor.encryptWithHR encrypts the payload using Hash Ratchet algorithms. Intermediate hashes are stored in hash_ratchet_encryption_cache table.
protocol.HandleMessage uses encryptor.decryptWithHR fn for decryption.