Quick fix sync transcript duplication

SignalServiceKit/src/Loki/API/LokiAPI.swift

@@ -2,6 +2,7 @@ import PromiseKit
 
 @objc(LKAPI)
 public final class LokiAPI : NSObject {
+    private static var syncMessageTimestamps: [String:Set<UInt64>] = [:]
     public static var lastDeviceLinkUpdate: [String:Date] = [:] // Hex encoded public key to date
     @objc public static var userHexEncodedPublicKeyCache: [String:Set<String>] = [:] // Thread ID to set of user hex encoded public keys
     
@@ -117,7 +118,6 @@ public final class LokiAPI : NSObject {
                 let deviceLinks = storage.getDeviceLinks(for: masterHexEncodedPublicKey, in: transaction)
                 let slaveDestinations = deviceLinks.map { Destination(hexEncodedPublicKey: $0.slave.hexEncodedPublicKey, kind: .slave) }
                 destinations.append(contentsOf: slaveDestinations)
-                destinations = destinations.filter { $0.hexEncodedPublicKey != userHexEncodedPublicKey }
                 seal.fulfill(destinations)
             }
         }
@@ -263,6 +263,14 @@ public final class LokiAPI : NSObject {
             return envelope
         }
     }
+    
+    @objc public static func isDuplicateSyncMessage(_ syncMessage: SSKProtoSyncMessageSent, from hexEncodedPublicKey: String) -> Bool {
+        var timestamps: Set<UInt64> = syncMessageTimestamps[hexEncodedPublicKey] ?? []
+        let result = timestamps.contains(syncMessage.timestamp)
+        timestamps.insert(syncMessage.timestamp)
+        syncMessageTimestamps[hexEncodedPublicKey] = timestamps
+        return result
+    }
 
     // MARK: Message Hash Caching
     private static func getLastMessageHashValue(for target: LokiAPITarget) -> String? {

SignalServiceKit/src/Loki/API/LokiStorageAPI.swift

@@ -27,7 +27,7 @@ public final class LokiStorageAPI : LokiDotNetAPI {
     public static func getDeviceLinks(associatedWith hexEncodedPublicKeys: Set<String>) -> Promise<Set<DeviceLink>> {
         let hexEncodedPublicKeysDescription = "[ \(hexEncodedPublicKeys.joined(separator: ", ")) ]"
         print("[Loki] Getting device links for: \(hexEncodedPublicKeysDescription).")
-        return getAuthToken(for: server).then(on: DispatchQueue.main) { token -> Promise<Set<DeviceLink>> in
+        return getAuthToken(for: server).then(on: DispatchQueue.global()) { token -> Promise<Set<DeviceLink>> in
             let queryParameters = "ids=\(hexEncodedPublicKeys.map { "@\($0)" }.joined(separator: ","))&include_user_annotations=1"
             let url = URL(string: "\(server)/users?\(queryParameters)")!
             let request = TSRequest(url: url)

SignalServiceKit/src/Messages/Interactions/TSMessage.m

@@ -497,7 +497,7 @@ static const NSUInteger OWSMessageSchemaVersion = 4;
 
 #pragma mark - Group Chat
 
-- (BOOL) isGroupChatMessage {
+- (BOOL)isGroupChatMessage {
     return self.groupChatServerID > 0;
 }
 

SignalServiceKit/src/Messages/OWSMessageManager.m

@@ -433,6 +433,12 @@ NS_ASSUME_NONNULL_BEGIN
         }
         OWSLogInfo(@"handling content: <Content: %@>", [self descriptionForContent:contentProto]);
         
+        // Loki: Workaround for duplicate sync transcript issue
+        if (contentProto.syncMessage != nil && contentProto.syncMessage.sent != nil) {
+            BOOL isDuplicate = [LKAPI isDuplicateSyncMessage:contentProto.syncMessage.sent from:envelope.source];
+            if (isDuplicate) { return; }
+        }
+        
         // Loki: Handle device linking message if needed
         if (contentProto.lokiDeviceLinkMessage != nil) {
             NSString *masterHexEncodedPublicKey = contentProto.lokiDeviceLinkMessage.masterHexEncodedPublicKey;