enable send UD message

Signal/Signal-Info.plist

@@ -7,7 +7,7 @@
 		<key>CarthageVersion</key>
 		<string>0.34.0</string>
 		<key>OSXVersion</key>
-		<string>10.15.1</string>
+		<string>10.15.2</string>
 		<key>WebRTCCommit</key>
 		<string>1445d719bf05280270e9f77576f80f973fd847f8 M73</string>
 	</dict>

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -620,6 +620,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
                      failure:(RetryableFailureHandler)failureHandlerParam
 {
     AssertIsOnSendingQueue();
+    OWSAssert(senderCertificate);
 
     void (^successHandler)(void) = ^() {
         dispatch_async([OWSDispatch sendingQueue], ^{
@@ -958,7 +959,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
     NSString *contactID = messageSend.recipient.recipientId;
     BOOL isGroupMessage = messageSend.thread.isGroupThread;
     BOOL isDeviceLinkMessage = [message isKindOfClass:LKDeviceLinkMessage.class];
-    if (isGroupMessage || isDeviceLinkMessage) {
+    if (isGroupMessage || isDeviceLinkMessage || messageSend.isUDSend) {
         [self sendMessage:messageSend];
     } else {
         BOOL isSilentMessage = message.isSilent || [message isKindOfClass:LKEphemeralMessage.class] || [message isKindOfClass:OWSOutgoingSyncMessage.class];

SignalServiceKit/src/Messages/UD/OWSUDManager.swift

@@ -417,7 +417,8 @@ public class OWSUDManagerImpl: NSObject, OWSUDManager {
 
         // Try to obtain a new sender certificate.
         return firstly {
-            requestSenderCertificate()
+//            requestSenderCertificate()
+            generateSenderCertificate()
         }.map { (certificateData: Data, certificate: SMKSenderCertificate) in
 
             // Cache the current sender certificate.
@@ -426,6 +427,19 @@ public class OWSUDManagerImpl: NSObject, OWSUDManager {
             return certificate
         }
     }
+    
+    private func generateSenderCertificate() -> Promise<(certificateData: Data, certificate: SMKSenderCertificate)> {
+        return Promise<(certificateData: Data, certificate: SMKSenderCertificate)> { seal in
+            //Loki: Generate a sender certifate locally
+            let sender = OWSIdentityManager.shared().identityKeyPair()?.hexEncodedPublicKey
+            let certificate = SMKSenderCertificate(senderDeviceId: OWSDevicePrimaryDeviceId, senderRecipientId: sender!)
+            let certificateData = try certificate.serialized()
+            guard self.isValidCertificate(certificate) else {
+                throw OWSUDError.invalidData(description: "Invalid sender certificate returned by server")
+            }
+            seal.fulfill((certificateData: certificateData, certificate: certificate))
+        }
+    }
 
     private func requestSenderCertificate() -> Promise<(certificateData: Data, certificate: SMKSenderCertificate)> {
         return firstly {