Add and honor the “CallKit Privacy” setting.

// FREEBIE

Signal/src/call/Speakerbox/CallKitCallManager.swift

@@ -18,12 +18,13 @@ final class CallKitCallManager: NSObject {
 
     let TAG = "[CallKitCallManager]"
     let callController = CXCallController()
+    static let kAnonymousCallHandlePrefix = "Signal:"
 
     // MARK: Actions
 
     func startCall(_ call: SignalCall) {
         let handle = (Environment.getCurrent().preferences.isCallKitPrivacyEnabled()
-            ? CXHandle(type: .generic, value: call.localId.uuidString)
+            ? CXHandle(type: .generic, value: CallKitCallManager.kAnonymousCallHandlePrefix + call.localId.uuidString)
             : CXHandle(type: .phoneNumber, value: call.remotePhoneNumber))
         let startCallAction = CXStartCallAction(call: call.localId, handle: handle)
 

Signal/src/call/Speakerbox/CallKitCallUIAdaptee.swift

@@ -101,7 +101,7 @@ final class CallKitCallUIAdaptee: NSObject, CallUIAdaptee, CXProviderDelegate {
         // Construct a CXCallUpdate describing the incoming call, including the caller.
         let update = CXCallUpdate()
         update.remoteHandle = (Environment.getCurrent().preferences.isCallKitPrivacyEnabled()
-            ? CXHandle(type: .generic, value: call.localId.uuidString)
+            ? CXHandle(type: .generic, value: CallKitCallManager.kAnonymousCallHandlePrefix + call.localId.uuidString)
             : CXHandle(type: .phoneNumber, value: call.remotePhoneNumber))
         update.hasVideo = call.hasLocalVideo
         // Update the name used in the CallKit UI for incoming calls.
@@ -237,7 +237,15 @@ final class CallKitCallUIAdaptee: NSObject, CallUIAdaptee, CXProviderDelegate {
         _ = self.callService.handleOutgoingCall(call)
         action.fulfill()
         self.provider.reportOutgoingCall(with: call.localId, startedConnectingAt: nil)
+        
+        ensureCallName(call:call)
+    }
 
+    func ensureCallName(call : SignalCall) {
+        guard Environment.getCurrent().preferences.isCallKitPrivacyEnabled() else {
+            return;
+        }
+        
         // Update the name used in the CallKit UI for outgoing calls.
         let update = CXCallUpdate()
         update.localizedCallerName = NSLocalizedString("CALLKIT_ANONYMOUS_CONTACT_NAME", comment: "The generic name used for calls if CallKit privacy is enabled")