WIP: background vibrate & refresh tasks

Session/Meta/AppDelegate.m

@@ -224,6 +224,10 @@ static NSTimeInterval launchStartedAt;
     OWSLogInfo(@"application: didFinishLaunchingWithOptions completed.");
     
     [self setUpCallHandling];
+    if (@available(iOS 13.0, *)) {
+        [self registerBackgroundTasks];
+    }
+    
 
     return YES;
 }

Session/Meta/AppDelegate.swift

@@ -2,11 +2,13 @@ import PromiseKit
 import WebRTC
 import SessionUIKit
 import UIKit
+import BackgroundTasks
+import SessionUtilitiesKit
 
 extension AppDelegate {
 
-    @objc
+    // MARK: Call handling
-    func setUpCallHandling() {
+    @objc func setUpCallHandling() {
         // Offer messages
         MessageReceiver.handleOfferCallMessage = { message in
             DispatchQueue.main.async {
@@ -45,6 +47,7 @@ extension AppDelegate {
         }
     }
     
+    // MARK: Configuration message
     @objc(syncConfigurationIfNeeded)
     func syncConfigurationIfNeeded() {
         guard Storage.shared.getUser()?.name != nil else { return }
@@ -75,6 +78,7 @@ extension AppDelegate {
         return promise
     }
 
+    // MARK: Closed group poller
     @objc func startClosedGroupPoller() {
         guard OWSIdentityManager.shared().identityKeyPair() != nil else { return }
         ClosedGroupPoller.shared.start()
@@ -84,6 +88,7 @@ extension AppDelegate {
         ClosedGroupPoller.shared.stop()
     }
     
+    // MARK: Theme
     @objc func getAppModeOrSystemDefault() -> AppMode {
         let userDefaults = UserDefaults.standard
         if userDefaults.dictionaryRepresentation().keys.contains("appMode") {
@@ -98,4 +103,46 @@ extension AppDelegate {
         }
     }
     
+    // MARK: Background tasks
+    @available(iOS 13.0, *)
+    @objc func registerBackgroundTasks() {
+        BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.loki-project.loki-messenger.refresh", using: nil) { task in
+            self.handleAppRefresh(task: task as! BGAppRefreshTask)
+        }
+        
+        BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.loki-project.loki-messenger.vibrate", using: nil) { task in
+            Vibration.shared.startVibration()
+            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 60, execute: {
+                Vibration.shared.stopVibrationIfPossible()
+                task.setTaskCompleted(success: true)
+            })
+        }
+    }
+    
+    @available(iOS 13.0, *)
+    @objc func cancelAllPendingBGTask() {
+        BGTaskScheduler.shared.cancelAllTaskRequests()
+    }
+    
+    @available(iOS 13.0, *)
+    @objc func scheduleAppRefresh() {
+        let request = BGAppRefreshTaskRequest(identifier: "com.loki-project.loki-messenger.refresh")
+        // Fetch no earlier than 15 minutes from now.
+        request.earliestBeginDate = Date(timeIntervalSinceNow: 15 * 60)
+                
+        do {
+            try BGTaskScheduler.shared.submit(request)
+        } catch {
+            print("Could not schedule app refresh: \(error)")
+        }
+    }
+    
+    @available(iOS 13.0, *)
+    private func handleAppRefresh(task: BGAppRefreshTask) {
+        // Schedule a new refresh task.
+        scheduleAppRefresh()
+        
+        
+     }
+    
 }

Session/Meta/Session-Info.plist

@@ -2,6 +2,11 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>BGTaskSchedulerPermittedIdentifiers</key>
+	<array>
+		<string>com.loki-project.loki-messenger.vibrate</string>
+		<string>com.loki-project.loki-messenger.refresh</string>
+	</array>
 	<key>BuildDetails</key>
 	<dict>
 		<key>CarthageVersion</key>
@@ -90,7 +95,7 @@
 	<key>NSContactsUsageDescription</key>
 	<string>Signal uses your contacts to find users you know. We do not store your contacts on the server.</string>
 	<key>NSFaceIDUsageDescription</key>
-	<string>Session's Screen Lock feature uses Face ID.</string>
+	<string>Session&apos;s Screen Lock feature uses Face ID.</string>
 	<key>NSMicrophoneUsageDescription</key>
 	<string>Session needs access to your microphone to record media.</string>
 	<key>NSPhotoLibraryAddUsageDescription</key>
@@ -119,6 +124,7 @@
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>fetch</string>
+		<string>processing</string>
 		<string>remote-notification</string>
 	</array>
 	<key>UILaunchStoryboardName</key>
@@ -135,5 +141,7 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<true/>
+	<key>NSHumanReadableCopyright</key>
+	<string>com.loki-project.loki-messenger</string>
 </dict>
 </plist>

SessionNotificationServiceExtension/NotificationServiceExtension.swift

@@ -1,4 +1,5 @@
 import UserNotifications
+import BackgroundTasks
 import SessionMessagingKit
 import SignalUtilitiesKit
 
@@ -93,7 +94,7 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
                         notificationContent.badge = 1
                         notificationContent.title = "Session"
                         notificationContent.body = "\(senderDisplayName) is calling..."
-                        return self.handleSuccess(for: notificationContent)
+                        return self.handleSuccessForIncomingCall(for: notificationContent)
                     default: return self.completeSilenty()
                     }
                     if (senderPublicKey == userPublicKey) {
@@ -119,7 +120,10 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
                     }
                     self.handleSuccess(for: notificationContent)
                 } catch {
-                    self.handleFailure(for: notificationContent)
+                    if let error = error as? MessageReceiver.Error, error.isRetryable {
+                        self.handleFailure(for: notificationContent)
+                    }
+                    self.completeSilenty()
                 }
             }
         }
@@ -209,6 +213,19 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
     private func completeSilenty() {
         contentHandler!(.init())
     }
+    
+    private func handleSuccessForIncomingCall(for content: UNMutableNotificationContent) {
+        // TODO: poll for the real offer, play incoming call ring
+        if #available(iOSApplicationExtension 13.0, *) {
+            let request = BGAppRefreshTaskRequest(identifier: "com.loki-project.loki-messenger.refresh")
+            do {
+                try BGTaskScheduler.shared.submit(request)
+            } catch {
+                print("Could not schedule app refresh: \(error)")
+            }
+        }
+        contentHandler!(content)
+    }
 
     private func handleSuccess(for content: UNMutableNotificationContent) {
         contentHandler!(content)