Add notificationBodyLocalizationKey to MXKAppSettings.

MatrixKit/Models/Account/MXKAccount.m

@@ -1241,10 +1241,12 @@ - (void)enableAPNSPusher:(BOOL)enabled success:(void (^)(void))success failure:(
     NSString *appId = [[NSUserDefaults standardUserDefaults] objectForKey:@"pusherAppIdProd"];
 #endif
 
+    NSString *locKey = MXKAppSettings.standardAppSettings.notificationBodyLocalizationKey;
+
     NSDictionary *pushData = @{
         @"url": self.pushGatewayURL,
         @"format": @"event_id_only",
-        @"default_payload": @{@"aps": @{@"mutable-content": @(1), @"alert": @{@"loc-key": @"MESSAGE", @"loc-args": @[]}}}
+        @"default_payload": @{@"aps": @{@"mutable-content": @(1), @"alert": @{@"loc-key": locKey, @"loc-args": @[]}}}
     };
 
     [self enablePusher:enabled appId:appId token:[MXKAccountManager sharedManager].apnsDeviceToken pushData:pushData success:^{

MatrixKit/Models/MXKAppSettings.h

@@ -202,11 +202,22 @@ typedef NS_ENUM(NSUInteger, MXKKeyPreSharingStrategy)
  */
 @property (nonatomic) UIColor *presenceColorForOfflineUser;
 
-#pragma mark - Push
+#pragma mark - Notifications
 
 /// Flag to allow PushKit pushers or not. Default value is `NO`.
 @property (nonatomic, assign) BOOL allowPushKitPushers;
 
+/**
+ A localization key used when registering the default notification payload.
+ This key will be translated and displayed for APNS notifications as the body
+ content, unless it is modified locally by a Notification Service Extension.
+
+ The default value for this setting is "MESSAGE". Changes are *not* persisted.
+ Updating the value after MXKAccount has called `enableAPNSPusher:success:failure:`
+ will have no effect.
+ */
+@property (nonatomic) NSString *notificationBodyLocalizationKey;
+
 #pragma mark - Calls
 
 /**

MatrixKit/Models/MXKAppSettings.m

@@ -120,6 +120,7 @@ -(instancetype)init
         httpsLinkScheme = @"https";
 
         _allowPushKitPushers = NO;
+        _notificationBodyLocalizationKey = @"MESSAGE";
         enableCallKit = YES;
 
         eventsFilterForMessages = [NSMutableArray arrayWithArray:@[

changelog.d/4132.change

@@ -0,0 +1 @@
+Notifications: Add notificationBodyLocalizationKey to MXKAppSettings to customise the default notification payload.