Supports assigning App IDs to multiple app groups

Author: rileytestut

AltSign/Apple API/ALTAppleAPI.h

@@ -71,8 +71,8 @@ NS_SWIFT_NAME(revoke(_:for:session:completionHandler:));
 - (void)addAppGroupWithName:(NSString *)name groupIdentifier:(NSString *)groupIdentifier team:(ALTTeam *)team session:(ALTAppleAPISession *)session
        completionHandler:(void (^)(ALTAppGroup *_Nullable group, NSError *_Nullable error))completionHandler;
 
-- (void)addAppID:(ALTAppID *)appID toGroup:(ALTAppGroup *)group team:(ALTTeam *)team session:(ALTAppleAPISession *)session
-completionHandler:(void (^)(BOOL success, NSError *_Nullable error))completionHandler;
+- (void)assignAppID:(ALTAppID *)appID toGroups:(NSArray<ALTAppGroup *> *)groups team:(ALTTeam *)team session:(ALTAppleAPISession *)session
+  completionHandler:(void (^)(BOOL success, NSError *_Nullable error))completionHandler;
 
 /* Provisioning Profiles */
 - (void)fetchProvisioningProfileForAppID:(ALTAppID *)appID team:(ALTTeam *)team session:(ALTAppleAPISession *)session

AltSign/Apple API/ALTAppleAPI.m

@@ -541,11 +541,18 @@ - (void)addAppGroupWithName:(NSString *)name groupIdentifier:(NSString *)groupId
     }];
 }
 
-- (void)addAppID:(ALTAppID *)appID toGroup:(ALTAppGroup *)group team:(ALTTeam *)team session:(ALTAppleAPISession *)session completionHandler:(void (^)(BOOL, NSError * _Nullable))completionHandler
+- (void)assignAppID:(ALTAppID *)appID toGroups:(NSArray<ALTAppGroup *> *)groups team:(ALTTeam *)team session:(ALTAppleAPISession *)session
+  completionHandler:(void (^)(BOOL success, NSError *_Nullable error))completionHandler
 {
     NSURL *URL = [NSURL URLWithString:@"ios/assignApplicationGroupToAppId.action" relativeToURL:self.baseURL];
 
-    [self sendRequestWithURL:URL additionalParameters:@{@"appIdId": appID.identifier, @"applicationGroups": group.identifier}
+    NSMutableArray *groupIDs = [NSMutableArray arrayWithCapacity:groups.count];
+    for (ALTAppGroup *group in groups)
+    {
+        [groupIDs addObject:group.identifier];
+    }
+    
+    [self sendRequestWithURL:URL additionalParameters:@{@"appIdId": appID.identifier, @"applicationGroups": groupIDs}
                      session:session team:team completionHandler:^(NSDictionary *responseDictionary, NSError *requestError) {
         if (responseDictionary == nil)
         {