Can respond to a group membership request

lib/helpers/groups_helper.dart

@@ -286,6 +286,17 @@ class GroupsHelper {
           .addInt("userID", userID)
           .execWithThrow();
 
+  /// Respond to a group membership request
+  ///
+  /// Throws an exception in case of failure
+  static Future<void> respondRequest(
+          int groupID, int userID, bool accept) async =>
+      await APIRequest.withLogin("groups/respond_request")
+          .addInt("groupID", groupID)
+          .addInt("userID", userID)
+          .addBool("accept", accept)
+          .execWithThrow();
+
   /// Turn an API entry into a group object
   Group _getGroupFromAPI(Map<String, dynamic> map) {
     return Group(

lib/ui/screens/group_members_screen.dart

@@ -182,7 +182,7 @@ class __GroupMembershipTileState extends State<_GroupMembershipTile> {
         break;
 
       case GroupMembershipLevel.PENDING:
-        // TODO: Handle this case.
+        return _buildRequestedCase();
         break;
 
       case GroupMembershipLevel.VISITOR:
@@ -211,4 +211,33 @@ class __GroupMembershipTileState extends State<_GroupMembershipTile> {
 
     widget.onUpdated();
   }
+
+  Widget _buildRequestedCase() {
+    return IntrinsicWidth(
+        child: Row(
+      children: <Widget>[
+        MaterialButton(
+          onPressed: () => _respondRequest(false),
+          child: Text(tr("Reject").toUpperCase()),
+          textColor: Colors.red,
+        ),
+        MaterialButton(
+          onPressed: () => _respondRequest(true),
+          child: Text(tr("Accept").toUpperCase()),
+          textColor: Colors.green,
+        )
+      ],
+    ));
+  }
+
+  void _respondRequest(bool accept) async {
+    try {
+      await GroupsHelper.respondRequest(groupID, userID, accept);
+    } catch (e, s) {
+      print("Could not respond to membership request! $e\n$s");
+      showSimpleSnack(context, tr("Could not respond to membership request!"));
+    }
+
+    widget.onUpdated();
+  }
 }