[NEW FEATURE] Allows Deletion of message when a messageID is given

src/definition/accessors/IModifyDeleter.ts

@@ -1,3 +1,4 @@
 export interface IModifyDeleter {
     deleteRoom(roomId: string): Promise<void>;
+    deleteMessage(messageId: string): Promise<void>;
 }

src/server/accessors/ModifyDeleter.ts

@@ -7,4 +7,8 @@ export class ModifyDeleter implements IModifyDeleter {
     public async deleteRoom(roomId: string): Promise<void> {
         return this.bridges.getRoomBridge().doDelete(roomId, this.appId);
     }
+
+    public async deleteMessage(messageId: string): Promise<void> {
+        return this.bridges.getMessageBridge().doDelete(messageId, this.appId);
+    }
 }

src/server/bridges/MessageBridge.ts

@@ -47,13 +47,19 @@ export abstract class MessageBridge extends BaseBridge {
             return this.getById(messageId, appId);
         }
     }
+    public async doDelete(messageId: string, appId: string): Promise<void> {
+        if (this.hasDeletePermission(appId)) {
+            return this.delete(messageId, appId);
+        }
+    }
 
     protected abstract create(message: IMessage, appId: string): Promise<string>;
     protected abstract update(message: IMessage, appId: string): Promise<void>;
     protected abstract notifyUser(user: IUser, message: IMessage, appId: string): Promise<void>;
     protected abstract notifyRoom(room: IRoom, message: IMessage, appId: string): Promise<void>;
     protected abstract typing(options: ITypingDescriptor, appId: string): Promise<void>;
     protected abstract getById(messageId: string, appId: string): Promise<IMessage>;
+    protected abstract delete(messageId: string, appId: string): Promise<void>;
 
     private hasReadPermission(appId: string): boolean {
         if (AppPermissionManager.hasPermission(appId, AppPermissions.message.read)) {
@@ -80,4 +86,17 @@ export abstract class MessageBridge extends BaseBridge {
 
         return false;
     }
+
+    private hasDeletePermission(appId: string): boolean {
+        if (AppPermissionManager.hasPermission(appId, AppPermissions.message.delete)) {
+            return true;
+        }
+
+        AppPermissionManager.notifyAboutError(new PermissionDeniedError({
+            appId,
+            missingPermissions: [AppPermissions.message.delete],
+        }));
+
+        return false;
+    }
 }

src/server/permissions/AppPermissions.ts

@@ -40,6 +40,7 @@ export const AppPermissions = {
     'message': {
         read: { name: 'message.read' },
         write: { name: 'message.write' },
+        delete: { name: 'message.delete'},
     },
     'livechat-status': {
         read: { name: 'livechat-status.read' },
@@ -101,6 +102,7 @@ export const defaultPermissions: Array<IPermission> = [
     AppPermissions.room.write,
     AppPermissions.message.read,
     AppPermissions.message.write,
+    AppPermissions.message.delete,
     AppPermissions['livechat-department'].read,
     AppPermissions['livechat-department'].write,
     AppPermissions['livechat-room'].read,

tests/test-data/bridges/messageBridge.ts

@@ -28,4 +28,7 @@ export class TestsMessageBridge extends MessageBridge {
     public typing(options: ITypingDescriptor): Promise<void> {
         throw new Error('Method not implemented.');
     }
+    public delete(messageId: string, appId: string): Promise<void> {
+        throw new Error('Method not implemented.');
+    }
 }