Add messenger extensibility to extensions #753

src/backend/model/extension/ExpressRouterWrapper.ts

@@ -62,14 +62,18 @@ export class ExpressRouteWrapper implements IExtensionRESTRoute {
         },
         RenderingMWs.renderResult
       ])));
-    this.extLogger.silly(`Listening on ${this.func} ${ExtensionManager.EXTENSION_API_PATH}${fullPaths}`);
+    const p = ExtensionManager.EXTENSION_API_PATH + fullPaths;
+    this.extLogger.silly(`Listening on ${this.func} ${p}`);
+    return p;
   }
 
   public rawMiddleware(paths: string[], minRole: UserRoles, mw: (req: Request, res: Response, next: NextFunction) => void | Promise<void>) {
     const fullPaths = paths.map(p => (Utils.concatUrls('/' + this.name + '/' + p)));
     this.router[this.func](fullPaths,
       ...this.getAuthMWs(minRole),
       mw);
-    this.extLogger.silly(`Listening on ${this.func} ${ExtensionManager.EXTENSION_API_PATH}${fullPaths}`);
+    const p = ExtensionManager.EXTENSION_API_PATH + fullPaths;
+    this.extLogger.silly(`Listening on ${this.func} ${p}`);
+    return p;
   }
 }

src/backend/model/extension/ExtensionManager.ts

@@ -4,7 +4,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import {IObjectManager} from '../database/IObjectManager';
 import {Logger} from '../../Logger';
-import {IExtensionEvents, IExtensionObject, IServerExtension} from './IExtension';
+import {IExtensionEvents, IExtensionObject} from './IExtension';
 import {Server} from '../../server';
 import {ExtensionEvent} from './ExtensionEvent';
 import * as express from 'express';
@@ -108,8 +108,8 @@ export class ExtensionManager implements IObjectManager {
 
       if (fs.existsSync(packageJsonPath)) {
         Logger.silly(LOG_TAG, `Running: "npm install --omit=dev" in ${extPath}`);
-        await exec('npm install --omit=dev' ,{
-          cwd:extPath
+        await exec('npm install --omit=dev', {
+          cwd: extPath
         });
         // eslint-disable-next-line @typescript-eslint/no-var-requires
         const pkg = require(packageJsonPath);
@@ -138,8 +138,9 @@ export class ExtensionManager implements IObjectManager {
       const ext = require(serverExt);
       if (typeof ext?.cleanUp === 'function') {
         Logger.debug(LOG_TAG, 'Running Init on extension:' + extObj.extensionName);
-        await ext?.cleanUp(ext);
+        await ext?.cleanUp(extObj);
       }
+      extObj.messengers.cleanUp();
     }
   }
 

src/backend/model/extension/ExtensionMessengerHandler.ts

@@ -0,0 +1,31 @@
+import {IExtensionMessengers} from './IExtension';
+import {DynamicConfig} from '../../../common/entities/DynamicConfig';
+import {MediaDTOWithThPath, Messenger} from '../messenger/Messenger';
+import {ExtensionMessenger} from '../messenger/ExtensionMessenger';
+import {MessengerRepository} from '../messenger/MessengerRepository';
+import {ILogger} from '../../Logger';
+
+export class ExtensionMessengerHandler implements IExtensionMessengers {
+
+  messengers: Messenger[] = [];
+
+
+  constructor(private readonly extLogger: ILogger) {
+  }
+
+
+  addMessenger<C extends Record<string, unknown>>(name: string, config: DynamicConfig[], callbacks: {
+    sendMedia: (config: C, media: MediaDTOWithThPath[]) => Promise<void>
+  }): void {
+    this.extLogger.silly('Adding new Messenger:', name);
+    const em = new ExtensionMessenger(name, config, callbacks);
+    this.messengers.push(em);
+    MessengerRepository.Instance.register(em);
+  }
+
+  cleanUp() {
+    this.extLogger.silly('Removing Messenger');
+    this.messengers.forEach(m => MessengerRepository.Instance.remove(m));
+  }
+
+}

src/backend/model/extension/ExtensionObject.ts

@@ -6,6 +6,7 @@ import {ProjectPath} from '../../ProjectPath';
 import {ExpressRouterWrapper} from './ExpressRouterWrapper';
 import {createLoggerWrapper} from '../../Logger';
 import * as express from 'express';
+import {ExtensionMessengerHandler} from './ExtensionMessengerHandler';
 
 export class ExtensionObject<C> implements IExtensionObject<C> {
 
@@ -16,6 +17,7 @@ export class ExtensionObject<C> implements IExtensionObject<C> {
   public readonly Logger;
   public readonly events;
   public readonly RESTApi;
+  public readonly messengers;
 
   constructor(public readonly extensionId: string,
               public readonly extensionName: string,
@@ -30,6 +32,7 @@ export class ExtensionObject<C> implements IExtensionObject<C> {
     this.Logger = logger;
     this.events = events;
     this.RESTApi = new ExpressRouterWrapper(extensionRouter, extensionId, logger);
+    this.messengers = new ExtensionMessengerHandler(logger);
   }
 
 }

src/backend/model/extension/IExtension.ts

@@ -7,6 +7,8 @@ import {ILogger} from '../../Logger';
 import {UserDTO, UserRoles} from '../../../common/entities/UserDTO';
 import {ParamsDictionary} from 'express-serve-static-core';
 import {Connection} from 'typeorm';
+import {DynamicConfig} from '../../../common/entities/DynamicConfig';
+import {MediaDTOWithThPath} from '../messenger/Messenger';
 
 
 export type IExtensionBeforeEventHandler<I, O> = (input: { inputs: I }, event: { stopPropagation: boolean }) => Promise<{ inputs: I } | O>;
@@ -69,16 +71,18 @@ export interface IExtensionRESTRoute {
    * @param paths RESTapi path, relative to the extension base endpoint
    * @param minRole set to null to omit auer check (ie make the endpoint public)
    * @param cb function callback
+   * @return newly added REST api path
    */
-  jsonResponse(paths: string[], minRole: UserRoles, cb: (params?: ParamsDictionary, body?: any, user?: UserDTO) => Promise<unknown> | unknown): void;
+  jsonResponse(paths: string[], minRole: UserRoles, cb: (params?: ParamsDictionary, body?: any, user?: UserDTO) => Promise<unknown> | unknown): string;
 
   /**
    * Exposes a standard expressjs middleware
    * @param paths RESTapi path, relative to the extension base endpoint
    * @param minRole set to null to omit auer check (ie make the endpoint public)
    * @param mw expressjs middleware
+   * @return newly added REST api path
    */
-  rawMiddleware(paths: string[], minRole: UserRoles, mw: (req: Request, res: Response, next: NextFunction) => void | Promise<void>): void;
+  rawMiddleware(paths: string[], minRole: UserRoles, mw: (req: Request, res: Response, next: NextFunction) => void | Promise<void>): string;
 }
 
 export interface IExtensionRESTApi {
@@ -116,9 +120,21 @@ export interface IExtensionConfig<C> {
   getConfig(): C;
 }
 
+export interface IExtensionMessengers {
+  /**
+   * Adds a new messenger that the user can select e.g.: for sending top pick photos
+   * @param name Name of the messenger (also used as id)
+   * @param config config metadata for this messenger
+   * @param callbacks messenger logic
+   */
+  addMessenger<C extends Record<string, unknown> = Record<string, unknown>>(name: string, config: DynamicConfig[], callbacks: {
+    sendMedia: (config: C, media: MediaDTOWithThPath[]) => Promise<void>
+  }): void;
+}
+
 export interface IExtensionObject<C> {
   /**
-   * ID of the extension that is internally used. By default the name and ID matches if there is no collision.
+   * ID of the extension that is internally used. By default, the name and ID matches if there is no collision.
    */
   extensionId: string,
 
@@ -159,6 +175,13 @@ export interface IExtensionObject<C> {
    * Use this to define REST calls related to the extension
    */
   RESTApi: IExtensionRESTApi;
+
+  /**
+   * Object to manipulate messengers.
+   * Messengers are used to send messages (like emails) from the app.
+   * One type of message is a list of selected photos.
+   */
+  messengers: IExtensionMessengers;
 }
 
 

src/backend/model/messenger/ExtensionMessenger.ts

@@ -0,0 +1,15 @@
+import {MediaDTOWithThPath, Messenger} from './Messenger';
+import {DynamicConfig} from '../../../common/entities/DynamicConfig';
+
+export class ExtensionMessenger<C extends Record<string, unknown> = Record<string, unknown>> extends Messenger<C> {
+
+  constructor(public readonly Name: string,
+              public readonly ConfigTemplate: DynamicConfig[],
+              private readonly callbacks: { sendMedia: (config: C, media: MediaDTOWithThPath[]) => Promise<void> }) {
+    super();
+  }
+
+  protected sendMedia(config: C, media: MediaDTOWithThPath[]): Promise<void> {
+    return this.callbacks.sendMedia(config, media);
+  }
+}

src/backend/model/messenger/MessengerRepository.ts

@@ -18,6 +18,13 @@ export class MessengerRepository {
     return Object.values(this.messengers);
   }
 
+  remove(m: Messenger<Record<string, unknown>>): void {
+    if (!this.messengers[m.Name]) {
+      throw new Error('Messenger does not exist:' + m.Name);
+    }
+    delete this.messengers[m.Name];
+  }
+
   register(msgr: Messenger): void {
     if (typeof this.messengers[msgr.Name] !== 'undefined') {
       throw new Error('Messenger already exist:' + msgr.Name);