feat: Add request context middleware for config and dependency injection in hooks (#8480)

src/ParseServer.ts

@@ -279,6 +279,18 @@ class ParseServer {
     }
   }
 
+  /**
+   * @static
+   * Allow developers to customize each request with inversion of control/dependency injection
+   */
+  static applyRequestContextMiddleware(api, options) {
+    if (options.requestContextMiddleware) {
+      if (typeof options.requestContextMiddleware !== 'function') {
+        throw new Error('requestContextMiddleware must be a function');
+      }
+      api.use(options.requestContextMiddleware);
+    }
+  }
   /**
    * @static
    * Create an express app for the parse server
@@ -326,7 +338,7 @@ class ParseServer {
       middlewares.addRateLimit(route, options);
     }
     api.use(middlewares.handleParseSession);
-
+    this.applyRequestContextMiddleware(api, options);
     const appRouter = ParseServer.promiseRouter({ appId });
     api.use(appRouter.expressRouter());