refactor(core): Parse Webhook request bodies on-demand (#6394)

Also,
1. Consistent CORS support ~on all three webhook types~ waiting webhooks never supported CORS. I'll fix that in another PR
2. [Fixes binary-data handling when request body is text, json, or xml](https://linear.app/n8n/issue/NODE-505/webhook-binary-data-handling-fails-for-textplain-files).
3. Reduced number of middleware that each request has to go through.
4. Removed the need to maintain webhook endpoints in the auth-exception list.
5. Skip all middlewares (apart from `compression`) on Webhook routes. 
6. move `multipart/form-data` support out of individual nodes
7. upgrade `formidable`
8. fix the filenames on binary-data in webhooks nodes
9. add unit tests and integration tests for webhook request handling, and increase test coverage

packages/cli/src/TestWebhooks.ts

@@ -4,14 +4,19 @@ import { Service } from 'typedi';
 import type {
 	IWebhookData,
 	IWorkflowExecuteAdditionalData,
-	WebhookHttpMethod,
+	IHttpRequestMethods,
 	Workflow,
 	WorkflowActivateMode,
 	WorkflowExecuteMode,
 } from 'n8n-workflow';
 
 import { ActiveWebhooks } from '@/ActiveWebhooks';
-import type { IResponseCallbackData, IWorkflowDb } from '@/Interfaces';
+import type {
+	IResponseCallbackData,
+	IWebhookManager,
+	IWorkflowDb,
+	WebhookRequest,
+} from '@/Interfaces';
 import { Push } from '@/push';
 import * as ResponseHelper from '@/ResponseHelper';
 import * as WebhookHelpers from '@/WebhookHelpers';
@@ -21,7 +26,7 @@ const WEBHOOK_TEST_UNREGISTERED_HINT =
 	"Click the 'Execute workflow' button on the canvas, then try again. (In test mode, the webhook only works for one call after you click this button)";
 
 @Service()
-export class TestWebhooks {
+export class TestWebhooks implements IWebhookManager {
 	private testWebhookData: {
 		[key: string]: {
 			sessionId?: string;
@@ -44,14 +49,12 @@ export class TestWebhooks {
 	 * data gets additionally send to the UI. After the request got handled it
 	 * automatically remove the test-webhook.
 	 */
-	async callTestWebhook(
-		httpMethod: WebhookHttpMethod,
-		path: string,
-		request: express.Request,
+	async executeWebhook(
+		request: WebhookRequest,
 		response: express.Response,
 	): Promise<IResponseCallbackData> {
-		// Reset request parameters
-		request.params = {};
+		const httpMethod = request.method;
+		let path = request.params.path;
 
 		// Remove trailing slash
 		if (path.endsWith('/')) {
@@ -82,6 +85,7 @@ export class TestWebhooks {
 			path.split('/').forEach((ele, index) => {
 				if (ele.startsWith(':')) {
 					// write params to req.params
+					// @ts-ignore
 					request.params[ele.slice(1)] = pathElements[index];
 				}
 			});
@@ -157,7 +161,7 @@ export class TestWebhooks {
 	/**
 	 * Gets all request methods associated with a single test webhook
 	 */
-	async getWebhookMethods(path: string): Promise<string[]> {
+	async getWebhookMethods(path: string): Promise<IHttpRequestMethods[]> {
 		const webhookMethods = this.activeWebhooks.getWebhookMethods(path);
 		if (!webhookMethods.length) {
 			// The requested webhook is not registered