feat: Add Chat Trigger node (#7409)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Jesper Bylund <mail@jesperbylund.com>
Co-authored-by: OlegIvaniv <me@olegivaniv.com>
Co-authored-by: Deborah <deborah@starfallprojects.co.uk>
Co-authored-by: Jan Oberhauser <janober@users.noreply.github.com>
Co-authored-by: Jon <jonathan.bennetts@gmail.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Michael Kret <88898367+michael-radency@users.noreply.github.com>
Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Mason Geloso <Mason.geloso@gmail.com>
Co-authored-by: Mason Geloso <hone@Masons-Mac-mini.local>
Co-authored-by: Mutasem Aldmour <mutasem@n8n.io>

packages/@n8n/nodes-langchain/nodes/trigger/ChatTrigger/GenericFunctions.ts

@@ -0,0 +1,54 @@
+import type { ICredentialDataDecryptedObject, IWebhookFunctions } from 'n8n-workflow';
+import basicAuth from 'basic-auth';
+import { ChatTriggerAuthorizationError } from './error';
+import type { AuthenticationChatOption } from './types';
+
+export async function validateAuth(context: IWebhookFunctions) {
+	const authentication = context.getNodeParameter('authentication') as AuthenticationChatOption;
+	const req = context.getRequestObject();
+	const headers = context.getHeaderData();
+
+	if (authentication === 'none') {
+		return;
+	} else if (authentication === 'basicAuth') {
+		// Basic authorization is needed to call webhook
+		let expectedAuth: ICredentialDataDecryptedObject | undefined;
+		try {
+			expectedAuth = await context.getCredentials('httpBasicAuth');
+		} catch {}
+
+		if (expectedAuth === undefined || !expectedAuth.user || !expectedAuth.password) {
+			// Data is not defined on node so can not authenticate
+			throw new ChatTriggerAuthorizationError(500, 'No authentication data defined on node!');
+		}
+
+		const providedAuth = basicAuth(req);
+		// Authorization data is missing
+		if (!providedAuth) throw new ChatTriggerAuthorizationError(401);
+
+		if (providedAuth.name !== expectedAuth.user || providedAuth.pass !== expectedAuth.password) {
+			// Provided authentication data is wrong
+			throw new ChatTriggerAuthorizationError(403);
+		}
+	} else if (authentication === 'n8nUserAuth') {
+		const webhookName = context.getWebhookName();
+
+		function getCookie(name: string) {
+			const value = `; ${headers.cookie}`;
+			const parts = value.split(`; ${name}=`);
+
+			if (parts.length === 2) {
+				return parts.pop()?.split(';').shift();
+			}
+			return '';
+		}
+
+		const authCookie = getCookie('n8n-auth');
+		if (!authCookie && webhookName !== 'setup') {
+			// Data is not defined on node so can not authenticate
+			throw new ChatTriggerAuthorizationError(500, 'User not authenticated!');
+		}
+	}
+
+	return;
+}