first commit

packages/nodes-base/nodes/Google/Gmail/v2/utils/draft.ts

@@ -0,0 +1,46 @@
+import type { IExecuteFunctions } from 'n8n-workflow';
+
+import type { IEmail } from '@utils/sendAndWait/interfaces';
+
+import { googleApiRequest } from '../../GenericFunctions';
+
+function setEmailReplyHeaders(email: IEmail, messageId: string | undefined): void {
+	if (messageId) {
+		email.inReplyTo = messageId;
+		email.references = messageId;
+	}
+}
+
+function setThreadHeaders(
+	email: IEmail,
+	thread: { messages: Array<{ payload: { headers: Array<{ name: string; value: string }> } }> },
+): void {
+	if (thread?.messages) {
+		const lastMessage = thread.messages.length - 1;
+		const messageId = thread.messages[lastMessage].payload.headers.find(
+			(header: { name: string; value: string }) =>
+				header.name.toLowerCase().includes('message') && header.name.toLowerCase().includes('id'),
+		)?.value;
+
+		setEmailReplyHeaders(email, messageId);
+	}
+}
+
+/**
+ * Adds inReplyTo and reference headers to the email if threadId is provided.
+ */
+export async function addThreadHeadersToEmail(
+	this: IExecuteFunctions,
+	email: IEmail,
+	threadId: string,
+): Promise<void> {
+	const thread = await googleApiRequest.call(
+		this,
+		'GET',
+		`/gmail/v1/users/me/threads/${threadId}`,
+		{},
+		{ format: 'metadata', metadataHeaders: ['Message-ID'] },
+	);
+
+	setThreadHeaders(email, thread);
+}