Adding Google Chat node

packages/nodes-base/nodes/Google/Chat/GenericFunctions.ts

@@ -0,0 +1,142 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	ICredentialDataDecryptedObject,
+	ICredentialTestFunctions,
+	IDataObject,
+	NodeApiError,
+	NodeOperationError,
+} from 'n8n-workflow';
+
+import * as moment from 'moment-timezone';
+
+import * as jwt from 'jsonwebtoken';
+
+export async function googleApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, noCredentials = false, encoding?: null | undefined): Promise<any> { // tslint:disable-line:no-any
+
+	const options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/json',
+		},
+		method,
+		body,
+		qs,
+		uri: uri || `https://chat.googleapis.com${resource}`,
+		json: true,
+	};
+
+	if (Object.keys(body).length === 0) {
+		delete options.body;
+	}
+
+	if (encoding === null) {
+		options.encoding = null;
+	}
+
+	try {
+		if (noCredentials) {
+			//@ts-ignore
+			return await this.helpers.request(options);
+		} else{
+			const credentials = await this.getCredentials('googleApi');
+
+			if (credentials === undefined) {
+				throw new NodeOperationError(this.getNode(), 'No credentials got returned!');
+			}
+
+			const { access_token } = await getAccessToken.call(this, credentials as ICredentialDataDecryptedObject);
+			options.headers!.Authorization = `Bearer ${access_token}`;
+
+			//@ts-ignore
+			return await this.helpers.request(options);
+		}
+	} catch (error) {
+		if (error.code === 'ERR_OSSL_PEM_NO_START_LINE') {
+			error.statusCode = '401';
+		}
+		throw new NodeApiError(this.getNode(), error);
+	}
+}
+
+export async function googleApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+
+	const returnData: IDataObject[] = [];
+
+	let responseData;
+	query.pageSize = 100;
+
+	do {
+		responseData = await googleApiRequest.call(this, method, endpoint, body, query);
+		query.pageToken = responseData['nextPageToken'];
+		returnData.push.apply(returnData, responseData[propertyName]);
+	} while (
+		responseData['nextPageToken'] !== undefined &&
+		responseData['nextPageToken'] !== ''
+	);
+
+	return returnData;
+}
+
+export function getAccessToken(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions | ICredentialTestFunctions, credentials: ICredentialDataDecryptedObject): Promise<IDataObject> {
+	//https://developers.google.com/identity/protocols/oauth2/service-account#httprest
+
+	const scopes = [
+		'https://www.googleapis.com/auth/chat.bot',
+	];
+
+	const now = moment().unix();
+
+	const signature = jwt.sign(
+		{
+			'iss': credentials.email as string,
+			'sub': credentials.delegatedEmail || credentials.email as string,
+			'scope': scopes.join(' '),
+			'aud': `https://oauth2.googleapis.com/token`,
+			'iat': now,
+			'exp': now + 3600,
+		},
+		credentials.privateKey as string,
+		{
+			algorithm: 'RS256',
+			header: {
+				'kid': credentials.privateKey as string,
+				'typ': 'JWT',
+				'alg': 'RS256',
+			},
+		},
+	);
+
+	const options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/x-www-form-urlencoded',
+		},
+		method: 'POST',
+		form: {
+			grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
+			assertion: signature,
+		},
+		uri: 'https://oauth2.googleapis.com/token',
+		json: true,
+	};
+
+	//@ts-ignore
+	return this.helpers.request(options);
+}
+
+export function validateJSON(json: string | undefined): any { // tslint:disable-line:no-any
+	let result;
+	try {
+		result = JSON.parse(json!);
+	} catch (exception) {
+		result = undefined;
+	}
+	return result;
+}

packages/nodes-base/nodes/Google/Chat/GoogleChat.node.json

@@ -0,0 +1,27 @@
+{
+	"node": "n8n-nodes-base.googleChat",
+	"nodeVersion": "1.0",
+	"codexVersion": "1.0",
+	"categories": [
+		"Communication"
+	],
+	"resources": {
+		"credentialDocumentation": [
+			{
+				"url": "https://docs.n8n.io/credentials/google"
+			}
+		],
+		"primaryDocumentation": [
+			{
+				"url": "https://docs.n8n.io/nodes/n8n-nodes-base.googleChat/"
+			}
+		],
+		"generic": [
+			{
+				"label": "15 Google apps you can combine and automate to increase productivity",
+				"icon": "💡",
+				"url": "https://n8n.io/blog/automate-google-apps-for-productivity/"
+			}
+		]
+	}
+}