import { OptionsWithUri, } from 'request'; import { simpleParser, } from 'mailparser'; import { IExecuteFunctions, IExecuteSingleFunctions, ILoadOptionsFunctions, } from 'n8n-core'; import { IBinaryKeyData, IDataObject, INodeExecutionData, NodeApiError, NodeOperationError, } from 'n8n-workflow'; import { IEmail, } from './Gmail.node'; import * as moment from 'moment-timezone'; import * as jwt from 'jsonwebtoken'; interface IGoogleAuthCredentials { delegatedEmail?: string; email: string; inpersonate: boolean; privateKey: string; } const mailComposer = require('nodemailer/lib/mail-composer'); export async function googleApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, endpoint: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise { // tslint:disable-line:no-any const authenticationMethod = this.getNodeParameter('authentication', 0, 'serviceAccount') as string; let options: OptionsWithUri = { headers: { 'Accept': 'application/json', 'Content-Type': 'application/json', }, method, body, qs, uri: uri || `https://www.googleapis.com${endpoint}`, qsStringifyOptions: { arrayFormat: 'repeat', }, json: true, }; options = Object.assign({}, options, option); try { if (Object.keys(body).length === 0) { delete options.body; } if (authenticationMethod === 'serviceAccount') { 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 unknown as IGoogleAuthCredentials); options.headers!.Authorization = `Bearer ${access_token}`; //@ts-ignore return await this.helpers.request(options); } else { //@ts-ignore return await this.helpers.requestOAuth2.call(this, 'gmailOAuth2', options); } } catch (error) { if (error.code === 'ERR_OSSL_PEM_NO_START_LINE') { error.statusCode = '401'; } throw new NodeApiError(this.getNode(), error); } } export async function parseRawEmail(this: IExecuteFunctions, messageData: any, dataPropertyNameDownload: string): Promise { // tslint:disable-line:no-any const messageEncoded = Buffer.from(messageData.raw, 'base64').toString('utf8'); let responseData = await simpleParser(messageEncoded); const headers: IDataObject = {}; // @ts-ignore for (const header of responseData.headerLines) { headers[header.key] = header.line; } // @ts-ignore responseData.headers = headers; // @ts-ignore responseData.headerLines = undefined; const binaryData: IBinaryKeyData = {}; if (responseData.attachments) { for (let i = 0; i < responseData.attachments.length; i++) { const attachment = responseData.attachments[i]; binaryData[`${dataPropertyNameDownload}${i}`] = await this.helpers.prepareBinaryData(attachment.content, attachment.filename, attachment.contentType); } // @ts-ignore responseData.attachments = undefined; } const mailBaseData: IDataObject = {}; const resolvedModeAddProperties = [ 'id', 'threadId', 'labelIds', 'sizeEstimate', ]; for (const key of resolvedModeAddProperties) { // @ts-ignore mailBaseData[key] = messageData[key]; } responseData = Object.assign(mailBaseData, responseData); return { json: responseData as unknown as IDataObject, binary: Object.keys(binaryData).length ? binaryData : undefined, } as INodeExecutionData; } //------------------------------------------------------------------------------------------------------------------------------------------ // This function converts an email object into a MIME encoded email and then converts that string into base64 encoding // for more info on MIME, https://docs.microsoft.com/en-us/previous-versions/office/developer/exchange-server-2010/aa494197(v%3Dexchg.140) //------------------------------------------------------------------------------------------------------------------------------------------ export async function encodeEmail(email: IEmail) { let mailBody: Buffer; const mailOptions = { from: email.from, to: email.to, cc: email.cc, bcc: email.bcc, replyTo: email.inReplyTo, references: email.reference, subject: email.subject, text: email.body, keepBcc: true, } as IDataObject; if (email.htmlBody) { mailOptions.html = email.htmlBody; } if (email.attachments !== undefined && Array.isArray(email.attachments) && email.attachments.length > 0) { const attachments = email.attachments.map((attachment) => ({ filename: attachment.name, content: attachment.content, contentType: attachment.type, encoding: 'base64', })); mailOptions.attachments = attachments; } const mail = new mailComposer(mailOptions).compile(); // by default the bcc headers are deleted when the mail is built. // So add keepBcc flag to averride such behaviour. Only works when // the flag is set after the compilation. //https://nodemailer.com/extras/mailcomposer/#bcc mail.keepBcc = true; mailBody = await mail.build(); return mailBody.toString('base64').replace(/\+/g, '-').replace(/\//g, '_'); } export async function googleApiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions, propertyName: string, method: string, endpoint: string, body: any = {}, query: IDataObject = {}): Promise { // tslint:disable-line:no-any const returnData: IDataObject[] = []; let responseData; query.maxResults = 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 extractEmail(s: string) { const data = s.split('<')[1]; return data.substring(0, data.length - 1); } function getAccessToken(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, credentials: IGoogleAuthCredentials): Promise { //https://developers.google.com/identity/protocols/oauth2/service-account#httprest const scopes = [ 'https://www.googleapis.com/auth/gmail.labels', 'https://www.googleapis.com/auth/gmail.addons.current.action.compose', 'https://www.googleapis.com/auth/gmail.addons.current.message.action', 'https://mail.google.com/', 'https://www.googleapis.com/auth/gmail.modify', 'https://www.googleapis.com/auth/gmail.compose', ]; const now = moment().unix(); credentials.email = credentials.email.trim(); const privateKey = (credentials.privateKey as string).replace(/\\n/g, '\n').trim(); 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, }, privateKey, { algorithm: 'RS256', header: { 'kid': privateKey, '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); }