import { OptionsWithUri, } from 'request'; import { IExecuteFunctions, IExecuteSingleFunctions, ILoadOptionsFunctions, } from 'n8n-core'; import { IDataObject, } 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, headers: IDataObject = {}): Promise { // tslint:disable-line:no-any const authenticationMethod = this.getNodeParameter('authentication', 0, 'serviceAccount') as string; const options: OptionsWithUri = { headers: { 'Content-Type': 'application/json', }, method, body, qs, uri: uri || `https://www.googleapis.com/books/${resource}`, json: true, }; try { if (Object.keys(headers).length !== 0) { options.headers = Object.assign({}, options.headers, headers); } if (Object.keys(body).length === 0) { delete options.body; } if (authenticationMethod === 'serviceAccount') { const credentials = this.getCredentials('googleApi'); if (credentials === undefined) { throw new Error('No credentials got returned!'); } const { access_token } = await getAccessToken.call(this, credentials as IDataObject); options.headers!.Authorization = `Bearer ${access_token}`; //@ts-ignore return await this.helpers.request(options); } else { //@ts-ignore return await this.helpers.requestOAuth2.call(this, 'googleBooksOAuth2Api', options); } } catch (error) { if (error.response && error.response.body && error.response.body.error) { let errors; if (error.response.body.error.errors) { errors = error.response.body.error.errors; errors = errors.map((e: IDataObject) => e.message).join('|'); } else { errors = error.response.body.error.message; } // Try to return the error prettier throw new Error( `Google Books error response [${error.statusCode}]: ${errors}`, ); } throw error; } } 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 = 40; do { responseData = await googleApiRequest.call(this, method, endpoint, body, query); returnData.push.apply(returnData, responseData[propertyName] || []); } while ( returnData.length < responseData.totalItems ); return returnData; } function getAccessToken(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, credentials: IDataObject): Promise { //https://developers.google.com/identity/protocols/oauth2/service-account#httprest const scopes = [ 'https://www.googleapis.com/auth/books', ]; 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); }