n8n/packages/nodes-base/nodes/Google/Gmail/GenericFunctions.ts
Iván Ovejero 26eac80d49
Parse single-line private key for Google service account (#2132)
*  Parse single-line private key

* ✏️ Update description and placeholder

*  Some improvements

Co-authored-by: Jan Oberhauser <janober@users.noreply.github.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
2021-12-24 16:12:18 +01:00

264 lines
7.2 KiB
TypeScript

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<any> { // 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 ${access_token}`;
//@ts-ignore
return await this.helpers.request(options);
} else {
//@ts-ignore
return await this.helpers.requestOAuth2.call(this, 'gmailOAuth2', options);
}
} catch (error) {
if (error.code === 'ERR_OSSL_PEM_NO_START_LINE') {
error.statusCode = '401';
}
throw new NodeApiError(this.getNode(), error);
}
}
export async function parseRawEmail(this: IExecuteFunctions, messageData: any, dataPropertyNameDownload: string): Promise<INodeExecutionData> { // tslint:disable-line:no-any
const messageEncoded = Buffer.from(messageData.raw, 'base64').toString('utf8');
let responseData = await simpleParser(messageEncoded);
const headers: IDataObject = {};
// @ts-ignore
for (const header of responseData.headerLines) {
headers[header.key] = header.line;
}
// @ts-ignore
responseData.headers = headers;
// @ts-ignore
responseData.headerLines = undefined;
const binaryData: IBinaryKeyData = {};
if (responseData.attachments) {
for (let i = 0; i < responseData.attachments.length; i++) {
const attachment = responseData.attachments[i];
binaryData[`${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,
} 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);
mailBody = await new Promise((resolve) => {
mail.compile().build(async (err: string, result: Buffer) => {
resolve(result);
});
});
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<any> { // 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<IDataObject> {
//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);
}