This repository has been archived on 2024-09-11. You can view files and clone it, but cannot push or open issues or pull requests.
svrjs-blog-newsletter/cronjob/node_modules/nodemailer/lib/xoauth2/index.js
2024-05-26 22:54:55 +02:00

376 lines
13 KiB
JavaScript
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

'use strict';
const Stream = require('stream').Stream;
const nmfetch = require('../fetch');
const crypto = require('crypto');
const shared = require('../shared');
/**
* XOAUTH2 access_token generator for Gmail.
* Create client ID for web applications in Google API console to use it.
* See Offline Access for receiving the needed refreshToken for an user
* https://developers.google.com/accounts/docs/OAuth2WebServer#offline
*
* Usage for generating access tokens with a custom method using provisionCallback:
* provisionCallback(user, renew, callback)
* * user is the username to get the token for
* * renew is a boolean that if true indicates that existing token failed and needs to be renewed
* * callback is the callback to run with (error, accessToken [, expires])
* * accessToken is a string
* * expires is an optional expire time in milliseconds
* If provisionCallback is used, then Nodemailer does not try to attempt generating the token by itself
*
* @constructor
* @param {Object} options Client information for token generation
* @param {String} options.user User e-mail address
* @param {String} options.clientId Client ID value
* @param {String} options.clientSecret Client secret value
* @param {String} options.refreshToken Refresh token for an user
* @param {String} options.accessUrl Endpoint for token generation, defaults to 'https://accounts.google.com/o/oauth2/token'
* @param {String} options.accessToken An existing valid accessToken
* @param {String} options.privateKey Private key for JSW
* @param {Number} options.expires Optional Access Token expire time in ms
* @param {Number} options.timeout Optional TTL for Access Token in seconds
* @param {Function} options.provisionCallback Function to run when a new access token is required
*/
class XOAuth2 extends Stream {
constructor(options, logger) {
super();
this.options = options || {};
if (options && options.serviceClient) {
if (!options.privateKey || !options.user) {
setImmediate(() => this.emit('error', new Error('Options "privateKey" and "user" are required for service account!')));
return;
}
let serviceRequestTimeout = Math.min(Math.max(Number(this.options.serviceRequestTimeout) || 0, 0), 3600);
this.options.serviceRequestTimeout = serviceRequestTimeout || 5 * 60;
}
this.logger = shared.getLogger(
{
logger
},
{
component: this.options.component || 'OAuth2'
}
);
this.provisionCallback = typeof this.options.provisionCallback === 'function' ? this.options.provisionCallback : false;
this.options.accessUrl = this.options.accessUrl || 'https://accounts.google.com/o/oauth2/token';
this.options.customHeaders = this.options.customHeaders || {};
this.options.customParams = this.options.customParams || {};
this.accessToken = this.options.accessToken || false;
if (this.options.expires && Number(this.options.expires)) {
this.expires = this.options.expires;
} else {
let timeout = Math.max(Number(this.options.timeout) || 0, 0);
this.expires = (timeout && Date.now() + timeout * 1000) || 0;
}
}
/**
* Returns or generates (if previous has expired) a XOAuth2 token
*
* @param {Boolean} renew If false then use cached access token (if available)
* @param {Function} callback Callback function with error object and token string
*/
getToken(renew, callback) {
if (!renew && this.accessToken && (!this.expires || this.expires > Date.now())) {
return callback(null, this.accessToken);
}
let generateCallback = (...args) => {
if (args[0]) {
this.logger.error(
{
err: args[0],
tnx: 'OAUTH2',
user: this.options.user,
action: 'renew'
},
'Failed generating new Access Token for %s',
this.options.user
);
} else {
this.logger.info(
{
tnx: 'OAUTH2',
user: this.options.user,
action: 'renew'
},
'Generated new Access Token for %s',
this.options.user
);
}
callback(...args);
};
if (this.provisionCallback) {
this.provisionCallback(this.options.user, !!renew, (err, accessToken, expires) => {
if (!err && accessToken) {
this.accessToken = accessToken;
this.expires = expires || 0;
}
generateCallback(err, accessToken);
});
} else {
this.generateToken(generateCallback);
}
}
/**
* Updates token values
*
* @param {String} accessToken New access token
* @param {Number} timeout Access token lifetime in seconds
*
* Emits 'token': { user: User email-address, accessToken: the new accessToken, timeout: TTL in seconds}
*/
updateToken(accessToken, timeout) {
this.accessToken = accessToken;
timeout = Math.max(Number(timeout) || 0, 0);
this.expires = (timeout && Date.now() + timeout * 1000) || 0;
this.emit('token', {
user: this.options.user,
accessToken: accessToken || '',
expires: this.expires
});
}
/**
* Generates a new XOAuth2 token with the credentials provided at initialization
*
* @param {Function} callback Callback function with error object and token string
*/
generateToken(callback) {
let urlOptions;
let loggedUrlOptions;
if (this.options.serviceClient) {
// service account - https://developers.google.com/identity/protocols/OAuth2ServiceAccount
let iat = Math.floor(Date.now() / 1000); // unix time
let tokenData = {
iss: this.options.serviceClient,
scope: this.options.scope || 'https://mail.google.com/',
sub: this.options.user,
aud: this.options.accessUrl,
iat,
exp: iat + this.options.serviceRequestTimeout
};
let token;
try {
token = this.jwtSignRS256(tokenData);
} catch (err) {
return callback(new Error('Can\x27t generate token. Check your auth options'));
}
urlOptions = {
grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
assertion: token
};
loggedUrlOptions = {
grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
assertion: tokenData
};
} else {
if (!this.options.refreshToken) {
return callback(new Error('Can\x27t create new access token for user'));
}
// web app - https://developers.google.com/identity/protocols/OAuth2WebServer
urlOptions = {
client_id: this.options.clientId || '',
client_secret: this.options.clientSecret || '',
refresh_token: this.options.refreshToken,
grant_type: 'refresh_token'
};
loggedUrlOptions = {
client_id: this.options.clientId || '',
client_secret: (this.options.clientSecret || '').substr(0, 6) + '...',
refresh_token: (this.options.refreshToken || '').substr(0, 6) + '...',
grant_type: 'refresh_token'
};
}
Object.keys(this.options.customParams).forEach(key => {
urlOptions[key] = this.options.customParams[key];
loggedUrlOptions[key] = this.options.customParams[key];
});
this.logger.debug(
{
tnx: 'OAUTH2',
user: this.options.user,
action: 'generate'
},
'Requesting token using: %s',
JSON.stringify(loggedUrlOptions)
);
this.postRequest(this.options.accessUrl, urlOptions, this.options, (error, body) => {
let data;
if (error) {
return callback(error);
}
try {
data = JSON.parse(body.toString());
} catch (E) {
return callback(E);
}
if (!data || typeof data !== 'object') {
this.logger.debug(
{
tnx: 'OAUTH2',
user: this.options.user,
action: 'post'
},
'Response: %s',
(body || '').toString()
);
return callback(new Error('Invalid authentication response'));
}
let logData = {};
Object.keys(data).forEach(key => {
if (key !== 'access_token') {
logData[key] = data[key];
} else {
logData[key] = (data[key] || '').toString().substr(0, 6) + '...';
}
});
this.logger.debug(
{
tnx: 'OAUTH2',
user: this.options.user,
action: 'post'
},
'Response: %s',
JSON.stringify(logData)
);
if (data.error) {
// Error Response : https://tools.ietf.org/html/rfc6749#section-5.2
let errorMessage = data.error;
if (data.error_description) {
errorMessage += ': ' + data.error_description;
}
if (data.error_uri) {
errorMessage += ' (' + data.error_uri + ')';
}
return callback(new Error(errorMessage));
}
if (data.access_token) {
this.updateToken(data.access_token, data.expires_in);
return callback(null, this.accessToken);
}
return callback(new Error('No access token'));
});
}
/**
* Converts an access_token and user id into a base64 encoded XOAuth2 token
*
* @param {String} [accessToken] Access token string
* @return {String} Base64 encoded token for IMAP or SMTP login
*/
buildXOAuth2Token(accessToken) {
let authData = ['user=' + (this.options.user || ''), 'auth=Bearer ' + (accessToken || this.accessToken), '', ''];
return Buffer.from(authData.join('\x01'), 'utf-8').toString('base64');
}
/**
* Custom POST request handler.
* This is only needed to keep paths short in Windows usually this module
* is a dependency of a dependency and if it tries to require something
* like the request module the paths get way too long to handle for Windows.
* As we do only a simple POST request we do not actually require complicated
* logic support (no redirects, no nothing) anyway.
*
* @param {String} url Url to POST to
* @param {String|Buffer} payload Payload to POST
* @param {Function} callback Callback function with (err, buff)
*/
postRequest(url, payload, params, callback) {
let returned = false;
let chunks = [];
let chunklen = 0;
let req = nmfetch(url, {
method: 'post',
headers: params.customHeaders,
body: payload,
allowErrorResponse: true
});
req.on('readable', () => {
let chunk;
while ((chunk = req.read()) !== null) {
chunks.push(chunk);
chunklen += chunk.length;
}
});
req.once('error', err => {
if (returned) {
return;
}
returned = true;
return callback(err);
});
req.once('end', () => {
if (returned) {
return;
}
returned = true;
return callback(null, Buffer.concat(chunks, chunklen));
});
}
/**
* Encodes a buffer or a string into Base64url format
*
* @param {Buffer|String} data The data to convert
* @return {String} The encoded string
*/
toBase64URL(data) {
if (typeof data === 'string') {
data = Buffer.from(data);
}
return data
.toString('base64')
.replace(/[=]+/g, '') // remove '='s
.replace(/\+/g, '-') // '+' → '-'
.replace(/\//g, '_'); // '/' → '_'
}
/**
* Creates a JSON Web Token signed with RS256 (SHA256 + RSA)
*
* @param {Object} payload The payload to include in the generated token
* @return {String} The generated and signed token
*/
jwtSignRS256(payload) {
payload = ['{"alg":"RS256","typ":"JWT"}', JSON.stringify(payload)].map(val => this.toBase64URL(val)).join('.');
let signature = crypto.createSign('RSA-SHA256').update(payload).sign(this.options.privateKey);
return payload + '.' + this.toBase64URL(signature);
}
}
module.exports = XOAuth2;