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sampleclient.js
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sampleclient.js
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// Copyright 2016, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';
/**
* This is used by several samples to easily provide an oauth2 workflow.
*/
const {google} = require('googleapis');
const http = require('http');
const url = require('url');
const querystring = require('querystring');
const opn = require('opn');
const destroyer = require('server-destroy');
const fs = require('fs');
const path = require('path');
const keyPath = path.join(__dirname, 'oauth2.keys.json');
let keys = { redirect_uris: [''] };
if (fs.existsSync(keyPath)) {
const keyFile = require(keyPath);
keys = keyFile.installed || keyFile.web;
}
const invalidRedirectUri = `The provided keyfile does not define a valid
redirect URI. There must be at least one redirect URI defined, and this sample
assumes it redirects to 'http://localhost:3000/oauth2callback'. Please edit
your keyfile, and add a 'redirect_uris' section. For example:
"redirect_uris": [
"http://localhost:3000/oauth2callback"
]
`;
class SampleClient {
constructor (options) {
this._options = options || { scopes: [] };
// validate the redirectUri. This is a frequent cause of confusion.
if (!keys.redirect_uris || keys.redirect_uris.length === 0) {
throw new Error(invalidRedirectUri);
}
const redirectUri = keys.redirect_uris[keys.redirect_uris.length - 1];
const parts = url.parse(redirectUri, false);
if (redirectUri.length === 0 || parts.port !== '3000' || parts.hostname !== 'localhost' || parts.path !== '/oauth2callback') {
throw new Error(invalidRedirectUri);
}
// create an oAuth client to authorize the API call
this.oAuth2Client = new google.auth.OAuth2(
keys.client_id,
keys.client_secret,
redirectUri
);
}
// Open an http server to accept the oauth callback. In this
// simple example, the only request to our webserver is to
// /oauth2callback?code=<code>
async authenticate (scopes) {
return new Promise((resolve, reject) => {
// grab the url that will be used for authorization
this.authorizeUrl = this.oAuth2Client.generateAuthUrl({
access_type: 'offline',
scope: scopes.join(' ')
});
const server = http.createServer(async (req, res) => {
try {
if (req.url.indexOf('/oauth2callback') > -1) {
const qs = querystring.parse(url.parse(req.url).query);
res.end('Authentication successful! Please return to the console.');
server.destroy();
const {tokens} = await this.oAuth2Client.getToken(qs.code);
this.oAuth2Client.credentials = tokens;
resolve(this.oAuth2Client);
}
} catch (e) {
reject(e);
}
}).listen(3000, () => {
// open the browser to the authorize url to start the workflow
opn(this.authorizeUrl, {wait: false}).then(cp => cp.unref());
});
destroyer(server);
});
}
}
module.exports = new SampleClient();