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server.js
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server.js
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var url = require('url'),
http = require('http'),
https = require('https'),
fs = require('fs'),
qs = require('querystring'),
express = require('express'),
app = express();
// Load config defaults from JSON file.
// Environment variables override defaults.
function loadConfig() {
var config = require('./config.json');
Object.keys(config).forEach(function(key) {
var envValue = process.env[key.toUpperCase()];
if (!envValue) return;
config[key] = (typeof config[key] === 'object') ? JSON.parse(envValue) : envValue;
});
console.log('Configuration');
console.log(config);
return config;
}
var config = loadConfig();
function authenticate(code, useCase, cb) {
var oauth = config[useCase] || config.default;
if (!oauth) {
cb(new Error('Could not find oauth settings'), null);
return;
}
var data = qs.stringify({
client_id: oauth.client_id,
client_secret: oauth.client_secret,
code: code
});
var reqOptions = {
host: config.oauth_host,
port: config.oauth_port,
path: config.oauth_path,
method: config.oauth_method,
headers: {
'content-length': data.length
}
};
var body = "";
var req = https.request(reqOptions, function(res) {
res.setEncoding('utf8');
res.on('data', function(chunk) {
body += chunk;
});
res.on('end', function() {
cb(null, qs.parse(body).access_token);
});
});
req.write(data);
req.end();
req.on('error', function(e) {
cb(e.message);
});
}
// Convenience for allowing CORS on routes - GET only
app.all('*', function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
res.header('Access-Control-Allow-Headers', 'Content-Type');
next();
});
app.get('/authenticate/:code', function(req, res) {
console.log('authenticating code:', req.params.code);
console.log('use case: ', req.query.case);
authenticate(req.params.code, req.query.case, function(err, token) {
var result = err || !token ? {
"error": "bad_code"
} : {
"token": token
};
console.log(result);
res.json(result);
});
});
var port = process.env.PORT || config.port || 9999;
app.listen(port, null, function(err) {
console.log('Gatekeeper, at your service: http://localhost:' + port);
});