/
index.js
executable file
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/
index.js
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// Dependencies
var https = require('https')
, querystring = require('querystring')
, url = require('url');
// Defaults
var FACEBOOK_GRAPH_URL = 'graph.facebook.com'
, FACEBOOK_OAUTH_PATH = '/oauth/access_token'
, config = {};
// Configuration
function init(options) {
config = {
appId: options.appId,
appSecret: options.appSecret,
verifyToken: options.verifyToken,
callbackUrl: options.callbackUrl
};
}
// OAuth
function authenticate(callback) {
https.get({
host: FACEBOOK_GRAPH_URL,
path: FACEBOOK_OAUTH_PATH +
'?client_id=' + config.appId +
'&client_secret=' + config.appSecret +
'&grant_type=client_credentials'
}, function(res) {
var data = "";
res.on('data', function(chunk) {
data += chunk;
}).on('end', function() {
if (data.toString().indexOf("error") === -1) {
var accessToken = data.split("=")[1];
config.accessToken = accessToken;
callback(null);
} else {
callback(data);
}
}).on('error', function(e) {
callback(e.message);
});
});
}
// Subscribe specified object and fields
function subscribe(object, fields, callback, scope) {
var req = https.request({
host: FACEBOOK_GRAPH_URL,
port: 443,
path: '/' + (typeof scope !== 'undefined' ? scope : config.appId) + '/subscriptions?access_token=' + config.accessToken,
method: 'POST'
}, function(res) {
var data = "";
res.on('data', function(chunk) {
data += chunk;
}).on('end', function() {
if (data.indexOf("error") === -1){
callback(null);
} else {
callback(data);
}
}).on('error', function(e) {
callback(e.message);
});
});
req.write(querystring.stringify({
'callback_url': config.callbackUrl,
'object': object,
'fields': fields,
'verify_token': config.verifyToken
}));
req.end();
}
// Unsubscribe specified object and fields
function unSubscribe(callback, scope) {
var req = https.request({
host: FACEBOOK_GRAPH_URL,
port: 443,
path: '/' + (typeof scope !== 'undefined' ? scope : config.appId) + '/subscriptions?access_token=' + config.accessToken,
method: 'DELETE'
}, function(res) {
var data = "";
res.on('data', function(chunk) {
data += chunk;
}).on('end', function() {
callback(JSON.parse(data));
}).on('error', function(e) {
callback(e.message);
});
});
req.end();
}
// Verify handler for Facebook
function verify(req, res) {
console.log('Get verification request...')
var url_parts = url.parse(req.url,true);
var query = url_parts.query;
if (query.hasOwnProperty('hub.verify_token')) {
if (query['hub.verify_token'] !== config.verifyToken) {
console.log('Invalid token.');
return res.send(404);
}
console.log('Verified');
return res.send(query['hub.challenge']);
}
return res.send(query['hub.challenge']);
}
// Retrieve the access token.
function getAccessToken() {
return config.accessToken;
}
// Retrieve current subscriptions
function getSubscriptions(callback, scope) {
https.get({
host: FACEBOOK_GRAPH_URL,
path: '/' + (typeof scope !== 'undefined' ? scope : config.appId) + '?access_token=' + getAccessToken()
}, function(res) {
var data = "";
res.on('data', function(chunk) {
data += chunk;
}).on('end', function() {
callback(JSON.parse(data));
}).on('error', function(e) {
callback(e.message);
});
});
}
// Retrieve feed from specified page
function getPageFeed(callback, page, query) {
queryString = query !== null ? '&' + querystring.stringify(query) : '';
https.get({
host: FACEBOOK_GRAPH_URL,
path: '/' + page + '/feed?access_token=' + getAccessToken() + queryString
}, function(res) {
var data = "";
res.on('data', function(chunk) {
data += chunk;
}).on('end', function() {
callback(JSON.parse(data));
}).on('error', function(e) {
callback(e.message);
});
});
}
module.exports = {
init: init,
authenticate: authenticate,
subscribe: subscribe,
unSubscribe: unSubscribe,
verify: verify,
getAccessToken: getAccessToken,
getSubscriptions: getSubscriptions,
getPageFeed: getPageFeed
};