A simple set of functions to handle PubSubHubbub handshakes & verification.
Many services including RSS aggregators like Google Reader, social networks like Facebook, and photo services like Flickr & Instagram implement some variation of the PubSubHubbub protocol (PuSH).
There are two generic bits of functionality that are required when subscribing for PuSH updates from these services. First, we need to complete a handshake with the server when subscribing.
The second bit is verifying the notification when the server pushes an update. Both of these are standard, service independent bits of code, so it didn't make sense to use code that's in a particular library. This library does nothing but those two functions and exposes simple methods that can be used in an express.js app or anywhere else.
Here's my subscription code from my app.
// a GET request will be a challenge query
app.get('/instagram/realtime', function(req, res){
PuSHHelper.handshake(req, res);
});
// this is where Instagram will send updates (using POST)
app.post('/instagram/realtime', PuSHHelper.verifier(config.instagram.client_secret), function(req, res){
console.log("Received a notification");
// process the notifications
});You can see a working example in the Proxigram source code.
The library draws functionality from the instagram-node-lib NPM located at https://github.com/mckelvey/instagram-node-lib and the nubnub project located here: https://github.com/technoweenie/nubnub
See the LICENSE file for information