OpenID for node.js is (yes, you guessed it) an OpenID implementation for node.js.
Highlights and features include:
- Full OpenID 1.1/OpenID 2.0 compliant Relying Party (client) implementation
- Very simple API
- Simple extension points for association state
The library can be reviewed and retrieved from GitHub.
If you use npm, simply do npm install openid.
If you don't use npm, you should. Alternatively, you can download the library, and move the
lib folder and openid.js to where you want them, and then require('openid').
(Remember to do require.paths.unshift on the directory you put the file in unless it's
already in your require.paths.)
Instead of walking through step-by-step, here's a very simple server using OpenID for node.js for authentication:
var openid = require('openid');
var url = require('url');
var querystring = require('querystring');
var relyingParty = new openid.RelyingParty(
'http://example.com/verify', // Verification URL (yours)
null, // Realm (optional, specifies realm for OpenID authentication)
false, // Use stateless verification
false, // Strict mode
[]); // List of extensions to enable and include
var server = require('http').createServer(
function(req, res)
{
var parsedUrl = url.parse(req.url);
if(parsedUrl.pathname == '/authenticate')
{
// User supplied identifier
var query = querystring.parse(parsedUrl.query);
var identifier = query.openid_identifier;
// Resolve identifier, associate, and build authentication URL
relyingParty.authenticate(identifier, false, function(error, authUrl)
{
if (error)
{
res.writeHead(200);
res.end('Authentication failed: ' + error);
}
else if (!authUrl)
{
res.writeHead(200);
res.end('Authentication failed');
}
else
{
res.writeHead(302, { Location: authUrl });
res.end();
}
});
}
else if(parsedUrl.pathname == '/verify')
{
// Verify identity assertion
// NOTE: Passing just the URL is also possible
relyingParty.verifyAssertion(req, function(error, result)
{
res.writeHead(200);
res.end(!error && result.authenticated
? 'Success :)'
: 'Failure :(');
});
}
else
{
// Deliver an OpenID form on all other URLs
res.writeHead(200);
res.end('<!DOCTYPE html><html><body>'
+ '<form method="get" action="/authenticate">'
+ '<p>Login using OpenID</p>'
+ '<input name="openid_identifier" />'
+ '<input type="submit" value="Login" />'
+ '</form></body></html>');
}
});
server.listen(80);
A more elaborate example including utilizing extensions can be found in sample.js in the GitHub repository.
To provide a way to save/load association state, you need to mix-in two functions in
the openid module:
saveAssociation(type, handle, secret, expiry_time)is called when a new association is established during authenticationloadAssociation(handle)is used to retrieve the association identified byhandlewhen verification happens
The openid module includes default implementations for these functions using a simple object to store the associations in-memory.
The verification of a positive assertion (i.e. an authenticated user) can be sped up significantly by avoiding the need for additional provider discoveries when possible. In order to achieve, this speed-up, node-openid needs to cache its discovered providers. You can mix-in two functions to override the default cache, which is an in-memory cache utilizing a simple object store:
-
saveDiscoveredInformation(provider, callback)is used when saving a discovered provider. Theprovider.claimedIdentifierattribute is the key for this object, and will be used for lookup later, when attempting to reuse this discovered information throughloadDiscoveredInformation. The following behavior is required:- When saving fails for some reason,
callback(error)is called witherrorbeing an error string specifying what failed. - When saving succeeds,
callback(null)is called.
- When saving fails for some reason,
-
loadDiscoveredInformation(claimedIdentifier, callback)is used to load any previously discovered information about the provider for a claimed identifier. The following behavior is required:- When no provider is found for the claimed identifier,
callback(null, null)is called (i.e. it is not an error to not have any data to return). - When loading fails for some reason,
callback(error, null)is called witherrorbeing an error string specifying why loading failed. - When loading succeeds,
callback(null, provider)is called with the exact provider object that was previously stored usingsaveDiscoveredInformation.
- When no provider is found for the claimed identifier,
OpenID for node.js is licensed under the MIT license. See LICENSE for further details.
The libary includes bigint functionality released by Tom Wu under the BSD license,
and Base64 functions released by Nick Galbreath under the MIT license. Please see
lib/bigint.js and lib/base64.js for the details of the licenses for these functions.
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