Facebook canvas authentication strategy for Passport.
Use this strategy to log users in to your Facebook Canvas app automatically.
Note: This strategy simply augments passport-facebook, if you don't need Facebook Canvas support you should use that module instead.
npm install passport-facebook-canvas --save
Facebook has deprecated
Canvas Url in favour of
Secure Canvas Url and so requires setting up an SSL cert. You can produce a
self-signed certificate with a command such as this: (don't set a password for a testing cert)
# Ubuntusudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout self_signed_ssl.key -out self_signed_ssl.crt
Then you must tell
express to listen on another port, something like this:
var certificate =key: fsreadFileSyncpathresolve__dirname './self_signed_ssl.key' 'utf8'cert: fsreadFileSyncpathresolve__dirname './self_signed_ssl.crt' 'utf8'httpcreateServerapplisten3000;httpscreateServercertificate applisten3001;
Configuration is exactly the same as with passport-facebook except the module name is
'passport-facebook-canvas' instead of
var FacebookStrategy = require'passport-facebook-canvas';passportuseclientID: FACEBOOK_APP_IDclientSecret: FACEBOOK_APP_SECRETcallbackURL: ""UserfindOrCreate facebookId: profileidreturn doneerr user;;;
Configuration is exactly the same as with passport-facebook except the strategy name is
'facebook-canvas' instead of
appget'/auth/facebook' passportauthenticate'facebook-canvas';appget'/auth/facebook/callback'passportauthenticate'facebook-canvas' successRedirect: '/'failureRedirect: '/error' ;
This is the
Secure Canvas Url route that Facebook will POST data to.
Note If this is the first time the app has seen this user then redirect to
apppost'/auth/facebook/canvas'passportauthenticate'facebook-canvas' successRedirect: '/'failureRedirect: '/auth/facebook/canvas/autologin' ;
We cannot forward the user to another URL via HTTP redirect so we have to use a client-side js hack instead.
Please suggest a better solution: https://developers.facebook.com/docs/appsonfacebook/tutorial/#canvas
Now you should be able to navigate to your app page: https://apps.facebook.com/myapp/ and be prompted to approve the app. On subsequent visits you should be logged in automatically.
(The MIT License)
Copyright (c) 2013 Peter Johnson <@insertcoffee>
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