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Added getLongLivedToken option #23

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Added getLongLivedToken option #23

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100 changes: 88 additions & 12 deletions lib/passport-facebook-token/strategy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ var util = require('util')
* Options:
* - `clientID` your Facebook application's App ID
* - `clientSecret` your Facebook application's App Secret
* - `getLongLivedToken` default false, if set to true, will try to obtain a
* long lived token from Facebook which will be accessible
* via req.longLivedToken
*
* Examples:
*
Expand All @@ -44,16 +47,19 @@ function FacebookTokenStrategy(options, verify) {
options = options || {}
options.authorizationURL = options.authorizationURL || 'https://www.facebook.com/dialog/oauth';
options.tokenURL = options.tokenURL || 'https://graph.facebook.com/oauth/access_token';
this.tokenURL = options.tokenURL;
options.scopeSeparator = options.scopeSeparator || ',';

this._passReqToCallback = options.passReqToCallback;

OAuth2Strategy.call(this, options, verify);
this._profileURL = options.profileURL || 'https://graph.facebook.com/me';
this.name = 'facebook-token';
this._clientID = options.clientID;
this._clientSecret = options.clientSecret;
this._enableProof = options.enableProof;
this._profileFields = options.profileFields || null;
this._getLongLivedToken = options.getLongLivedToken || false;
}

/**
Expand Down Expand Up @@ -94,18 +100,39 @@ FacebookTokenStrategy.prototype.authenticate = function(req, options) {

self._loadUserProfile(accessToken, function(err, profile) {
if (err) { return self.fail(err); };

function verified(err, user, info) {
if (err) { return self.error(err); }
if (!user) { return self.fail(info); }
self.success(user, info);
}

if (self._passReqToCallback) {
self._verify(req, accessToken, refreshToken, profile, verified);
} else {
self._verify(accessToken, refreshToken, profile, verified);
}

function passCallback(req,accessToken,refreshToken,profile) {
function verified(err, user, info) {
if (err) {
return self.error(err);
}
if (!user) {
return self.fail(info);
}
self.success(user, info);
}

if (self._passReqToCallback) {
self._verify(req, accessToken, refreshToken, profile, verified);
} else {
self._verify(accessToken, refreshToken, profile, verified);
}
}
if(self._getLongLivedToken) {
self._getLLT(accessToken, function (err, longLivedToken, expires) {
if(err){
self.error(err);
return;
}
req.longLivedToken = longLivedToken;
if(expires !== null){
req.longLivedTokenExpires = expires;
}
passCallback(req, accessToken, refreshToken, profile);
});
} else {
passCallback(req, accessToken, refreshToken, profile);
}
});
}

Expand Down Expand Up @@ -266,6 +293,55 @@ FacebookTokenStrategy.prototype._convertProfileFields = function(profileFields)
return fields.join(',');
};

/**
* Attempts to get a Long-Lived Token from Facebook.
* Requires a valid clientID (AppID), clientSecret (AppSecret) and accessToken
*
* @param {String} accessToken
* @param {Function} done
* @api private
*/
FacebookTokenStrategy.prototype._getLLT = function(accessToken,done){
var url = this.tokenURL + "?" +
"grant_type=fb_exchange_token" + "&" +
"client_id=" + this._clientID + "&" +
"client_secret=" + this._clientSecret + "&" +
"fb_exchange_token=" + accessToken;
url = uri.parse(url);
if (this._enableProof) {
// Secure API call by adding proof of the app secret. This is required when
// the "Require AppSecret Proof for Server API calls" setting has been
// enabled. The proof is a SHA256 hash of the access token, using the app
// secret as the key.
//
// For further details, refer to:
// https://developers.facebook.com/docs/reference/api/securing-graph-api/
var proof = crypto.createHmac('sha256', this._clientSecret).update(accessToken).digest('hex');
url.search = (url.search ? url.search + '&' : '') + 'appsecret_proof=' + encodeURIComponent(proof);
}
url = uri.format(url);
this._oauth2.getProtectedResource(url, accessToken, function (err, body, res) {
if (err) {
return done(new InternalOAuthError('failed to get long-lived token', err)); }
try {
var var_chunks = body.split("&");
var final_vars = {};
for(var i=0;i<var_chunks.length;i++){
var var_parts = var_chunks[i].split("=");
final_vars[var_parts[0]]=var_parts[1];
}
if(typeof final_vars.access_token === "undefined"){
return done('facebook was unable to provide a long-lived token');
}
if(typeof final_vars.expires === "undefined"){
final_vars.expires = null;
}
return done(null,final_vars.access_token,final_vars.expires)
} catch(e) {
done(e);
}
});
}

/**
* Expose `FacebookTokenStrategy`.
Expand Down