Add Facebook authentication support

jingo

@@ -21,6 +21,7 @@ var express        = require('express')
   , Url            = require('url')
   , GoogleStrategy = require('passport-google').Strategy
   , LocalStrategy  = require('passport-local').Strategy
+  , FacebookStrategy = require('passport-facebook').Strategy
   , yaml           = require('yaml-js')
   , Flash          = require('connect-flash')
   , program        = require('commander');
@@ -97,11 +98,11 @@ if (!config.application || !config.server) {
   process.exit(-1);
 }
 
-app.locals.authorization = config.authorization || { anonRead: false, validMatches: ".+" };
 var auth = app.locals.authentication = config.authentication || { google: { enabled: true }, alone: { enabled: false } };
 
 if ( (!auth.google || !auth.google.enabled) && 
-     (!auth.alone  || !auth.alone.enabled) ) {
+     (!auth.alone  || !auth.alone.enabled) &&
+     (!auth.facebook || !auth.facebook.appId || !auth.facebook.appSecret) ) {
   console.log("Error: no authentication method provided. Cannot continue.");
   process.exit(-1);
 }
@@ -247,6 +248,20 @@ passport.use(new GoogleStrategy({
   }
 ));
 
+if (auth.facebook) {
+  passport.use(new FacebookStrategy({
+      clientID: auth.facebook.appId,
+      clientSecret: auth.facebook.appSecret,
+      callbackURL: app.locals.baseUrl + '/auth/facebook/return',
+      profileFields: ['displayName', 'emails', 'id']
+    },
+    function(accessToken, refreshToken, profile, done) {
+      usedAuthentication("facebook");
+      done(undefined, profile);
+    }
+  ));
+}
+
 passport.use(new LocalStrategy(
 
   function(username, password, done) {
@@ -321,6 +336,10 @@ app.get    ("/auth/google",           passport.authenticate('google'));
 app.get    ("/auth/google/return",    passport.authenticate('google', { successRedirect: '/auth/done', failureRedirect: '/login' }));
 app.get    ("/auth/done",             routes.authDone);
 
+app.get    ("/auth/facebook",         passport.authenticate('facebook', { scope: ['email'] }));
+app.get    ("/auth/facebook/return",  passport.authenticate('facebook', { successRedirect: '/auth/done', failureRedirect: '/login' }));
+app.get    ("/auth/done",             routes.authDone);
+
 app.all('*', routes.error404);
 
 var listenAddr = process.env.NW_ADDR || "";

lib/tools.js

@@ -26,15 +26,25 @@ var tools = {
       return false;
     }
 
-    if (!pattern || pattern.trim() == "") {
+    if (!pattern) {
       return true;
     }
 
     if (!email.match(/\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/i)) {
       return false;
     }
 
-    var tests = pattern.split(",").map(function(str) { return str.trim(); });
+    var tests;
+    if (pattern instanceof Array) {
+      tests = pattern;
+    } else if (typeof pattern == "string") {
+      tests = pattern.split(",").map(function(str) { return str.trim(); });
+    }
+
+    if (tests.length === 0) {
+      return true;
+    }
+
     var expr;
     for (var i=0; i < tests.length; i++) {
       try {
@@ -45,7 +55,6 @@ var tools = {
     }
 
     return expr;
-
   },
 
   hashify: function(str) {

package.json

@@ -17,6 +17,7 @@
     "jade": "*",
     "passport": "*",
     "passport-google": "*",
+    "passport-facebook": "*",
     "passport-local": "*",
     "iconv": "*",
     "marked": ">= 0.2.x",

views/layout.jade

@@ -29,7 +29,9 @@ html
                 a(id='login',href='/login?destination', title='Access login page') logged in
             else
               p.user
-                if user.email
+                if user.provider == 'facebook'
+                  img(src="//graph.facebook.com/#{user.id}/picture?type=square", width=32)
+                else if user.email
                   img(src=gravatar().url("#{user.email}", {s:24}))
                 b  #{user.displayName} 
                 a(href='/logout', title='Become anonymous') [Logout]

views/login.jade

@@ -34,3 +34,9 @@ block content
         mixin saveAndCancel('Login')
 
       hr
+
+    if (auth.facebook)
+      p
+        b Login using
+        a.btn.btn-primary(href="/auth/facebook") Facebook login
+      hr