Google Identity Toolkit with go Step 3

How many users has Facebook currently? Round about 800 Million? Of course I want to welcome them on my site:

 func verifyFacebookAccount(ctx *web.Context) string {  
      api_url := "https://graph.facebook.com/oauth/access_token?client_id=xxx&redirect_uri=http://kwiqly.com/fbcallback&client_secret=1cf9ee8ac30ba20c25f298b262aa17bd&code=" + ctx.Request.Params["code"]  
      response, _ := http.Get(api_url)  
      b, _ := ioutil.ReadAll(response.Body)  
      accessToken := string(b)  
      response, _ = http.Get("https://graph.facebook.com/me?" + accessToken)  
      b, _ = ioutil.ReadAll(response.Body)  
      var f map[string]string  
      json.Unmarshal(b, &f)  
      registerFBUser(&f)  
      return f["email"]  
 }  

The JSON response I receive for my own acount looks like this:

 {  
   "id": "xxx",  
   "name": "Andreas Mu00fcller",  
   "first_name": "Andreas",  
   "last_name": "Mu00fcller",  
   "link": "http://www.facebook.com/asmuelle",  
   "username": "asmuelle",  
   "bio": "My CV coming soon",  
   "work": [  
     {  
       "employer": {  
         "id": "261972930486746",  
         "name": "energiepraemisse GmbH"  
       },  
       "location": {  
         "id": "106561559378306",  
         "name": "Niederried, Bern, Switzerland"  
       },  
       "position": {  
         "id": "148305368513781",  
         "name": "CTO"  
       },  
       "start_date": "2011-01"  
     }  
   ],  
   "education": [  
     {  
       "school": {  
         "id": "102066659835464",  
         "name": "Kaspar Zeuu00df Gymnasium"  
       },  
       "year": {  
         "id": "135676686463386",  
         "name": "1994"  
       },  
       "type": "High School",  
       "classes": [  
         {  
           "id": "193949477289719",  
           "name": "Biologie"  
         },  
         {  
           "id": "113028568708566",  
           "name": "Mathematik"  
         }  
       ]  
     },  
     {  
       "school": {  
         "id": "111896025493840",  
         "name": "Friedrich-Alexander-Universitu00e4t Erlangen-Nu00fcrnberg"  
       },  
       "year": {  
         "id": "144503378895008",  
         "name": "1999"  
       },  
       "concentration": [  
         {  
           "id": "103112013061919",  
           "name": "Mustererkennung"  
         },  
         {  
           "id": "105972309433865",  
           "name": "Computergrafik"  
         },  
         {  
           "id": "153631238025207",  
           "name": "Datenbanken"  
         }  
       ],  
       "type": "College"  
     }  
   ],  
   "gender": "male",  
   "email": "a.muelleru0040herban.de",  
   "timezone": 1,  
   "locale": "de_DE",  
   "verified": true,  
   "updated_time": "2011-09-16T08:14:46+0000"  
 }  

Unfortunately, Facebook is currently not supported by GIT, but on www.openidsamplestore.com I learned how you can define custom IDPs:

 window.google.identitytoolkit.addCustomIdp({
      'providerId': 'Facebook',
      'imageUrl': 'http://www.dwmroofing.com/images/facebook.jpg',
      'label': 'www.facebook.com',
      'createAuthUriHandler': function(callbackUrl, callbackHandler) {
        callbackHandler({ 'authUri': 'http://www.facebook.com/dialog/oauth?client_id=xxx&display=popup&scope=email&redirect_uri=http://kwiqly.com/fbcallback' });
      }});

Beyond this the response handler must be changed:

  

  var widget = window.google.identitytoolkit.easyrp.util.getWidget_();
  widget.handleGetUserStatusResponse_ = jQuery.proxy(function(result) {
    if (result && 'registered' in result) {
      var account = {email: result.email, legacy: true};
      if (result.displayName) {
        account.displayName = result.displayName;
      }
      if (result.photoUrl) {
        account.photoUrl = result.photoUrl;
      }
      if (result.registered) {
        window.google.identitytoolkit.easyrp.util.accountstorage.
            refreshAccount(account);
      }
      if (result.legacy && result.registered) {
        this.showLegacySignInPage(account);
      } else if (result.legacy) {
        this.showSignUpPage(result.email, true);
      } else {
        if (result.providerId) {
          this.startFederatedLogin_(result.providerId, 'signin', result.email);
        } else {
          this.startFederatedLogin_(result.email, 'signin', result.email);
        }
      }
    } else {
      this.page_.setError(window.google.identitytoolkit.easyrp.messages.
          signUpTypePage.emailFormatError);
    }
  }, widget);

The showAccountChooserPage must be hacked to add support to only show the specified accounts.

  // Hack the showAccountChooserPage to add support to only show the specified accounts.
  widget.showAccountChooserPage = jQuery.proxy(function(opt_error, opt_accounts) {
    jQuery('#popin-box').empty().addClass('widget-panel-chooser');
    var self = this;
    this.page_ =
        new window.google.identitytoolkit.easyrp.page.AccountChooserPage();
    this.page_.onAccountClicked = function(account) {
      if (account.email == self.options.email) {
        self.closeAccountChooser();
      } else if (window.google.identitytoolkit.easyrp.config.
          tryFederatedFirst) {
        self.tryFederatedLoginInAC_(account.email, 'signin', account.email);
      } else if (window.google.identitytoolkit.easyrp.config.
          useCachedUserStatus) {
        if (account.legacy) {
          self.showLegacySignInPage(account);
        } else {
          self.startFederatedLogin_(account.email, 'signin', account.email);
        }
      } else {
        var request = self.getRequestFactory().newGetUserStatusRequest(
            account.email, false);
        request.execute(jQuery.proxy(self.handleGetUserStatusResponse_, self));
      }
    };
    this.page_.onAddAccountClicked = function() {
      self.showAddAccountPage();
    };
    this.page_.onRemoveAccountClicked = function(account) {
      window.google.identitytoolkit.easyrp.util.accountstorage.removeAccount(account);
      self.showAccountChooserPage();
    };
    this.page_.onCloseIconClicked = function() {
      self.closeAccountChooser();
    };
    var accounts = opt_accounts || window.google.identitytoolkit.easyrp.util.accountstorage.
        readAccounts();
    this.page_.render(jQuery('#popin-box'), accounts, undefined, true);
    if (opt_error) {
      this.page_.setError(opt_error);
    }
    window.google.identitytoolkit.easyrp.util.setPopinPosition_();
  }, widget);