Facebook SDK integration

[KarlvonKarton]

Hello,

I'm trying to implement the Facebook SDK in my Processwire website, but that is not going quite well...

I have an _init.php wherein I've put:

// FACEBOOK
require_once $config->paths->root.'facebook-sdk-v5/autoload.php';

$fb = new Facebook\Facebook([
  'app_id' => 'the_id',
  'app_secret' => 'the_secret',
  'default_graph_version' => 'v2.5'
]);

But that gives me the error (not finding the class):
Fatal error: Class 'ProcessWire\Facebook\Facebook' not found in /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/site/templates/_init.php on line 38

What am I doing wrong?
Is the root of the website a good place to put the SDK folder?
Should I check all the paths in the Facebook SDK scripts?
Will "__DIR__" in the SDK scripts ever work within Processwire?

Edited August 2, 2016 by KarlvonKarton
id and secret

[LostKobrakai]

You're using the ProcessWire namespace in that file, therefore you need to declare files explicitly as not part of your current namespace:

<?php
namespace ProcessWire;
// …
$fb = new \Facebook\Facebook([
  'app_id' => 'the_id',
  'app_secret' => 'the_secret',
  'default_graph_version' => 'v2.5'
]);

As you seem to use pw 3.0 you could also use composer instead of manually including the package.

[KarlvonKarton]

The backslash did the trick. Thank you, LostKobrakai.

[KarlvonKarton]

But, not there yet...

Fatal error: Exception: Cross-site request forgery validation failed. The "state" param from the URL and session do not match. (in /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/facebook-sdk-v5/Helpers/FacebookRedirectLoginHelper.php line 285) #0 /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/facebook-sdk-v5/Helpers/FacebookRedirectLoginHelper.php(249): Facebook\Helpers\FacebookRedirectLoginHelper->validateCsrf() #1 /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/site/templates/home.php(43): Facebook\Helpers\FacebookRedirectLoginHelper->getAccessToken() #2 /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/wire/core/TemplateFile.php(219): require('/Users/iovalduc...') #3 [internal function]: ProcessWire\TemplateFile->___render() #4 /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/wire/core/Wire.php(347): call_user_func_array(Array, Array) #5 /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/wire/core/WireHooks.php(548) in /Users/iovalduc/Projectweb Media/Projecten/tits-and-party/Web/www/index.php on line 64

[KarlvonKarton]

The callback is sending a ?code=***  which gives the error (in the post above).

$helper = $fb->getRedirectLoginHelper();
$permissions = ['email', 'user_likes']; // optional
$loginUrl = $helper->getLoginUrl('http://{your-website}/login-callback.php', $permissions);

echo '<a href="' . $loginUrl . '">Log in with Facebook!</a>';

Any suggestions?

[KarlvonKarton]

SOLVED:

I've put the getLoginUrl after the getAccessToken section and now the log in works.

 

<?php namespace ProcessWire;

// This file is the _init.php

$homepage = $pages->get('/'); 

// FACEBOOK
require_once $config->paths->root.'facebook-sdk-v5/autoload.php';

$fb = new \Facebook\Facebook([ // Thank you LostKobrakai 4 the \
  'app_id' => 'my_app_id',
  'app_secret' => 'my_app_secret',
  'default_graph_version' => 'v2.5'
]);

$helper = $fb->getRedirectLoginHelper();

try {
  $fbAccessToken = $helper->getAccessToken();
} catch(\Facebook\Exceptions\FacebookResponseException $e) { // Thank you LostKobrakai 4 the \
  // When Graph returns an error
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(\Facebook\Exceptions\FacebookSDKException $e) { // Thank you LostKobrakai 4 the \
  // When validation fails or other local issues
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

$loginUrl = $helper->getLoginUrl($homepage->httpUrl);

// Include shared functions
include_once("./_func.php"); 

Source: http://stackoverflow.com/questions/31347341/the-state-param-from-the-url-and-session-do-not-match