Twitter integration demo

_v_template.php

<!-- ADD THIS SOMEWHERE IN YOUR MASTER TEMPLATE (OR WHEREEVER YOU WANT IT TO APPEAR) -->

<? if (!$user->twitter->connected): ?>  	
	You are <strong>not</strong> connected to Twitter. <a href='/twitter/redirect'>Would you like to connect?</a>
<? else: ?>
	You are connected to Twitter. <a href='/twitter/clearsessions'>Disconnect</a>
<? endif; ?>

c_base.php

<?php

public function __construct() {
  # Instantiate User obj
		$this->userObj = new User();
		
	# Authenticate / load user
		$this->user = $this->userObj->authenticate();					
					
	# Set up templates
		$this->template 	  = View::instance('_v_template');
		$this->email_template = View::instance('_v_email');			
							
	# So we can use $user in views			
		$this->template->set_global('user', $this->user);
		
	# Is this user connected to Twitter?
		if($this->user) {
			# Ideally these constants should be in config.php but leaving here for demonstration purposes.	
			define('CONSUMER_KEY', 'DaCTGU1jK93WxrZ5RKg');
			define('CONSUMER_SECRET', 'H9DS2HoWBv8PEseeg2bpQj9Ho9A0lq3GJgqEPRvfZ8');
			
			# Create object in user object to store twitter related data
			$this->user->twitter = new stdClass;

			# First, find out if they're already conected
			if (empty($_SESSION['access_token']) || empty($_SESSION['access_token']['oauth_token']) || empty($_SESSION['access_token']['oauth_token_secret'])) {
				$this->user->twitter->connected = FALSE;
			}
			else {
				$this->user->twitter->connected  = TRUE;
				
				# Get user access tokens out of the session. 
				$access_token = $_SESSION['access_token'];

				# Create a TwitterOauth object with consumer/user tokens. 
				$this->user->twitter->connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $access_token['oauth_token'], $access_token['oauth_token_secret']);
			}
		}
				
	# Pass that array to the template.
	$this->template->navigation = $nav;	
		
}

c_post.php

# ADD THIS SOMEWHERE IN YOUR c_posts.php p_add() method

# [...code here about adding the post to the database...]

# Tweet it if they're connected
if($this->user->twitter->connected) { 
	$tweet = $this->user->twitter->connection->post('statuses/update', array('status' => $_POST['content']));
}

c_twitter.php

<?php
// BRAND NEW TWITTER CONTROLLER

class twitter_controller extends base_controller {

  public function __construct() {
		parent::__construct();	
	}
	
		
	/*-------------------------------------------------------------------------------------------------
	This is what talks to Twitter to create the connection
	-------------------------------------------------------------------------------------------------*/
	public function redirect() {
	
		# Build TwitterOAuth object with client credentials. 
		$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET);
		
		# Get temporary credentials
		$request_token = $connection->getRequestToken(APP_URL.'/twitter/callback');
		
		# Save temporary credentials to session. 
		$_SESSION['oauth_token'] = $token = $request_token['oauth_token'];
		$_SESSION['oauth_token_secret'] = $request_token['oauth_token_secret'];
		
		# If last connection failed don't display authorization link. 
		switch ($connection->http_code) {
		case 200:
			# Build authorize URL and redirect user to Twitter. 
			$url = $connection->getAuthorizeURL($token);
			header('Location: ' . $url); 
		break;
		default:
			echo 'Could not connect to Twitter. Refresh the page or try again later.';
		}

	}
	

	/*-------------------------------------------------------------------------------------------------
	This is the URL Twitter hits after we hit it from redirect()
	We specify above this in redirect()
	-------------------------------------------------------------------------------------------------*/
	public function callback() {
	
		# If the oauth_token is old redirect to the connect page
		if (isset($_REQUEST['oauth_token']) && $_SESSION['oauth_token'] !== $_REQUEST['oauth_token']) {
		  $_SESSION['oauth_status'] = 'oldtoken';
		  header('Location: /clearsessions/');
		}
		
		# Create TwitteroAuth object with app key/secret and token key/secret from default phase
		$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $_SESSION['oauth_token'], $_SESSION['oauth_token_secret']);
		
		# Request access tokens from twitter 
		$access_token = $connection->getAccessToken($_REQUEST['oauth_verifier']);
		
		# Save the access tokens. Normally these would be saved in a database for future use. 
		$_SESSION['access_token'] = $access_token;
		
		# Remove no longer needed request tokens 
		unset($_SESSION['oauth_token']);
		unset($_SESSION['oauth_token_secret']);
		
		# If HTTP response is 200 continue otherwise send to connect page to retry 
		if (200 == $connection->http_code) {
		  # The user has been verified and the access tokens can be saved for future use 
		  $_SESSION['status'] = 'verified';
		  header('Location: /');
		
		} else {
		  # Save HTTP status for error dialog on connnect page.
		  header('Location: /twitter/clearsessions/');
		}

	}


	/*-------------------------------------------------------------------------------------------------
	When we want to disconnect from Twitter
	-------------------------------------------------------------------------------------------------*/
	public function clearsessions() {
	
		/* Load and clear sessions */
		session_destroy();
		
		/* Redirect to page with the connect to Twitter option. */
		header('Location: /');
	
	}
	
} # eoc