reddit-bot.php

<?php 

define( 'REDDIT_API_USER_HASH', 'reddit_api' );


class Reddit_Api_Bot{

	
	//@mixed Set after successful login, otherwise false
	public $user_hash;
	
	//@mixed Last callback result
	public $last_result;
	
	//@array Last recorded error
	public $last_error;
		

	//@string Change your client's User-Agent string to something unique and descriptive
	private static $user_agent;	
	
	//@string Save session ID that we can now pass to other parts of the reddit API
	private static $cookie_path;	
		
	//@array Reddit Api callback array
	private static $the_callbacks;
	
	
	/**
     * set up the basics
     */
	function __construct( $args, $force_login = false ){
	
		$this->user_hash = $this->user_session( $args, $force_login );
	
		$this->user_agent = 'Reddit API example bot #' . md5( __DIR__ ) . ' from ' . $_SERVER['HTTP_USER_AGENT'];
		
		$this->cookie_path = __DIR__ . '/cookie.txt';
		
		return $this;
		
	}
	
	/**
     * unique identifier for the session
     */
	private static function unique_user(){
		foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 
			'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key) {
        	if (array_key_exists($key, $_SERVER) === true) {
            	foreach (explode(',', $_SERVER[$key]) as $ip) {
                	if (filter_var($ip, FILTER_VALIDATE_IP) !== false) {
                    	return md5( REDDIT_API_USER_HASH.'_'.str_replace(".","_",$ip) );
	                }
    	        }
        	}
	    }
	}
	
	/**
     * remember user hash
     */
	public function user_session( $args, $force_login ){
		if(!$force_login && isset($_COOKIE[$this->unique_user()])){
			return stripslashes($_COOKIE[$this->unique_user()]);
		}
		if( $login = $this->do_action( 'login', $args ) ){
			setcookie(
				$this->unique_user(),
				addslashes( $login ),
				time()+31556952,
				'/'
			);
		}
		return $login;
	}	

	/**
     * connect to reddit api
	 * actions: login, submit, del, compose, comment, editusertext
	 * for args see: https://github.com/reddit/reddit/wiki/API
	 * 
     */
	public function do_action( $action, $args ){
	
		$url = "http://www.reddit.com/api/" . ($action == "captcha" ? "submit" : $action);
	
		$args["api_type"] = 'json';
						
		$ch = curl_init( );
		
		curl_setopt( $ch, CURLOPT_POST, 1 );
		
		curl_setopt( $ch, CURLOPT_URL, $url );
		
		curl_setopt( $ch, CURLOPT_POSTFIELDS, http_build_query($args) );
		
		curl_setopt( $ch, CURLOPT_USERAGENT, $this->user_agent );
		
		curl_setopt( $ch, CURLOPT_COOKIEJAR, $this->cookie_path );
		
		curl_setopt( $ch, CURLOPT_COOKIEFILE, $this->cookie_path );
		
		curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
		
		$result = json_decode( curl_exec( $ch ) );
		
		curl_close( $ch );
		
		return $this->do_callback( $action,  $result );
		
	}	
	
	/**
     * validate the result
     */
	private function do_callback( $action, $result ){
	
		$bot = $this;
		
		$the_callbacks = array(	
			//returns user hash, else false
			'login' => function() use ( $result, $bot ){			
				if( $error = $result->json->errors[0][1] ){
					$bot->last_error = $error;
				} elseif( $uh = $result->json->data->modhash ){
					$bot->user_hash = $uh;
					return $uh;
				} else {
					$bot->last_error = 'login failed';
				}
				return false;
			},	
			//returns html image and input, else false
			'captcha' => function() use ( $result ){
				if( $captcha = $result->jquery[10][3][0] ){
					return "<img src='http://reddit.com/captcha/{$captcha}.png'>
						<input type='hidden' name='captcha_id' value='{$captcha}' />
						<input placeholder='are you human? (sorry)' name='captcha_answer' />";
				} 
				return false;
			},
			//returns ...
			'submit' => function() use ( $result ){
				if( $error = $result->json->errors[0][1] ){
					return $error;
				} else {
					print_r($result);
				}
				return false;
			},
			'del' => function() use ( $result, $bot ){
			
			},	
			'compose' => function() use ( $result, $bot ){
			
			},
			'comment' => function() use ( $result, $bot ){
			
			},	
			'editusertext' => function() use ( $result, $bot ){
			
			}	
		);
		
		return $this->last_result = call_user_func($the_callbacks[ $action ]);
						
	}
	
	/**
     * get the captcha
     */
	public function get_captcha(){	
		return $this->do_action( 
			'captcha', 
			array(  
				"kind" => "self", 
				"text" => "captcha", 
				"sr" => "test", 
				"title" => "", 
				"uh" => urlencode($this->user_hash) 
			) 
		);		
	}
	
	/**
     * format the captcha response
     */
	public function captcha_reponse( ){
		if(!isset($_POST['captcha_id'])){return array();}
		return array( 'captcha' => $_POST['captcha_answer'], 'iden' => $_POST['captcha_id'] );
	}
	
	/**
     * submit self post
	 * @array args: title, text, sr
     */
	public function self_post( $args ){
		$args = array_merge( $args, array(
			"kind" => "self", 
			"uh" => $this->user_hash
		));
		return $this->do_action( 'submit', $args );
	}


}