<?

// Validate an email address. 
// Provide email address (raw input) Returns true if the email address has the email address format and the domain exists.
function validEmail($email) {

   $isValid = true;
   $atIndex = strrpos($email, "@");
   if (is_bool($atIndex) && !$atIndex) {
      $isValid = false;
   }
   else {
      $domain = substr($email, $atIndex+1);
      $local = substr($email, 0, $atIndex);
      $localLen = strlen($local);
      $domainLen = strlen($domain);
      if ($localLen < 1 || $localLen > 64) {
         // local part length exceeded
         $isValid = false;
      }
      else if ($domainLen < 1 || $domainLen > 255) {
         // domain part length exceeded
         $isValid = false;
      }
      else if ($local[0] == '.' || $local[$localLen-1] == '.') {
         // local part starts or ends with '.'
         $isValid = false;
      }
      else if (preg_match('/\\.\\./', $local)) {
         // local part has two consecutive dots
         $isValid = false;
      }
      else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain)) {
         // character not valid in domain part
         $isValid = false;
      }
      else if (preg_match('/\\.\\./', $domain)) {
         // domain part has two consecutive dots
         $isValid = false;
      }
      else if (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/', str_replace("\\\\","",$local))) { 
         // character not valid in local part unless 
         // local part is quoted
         if (!preg_match('/^"(\\\\"|[^"])+"$/', str_replace("\\\\","",$local))) {
            $isValid = false;
         }
      }
      if ($isValid && !(checkdnsrr($domain,"MX") ||  checkdnsrr($domain,"A"))) {
         // domain not found in DNS
         $isValid = false;
      }
   }
   return $isValid;
}

// password conditions
function validPassword($password)
{
	if(
		//ctype_alnum($password) &&// numbers & digits only
		strlen($password)>7 // at least 8 chars
		&& strlen($password)<21 // at most 20 chars
		//&& preg_match('`[A-Z]`',$password) // at least one upper case
		//&& preg_match('`[a-z]`',$password) // at least one lower case
		//&& preg_match('`[0-9]`',$password) // at least one digit
	){
		return true;
	}
	else return false;
}


// encrypt cookie data saved on client side
function encryptCookie($value)
{
   if(!$value){return false;}
   $key = 'MZEmB1tO391YL537';
   $text = $value;
   $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
   $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
   return trim(strtr(base64_encode($crypttext),'+/=', '-_,')); //encode for cookie
}

// decrypt data from above function
function decryptCookie($value)
{
   if(!$value){return false;}
   $key = 'MZEmB1tO391YL537';
   $crypttext = base64_decode(strtr($value, '-_,', '+/=')); //decode cookie
   $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
   $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypttext, MCRYPT_MODE_ECB, $iv);
   return trim($decrypttext);
}

function sanitizeInputs(&$item1, $key)
{
	if(is_string($item1)){
		$item1 = strip_tags(trim($item1));
	}
}

function cleanInputs(&$item1, $key)
{
	if(is_string($item1)){
		$item1 = stripslashes(nl2br($item1));
	}	

}

function url_exists($url) {
	/*$handle = @fopen($url, "r");
	 if ($handle === false)	return false;
	fclose($handle);
	return true;*/
	if (is_array(@get_headers($url)))
		return true;
	else
		return false;

}

function topiaExtractor($text) {

	$cmd = "cd ".ROOT_PATH."/library/topic; ./extract2.py \"".$text."\"";

	$exec_out = `$cmd`;
	$tags = json_decode($exec_out,true);
	return $tags;
}

function listDirImages($dir) { //$dir is the name of the directory you want to list the images.
	$files = scandir($dir); //scans the directory's files
	$preg = "/.(jpg)/i"; //match the following files, can be changed to limit or extend range, ie: png,jpeg,etc.

	$images = array();

	foreach($files as $img) { //loop through directory files
		if(substr($img, 0, 1) != '.') { //ignore anything starting with a period
			$images[]= $img;
		}
	}

	return $images;
}


?>