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9.4

Is there something wrong with this Paypal IPN Class

Asked by TycoonMillion in PHP Scripting Language, Payment Processing Recommendation and Integrating, Miscellaneous Web Development

Tags: paypal, IPN

Hiya

I've spent hours with help on this site trying to get my IPN script working. But what I realise is that I've not asked the question, is there something wrong with this IPN Class?

I personally cannot see it but thats impossible because it returns an INVALID response everytime with Paypals Sandbox IPN Tool.

Can someone with a keen eye of experiance on IPN compare this script. I've compared it to Paypals own generated script and I can't see a difference where it matters that would cause the issue.

I've even tried paying someone on Guru.Com to do this but no takers!

So is there something wrong with mainly function CheckPayment($_POST) just half way down? 
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<?php 
class Paypal 
{		
	/* Print Form as Link */
	function getLink()
	{
		$url = $this->getPaypal();
		$link = 'https://'.$url.'/cgi-bin/webscr?';
		foreach($this->VARS as $item => $sub){
			$link .= $sub[0].'='.$sub[1].'&';
		}
		return $link;
	}
	
	/* Print Form */
	function showForm()
	{
		$url = $this->getPaypal();
		$FORM  = '<form action="https://'.$url.'/cgi-bin/webscr" method="post" target="_blank" style="display:inline;">'."\n";
		
		foreach($this->VARS as $item => $sub){
			$FORM .= '<input type="hidden" name="'.$sub[0].'" value="'.$sub[1].'">'."\n";
		}
				
		$FORM .= $this->button;    
		$FORM .= '</form>';
		echo $FORM;
	}
	
	/* Add variable to form */
	function addVar($varName,$value)
	{
		$this->VARS[${varName}][0] = $varName;
		$this->VARS[${varName}][1] = $value;
	}
	
	/* Add button Image */
	function addButton($type,$image = NULL)
	{
		switch($type)
		{
			/* Buy now */
			case 1:
				$this->button = '<input type="image" height="21" style="width:86;border:0px;"';
				$this->button .= 'src="https://www.paypal.com/en_US/i/btn/btn_paynow_SM.gif" border="0" name="submit" ';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
				break;
			/* Add to cart */	
			case 2:
				$this->button = '<input type="image" height="26" style="width:120;border:0px;"';
				$this->button .= 'src="https://www.paypal.com/en_US/i/btn/btn_cart_LG.gif" border="0" name="submit"';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
				break;
			/* Donate */	
			case 3:
				$this->button = '<input type="image" height="47" style="width:122;border:0px;"';
				$this->button .= 'src="https://www.paypal.com/en_US/i/btn/btn_donateCC_LG.gif" border="0" name="submit"';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
				break;
			/* Gift Certificate */
			case 4:	
				$this->button = '<input type="image" height="47" style="width:179;border:0px;"';
				$this->button .= 'src="https://www.paypal.com/en_US/i/btn/btn_giftCC_LG.gif" border="0" name="submit"';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
				break;
			/* Subscribe */
			case 5:	
				$this->button = '<input type="image" height="47" style="width:122;border:0px;"';
				$this->button .= 'src="https://www.paypal.com/en_US/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit"';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
				break;
			/* Custom Button */
			default:
				$this->button = '<input type="image" src="'.$image.'" border="0" name="submit"';
				$this->button .= 'alt="PayPal - The safer, easier way to pay online!">';
		}
		$this->button .= "\n";
	}
	
	/* Set log file for invalid requests */
	function setLogFile($logFile)
	{
		$this->logFile = $logFile;
	}
	
	/* Helper function to actually write to logfile */
	function doLog($_POST)
	{
		ob_start();
		echo '<pre>'; print_r($_POST); echo '</pre>';
		$logInfo = ob_get_contents();
		ob_end_clean();
		
		$file = fopen($this->logFile,'a');
		fwrite($file,$logInfo);
		fclose($file);
	}
	
	/* Check payment */
	function checkPayment($_POST)
	{
		/* read the post from PayPal system and add 'cmd' */
		$req = 'cmd=_notify-validate';
		
		/* Get post values and store them in req */
		foreach ($_POST as $key => $value) 
		{
			$value = urlencode(stripslashes($value));
			$req .= "&$key=$value";
		}
		
		$url = $this->getPaypal();
		
		/* post back to PayPal system to validate */
		$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
		$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
		$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
		$fp = fsockopen ('ssl://'.$url, 443, $errno, $errstr, 30);
 
		if (!$fp) 
		{   	 	
			mail('admin@webtechglobal.co.uk', "FP False", "FP has been returned as false",'admin@webtechglobal.co.uk');
			return false; 
		} 
		else 
		{
		 	mail('admin@webtechglobal.co.uk', "FP True", "FP has been returned as true",'admin@webtechglobal.co.uk');
			fputs ($fp, $header . $req);
			while (!feof($fp)) 
			{
				$res = fgets ($fp, 1024);
				if (strcmp ($res, "VERIFIED") == 0) 
				{			
					mail('admin@webtechglobal.co.uk', "VERIFIED", "VERIFIED RESPONSE",'admin@webtechglobal.co.uk');
					return true; //checkpayment.php receives true
				} 
				else //	if (strcmp ($res, "INVALID") == 0)
				{
				 	mail('admin@webtechglobal.co.uk', "INVALID", "INVALID Response",'admin@webtechglobal.co.uk');
					/*	log for manual investigation	*/
					if($this->logFile != NULL)
					{
						$this->doLog($_POST);
					}
					return false;
				}
			}
			fclose ($fp);
		}
		return false;
	}
	
	/* Set Test */
	function useSandBox($value)
	{
		$this->isTest=$value;
	}
	
	/* Private function to get paypal url */
	function getPaypal()
	{
		if($this->isTest == true)
		{
			return 'www.sandbox.paypal.com';
		} 
		else 
		{
			return 'www.paypal.com';
		}
	}
}
?>
[+][-]01/24/09 03:26 PM, ID: 23458695Accepted Solution

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About this solution

Zones: PHP Scripting Language, Payment Processing Recommendation and Integrating, Miscellaneous Web Development
Tags: paypal, IPN
Sign Up Now!
Solution Provided By: Ray_Paseur
Participating Experts: 2
Solution Grade: A
 
[+][-]01/23/09 12:09 PM, ID: 23452508Assisted Solution

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