paypal

<?php
 /**
     Esta es una clase que escribi mucho tiempo atras, con errores en cuanto a modelado y no es orientada a OOP pero funciona bien.

     Uso:

     en un action solo llamar a:
     $ppal =  new PayPal();
     $ppal->handler();
     este action es lo que llamamos el "callback" en paypal, cuya url deberea ser registrada en la pagina de paypal para que al pagar se nos notifique con este callback.


     en una vista crear un formulario de pago paypal con:
     PayPal::createInstantPaymentForm($formid,$custom,$itemname,$itemnumber,$qty
        ,$subtotal,$discount,$total);

     requiere configuracion en el array de parametros en config main.

     Christian Salazar <christiansalazarh@gmail.com>
 */
 class PayPal {

    // variables a leer tras una llamada exitosa a paypalinst->handler();
    //
    public $p_txn_type;
    public $p_payer_id;
    public $p_txn_id;
    public $p_payment_date;
    public $p_custom;
    public $p_data;
    public $p_payment_status;
    public $p_verified;
    public $p_mc_gross_1;  // en realidad presenta a mc_gross,
    public $p_mc_fee;

    public function clear(){
        $this->p_txn_type="";
        $this->p_payer_id="";
        $this->p_txn_id="";
        $this->p_payment_date="";
        $this->p_custom="";
        $this->p_data="";
        $this->p_payment_status="";
        $this->p_verified="";
        $this->p_mc_gross_1="";
        $this->p_mc_fee="";
    }

    public static function createInstantPaymentForm($formid,$custom,$itemname,$itemnumber,$qty
        ,$subtotal,$discount,$total,$onsubmit_jsfunction_name=null)
    {
        $return_url = Yii::app()->params['paypal_returnurl'];
        $cancel_url = Yii::app()->params['paypal_cancelurl'];
        $email = Yii::app()->params['paypal_business'];
        $url = Yii::app()->params['paypal_url'];
        $notifyurl = Yii::app()->params['paypal_ipnhandler'];

        if($onsubmit_jsfunction_name == null)
        {
            $onsubmit = "";
        }
        else
        {
            $onsubmit = "onsubmit = 'return {$onsubmit_jsfunction_name}()';";
        }


        echo "\n\n<!-- paypal form -->\n";
        echo "<form action='$url' method='post' id='$formid' class='paypalform' {$onsubmit}>\n";
        echo "  \t<input type='hidden' name='business' value='$email'>\n";
        echo "  \t<input type='hidden' name='notify_url' value='$notifyurl'>\n";
        echo "  \t<input type='hidden' name='return' value='$return_url'>\n";
        echo "  \t<input type='hidden' name='cancel_url' value='$cancel_url'>\n";
        echo "  \t<input type='hidden' name='currency_code' value='USD'>\n";
        echo "  \t<input type='hidden' name='address_override' value='1'>\n";
        echo "  \t<input type='hidden' name='no_shipping' value='1'>\n";
        //echo "    \t<input type='hidden' name='tax' value='0'>\n";
        echo "  \t<input type='hidden' name='cmd' value='_xclick'>\n";
        echo "  \t<input type='hidden' name='custom' value='$custom' />\n";
        echo "  \t<input type='hidden' name='item_name' value='$itemname'>\n";
        //echo "    \t<input type='hidden' name='item_number' value='$itemnumber'>\n";
        //echo "    \t<input type='hidden' name='quantity' value='$qty'>\n";
        echo "  \t<input type='hidden' name='amount' value='$total'>\n";
        echo "  \t<input type='submit' value='' class='paypalbutton'>\n";
        echo "</form>\n\n\n";
    }



    /** este handler debe ir en un action expuesto a paypal
     *
     *
     */
    public function handler()
    {
        Yii::log("inicia handler","info");

        // url para enviar de vuelta el paquete ipn enviado para ser verificado por paypal
        $verifier = Yii::app()->params['paypal_verifier'];
        error_reporting(E_ALL ^ E_NOTICE);

        $this->p_txn_type = $_POST['txn_type'];
        $this->p_payer_id = $_POST['payer_id'];
        $this->p_txn_id = $_POST['txn_id'];
        $this->p_payment_date = $_POST['payment_date'];
        $this->p_custom = $_POST['custom'];
        $this->p_payment_status = $_POST['payment_status'];
        $this->p_mc_gross_1 = $_POST['mc_gross'];
        $this->p_mc_fee = $_POST['mc_fee'];

        $this->p_data = "";
        foreach($_POST as $k=>$v)
            $this->p_data .= "{$k}={$v}\r\n";

        Yii::log("handler data:\r\n".$this->p_data,"info");

        // Read the post from PayPal and add 'cmd'
        $req = 'cmd=_notify-validate';
        if(function_exists('get_magic_quotes_gpc'))
            $get_magic_quotes_exits = true;

        foreach ($_POST as $key => $value)
        {
            if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1)
            {
                $value = urlencode(stripslashes($value));
            }
            else
            {
                $value = urlencode($value);
            }
            $req .= "&$key=$value";
        }

        // Post back to PayPal 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";

        Yii::log("handler verifier:\r\n".$verifier,"info");

        $fp = fsockopen ($verifier, 443, $errno, $errstr, 30);
        if (!$fp)
        { // HTTP ERROR
            $reception = "HTTP-ERROR";
        }
        else
        {
            // NO HTTP ERROR
            fputs ($fp, $header . $req);
            while (!feof($fp))
            {
                $res = fgets ($fp, 1024);

                if (strcmp ($res, "VERIFIED") == 0)
                {
                    $reception = "VERIFIED";
                }
                else
                if (strcmp ($res, "INVALID") == 0)
                {
                    $reception = "INVALID";
                }
            }
        }
        fclose ($fp);
        Yii::log("handler verifier result:\r\n".$reception,"info");

        $this->p_verified = $reception;
        return ($reception == "VERIFIED");
    }
 }