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Viewing File: /home/u456810272/domains/globalsoftech.org.in/public_html/unimatrix/common/paypal.ipv.php

<?php

if (!defined('OK_LOADME')) {
    die('n o p a g e !');
}

class PaypalIPN {

    /** @var bool Indicates if the sandbox endpoint is used. */
    private $use_sandbox = false;

    /** @var bool Indicates if the local certificates are used. */
    private $use_local_certs = true;

    /** Production Postback URL */
    const VERIFY_URI = 'https://ipnpb.paypal.com/cgi-bin/webscr';

    /** Sandbox Postback URL */
    const SANDBOX_VERIFY_URI = 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';

    /** Response from Paypal indicating validation was successful */
    const VALID = 'VERIFIED';

    /** Response from Paypal indicating validation failed */
    const INVALID = 'INVALID';

    /**
     * Sets the IPN verification to sandbox mode (for use when testing,
     * should not be enabled in production).
     * @return void
     */
    public function useSandbox() {
        $this->use_sandbox = true;
    }

    /**
     * Sets curl to use php curl's built in certs (may be required in some
     * environments).
     * @return void
     */
    public function usePHPCerts() {
        $this->use_local_certs = false;
    }

    /**
     * Determine endpoint to post the verification data to.
     *
     * @return string
     */
    public function getPaypalUri() {
        if ($this->use_sandbox) {
            return self::SANDBOX_VERIFY_URI;
        } else {
            return self::VERIFY_URI;
        }
    }

    /**
     * Verification Function
     * Sends the incoming post data back to Paypal using the cURL library.
     *
     * @return bool
     * @printlog error text
     */
    public function verifyIPN() {
        if (!count($_POST)) {
            printlog('paypal.ipn', "Missing POST Data");
        }

        $raw_post_data = file_get_contents('php://input');
        $raw_post_array = explode('&', $raw_post_data);
        $myPost = array();
        foreach ($raw_post_array as $keyval) {
            $keyval = explode('=', $keyval);
            if (count($keyval) == 2) {
                // Since we do not want the plus in the datetime string to be encoded to a space, we manually encode it.
                if ($keyval[0] === 'payment_date') {
                    if (substr_count($keyval[1], '+') === 1) {
                        $keyval[1] = str_replace('+', '%2B', $keyval[1]);
                    }
                }
                $myPost[$keyval[0]] = urldecode($keyval[1]);
            }
        }

        // Build the body of the verification post request, adding the _notify-validate command.
        $req = 'cmd=_notify-validate';
        $get_magic_quotes_exists = false;
        foreach ($myPost as $key => $value) {
            $value = urlencode($value);
            $req .= "&$key=$value";
        }

        // Post the data back to Paypal, using curl.
        $ch = curl_init($this->getPaypalUri());
        curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
        curl_setopt($ch, CURLOPT_SSLVERSION, 6);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);

        // This is often required if the server is missing a global cert bundle, or is using an outdated one.
        if ($this->use_local_certs) {
            curl_setopt($ch, CURLOPT_CAINFO, __DIR__ . "/cacert.pem");
        }
        curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'User-Agent: PHP-IPN-Verification-Script',
            'Connection: Close',
        ));
        $res = curl_exec($ch);
        if (!($res)) {
            $errno = curl_errno($ch);
            $errstr = curl_error($ch);
            curl_close($ch);
            printlog('paypal.ipv', "cURL error: [$errno] $errstr");
        }

        $info = curl_getinfo($ch);
        $http_code = $info['http_code'];
        if ($http_code != 200) {
            printlog('paypal.ipv', "Paypal responded with http code $http_code");
        }

        curl_close($ch);

        // Check if Paypal verifies the IPN data, and if so, return true.
        if ($res == self::VALID) {
            return true;
        } else {
            return false;
        }
    }

}
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