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<?php
/*
* Copyright (C) 2013-2016 Mailgun
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Mailgun\Lists;
/**
* This class is used for creating a unique hash for
* mailing list subscription double-opt in requests.
*
* @see https://github.com/mailgun/mailgun-php/blob/master/src/Mailgun/Lists/README.md
*/
class OptInHandler
{
/**
* @param string $mailingList
* @param string $secretAppId
* @param string $recipientAddress
*
* @return string
*/
public function generateHash($mailingList, $secretAppId, $recipientAddress)
{
$innerPayload = ['r' => $recipientAddress, 'l' => $mailingList];
$encodedInnerPayload = base64_encode(json_encode($innerPayload));
$innerHash = hash_hmac('sha1', $encodedInnerPayload, $secretAppId);
$outerPayload = ['h' => $innerHash, 'p' => $encodedInnerPayload];
return urlencode(base64_encode(json_encode($outerPayload)));
}
/**
* @param string $secretAppId
* @param string $uniqueHash
*
* @return array|bool
*/
public function validateHash($secretAppId, $uniqueHash)
{
$decodedOuterPayload = json_decode(base64_decode(urldecode($uniqueHash)), true);
$decodedHash = $decodedOuterPayload['h'];
$innerPayload = $decodedOuterPayload['p'];
$decodedInnerPayload = json_decode(base64_decode($innerPayload), true);
$computedInnerHash = hash_hmac('sha1', $innerPayload, $secretAppId);
if ($computedInnerHash == $decodedHash) {
return ['recipientAddress' => $decodedInnerPayload['r'], 'mailingList' => $decodedInnerPayload['l']];
}
return false;
}
}
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