I have an Electron app with In-App Purchases integrated.
The In-App Purchases themselves are working - I can pull down the price and display it - and the user can buy the IAP. However, I'm having trouble validating the Apple receipt.
I'm using this apple-store-receipt-validator-in-php PHP script to validate the Apple receipt. And this works fine if I use the default encoded receipt data ("ewoJInNpZ25hdHVyZSIgPSAiQX..." - line 18 on the PHP script) where I get this response:
{
"receipt":{
"original_purchase_date_pst":"2012-04-30 08:05:55 America\/Los_Angeles",
"original_transaction_id":"1000000046178817",
"original_purchase_date_ms":"1335798355868",
"transaction_id":"1000000046178817",
"quantity":"1",
"product_id":"com.mindmobapp.download",
"bvrs":"20120427",
"purchase_date_ms":"1335798355868",
"purchase_date":"2012-04-30 15:05:55 Etc\/GMT",
"original_purchase_date":"2012-04-30 15:05:55 Etc\/GMT",
"purchase_date_pst":"2012-04-30 08:05:55 America\/Los_Angeles",
"bid":"com.mindmobapp.MindMob",
"item_id":"521129812"
},
"status":0
}
However, when I read the Apple receipt file, base64 encode it and post it to the validator script within Electron, I get the following response:
{
status:21002
}
According to the Apple Developer site, this error code means:
The data in the receipt-data property was malformed or missing.
Here is how I'm reading the Apple receipt, base64 encoding it and sending it to the php script:
inAppPurchase.on('transactions-updated', (event, transactions) => {
transactions.forEach(function (transaction) {
var payment = transaction.payment
switch (transaction.transactionState) {
case 'purchased':
// Get the receipt url.
let receiptURL = inAppPurchase.getReceiptURL()
// get receipt data from file
var receiptRaw = fs.readFileSync(receiptURL)
// base64 encode the receipt data
var receiptEncoded = receiptRaw.toString('base64')
// submit the receipt file to the server and check if it is valid
$this.$axios({
method: 'POST',
headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
data: {
res: receiptEncoded
},
url: 'http://temp.dconnell.co.uk'
}).then(function (response) {
console.log('response: ', response);
if (!response.data.status) {
console.log('Valid receipt.');
}
else {
console.log('Invalid receipt!');
}
}).catch(function (error) {
console.log(error);
});
// Finish the transaction.
inAppPurchase.finishTransactionByDate(transaction.transactionDate)
break
default:
break
}
})
})
I've also tried using the js-base64 library to encode the Apple receipt data instead, to no avail:
var receiptEncoded = Base64.encode(receiptRaw)
Here is the server side code I'm using:
<?php
error_reporting(-1);
if(empty($_SERVER['CONTENT_TYPE']))
{
$_SERVER['CONTENT_TYPE'] = "application/x-www-form-urlencoded";
}
header("Access-Control-Allow-Origin: *");
#######################################################################
#######################################################################
## ##
## ##
## PROGRAMMED BY AMIN MAHDI MAMDOOH (ARS NETWORK DEVELOPER TEAMS), ##
## ARS Network (M) Sdn. Bhd. , http://www.ars-network.com ##
## http://www.ARSgroupco.com , http://www.mamdooh.me ##
## ##
## Copyright (c) 2000-2015 ARSgroupco.com ##
## Created @ 2015.01.28 ##
## iOS Web Application Control Panel VERSION 2.00 ##
## ##
## ##
#######################################################################
#######################################################################
// $res = "ewoJInNpZ25hdHVyZSIgPSAiQXBNVUJDODZBbHpOaWtWNVl0clpBTWlKUWJLOEVk
// ZVhrNjNrV0JBWHpsQzhkWEd1anE0N1puSVlLb0ZFMW9OL0ZTOGNYbEZmcDlZWHQ5
// aU1CZEwyNTBsUlJtaU5HYnloaXRyeVlWQVFvcmkzMlc5YVIwVDhML2FZVkJkZlcr
// T3kvUXlQWkVtb05LeGhudDJXTlNVRG9VaFo4Wis0cFA3MHBlNWtVUWxiZElWaEFB
// QURWekNDQTFNd2dnSTdvQU1DQVFJQ0NHVVVrVTNaV0FTMU1BMEdDU3FHU0liM0RR
// RUJCUVVBTUg4eEN6QUpCZ05WQkFZVEFsVlRNUk13RVFZRFZRUUtEQXBCY0hCc1pT
// QkpibU11TVNZd0pBWURWUVFMREIxQmNIQnNaU0JEWlhKMGFXWnBZMkYwYVc5dUlF
// RjFkR2h2Y21sMGVURXpNREVHQTFVRUF3d3FRWEJ3YkdVZ2FWUjFibVZ6SUZOMGIz
// SmxJRU5sY25ScFptbGpZWFJwYjI0Z1FYVjBhRzl5YVhSNU1CNFhEVEE1TURZeE5U
// SXlNRFUxTmxvWERURTBNRFl4TkRJeU1EVTFObG93WkRFak1DRUdBMVVFQXd3YVVI
// VnlZMmhoYzJWU1pXTmxhWEIwUTJWeWRHbG1hV05oZEdVeEd6QVpCZ05WQkFzTUVr
// RndjR3hsSUdsVWRXNWxjeUJUZEc5eVpURVRNQkVHQTFVRUNnd0tRWEJ3YkdVZ1NX
// NWpMakVMTUFrR0ExVUVCaE1DVlZNd2daOHdEUVlKS29aSWh2Y05BUUVCQlFBRGdZ
// MEFNSUdKQW9HQkFNclJqRjJjdDRJclNkaVRDaGFJMGc4cHd2L2NtSHM4cC9Sd1Yv
// cnQvOTFYS1ZoTmw0WElCaW1LalFRTmZnSHNEczZ5anUrK0RyS0pFN3VLc3BoTWRk
// S1lmRkU1ckdYc0FkQkVqQndSSXhleFRldngzSExFRkdBdDFtb0t4NTA5ZGh4dGlJ
// ZERnSnYyWWFWczQ5QjB1SnZOZHk2U01xTk5MSHNETHpEUzlvWkhBZ01CQUFHamNq
// QndNQXdHQTFVZEV3RUIvd1FDTUFBd0h3WURWUjBqQkJnd0ZvQVVOaDNvNHAyQzBn
// RVl0VEpyRHRkREM1RllRem93RGdZRFZSMFBBUUgvQkFRREFnZUFNQjBHQTFVZERn
// UVdCQlNwZzRQeUdVakZQaEpYQ0JUTXphTittVjhrOVRBUUJnb3Foa2lHOTJOa0Jn
// VUJCQUlGQURBTkJna3Foa2lHOXcwQkFRVUZBQU9DQVFFQUVhU2JQanRtTjRDL0lC
// M1FFcEszMlJ4YWNDRFhkVlhBZVZSZVM1RmFaeGMrdDg4cFFQOTNCaUF4dmRXLzNl
// VFNNR1k1RmJlQVlMM2V0cVA1Z204d3JGb2pYMGlreVZSU3RRKy9BUTBLRWp0cUIw
// N2tMczlRVWU4Y3pSOFVHZmRNMUV1bVYvVWd2RGQ0TndOWXhMUU1nNFdUUWZna1FR
// Vnk4R1had1ZIZ2JFL1VDNlk3MDUzcEdYQms1MU5QTTN3b3hoZDNnU1JMdlhqK2xv
// SHNTdGNURXFlOXBCRHBtRzUrc2s0dHcrR0szR01lRU41LytlMVFUOW5wL0tsMW5q
// K2FCdzdDMHhzeTBiRm5hQWQxY1NTNnhkb3J5L0NVdk02Z3RLc21uT09kcVRlc2Jw
// MGJzOHNuNldxczBDOWRnY3hSSHVPTVoydG04bnBMVW03YXJnT1N6UT09IjsKCSJw
// dXJjaGFzZS1pbmZvIiA9ICJld29KSW05eWFXZHBibUZzTFhCMWNtTm9ZWE5sTFdS
// aGRHVXRjSE4wSWlBOUlDSXlNREV5TFRBMExUTXdJREE0T2pBMU9qVTFJRUZ0WlhK
// cFkyRXZURzl6WDBGdVoyVnNaWE1pT3dvSkltOXlhV2RwYm1Gc0xYUnlZVzV6WVdO
// MGFXOXVMV2xrSWlBOUlDSXhNREF3TURBd01EUTJNVGM0T0RFM0lqc0tDU0ppZG5K
// eklpQTlJQ0l5TURFeU1EUXlOeUk3Q2draWRISmhibk5oWTNScGIyNHRhV1FpSUQw
// Z0lqRXdNREF3TURBd05EWXhOemc0TVRjaU93b0pJbkYxWVc1MGFYUjVJaUE5SUNJ
// eElqc0tDU0p2Y21sbmFXNWhiQzF3ZFhKamFHRnpaUzFrWVhSbExXMXpJaUE5SUNJ
// eE16TTFOems0TXpVMU9EWTRJanNLQ1NKd2NtOWtkV04wTFdsa0lpQTlJQ0pqYjIw
// dWJXbHVaRzF2WW1Gd2NDNWtiM2R1Ykc5aFpDSTdDZ2tpYVhSbGJTMXBaQ0lnUFNB
// aU5USXhNVEk1T0RFeUlqc0tDU0ppYVdRaUlEMGdJbU52YlM1dGFXNWtiVzlpWVhC
// d0xrMXBibVJOYjJJaU93b0pJbkIxY21Ob1lYTmxMV1JoZEdVdGJYTWlJRDBnSWpF
// ek16VTNPVGd6TlRVNE5qZ2lPd29KSW5CMWNtTm9ZWE5sTFdSaGRHVWlJRDBnSWpJ
// d01USXRNRFF0TXpBZ01UVTZNRFU2TlRVZ1JYUmpMMGROVkNJN0Nna2ljSFZ5WTJo
// aGMyVXRaR0YwWlMxd2MzUWlJRDBnSWpJd01USXRNRFF0TXpBZ01EZzZNRFU2TlRV
// Z1FXMWxjbWxqWVM5TWIzTmZRVzVuWld4bGN5STdDZ2tpYjNKcFoybHVZV3d0Y0hW
// eVkyaGhjMlV0WkdGMFpTSWdQU0FpTWpBeE1pMHdOQzB6TUNBeE5Ub3dOVG8xTlNC
// RmRHTXZSMDFVSWpzS2ZRPT0iOwoJImVudmlyb25tZW50IiA9ICJTYW5kYm94IjsK
// CSJwb2QiID0gIjEwMCI7Cgkic2lnbmluZy1zdGF0dXMiID0gIjAiOwp9";
if (isset($_GET['res'])) {
$res = $_GET['res'];
}
// iTunes Validator V2 Start Function
function receipt_Result_ITC($isSandbox,$receipt_data) {
if ($isSandbox) {
$url = "https://sandbox.itunes.apple.com/verifyReceipt/";
}
else {
$url = "https://buy.itunes.apple.com/verifyReceipt";
}
$ch = curl_init($url);
$data_string = json_encode(array(
'receipt-data' => $receipt_data
));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data_string))
);
$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if (200 != $httpCode) {
echo "Error validating App Store transaction receipt. Response HTTP code $httpCode";
}
$decoded = json_decode($output, TRUE);
return $decoded;
}
// iTunes Validator V2 End Function
$result = receipt_Result_ITC (true,$res);
$jsonResult = json_encode($result);
echo $jsonResult;
?>
I believe I'm not reading and / or encoding the Apple receipt file data correctly before sending. How can I do this correctly?
This is the result of var receiptEncoded = receiptRaw.toString('base64'):
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
Or if I use var receiptEncoded = Base64.encode(receiptRaw) then this is the result:
0��	*�H�����0��10	+ 0�c	*�H����T�P1�L0
 0 0 00 0 00
4+0O�01.00	P25003.1.00Us��c]�/8���W0 ProductionSandbox0����c�v'e�P�����02019-02-28T11:30:40Z02013-08-01T07:00:00Z0( com.dannyconnell.emailsnippets0=5.p�)�?�K2�TMP����c���F~�bf�Ж�Vn��a�A���X���T��0RJ���� ;v7���;�'ç���_��eW4�A���׼��K�PUb�٬���,�\���	H�1�ث�0�P�F1�B0� 0� 0� 0� 0� 0� 0� 0� 0�0� 0� 0� 0� 0�pro.upgrade0�10000005003941320�10000005003941320�2019-02-06T10:53:00Z0�2019-02-06T10:53:00Z��e0�|0�d��W��	�0	*�H�� 0��10	UUS10U

Apple Inc.1,0*U#Apple Worldwide Developer Relations1D0BU;Apple Worldwide Developer Relations Certification Authority0151113021509Z230207214847Z0��1705U.Mac App Store and iTunes Store Receipt Signing1,0*U#Apple Worldwide Developer Relations10U

Apple Inc.10	UUS0�"0	*�H�� � 0�
� �ρ�%��[և�#�3��#���&�=Ɵ�JU���ח�9Tm}�T��,Rq�d{�Ή�I�崈q�?[F.����X�>!x�۷Ў��L[*h7����ҡJXR������5-��ʍH��XxTk�16JGT�7�����}_��J���຤���c�+���>o���<��R�%
v������k�[^�sQIV��C�̎�Р��\��ii��h&&9�s�
]�s��v;�-و�������&U���I# ���0��0?+3010/+0�#http://ocsp.apple.com/ocsp03-wwdr040U�����v�����M��6]�+�0U�0 0U#0��'	��`����GY�RT��0�U �0�0�
*�H��cd0��0��+0����Reliance on this certificate by any party assumes acceptance of the then applicable standard terms and conditions of use, certificate policy and certification practice statements.06+*http://www.apple.com/certificateauthority/0U��0
*�H��cd 0	*�H�� � ��.=�[+nB�l��C0�_�\э����%�ی�ÀY����.�۶���5.|˭k��w��g��^��v�Z ��c�s�������eH\��(:�7-��9s�����**n+�� \��}'�3����D۱Lg�n
O���җ�kQ�Z�ue�b��_���hْ ������ d�X`�|��u�i�[*�hn�B�L�7��;zC�m�H`6�+����-#Ў��i���{9GE0a/��0�"0�
�޼�9m�0	*�H�� 0b10	UUS10U

Apple Inc.1&0$UApple Certification Authority10UApple Root CA0130207214847Z230207214847Z0��10	UUS10U

Apple Inc.1,0*U#Apple Worldwide Developer Relations1D0BU;Apple Worldwide Developer Relations Certification Authority0�"0	*�H�� � 0�
� �8T��V��$9H���_�&��4Sz�|c�awd^�#�9�P-VXp-~�n�J�>/�ބ�Wɯ{�j�I���*2�chR=���k���}�g���7j�	��g�Qd��\ѼWng5�v6���n8��+N{%�Z�N���ғ�q�`��3NU�X����wE�PH�+-䔅��ĝ�h����g~p�YKwB�9����L��;H���!]�jj��5`���F)��Ë�y�jag����h�b_nϙ��c��e� ���0��0U�'	��`����GY�RT��0U�0�0U#0�+�iG�v	��k�.@��GM^0.U'0%0#�!��http://crl.apple.com/root.crl0U��0
*�H��cd 0	*�H�� � O��Y�,��l/���2�5�n�}�i���w,�g���m:Y\߃���*ar����E0����G�񓊣t��Ør�;>�E�T�2��Sk
N��Pl!�
�NW�k[<=����#J&�?���L�mW�zX�{h�䆌J��I���U ���K0�ᠱ�)��	w�4����
�;���b��cA��;L��۫�ɕ�O�M�&�����)�zf�.��!���xၮ�Ӑ�����8�g0Q�\�q���l0��0���0	*�H�� 0b10	UUS10U

Apple Inc.1&0$UApple Certification Authority10UApple Root CA0060425214036Z350209214036Z0b10	UUS10U

Apple Inc.1&0$UApple Certification Authority10UApple Root CA0�"0	*�H�� � 0�
� 䑩	��GP��^y�-�6�WLU����Kl��"0�>�P	�A�����f�$kУ��*���z�G�[�73��M�i��r�]�_��%�U�M]�d5#KY�������P��XPg�� �ˬ, op�?0��C��=�+I(��ε��^��=�:�� ��!.t�<�b��q�GSU��/A����p��LE~LkP�A��tb�A�3���0X�Z2�h���es�g^e�I�v�3e�w��- ��z0�v0U�0U�0�0U+�iG�v	��k�.@��GM^0U#0�+�iG�v	��k�.@��GM^0�U �0�0� 	*�H��cd0��0*+https://www.apple.com/appleca/0��+0����Reliance on this certificate by any party assumes acceptance of the then applicable standard terms and conditions of use, certificate policy and certification practice statements.0	*�H�� � \6�L-x�팛��w��v�w0O�����=G7�@�,Ա�ؾ�s���d�yO4آ>�x�k��}9��S �8ı��O
k�+�Y�	|@Vtӷ�#;G��o$��ѷp�E�'��mx����~"5�%���kԢ$#����s�`�[	/���DH�`8��=&g �3j�����/�Sj[d�c3w�:,V��!ںsO��6��U٧��2B���q�~�R���B$*��M�^c�K�P�������	7�uu!1��0��0��0��10	UUS10U

Apple Inc.1,0*U#Apple Worldwide Developer Relations1D0BU;Apple Worldwide Developer Relations Certification Authority�W��	�0	+ 0	*�H�� � 5 �>�K[�u<\�̞��-=̖�q����)�F��<��:{^7:�>���l1��c%-��&�=���=J ��J=͓���	jB�T�|S��sCI�+�� t�1c+�?��M#-�[��W�Ϊ��D���?:�������sey���E7�d[�@z5j��Bg�B�cL[	�t��/��y���&��8�cL m��t4�P޼�\h�Ou/{�APq�g��m�]���7���+R|c�֭r
Also, here is the result of let receiptURL = inAppPurchase.getReceiptURL():
/Applications/MAMP/htdocs/email-snippets/node_modules/electron/dist/Electron.app/Contents/_MASReceipt/receipt
The server-side works and receiptRaw.toString('base64') is correct.
If I send the following to https://sandbox.itunes.apple.com/verifyReceipt/ I get "status": 0 (so it works).
{
"receipt-data": "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"
}
However, your server decodes the parameter when you call $_GET['res'].
The GET variables are passed through urldecode(). (http://php.net/manual/en/reserved.variables.get.php)
So what you send to the Apple's verification endpoint is not a base64 encoded receipt.
Moreover, you use $_GET['res'] while you call your server with a POST.
I suggest you to use $res = $_POST['res'] or Content-Type: application/json instead of application/x-www-form-urlencoded (see https://www.stevenrombauts.be/2018/06/read-json-request-data-with-php/).