kalvados

Kalvados

Kalvados is an Apple receipt generator for testing.

You can use kalvados to get base64 encoded bynary receipt data from JSON.

JSON format that kalvados can parse is like this.

{
  "receipt_type": "ProductionSandbox",
  "adam_id": 0,
  "app_item_id": 0,
  "bundle_id": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
  "application_version": "1",
  "download_id": 0,
  "version_external_identifier": 0,
  "receipt_creation_date": "2017-04-07 03:53:44 Etc/GMT",
  "receipt_creation_date_ms": "1491537224000",
  "receipt_creation_date_pst": "2017-04-06 20:53:44 America/Los_Angeles",
  "request_date": "2018-02-21 00:13:33 Etc/GMT",
  "request_date_ms": "1519172013493",
  "request_date_pst": "2018-02-20 16:13:33 America/Los_Angeles",
  "original_purchase_date": "2013-08-01 07:00:00 Etc/GMT",
  "original_purchase_date_ms": "1375340400000",
  "original_purchase_date_pst": "2013-08-01 00:00:00 America/Los_Angeles",
  "original_application_version": "1.0",
  "in_app": [
    {
      "quantity": "1",
      "product_id": "XXXXXXXXXXXXXXXXXXXXXXXXXXXX",
      "transaction_id": "1000000288468336",
      "original_transaction_id": "1000000288468336",
      "purchase_date": "2017-04-07 03:47:41 Etc/GMT",
      "purchase_date_ms": "1491536861000",
      "purchase_date_pst": "2017-04-06 20:47:41 America/Los_Angeles",
      "original_purchase_date": "2017-04-07 03:47:41 Etc/GMT",
      "original_purchase_date_ms": "1491536861000",
      "original_purchase_date_pst": "2017-04-06 20:47:41 America/Los_Angeles",
      "is_trial_period": "false"
    }
  ]
}

Usage

As a receipt generator command line tool

Install kalvados command.

go get github.com/aktsk/kalvados/cmd/kalvados

Run kalvados command.

cat receipt.json | kalvados -keyFile key.pem -certFile cert.pem

As a receipt generator server

Install kalvados-server command.

go get github.com/aktsk/kalvados/cmd/kalvados-server

Run kalvados-server command.

kalvados-server -keyFile key.pem -certFile cert.pem

As a receipt generator library

package main

import (
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"os"

	"github.com/aktsk/kalvados/receipt"
)

func main() {
	jsonFile, _ := os.Open("receipt.json")
	receiptJSON, _ := ioutil.ReadAll(jsonFile)
	jsonFile.Close()

	keyFile, _ := os.Open("key.pem")
	keyPEM, _ := ioutil.ReadAll(keyFile)
	keyFile.Close()
	keyDER, _ := pem.Decode(keyPEM)
	key, _ := x509.ParsePKCS1PrivateKey(keyDER.Bytes)

	certFile, _ := os.Open("cert.pem")
	certPEM, _ := ioutil.ReadAll(certFile)
	certFile.Close()
	certDER, _ := pem.Decode(certPEM)
	cert, _ := x509.ParseCertificate(certDER.Bytes)

	rcpt, _ := receipt.Encode(receiptJSON, key, cert)

	fmt.Println(rcpt)
}

Deploy kalvados server to Google App Engine

You can run kalvados server on Google App Engine.

cd appengine/app
make deploy

Before deploy, you should put your private key file as key.pem and certificate file as cert.pem under appengine/app directory. Or you can set your private key and certificate in app.yaml like this.

In app.yaml:

env_variables:
  # It seems GAE/Go could not handle environment variables
  # that has return code.So use ">-" to replace return code
  # with white space
  CERTIFICATE: >-
    -----BEGIN CERTIFICATE-----
    MIIB2zCCAUSgAwIBAgIEOZu39TANBgkqhkiG9w0BAQsFADApMRAwDgYDVQQKEwdB
    Y21lIENvMRUwEwYDVQQDEwxFZGRhcmQgU3RhcmswIBcNMTgwMzE5MTY1MzA1WhgP
    MjM4MzAzMTkxNjUzMDVaMCUxEDAOBgNVBAoTB0FjbWUgQ28xETAPBgNVBAMTCEpv
    biBTbm93MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJxF2I+OtGLk/7yY6+
    IcXv9XI9cBg30QOPjdZt6hP9MEZJkIk4LIKnxFbm4GBQ0Zf3MCovoL7lp7h6DSAN
    mj7QRy6XZqAkW3D+qF6bGRNiw/3PwUw0HpuvGkbGY4d8VmMG0Jia9iF/B4f1fRIy
    39k3ILBXDZ66TE9dryFxkgLIxwIDAQABoxIwEDAOBgNVHQ8BAf8EBAMCBaAwDQYJ
    KoZIhvcNAQELBQADgYEASHF7Wl2kRj294uM6WahMjklLj0kHRX9ZQ2xbezKf4P/Z
    o7d2zZ6xiB44wfoK/uEGfjL59Qe17mkOVamXMFMAWmVgtZzOzGkUzn45H7vmfQX+
    HA/9anzcllC0cswK7g60a7cULdcVxgsaI2q3mGL4UitneeO+BtSSSg5fLcPHZW8=
    -----END CERTIFICATE-----

includes:
  - secret.yaml

In secret.yaml (Do not commit and push this file to SCM):

env_variables:
  # It seems GAE/Go could not handle environment variables
  # that has return code.So use ">-" to replace return code
  # with white space
  PRIVATE_KEY: >-
    -----BEGIN PRIVATE KEY-----
    MIICXAIBAAKB.....
    .....
    .....
    .....
    .....
    .....
    -----END PRIVATE KEY-----

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

License

See LICENSE.

See Also

• Receipt Validation Programming Guide
• aktsk/nolmandy: Apple receipt processing server/library