PHP STEPS: jwt

Saturday, May 12, 2018

Verify Firebase ID Token Using Plain PHP Script Codes

1) Add PHP-JWT Library to your PHP project.

Use composer, or add the library manually.

To use composer, follow the guide here, https://firebase-php.readthedocs.io/en/latest/overview.html.

To add the library manually, download the php-jwt library from https://php-download.com/ .

For example, if you want to download version 4, (https://php-download.com/downloads/download?vendor=firebase&package=php-jwt&version=4.0.0.0&downloadType=REQUIRE)

Alternatively, you can download php-jwt library from here, (https://drive.google.com/open?id=1IHUWJQTKEy1hjKLyIICJj0ITBXaDNTkI ).

Unzip the package, find the folder php-jwt and copy the folder to your project.

the php-jwt is added to the project folder phpjwtdecode

2) Write the PHP script

filename: phpjwtdecode.php

<html>
<style>
div{
width:400px;
color:red;
padding: 3px; 
word-break: break-all; 
word-wrap: break-word;
}
</style>
<body>
<?php
require 'php-jwt/src/JWT.php';
require 'php-jwt/src/SignatureInvalidException.php';
require 'php-jwt/src/BeforeValidException.php';
require 'php-jwt/src/ExpiredException.php';

use \Firebase\JWT\JWT;

function decode($jwt){
//echo "token:".$jwt;
//echo "<br/>";

try{
 $tks = explode('.', $jwt);
 list($headb64, $bodyb64, $cryptob64) = $tks;
 $header = \Firebase\JWT\JWT::jsonDecode(Firebase\JWT\JWT::urlsafeB64Decode($headb64));
 $kid=$header->kid;

}catch (Exception $e){
 $kid="";
}

$strPublicKeys = file_get_contents
("https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com");
     
$jsonPublicKeys = json_decode($strPublicKeys, true);
if(isset($jsonPublicKeys[$kid])){

$publicKey  = $jsonPublicKeys[$kid];
  try{
   $decoded = JWT::decode($jwt, $publicKey, array('RS256'));

}catch (Exception $e){
   // die($e);
   $decoded ="";
    
         }

}else{
 $decoded ="";

}

//var_dump($decoded);
echo "<div>
Your decoded token codes:<br/>";
echo json_encode($decoded);
echo "</div>
";

}
?>

<?php if (isset($_GET["token"])){decode($_GET["token"]);}?>

<hr/>

<form action="phpjwtdecode.php" method="GET">
Enter your token:
<br/> 
<textarea name="token"  rows="20" cols="50">
<br/>
<input type="submit">
</form>
</body>
</html>

3) Execute

FURTHER READING:
https://firebase-php.readthedocs.io/en/stable/authentication.html

Saturday, May 12, 2018

Verify Firebase ID Token Using Plain PHP Script Codes

1) Add PHP-JWT Library to your PHP project.

2) Write the PHP script

3) Execute

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