Convert base64 string to blob and upload it to REST API using PHP

Question

I need to upload a file (actually, it's a base64 string that is retrieved from another REST API) to a REST API that will accept blob as file content. In javascript, what I need to do is convert that base64 string to blob data, and pass it to a FormData and post it to the API endpoint.

I just don't know how to do that with PHP, using GuzzleHttp Client.

I hope someone with PHP skill can show me how to do that in PHP. I searched on Google but didn't seem to find a solution for me so far.

Thank you so much.

Answer 1

Just a rough and simple idea... i added as much comments i could to make it understandable... Hope this works out for you!

$base64String = 'your_base64_encoded_data_here'; // base64 string
//decode the base64 string and write it to a temporary file:
$decodedData = base64_decode($base64String);

$tempFilePath = tempnam(sys_get_temp_dir(), 'upload');
//replace sys_get_temp_dir() with your custom dir if you want to change

file_put_contents($tempFilePath, $decodedData);

//or use fwrite 
//fwrite(fopen($tempFilePath,"w+"),$decodedData);

Use Guzzle to create a request and upload the file:

require 'vendor/autoload.php';

use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\Psr7\MultipartStream;

$apiUrl = 'https://your_api.com/upload'; // replace with your api endpoint

$client = new Client();

// prepare data for multipart/form-data
$multipart = new MultipartStream([
    [
        'name'     => 'file', // form field name
        'contents' => fopen($tempFilePath, 'r'),
        'filename' => 'uploaded_file' // file name
    ]
]);

// create a psr-7 request object
$request = new Request('POST', $apiUrl, ['Content-Type' => 'multipart/form-data; boundary=' . $multipart->getBoundary()], $multipart);

// send request
$response = $client->send($request);

// final response
echo $response->getBody();

// delete the temporary file
unlink($tempFilePath);
//Or move to a a folder and schedule a cronjob to clean up the folder