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Edit File: SignatureBodyFormHandler.php

<?php

namespace Vonage\Client\Credentials\Handler;

use Psr\Http\Message\RequestInterface;
use Vonage\Client\Credentials\CredentialsInterface;
use Vonage\Client\Credentials\SignatureSecret;
use Vonage\Client\Signature;

class SignatureBodyFormHandler extends AbstractHandler
{
    public function __invoke(RequestInterface $request, CredentialsInterface $credentials): RequestInterface
    {
        $credentials = $this->extract(SignatureSecret::class, $credentials);
        $credentialsArray = $credentials->asArray();

$body = $request->getBody();
        $body->rewind();
        $content = $body->getContents();
        $params = [];
        parse_str($content, $params);
        $params['api_key'] = $credentialsArray['api_key'];

$signature = new Signature(
            $params,
            $credentialsArray['signature_secret'],
            $credentialsArray['signature_method']
        );

$params = $signature->getSignedParams();
        $body->rewind();
        $body->write(http_build_query($params, '', '&'));

return $request;
    }
}

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