Elept Multi-Cloud Storage Gateway & Enterprise Media Architecture

public function uploadStream(string $objectKey, $stream, string $mimeType, array $metadata = []): bool {
    $tempStream = fopen('php://temp', 'r+');
    $hashCtx = hash_init('sha256');
    $size = 0;

    // Compute sha256 checksum and calculate stream size on-the-fly
    while (!feof($stream)) {
        $chunk = fread($stream, 8192);
        $size += strlen($chunk);
        hash_update($hashCtx, $chunk);
        fwrite($tempStream, $chunk);
    }
    rewind($tempStream);
    $payloadHash = hash_final($hashCtx);

    // Sign request via custom AWS SigV4 signer without SDK overhead
    $signed = $this->signRequest('PUT', $objectKey, $payloadHash, [
        'content-type' => $mimeType,
        'content-length' => (string)$size
    ]);

    $ch = curl_init($signed['url']);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
    curl_setopt($ch, CURLOPT_INFILE, $tempStream);
    curl_setopt($ch, CURLOPT_INFILESIZE, $size);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $signed['headers']);
    $success = curl_exec($ch) !== false && curl_getinfo($ch, CURLINFO_HTTP_CODE) < 300;
    curl_close($ch);
    fclose($tempStream);
    return $success;
}