Upload Files to the Gemini API

Gemini.php

<?php

namespace App\Services\google;

use Exception;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Support\Facades\Http;

class Gemini
{
    private string $baseUrl = 'https://generativelanguage.googleapis.com/upload/v1beta/files';
    private string $apiKey;

    public function __construct(string $apiKey)
    {
        $this->apiKey = $apiKey;
    }

    /**
     * @throws ConnectionException
     * @throws Exception
     */
    public function uploadFile(string $filePath, string $displayName): array
    {
        $fileSize = filesize($filePath);
        $mimeType = mime_content_type($filePath);

        // Initial resumable request
        $response = Http::withHeaders([
                                          'X-Goog-Upload-Protocol'              => 'resumable',
                                          'X-Goog-Upload-Command'               => 'start',
                                          'X-Goog-Upload-Header-Content-Length' => $fileSize,
                                          'X-Goog-Upload-Header-Content-Type'   => $mimeType,
                                          'Content-Type'                        => 'application/json',
                                      ])->post($this->baseUrl . '?key=' . $this->apiKey, [
            'file' => ['display_name' => $displayName]
        ]);

        $uploadUrl = $response->header('X-Goog-Upload-URL');

        if (!$uploadUrl) {
            throw new \RuntimeException('Failed to get upload URL');
        }

        // Upload the actual bytes
        $fileContent    = file_get_contents($filePath);
        $uploadResponse = Http::withHeaders([
                                                'Content-Length'        => $fileSize,
                                                'X-Goog-Upload-Offset'  => 0,
                                                'X-Goog-Upload-Command' => 'upload, finalize',
                                            ])->withBody($fileContent, $mimeType)
                              ->post($uploadUrl);

        return $uploadResponse->json();
    }
}