Image Generation or Editing Callbacks

from flask import Flask, request, jsonify
import requests
import os

app = Flask(__name__)

@app.route('/nanobanana-image-callback', methods=['POST'])
def handle_callback():
    data = request.json
    
    code = data.get('code')
    msg = data.get('msg')
    callback_data = data.get('data', {})
    task_id = callback_data.get('taskId')
    info = callback_data.get('info', {})
    result_image_url = info.get('resultImageUrl')
    
    print(f"Received NanoBanana image generation callback:")
    print(f"Task ID: {task_id}")
    print(f"Status: {code}, Message: {msg}")
    
    if code == 200:
        # Task completed successfully
        print("NanoBanana image generation completed successfully")
        
        print(f"Generated image URL: {result_image_url}")
        
        # Download the generated image
        if result_image_url:
            try:
                result_filename = f"nanobanana_result_{task_id}.jpg"
                download_file(result_image_url, result_filename)
                print(f"Generated image downloaded as {result_filename}")
            except Exception as e:
                print(f"Failed to download generated image: {e}")
                
    else:
        # Task failed
        print(f"NanoBanana image generation failed: {msg}")
        
        # Handle specific error types
        if code == 400:
            print("Content policy violation - please adjust your prompt")
        elif code == 500:
            print("Internal error - please try again later")
        elif code == 501:
            print("Generation task failed - may need to adjust parameters")
    
    # Return 200 status code to confirm callback receipt
    return jsonify({'status': 'received'}), 200

def download_file(url, filename):
    """Download file from URL and save locally"""
    response = requests.get(url, stream=True)
    response.raise_for_status()
    
    os.makedirs('downloads', exist_ok=True)
    filepath = os.path.join('downloads', filename)
    
    with open(filepath, 'wb') as f:
        for chunk in response.iter_content(chunk_size=8192):
            f.write(chunk)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=3000)

<?php
header('Content-Type: application/json');

// Get POST data
$input = file_get_contents('php://input');
$data = json_decode($input, true);

$code = $data['code'] ?? null;
$msg = $data['msg'] ?? '';
$callbackData = $data['data'] ?? [];
$taskId = $callbackData['taskId'] ?? '';
$info = $callbackData['info'] ?? [];
$resultImageUrl = $info['resultImageUrl'] ?? '';

error_log("Received NanoBanana image generation callback:");
error_log("Task ID: $taskId");
error_log("Status: $code, Message: $msg");

if ($code === 200) {
    // Task completed successfully
    error_log("NanoBanana image generation completed successfully");
    
    error_log("Generated image URL: $resultImageUrl");
    
    // Download the generated image
    if (!empty($resultImageUrl)) {
        try {
            $resultFilename = "nanobanana_result_{$taskId}.jpg";
            downloadFile($resultImageUrl, $resultFilename);
            error_log("Generated image downloaded as $resultFilename");
        } catch (Exception $e) {
            error_log("Failed to download generated image: " . $e->getMessage());
        }
    }
    
} else {
    // Task failed
    error_log("NanoBanana image generation failed: $msg");
    
    // Handle specific error types
    if ($code === 400) {
        error_log("Content policy violation - please adjust your prompt");
    } elseif ($code === 500) {
        error_log("Internal error - please try again later");
    } elseif ($code === 501) {
        error_log("Generation task failed - may need to adjust parameters");
    }
}

// Return 200 status code to confirm callback receipt
http_response_code(200);
echo json_encode(['status' => 'received']);

function downloadFile($url, $filename) {
    $downloadDir = 'downloads';
    if (!is_dir($downloadDir)) {
        mkdir($downloadDir, 0755, true);
    }
    
    $filepath = $downloadDir . '/' . $filename;
    
    $fileContent = file_get_contents($url);
    if ($fileContent === false) {
        throw new Exception("Failed to download file from URL");
    }
    
    $result = file_put_contents($filepath, $fileContent);
    if ($result === false) {
        throw new Exception("Failed to save file locally");
    }
}
?>