app_loader.py

#!/usr/bin/env python3
"""
Encrypted Code Loader - Hugging Face Space Entry Point

This file decrypts and executes the encrypted app.py.
DECRYPT_KEY must be stored in Hugging Face Space Secrets.
"""

import os
import sys
from cryptography.fernet import Fernet

# List of files to decrypt
ENCRYPTED_FILES = {
    "app.py.encrypted": "app.py",
}


def decrypt_file(encrypted_path, decrypted_path, key):
    """Decrypts an encrypted file."""
    cipher = Fernet(key)
    
    # Read encrypted file
    with open(encrypted_path, 'rb') as f:
        encrypted_data = f.read()
    
    # Decrypt
    try:
        decrypted_data = cipher.decrypt(encrypted_data)
    except Exception as e:
        print(f"❌ Decryption failed for {encrypted_path}: {e}")
        print("   Please check that DECRYPT_KEY is correctly set in Space Secrets.")
        sys.exit(1)
    
    # Save decrypted file to temporary location (current directory in this case)
    with open(decrypted_path, 'wb') as f:
        f.write(decrypted_data)
    
    print(f"✓ Decrypted: {encrypted_path} → {decrypted_path} ({len(decrypted_data):,} bytes)")


def main():
    print("=" * 60)
    print("🔓 Decrypting source code...")
    print("=" * 60)
    
    # Get decryption key from Secrets
    key_str = os.getenv("DECRYPT_KEY")
    if not key_str:
        print("❌ ERROR: DECRYPT_KEY not found in environment variables!")
        print("   Please set DECRYPT_KEY in Hugging Face Space Secrets.")
        print("   Go to: Settings → Variables and secrets → Add secret")
        sys.exit(1)
    
    try:
        key = key_str.encode('utf-8')
        cipher = Fernet(key)  # Validate key
    except Exception as e:
        print(f"❌ Invalid DECRYPT_KEY: {e}")
        sys.exit(1)
    
    print(f"✓ DECRYPT_KEY loaded from secrets")
    print()
    
    # Decrypt files
    for encrypted_file, decrypted_file in ENCRYPTED_FILES.items():
        if not os.path.exists(encrypted_file):
            print(f"⚠️  Warning: {encrypted_file} not found, skipping...")
            continue
        decrypt_file(encrypted_file, decrypted_file, key)
    
    print()
    print("=" * 60)
    print("✅ Decryption complete! Starting application...")
    print("=" * 60)
    print()
    
    # Execute decrypted app.py
    # app.py automatically launches the Gradio app upon import
    import app
    
    # Explicitly launch if a demo object exists
    if hasattr(app, 'demo'):
        print("✓ Launching Gradio app...")
        app.demo.launch()


if __name__ == "__main__":
    main()