app.py

from smolagents import CodeAgent, DuckDuckGoSearchTool, HfApiModel,load_tool,tool
import base64
import datetime
import hashlib
import requests
import pytz
import yaml
from tools.final_answer import FinalAnswerTool
from Gradio_UI import GradioUI

# Message encryption/decryption tool
@tool
def my_custom_tool(message: str, action: str, key: str) -> str:
    """
    A tool that encrypts or decrypts messages using Base64 encoding for secure communication.

    Args:
        message: The plaintext to encrypt, or the encrypted text to decrypt.
        action: Either 'encrypt' or 'decrypt'.
        key: The secret key used for both encryption and decryption.
    """
    # Normalize action so "Encrypt" and " encrypt " both work
    action = action.lower().strip()
    if action not in ("encrypt", "decrypt"):
        return "Error: action must be 'encrypt' or 'decrypt'."

    if not key:
        return "Error: key cannot be empty."

    # Derive a fixed-length 32-byte key from the password via SHA-256
    key_bytes = hashlib.sha256(key.encode()).digest()

    if action == "encrypt":
        # XOR each message byte with a repeating key byte, then encode as Base64
        encrypted = bytes(
            b ^ key_bytes[i % len(key_bytes)]
            for i, b in enumerate(message.encode())
        )
        return base64.urlsafe_b64encode(encrypted).decode()

    try:
        # Reverse the process: decode Base64, XOR with the same key, recover plaintext
        encrypted_bytes = base64.urlsafe_b64decode(message.encode())
        decrypted = bytes(
            b ^ key_bytes[i % len(key_bytes)]
            for i, b in enumerate(encrypted_bytes)
        )
        return decrypted.decode()
    except Exception as e:
        return f"Error during decryption: {str(e)}"

@tool
def get_current_time_in_timezone(timezone: str) -> str:
    """A tool that fetches the current local time in a specified timezone.
    Args:
        timezone: A string representing a valid timezone (e.g., 'America/New_York').
    """
    try:
        # Create timezone object
        tz = pytz.timezone(timezone)
        # Get current time in that timezone
        local_time = datetime.datetime.now(tz).strftime("%Y-%m-%d %H:%M:%S")
        return f"The current local time in {timezone} is: {local_time}"
    except Exception as e:
        return f"Error fetching time for timezone '{timezone}': {str(e)}"


final_answer = FinalAnswerTool()

# If the agent does not answer, the model is overloaded, please use another model or the following Hugging Face Endpoint that also contains qwen2.5 coder:
# model_id='https://pflgm2locj2t89co.us-east-1.aws.endpoints.huggingface.cloud' 

model = HfApiModel(
max_tokens=2096,
temperature=0.5,
model_id='Qwen/Qwen2.5-Coder-32B-Instruct',# it is possible that this model may be overloaded
custom_role_conversions=None,
)


# Import tool from Hub
image_generation_tool = load_tool("agents-course/text-to-image", trust_remote_code=True)

with open("prompts.yaml", 'r') as stream:
    prompt_templates = yaml.safe_load(stream)
    
agent = CodeAgent(
    model=model,
    tools=[final_answer, my_custom_tool, get_current_time_in_timezone], ## add your tools here (don't remove final answer)
    max_steps=6,
    verbosity_level=1,
    grammar=None,
    planning_interval=None,
    name=None,
    description=None,
    prompt_templates=prompt_templates
)


GradioUI(agent).launch()