app.py

import gradio as gr
from guardrail import is_safe  # Import the guardrail validation function
from langchain_huggingface import HuggingFaceEndpoint
from dotenv import load_dotenv
import os

# Load environment variables
load_dotenv()
HF_TOKEN = os.getenv("HF_TOKEN")

# Validate Hugging Face token
if not HF_TOKEN:
    raise ValueError("Missing Hugging Face API token. Please check your .env file.")

# Initialize the Hugging Face endpoint for generating responses
llm = HuggingFaceEndpoint(
    repo_id="mistralai/Mistral-7B-Instruct-v0.3",
    huggingfacehub_api_token=HF_TOKEN.strip(),
    temperature=0.7,
    max_new_tokens=100
)

# Chatbot response function with safety checks
def chatbot_response(user_message: str) -> str:
    """
    Generates a chatbot response while ensuring the content is safe for children under 16.
    """
    try:
        # Step 1: Validate the user input
        if not is_safe(user_message):
            return "Sorry, I cannot respond to that as it violates our safety policy."

        # Step 2: Generate a response using the Mistral model
        raw_response = llm.invoke(user_message)

        # Step 3: Validate the generated response
        if not is_safe(raw_response):
            return "Sorry, I cannot share that information as it violates our safety policy."

        # Step 4: Return the validated response
        return raw_response

    except Exception as e:
        return f"An error occurred: {str(e)}"

# Gradio Interface for the chatbot
with gr.Blocks() as app:
    gr.Markdown("## Kid-Safe Chatbot 🛡️")
    gr.Markdown("This chatbot ensures that all responses are appropriate for children under 16.")

    with gr.Row():
        user_input = gr.Textbox(label="Your Message", placeholder="Type your message here...")
    response_output = gr.Textbox(label="Chatbot Response", placeholder="The chatbot will respond here.")
    submit_button = gr.Button("Send")

    # On button click, generate response
    submit_button.click(
        fn=chatbot_response,
        inputs=[user_input],
        outputs=[response_output]
    )

# Launch the app
if __name__ == "__main__":
    app.launch()