app.py

import streamlit as st
import smtplib
from email.message import EmailMessage
import http.client
import requests

# SMTP Example (Simplified)
def smtp_client(server, port, from_email, to_email, subject, message):
    msg = EmailMessage()
    msg.set_content(message)
    msg['Subject'] = subject
    msg['From'] = from_email
    msg['To'] = to_email

    try:
        with smtplib.SMTP(server, port) as smtp:
            smtp.send_message(msg)
        return "Email sent successfully!"
    except Exception as e:
        return f"Failed to send email: {e}"

# HTTP Example
def http_client(url):
    try:
        response = requests.get(url)
        return response.text[:500]  # Return the first 500 characters for brevity
    except Exception as e:
        return f"Failed to retrieve the URL: {e}"

# Streamlit UI
st.title("Internet Communication Protocols Demo 🌐")

# SMTP Section
st.header("SMTP Demo 📧")
smtp_server = st.text_input("SMTP Server", value="smtp.example.com")
smtp_port = st.text_input("SMTP Port", value="587")
from_email = st.text_input("From Email", value="from@example.com")
to_email = st.text_input("To Email", value="to@example.com")
subject = st.text_input("Subject", value="Test Email")
message = st.text_area("Message", value="This is a test email.")
if st.button("Send Email"):
    result = smtp_client(smtp_server, smtp_port, from_email, to_email, subject, message)
    st.success(result)

# HTTP Section
st.header("HTTP Demo 🌐")
url = st.text_input("URL to fetch", value="http://example.com")
if st.button("Fetch URL"):
    result = http_client(url)
    st.text_area("Response", value=result, height=250)