app.py

import os
import validators
import streamlit as st

st.set_page_config(page_title="LangChain: Summarize Text From YT or Website", page_icon="🦜")

from langchain.prompts import PromptTemplate
from langchain_groq import ChatGroq
from langchain.chains.summarize import load_summarize_chain
from langchain_community.document_loaders import YoutubeLoader, UnstructuredURLLoader

st.title("Last-Minute??? No Worries! Summarize Text From YT or Website :)")
st.subheader('Summarize URL')
default_api_key = os.getenv("default_api_key", "")

# Sidebar Inputs
with st.sidebar:
    # Option to input default API key
    default_api_key_option = st.checkbox("Use Owner's API Key", value=False)
    
    if default_api_key_option:
        groq_api_key = default_api_key
    else:
        groq_api_key = st.text_input("Groq API Key", value="", type="password", help="Enter your API key")

# Additional user input text
st.sidebar.text("You can also input your own API key above.")

generic_url = st.text_input("URL", label_visibility="collapsed")

prompt_template = """
Provide a summary of the following content in 300 words:
Content:{text}
"""
prompt = PromptTemplate(template=prompt_template, input_variables=["text"])

# Summarization
if st.button("Summarize the Content from YT or Website"):
    if not groq_api_key.strip() or not generic_url.strip():
        st.error("Please provide the information to get started")
    elif not validators.url(generic_url):
        st.error("Please enter a valid Url. It can be a YouTube video URL or website URL")
    else:
        try:
            llm = ChatGroq(model="Gemma-7b-It", groq_api_key=groq_api_key)
            with st.spinner("Fetching content..."):
                if "youtube.com" in generic_url:
                    # Fetch video content
                    loader = YoutubeLoader.from_youtube_url(generic_url, add_video_info=True)
                else:
                    # Fetch content from a regular website
                    loader = UnstructuredURLLoader(urls=[generic_url], ssl_verify=False,
                                                   headers={"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 13_5_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36"})
                
                docs = loader.load()  # Load content from the URL

                # Summarization chain setup
                chain = load_summarize_chain(llm, chain_type="stuff", prompt=prompt)
                output_summary = chain.run(docs)

                st.success(output_summary)  # Display summarized output
        except Exception as e:
            st.exception(f"Exception: {e}")