Create app.py

app.py

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+import logging
+from telegram import Update
+from telegram.ext import Updater, CommandHandler, MessageHandler, CallbackContext, Filters
+import PyPDF2  # Import the PyPDF2 library
+import io
+
+# Your provided BOT_TOKEN
+BOT_TOKEN = '6573536783:AAFxDVflga8vYXdqhJG-14zjhdmvOrtbQuQ'
+
+# Enable logging
+logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO)
+
+# Initialize the updater and dispatcher
+updater = Updater(token=BOT_TOKEN, use_context=True)
+dispatcher = updater.dispatcher
+
+# Define the start command handler
+def start(update: Update, context: CallbackContext):
+    update.message.reply_text("Welcome to the PDF Bot! Send me a PDF file, and I will send it back to you. "
+                              "You can also say hello, and I will respond with a greeting.")
+
+# Define a custom filter to check if a message contains a PDF file
+def is_pdf(update: Update) -> bool:
+    return update.message.document and update.message.document.file_name.endswith('.pdf')
+
+# Define a function to handle greetings and other user messages
+def handle_user_message(update: Update, context: CallbackContext):
+    user_message = update.message.text.lower()
+    if user_message == 'hello':
+        update.message.reply_text("Hello! How can I assist you today?")
+    elif 'thank you' in user_message:
+        update.message.reply_text("You're welcome!")
+    elif 'how are you' in user_message:
+        update.message.reply_text("I'm just a bot, but I'm here to help you!")
+    else:
+        update.message.reply_text("I can handle PDF files. Please send me a PDF file.")
+
+# Define the echo handler to handle PDF files
+def echo(update: Update, context: CallbackContext):
+    # Get the PDF file
+    file = context.bot.get_file(update.message.document.file_id)
+    # Send the same file back to the user
+    context.bot.send_document(chat_id=update.message.chat_id, document=file.file_id)
+    
+    # Get the PDF file's name
+    pdf_name = update.message.document.file_name
+    
+    # Download the PDF file as a bytearray
+    pdf_file = file.download_as_bytearray()
+    
+    # Use PyPDF2's PdfReader to calculate the number of pages
+    pdf_reader = PyPDF2.PdfReader(io.BytesIO(pdf_file))
+    num_pages = len(pdf_reader.pages)  # Use len to get the number of pages
+
+    # Send a message with PDF details
+    response_message = f"Here is the PDF file: {pdf_name}\nNumber of pages: {num_pages}"
+    context.bot.send_message(chat_id=update.message.chat_id, text=response_message)
+
+# Add the command handler and message handlers to the dispatcher
+dispatcher.add_handler(CommandHandler("start", start))
+dispatcher.add_handler(MessageHandler(Filters.text & ~Filters.command, handle_user_message))  # Handles greetings and more
+dispatcher.add_handler(MessageHandler(Filters.document & Filters.update, echo))  # Handles PDFs
+
+# Start the bot
+updater.start_polling()
+updater.idle()