How can I save PDF files locally using a Telegram bot with aiogram?

Other Questions Telegram bot
1

I’ve built a Telegram bot for text analysis using aiogram. Now I want to add a feature to handle PDF files when users click ‘Document Analysis’. I’m stuck on how to implement this feature because online searches and other AI tools haven’t provided clear guidance.

Here’s a snippet of my current code:

from aiogram import Bot, Dispatcher, types
from aiogram.filters import Command

bot = Bot(token='your_token_here')
dp = Dispatcher()

@dp.message(Command('begin'))
async def start_command(message: types.Message):
    buttons = [
        [
            types.KeyboardButton(text='Analyze Text'),
            types.KeyboardButton(text='Analyze Document')
        ],
    ]
    keyboard = types.ReplyKeyboardMarkup(
        keyboard=buttons,
        resize_keyboard=True,
        input_field_placeholder='Choose analysis type'
    )
    await message.answer('Welcome! What would you like to do?', reply_markup=keyboard)

user_states = {}

@dp.message(lambda msg: msg.text == 'Analyze Text')
async def text_analysis(message: types.Message):
    user_states[message.from_user.id] = 'awaiting_text'
    await message.answer('Please enter your text')

Can someone help me with code to save PDFs locally when users choose ‘Analyze Document’? Thanks!

2

hey sophia63, i’ve done this before! here’s a quick tip: use the ‘content_types’ parameter in ur message handler. then check if it’s a PDF (mime_type). use bot.get_file() to grab the file, then download it. don’t forget to make a folder for the PDFs! lemme know if u need more help

3

I’ve implemented a similar feature in my Telegram bot, so I can share some insights. To handle PDF files, you’ll need to use the file_id that Telegram provides when a document is sent. Here’s a basic approach:

  1. Create a handler for document messages.
  2. Check if the document is a PDF.
  3. Download the file using bot.get_file() and file.download().
  4. Save it locally with a unique name.

Here’s a rough code snippet to get you started:

@dp.message(content_types=['document'])
async def handle_docs(message: types.Message):
    if message.document.mime_type == 'application/pdf':
        file_id = message.document.file_id
        file = await bot.get_file(file_id)
        file_path = f'pdfs/{message.document.file_name}'
        await file.download(destination_file=file_path)
        await message.reply(f'PDF saved as {file_path}')
    else:
        await message.reply('Please send a PDF file.')

Remember to create a ‘pdfs’ directory and handle potential errors. You might also want to implement file size limits and cleanup old files periodically.

4

Based on my own experience with Telegram bots, you can modify your code by adding a dedicated handler for document messages. In this handler, verify that the received file is a PDF by checking its MIME type. Then, retrieve file details using bot.get_file() and download it to a local directory with an appropriate filename. Remember to handle potential errors and check for file size limits. Using modules like os can help manage file paths, and periodic cleanup of the storage directory may be beneficial.