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Add quart-based example (#1207)
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@ -213,6 +213,9 @@ lot of headaches to get threads and asyncio to work together. Instead,
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consider using `Quart <https://pgjones.gitlab.io/quart/>`_, an asyncio-based
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alternative to `Flask <flask.pocoo.org/>`_.
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Check out `quart_login.py`_ for an example web-application based on Quart.
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.. _logging: https://docs.python.org/3/library/logging.html
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.. _@SpamBot: https://t.me/SpamBot
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.. _issue 297: https://github.com/LonamiWebs/Telethon/issues/297
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.. _quart_login.py: https://github.com/LonamiWebs/Telethon/tree/master/telethon_examples#quart_loginpy
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@ -90,6 +90,30 @@ send messages, delete them, and download media. The code is a bit
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long which may make it harder to follow, and requires saving some
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state in order for downloads to work later.
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### [`quart_login.py`]
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* Usable as: **user**.
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* Difficulty: **medium**.
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Web-based application using [Quart](https://pgjones.gitlab.io/quart/index.html)
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(an `asyncio` alternative to [Flask](http://flask.pocoo.org/)) and Telethon
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together.
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The example should work as a base for Quart applications *with a single
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global client*, and it should be easy to adapt for multiple clients by
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following the comments in the code.
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It showcases how to login manually (ask for phone, code, and login),
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and once the user is logged in, some messages and photos will be shown
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in the page.
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There is nothing special about Quart. It was chosen because it's a
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drop-in replacement for Flask, the most popular option for web-apps.
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You can use any `asyncio` library with Telethon just as well,
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like [Sanic](https://sanic.readthedocs.io/en/latest/index.html) or
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[aiohttp](https://docs.aiohttp.org/en/stable/). You can even use Flask,
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if you learn how to use `threading` and `asyncio` together.
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### [`gui.py`]
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* Usable as: **user and bot**.
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@ -111,6 +135,7 @@ assumes some [`asyncio`] knowledge, but otherwise is easy to follow.
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[CC0 License]: https://github.com/LonamiWebs/Telethon/blob/master/telethon_examples/LICENSE
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[@BotFather]: https://t.me/BotFather
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[`assistant.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/assistant.py
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[`quart_login.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/quart_login.py
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[`gui.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/gui.py
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[`interactive_telegram_client.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/interactive_telegram_client.py
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[`print_messages.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/print_messages.py
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120
telethon_examples/quart_login.py
Normal file
120
telethon_examples/quart_login.py
Normal file
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@ -0,0 +1,120 @@
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import base64
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import os
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from quart import Quart, request
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from telethon import TelegramClient, utils
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def get_env(name, message):
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if name in os.environ:
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return os.environ[name]
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return input(message)
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# Session name, API ID and hash to use; loaded from environmental variables
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SESSION = os.environ.get('TG_SESSION', 'quart')
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API_ID = int(get_env('TG_API_ID', 'Enter your API ID: '))
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API_HASH = get_env('TG_API_HASH', 'Enter your API hash: ')
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# Helper method to add the HTML head/body
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def html(inner):
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return '''
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Telethon + Quart</title>
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</head>
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<body>{}</body>
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</html>
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'''.format(inner)
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# Helper method to format messages nicely
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async def format_message(message):
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if message.photo:
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content = '<img src="data:image/png;base64,{}" alt="{}" />'.format(
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base64.b64encode(await message.download_media(bytes)).decode(),
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message.raw_text
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)
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else:
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# client.parse_mode = 'html', so bold etc. will work!
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content = (message.text or '(action message)').replace('\n', '<br>')
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return '<p><strong>{}</strong>: {}<sub>{}</sub></p>'.format(
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utils.get_display_name(message.sender),
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content,
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message.date
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)
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# Define the global phone and Quart app variables
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phone = None
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app = Quart(__name__)
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# Quart handlers
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@app.route('/', methods=['GET', 'POST'])
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async def root():
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# Connect if we aren't yet
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if not client.is_connected():
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await client.connect()
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# We want to update the global phone variable to remember it
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global phone
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# Check form parameters (phone/code)
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form = await request.form
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if 'phone' in form:
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phone = form['phone']
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await client.send_code_request(phone)
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if 'code' in form:
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await client.sign_in(code=form['code'])
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# If we're logged in, show them some messages from their first dialog
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if await client.is_user_authorized():
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# They are logged in, show them some messages from their first dialog
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dialog = (await client.get_dialogs())[0]
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result = '<h1>{}</h1>'.format(dialog.title)
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async for m in client.iter_messages(dialog, 10):
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result += await(format_message(m))
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return html(result)
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# Ask for the phone if we don't know it yet
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if phone is None:
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return html('''
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<form action="/" method="post">
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Phone (international format): <input name="phone" type="text" placeholder="+34600000000">
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<input type="submit">
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</form>''')
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# We have the phone, but we're not logged in, so ask for the code
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return html('''
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<form action="/" method="post">
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Telegram code: <input name="code" type="text" placeholder="70707">
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<input type="submit">
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</form>''')
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# By default, `Quart.run` uses `asyncio.run()`, which creates a new asyncio
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# event loop. If we create the `TelegramClient` before, `telethon` will
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# use `asyncio.get_event_loop()`, which is the implicit loop in the main
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# thread. These two loops are different, and it won't work.
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#
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# So, we have to manually pass the same `loop` to both applications to
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# make 100% sure it works and to avoid headaches.
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#
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# Quart doesn't seem to offer a way to run inside `async def`
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# (see https://gitlab.com/pgjones/quart/issues/146) so we must
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# run and block on it last.
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#
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# This example creates a global client outside of Quart handlers.
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# If you create the client inside the handlers (common case), you
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# won't have to worry about any of this.
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client = TelegramClient(SESSION, API_ID, API_HASH)
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client.parse_mode = 'html' # <- render things nicely
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app.run(loop=client.loop) # <- same event loop as telethon
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