Tidy examples and update licenses

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016 LonamiWebs
+Copyright (c) 2016-2019 LonamiWebs
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

telethon_examples/LICENSE

@@ -0,0 +1,116 @@
+CC0 1.0 Universal
+
+Statement of Purpose
+
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telethon_examples/README.md

@@ -0,0 +1,120 @@
+# Examples
+
+This folder contains several single-file examples using [Telethon].
+
+## Requisites
+
+You should have the `telethon` library installed with `pip`.
+Run `python3 -m pip install --upgrade telethon --user` if you don't
+have it installed yet (this is the most portable way to install it).
+
+Examples assume you have the following environment variables defined:
+
+* `TG_API_ID`, this is your API ID from https://my.telegram.org.
+* `TG_API_HASH`, this is your API hash from https://my.telegram.org.
+* `TG_TOKEN`, this is your bot token from [@BotFather] for bot examples.
+* `TG_SESSION`, this is the name of the `*.session` file to use.
+
+You can ignore any of these, and the scripts will prompt you to enter them.
+
+## Downloading Examples
+
+You may download all and run any example with by typing in a terminal:
+```sh
+git clone https://github.com/LonamiWebs/Telethon.git
+cd Telethon
+cd telethon_examples
+python3 gui.py
+```
+
+You can also right-click the title of any example and use "Save Link As…" to
+download only a particular example.
+
+All examples are licensed under the [CC0 License], so you can use
+them as the base for your own code without worrying about copyright.
+
+## Available Examples
+
+### [`print_updates.py`]
+
+* Usable as a: **user and bot**.
+* Difficulty: **easy**.
+
+Trivial example that just prints all the updates Telegram originally
+sends. Your terminal should support UTF-8, or Python may fail to print
+some characters on screen.
+
+### [`print_messages.py`]
+
+* Usable as a: **user and bot**.
+* Difficulty: **easy**.
+
+This example uses the different `@client.on` syntax to register event
+handlers, and uses the `pattern=` variable to filter only some messages.
+
+There are a lot other things you can do, but you should refer to the
+documentation of [`events.NewMessage`] since this is only a simple example.
+
+### [`replier.py`]
+
+* Usable as a: **user and bot**.
+* Difficulty: **easy**.
+
+This example showcases a third way to add event handlers (using decorators
+but without the client; you should use the one you prefer) and will also
+reply to some messages with different reactions, or to your commands.
+
+It also shows how to enable `logging`, which you should always do, but was
+not really needed for the previous two trivial examples.
+
+### [`assistant.py`]
+
+* Usable as a: **bot**.
+* Difficulty: **medium**.
+
+This example is the actual bot account [@TelethonianBot] running in the
+[official Telethon's chat] to help people out. The file is a bit big and
+assumes some [`asyncio`] knowledge, but otherwise is easy to follow.
+
+### [`interactive_telegram_client.py`]
+
+* Usable as a: **user and bot**.
+* Difficulty: **medium**.
+
+Interactive terminal client that you can use to list your dialogs,
+send messages, delete them, and download media. The code is a bit
+long which may make it harder to follow, and requires saving some
+state in order for downloads to work later.
+
+### [`gui.py`]
+
+* Usable as a: **user and bot**.
+* Difficulty: **high**.
+
+This is a simple GUI written with [`tkinter`] which becomes more complicated
+when there's a need to use [`asyncio`] (although it's only a bit of additional
+setup). The code to deal with the interface and the commands the GUI supports
+also complicate the code further and require knowledge and careful reading.
+
+This example is the actual bot account [@TelethonianBot] running in the
+[official Telethon's chat] to help people out. The file is a bit big and
+assumes some [`asyncio`] knowledge, but otherwise is easy to follow.
+
+![Screenshot of the tkinter GUI][tkinter GUI]
+
+
+[Telethon]: https://github.com/LonamiWebs/Telethon
+[CC0 License]: https://github.com/LonamiWebs/Telethon/blob/master/telethon_examples/LICENSE
+[@BotFather]: https://t.me/BotFather
+[`assistant.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/assistant.py
+[`gui.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/gui.py
+[`interactive_telegram_client.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/interactive_telegram_client.py
+[`print_messages.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/print_messages.py
+[`print_updates.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/print_updates.py
+[`replier.py`]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/replier.py
+[@TelethonianBot]: https://t.me/TelethonianBot
+[official Telethon's chat]: https://t.me/TelethonChat
+[`asyncio`]: https://docs.python.org/3/library/asyncio.html
+[`tkinter`]: https://docs.python.org/3/library/tkinter.html
+[tkinter GUI]: https://raw.githubusercontent.com/LonamiWebs/Telethon/master/telethon_examples/screenshot-gui.jpg
+[`events.NewMessage`]: https://telethon.readthedocs.io/en/stable/telethon.events.html#telethon.events.newmessage.NewMessage

telethon_examples/README.txt

@@ -1,15 +0,0 @@
-You should be able to run these files with python3 filename.py after
-installing Telethon (`pip3 install .` on the root of the project if you
-haven't installed it yet and you downloaded the repository).
-
-Most of these examples assume you have the following variables defined
-in your environment:
-
-    TG_API_ID, this is the api ID of your Telegram application.
-    TG_API_HASH, similarly, this is the api hash.
-    TG_TOKEN, for bot examples, this should be the bot token.
-    TG_SESSION, this is the session file name to be (re)used.
-
-See https://superuser.com/q/284342 to learn how to define them.
-It's more convenient to define them, but if you forget to do so,
-the scripts will ask you to enter the variables when ran.

telethon_examples/print_messages.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# A simple script to print some messages.
+import os
+import sys
+import time
+
+from telethon import TelegramClient, events, utils
+
+
+def get_env(name, message, cast=str):
+    if name in os.environ:
+        return os.environ[name]
+    while True:
+        value = input(message)
+        try:
+            return cast(value)
+        except ValueError as e:
+            print(e, file=sys.stderr)
+            time.sleep(1)
+
+
+session = os.environ.get('TG_SESSION', 'printer')
+api_id = get_env('TG_API_ID', 'Enter your API ID: ', int)
+api_hash = get_env('TG_API_HASH', 'Enter your API hash: ')
+proxy = None  # https://github.com/Anorov/PySocks
+
+# Create and start the client so we can make requests (we don't here)
+client = TelegramClient(session, api_id, api_hash, proxy=proxy).start()
+
+
+# `pattern` is a regex, see https://docs.python.org/3/library/re.html
+# Use https://regexone.com/ if you want a more interactive way of learning.
+#
+# "(?i)" makes it case-insensitive, and | separates "options".
+@client.on(events.NewMessage(pattern=r'(?i).*\b(hello|hi)\b'))
+async def handler(event):
+    sender = await event.get_sender()
+    name = utils.get_display_name(sender)
+    print(name, 'said', event.text, '!')
+
+try:
+    print('(Press Ctrl+C to stop this)')
+    client.run_until_disconnected()
+finally:
+    client.disconnect()
+
+# Note: We used try/finally to show it can be done this way, but using:
+#
+#   with client:
+#       client.run_until_disconnected()
+#
+# is almost always a better idea.

telethon_examples/print_updates.py

@@ -1,12 +1,16 @@
 #!/usr/bin/env python3
-# A simple script to print all updates received
+# A simple script to print all updates received.
+# Import modules to access environment, sleep, write to stderr
 import os
 import sys
 import time
 
+# Import the client
 from telethon import TelegramClient
 
 
+# This is a helper method to access environment variables or
+# prompt the user to type them in the terminal if missing.
 def get_env(name, message, cast=str):
     if name in os.environ:
         return os.environ[name]
@@ -19,28 +23,23 @@ def get_env(name, message, cast=str):
             time.sleep(1)
 
 
-client = TelegramClient(
-    os.environ.get('TG_SESSION', 'printer'),
-    get_env('TG_API_ID', 'Enter your API ID: ', int),
-    get_env('TG_API_HASH', 'Enter your API hash: '),
-    proxy=None
-)
+# Define some variables so the code reads easier
+session = os.environ.get('TG_SESSION', 'printer')
+api_id = get_env('TG_API_ID', 'Enter your API ID: ', int)
+api_hash = get_env('TG_API_HASH', 'Enter your API hash: ')
+proxy = None  # https://github.com/Anorov/PySocks
 
 
-async def update_handler(update):
+# This is our update handler. It is called when a new update arrives.
+async def handler(update):
     print(update)
 
 
-client.add_event_handler(update_handler)
+# Use the client in a `with` block. It calls `start/disconnect` automatically.
+with TelegramClient(session, api_id, api_hash, proxy=proxy) as client:
+    # Register the update handler so that it gets called
+    client.add_event_handler(handler)
 
-'''You could also have used the @client.on(...) syntax:
-from telethon import events
-
-@client.on(events.Raw)
-async def update_handler(update):
-    print(update)
-'''
-
-with client.start():
+    # Run the client until Ctrl+C is pressed, or the client disconnects
     print('(Press Ctrl+C to stop this)')
     client.run_until_disconnected()

telethon_examples/replier.py

@@ -6,26 +6,17 @@ This script assumes that you have certain files on the working directory,
 such as "xfiles.m4a" or "anytime.png" for some of the automated replies.
 """
 import os
-import re
 import sys
 import time
 from collections import defaultdict
-from datetime import datetime, timedelta
 
 from telethon import TelegramClient, events
 
-"""Uncomment this for debugging
 import logging
-logging.basicConfig(level=logging.DEBUG)
-logging.debug('dbg')
-logging.info('info')
-"""
+logging.basicConfig(level=logging.WARNING)
 
-REACTS = {'emacs': 'Needs more vim',
-          'chrome': 'Needs more Firefox'}
-
-# A list of dates of reactions we've sent, so we can keep track of floods
-recent_reacts = defaultdict(list)
+# "When did we last react?" dictionary, 0.0 by default
+recent_reacts = defaultdict(float)
 
 
 def get_env(name, message, cast=str):
@@ -40,6 +31,60 @@ def get_env(name, message, cast=str):
             time.sleep(1)
 
 
+def can_react(chat_id):
+    # Get the time when we last sent a reaction (or 0)
+    last = recent_reacts[chat_id]
+
+    # Get the current time
+    now = time.time()
+
+    # If 10 minutes as seconds have passed, we can react
+    if now - last < 10 * 60:
+        # Make sure we updated the last reaction time
+        recent_reacts[chat_id] = now
+        return True
+    else:
+        return False
+
+
+# Register `events.NewMessage` before defining the client.
+# Once you have a client, `add_event_handler` will use this event.
+@events.register(events.NewMessage)
+async def handler(event):
+    # There are better ways to do this, but this is simple.
+    # If the message is not outgoing (i.e. someone else sent it)
+    if not event.out:
+        if 'emacs' in event.raw_text:
+            if can_react(event.chat_id):
+                await event.reply('> emacs\nneeds more vim')
+
+        elif 'vim' in event.raw_text:
+            if can_react(event.chat_id):
+                await event.reply('> vim\nneeds more emacs')
+
+        elif 'chrome' in event.raw_text:
+            if can_react(event.chat_id):
+                await event.reply('> chrome\nneeds more firefox')
+
+    # Reply always responds as a reply. We can respond without replying too
+    if 'shrug' in event.raw_text:
+        if can_react(event.chat_id):
+            await event.respond(r'¯\_(ツ)_/¯')
+
+    # We can also use client methods from here
+    client = event.client
+
+    # If we sent the message, we are replying to someone,
+    # and we said "save pic" in the message
+    if event.out and event.reply_to_msg_id and 'save pic' in event.raw_text:
+        reply_msg = await event.get_reply_message()
+        replied_to_user = await reply_msg.get_input_sender()
+
+        message = await event.reply('Downloading your profile photo...')
+        file = await client.download_profile_photo(replied_to_user)
+        await message.edit('I saved your photo in {}'.format(file))
+
+
 client = TelegramClient(
     os.environ.get('TG_SESSION', 'replier'),
     get_env('TG_API_ID', 'Enter your API ID: ', int),
@@ -47,45 +92,9 @@ client = TelegramClient(
     proxy=None
 )
 
+with client:
+    # This remembers the events.NewMessage we registered before
+    client.add_event_handler(handler)
 
-@client.on(events.NewMessage)
-async def my_handler(event: events.NewMessage.Event):
-    global recent_reacts
-
-    # Through event.raw_text we access the text of messages without format
-    words = re.split('\W+', event.raw_text)
-
-    # Try to match some reaction
-    for trigger, response in REACTS.items():
-        if len(recent_reacts[event.chat_id]) > 3:
-            # Silently ignore triggers if we've recently sent 3 reactions
-            break
-
-        if trigger in words:
-            # Remove recent replies older than 10 minutes
-            recent_reacts[event.chat_id] = [
-                a for a in recent_reacts[event.chat_id] if
-                datetime.now() - a < timedelta(minutes=10)
-            ]
-            # Send a reaction as a reply (otherwise, event.respond())
-            await event.reply(response)
-            # Add this reaction to the list of recent actions
-            recent_reacts[event.chat_id].append(datetime.now())
-
-    # Automatically send relevant media when we say certain things
-    # When invoking requests, get_input_entity needs to be called manually
-    if event.out:
-        chat = await event.get_input_chat()
-        if event.raw_text.lower() == 'x files theme':
-            await client.send_file(chat, 'xfiles.m4a',
-                                   reply_to=event.message.id, voice_note=True)
-        if event.raw_text.lower() == 'anytime':
-            await client.send_file(chat, 'anytime.png',
-                                   reply_to=event.message.id)
-        if '.shrug' in event.text:
-            await event.edit(event.text.replace('.shrug', r'¯\_(ツ)_/¯'))
-
-
-with client.start():
     print('(Press Ctrl+C to stop this)')
     client.run_until_disconnected()