From 40d46cd6e5cdb3f34a675975d3863c2b650f90c3 Mon Sep 17 00:00:00 2001
From: Davide Alberani <da@erlug.linux.it>
Date: Thu, 18 Jul 2019 21:24:41 +0200
Subject: [PATCH] Telegram bot

---
 telegram-bot/Dockerfile            | 16 +++++++
 telegram-bot/telegram-onthisday.py | 73 ++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 telegram-bot/Dockerfile
 create mode 100755 telegram-bot/telegram-onthisday.py

diff --git a/telegram-bot/Dockerfile b/telegram-bot/Dockerfile
new file mode 100644
index 0000000..e893531
--- /dev/null
+++ b/telegram-bot/Dockerfile
@@ -0,0 +1,16 @@
+FROM alpine
+LABEL \
+	maintainer="Davide Alberani <da@erlug.linux.it>"
+
+RUN \
+	apk add --no-cache git python3 py3-cffi py3-six py3-requests py3-cryptography && \
+	pip3 install python-telegram-bot && \
+	pip3 install markovify && \
+	cd / && \
+	git clone https://github.com/alberanid/onthisday.git
+COPY telegram-onthisday.py /
+
+WORKDIR /
+
+ENTRYPOINT ["python3", "/telegram-onthisday.py"]
+
diff --git a/telegram-bot/telegram-onthisday.py b/telegram-bot/telegram-onthisday.py
new file mode 100755
index 0000000..9fe0583
--- /dev/null
+++ b/telegram-bot/telegram-onthisday.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+"""Telegram bot for onthisday.
+
+Build it with: docker build -t telegram-onthisday .
+Run it with something like: docker run -ti --rm -e EVENTS_TOKEN=your-telegram-token telegram-onthisday
+
+Copyright 2019 Davide Alberani <da@erlug.linux.it> Apache 2.0 license
+"""
+
+import os
+import sys
+import time
+import logging
+import subprocess
+from telegram.ext import Updater, CommandHandler
+
+logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+                    level=logging.INFO)
+
+logger = logging.getLogger(__name__)
+
+
+def getEvents(day=None):
+    cmd = ['python3', '/onthisday/onthisday.py']
+    if day:
+        try:
+            time.strptime(day, '%m/%d')
+            cmd += ['--date', day]
+        except Exception:
+            pass
+    if len(sys.argv) > 1:
+        cmd += sys.argv[1:]
+    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = process.communicate()
+    try:
+        stdout = stdout.strip()
+        stdout = stdout.decode('utf8')
+    except:
+        return 'uh-oh: something was wrong with the encoding of the events; try again'
+    if process.returncode != 0:
+        return 'something terrible is happening: exit code: %s, stderr: %s' % (
+                process.returncode, stderr.decode('utf8'))
+    if not stdout:
+        return 'sadness: the events list is empty; try again'
+    return stdout
+
+
+def events(bot, update, args=None):
+    day = None
+    if args and args[0]:
+        day = args[0].strip()
+    events = getEvents(day)
+    logging.info('%s wants some news; serving:\n%s' % (update.message.from_user.name, events))
+    update.message.reply_text(events)
+
+
+def about(bot, update):
+    logging.info('%s required more info' % update.message.from_user.name)
+    update.message.reply_text('See https://github.com/alberanid/onthisday\n\n/today to use the current date\n\n/date 07/30 for July 30')
+
+
+if __name__ == '__main__':
+    if 'EVENTS_TOKEN' not in os.environ:
+        print("Please specify the Telegram token in the EVENTS_TOKEN environment variable")
+    logging.info('start serving very important facts')
+    updater = Updater(os.environ['EVENTS_TOKEN'])
+    updater.dispatcher.add_handler(CommandHandler('today', events, pass_args=True))
+    updater.dispatcher.add_handler(CommandHandler('start', events, pass_args=True))
+    updater.dispatcher.add_handler(CommandHandler('date', events, pass_args=True))
+    updater.dispatcher.add_handler(CommandHandler('about', about))
+    updater.dispatcher.add_handler(CommandHandler('help', about))
+    updater.start_polling()
+    updater.idle()