From d640a21a5d8821f7d980bfc39384e79e84cde1a2 Mon Sep 17 00:00:00 2001
From: Davte <davte@libero.it>
Date: Mon, 15 Jul 2019 17:07:57 +0200
Subject: [PATCH] Webhook guide

---
 README.md                       |  34 ++++++++++
 davtelepot/__init__.py          |   2 +-
 examples/webhook_powered_bot.py | 106 ++++++++++++++++++++++++++++++++
 3 files changed, 141 insertions(+), 1 deletion(-)
 create mode 100644 examples/webhook_powered_bot.py

diff --git a/README.md b/README.md
index 4f0b6ef..045cca4 100644
--- a/README.md
+++ b/README.md
@@ -43,3 +43,37 @@ exit_state = Bot.run()
 sys.exit(exit_state)
 ```
 Check out `help(Bot)` for detailed information.
+
+## Webhook additional information
+To run a bot in webhook modality, you have to provide a `hostname` and `certificate` at bot instantiation and a `local_host` and `port` when calling `Bot.run` method.
+* Telegram will send POST requests at `https://{hostname}/webhook/{tokens}/` using `certificate` for encryption
+* `aiohttp.web.Application` server will listen `http://{local_host}:{port}` for updates
+
+It is therefore required a reverse proxy passing incoming requests to local_host.
+
+**Example of nginx reverse proxy serving this purpose**
+```nginx
+server {
+  listen 8553 ssl;
+  listen [::]:8553 ssl;
+
+  server_name example.com www.example.com;
+
+  location /telegram/ {
+     proxy_pass http://127.0.0.5:8552/;
+  }
+
+  ssl_certificate /path/to/fullchain.pem;
+  ssl_certificate_key /path/to/privkey.pem;
+}
+
+```
+
+**Example of python configuration file in this situation**
+```python
+# File config.py, gitignored and imported in main script
+hostname = "https://www.example.com:8553/telegram"
+certificate = "/path/to/fullchain.pem"
+local_host = "127.0.0.5"
+port = 8552
+```
diff --git a/davtelepot/__init__.py b/davtelepot/__init__.py
index 8669be3..4778882 100644
--- a/davtelepot/__init__.py
+++ b/davtelepot/__init__.py
@@ -7,7 +7,7 @@ __author__ = "Davide Testa"
 __email__ = "davide@davte.it"
 __credits__ = ["Marco Origlia", "Nick Lee @Nickoala"]
 __license__ = "GNU General Public License v3.0"
-__version__ = "2.0.4"
+__version__ = "2.0.5"
 __maintainer__ = "Davide Testa"
 __contact__ = "t.me/davte"
 
diff --git a/examples/webhook_powered_bot.py b/examples/webhook_powered_bot.py
new file mode 100644
index 0000000..1faf865
--- /dev/null
+++ b/examples/webhook_powered_bot.py
@@ -0,0 +1,106 @@
+"""Example showing how to use webhooks with davtelepot."""
+
+# Standard library modules
+import logging
+import os
+import sys
+
+# Third party modules
+try:
+    from davtelepot.bot import Bot
+except ImportError:
+    logging.error(
+        "Please install davtelepot library.\n"
+        "The use if a python virtual environment is advised.\n\n"
+        "```bash\n"
+        "pip -m venv env\n"
+        "env/bin/pip install davtelepot\n"
+        "env/bin/python davtelepot/examples/a_simple_bot.py"
+        "```"
+    )
+    sys.exit(1)
+
+# Project modules
+from a_simple_bot import initialize_bot
+
+# Get path of current script
+path = os.path.dirname(__file__)
+
+
+def _main():
+    # Import or prompt user for bot token
+    try:
+        from secrets import webhook_bot_token
+    except ImportError:
+        webhook_bot_token = input("Enter bot token:\t\t")
+        with open(
+            f'{path}/secrets.py',
+            'a'  # Append to file, create if it does not exist
+        ) as secrets_file:
+            secrets_file.write(f'webhook_bot_token = "{webhook_bot_token}"\n')
+    try:
+        from secrets import hostname
+    except ImportError:
+        hostname = input("Enter host name:\t\t")
+        with open(
+            f'{path}/secrets.py',
+            'a'  # Append to file, create if it does not exist
+        ) as secrets_file:
+            secrets_file.write(f'hostname = "{hostname}"\n')
+    try:
+        from secrets import certificate
+    except ImportError:
+        certificate = input("Enter ssl certificate:\t\t")
+        with open(
+            f'{path}/secrets.py',
+            'a'  # Append to file, create if it does not exist
+        ) as secrets_file:
+            secrets_file.write(f'certificate = "{certificate}"\n')
+    try:
+        from secrets import local_host
+    except ImportError:
+        local_host = input("Enter local host:\t\t")
+        with open(
+            f'{path}/secrets.py',
+            'a'  # Append to file, create if it does not exist
+        ) as secrets_file:
+            secrets_file.write(f'local_host = "{local_host}"\n')
+    try:
+        from secrets import port
+    except ImportError:
+        port = input("Enter local port:\t\t")
+        with open(
+            f'{path}/secrets.py',
+            'a'  # Append to file, create if it does not exist
+        ) as secrets_file:
+            secrets_file.write(f'port = "{port}"\n')
+
+    # Set logging preferences
+    log_formatter = logging.Formatter(
+        "%(asctime)s [%(module)-15s %(levelname)-8s]     %(message)s",
+        style='%'
+    )
+    root_logger = logging.getLogger()
+    root_logger.setLevel(logging.DEBUG)
+    consoleHandler = logging.StreamHandler()
+    consoleHandler.setFormatter(log_formatter)
+    consoleHandler.setLevel(logging.DEBUG)
+    root_logger.addHandler(consoleHandler)
+
+    # Instantiate, initialize and make `webhook_bot` run.
+    webhook_bot = Bot(
+        token=webhook_bot_token,
+        database_url=f"{path}/webhook_bot.db",
+        hostname=hostname,
+        certificate=certificate
+    )
+    initialize_bot(webhook_bot)
+    logging.info("Send a KeyboardInterrupt (ctrl+C) to stop bots.")
+    Bot.run(
+        local_host=local_host,
+        port=port
+    )
+
+
+if __name__ == '__main__':
+    _main()