Add base boilerplate

requirements.txt

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+Flask
+pydbus

signal_webhook/app.py

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+import typing as t
+from flask import Flask, request
+from . import signal
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def root() -> t.Tuple[str, int]:
+    return "Not supported.", 400
+
+
+@app.route("/alertmanager", methods=["POST"])
+def alertmanager():
+    data = request.get_json(cache=False)
+    if "version" not in data or int(data["version"]) != 4:
+        return "Bad API version", 400
+    if "alerts" not in data:
+        return "No alerts", 400
+    if "status" not in data:
+        return "No status", 400
+    if data["status"] != "firing":
+        # Ignore
+        return "OK", 200
+
+    for alert in data["alerts"]:
+        ...

signal_webhook/signal.py

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+import logging
+from pydbus import SystemBus
+from gi.repository.GLib import GError
+
+logger = logging.getLogger(__name__)
+
+
+def signal_send(recipient, message):
+    try:
+        bus = SystemBus()
+        signal_bus = bus.get("org.asamk.Signal")
+        signal_bus.sendMessage(
+            message,
+            [],
+            [recipient],
+        )
+    except GError as exn:
+        logger.error("Cannot send Signal notification: %s", exn)