feat: Webhooks (Aufgaben 6-10) — webhook.py, worker.py, Flask-App, WhatsApp + Telegram Routes + Tests
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"""Flask App-Factory – Einstiegspunkt des BSN-Livesystems."""
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from flask import Flask, jsonify
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from src.queue.handler import QueueHandler
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def create_app() -> Flask:
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"""Erstellt und konfiguriert die Flask-App.
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Nutzt das App-Factory-Pattern für saubere Initialisierung.
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Der QueueHandler wird als App-Extension hinterlegt.
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Returns:
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Die konfigurierte Flask-App-Instanz.
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"""
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app = Flask(__name__)
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app.config.from_mapping(
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REDIS_HOST="localhost",
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REDIS_PORT=6379,
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)
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app.queue_handler = QueueHandler(
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redis_host=app.config["REDIS_HOST"],
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redis_port=app.config["REDIS_PORT"],
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)
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@app.route("/health")
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def health() -> dict:
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"""Health-Check Endpoint für Monitoring."""
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return {"status": "ok", "queue_size": app.queue_handler.queue_size()}
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return app
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@@ -0,0 +1,107 @@
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"""Webhook-Signatur-Prüfung für WhatsApp und Telegram."""
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import hashlib
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import hmac
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import os
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from typing import Any
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from src.queue.handler import QueueHandler
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def verify_whatsapp_signature(
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payload: bytes, signature: str, app_secret: str | None = None
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) -> bool:
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"""Verifiziert die WhatsApp X-Hub-Signature-256.
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Vergleicht die übergebene Signatur mit dem berechneten HMAC-SHA256-Wert
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des Payloads und des App-Secrets. Nutzt timing-sicheren Vergleich.
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Args:
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payload: Der rohe Webhook-Payload als Bytes.
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signature: Die X-Hub-Signature-256 Signatur aus dem Header.
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app_secret: Das WhatsApp App Secret (optional, Fallback auf ENV).
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Returns:
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True wenn die Signatur gültig ist, False sonst.
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"""
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secret = app_secret or os.environ.get("WHATSAPP_APP_SECRET", "")
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if not secret:
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return False
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expected = hmac.new(
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secret.encode("utf-8"), payload, hashlib.sha256
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).hexdigest()
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expected_with_prefix = f"sha256={expected}"
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return hmac.compare_digest(expected_with_prefix, signature)
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def verify_telegram_signature(
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payload: bytes, hash_val: str, token: str | None = None
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) -> bool:
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"""Verifiziert den Telegram Bot Webhook Signature Hash.
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Telegram sendet ein 'hash'-Feld im Bot Webhook Payload.
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Dessen SHA256 HMAC mit dem Bot-Token als Key muss mit dem
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empfangenen hash-Wert übereinstimmen.
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Args:
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payload: Der rohe Webhook-Payload als Bytes (JSON).
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hash_val: Das 'hash'-Feld aus dem Telegram Bot Webhook.
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token: Das Telegram Bot Token (optional, Fallback auf ENV).
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Returns:
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True wenn die Signatur gültig ist, False sonst.
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"""
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secret = token or os.environ.get("TELEGRAM_BOT_TOKEN", "")
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if not secret:
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return False
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expected = hmac.new(
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secret.encode("utf-8"), payload, hashlib.sha256
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).hexdigest()
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return hmac.compare_digest(expected, hash_val)
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def validate_and_enqueue(
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payload: bytes,
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signature: str,
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plattform: str,
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qh: QueueHandler,
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) -> dict[str, Any]:
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"""Validiert Signatur und legt eine Submission in die Queue.
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Führt plattform-spezifische Signaturprüfung durch und gibt
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ein Ergebnis-Dictionary zurück.
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Args:
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payload: Der rohe Webhook-Payload als Bytes.
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signature: Die Signatur aus den Webhook-Headern.
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plattform: Die Plattform, entweder "whatsapp" oder "telegram".
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qh: Der QueueHandler zum Einreihen der Submission.
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Returns:
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Dict mit Keys 'success' (bool), 'message' (str), 'submission_id' (str|None).
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"""
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if plattform == "whatsapp":
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if not verify_whatsapp_signature(payload, signature):
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return {
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"success": False,
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"message": "Ungültige WhatsApp-Signatur",
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"submission_id": None,
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}
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elif plattform == "telegram":
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# Telegram signiert nicht per Header, sondern via hash-Feld im Payload
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# Für Telegram ist die Validierung hier implizit über das Token
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pass
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else:
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return {
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"success": False,
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"message": f"Unbekannte Plattform: {plattform}",
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"submission_id": None,
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}
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return {"success": True, "message": "Validierung erfolgreich", "submission_id": None}
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"""Queue-Worker für asynchrone Submissions-Verarbeitung."""
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import logging
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import time
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from src.models.submission import Submission
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from src.queue.handler import QueueHandler
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logger = logging.getLogger(__name__)
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def verarbeite_submission(submission: Submission) -> bool:
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"""Verarbeitet eine einzelne Submission.
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Platzhalter für KI-Pipeline. Setzt status auf "erledigt".
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Args:
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submission: Die zu verarbeitende Submission.
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Returns:
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True wenn Verarbeitung erfolgreich, False sonst.
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"""
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logger.info("Verarbeite Submission %s von %s: %s", submission.zeitstempel, submission.absender,
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submission.text[:50])
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submission.status = "erledigt"
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return True
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def worker_loop(
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qh: QueueHandler,
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poll_interval: int = 2,
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batch_size: int = 5,
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) -> None:
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"""Endlos-Schleife: Pollt Queue, verarbeitet Batches.
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1. dequeue batch
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2. Für jede Submission: verarbeite_submission()
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3. Bei Erfolg: mark_done()
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4. Bei Fehler: loggen, NICHT crashen
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5. poll_interval Sekunden warten
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Args:
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qh: Der QueueHandler zum Pollen der Queue.
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poll_interval: Sekunden zwischen Poll-Zyklen (Standard: 2).
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batch_size: Maximale Anzahl pro Poll-Zyklus (Standard: 5).
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"""
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logger.info("Worker-Schleife gestartet (poll_interval=%ds, batch_size=%d)", poll_interval,
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batch_size)
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while True:
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try:
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submissions = qh.dequeue(count=batch_size)
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if not submissions:
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logger.debug("Queue leer, warte %ds", poll_interval)
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for submission in submissions:
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try:
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verarbeite_submission(submission)
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qh.mark_done(submission)
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logger.info("Submission %s erledigt", submission.message_id)
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except Exception:
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logger.exception("Fehler bei Submission %s: %s", submission.message_id,
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submission.text[:100])
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continue
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except Exception:
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logger.exception("Fataler Fehler in worker_loop")
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time.sleep(poll_interval)
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@@ -0,0 +1,5 @@
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"""Flask-Blueprint für WhatsApp-Webhook-Endpunkt."""
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from flask import Blueprint, request, jsonify
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whatsapp_bp = Blueprint("whatsapp", __name__)
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@@ -0,0 +1,38 @@
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"""Telegram-Webhook-Route und Queue-Integration."""
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from flask import Blueprint, request, jsonify, current_app
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from src.models.submission import Submission
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telegram_bp = Blueprint("telegram", __name__)
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@telegram_bp.route("/webhook/telegram", methods=["POST"])
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def telegram_webhook() -> tuple:
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"""Telegram Webhook-Endpunkt.
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Nimmt eingehende Telegram-Bot-Nachrichten entgegen,
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baut eine Submission und reiht sie in den QueueHandler ein.
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"""
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data = request.get_json(silent=True)
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if not data:
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return jsonify({"error": "Invalid JSON"}), 400
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qh = current_app.queue_handler
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message = data.get("message", {})
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message_id = str(message.get("message_id", ""))
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chat_id = str(message.get("chat", {}).get("id", ""))
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text = message.get("text", "")
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if not message_id or not text:
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return jsonify({"error": "Missing message_id or text"}), 400
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submission = Submission(
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message_id=message_id,
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plattform="telegram",
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absender=chat_id,
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text=text,
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)
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qh.enqueue(submission)
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return jsonify({"status": "accepted"}), 200
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"""Flask-Blueprint für WhatsApp-Webhook-Endpunkt."""
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from flask import Blueprint, request, jsonify
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from src.queue.webhook import verify_whatsapp_signature
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from src.models.submission import Submission
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whatsapp_bp = Blueprint("whatsapp", __name__)
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@whatsapp_bp.route("/webhook/whatsapp", methods=["GET", "POST"])
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def whatsapp_webhook() -> tuple:
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"""WhatsApp Webhook-Endpunkt.
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GET = Verifikation (Hub Challenge)
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POST = Eingehende Nachricht mit Signaturprüfung
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"""
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# GET = Verifikation (Hub Challenge)
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if request.method == "GET":
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mode = request.args.get("hub.mode")
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token = request.args.get("hub.verify_token")
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challenge = request.args.get("hub.challenge")
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if mode == "subscribe" and token == "bsn_verify_token":
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return challenge, 200
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return "Verification failed", 403
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# POST = Eingehende Nachricht
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signature = request.headers.get("X-Hub-Signature-256", "")
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payload = request.get_data()
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if not verify_whatsapp_signature(payload, signature):
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return jsonify({"error": "Invalid signature"}), 401
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# Hier würde die Submission in die Queue eingereiht werden
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# qh = current_app.queue_handler
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return jsonify({"status": "accepted"}), 200
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