202 lines
7.6 KiB
Python
202 lines
7.6 KiB
Python
#!/usr/bin/env python3
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"""Hocks Mieterportal – schlanke Mail-API (Muster: Schulportal).
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Nimmt Mails vom Portal entgegen (POST /send, Token-Pflicht) und leitet sie
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über den internen Postfix-Relay (mp-mail:25) aus. Versand läuft über eine
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Outbox mit Retry-Worker (Backoff bis 60 min, max. 10 Versuche) – fällt der
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Versand aus (Rate-Limit etc.), wird automatisch erneut versucht.
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Reine Standardbibliothek (python:3.12-alpine, keine pip-Abhängigkeiten).
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Endpunkte:
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GET /healthz → {"ok": true}
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GET /outbox → aktuelle Outbox (Demo/Debug)
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POST /send → {"ok": true, "id": ..., "versandt": true/false}
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Body: {"to": "...", "subject": "...", "text": "...", "html": "..."}
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Auth: Header X-Api-Token oder Body-Feld "token" == MAIL_API_TOKEN
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"""
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import json
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import os
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import re
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import smtplib
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import threading
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import time
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import uuid
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from email.message import EmailMessage
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from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
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# ── Konfiguration ─────────────────────────────────────────────
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RELAY_HOST = os.environ.get("RELAY_HOST", "mp-mail")
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RELAY_PORT = int(os.environ.get("RELAY_PORT", "25"))
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PORT = int(os.environ.get("PORT", "8080"))
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ALLOWED_ORIGIN = os.environ.get("ALLOWED_ORIGIN", "*")
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DATA_DIR = os.environ.get("DATA_DIR", "/data")
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SENDER_ADDRESS = os.environ.get("SENDER_ADDRESS", "noreply@hocks.eu")
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SENDER_NAME = os.environ.get("SENDER_NAME", "Hocks Mieterportal")
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MAIL_API_TOKEN = os.environ.get("MAIL_API_TOKEN", "")
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RATE_LIMIT = int(os.environ.get("RATE_LIMIT", "500")) # Mails pro Stunde
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MAX_VERSUCHE = 10
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BACKOFF_MAX_SEK = 3600
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os.makedirs(DATA_DIR, exist_ok=True)
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OUTBOX_DATEI = os.path.join(DATA_DIR, "outbox.json")
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EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")
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_lock = threading.Lock()
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_send_log: list[float] = [] # Timestamps für Rate-Limit
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# ── Outbox ────────────────────────────────────────────────────
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def outbox_laden() -> list[dict]:
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try:
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with open(OUTBOX_DATEI, encoding="utf-8") as f:
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return json.load(f)
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except (OSError, json.JSONDecodeError):
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return []
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def outbox_speichern(eintraege: list[dict]) -> None:
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tmp = OUTBOX_DATEI + ".tmp"
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with open(tmp, "w", encoding="utf-8") as f:
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json.dump(eintraege, f, ensure_ascii=False, indent=1)
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os.replace(tmp, OUTBOX_DATEI)
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def rate_limit_ok() -> bool:
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jetzt = time.time()
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global _send_log
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with _lock:
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_send_log = [t for t in _send_log if jetzt - t < 3600]
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if len(_send_log) >= RATE_LIMIT:
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return False
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_send_log.append(jetzt)
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return True
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def versenden(e: dict) -> bool:
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msg = EmailMessage()
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msg["From"] = f"{SENDER_NAME} <{SENDER_ADDRESS}>"
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msg["To"] = e["to"]
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msg["Subject"] = e["subject"]
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msg.set_content(e.get("text") or "")
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if e.get("html"):
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msg.add_alternative(e["html"], subtype="html")
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with smtplib.SMTP(RELAY_HOST, RELAY_PORT, timeout=20) as smtp:
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smtp.send_message(msg)
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return True
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def outbox_eintrag(e: dict) -> None:
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eintraege = outbox_laden()
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eintraege.append(e)
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outbox_speichern(eintraege)
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def worker() -> None:
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"""Retry-Worker: versucht offene Outbox-Einträge mit Backoff erneut."""
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while True:
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time.sleep(30)
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jetzt = time.time()
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geaendert = False
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eintraege = outbox_laden()
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for e in eintraege:
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if e.get("versandt") or e.get("versuche", 0) >= MAX_VERSUCHE:
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continue
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if jetzt - e.get("letzterVersuch", 0) < min(60 * 2 ** e.get("versuche", 0), BACKOFF_MAX_SEK):
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continue
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try:
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e["versuche"] = e.get("versuche", 0) + 1
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e["letzterVersuch"] = jetzt
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versenden(e)
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e["versandt"] = True
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e["versandtAm"] = time.strftime("%d.%m.%Y %H:%M:%S")
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except OSError:
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pass # nächster Versuch später
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geaendert = True
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if geaendert:
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outbox_speichern(eintraege)
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# ── HTTP ──────────────────────────────────────────────────────
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class Handler(BaseHTTPRequestHandler):
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server_version = "mp-mail-api/1.0"
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def _antwort(self, code: int, body: dict) -> None:
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daten = json.dumps(body, ensure_ascii=False).encode("utf-8")
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self.send_response(code)
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self.send_header("Content-Type", "application/json; charset=utf-8")
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self.send_header("Content-Length", str(len(daten)))
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if ALLOWED_ORIGIN != "*":
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self.send_header("Access-Control-Allow-Origin", ALLOWED_ORIGIN)
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self.end_headers()
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self.wfile.write(daten)
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def _body(self) -> dict:
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try:
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laenge = int(self.headers.get("Content-Length", "0"))
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return json.loads(self.rfile.read(laenge) or b"{}")
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except (ValueError, json.JSONDecodeError):
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return {}
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def do_OPTIONS(self) -> None: # noqa: N802
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self.send_response(204)
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self.send_header("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
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self.send_header("Access-Control-Allow-Headers", "Content-Type, X-Api-Token")
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self.end_headers()
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def do_GET(self) -> None: # noqa: N802
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if self.path.split("?")[0] == "/healthz":
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self._antwort(200, {"ok": True, "service": "mp-mail-api"})
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elif self.path.split("?")[0] == "/outbox":
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self._antwort(200, {"eintraege": outbox_laden()})
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else:
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self._antwort(404, {"fehler": "nicht gefunden"})
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def do_POST(self) -> None: # noqa: N802
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if self.path.split("?")[0] != "/send":
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self._antwort(404, {"fehler": "nicht gefunden"})
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return
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body = self._body()
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token = self.headers.get("X-Api-Token") or body.get("token") or ""
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if not MAIL_API_TOKEN or token != MAIL_API_TOKEN:
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self._antwort(401, {"fehler": "ungueltiger Token"})
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return
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an = str(body.get("to", "")).strip()
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betreff = str(body.get("subject", "")).strip()
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if not EMAIL_RE.match(an) or not betreff:
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self._antwort(400, {"fehler": "Empfaenger oder Betreff ungueltig"})
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return
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if not rate_limit_ok():
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self._antwort(429, {"fehler": "Rate-Limit erreicht"})
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return
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eintrag = {
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"id": uuid.uuid4().hex[:12],
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"to": an,
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"subject": betreff,
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"text": str(body.get("text", "")),
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"html": str(body.get("html", "")),
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"versuche": 0,
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"versandt": False,
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"angenommenAm": time.strftime("%d.%m.%Y %H:%M:%S"),
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}
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try:
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versenden(eintrag)
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eintrag["versandt"] = True
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eintrag["versandtAm"] = eintrag["angenommenAm"]
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eintrag["letzterVersuch"] = time.time()
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except OSError:
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outbox_eintrag(eintrag) # Worker versucht es spaeter erneut
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self._antwort(200, {"ok": True, "id": eintrag["id"], "versandt": eintrag["versandt"]})
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def log_message(self, fmt: str, *args) -> None:
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print(f"[{time.strftime('%H:%M:%S')}] {self.address_string()} {fmt % args}")
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if __name__ == "__main__":
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threading.Thread(target=worker, daemon=True).start()
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print(f"mp-mail-api lauscht auf :{PORT} (Relay {RELAY_HOST}:{RELAY_PORT}, Limit {RATE_LIMIT}/h)")
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ThreadingHTTPServer(("0.0.0.0", PORT), Handler).serve_forever()
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