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"""WebsiteBench Harbor foreground entrypoint for the frozen clone."""

from __future__ import annotations

import json
import os
import re
import secrets
import smtplib
import urllib.error
import urllib.parse
import urllib.request
from email.message import EmailMessage
from pathlib import Path

import uvicorn


ROOT = Path(__file__).resolve().parent
SITE_ROOT = ROOT.parent
RUNTIME = json.loads((SITE_ROOT / "backend" / "runtime.json").read_text(encoding="utf-8"))
SITE_ID = str(RUNTIME["site"]["id"])
DATA_DIR = Path(os.environ["DATA_DIR"])
if not DATA_DIR.is_absolute():
    raise RuntimeError("DATA_DIR must be absolute")
DATA_DIR = DATA_DIR.resolve()
DATA_DIR.mkdir(parents=True, exist_ok=True)
os.environ["WEBSITEBENCH_DATA_DIR"] = str(DATA_DIR)
os.environ["WEBSITEBENCH_SITE_BACKEND_RUNTIME"] = str(SITE_ROOT / "backend" / "runtime.json")
os.environ["WEBSITEBENCH_SITE_BACKEND_DATABASE"] = str(DATA_DIR / RUNTIME["database"]["filename"])
if os.environ.get("WEBSITEBENCH_MAILBOX_BOOTSTRAP_URL", "").strip():
    os.environ["WEBSITEBENCH_DEPLOYMENT_PROFILE"] = "offline-harbor"
os.environ["WEBSITEBENCH_PAYMENT_PROFILE"] = "local-sandbox"


class _NoRedirect(urllib.request.HTTPRedirectHandler):
    def redirect_request(self, request, fp, code, msg, headers, newurl):
        del request, fp, code, msg, headers, newurl
        return None


def _harbor_mailbox_identity() -> dict[str, object] | None:
    bootstrap_url = os.environ.get("WEBSITEBENCH_MAILBOX_BOOTSTRAP_URL", "").strip()
    bootstrap_token = os.environ.get(
        "WEBSITEBENCH_MAILBOX_BOOTSTRAP_TOKEN", ""
    ).strip()
    if not bootstrap_url and not bootstrap_token:
        return None
    parsed = urllib.parse.urlsplit(bootstrap_url)
    if (
        parsed.scheme != "http"
        or parsed.hostname not in {
            "127.0.0.1",
            "::1",
            "localhost",
            "mailbox-internal",
        }
        or parsed.username is not None
        or parsed.password is not None
        or len(bootstrap_token) < 32
    ):
        raise RuntimeError("Harbor mailbox bootstrap configuration is invalid")
    request = urllib.request.Request(
        bootstrap_url,
        headers={
            "Accept": "application/json",
            "Authorization": f"Bearer {bootstrap_token}",
        },
        method="GET",
    )
    try:
        with urllib.request.build_opener(_NoRedirect).open(
            request, timeout=10
        ) as response:
            raw = response.read(64 * 1024 + 1)
    except (OSError, urllib.error.URLError) as exc:
        raise RuntimeError("Harbor mailbox bootstrap is unavailable") from exc
    if len(raw) > 64 * 1024:
        raise RuntimeError("Harbor mailbox bootstrap response is too large")
    try:
        identity = json.loads(raw.decode("utf-8"))
        namespace = str(identity["namespace"])
        capability = str(identity["capability"])
        smtp_host = str(identity["smtp_host"])
        smtp_port = int(identity["smtp_port"])
    except (KeyError, TypeError, ValueError, UnicodeError, json.JSONDecodeError) as exc:
        raise RuntimeError("Harbor mailbox bootstrap response is invalid") from exc
    if (
        re.fullmatch(r"[A-Za-z0-9][A-Za-z0-9._-]*", namespace) is None
        or len(namespace) > 128
        or len(capability) < 32
        or smtp_host not in {"127.0.0.1", "::1", "localhost", "mailbox-internal"}
        or not 1 <= smtp_port <= 65535
    ):
        raise RuntimeError("Harbor mailbox identity is invalid")
    return {
        "namespace": namespace,
        "capability": capability,
        "smtp_host": smtp_host,
        "smtp_port": smtp_port,
    }


MAILBOX_IDENTITY = _harbor_mailbox_identity()
MAIL_WORKER_TOKEN = secrets.token_hex(32) if MAILBOX_IDENTITY is not None else None
if MAIL_WORKER_TOKEN is not None:
    os.environ["ETSY_HARBOR_MAIL_WORKER_TOKEN"] = MAIL_WORKER_TOKEN

import app as clone_module  # noqa: E402

clone_app = clone_module.app


def _deliver_harbor_mail() -> None:
    """Compatibility hook; the auth store delivers synchronously to Mailpit."""

    return None

HEALTH_BODY = b'{"status":"ok"}'
# /healthz is the contract (ADR-0010); the private path stays mounted
# so bundles frozen before the migration keep answering.
HEALTH_PATHS = ("/healthz", "/__websitebench/health")


async def application(scope, receive, send):
    if scope.get("type") == "http" and scope.get("path") in HEALTH_PATHS:
        await send({
            "type": "http.response.start",
            "status": 200,
            "headers": [
                (b"content-type", b"application/json"),
                (b"content-length", str(len(HEALTH_BODY)).encode("ascii")),
                (b"cache-control", b"no-store"),
            ],
        })
        await send({"type": "http.response.body", "body": HEALTH_BODY})
        return

    async def deliver_before_final_body(message):
        if (
            message.get("type") == "http.response.body"
            and not message.get("more_body", False)
        ):
            _deliver_harbor_mail()
        await send(message)

    await clone_app(scope, receive, deliver_before_final_body)


if __name__ == "__main__":
    uvicorn.run(
        application,
        host=os.environ["HOST"],
        port=int(os.environ["PORT"]),
        access_log=False,
        timeout_graceful_shutdown=2,
    )