feat(contract): add opt-in MAX configuration and lifecycle

Refs #81

.env.example

@@ -37,3 +37,13 @@ GITEA_URL=https://gitea.24studbank.ru
 GITEA_REPO=MedITron/PTSRaiAgent
 GITEA_USER=
 GITEA_TOKEN=
+# MAX notifications: keep disabled until the backend/channel PRs and a real bot are installed.
+MAX_ENABLED=false
+MAX_BOT_TOKEN=
+MAX_BOT_USERNAME=
+MAX_WEBHOOK_SECRET=
+MAX_WEBHOOK_URL=
+MAX_SITE_URL=
+# Optional path to a trusted PEM CA bundle; never disable TLS verification.
+MAX_CA_BUNDLE=
+MAX_LINK_TTL_SECONDS=600

app/config.py

@@ -1,10 +1,12 @@
 """Typed application settings. The only place that reads environment variables."""
 
+import re
 from functools import lru_cache
 from pathlib import Path
 from typing import Literal
+from urllib.parse import urlsplit
 
-from pydantic import Field
+from pydantic import Field, SecretStr, model_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 ROOT_DIR = Path(__file__).resolve().parent.parent
@@ -43,6 +45,36 @@ class Settings(BaseSettings):
     tg_bot_token: str = ""
     doctor_notify_chat_id: int | None = None
 
+    # MAX is opt-in. Its adapter is delivered in the related backend/channel changes.
+    max_enabled: bool = False
+    max_bot_token: SecretStr = SecretStr("")
+    max_bot_username: str = ""
+    max_webhook_secret: SecretStr = SecretStr("")
+    max_webhook_url: str = ""
+    max_site_url: str = ""
+    max_ca_bundle: Path | None = None
+    max_link_ttl_seconds: int = Field(default=600, ge=60, le=1800)
+
+    @model_validator(mode="after")
+    def validate_max(self) -> "Settings":
+        if not self.max_enabled:
+            return self
+        if not self.max_bot_token.get_secret_value().strip():
+            raise ValueError("MAX_BOT_TOKEN is required when MAX_ENABLED=true")
+        if not re.fullmatch(r"[A-Za-z0-9_]{1,128}", self.max_bot_username):
+            raise ValueError("MAX_BOT_USERNAME must be the bot nickname without @ or a URL")
+        if not re.fullmatch(r"[A-Za-z0-9_-]{32,256}", self.max_webhook_secret.get_secret_value()):
+            raise ValueError("MAX_WEBHOOK_SECRET must contain 32..256 URL-safe characters")
+        for name, value in (("MAX_SITE_URL", self.max_site_url), ("MAX_WEBHOOK_URL", self.max_webhook_url)):
+            url = urlsplit(value)
+            if url.scheme != "https" or not url.hostname or url.username or url.password or url.port not in (None, 443):
+                raise ValueError(f"{name} must use HTTPS on port 443 without credentials")
+            if url.query or (name == "MAX_WEBHOOK_URL" and url.fragment):
+                raise ValueError(f"{name} must not contain a query string (or a fragment for webhook)")
+        if self.max_ca_bundle is not None and not self.max_ca_bundle.is_file():
+            raise ValueError("MAX_CA_BUNDLE must point to an existing trusted CA bundle")
+        return self
+
     # Virtual clock for the demo (ADR-005).
     demo_clock: bool = True
     tz: str = "Europe/Moscow"

app/main.py

@@ -30,12 +30,24 @@ async def lifespan(_: FastAPI) -> AsyncGenerator[None, None]:
         # In compose Postgres is required and healthy before the app starts; this branch is for running the
         # API (and its tests) without a database. Endpoints touching the DB will fail until it is reachable.
         log.error("db init failed, continuing without db: %s", type(exc).__name__)
+        if settings.max_enabled:
+            raise  # MAX requires persistent bindings and a delivery queue.
     # Lanes fill these in (#13, #11); main.py itself stays frozen (#34).
-    await scheduler.start()
+    max_channel = None
+    try:
         await telegram.start()
+        if settings.max_enabled:
+            from app.channels import max_bot
+
+            max_channel = max_bot
+            await max_channel.start()
+        await scheduler.start()
         yield
-    await telegram.stop()
+    finally:
         await scheduler.stop()
+        if max_channel is not None:
+            await max_channel.stop()
+        await telegram.stop()
         await dispose()
 
 

tests/test_contracts_max.py

@@ -0,0 +1,47 @@
+"""MAX stays off without credentials; enabled deployments fail closed on incomplete settings."""
+
+import pytest
+from pydantic import ValidationError
+
+from app.config import Settings
+
+
+def configured(**overrides):
+    fields = {
+        "max_enabled": True,
+        "max_bot_token": "test-only-token",
+        "max_bot_username": "test_bot",
+        "max_webhook_secret": "test-only-secret-" * 3,
+        "max_webhook_url": "https://api.example.org/api/v1/webhooks/max",
+        "max_site_url": "https://patient.example.org/#/today",
+    }
+    return Settings(_env_file=None, **(fields | overrides))
+
+
+def test_max_disabled_by_default():
+    assert not Settings(_env_file=None).max_enabled
+
+
+def test_max_secrets_are_redacted():
+    settings = configured()
+    assert "test-only-token" not in repr(settings)
+    assert "test-only-secret" not in repr(settings)
+
+
+@pytest.mark.parametrize(
+    "overrides",
+    [
+        {"max_bot_token": ""},
+        {"max_bot_username": "@test_bot"},
+        {"max_webhook_secret": "short"},
+        {"max_site_url": "http://patient.example.org"},
+        {"max_webhook_url": "http://api.example.org"},
+        {"max_webhook_url": "https://api.example.org:8443/hook"},
+        {"max_webhook_url": "https://user:password@api.example.org/hook"},
+        {"max_webhook_url": "https://api.example.org/hook#fragment"},
+        {"max_site_url": "https://patient.example.org?token=credential"},
+    ],
+)
+def test_max_rejects_incomplete_or_unsafe_settings(overrides):
+    with pytest.raises(ValidationError):
+        configured(**overrides)