Migrate TickTick OAuth and action tasks

app/api/routes/auth.py

@@ -18,7 +18,7 @@ from app.services.auth import (
     revoke_session,
     validate_csrf_token,
 )
-from app.services.config_page import build_config_sections
+from app.services.config_page import build_config_sections, is_ticktick_oauth_ready
 
 logger = logging.getLogger(__name__)
 templates = Jinja2Templates(directory=str(Path(__file__).resolve().parents[2] / "templates"))
@@ -225,6 +225,9 @@ def _render_config_page(
             "config_error": None,
             "config_saved": False,
             "config_sections": build_config_sections(auth_db_session, settings),
+            "ticktick_oauth_ready": is_ticktick_oauth_ready(settings),
+            "ticktick_oauth_notice": None,
+            "ticktick_oauth_error": None,
         },
         status_code=status_code,
     )

app/api/routes/homeassistant.py

@@ -6,7 +6,8 @@ from fastapi.responses import PlainTextResponse, Response
 from pydantic import ValidationError
 from sqlalchemy.orm import Session
 
-from app.dependencies import get_db
+from app.dependencies import get_db, get_ticktick_client
+from app.integrations.ticktick import TickTickClient, TickTickConfigError, TickTickRequestError
 from app.schemas.homeassistant import HomeAssistantPublishEnvelope
 from app.services.homeassistant_inbound import (
     UnsupportedHomeAssistantMessage,
@@ -21,13 +22,15 @@ INTERNAL_SERVER_ERROR_MESSAGE = "internal server error"
 
 @router.post("/homeassistant/publish")
 async def publish_from_homeassistant(
-    request: Request, db: Session = Depends(get_db)
+    request: Request,
+    db: Session = Depends(get_db),
+    ticktick_client: TickTickClient = Depends(get_ticktick_client),
 ) -> Response:
     try:
         raw_payload = await request.body()
         data = json.loads(raw_payload)
         envelope = HomeAssistantPublishEnvelope.model_validate(data)
-        handle_homeassistant_message(db, envelope)
+        handle_homeassistant_message(db, envelope, ticktick_client)
     except json.JSONDecodeError as exc:
         logger.warning("Rejected Home Assistant publish request due to invalid JSON: %s", exc)
         return PlainTextResponse(BAD_REQUEST_MESSAGE, status_code=status.HTTP_400_BAD_REQUEST)
@@ -42,6 +45,12 @@ async def publish_from_homeassistant(
             INTERNAL_SERVER_ERROR_MESSAGE,
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
         )
+    except (TickTickConfigError, TickTickRequestError, RuntimeError) as exc:
+        logger.warning("Home Assistant publish request failed during TickTick handling: %s", exc)
+        return PlainTextResponse(
+            INTERNAL_SERVER_ERROR_MESSAGE,
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+        )
     except ValueError as exc:
         logger.warning("Rejected Home Assistant publish request due to invalid content: %s", exc)
         return PlainTextResponse(BAD_REQUEST_MESSAGE, status_code=status.HTTP_400_BAD_REQUEST)

app/api/routes/pages.py

@@ -8,7 +8,12 @@ from fastapi.templating import Jinja2Templates
 from app.config import Settings, get_settings
 from app.dependencies import get_app_settings, get_auth_db, get_current_auth_session
 from app.services.auth import AuthenticatedSession
-from app.services.config_page import ConfigSaveError, build_config_sections, save_config_updates
+from app.services.config_page import (
+    ConfigSaveError,
+    build_config_sections,
+    is_ticktick_oauth_ready,
+    save_config_updates,
+)
 from sqlalchemy.orm import Session
 
 templates = Jinja2Templates(directory=str(Path(__file__).resolve().parents[2] / "templates"))
@@ -16,6 +21,18 @@ router = APIRouter(tags=["pages"])
 logger = logging.getLogger(__name__)
 
 
+def _ticktick_oauth_notice(status_value: str | None) -> tuple[str | None, str | None]:
+    if status_value == "success":
+        return "TickTick authorization completed successfully.", None
+    if status_value == "invalid-state":
+        return None, "TickTick authorization failed due to invalid OAuth state. Start the flow again."
+    if status_value == "invalid-callback":
+        return None, "TickTick authorization callback was missing required parameters."
+    if status_value == "failed":
+        return None, "TickTick authorization failed. Check server logs for the provider response and verify TickTick app credentials and redirect URI."
+    return None, None
+
+
 @router.get("/", response_class=HTMLResponse)
 def home(
     request: Request,
@@ -46,6 +63,10 @@ def config_page(
     if current_auth is None:
         return RedirectResponse(url="/login", status_code=status.HTTP_303_SEE_OTHER)
 
+    ticktick_oauth_notice, ticktick_oauth_error = _ticktick_oauth_notice(
+        request.query_params.get("ticktick_oauth")
+    )
+
     context = {
         "app_name": settings.app_name,
         "app_env": settings.app_env,
@@ -56,6 +77,9 @@ def config_page(
         "config_error": None,
         "config_saved": request.query_params.get("saved") == "1",
         "config_sections": build_config_sections(auth_db_session, settings),
+        "ticktick_oauth_ready": is_ticktick_oauth_ready(settings),
+        "ticktick_oauth_notice": ticktick_oauth_notice,
+        "ticktick_oauth_error": ticktick_oauth_error,
     }
     return templates.TemplateResponse(request, "config.html", context)
 
@@ -84,6 +108,9 @@ async def config_submit(
             "config_error": "invalid config update request",
             "config_saved": False,
             "config_sections": build_config_sections(auth_db_session, settings),
+            "ticktick_oauth_ready": is_ticktick_oauth_ready(settings),
+            "ticktick_oauth_notice": None,
+            "ticktick_oauth_error": None,
         }
         return templates.TemplateResponse(
             request,
@@ -96,7 +123,7 @@ async def config_submit(
         save_config_updates(auth_db_session, dict(form), settings)
     except ConfigSaveError:
         logger.warning("Rejected config update due to invalid submitted values")
-        refreshed_settings = build_runtime_settings(auth_db_session, get_settings())
+        refreshed_settings = get_settings()
         context = {
             "app_name": refreshed_settings.app_name,
             "app_env": refreshed_settings.app_env,
@@ -107,6 +134,9 @@ async def config_submit(
             "config_error": "invalid config submission",
             "config_saved": False,
             "config_sections": build_config_sections(auth_db_session, refreshed_settings),
+            "ticktick_oauth_ready": is_ticktick_oauth_ready(refreshed_settings),
+            "ticktick_oauth_notice": None,
+            "ticktick_oauth_error": None,
         }
         return templates.TemplateResponse(
             request,

app/api/routes/ticktick.py

@@ -0,0 +1,79 @@
+import logging
+
+from fastapi import APIRouter, Depends, Request, status
+from fastapi.responses import PlainTextResponse, RedirectResponse, Response
+from sqlalchemy.orm import Session
+
+from app.config import Settings
+from app.dependencies import (
+    get_app_settings,
+    get_auth_db,
+    get_current_auth_session,
+    get_ticktick_client,
+)
+from app.integrations.ticktick import TickTickAuthError, TickTickClient, TickTickConfigError, TickTickRequestError
+from app.services.auth import AuthenticatedSession
+from app.services.config_page import save_config_value
+
+router = APIRouter(tags=["ticktick"])
+logger = logging.getLogger(__name__)
+
+
+@router.get("/ticktick/auth/start")
+def start_ticktick_auth(
+    current_auth: AuthenticatedSession | None = Depends(get_current_auth_session),
+    ticktick_client: TickTickClient = Depends(get_ticktick_client),
+) -> Response:
+    if current_auth is None:
+        return RedirectResponse(url="/login", status_code=status.HTTP_303_SEE_OTHER)
+
+    try:
+        authorization_url = ticktick_client.build_authorization_url()
+    except TickTickConfigError as exc:
+        logger.warning("Rejected TickTick OAuth start due to incomplete configuration: %s", exc)
+        return PlainTextResponse("TickTick integration is not configured", status_code=400)
+
+    return RedirectResponse(url=authorization_url, status_code=status.HTTP_303_SEE_OTHER)
+
+
+@router.get("/ticktick/auth/code")
+def handle_ticktick_auth_code(
+    request: Request,
+    auth_db_session: Session = Depends(get_auth_db),
+    settings: Settings = Depends(get_app_settings),
+    ticktick_client: TickTickClient = Depends(get_ticktick_client),
+) -> Response:
+    code = request.query_params.get("code", "")
+    state = request.query_params.get("state", "")
+
+    if not code or not state:
+        return RedirectResponse(
+            url="/config?ticktick_oauth=invalid-callback",
+            status_code=status.HTTP_303_SEE_OTHER,
+        )
+
+    try:
+        token = ticktick_client.exchange_authorization_code(code=code, state=state)
+        save_config_value(
+            auth_db_session,
+            env_name="TICKTICK_TOKEN",
+            value=token,
+            bootstrap_settings=settings,
+        )
+    except TickTickAuthError as exc:
+        logger.warning("Rejected TickTick OAuth callback due to invalid state: %s", exc)
+        return RedirectResponse(
+            url="/config?ticktick_oauth=invalid-state",
+            status_code=status.HTTP_303_SEE_OTHER,
+        )
+    except (TickTickConfigError, TickTickRequestError, ValueError) as exc:
+        logger.warning("TickTick OAuth callback failed: %s", exc)
+        return RedirectResponse(
+            url="/config?ticktick_oauth=failed",
+            status_code=status.HTTP_303_SEE_OTHER,
+        )
+
+    return RedirectResponse(
+        url="/config?ticktick_oauth=success",
+        status_code=status.HTTP_303_SEE_OTHER,
+    )

app/dependencies.py

@@ -7,6 +7,7 @@ from app.auth_db import get_auth_db_session
 from app.config import Settings, get_settings
 from app.db import get_db_session
 from app.integrations.homeassistant import HomeAssistantClient
+from app.integrations.ticktick import TickTickClient
 from app.poo_db import get_poo_db_session
 from app.services.auth import AuthenticatedSession, get_authenticated_session
 from app.services.config_page import build_runtime_settings
@@ -32,6 +33,10 @@ def get_homeassistant_client(settings: Settings = Depends(get_app_settings)) ->
     return HomeAssistantClient(settings)
 
 
+def get_ticktick_client(settings: Settings = Depends(get_app_settings)) -> TickTickClient:
+    return TickTickClient(settings)
+
+
 def get_current_auth_session(
     request: Request,
     session: Session = Depends(get_auth_db),

app/integrations/ticktick.py

@@ -1,12 +1,301 @@
-from dataclasses import dataclass
+from __future__ import annotations
+
+import json
+import logging
+import secrets
+import base64
+from dataclasses import asdict, dataclass, field, fields
+from typing import Any
+from urllib import error, parse, request
 
 from app.config import Settings
 
+logger = logging.getLogger(__name__)
+TICKTICK_AUTH_URL = "https://ticktick.com/oauth/authorize"
+TICKTICK_TOKEN_URL = "https://ticktick.com/oauth/token"
+TICKTICK_OPEN_API_BASE_URL = "https://api.ticktick.com/open/v1"
+TICKTICK_DATETIME_FORMAT = "%Y-%m-%dT%H:%M:%S%z"
+AUTH_SCOPE = "tasks:read tasks:write"
+
+
+class TickTickConfigError(RuntimeError):
+    """Raised when TickTick is missing required runtime configuration."""
+
+
+class TickTickAuthError(RuntimeError):
+    """Raised when TickTick OAuth state validation fails."""
+
+
+class TickTickRequestError(RuntimeError):
+    """Raised when a TickTick API request fails."""
+
+
+@dataclass(slots=True)
+class TickTickProject:
+    id: str
+    name: str
+    color: str | None = None
+    sortOrder: int | None = None
+    closed: bool | None = None
+    groupId: str | None = None
+    viewMode: str | None = None
+    permission: str | None = None
+    kind: str | None = None
+
+
+@dataclass(slots=True)
+class TickTickTask:
+    projectId: str
+    title: str
+    id: str | None = None
+    isAllDay: bool | None = None
+    completedTime: str | None = None
+    content: str | None = None
+    desc: str | None = None
+    dueDate: str | None = None
+    items: list[Any] | None = None
+    priority: int | None = None
+    reminders: list[str] | None = None
+    repeatFlag: str | None = None
+    sortOrder: int | None = None
+    startDate: str | None = None
+    status: int | None = None
+    timeZone: str | None = None
+
+
+@dataclass(slots=True)
+class TickTickAuthStateStore:
+    pending_state: str | None = None
+
+    def issue_state(self) -> str:
+        self.pending_state = secrets.token_hex(6)
+        return self.pending_state
+
+    def matches_state(self, state: str) -> bool:
+        return bool(self.pending_state and state == self.pending_state)
+
+    def consume_state(self, state: str) -> bool:
+        if not self.pending_state or state != self.pending_state:
+            return False
+        self.pending_state = None
+        return True
+
+    def clear(self) -> None:
+        self.pending_state = None
+
+
+default_auth_state_store = TickTickAuthStateStore()
+
+
+def _coerce_dataclass_payload(model_type: type, payload: dict[str, Any]) -> Any:
+    allowed_field_names = {item.name for item in fields(model_type)}
+    filtered_payload = {
+        key: value for key, value in payload.items() if key in allowed_field_names
+    }
+    return model_type(**filtered_payload)
+
 
 @dataclass(slots=True)
 class TickTickClient:
     settings: Settings
+    auth_state_store: TickTickAuthStateStore = field(default_factory=lambda: default_auth_state_store)
+    timeout_seconds: float = 10.0
 
     def is_configured(self) -> bool:
-        return bool(self.settings.ticktick_client_id and self.settings.ticktick_client_secret)
+        return bool(self._client_id() and self._client_secret())
+
+    def has_token(self) -> bool:
+        return bool(self.settings.ticktick_token)
+
+    def build_authorization_url(self) -> str:
+        self._require_auth_config()
+        state = self.auth_state_store.issue_state()
+        params = parse.urlencode(
+            {
+                "client_id": self._client_id(),
+                "response_type": "code",
+                "redirect_uri": self._redirect_uri(),
+                "state": state,
+                "scope": AUTH_SCOPE,
+            }
+        )
+        return f"{TICKTICK_AUTH_URL}?{params}"
+
+    def exchange_authorization_code(self, *, code: str, state: str) -> str:
+        self._require_auth_config()
+        if not code:
+            raise ValueError("code must not be empty")
+        if not state:
+            raise ValueError("state must not be empty")
+        if not self.auth_state_store.matches_state(state):
+            raise TickTickAuthError("Invalid state")
+
+        body = parse.urlencode(
+            {
+                "code": code,
+                "grant_type": "authorization_code",
+                "scope": AUTH_SCOPE,
+                "redirect_uri": self._redirect_uri(),
+            }
+        ).encode("utf-8")
+        req = request.Request(TICKTICK_TOKEN_URL, data=body, method="POST")
+        req.add_header("Content-Type", "application/x-www-form-urlencoded")
+        req.add_header("Authorization", self._basic_auth_header())
+        payload = self._send_json_request(req, operation="exchange_authorization_code")
+        self.auth_state_store.clear()
+        token = payload.get("access_token")
+        if not isinstance(token, str) or not token:
+            raise TickTickRequestError("TickTick token response did not include access_token")
+        return token
+
+    def get_projects(self) -> list[TickTickProject]:
+        self._require_token()
+        payload = self._authorized_json_request(
+            method="GET",
+            path="/project/",
+            operation="get_projects",
+        )
+        if not isinstance(payload, list):
+            raise TickTickRequestError("TickTick get_projects returned an unexpected payload")
+        return [_coerce_dataclass_payload(TickTickProject, project) for project in payload]
+
+    def get_tasks(self, project_id: str) -> list[TickTickTask]:
+        self._require_token()
+        if not project_id:
+            raise ValueError("project_id must not be empty")
+        payload = self._authorized_json_request(
+            method="GET",
+            path=f"/project/{parse.quote(project_id, safe='')}/data",
+            operation="get_tasks",
+            accepted_status_codes={200, 404},
+        )
+        if payload is None:
+            return []
+        if not isinstance(payload, dict):
+            raise TickTickRequestError("TickTick get_tasks returned an unexpected payload")
+        tasks = payload.get("tasks", [])
+        if not isinstance(tasks, list):
+            raise TickTickRequestError("TickTick get_tasks returned an invalid tasks payload")
+        return [_coerce_dataclass_payload(TickTickTask, task) for task in tasks]
+
+    def has_duplicate_task(self, *, project_id: str, task_title: str) -> bool:
+        if not task_title:
+            raise ValueError("task_title must not be empty")
+        return any(task.title == task_title for task in self.get_tasks(project_id))
+
+    def create_task(self, task: TickTickTask) -> None:
+        self._require_token()
+        if not task.projectId:
+            raise ValueError("task.projectId must not be empty")
+        if not task.title:
+            raise ValueError("task.title must not be empty")
+        if self.has_duplicate_task(project_id=task.projectId, task_title=task.title):
+            return
+
+        payload = {key: value for key, value in asdict(task).items() if value is not None}
+        self._authorized_json_request(
+            method="POST",
+            path="/task",
+            operation="create_task",
+            body=payload,
+            accepted_status_codes={200},
+        )
+
+    def _authorized_json_request(
+        self,
+        *,
+        method: str,
+        path: str,
+        operation: str,
+        body: Any | None = None,
+        accepted_status_codes: set[int] | None = None,
+    ) -> Any:
+        url = f"{TICKTICK_OPEN_API_BASE_URL}{path}"
+        encoded_body = None if body is None else json.dumps(body).encode("utf-8")
+        req = request.Request(url, data=encoded_body, method=method)
+        req.add_header("Authorization", f"Bearer {self.settings.ticktick_token}")
+        if body is not None:
+            req.add_header("Content-Type", "application/json")
+        return self._send_json_request(
+            req,
+            operation=operation,
+            accepted_status_codes=accepted_status_codes,
+        )
+
+    def _send_json_request(
+        self,
+        req: request.Request,
+        *,
+        operation: str,
+        accepted_status_codes: set[int] | None = None,
+    ) -> Any:
+        accepted_codes = accepted_status_codes or {200}
+        try:
+            with request.urlopen(req, timeout=self.timeout_seconds) as response:
+                status_code = response.getcode()
+                if status_code not in accepted_codes:
+                    raise TickTickRequestError(
+                        f"TickTick {operation} returned unexpected status {status_code}"
+                    )
+                raw_body = response.read()
+        except error.HTTPError as exc:
+            if exc.code in accepted_codes:
+                raw_body = exc.read()
+            else:
+                logger.warning(
+                    "TickTick %s failed with HTTP %s for %s",
+                    operation,
+                    exc.code,
+                    req.full_url,
+                )
+                raise TickTickRequestError(
+                    f"TickTick {operation} failed with HTTP {exc.code}"
+                ) from exc
+        except error.URLError as exc:
+            logger.warning("TickTick %s failed for %s: %s", operation, req.full_url, exc)
+            raise TickTickRequestError(
+                f"TickTick {operation} failed to reach TickTick API"
+            ) from exc
+
+        if not raw_body:
+            return None
+        try:
+            return json.loads(raw_body)
+        except json.JSONDecodeError as exc:
+            raise TickTickRequestError(
+                f"TickTick {operation} returned invalid JSON"
+            ) from exc
+
+    def _basic_auth_header(self) -> str:
+        raw_credentials = f"{self._client_id()}:{self._client_secret()}"
+        token = base64.b64encode(raw_credentials.encode("utf-8")).decode("ascii")
+        return f"Basic {token}"
+
+    def _client_id(self) -> str:
+        return self.settings.ticktick_client_id.strip()
+
+    def _client_secret(self) -> str:
+        return self.settings.ticktick_client_secret.strip()
+
+    def _redirect_uri(self) -> str:
+        return self.settings.ticktick_redirect_uri.strip()
+
+    def _require_auth_config(self) -> None:
+        if not self.is_configured():
+            raise TickTickConfigError(
+                "TickTick integration is not configured. Set TICKTICK_CLIENT_ID and "
+                "TICKTICK_CLIENT_SECRET."
+            )
+        if not self._redirect_uri():
+            raise TickTickConfigError(
+                "TickTick integration is missing TICKTICK_REDIRECT_URI."
+            )
+
+    def _require_token(self) -> None:
+        self._require_auth_config()
+        if self.has_token():
+            return
+        raise TickTickConfigError(
+            "TickTick integration is missing TICKTICK_TOKEN. Complete the OAuth flow first."
+        )
 

app/main.py

@@ -12,6 +12,7 @@ import app.auth_db as auth_db
 from app.api.routes.homeassistant import router as homeassistant_router
 from app.api.routes.location import router as location_router
 from app.api.routes.poo import router as poo_router
+from app.api.routes.ticktick import router as ticktick_router
 from app.config import get_settings
 from app.services.auth import AuthBootstrapError, initialize_auth_schema
 from app.services.config_page import seed_missing_config_from_bootstrap
@@ -95,6 +96,7 @@ def create_app() -> FastAPI:
     app.include_router(homeassistant_router)
     app.include_router(location_router)
     app.include_router(poo_router)
+    app.include_router(ticktick_router)
     return app
 
 

app/schemas/ticktick.py

@@ -0,0 +1,9 @@
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class TickTickActionTaskRequest(BaseModel):
+    title: str | None = None
+    action: str
+    due_hour: int = Field(alias="due_hour")
+
+    model_config = ConfigDict(extra="forbid", populate_by_name=True)

app/services/config_page.py

@@ -173,6 +173,29 @@ def save_config_updates(session: Session, form_data: dict[str, str], bootstrap_s
     reset_auth_db_caches()
 
 
+def save_config_value(
+    session: Session,
+    *,
+    env_name: str,
+    value: str,
+    bootstrap_settings: Settings,
+) -> None:
+    current_values = _read_config_values(session)
+    current_values[env_name] = value
+    _validate_config_values(current_values, bootstrap_settings)
+    _persist_config_values(session, current_values)
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+
+
+def is_ticktick_oauth_ready(settings: Settings) -> bool:
+    return bool(
+        settings.ticktick_client_id
+        and settings.ticktick_client_secret
+        and settings.ticktick_redirect_uri
+    )
+
+
 def _read_config_values(session: Session) -> dict[str, str]:
     rows = session.execute(select(AppConfigEntry).order_by(AppConfigEntry.key)).scalars().all()
     return {row.key: row.value for row in rows}

app/services/homeassistant_inbound.py

@@ -1,10 +1,13 @@
 from __future__ import annotations
 
 import json
+from datetime import UTC, datetime, time, timedelta
 from sqlalchemy.orm import Session
 
+from app.integrations.ticktick import TICKTICK_DATETIME_FORMAT, TickTickClient, TickTickTask
 from app.schemas.homeassistant import HomeAssistantPublishEnvelope
 from app.schemas.location import LocationRecordRequest
+from app.schemas.ticktick import TickTickActionTaskRequest
 from app.services.location import record_location
 
 
@@ -13,12 +16,18 @@ class UnsupportedHomeAssistantMessage(RuntimeError):
 
 
 def handle_homeassistant_message(
-    session: Session, envelope: HomeAssistantPublishEnvelope
+    session: Session,
+    envelope: HomeAssistantPublishEnvelope,
+    ticktick_client: TickTickClient | None = None,
 ) -> None:
     if envelope.target == "location_recorder":
         _handle_location_message(session, envelope)
         return
 
+    if envelope.target == "ticktick":
+        _handle_ticktick_message(envelope, ticktick_client)
+        return
+
     raise UnsupportedHomeAssistantMessage(
         f"Unsupported Home Assistant target/action: {envelope.target}/{envelope.action}"
     )
@@ -33,3 +42,38 @@ def _handle_location_message(session: Session, envelope: HomeAssistantPublishEnv
     content = json.loads(envelope.content.replace("'", '"'))
     payload = LocationRecordRequest.model_validate(content)
     record_location(session, payload)
+
+
+def _handle_ticktick_message(
+    envelope: HomeAssistantPublishEnvelope,
+    ticktick_client: TickTickClient | None,
+) -> None:
+    if envelope.action != "create_action_task":
+        raise UnsupportedHomeAssistantMessage(
+            f"Unsupported Home Assistant target/action: {envelope.target}/{envelope.action}"
+        )
+    if ticktick_client is None:
+        raise UnsupportedHomeAssistantMessage("TickTick client is unavailable")
+
+    content = json.loads(envelope.content.replace("'", '"'))
+    payload = TickTickActionTaskRequest.model_validate(content)
+    project_id = ticktick_client.settings.home_assistant_action_task_project_id
+    if not project_id:
+        raise RuntimeError(
+            "TickTick action task integration is missing HOME_ASSISTANT_ACTION_TASK_PROJECT_ID"
+        )
+
+    ticktick_client.create_task(
+        TickTickTask(
+            projectId=project_id,
+            title=payload.action,
+            dueDate=build_action_task_due_date(datetime.now().astimezone(), payload.due_hour),
+        )
+    )
+
+
+def build_action_task_due_date(now: datetime, due_hour: int) -> str:
+    local_now = now.astimezone()
+    due = local_now + timedelta(hours=due_hour)
+    next_midnight = datetime.combine(due.date(), time.min, tzinfo=local_now.tzinfo) + timedelta(days=1)
+    return next_midnight.astimezone(UTC).strftime(TICKTICK_DATETIME_FORMAT)

app/static/styles.css

@@ -182,6 +182,53 @@ button:hover {
   color: var(--muted);
 }
 
+.integration-action-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  padding-top: 8px;
+  border-top: 1px solid rgba(31, 41, 51, 0.08);
+}
+
+.integration-action-title {
+  margin: 0 0 6px;
+  font-weight: 600;
+  color: var(--text);
+}
+
+.integration-action-copy {
+  margin: 0;
+  color: var(--muted);
+  line-height: 1.5;
+}
+
+.button-link {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: fit-content;
+  min-width: 120px;
+  padding: 12px 18px;
+  border: none;
+  border-radius: 999px;
+  background: var(--accent);
+  color: white;
+  text-decoration: none;
+  cursor: pointer;
+}
+
+.button-link:hover {
+  filter: brightness(1.04);
+}
+
+.button-link.disabled {
+  background: rgba(91, 104, 117, 0.28);
+  color: rgba(31, 41, 51, 0.72);
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
 @media (max-width: 640px) {
   .shell {
     margin: 24px auto;
@@ -190,4 +237,9 @@ button:hover {
   .panel {
     padding: 24px;
   }
+
+  .integration-action-row {
+    align-items: stretch;
+    flex-direction: column;
+  }
 }

app/templates/config.html

@@ -25,6 +25,14 @@
   <div class="notice">config saved to .env. Some changes may require an app restart.</div>
   {% endif %}
 
+  {% if ticktick_oauth_error %}
+  <div class="alert">{{ ticktick_oauth_error }}</div>
+  {% endif %}
+
+  {% if ticktick_oauth_notice %}
+  <div class="notice">{{ ticktick_oauth_notice }}</div>
+  {% endif %}
+
   <div class="meta single-column">
     <div>
       <dt>当前用户</dt>
@@ -75,6 +83,24 @@
           {% endif %}
         </label>
         {% endfor %}
+
+        {% if section.name == "TickTick" %}
+        <div class="integration-action-row">
+          <div>
+            <p class="integration-action-title">TickTick OAuth</p>
+            {% if ticktick_oauth_ready %}
+            <p class="integration-action-copy">Use the saved TickTick client settings to start the authorization flow.</p>
+            {% else %}
+            <p class="integration-action-copy">Fill in TickTick Client ID, Client Secret, and Redirect URI before starting OAuth.</p>
+            {% endif %}
+          </div>
+          {% if ticktick_oauth_ready %}
+          <a class="button-link" href="/ticktick/auth/start">Authorize TickTick</a>
+          {% else %}
+          <span class="button-link disabled" aria-disabled="true">Authorize TickTick</span>
+          {% endif %}
+        </div>
+        {% endif %}
       </fieldset>
       {% endfor %}
 

docs/homeassistant-inbound.md

@@ -30,18 +30,27 @@
 
 ## 当前已支持的 Target / Action
 
-当前只接回最小可用路径：
+当前已接回的路径：
 
 - `location_recorder / record`
+- `ticktick / create_action_task`
 
-它会把 `content` 解析为 location recorder 请求，并直接走当前 Python 项目里的 location 写入逻辑。
+其中：
+
+- `location_recorder / record` 会把 `content` 解析为 location recorder 请求，并直接走当前 Python 项目里的 location 写入逻辑
+- `ticktick / create_action_task` 会沿用 legacy 行为，把 `content` 解析为：
+  - `action: string`
+  - `due_hour: int`
+  - 可选 `title` 字段会被忽略
+- TickTick task title 仍使用 `action`
+- due date 仍按 legacy 语义计算：先取 `now + due_hour`，再落到该日期的“次日零点”，最后转成 UTC 后写给 TickTick
+- 具体 project 仍由 `HOME_ASSISTANT_ACTION_TASK_PROJECT_ID` 提供
 
 ## 当前尚未接回
 
 以下 legacy 路径在当前阶段还没有迁入：
 
 - `poo_recorder / get_latest`
-- `ticktick / create_action_task`
 - 其他未定义 target/action
 
 这些请求当前会返回：

docs/ticktick.md

@@ -0,0 +1,42 @@
+# TickTick Integration
+
+当前 Python 项目里的 TickTick 迁移先恢复 legacy 的最核心能力，不额外扩成更大的集成层。
+
+## 当前已支持
+
+- 运行时从 config 表读取 TickTick 配置，缺失时仍可 fallback `.env`
+- `GET /ticktick/auth/start`
+  - 需要已登录 session
+  - 生成 OAuth `state`
+  - 直接重定向到 TickTick 授权页
+- `GET /ticktick/auth/code`
+  - 校验进程内保存的 `state`
+  - 用 authorization code 换取 access token
+  - 将 `TICKTICK_TOKEN` 持久化到 `app_config` 表
+- TickTick Open API 基础调用：
+  - 列 project
+  - 列 project 下 task
+  - 创建 task
+  - 按 title 精确匹配做重复创建保护
+- Home Assistant inbound 已重新接回 `ticktick / create_action_task`
+
+## 当前配置项
+
+- `TICKTICK_CLIENT_ID`
+- `TICKTICK_CLIENT_SECRET`
+- `TICKTICK_REDIRECT_URI`
+- `TICKTICK_TOKEN`
+- `HOME_ASSISTANT_ACTION_TASK_PROJECT_ID`
+
+## 兼容性说明
+
+- 仍保留 legacy 的 OAuth authorization code flow
+- `state` 仍是进程内临时状态；如果服务在 start 和 callback 之间重启，本轮实现下授权需要重新开始
+- 不再把 token 写回 `.env` 或其他配置文件，统一写入 config 表
+- 当前没有引入 legacy 的第三方 TickTick 库，先用标准库完成兼容行为
+
+## 后续适合单独拆分的工作
+
+- 给 config 页面增加明确的 TickTick 授权入口
+- 增加 project 探测或选择能力，减少手工填写 `HOME_ASSISTANT_ACTION_TASK_PROJECT_ID`
+- 如果后续发现 OAuth/token 生命周期需要更强健，再补 refresh token 或持久化 auth state

tests/test_auth.py

@@ -4,7 +4,9 @@ from pathlib import Path
 
 from fastapi.testclient import TestClient
 
+from app.auth_db import reset_auth_db_caches
 from app.config import get_settings
+from app.main import create_app
 
 
 def _extract_csrf_token(html: str) -> str:
@@ -56,6 +58,8 @@ def test_login_success_sets_session_cookie_and_allows_admin_access(client: TestC
     assert "New Password" in config_response.text
     assert "Save Config" in config_response.text
     assert "当前用户" in config_response.text
+    assert "Fill in TickTick Client ID, Client Secret, and Redirect URI before starting OAuth." in config_response.text
+    assert 'aria-disabled="true">Authorize TickTick<' in config_response.text
 
 
 def test_login_failure_returns_generic_error(client: TestClient) -> None:
@@ -187,3 +191,77 @@ def test_config_page_update_persists_to_database(
     assert rows["APP_NAME"] == "Updated Home Automation"
     assert rows["HOME_ASSISTANT_AUTH_TOKEN"] == "new-token"
     assert "AUTH_BOOTSTRAP_USERNAME" not in rows
+
+
+def test_config_page_shows_ticktick_oauth_link_when_ticktick_is_configured(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+
+    with TestClient(create_app()) as client:
+        login_page = client.get("/login")
+        csrf_token = _extract_csrf_token(login_page.text)
+
+        client.post(
+            "/login",
+            data={
+                "username": "admin",
+                "password": "test-password",
+                "csrf_token": csrf_token,
+            },
+            follow_redirects=False,
+        )
+
+        config_response = client.get("/config")
+
+    assert config_response.status_code == 200
+    assert "Use the saved TickTick client settings to start the authorization flow." in config_response.text
+    assert 'href="/ticktick/auth/start">Authorize TickTick<' in config_response.text
+
+
+def test_config_page_shows_ticktick_oauth_success_notice(client: TestClient) -> None:
+    login_page = client.get("/login")
+    csrf_token = _extract_csrf_token(login_page.text)
+
+    client.post(
+        "/login",
+        data={
+            "username": "admin",
+            "password": "test-password",
+            "csrf_token": csrf_token,
+        },
+        follow_redirects=False,
+    )
+
+    response = client.get("/config?ticktick_oauth=success")
+
+    assert response.status_code == 200
+    assert "TickTick authorization completed successfully." in response.text
+
+
+def test_config_page_shows_ticktick_oauth_failure_notice(client: TestClient) -> None:
+    login_page = client.get("/login")
+    csrf_token = _extract_csrf_token(login_page.text)
+
+    client.post(
+        "/login",
+        data={
+            "username": "admin",
+            "password": "test-password",
+            "csrf_token": csrf_token,
+        },
+        follow_redirects=False,
+    )
+
+    response = client.get("/config?ticktick_oauth=failed")
+
+    assert response.status_code == 200
+    assert "TickTick authorization failed. Check server logs for the provider response and verify TickTick app credentials and redirect URI." in response.text

tests/test_homeassistant_inbound.py

@@ -109,7 +109,23 @@ def test_homeassistant_publish_rejects_missing_content(location_client) -> None:
     assert "content" not in response.text
 
 
-def test_homeassistant_publish_returns_not_implemented_for_unknown_target(location_client) -> None:
+def test_homeassistant_publish_returns_internal_error_for_unconfigured_ticktick(location_client) -> None:
+    client, _ = location_client
+
+    response = client.post(
+        "/homeassistant/publish",
+        json={
+            "target": "ticktick",
+            "action": "create_action_task",
+            "content": "{'action': 'take out trash', 'due_hour': 6}",
+        },
+    )
+
+    assert response.status_code == 500
+    assert response.text == "internal server error"
+
+
+def test_homeassistant_publish_rejects_invalid_ticktick_content(location_client) -> None:
     client, _ = location_client
 
     response = client.post(
@@ -121,8 +137,8 @@ def test_homeassistant_publish_returns_not_implemented_for_unknown_target(locati
         },
     )
 
-    assert response.status_code == 500
-    assert response.text == "internal server error"
+    assert response.status_code == 400
+    assert response.text == "bad request"
 
 
 def test_homeassistant_publish_returns_not_implemented_for_unknown_location_action(

tests/test_ticktick.py

@@ -0,0 +1,383 @@
+import json
+import sqlite3
+from urllib import error
+from urllib.parse import parse_qs, urlparse
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.auth_db import reset_auth_db_caches
+from app.config import Settings, get_settings
+from app.integrations.ticktick import (
+    AUTH_SCOPE,
+    TICKTICK_AUTH_URL,
+    TickTickClient,
+    TickTickTask,
+    default_auth_state_store,
+)
+from app.main import create_app
+
+
+class _FakeJsonResponse:
+    def __init__(self, status_code: int, payload):
+        self.status_code = status_code
+        self.payload = payload
+
+    def getcode(self) -> int:
+        return self.status_code
+
+    def read(self) -> bytes:
+        return json.dumps(self.payload).encode("utf-8")
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc, tb) -> None:
+        return None
+
+
+def _configured_settings(**overrides) -> Settings:
+    payload = {
+        "ticktick_client_id": "ticktick-client-id",
+        "ticktick_client_secret": "ticktick-client-secret",
+        "ticktick_redirect_uri": "http://localhost:8000/ticktick/auth/code",
+        "ticktick_token": "ticktick-access-token",
+        "home_assistant_action_task_project_id": "project-123",
+    }
+    payload.update(overrides)
+    return Settings(_env_file=None, **payload)
+
+
+def _extract_csrf_token(html: str) -> str:
+    import re
+
+    match = re.search(r'name="csrf_token" value="([^"]+)"', html)
+    assert match is not None
+    return match.group(1)
+
+
+def test_build_authorization_url_contains_expected_query(monkeypatch: pytest.MonkeyPatch) -> None:
+    client = TickTickClient(settings=_configured_settings())
+    monkeypatch.setattr("app.integrations.ticktick.secrets.token_hex", lambda _: "state-123")
+
+    authorization_url = client.build_authorization_url()
+    parsed = urlparse(authorization_url)
+    query = parse_qs(parsed.query)
+
+    assert f"{parsed.scheme}://{parsed.netloc}{parsed.path}" == TICKTICK_AUTH_URL
+    assert query["client_id"] == ["ticktick-client-id"]
+    assert query["response_type"] == ["code"]
+    assert query["redirect_uri"] == ["http://localhost:8000/ticktick/auth/code"]
+    assert query["state"] == ["state-123"]
+    assert query["scope"] == [AUTH_SCOPE]
+
+
+def test_exchange_authorization_code_posts_expected_request(monkeypatch: pytest.MonkeyPatch) -> None:
+    captured = {}
+    client = TickTickClient(settings=_configured_settings())
+    default_auth_state_store.pending_state = "expected-state"
+
+    def fake_urlopen(req, timeout):
+        captured["url"] = req.full_url
+        captured["timeout"] = timeout
+        captured["authorization"] = req.headers["Authorization"]
+        captured["content_type"] = req.headers["Content-type"]
+        captured["body"] = req.data.decode("utf-8")
+        return _FakeJsonResponse(200, {"access_token": "new-token"})
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    token = client.exchange_authorization_code(code="oauth-code", state="expected-state")
+
+    assert token == "new-token"
+    assert captured["url"] == "https://ticktick.com/oauth/token"
+    assert captured["timeout"] == pytest.approx(10.0)
+    assert captured["content_type"] == "application/x-www-form-urlencoded"
+    assert captured["authorization"].startswith("Basic ")
+    assert "code=oauth-code" in captured["body"]
+    assert "grant_type=authorization_code" in captured["body"]
+    assert "scope=tasks%3Aread+tasks%3Awrite" in captured["body"]
+    assert "client_id=" not in captured["body"]
+    assert "client_secret=" not in captured["body"]
+
+
+def test_exchange_authorization_code_trims_ticktick_config_values(monkeypatch: pytest.MonkeyPatch) -> None:
+    captured = {}
+    client = TickTickClient(
+        settings=_configured_settings(
+            ticktick_client_id=" ticktick-client-id ",
+            ticktick_client_secret=" ticktick-client-secret ",
+            ticktick_redirect_uri=" http://localhost:8000/ticktick/auth/code ",
+        )
+    )
+    default_auth_state_store.pending_state = "trimmed-state"
+
+    def fake_urlopen(req, timeout):
+        captured["authorization"] = req.headers["Authorization"]
+        captured["body"] = req.data.decode("utf-8")
+        return _FakeJsonResponse(200, {"access_token": "trimmed-token"})
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    token = client.exchange_authorization_code(code="oauth-code", state="trimmed-state")
+
+    assert token == "trimmed-token"
+    assert captured["authorization"].startswith("Basic ")
+    assert "redirect_uri=http%3A%2F%2Flocalhost%3A8000%2Fticktick%2Fauth%2Fcode" in captured["body"]
+
+
+def test_create_task_skips_duplicate_titles(monkeypatch: pytest.MonkeyPatch) -> None:
+    client = TickTickClient(settings=_configured_settings())
+
+    def fake_urlopen(req, timeout):
+        assert req.full_url.endswith("/project/project-123/data")
+        return _FakeJsonResponse(
+            200,
+            {
+                "tasks": [
+                    {
+                        "id": "task-1",
+                        "projectId": "project-123",
+                        "title": "wash dishes",
+                        "columnId": "column-7",
+                    }
+                ]
+            },
+        )
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    client.create_task(TickTickTask(projectId="project-123", title="wash dishes"))
+
+
+def test_get_projects_ignores_unknown_fields(monkeypatch: pytest.MonkeyPatch) -> None:
+    client = TickTickClient(settings=_configured_settings())
+
+    def fake_urlopen(req, timeout):
+        assert req.full_url.endswith("/project/")
+        return _FakeJsonResponse(
+            200,
+            [
+                {
+                    "id": "project-123",
+                    "name": "Inbox",
+                    "etag": "project-etag",
+                }
+            ],
+        )
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    projects = client.get_projects()
+
+    assert len(projects) == 1
+    assert projects[0].id == "project-123"
+    assert projects[0].name == "Inbox"
+
+
+def test_create_task_posts_expected_payload(monkeypatch: pytest.MonkeyPatch) -> None:
+    captured = {"calls": []}
+    client = TickTickClient(settings=_configured_settings())
+
+    def fake_urlopen(req, timeout):
+        captured["calls"].append(req.full_url)
+        if req.full_url.endswith("/project/project-123/data"):
+            return _FakeJsonResponse(200, {"tasks": []})
+        captured["authorization"] = req.headers["Authorization"]
+        captured["content_type"] = req.headers["Content-type"]
+        captured["body"] = json.loads(req.data.decode("utf-8"))
+        return _FakeJsonResponse(200, {"id": "task-99"})
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    client.create_task(
+        TickTickTask(projectId="project-123", title="wash dishes", dueDate="2026-04-21T00:00:00+0000")
+    )
+
+    assert captured["calls"] == [
+        "https://api.ticktick.com/open/v1/project/project-123/data",
+        "https://api.ticktick.com/open/v1/task",
+    ]
+    assert captured["authorization"] == "Bearer ticktick-access-token"
+    assert captured["content_type"] == "application/json"
+    assert captured["body"] == {
+        "projectId": "project-123",
+        "title": "wash dishes",
+        "dueDate": "2026-04-21T00:00:00+0000",
+    }
+
+
+def test_homeassistant_publish_creates_ticktick_action_task(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    monkeypatch.setenv("TICKTICK_TOKEN", "ticktick-access-token")
+    monkeypatch.setenv("HOME_ASSISTANT_ACTION_TASK_PROJECT_ID", "project-123")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+
+    captured = {"calls": []}
+
+    def fake_urlopen(req, timeout):
+        captured["calls"].append(req.full_url)
+        if req.full_url.endswith("/project/project-123/data"):
+            return _FakeJsonResponse(200, {"tasks": []})
+        captured["body"] = json.loads(req.data.decode("utf-8"))
+        return _FakeJsonResponse(200, {"id": "task-1"})
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    with TestClient(create_app()) as client:
+        response = client.post(
+            "/homeassistant/publish",
+            json={
+                "target": "ticktick",
+                "action": "create_action_task",
+                "content": "{'title': 'ignored', 'action': 'take out trash', 'due_hour': 6}",
+            },
+        )
+
+    assert response.status_code == 200
+    assert captured["calls"] == [
+        "https://api.ticktick.com/open/v1/project/project-123/data",
+        "https://api.ticktick.com/open/v1/task",
+    ]
+    assert captured["body"]["projectId"] == "project-123"
+    assert captured["body"]["title"] == "take out trash"
+    assert captured["body"]["dueDate"].endswith("+0000")
+
+
+def test_ticktick_auth_start_redirects_authenticated_user(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+    monkeypatch.setattr("app.integrations.ticktick.secrets.token_hex", lambda _: "state-redirect")
+
+    with TestClient(create_app()) as client:
+        login_page = client.get("/login")
+        csrf_token = _extract_csrf_token(login_page.text)
+        client.post(
+            "/login",
+            data={
+                "username": "admin",
+                "password": "test-password",
+                "csrf_token": csrf_token,
+            },
+            follow_redirects=False,
+        )
+
+        response = client.get("/ticktick/auth/start", follow_redirects=False)
+
+    assert response.status_code == 303
+    parsed = urlparse(response.headers["location"])
+    query = parse_qs(parsed.query)
+    assert f"{parsed.scheme}://{parsed.netloc}{parsed.path}" == TICKTICK_AUTH_URL
+    assert query["state"] == ["state-redirect"]
+
+
+def test_ticktick_auth_callback_persists_token(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+    default_auth_state_store.pending_state = "callback-state"
+
+    def fake_urlopen(req, timeout):
+        return _FakeJsonResponse(200, {"access_token": "persisted-token"})
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    with TestClient(create_app()) as client:
+        response = client.get(
+            "/ticktick/auth/code?state=callback-state&code=oauth-code",
+            follow_redirects=False,
+        )
+
+    assert response.status_code == 303
+    assert response.headers["location"] == "/config?ticktick_oauth=success"
+
+    conn = sqlite3.connect(test_database_urls["app_path"])
+    try:
+        row = conn.execute(
+            "SELECT value FROM app_config WHERE key = ?",
+            ("TICKTICK_TOKEN",),
+        ).fetchone()
+    finally:
+        conn.close()
+
+    assert row is not None
+    assert row[0] == "persisted-token"
+
+
+def test_ticktick_auth_callback_redirects_on_invalid_state(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+    default_auth_state_store.pending_state = "expected-state"
+
+    with TestClient(create_app()) as client:
+        response = client.get(
+            "/ticktick/auth/code?state=wrong-state&code=oauth-code",
+            follow_redirects=False,
+        )
+
+    assert response.status_code == 303
+    assert response.headers["location"] == "/config?ticktick_oauth=invalid-state"
+
+
+def test_ticktick_auth_callback_redirects_when_token_exchange_fails(
+    test_database_urls,
+    ready_location_database,
+    ready_poo_database,
+    auth_database,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("TICKTICK_CLIENT_ID", "ticktick-client-id")
+    monkeypatch.setenv("TICKTICK_CLIENT_SECRET", "ticktick-client-secret")
+    monkeypatch.setenv("TICKTICK_REDIRECT_URI", "http://localhost:8000/ticktick/auth/code")
+    get_settings.cache_clear()
+    reset_auth_db_caches()
+    default_auth_state_store.pending_state = "callback-state"
+
+    def fake_urlopen(req, timeout):
+        raise error.HTTPError(req.full_url, 401, "Unauthorized", hdrs=None, fp=None)
+
+    monkeypatch.setattr("app.integrations.ticktick.request.urlopen", fake_urlopen)
+
+    with TestClient(create_app()) as client:
+        response = client.get(
+            "/ticktick/auth/code?state=callback-state&code=oauth-code",
+            follow_redirects=False,
+        )
+
+    assert response.status_code == 303
+    assert response.headers["location"] == "/config?ticktick_oauth=failed"