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Handles the one-time Oura OAuth2 flow and\n// stores the refresh token in Val Town blob storage so it survives restarts.\n//\n// SET THESE ENV VARS in the val's Settings:\n// OURA_CLIENT_ID — from cloud.ouraring.com OAuth app\n// OURA_CLIENT_SECRET — from cloud.ouraring.com OAuth app\n// MCP_SECRET — a long random string you invent (guards your endpoint)\n//\n// Oura OAuth app redirect URI must be: https://.val.run/callback\n//\n// Endpoints:\n// GET / status page\n// GET /auth start Oura OAuth (visit once)\n// GET /callback Oura redirects here; stores tokens\n// POST /mcp/ the MCP endpoint Claude connects to\n// ──────────────────────────────────────────────────────────────────────────\n\nimport { blob } from \"https://esm.town/v/std/blob\";\n\nconst OURA_CLIENT_ID = Deno.env.get(\"OURA_CLIENT_ID\")!;\nconst OURA_CLIENT_SECRET = Deno.env.get(\"OURA_CLIENT_SECRET\")!;\nconst MCP_SECRET = Deno.env.get(\"MCP_SECRET\")!;\n\nconst OURA_AUTHORIZE = \"https://cloud.ouraring.com/oauth/authorize\";\nconst OURA_TOKEN = \"https://api.ouraring.com/oauth/token\";\nconst OURA_API = \"https://api.ouraring.com/v2/usercollection\";\nconst SCOPES = \"personal daily heartrate workout spo2 session tag\";\n\nconst TOKENS_KEY = \"oura_tokens\"; // { access_token, refresh_token, expires_at }\nconst STATE_KEY = \"oura_oauth_state\";\n\n// ── token helpers ──────────────────────────────────────────────────────────\nasync function getTokens(): Promise {\n try {\n return (await blob.getJSON(TOKENS_KEY)) ?? null;\n } catch {\n return null;\n }\n}\n\nasync function saveTokens(t: any) {\n await blob.setJSON(TOKENS_KEY, {\n access_token: t.access_token,\n refresh_token: t.refresh_token,\n // refresh ~1 min early\n expires_at: Date.now() + (t.expires_in ?? 86400) * 1000 - 60_000,\n });\n}\n\nasync function ensureAccessToken(): Promise {\n const tk = await getTokens();\n if (!tk) throw new Error(\"Not connected to Oura yet — visit /auth once.\");\n if (Date.now() < tk.expires_at) return tk.access_token;\n\n // refresh\n const body = new URLSearchParams({\n grant_type: \"refresh_token\",\n refresh_token: tk.refresh_token,\n client_id: OURA_CLIENT_ID,\n client_secret: OURA_CLIENT_SECRET,\n });\n const res = await fetch(OURA_TOKEN, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/x-www-form-urlencoded\" },\n body,\n });\n if (!res.ok) throw new Error(`Token refresh failed: ${res.status} ${await res.text()}`);\n const json = await res.json();\n // Oura may rotate the refresh token; keep the new one if present.\n if (!json.refresh_token) json.refresh_token = tk.refresh_token;\n await saveTokens(json);\n return json.access_token;\n}\n\nasync function ouraGet(path: string, params: Record = {}) {\n const token = await ensureAccessToken();\n const url = new URL(`${OURA_API}/${path}`);\n for (const [k, v] of Object.entries(params)) if (v) url.searchParams.set(k, v);\n const res = await fetch(url, { headers: { Authorization: `Bearer ${token}` } });\n if (!res.ok) throw new Error(`Oura ${path} -> ${res.status}: ${await res.text()}`);\n return res.json();\n}\n\n// ── MCP tool catalogue ───────────────────────────────────────────────────\nconst dateSchema = {\n type: \"object\",\n properties: {\n start_date: { type: \"string\", description: \"YYYY-MM-DD\" },\n end_date: { type: \"string\", description: \"YYYY-MM-DD\" },\n },\n};\n\nconst TOOLS = [\n { name: \"get_daily_sleep\", description: \"Daily sleep scores & contributors.\", inputSchema: dateSchema },\n { name: \"get_daily_readiness\", description: \"Daily readiness scores & recovery.\", inputSchema: dateSchema },\n { name: \"get_daily_activity\", description: \"Daily activity: steps, calories, score.\", inputSchema: dateSchema },\n { name: \"get_daily_stress\", description: \"Daily stress summary.\", inputSchema: dateSchema },\n { name: \"get_daily_spo2\", description: \"Daily blood oxygen (SpO2).\", inputSchema: dateSchema },\n { name: \"get_sleep\", description: \"Detailed sleep periods (stages, HRV, etc.).\", inputSchema: dateSchema },\n { name: \"get_workouts\", description: \"Logged workouts.\", inputSchema: dateSchema },\n { name: \"get_sessions\", description: \"Moment/meditation sessions.\", inputSchema: dateSchema },\n {\n name: \"get_heartrate\",\n description: \"Heart-rate time series.\",\n inputSchema: {\n type: \"object\",\n properties: {\n start_datetime: { type: \"string\", description: \"ISO 8601, e.g. 2026-06-13T00:00:00+07:00\" },\n end_datetime: { type: \"string\", description: \"ISO 8601\" },\n },\n },\n },\n { name: \"get_personal_info\", description: \"Account/personal info.\", inputSchema: { type: \"object\", properties: {} } },\n];\n\nconst DATE_ENDPOINTS: Record = {\n get_daily_sleep: \"daily_sleep\",\n get_daily_readiness: \"daily_readiness\",\n get_daily_activity: \"daily_activity\",\n get_daily_stress: \"daily_stress\",\n get_daily_spo2: \"daily_spo2\",\n get_sleep: \"sleep\",\n get_workouts: \"workout\",\n get_sessions: \"session\",\n};\n\nasync function callTool(name: string, args: any) {\n if (DATE_ENDPOINTS[name]) {\n return ouraGet(DATE_ENDPOINTS[name], {\n start_date: args?.start_date,\n end_date: args?.end_date,\n });\n }\n if (name === \"get_heartrate\") {\n return ouraGet(\"heartrate\", {\n start_datetime: args?.start_datetime,\n end_datetime: args?.end_datetime,\n });\n }\n if (name === \"get_personal_info\") return ouraGet(\"personal_info\");\n throw new Error(`Unknown tool: ${name}`);\n}\n\n// ── MCP JSON-RPC handler (streamable HTTP, single-response mode) ───────────\nasync function handleMcp(req: Request): Promise {\n const msg = await req.json();\n const reply = (result: any, id: any) =>\n new Response(JSON.stringify({ jsonrpc: \"2.0\", id, result }), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n const fail = (code: number, message: string, id: any) =>\n new Response(JSON.stringify({ jsonrpc: \"2.0\", id, error: { code, message } }), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n\n const { method, id, params } = msg;\n\n // notifications carry no id and expect no body\n if (method?.startsWith(\"notifications/\")) return new Response(null, { status: 202 });\n\n if (method === \"initialize\") {\n return reply(\n {\n protocolVersion: params?.protocolVersion ?? 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