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\"\";\nconst SERVICE_ACCOUNT_DID = Deno.env.get(\"MAPPED_AT_DID\") ?? \"\";\n\n// ── Routing ───────────────────────────────────────────────────────────────────\n\nexport function handler(req: Request) {\n const url = new URL(req.url);\n\n if (req.method === \"GET\") {\n return Response.json({ ok: true });\n }\n\n if (req.method !== \"POST\") {\n return Response.json({ error: \"Method not allowed\" }, { status: 405 });\n }\n\n if (url.pathname === \"/register\") return handleRegister(req);\n if (url.pathname === \"/submit-trail\") return handleSubmitTrail(req);\n\n return Response.json({ error: \"Not found\" }, { status: 404 });\n}\n\n// ── Helpers ───────────────────────────────────────────────────────────────────\n\n// Resolves a DID to the PDS serviceEndpoint via the DID document.\n// Supports did:plc (via plc.directory) and did:web.\nasync function resolvePds(did: string): Promise {\n try {\n let docUrl: string;\n if (did.startsWith(\"did:plc:\")) {\n docUrl = `https://plc.directory/${did}`;\n } else if (did.startsWith(\"did:web:\")) {\n const domain = did.slice(8).replace(/:/g, \"/\");\n docUrl = `https://${domain}/.well-known/did.json`;\n } else {\n return null;\n }\n const res = await fetch(docUrl);\n if (!res.ok) return null;\n const doc = await res.json();\n const svc = (doc.service ?? []).find(\n (s: { type: string }) => s.type === \"AtprotoPersonalDataServer\",\n ) as { serviceEndpoint: string } | undefined;\n return svc?.serviceEndpoint ?? null;\n } catch {\n return null;\n }\n}\n\n// Authenticates as the service account and returns a short-lived access JWT.\n// Re-authenticates on every call — acceptable for low-traffic usage.\nasync function getServiceAccountToken(): Promise {\n const identifier = Deno.env.get(\"MAPPED_AT_IDENTIFIER\")!;\n const password = Deno.env.get(\"MAPPED_AT_APP_PASSWORD\")!;\n const res = await fetch(\n `${SERVICE_ACCOUNT_PDS}/xrpc/com.atproto.server.createSession`,\n {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ identifier, password }),\n },\n );\n if (!res.ok) throw new Error(`Service account auth failed: ${res.status}`);\n const { accessJwt } = await res.json();\n return accessJwt;\n}\n\n// ── Handlers ──────────────────────────────────────────────────────────────────\n\nasync function handleRegister(req: Request): Promise {\n // Parse body\n let body: { did?: unknown };\n try {\n body = await req.json();\n } catch {\n return Response.json({ error: \"Invalid JSON\" }, { status: 400 });\n }\n\n const { did } = body;\n if (!did || typeof did !== \"string\") {\n return Response.json(\n { error: \"Missing required field: did\" },\n {\n status: 400,\n },\n );\n }\n if (!did.startsWith(\"did:\")) {\n return Response.json({ error: \"Invalid DID format\" }, { status: 400 });\n }\n\n // Verify profile exists on the user's PDS\n const pds = await resolvePds(did);\n if (!pds) {\n return Response.json(\n { error: \"Could not resolve DID to a PDS\" },\n {\n status: 400,\n },\n );\n }\n\n const profileRes = await fetch(\n `${pds}/xrpc/com.atproto.repo.getRecord?` +\n `repo=${encodeURIComponent(did)}&collection=at.mapped.profile&rkey=self`,\n );\n if (!profileRes.ok) {\n return Response.json(\n { error: \"at.mapped.profile not found on user PDS\" },\n {\n status: 400,\n },\n );\n }\n\n // Idempotency: return early if already registered\n const membersRes = await fetch(\n `${SERVICE_ACCOUNT_PDS}/xrpc/com.atproto.repo.listRecords?` +\n `repo=${encodeURIComponent(\n SERVICE_ACCOUNT_DID,\n )}&collection=at.mapped.member&limit=100`,\n );\n if (membersRes.ok) {\n const { records } = (await membersRes.json()) as {\n records: { value: { did: string } }[];\n };\n if ((records ?? []).some((r) => r.value.did === did)) {\n return Response.json({ ok: true });\n }\n }\n\n // Create member record on service account\n const token = await getServiceAccountToken();\n const createRes = await fetch(\n `${SERVICE_ACCOUNT_PDS}/xrpc/com.atproto.repo.createRecord`,\n {\n method: \"POST\",\n headers: {\n \"Content-Type\": \"application/json\",\n Authorization: `Bearer ${token}`,\n },\n body: JSON.stringify({\n repo: SERVICE_ACCOUNT_DID,\n collection: \"at.mapped.member\",\n record: {\n $type: \"at.mapped.member\",\n did,\n joinedAt: new Date().toISOString(),\n },\n }),\n },\n );\n\n if (!createRes.ok) {\n const err = await createRes.text();\n return Response.json(\n { error: `Failed to create member record: ${err}` },\n { status: 500 },\n );\n }\n\n return Response.json({ ok: true });\n}\n\nasync function handleSubmitTrail(req: Request): Promise {\n // Parse body\n let body: {\n did?: unknown;\n trail?: {\n name?: unknown;\n polyline?: unknown;\n activityType?: unknown;\n locations?: unknown;\n };\n };\n try {\n body = await req.json();\n } catch {\n return Response.json({ error: \"Invalid JSON\" }, { status: 400 });\n }\n\n const { did, trail } = body;\n if (!did || typeof did !== \"string\") {\n return Response.json(\n { error: \"Missing required field: did\" },\n {\n status: 400,\n },\n );\n }\n if (!did.startsWith(\"did:\")) {\n return Response.json({ error: \"Invalid DID format\" }, { status: 400 });\n }\n if (!trail?.name || typeof trail.name !== \"string\") {\n return Response.json(\n { error: \"Missing required field: trail.name\" },\n {\n status: 400,\n },\n );\n }\n\n // Verify membership\n const membersRes = await fetch(\n `${SERVICE_ACCOUNT_PDS}/xrpc/com.atproto.repo.listRecords?` +\n `repo=${encodeURIComponent(\n SERVICE_ACCOUNT_DID,\n )}&collection=at.mapped.member&limit=100`,\n );\n if (!membersRes.ok) {\n return Response.json(\n { error: \"Could not verify membership\" },\n {\n status: 500,\n },\n );\n }\n const { records } = (await membersRes.json()) as {\n records: { value: { did: string } }[];\n };\n const isMember = (records ?? 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Diff · v29