Threema Gateway

src/app/api/tenants/[name]/threema/route.ts

@@ -0,0 +1,168 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getSessionUser, canMutate } from "@/lib/session";
+import { getTenant } from "@/lib/k8s";
+import {
+  writePackageSecrets,
+  deletePackageSecrets,
+} from "@/lib/openbao";
+import { mintToken, revokeToken } from "@/lib/threema-relay";
+import { safeError } from "@/lib/errors";
+
+/**
+ * Threema package provisioning — special-cased because the credentials
+ * are platform-issued (relay mints them), not customer-supplied.
+ *
+ * POST /api/tenants/:name/threema
+ *   - Mints a per-tenant bearer + HMAC secret from the central relay.
+ *   - Writes both to OpenBao under
+ *     secret/data/tenants/<tenant-{name}>/threema-relay so the
+ *     operator's ExternalSecret can sync them into the tenant
+ *     namespace alongside other channel secrets.
+ *   - Returns 200 on success. The caller (PackageCard) then PATCHes
+ *     tenant.spec.packages to add "threema".
+ *
+ * DELETE /api/tenants/:name/threema
+ *   - Revokes the per-tenant token at the relay (cascades to all
+ *     routes — the relay's tokens.deleteToken also deletes routes).
+ *   - Deletes the OpenBao secret so the ExternalSecret/operator can
+ *     converge cleanly.
+ *   - Returns 200 on success even if no token existed (idempotent).
+ *
+ * Failure semantics
+ * -----------------
+ * On POST: if minting succeeds but the OpenBao write fails, we attempt
+ * to revoke the just-minted token before returning the error. That way
+ * the relay doesn't keep an orphan token row that nothing can use.
+ * Best-effort cleanup; if the revoke also fails, the relay admin can
+ * use DELETE /admin/tokens/<name> manually.
+ *
+ * On DELETE: we revoke FIRST, then delete OpenBao. If revoke fails we
+ * return the error and stop — leaving OpenBao alone means the pod's
+ * still-mounted secret keeps working in the brief window between
+ * "customer hits disable" and "operator reconciles spec without threema",
+ * which is more graceful than yanking the secret out from under a
+ * running pod.
+ */
+
+const VAULT_SUFFIX = "threema-relay";
+
+export async function POST(
+  _req: NextRequest,
+  { params }: { params: Promise<{ name: string }> },
+) {
+  const user = await getSessionUser();
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  if (!canMutate(user))
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+
+  const { name } = await params;
+
+  try {
+    const tenant = await getTenant(name);
+    if (!tenant)
+      return NextResponse.json({ error: "Not found" }, { status: 404 });
+    if (
+      !user.isPlatform &&
+      tenant.metadata.labels?.["pieced.ch/zitadel-org-id"] !== user.orgId
+    ) {
+      return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+    }
+
+    const minted = await mintToken(name);
+    if (!minted.ok) {
+      return NextResponse.json(
+        { error: `Relay mint failed: ${minted.message}` },
+        { status: minted.kind === "http" ? 502 : 503 },
+      );
+    }
+
+    try {
+      await writePackageSecrets(`tenant-${name}`, VAULT_SUFFIX, {
+        token: minted.token,
+        "hmac-secret": minted.hmacSecret,
+      });
+    } catch (e) {
+      // Compensate: revoke the just-minted token so the relay doesn't
+      // hold an orphan. Best-effort — log and continue surfacing the
+      // original error.
+      const revoke = await revokeToken(name);
+      if (!revoke.ok) {
+        console.error(
+          `[threema/provision] Compensating revoke failed for ${name}: ${revoke.message}`,
+        );
+      }
+      return NextResponse.json(
+        { error: `OpenBao write failed: ${safeError(e, "secret store unavailable")}` },
+        { status: 503 },
+      );
+    }
+
+    return NextResponse.json({ ok: true });
+  } catch (e) {
+    console.error("[threema/provision]", e);
+    return NextResponse.json(
+      { error: safeError(e, "Provisioning failed") },
+      { status: 500 },
+    );
+  }
+}
+
+export async function DELETE(
+  _req: NextRequest,
+  { params }: { params: Promise<{ name: string }> },
+) {
+  const user = await getSessionUser();
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  if (!canMutate(user))
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+
+  const { name } = await params;
+
+  try {
+    const tenant = await getTenant(name);
+    if (!tenant)
+      return NextResponse.json({ error: "Not found" }, { status: 404 });
+    if (
+      !user.isPlatform &&
+      tenant.metadata.labels?.["pieced.ch/zitadel-org-id"] !== user.orgId
+    ) {
+      return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+    }
+
+    const revoke = await revokeToken(name);
+    // 404 from relay = nothing to revoke = idempotent success.
+    if (!revoke.ok && !(revoke.kind === "http" && revoke.status === 404)) {
+      return NextResponse.json(
+        { error: `Relay revoke failed: ${revoke.message}` },
+        { status: revoke.kind === "http" ? 502 : 503 },
+      );
+    }
+
+    // Delete the OpenBao secret. Idempotent — deletePackageSecrets
+    // tolerates 404.
+    try {
+      await deletePackageSecrets(`tenant-${name}`, VAULT_SUFFIX);
+    } catch (e) {
+      // Already revoked at the relay — surface the openbao failure
+      // but keep the partial-success state visible.
+      return NextResponse.json(
+        {
+          error: `Token revoked, but OpenBao delete failed: ${safeError(e, "secret store unavailable")}`,
+          partial: true,
+        },
+        { status: 503 },
+      );
+    }
+
+    return NextResponse.json({
+      ok: true,
+      deletedRoutes: revoke.ok ? revoke.deletedRoutes : 0,
+    });
+  } catch (e) {
+    console.error("[threema/deprovision]", e);
+    return NextResponse.json(
+      { error: safeError(e, "Deprovisioning failed") },
+      { status: 500 },
+    );
+  }
+}

src/app/api/tenants/[name]/threema/routes/route.ts

@@ -0,0 +1,217 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { getSessionUser, canMutate } from "@/lib/session";
+import { getTenant, patchTenantSpec } from "@/lib/k8s";
+import {
+  createRoute,
+  deleteRoute,
+  isRouteConflictForOtherTenant,
+  isRouteConflictForSameTenant,
+  listRoutes,
+} from "@/lib/threema-relay";
+import { safeError } from "@/lib/errors";
+
+/**
+ * Threema route management — keeps three places in sync:
+ *
+ *   1. Relay DB (`routes` table)         — source of truth for uniqueness
+ *   2. K8s spec.channelUsers.threema     — what the operator sees
+ *   3. Customer UI                       — derived from (2)
+ *
+ * Add (POST) order: relay first (to claim uniqueness atomically), then
+ * K8s. On K8s failure we compensate by deleting the relay route.
+ *
+ * Remove (DELETE) order: K8s first (UI shows it gone immediately, which
+ * is the customer-facing semantic that matters), then relay. On relay
+ * failure we DO NOT rollback K8s — the customer wanted it gone, and
+ * the relay's stale route will be cleaned up on the next retry (deletes
+ * are idempotent at the relay).
+ *
+ * Read-modify-write race: patchTenantSpec uses K8s merge-patch on
+ * spec.channelUsers.threema, which REPLACES the entire array. We GET
+ * the latest array, mutate it, then PATCH. Two concurrent adds from the
+ * same customer's tabs can lose one of them. Acceptable at pilot scale
+ * (single-digit customers, low concurrency); revisit with SSA + field
+ * managers if it ever bites.
+ */
+
+const ROUTE_BODY = z.object({
+  threemaId: z
+    .string()
+    .regex(/^[A-Z0-9]{8}$/, "Threema ID must be 8 uppercase alphanumeric chars (no asterisk)"),
+});
+
+// ---- helpers --------------------------------------------------------------
+
+async function loadTenantOrError(name: string, user: Awaited<ReturnType<typeof getSessionUser>>) {
+  if (!user) return { error: NextResponse.json({ error: "Unauthorized" }, { status: 401 }) };
+  if (!canMutate(user))
+    return { error: NextResponse.json({ error: "Forbidden" }, { status: 403 }) };
+
+  const tenant = await getTenant(name);
+  if (!tenant)
+    return { error: NextResponse.json({ error: "Not found" }, { status: 404 }) };
+  if (
+    !user.isPlatform &&
+    tenant.metadata.labels?.["pieced.ch/zitadel-org-id"] !== user.orgId
+  ) {
+    return { error: NextResponse.json({ error: "Forbidden" }, { status: 403 }) };
+  }
+  return { tenant };
+}
+
+function currentThreemaIds(tenantSpec: any): string[] {
+  const cu = tenantSpec?.channelUsers ?? {};
+  const ids = cu.threema;
+  return Array.isArray(ids) ? ids.filter((x) => typeof x === "string") : [];
+}
+
+// ---- GET ------------------------------------------------------------------
+
+export async function GET(
+  _req: NextRequest,
+  { params }: { params: Promise<{ name: string }> },
+) {
+  const user = await getSessionUser();
+  const { name } = await params;
+  const loaded = await loadTenantOrError(name, user);
+  if (loaded.error) return loaded.error;
+
+  const res = await listRoutes(name);
+  if (!res.ok) {
+    return NextResponse.json(
+      { error: `Relay list failed: ${res.message}` },
+      { status: res.kind === "http" ? 502 : 503 },
+    );
+  }
+  return NextResponse.json({ routes: res.routes });
+}
+
+// ---- POST -----------------------------------------------------------------
+
+export async function POST(
+  req: NextRequest,
+  { params }: { params: Promise<{ name: string }> },
+) {
+  const user = await getSessionUser();
+  const { name } = await params;
+  const loaded = await loadTenantOrError(name, user);
+  if (loaded.error) return loaded.error;
+  const tenant = loaded.tenant;
+
+  const body = await req.json().catch(() => null);
+  const parsed = ROUTE_BODY.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid threemaId", details: parsed.error.flatten() },
+      { status: 400 },
+    );
+  }
+  const threemaId = parsed.data.threemaId;
+
+  // Step 1: claim at the relay. Uniqueness is enforced here.
+  const claim = await createRoute(name, threemaId);
+  if (!claim.ok) {
+    if (isRouteConflictForOtherTenant(claim, name)) {
+      return NextResponse.json(
+        { error: "This Threema ID is already registered to another tenant" },
+        { status: 409 },
+      );
+    }
+    if (!isRouteConflictForSameTenant(claim, name)) {
+      // Genuine non-409 failure
+      return NextResponse.json(
+        { error: `Relay create failed: ${claim.message}` },
+        { status: claim.kind === "http" ? claim.status : 503 },
+      );
+    }
+    // Idempotent self-claim — continue to step 2 to ensure K8s mirrors it.
+  }
+
+  // Step 2: add to K8s spec.channelUsers.threema (idempotent).
+  const existing = currentThreemaIds(tenant!.spec);
+  if (!existing.includes(threemaId)) {
+    const next = [...existing, threemaId];
+    try {
+      await patchTenantSpec(name, {
+        channelUsers: {
+          ...(tenant!.spec?.channelUsers ?? {}),
+          threema: next,
+        } as Record<string, string[]>,
+      });
+    } catch (e) {
+      // Compensate: drop the relay route so we don't leave an orphan.
+      const compensate = await deleteRoute(name, threemaId);
+      if (!compensate.ok) {
+        console.error(
+          `[threema/routes] Compensating route delete failed for ${name}/${threemaId}: ${compensate.message}`,
+        );
+      }
+      return NextResponse.json(
+        { error: `K8s patch failed: ${safeError(e, "patch failed")}` },
+        { status: 500 },
+      );
+    }
+  }
+
+  return NextResponse.json({ ok: true, threemaId });
+}
+
+// ---- DELETE ---------------------------------------------------------------
+
+export async function DELETE(
+  req: NextRequest,
+  { params }: { params: Promise<{ name: string }> },
+) {
+  const user = await getSessionUser();
+  const { name } = await params;
+  const loaded = await loadTenantOrError(name, user);
+  if (loaded.error) return loaded.error;
+  const tenant = loaded.tenant;
+
+  // threemaId arrives as ?threemaId=... since DELETE bodies are uneven across clients.
+  const threemaId = new URL(req.url).searchParams.get("threemaId") ?? "";
+  const parsed = ROUTE_BODY.safeParse({ threemaId });
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid threemaId", details: parsed.error.flatten() },
+      { status: 400 },
+    );
+  }
+
+  // Step 1: drop from K8s (idempotent).
+  const existing = currentThreemaIds(tenant!.spec);
+  if (existing.includes(parsed.data.threemaId)) {
+    const next = existing.filter((id) => id !== parsed.data.threemaId);
+    try {
+      await patchTenantSpec(name, {
+        channelUsers: {
+          ...(tenant!.spec?.channelUsers ?? {}),
+          threema: next,
+        } as Record<string, string[]>,
+      });
+    } catch (e) {
+      return NextResponse.json(
+        { error: `K8s patch failed: ${safeError(e, "patch failed")}` },
+        { status: 500 },
+      );
+    }
+  }
+
+  // Step 2: drop at relay (also idempotent — 404 is fine).
+  const dropped = await deleteRoute(name, parsed.data.threemaId);
+  if (!dropped.ok && !(dropped.kind === "http" && dropped.status === 404)) {
+    // K8s is already updated; surface but don't rollback. Next time the
+    // user toggles, both will converge.
+    return NextResponse.json(
+      {
+        ok: true,
+        threemaId: parsed.data.threemaId,
+        warning: `Removed from K8s but relay drop failed: ${dropped.message}`,
+      },
+      { status: 200 },
+    );
+  }
+
+  return NextResponse.json({ ok: true, threemaId: parsed.data.threemaId });
+}

src/components/channel-users/channel-users.tsx

@@ -8,12 +8,26 @@ import { useRouter } from "next/navigation";
 const CHANNEL_ID_HELP: Record<string, string> = {
   telegram: "telegramIdHelp",
   discord: "discordIdHelp",
+  threema: "threemaIdHelp",
   // email entry dropped in the Phase A rework — IMAP/SMTP is handled by
   // the `mail` skill (category=skill, not channel), so it never appears
   // in `enabledChannels`. If a future channel is added to the catalog,
   // give it an entry here so the help blurb renders.
 };
 
+/**
+ * Channels whose user list is managed through a dedicated endpoint
+ * instead of the generic PATCH /api/tenants/:name flow.
+ *
+ * Threema is the only one today — adding/removing a Threema ID has to
+ * synchronise with the central pieced-threema-gateway relay's `routes`
+ * table (uniqueness enforced there, not in K8s). The
+ * /api/tenants/:name/threema/routes endpoint owns that two-step
+ * coordination (relay first, then K8s, with compensation on K8s
+ * failure). Other channels just patch the K8s spec directly.
+ */
+const RELAY_MANAGED_CHANNELS = new Set(["threema"]);
+
 interface ChannelUsersProps {
   tenantName: string;
   /** Currently enabled channel packages (e.g. ["telegram", "discord"]) */
@@ -63,6 +77,70 @@ export function ChannelUsers({
     [tenantName, router]
   );
 
+  /**
+   * Threema (and any future relay-managed channel) uses a dedicated
+   * endpoint that synchronises the central relay's routes table with
+   * the K8s spec atomically. We call it per-ID rather than sending the
+   * whole array because uniqueness is enforced ID-by-ID at the relay,
+   * and the error UX of "this ID is taken" is per-add.
+   */
+  const addToRelayChannel = useCallback(
+    async (channel: string, threemaId: string) => {
+      setSaving(true);
+      setError("");
+      try {
+        const res = await fetch(
+          `/api/tenants/${tenantName}/${channel}/routes`,
+          {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ threemaId }),
+          }
+        );
+        if (!res.ok) {
+          const data = await res.json().catch(() => ({}));
+          throw new Error(data.error || `Add failed (HTTP ${res.status})`);
+        }
+        setChannelUsers((prev) => {
+          const current = prev[channel] ?? [];
+          if (current.includes(threemaId)) return prev;
+          return { ...prev, [channel]: [...current, threemaId] };
+        });
+        router.refresh();
+      } catch (e: any) {
+        setError(e.message);
+      } finally {
+        setSaving(false);
+      }
+    },
+    [tenantName, router]
+  );
+
+  const removeFromRelayChannel = useCallback(
+    async (channel: string, threemaId: string) => {
+      setSaving(true);
+      setError("");
+      try {
+        const url = `/api/tenants/${tenantName}/${channel}/routes?threemaId=${encodeURIComponent(threemaId)}`;
+        const res = await fetch(url, { method: "DELETE" });
+        if (!res.ok) {
+          const data = await res.json().catch(() => ({}));
+          throw new Error(data.error || `Remove failed (HTTP ${res.status})`);
+        }
+        setChannelUsers((prev) => {
+          const current = prev[channel] ?? [];
+          return { ...prev, [channel]: current.filter((id) => id !== threemaId) };
+        });
+        router.refresh();
+      } catch (e: any) {
+        setError(e.message);
+      } finally {
+        setSaving(false);
+      }
+    },
+    [tenantName, router]
+  );
+
   const handleAdd = useCallback(
     (channel: string) => {
       const userId = inputValues[channel]?.trim();
@@ -74,18 +152,27 @@ export function ChannelUsers({
         return;
       }
 
-      const updated = {
-        ...channelUsers,
-        [channel]: [...current, userId],
-      };
       setInputValues((prev) => ({ ...prev, [channel]: "" }));
-      updateChannelUsers(updated);
+
+      if (RELAY_MANAGED_CHANNELS.has(channel)) {
+        void addToRelayChannel(channel, userId);
+      } else {
+        const updated = {
+          ...channelUsers,
+          [channel]: [...current, userId],
+        };
+        updateChannelUsers(updated);
+      }
     },
-    [channelUsers, inputValues, updateChannelUsers, t]
+    [channelUsers, inputValues, updateChannelUsers, addToRelayChannel, t]
   );
 
   const handleRemove = useCallback(
     (channel: string, userId: string) => {
+      if (RELAY_MANAGED_CHANNELS.has(channel)) {
+        void removeFromRelayChannel(channel, userId);
+        return;
+      }
       const current = channelUsers[channel] || [];
       const updated = {
         ...channelUsers,
@@ -93,7 +180,7 @@ export function ChannelUsers({
       };
       updateChannelUsers(updated);
     },
-    [channelUsers, updateChannelUsers]
+    [channelUsers, updateChannelUsers, removeFromRelayChannel]
   );
 
   if (enabledChannels.length === 0) return null;

src/components/packages/package-card.tsx

@@ -30,6 +30,26 @@ export function PackageCard({
   const [error, setError] = useState<string | null>(null);
 
   async function handleEnable() {
+    if (pkg.customProvisioning) {
+      // Platform-side provisioning, then add to packages list.
+      setSaving(true);
+      setError(null);
+      try {
+        const provRes = await fetch(`/api/tenants/${tenantName}/${pkg.id}`, {
+          method: "POST",
+        });
+        if (!provRes.ok) {
+          const err = await provRes.json().catch(() => ({}));
+          throw new Error(err.error || `Provisioning failed (HTTP ${provRes.status})`);
+        }
+        await togglePackage(true);
+      } catch (e: any) {
+        setError(e.message);
+      } finally {
+        setSaving(false);
+      }
+      return;
+    }
     if (pkg.requiresSecrets) {
       setShowModal(true);
       setSecrets({});
@@ -40,6 +60,34 @@ export function PackageCard({
     await togglePackage(true);
   }
 
+  async function handleDisable() {
+    setSaving(true);
+    setError(null);
+    try {
+      if (pkg.customProvisioning) {
+        // Revoke platform-side credentials FIRST so the relay drops
+        // routes before the operator removes the channel from the
+        // OpenClaw config. Partial-success (token revoked, OpenBao
+        // delete failed) returns 503 with partial=true and we surface
+        // the error rather than continuing — the secret may still be
+        // valid in OpenBao and rolling back the relay revoke isn't
+        // possible (it cascaded to routes).
+        const deprovRes = await fetch(`/api/tenants/${tenantName}/${pkg.id}`, {
+          method: "DELETE",
+        });
+        if (!deprovRes.ok) {
+          const err = await deprovRes.json().catch(() => ({}));
+          throw new Error(err.error || `Deprovisioning failed (HTTP ${deprovRes.status})`);
+        }
+      }
+      await togglePackage(false);
+    } catch (e: any) {
+      setError(e.message);
+    } finally {
+      setSaving(false);
+    }
+  }
+
   async function togglePackage(enable: boolean) {
     setSaving(true);
     try {
@@ -124,7 +172,7 @@ export function PackageCard({
           )}
           {canEdit ? (
             <button
-              onClick={enabled ? () => togglePackage(false) : handleEnable}
+              onClick={enabled ? handleDisable : handleEnable}
               disabled={saving}
               className={`ml-auto rounded-lg px-3 py-1.5 text-xs font-medium transition-all cursor-pointer ${
                 enabled

src/lib/packages.ts

@@ -19,6 +19,17 @@
  *               pieced-tts-talk).
  *   - channel — messaging integration.
  *   - skill   — ClawHub skill install.
+ *
+ * Custom provisioning (Threema):
+ *   The `threema` channel sets `requiresSecrets: false` because its
+ *   credentials are platform-issued, not customer-entered. Enabling
+ *   threema goes through a dedicated endpoint
+ *   (/api/tenants/:name/threema) that mints token + HMAC secret from
+ *   the central pieced-threema-gateway relay and writes them to OpenBao
+ *   at secret/data/tenants/<name>/threema-relay before the package is
+ *   added to spec.packages. Disabling reverses both steps. The
+ *   `customProvisioning` flag here tells the package-card UI to use
+ *   that endpoint instead of the standard /secrets+PATCH dance.
  */
 
 export interface PackageSecretField {
@@ -38,6 +49,14 @@ export interface PackageDef {
   instructionsKey?: string;
   disclaimerKey?: string;
   category: PackageCategory;
+  /**
+   * When true, enabling/disabling this package goes through
+   * /api/tenants/:name/<id> (POST/DELETE) instead of the generic
+   * /secrets+PATCH flow. The handler at that path does platform-side
+   * provisioning (mint credentials, register with sibling services, etc.)
+   * that the customer is not aware of.
+   */
+  customProvisioning?: boolean;
 }
 
 export const PACKAGE_CATALOG: PackageDef[] = [
@@ -121,6 +140,21 @@ export const PACKAGE_CATALOG: PackageDef[] = [
     disclaimerKey: "packages.discord.disclaimer",
     category: "channel",
   },
+  {
+    id: "threema",
+    name: "Threema",
+    descriptionKey: "packages.threema.description",
+    // No customer-entered secrets. The token + hmac secret are minted
+    // server-side by the relay's /admin/tokens endpoint when the
+    // package is enabled, and stored in OpenBao by the portal. The
+    // `customProvisioning` flag steers the PackageCard UI through the
+    // dedicated /api/tenants/:name/threema endpoint instead.
+    requiresSecrets: false,
+    customProvisioning: true,
+    instructionsKey: "packages.threema.instructions",
+    disclaimerKey: "packages.threema.disclaimer",
+    category: "channel",
+  },
 
   // -------------------------------------------------------------------------
   // SKILLS

src/lib/threema-relay.ts

@@ -0,0 +1,202 @@
+/**
+ * Admin client for the central pieced-threema-gateway relay.
+ *
+ * All calls authenticate with a static admin bearer (THREEMA_RELAY_ADMIN_TOKEN
+ * from env, sourced from OpenBao at secret/data/threema-gateway/admin). The
+ * portal is the only caller; never expose these functions through a public
+ * HTTP surface.
+ *
+ * Resilience: every method returns a strongly-typed result rather than
+ * throwing. Network errors surface as `{ ok: false, kind: 'network' }`,
+ * 4xx/5xx as `{ ok: false, kind: 'http', status, ... }`. Callers that need
+ * to compensate (e.g. delete a route after a K8s patch failure) can
+ * inspect `kind` to decide whether retry is sensible.
+ */
+
+const RELAY_URL = (process.env.THREEMA_RELAY_URL ?? "").replace(/\/+$/, "");
+const ADMIN_TOKEN = process.env.THREEMA_RELAY_ADMIN_TOKEN ?? "";
+
+function assertConfigured(): void {
+  if (!RELAY_URL) throw new Error("THREEMA_RELAY_URL not set");
+  if (!ADMIN_TOKEN) throw new Error("THREEMA_RELAY_ADMIN_TOKEN not set");
+}
+
+type RelayError =
+  | { ok: false; kind: "network"; message: string }
+  | { ok: false; kind: "http"; status: number; message: string; body?: unknown };
+
+export type RelayResult<T> = ({ ok: true } & T) | RelayError;
+
+async function call<T>(
+  path: string,
+  init: RequestInit,
+): Promise<RelayResult<T>> {
+  assertConfigured();
+  try {
+    const res = await fetch(`${RELAY_URL}${path}`, {
+      ...init,
+      headers: {
+        ...(init.headers ?? {}),
+        Authorization: `Bearer ${ADMIN_TOKEN}`,
+        "Content-Type": "application/json",
+      },
+    });
+    let body: unknown = null;
+    const text = await res.text().catch(() => "");
+    if (text) {
+      try {
+        body = JSON.parse(text);
+      } catch {
+        body = text;
+      }
+    }
+    if (!res.ok) {
+      const message =
+        (body && typeof body === "object" && "error" in body && typeof (body as Record<string, unknown>).error === "string"
+          ? ((body as Record<string, unknown>).error as string)
+          : `HTTP ${res.status}`);
+      return { ok: false, kind: "http", status: res.status, message, body };
+    }
+    return { ok: true, ...(body as Record<string, unknown>) } as RelayResult<T>;
+  } catch (e) {
+    return { ok: false, kind: "network", message: (e as Error).message };
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Tokens
+// ---------------------------------------------------------------------------
+
+/** Mint (or rotate) per-tenant bearer + HMAC secret. */
+export function mintToken(
+  tenantName: string,
+): Promise<RelayResult<{ token: string; hmacSecret: string }>> {
+  return call("/admin/tokens", {
+    method: "POST",
+    body: JSON.stringify({ tenantName }),
+  });
+}
+
+/**
+ * Revoke per-tenant token. Cascades — relay also deletes all routes
+ * owned by this tenant.
+ */
+export function revokeToken(
+  tenantName: string,
+): Promise<RelayResult<{ deletedRoutes: number }>> {
+  return call(`/admin/tokens/${encodeURIComponent(tenantName)}`, {
+    method: "DELETE",
+  });
+}
+
+export function tokenExists(
+  tenantName: string,
+): Promise<RelayResult<{ exists: true }>> {
+  return call(`/admin/tokens/${encodeURIComponent(tenantName)}`, {
+    method: "GET",
+  });
+}
+
+// ---------------------------------------------------------------------------
+// Routes
+// ---------------------------------------------------------------------------
+
+export interface RouteRow {
+  threema_id: string;
+  tenant_name: string;
+  created_at: string;
+  created_by: string;
+}
+
+export function listRoutes(
+  tenantName: string,
+): Promise<RelayResult<{ routes: RouteRow[] }>> {
+  return call(`/admin/routes?tenant=${encodeURIComponent(tenantName)}`, {
+    method: "GET",
+  });
+}
+
+/**
+ * Create a route. The relay enforces uniqueness — on conflict returns
+ * status 409 with body `{ ownedBy: <tenantName> | null }`. Callers
+ * should inspect `kind === 'http'` + status 409 + body.ownedBy to
+ * distinguish idempotent self-claim from real conflict.
+ */
+export function createRoute(
+  tenantName: string,
+  threemaId: string,
+): Promise<RelayResult<{ ok: true }>> {
+  return call("/admin/routes", {
+    method: "POST",
+    body: JSON.stringify({ tenantName, threemaId }),
+  });
+}
+
+export function deleteRoute(
+  tenantName: string,
+  threemaId: string,
+): Promise<RelayResult<{ ok: true }>> {
+  return call(
+    `/admin/routes/${encodeURIComponent(threemaId)}?tenant=${encodeURIComponent(tenantName)}`,
+    { method: "DELETE" },
+  );
+}
+
+// ---------------------------------------------------------------------------
+// Usage
+// ---------------------------------------------------------------------------
+
+export interface UsageBreakdown {
+  tenant: string;
+  from: string;
+  to: string;
+  totals: { in: number; out: number };
+  daily: Array<{ day: string; direction: "in" | "out"; count: number }>;
+}
+
+export function getUsage(
+  tenantName: string,
+  from?: Date,
+  to?: Date,
+): Promise<RelayResult<UsageBreakdown>> {
+  const qs = new URLSearchParams({ tenant: tenantName });
+  if (from) qs.set("from", from.toISOString());
+  if (to) qs.set("to", to.toISOString());
+  return call(`/admin/usage?${qs.toString()}`, { method: "GET" });
+}
+
+// ---------------------------------------------------------------------------
+// Health
+// ---------------------------------------------------------------------------
+
+export function health(): Promise<RelayResult<{ credits: number }>> {
+  return call("/admin/health", { method: "GET" });
+}
+
+// ---------------------------------------------------------------------------
+// Helpers for caller code
+// ---------------------------------------------------------------------------
+
+/**
+ * Type guard: did this route-create fail because the ID is owned by
+ * someone else? Distinguishes from "owned by SAME tenant" (idempotent).
+ */
+export function isRouteConflictForOtherTenant(
+  result: RelayResult<{ ok: true }>,
+  tenantName: string,
+): boolean {
+  if (result.ok) return false;
+  if (result.kind !== "http" || result.status !== 409) return false;
+  const body = result.body as { ownedBy?: string | null } | undefined;
+  return !!body?.ownedBy && body.ownedBy !== tenantName;
+}
+
+export function isRouteConflictForSameTenant(
+  result: RelayResult<{ ok: true }>,
+  tenantName: string,
+): boolean {
+  if (result.ok) return false;
+  if (result.kind !== "http" || result.status !== 409) return false;
+  const body = result.body as { ownedBy?: string | null } | undefined;
+  return body?.ownedBy === tenantName;
+}