fix(communities): find self-hosted relays that predate host-bound NIP-11

src/features/communities/FindCommunity.test.tsx

@@ -425,7 +425,9 @@ it.each([
   ],
   [
     "a Buzz relay with no community here",
-    Response.json({ name: "Buzz Relay" }),
+    new Response("relay: no community is configured for this host", {
+      status: 404,
+    }),
     "No community is set up at this address.",
   ],
 ])("%s offers only Cancel", async (_label, answer, message) => {

src/features/communities/find-community.test.ts

@@ -116,8 +116,9 @@ it.each([
   [
     "a Buzz relay with no community bound to this host",
     {
-      "/": Response.json({ name: "Buzz Relay", version: "1.4.2" }),
-      "/api/join-policy": Response.json({}),
+      "/": new Response("relay: no community is configured for this host", {
+        status: 404,
+      }),
     },
     "no-community",
   ],
@@ -130,6 +131,22 @@ it.each([
   },
 );
 
+it("finds a released relay that does not advertise host-bound fields", async () => {
+  // relay-v0.2.1 (the Helm chart's image) serves NIP-11 without
+  // read_state_snapshot or buzz_v1, and without icon until one is set.
+  await expect(
+    find({
+      "/": Response.json({
+        name: "Buzz Relay",
+        software: "https://github.com/block/buzz",
+        version: "0.2.1",
+        self,
+      }),
+      "/api/join-policy": Response.json({}),
+    }),
+  ).resolves.toMatchObject({ host: "relay.example.com:8443", policy: null });
+});
+
 it.each([
   ["404", html(404), null],
   ["{}", Response.json({}), null],

src/features/communities/find-community.ts

@@ -77,8 +77,16 @@ async function policyAnswer(response: Response) {
   }
 }
 
+/** buzz-relay's NIP-11 answer for a host it maps to no community. */
+const NO_COMMUNITY = "relay: no community is configured for this host";
+
 async function relayInfo(response: Response) {
   if (response.status >= 500) throw new FindCommunityError("unreachable");
+  if (
+    response.status === 404 &&
+    (await response.text().catch(() => "")) === NO_COMMUNITY
+  )
+    throw new FindCommunityError("no-community");
   const body: unknown = response.ok
     ? await response.json().catch(() => undefined)
     : undefined;
@@ -94,12 +102,5 @@ async function relayInfo(response: Response) {
     )
   )
     throw new FindCommunityError("not-buzz");
-  // Host-bound fields are present only when the relay maps this host to a community.
-  if (
-    info.read_state_snapshot === undefined &&
-    info.icon === undefined &&
-    info.buzz_v1 === undefined
-  )
-    throw new FindCommunityError("no-community");
   return info;
 }