pairing: isolate account-scoped allowlist and pending requests

src/pairing/pairing-store.test.ts

@@ -257,7 +257,7 @@ describe("pairing store", () => {
     });
   });
 
-  it("reads sync allowFrom with scoped + legacy dedupe and wildcard filtering", async () => {
+  it("reads sync allowFrom with account-scoped isolation and wildcard filtering", async () => {
     await withTempStateDir(async (stateDir) => {
       await writeAllowFromFixture({
         stateDir,
@@ -273,11 +273,37 @@ describe("pairing store", () => {
 
       const scoped = readChannelAllowFromStoreSync("telegram", process.env, "yy");
       const channelScoped = readChannelAllowFromStoreSync("telegram");
-      expect(scoped).toEqual(["1002", "1001"]);
+      expect(scoped).toEqual(["1002", "1001", "1002"]);
       expect(channelScoped).toEqual(["1001", "1001"]);
     });
   });
 
+  it("does not reuse pairing requests across accounts for the same sender id", async () => {
+    await withTempStateDir(async () => {
+      const first = await upsertChannelPairingRequest({
+        channel: "telegram",
+        accountId: "alpha",
+        id: "12345",
+      });
+      const second = await upsertChannelPairingRequest({
+        channel: "telegram",
+        accountId: "beta",
+        id: "12345",
+      });
+
+      expect(first.created).toBe(true);
+      expect(second.created).toBe(true);
+      expect(second.code).not.toBe(first.code);
+
+      const alpha = await listChannelPairingRequests("telegram", process.env, "alpha");
+      const beta = await listChannelPairingRequests("telegram", process.env, "beta");
+      expect(alpha).toHaveLength(1);
+      expect(beta).toHaveLength(1);
+      expect(alpha[0]?.code).toBe(first.code);
+      expect(beta[0]?.code).toBe(second.code);
+    });
+  });
+
   it("reads legacy channel-scoped allowFrom for default account", async () => {
     await withTempStateDir(async (stateDir) => {
       await writeAllowFromFixture({ stateDir, channel: "telegram", allowFrom: ["1001"] });

src/pairing/pairing-store.ts

@@ -218,6 +218,12 @@ function requestMatchesAccountId(entry: PairingRequest, normalizedAccountId: str
   );
 }
 
+function shouldIncludeLegacyAllowFromEntries(normalizedAccountId: string): boolean {
+  // Keep backward compatibility for legacy channel-scoped allowFrom only on default account.
+  // Non-default accounts should remain isolated to avoid cross-account implicit approvals.
+  return !normalizedAccountId || normalizedAccountId === "default";
+}
+
 function normalizeId(value: string | number): string {
   return String(value).trim();
 }
@@ -344,8 +350,11 @@ export async function readChannelAllowFromStore(
 
   const scopedPath = resolveAllowFromPath(channel, env, accountId);
   const scopedEntries = await readAllowFromStateForPath(channel, scopedPath);
+  if (!shouldIncludeLegacyAllowFromEntries(normalizedAccountId)) {
+    return scopedEntries;
+  }
   // Backward compatibility: legacy channel-level allowFrom store was unscoped.
-  // Keep honoring it alongside account-scoped files to prevent re-pair prompts after upgrades.
+  // Keep honoring it for default account to prevent re-pair prompts after upgrades.
   const legacyPath = resolveAllowFromPath(channel, env);
   const legacyEntries = await readAllowFromStateForPath(channel, legacyPath);
   return dedupePreserveOrder([...scopedEntries, ...legacyEntries]);
@@ -364,6 +373,9 @@ export function readChannelAllowFromStoreSync(
 
   const scopedPath = resolveAllowFromPath(channel, env, accountId);
   const scopedEntries = readAllowFromStateForPathSync(channel, scopedPath);
+  if (!shouldIncludeLegacyAllowFromEntries(normalizedAccountId)) {
+    return scopedEntries;
+  }
   const legacyPath = resolveAllowFromPath(channel, env);
   const legacyEntries = readAllowFromStateForPathSync(channel, legacyPath);
   return dedupePreserveOrder([...scopedEntries, ...legacyEntries]);
@@ -503,7 +515,12 @@ export async function upsertChannelPairingRequest(params: {
         nowMs,
       );
       reqs = prunedExpired;
-      const existingIdx = reqs.findIndex((r) => r.id === id);
+      const existingIdx = reqs.findIndex((r) => {
+        if (r.id !== id) {
+          return false;
+        }
+        return requestMatchesAccountId(r, normalizePairingAccountId(normalizedAccountId));
+      });
       const existingCodes = new Set(
         reqs.map((req) =>
           String(req.code ?? "")