refactor: harden msteams lifecycle and attachment flows

extensions/msteams/src/attachments/download.ts

@@ -6,12 +6,12 @@ import {
   isDownloadableAttachment,
   isRecord,
   isUrlAllowed,
+  type MSTeamsAttachmentFetchPolicy,
   normalizeContentType,
   resolveMediaSsrfPolicy,
+  resolveAttachmentFetchPolicy,
   resolveRequestUrl,
-  resolveAuthAllowedHosts,
-  resolveAllowedHosts,
-  safeFetch,
+  safeFetchWithPolicy,
 } from "./shared.js";
 import type {
   MSTeamsAccessTokenProvider,
@@ -95,12 +95,11 @@ async function fetchWithAuthFallback(params: {
   tokenProvider?: MSTeamsAccessTokenProvider;
   fetchFn?: typeof fetch;
   requestInit?: RequestInit;
-  allowHosts: string[];
-  authAllowHosts: string[];
+  policy: MSTeamsAttachmentFetchPolicy;
 }): Promise<Response> {
-  const firstAttempt = await safeFetch({
+  const firstAttempt = await safeFetchWithPolicy({
     url: params.url,
-    allowHosts: params.allowHosts,
+    policy: params.policy,
     fetchFn: params.fetchFn,
     requestInit: params.requestInit,
   });
@@ -113,7 +112,7 @@ async function fetchWithAuthFallback(params: {
   if (firstAttempt.status !== 401 && firstAttempt.status !== 403) {
     return firstAttempt;
   }
-  if (!isUrlAllowed(params.url, params.authAllowHosts)) {
+  if (!isUrlAllowed(params.url, params.policy.authAllowHosts)) {
     return firstAttempt;
   }
 
@@ -124,10 +123,9 @@ async function fetchWithAuthFallback(params: {
       const token = await params.tokenProvider.getAccessToken(scope);
       const authHeaders = new Headers(params.requestInit?.headers);
       authHeaders.set("Authorization", `Bearer ${token}`);
-      const authAttempt = await safeFetch({
+      const authAttempt = await safeFetchWithPolicy({
         url: params.url,
-        allowHosts: params.allowHosts,
-        authorizationAllowHosts: params.authAllowHosts,
+        policy: params.policy,
         fetchFn,
         requestInit: {
           ...params.requestInit,
@@ -171,8 +169,11 @@ export async function downloadMSTeamsAttachments(params: {
   if (list.length === 0) {
     return [];
   }
-  const allowHosts = resolveAllowedHosts(params.allowHosts);
-  const authAllowHosts = resolveAuthAllowedHosts(params.authAllowHosts);
+  const policy = resolveAttachmentFetchPolicy({
+    allowHosts: params.allowHosts,
+    authAllowHosts: params.authAllowHosts,
+  });
+  const allowHosts = policy.allowHosts;
   const ssrfPolicy = resolveMediaSsrfPolicy(allowHosts);
 
   // Download ANY downloadable attachment (not just images)
@@ -249,8 +250,7 @@ export async function downloadMSTeamsAttachments(params: {
             tokenProvider: params.tokenProvider,
             fetchFn: params.fetchFn,
             requestInit: init,
-            allowHosts,
-            authAllowHosts,
+            policy,
           }),
       });
       out.push(media);

extensions/msteams/src/attachments/graph.ts

@@ -3,16 +3,17 @@ import { getMSTeamsRuntime } from "../runtime.js";
 import { downloadMSTeamsAttachments } from "./download.js";
 import { downloadAndStoreMSTeamsRemoteMedia } from "./remote-media.js";
 import {
+  applyAuthorizationHeaderForUrl,
   GRAPH_ROOT,
   inferPlaceholder,
   isRecord,
   isUrlAllowed,
+  type MSTeamsAttachmentFetchPolicy,
   normalizeContentType,
   resolveMediaSsrfPolicy,
+  resolveAttachmentFetchPolicy,
   resolveRequestUrl,
-  resolveAuthAllowedHosts,
-  resolveAllowedHosts,
-  safeFetch,
+  safeFetchWithPolicy,
 } from "./shared.js";
 import type {
   MSTeamsAccessTokenProvider,
@@ -243,9 +244,11 @@ export async function downloadMSTeamsGraphMedia(params: {
   if (!params.messageUrl || !params.tokenProvider) {
     return { media: [] };
   }
-  const allowHosts = resolveAllowedHosts(params.allowHosts);
-  const authAllowHosts = resolveAuthAllowedHosts(params.authAllowHosts);
-  const ssrfPolicy = resolveMediaSsrfPolicy(allowHosts);
+  const policy: MSTeamsAttachmentFetchPolicy = resolveAttachmentFetchPolicy({
+    allowHosts: params.allowHosts,
+    authAllowHosts: params.authAllowHosts,
+  });
+  const ssrfPolicy = resolveMediaSsrfPolicy(policy.allowHosts);
   const messageUrl = params.messageUrl;
   let accessToken: string;
   try {
@@ -291,7 +294,7 @@ export async function downloadMSTeamsGraphMedia(params: {
           try {
             // SharePoint URLs need to be accessed via Graph shares API
             const shareUrl = att.contentUrl!;
-            if (!isUrlAllowed(shareUrl, allowHosts)) {
+            if (!isUrlAllowed(shareUrl, policy.allowHosts)) {
               continue;
             }
             const encodedUrl = Buffer.from(shareUrl).toString("base64url");
@@ -307,15 +310,15 @@ export async function downloadMSTeamsGraphMedia(params: {
               fetchImpl: async (input, init) => {
                 const requestUrl = resolveRequestUrl(input);
                 const headers = new Headers(init?.headers);
-                if (isUrlAllowed(requestUrl, authAllowHosts)) {
-                  headers.set("Authorization", `Bearer ${accessToken}`);
-                } else {
-                  headers.delete("Authorization");
-                }
-                return await safeFetch({
+                applyAuthorizationHeaderForUrl({
+                  headers,
                   url: requestUrl,
-                  allowHosts,
-                  authorizationAllowHosts: authAllowHosts,
+                  authAllowHosts: policy.authAllowHosts,
+                  bearerToken: accessToken,
+                });
+                return await safeFetchWithPolicy({
+                  url: requestUrl,
+                  policy,
                   fetchFn,
                   requestInit: {
                     ...init,
@@ -373,8 +376,8 @@ export async function downloadMSTeamsGraphMedia(params: {
     attachments: filteredAttachments,
     maxBytes: params.maxBytes,
     tokenProvider: params.tokenProvider,
-    allowHosts,
-    authAllowHosts,
+    allowHosts: policy.allowHosts,
+    authAllowHosts: policy.authAllowHosts,
     fetchFn: params.fetchFn,
     preserveFilenames: params.preserveFilenames,
   });

extensions/msteams/src/attachments/shared.test.ts

@@ -1,12 +1,15 @@
 import { describe, expect, it, vi } from "vitest";
 import {
+  applyAuthorizationHeaderForUrl,
   isPrivateOrReservedIP,
   isUrlAllowed,
   resolveAndValidateIP,
+  resolveAttachmentFetchPolicy,
   resolveAllowedHosts,
   resolveAuthAllowedHosts,
   resolveMediaSsrfPolicy,
   safeFetch,
+  safeFetchWithPolicy,
 } from "./shared.js";
 
 const publicResolve = async () => ({ address: "13.107.136.10" });
@@ -34,6 +37,18 @@ describe("msteams attachment allowlists", () => {
     expect(resolveAuthAllowedHosts(["*", "graph.microsoft.com"])).toEqual(["*"]);
   });
 
+  it("resolves a normalized attachment fetch policy", () => {
+    expect(
+      resolveAttachmentFetchPolicy({
+        allowHosts: ["sharepoint.com"],
+        authAllowHosts: ["graph.microsoft.com"],
+      }),
+    ).toEqual({
+      allowHosts: ["sharepoint.com"],
+      authAllowHosts: ["graph.microsoft.com"],
+    });
+  });
+
   it("requires https and host suffix match", () => {
     const allowHosts = resolveAllowedHosts(["sharepoint.com"]);
     expect(isUrlAllowed("https://contoso.sharepoint.com/file.png", allowHosts)).toBe(true);
@@ -294,4 +309,70 @@ describe("safeFetch", () => {
       }),
     ).rejects.toThrow("blocked by allowlist");
   });
+
+  it("strips authorization across redirects outside auth allowlist", async () => {
+    const seenAuth: string[] = [];
+    const fetchMock = vi.fn(async (url: string, init?: RequestInit) => {
+      const auth = new Headers(init?.headers).get("authorization") ?? "";
+      seenAuth.push(`${url}|${auth}`);
+      if (url === "https://teams.sharepoint.com/file.pdf") {
+        return new Response(null, {
+          status: 302,
+          headers: { location: "https://cdn.sharepoint.com/storage/file.pdf" },
+        });
+      }
+      return new Response("ok", { status: 200 });
+    });
+
+    const headers = new Headers({ Authorization: "Bearer secret" });
+    const res = await safeFetch({
+      url: "https://teams.sharepoint.com/file.pdf",
+      allowHosts: ["sharepoint.com"],
+      authorizationAllowHosts: ["graph.microsoft.com"],
+      fetchFn: fetchMock as unknown as typeof fetch,
+      requestInit: { headers },
+      resolveFn: publicResolve,
+    });
+    expect(res.status).toBe(200);
+    expect(seenAuth[0]).toContain("Bearer secret");
+    expect(seenAuth[1]).toMatch(/\|$/);
+  });
+});
+
+describe("attachment fetch auth helpers", () => {
+  it("sets and clears authorization header by auth allowlist", () => {
+    const headers = new Headers();
+    applyAuthorizationHeaderForUrl({
+      headers,
+      url: "https://graph.microsoft.com/v1.0/me",
+      authAllowHosts: ["graph.microsoft.com"],
+      bearerToken: "token-1",
+    });
+    expect(headers.get("authorization")).toBe("Bearer token-1");
+
+    applyAuthorizationHeaderForUrl({
+      headers,
+      url: "https://evil.example.com/collect",
+      authAllowHosts: ["graph.microsoft.com"],
+      bearerToken: "token-1",
+    });
+    expect(headers.get("authorization")).toBeNull();
+  });
+
+  it("safeFetchWithPolicy forwards policy allowlists", async () => {
+    const fetchMock = vi.fn(async (_url: string, _init?: RequestInit) => {
+      return new Response("ok", { status: 200 });
+    });
+    const res = await safeFetchWithPolicy({
+      url: "https://teams.sharepoint.com/file.pdf",
+      policy: resolveAttachmentFetchPolicy({
+        allowHosts: ["sharepoint.com"],
+        authAllowHosts: ["graph.microsoft.com"],
+      }),
+      fetchFn: fetchMock as unknown as typeof fetch,
+      resolveFn: publicResolve,
+    });
+    expect(res.status).toBe(200);
+    expect(fetchMock).toHaveBeenCalledOnce();
+  });
 });

extensions/msteams/src/attachments/shared.ts

@@ -266,10 +266,42 @@ export function resolveAuthAllowedHosts(input?: string[]): string[] {
   return normalizeHostnameSuffixAllowlist(input, DEFAULT_MEDIA_AUTH_HOST_ALLOWLIST);
 }
 
+export type MSTeamsAttachmentFetchPolicy = {
+  allowHosts: string[];
+  authAllowHosts: string[];
+};
+
+export function resolveAttachmentFetchPolicy(params?: {
+  allowHosts?: string[];
+  authAllowHosts?: string[];
+}): MSTeamsAttachmentFetchPolicy {
+  return {
+    allowHosts: resolveAllowedHosts(params?.allowHosts),
+    authAllowHosts: resolveAuthAllowedHosts(params?.authAllowHosts),
+  };
+}
+
 export function isUrlAllowed(url: string, allowlist: string[]): boolean {
   return isHttpsUrlAllowedByHostnameSuffixAllowlist(url, allowlist);
 }
 
+export function applyAuthorizationHeaderForUrl(params: {
+  headers: Headers;
+  url: string;
+  authAllowHosts: string[];
+  bearerToken?: string;
+}): void {
+  if (!params.bearerToken) {
+    params.headers.delete("Authorization");
+    return;
+  }
+  if (isUrlAllowed(params.url, params.authAllowHosts)) {
+    params.headers.set("Authorization", `Bearer ${params.bearerToken}`);
+    return;
+  }
+  params.headers.delete("Authorization");
+}
+
 export function resolveMediaSsrfPolicy(allowHosts: string[]): SsrFPolicy | undefined {
   return buildHostnameAllowlistPolicyFromSuffixAllowlist(allowHosts);
 }
@@ -408,3 +440,20 @@ export async function safeFetch(params: {
 
   throw new Error(`Too many redirects (>${MAX_SAFE_REDIRECTS})`);
 }
+
+export async function safeFetchWithPolicy(params: {
+  url: string;
+  policy: MSTeamsAttachmentFetchPolicy;
+  fetchFn?: typeof fetch;
+  requestInit?: RequestInit;
+  resolveFn?: (hostname: string) => Promise<{ address: string }>;
+}): Promise<Response> {
+  return await safeFetch({
+    url: params.url,
+    allowHosts: params.policy.allowHosts,
+    authorizationAllowHosts: params.policy.authAllowHosts,
+    fetchFn: params.fetchFn,
+    requestInit: params.requestInit,
+    resolveFn: params.resolveFn,
+  });
+}

extensions/msteams/src/messenger.ts

@@ -10,7 +10,7 @@ import {
 } from "openclaw/plugin-sdk";
 import type { MSTeamsAccessTokenProvider } from "./attachments/types.js";
 import type { StoredConversationReference } from "./conversation-store.js";
-import { classifyMSTeamsSendError, isRevokedProxyError } from "./errors.js";
+import { classifyMSTeamsSendError } from "./errors.js";
 import { prepareFileConsentActivity, requiresFileConsent } from "./file-consent-helpers.js";
 import { buildTeamsFileInfoCard } from "./graph-chat.js";
 import {
@@ -20,6 +20,7 @@ import {
 } from "./graph-upload.js";
 import { extractFilename, extractMessageId, getMimeType, isLocalPath } from "./media-helpers.js";
 import { parseMentions } from "./mentions.js";
+import { withRevokedProxyFallback } from "./revoked-context.js";
 import { getMSTeamsRuntime } from "./runtime.js";
 
 /**
@@ -441,34 +442,42 @@ export async function sendMSTeamsMessages(params: {
     }
   };
 
-  const sendMessagesInContext = async (
+  const sendMessageInContext = async (
     ctx: SendContext,
-    batch: MSTeamsRenderedMessage[] = messages,
-    offset = 0,
+    message: MSTeamsRenderedMessage,
+    messageIndex: number,
+  ): Promise<string> => {
+    const response = await sendWithRetry(
+      async () =>
+        await ctx.sendActivity(
+          await buildActivity(
+            message,
+            params.conversationRef,
+            params.tokenProvider,
+            params.sharePointSiteId,
+            params.mediaMaxBytes,
+          ),
+        ),
+      { messageIndex, messageCount: messages.length },
+    );
+    return extractMessageId(response) ?? "unknown";
+  };
+
+  const sendMessageBatchInContext = async (
+    ctx: SendContext,
+    batch: MSTeamsRenderedMessage[],
+    startIndex: number,
   ): Promise<string[]> => {
     const messageIds: string[] = [];
     for (const [idx, message] of batch.entries()) {
-      const response = await sendWithRetry(
-        async () =>
-          await ctx.sendActivity(
-            await buildActivity(
-              message,
-              params.conversationRef,
-              params.tokenProvider,
-              params.sharePointSiteId,
-              params.mediaMaxBytes,
-            ),
-          ),
-        { messageIndex: offset + idx, messageCount: messages.length },
-      );
-      messageIds.push(extractMessageId(response) ?? "unknown");
+      messageIds.push(await sendMessageInContext(ctx, message, startIndex + idx));
     }
     return messageIds;
   };
 
   const sendProactively = async (
-    batch: MSTeamsRenderedMessage[] = messages,
-    offset = 0,
+    batch: MSTeamsRenderedMessage[],
+    startIndex: number,
   ): Promise<string[]> => {
     const baseRef = buildConversationReference(params.conversationRef);
     const proactiveRef: MSTeamsConversationReference = {
@@ -478,7 +487,7 @@ export async function sendMSTeamsMessages(params: {
 
     const messageIds: string[] = [];
     await params.adapter.continueConversation(params.appId, proactiveRef, async (ctx) => {
-      messageIds.push(...(await sendMessagesInContext(ctx, batch, offset)));
+      messageIds.push(...(await sendMessageBatchInContext(ctx, batch, startIndex)));
     });
     return messageIds;
   };
@@ -490,16 +499,21 @@ export async function sendMSTeamsMessages(params: {
     }
     const messageIds: string[] = [];
     for (const [idx, message] of messages.entries()) {
-      try {
-        messageIds.push(...(await sendMessagesInContext(ctx, [message], idx)));
-      } catch (err) {
-        if (!isRevokedProxyError(err)) {
-          throw err;
-        }
-        const remaining = messages.slice(idx);
-        if (remaining.length > 0) {
-          messageIds.push(...(await sendProactively(remaining, idx)));
-        }
+      const result = await withRevokedProxyFallback({
+        run: async () => ({
+          ids: [await sendMessageInContext(ctx, message, idx)],
+          fellBack: false,
+        }),
+        onRevoked: async () => {
+          const remaining = messages.slice(idx);
+          return {
+            ids: remaining.length > 0 ? await sendProactively(remaining, idx) : [],
+            fellBack: true,
+          };
+        },
+      });
+      messageIds.push(...result.ids);
+      if (result.fellBack) {
         return messageIds;
       }
     }

extensions/msteams/src/monitor-handler.file-consent.test.ts

@@ -155,10 +155,7 @@ describe("msteams file consent invoke authz", () => {
       }),
     );
 
-    // Wait for async upload to complete
-    await vi.waitFor(() => {
-      expect(fileConsentMockState.uploadToConsentUrl).toHaveBeenCalledTimes(1);
-    });
+    expect(fileConsentMockState.uploadToConsentUrl).toHaveBeenCalledTimes(1);
 
     expect(fileConsentMockState.uploadToConsentUrl).toHaveBeenCalledWith(
       expect.objectContaining({
@@ -192,12 +189,9 @@ describe("msteams file consent invoke authz", () => {
       }),
     );
 
-    // Wait for async handler to complete
-    await vi.waitFor(() => {
-      expect(sendActivity).toHaveBeenCalledWith(
-        "The file upload request has expired. Please try sending the file again.",
-      );
-    });
+    expect(sendActivity).toHaveBeenCalledWith(
+      "The file upload request has expired. Please try sending the file again.",
+    );
 
     expect(fileConsentMockState.uploadToConsentUrl).not.toHaveBeenCalled();
     expect(getPendingUpload(uploadId)).toBeDefined();

extensions/msteams/src/monitor-handler.ts

@@ -7,6 +7,7 @@ import { createMSTeamsMessageHandler } from "./monitor-handler/message-handler.j
 import type { MSTeamsMonitorLogger } from "./monitor-types.js";
 import { getPendingUpload, removePendingUpload } from "./pending-uploads.js";
 import type { MSTeamsPollStore } from "./polls.js";
+import { withRevokedProxyFallback } from "./revoked-context.js";
 import type { MSTeamsTurnContext } from "./sdk-types.js";
 
 export type MSTeamsAccessTokenProvider = {
@@ -146,10 +147,19 @@ export function registerMSTeamsHandlers<T extends MSTeamsActivityHandler>(
         // Send invoke response IMMEDIATELY to prevent Teams timeout
         await ctx.sendActivity({ type: "invokeResponse", value: { status: 200 } });
 
-        // Handle file upload asynchronously (don't await)
-        handleFileConsentInvoke(ctx, deps.log).catch((err) => {
+        try {
+          await withRevokedProxyFallback({
+            run: async () => await handleFileConsentInvoke(ctx, deps.log),
+            onRevoked: async () => true,
+            onRevokedLog: () => {
+              deps.log.debug?.(
+                "turn context revoked during file consent invoke; skipping delayed response",
+              );
+            },
+          });
+        } catch (err) {
           deps.log.debug?.("file consent handler error", { error: String(err) });
-        });
+        }
         return;
       }
       return originalRun.call(handler, context);

extensions/msteams/src/monitor.lifecycle.test.ts

@@ -6,6 +6,9 @@ import type { MSTeamsPollStore } from "./polls.js";
 
 type FakeServer = EventEmitter & {
   close: (callback?: (err?: Error | null) => void) => void;
+  setTimeout: (msecs: number) => FakeServer;
+  requestTimeout: number;
+  headersTimeout: number;
 };
 
 const expressControl = vi.hoisted(() => ({
@@ -14,6 +17,18 @@ const expressControl = vi.hoisted(() => ({
 
 vi.mock("openclaw/plugin-sdk", () => ({
   DEFAULT_WEBHOOK_MAX_BODY_BYTES: 1024 * 1024,
+  keepHttpServerTaskAlive: vi.fn(
+    async (params: { abortSignal?: AbortSignal; onAbort?: () => Promise<void> | void }) => {
+      await new Promise<void>((resolve) => {
+        if (params.abortSignal?.aborted) {
+          resolve();
+          return;
+        }
+        params.abortSignal?.addEventListener("abort", () => resolve(), { once: true });
+      });
+      await params.onAbort?.();
+    },
+  ),
   mergeAllowlist: (params: { existing?: string[]; additions?: string[] }) =>
     Array.from(new Set([...(params.existing ?? []), ...(params.additions ?? [])])),
   summarizeMapping: vi.fn(),
@@ -31,6 +46,9 @@ vi.mock("express", () => {
     post: vi.fn(),
     listen: vi.fn((_port: number) => {
       const server = new EventEmitter() as FakeServer;
+      server.setTimeout = vi.fn((_msecs: number) => server);
+      server.requestTimeout = 0;
+      server.headersTimeout = 0;
       server.close = (callback?: (err?: Error | null) => void) => {
         queueMicrotask(() => {
           server.emit("close");

extensions/msteams/src/monitor.ts

@@ -2,6 +2,7 @@ import type { Server } from "node:http";
 import type { Request, Response } from "express";
 import {
   DEFAULT_WEBHOOK_MAX_BODY_BYTES,
+  keepHttpServerTaskAlive,
   mergeAllowlist,
   summarizeMapping,
   type OpenClawConfig,
@@ -333,25 +334,12 @@ export async function monitorMSTeamsProvider(
     });
   };
 
-  // Handle abort signal
-  const onAbort = () => {
-    void shutdown();
-  };
-  if (opts.abortSignal) {
-    if (opts.abortSignal.aborted) {
-      onAbort();
-    } else {
-      opts.abortSignal.addEventListener("abort", onAbort, { once: true });
-    }
-  }
-
-  // Keep this task alive until shutdown/close so gateway runtime does not treat startup as exit.
-  await new Promise<void>((resolve) => {
-    httpServer.once("close", () => {
-      resolve();
-    });
+  // Keep this task alive until close so gateway runtime does not treat startup as exit.
+  await keepHttpServerTaskAlive({
+    server: httpServer,
+    abortSignal: opts.abortSignal,
+    onAbort: shutdown,
   });
-  opts.abortSignal?.removeEventListener("abort", onAbort);
 
   return { app: expressApp, shutdown };
 }

extensions/msteams/src/reply-dispatcher.ts

@@ -13,7 +13,6 @@ import {
   classifyMSTeamsSendError,
   formatMSTeamsSendErrorHint,
   formatUnknownError,
-  isRevokedProxyError,
 } from "./errors.js";
 import {
   buildConversationReference,
@@ -22,6 +21,7 @@ import {
   sendMSTeamsMessages,
 } from "./messenger.js";
 import type { MSTeamsMonitorLogger } from "./monitor-types.js";
+import { withRevokedProxyFallback } from "./revoked-context.js";
 import { getMSTeamsRuntime } from "./runtime.js";
 import type { MSTeamsTurnContext } from "./sdk-types.js";
 
@@ -53,23 +53,24 @@ export function createMSTeamsReplyDispatcher(params: {
    * the stored conversation reference so the user still sees the "…" bubble.
    */
   const sendTypingIndicator = async () => {
-    try {
-      await params.context.sendActivity({ type: "typing" });
-    } catch (err) {
-      if (!isRevokedProxyError(err)) {
-        throw err;
-      }
-      // Turn context revoked — fall back to proactive typing.
-      params.log.debug?.("turn context revoked, sending typing via proactive messaging");
-      const baseRef = buildConversationReference(params.conversationRef);
-      await params.adapter.continueConversation(
-        params.appId,
-        { ...baseRef, activityId: undefined },
-        async (ctx) => {
-          await ctx.sendActivity({ type: "typing" });
-        },
-      );
-    }
+    await withRevokedProxyFallback({
+      run: async () => {
+        await params.context.sendActivity({ type: "typing" });
+      },
+      onRevoked: async () => {
+        const baseRef = buildConversationReference(params.conversationRef);
+        await params.adapter.continueConversation(
+          params.appId,
+          { ...baseRef, activityId: undefined },
+          async (ctx) => {
+            await ctx.sendActivity({ type: "typing" });
+          },
+        );
+      },
+      onRevokedLog: () => {
+        params.log.debug?.("turn context revoked, sending typing via proactive messaging");
+      },
+    });
   };
 
   const typingCallbacks = createTypingCallbacks({

extensions/msteams/src/revoked-context.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, it, vi } from "vitest";
+import { withRevokedProxyFallback } from "./revoked-context.js";
+
+describe("msteams revoked context helper", () => {
+  it("returns primary result when no error occurs", async () => {
+    await expect(
+      withRevokedProxyFallback({
+        run: async () => "ok",
+        onRevoked: async () => "fallback",
+      }),
+    ).resolves.toBe("ok");
+  });
+
+  it("uses fallback when proxy-revoked TypeError is thrown", async () => {
+    const onRevokedLog = vi.fn();
+    await expect(
+      withRevokedProxyFallback({
+        run: async () => {
+          throw new TypeError("Cannot perform 'get' on a proxy that has been revoked");
+        },
+        onRevoked: async () => "fallback",
+        onRevokedLog,
+      }),
+    ).resolves.toBe("fallback");
+    expect(onRevokedLog).toHaveBeenCalledOnce();
+  });
+
+  it("rethrows non-revoked errors", async () => {
+    const err = Object.assign(new Error("boom"), { statusCode: 500 });
+    await expect(
+      withRevokedProxyFallback({
+        run: async () => {
+          throw err;
+        },
+        onRevoked: async () => "fallback",
+      }),
+    ).rejects.toBe(err);
+  });
+});

extensions/msteams/src/revoked-context.ts

@@ -0,0 +1,17 @@
+import { isRevokedProxyError } from "./errors.js";
+
+export async function withRevokedProxyFallback<T>(params: {
+  run: () => Promise<T>;
+  onRevoked: () => Promise<T>;
+  onRevokedLog?: () => void;
+}): Promise<T> {
+  try {
+    return await params.run();
+  } catch (err) {
+    if (!isRevokedProxyError(err)) {
+      throw err;
+    }
+    params.onRevokedLog?.();
+    return await params.onRevoked();
+  }
+}

src/plugin-sdk/channel-lifecycle.test.ts

@@ -0,0 +1,66 @@
+import { EventEmitter } from "node:events";
+import { describe, expect, it, vi } from "vitest";
+import { keepHttpServerTaskAlive, waitUntilAbort } from "./channel-lifecycle.js";
+
+type FakeServer = EventEmitter & {
+  close: (callback?: () => void) => void;
+};
+
+function createFakeServer(): FakeServer {
+  const server = new EventEmitter() as FakeServer;
+  server.close = (callback) => {
+    queueMicrotask(() => {
+      server.emit("close");
+      callback?.();
+    });
+  };
+  return server;
+}
+
+describe("plugin-sdk channel lifecycle helpers", () => {
+  it("resolves waitUntilAbort when signal aborts", async () => {
+    const abort = new AbortController();
+    const task = waitUntilAbort(abort.signal);
+
+    const early = await Promise.race([
+      task.then(() => "resolved"),
+      new Promise<"pending">((resolve) => setTimeout(() => resolve("pending"), 25)),
+    ]);
+    expect(early).toBe("pending");
+
+    abort.abort();
+    await expect(task).resolves.toBeUndefined();
+  });
+
+  it("keeps server task pending until close, then resolves", async () => {
+    const server = createFakeServer();
+    const task = keepHttpServerTaskAlive({ server });
+
+    const early = await Promise.race([
+      task.then(() => "resolved"),
+      new Promise<"pending">((resolve) => setTimeout(() => resolve("pending"), 25)),
+    ]);
+    expect(early).toBe("pending");
+
+    server.close();
+    await expect(task).resolves.toBeUndefined();
+  });
+
+  it("triggers abort hook once and resolves after close", async () => {
+    const server = createFakeServer();
+    const abort = new AbortController();
+    const onAbort = vi.fn(async () => {
+      server.close();
+    });
+
+    const task = keepHttpServerTaskAlive({
+      server,
+      abortSignal: abort.signal,
+      onAbort,
+    });
+
+    abort.abort();
+    await expect(task).resolves.toBeUndefined();
+    expect(onAbort).toHaveBeenCalledOnce();
+  });
+});

src/plugin-sdk/channel-lifecycle.ts

@@ -0,0 +1,66 @@
+type CloseAwareServer = {
+  once: (event: "close", listener: () => void) => unknown;
+};
+
+/**
+ * Return a promise that resolves when the signal is aborted.
+ *
+ * If no signal is provided, the promise stays pending forever.
+ */
+export function waitUntilAbort(signal?: AbortSignal): Promise<void> {
+  return new Promise<void>((resolve) => {
+    if (!signal) {
+      return;
+    }
+    if (signal.aborted) {
+      resolve();
+      return;
+    }
+    signal.addEventListener("abort", () => resolve(), { once: true });
+  });
+}
+
+/**
+ * Keep a channel/provider task pending until the HTTP server closes.
+ *
+ * When an abort signal is provided, `onAbort` is invoked once and should
+ * trigger server shutdown. The returned promise resolves only after `close`.
+ */
+export async function keepHttpServerTaskAlive(params: {
+  server: CloseAwareServer;
+  abortSignal?: AbortSignal;
+  onAbort?: () => void | Promise<void>;
+}): Promise<void> {
+  const { server, abortSignal, onAbort } = params;
+  let abortTask: Promise<void> = Promise.resolve();
+  let abortTriggered = false;
+
+  const triggerAbort = () => {
+    if (abortTriggered) {
+      return;
+    }
+    abortTriggered = true;
+    abortTask = Promise.resolve(onAbort?.()).then(() => undefined);
+  };
+
+  const onAbortSignal = () => {
+    triggerAbort();
+  };
+
+  if (abortSignal) {
+    if (abortSignal.aborted) {
+      triggerAbort();
+    } else {
+      abortSignal.addEventListener("abort", onAbortSignal, { once: true });
+    }
+  }
+
+  await new Promise<void>((resolve) => {
+    server.once("close", () => resolve());
+  });
+
+  if (abortSignal) {
+    abortSignal.removeEventListener("abort", onAbortSignal);
+  }
+  await abortTask;
+}

src/plugin-sdk/index.ts

@@ -149,6 +149,7 @@ export {
   WEBHOOK_IN_FLIGHT_DEFAULTS,
 } from "./webhook-request-guards.js";
 export type { WebhookBodyReadProfile, WebhookInFlightLimiter } from "./webhook-request-guards.js";
+export { keepHttpServerTaskAlive, waitUntilAbort } from "./channel-lifecycle.js";
 export type { AgentMediaPayload } from "./agent-media-payload.js";
 export { buildAgentMediaPayload } from "./agent-media-payload.js";
 export {