fix(feishu): recover mojibake filenames from Content-Disposition (#72388)

CHANGELOG.md

@@ -12,6 +12,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Memory/Dreaming: retry Dream Diary once with the session default when a configured dreaming model is unavailable, while leaving subagent trust and allowlist errors visible instead of silently masking configuration problems. Refs #67409 and #69209. Thanks @Ghiggins18 and @everySympathy.
+- Feishu/inbound files: recover CJK filenames from plain `Content-Disposition: filename=` download headers when Feishu exposes UTF-8 bytes through Latin-1 header decoding, while leaving valid Latin-1 and JSON-derived names unchanged. (#48578, #50435, #59431) Thanks @alex-xuweilong, @lishuaigit, and @DoChaoing.
 
 ## 2026.4.27
 

extensions/feishu/src/media.test.ts

@@ -716,4 +716,60 @@ describe("downloadMessageResourceFeishu", () => {
       fileName: "clip.mp4",
     });
   });
+
+  it("recovers CJK filenames from plain Content-Disposition headers decoded as Latin-1", async () => {
+    const fileName = "武汉15座山登山信息汇总.csv";
+    const latin1HeaderFileName = Buffer.from(fileName, "utf8").toString("latin1");
+    messageResourceGetMock.mockResolvedValueOnce({
+      data: Buffer.from("fake-file-data"),
+      headers: {
+        "content-disposition": `attachment; filename="${latin1HeaderFileName}"`,
+      },
+    });
+
+    const result = await downloadMessageResourceFeishu({
+      cfg: emptyConfig,
+      messageId: "om_file_msg",
+      fileKey: "file_key_csv",
+      type: "file",
+    });
+
+    expect(result.fileName).toBe(fileName);
+  });
+
+  it("keeps valid Latin-1 filenames from plain Content-Disposition headers unchanged", async () => {
+    messageResourceGetMock.mockResolvedValueOnce({
+      data: Buffer.from("fake-file-data"),
+      headers: {
+        "content-disposition": `attachment; filename="café-©.txt"`,
+      },
+    });
+
+    const result = await downloadMessageResourceFeishu({
+      cfg: emptyConfig,
+      messageId: "om_latin1_msg",
+      fileKey: "file_key_latin1",
+      type: "file",
+    });
+
+    expect(result.fileName).toBe("café-©.txt");
+  });
+
+  it("keeps JSON-derived file_name metadata unchanged", async () => {
+    const fileName = "武汉15座山登山信息汇总.csv";
+    const latin1LookingFileName = Buffer.from(fileName, "utf8").toString("latin1");
+    messageResourceGetMock.mockResolvedValueOnce({
+      data: Buffer.from("fake-file-data"),
+      file_name: latin1LookingFileName,
+    });
+
+    const result = await downloadMessageResourceFeishu({
+      cfg: emptyConfig,
+      messageId: "om_json_file_msg",
+      fileKey: "file_key_json",
+      type: "file",
+    });
+
+    expect(result.fileName).toBe(latin1LookingFileName);
+  });
 });

extensions/feishu/src/media.ts

@@ -146,6 +146,18 @@ function readHeaderValue(
   return undefined;
 }
 
+function containsEastAsianScript(value: string): boolean {
+  return /[\p{Script=Han}\p{Script=Hiragana}\p{Script=Katakana}\p{Script=Hangul}]/u.test(value);
+}
+
+function recoverUtf8FileNameFromLatin1Header(value: string): string {
+  const recovered = Buffer.from(value, "latin1").toString("utf8");
+  if (recovered !== value && !recovered.includes("\uFFFD") && containsEastAsianScript(recovered)) {
+    return recovered;
+  }
+  return value;
+}
+
 function decodeDispositionFileName(value: string): string | undefined {
   const utf8Match = value.match(/filename\*=UTF-8''([^;]+)/i);
   if (utf8Match?.[1]) {
@@ -157,7 +169,8 @@ function decodeDispositionFileName(value: string): string | undefined {
   }
 
   const plainMatch = value.match(/filename="?([^";]+)"?/i);
-  return plainMatch?.[1]?.trim();
+  const plainFileName = plainMatch?.[1]?.trim();
+  return plainFileName ? recoverUtf8FileNameFromLatin1Header(plainFileName) : undefined;
 }
 
 function extractFeishuDownloadMetadata(response: FeishuDownloadResponse): {