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fix(line): land #31151 M4A voice MIME detection (@scoootscooob)

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Landed from contributor PR #31151 by @scoootscooob.

Co-authored-by: scoootscooob <scoootscooob@users.noreply.github.com>
This commit is contained in:
Peter Steinberger
2026-03-02 02:26:41 +00:00
parent a1a8ec6870
commit 1da7906a5d
3 changed files with 63 additions and 7 deletions
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50
src/line/download.test.ts
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@@ -66,4 +66,54 @@ describe("downloadLineMedia", () => {
await expect(downloadLineMedia("mid", "token", 7)).rejects.toThrow(/Media exceeds/i);
expect(writeSpy).not.toHaveBeenCalled();
});
it("detects M4A audio from ftyp major brand (#29751)", async () => {
// Real M4A magic bytes: size(4) + "ftyp" + "M4A "
const m4a = Buffer.from([
0x00,
0x00,
0x00,
0x1c, // box size
0x66,
0x74,
0x79,
0x70, // "ftyp"
0x4d,
0x34,
0x41,
0x20, // "M4A " major brand
]);
getMessageContentMock.mockResolvedValueOnce(chunks([m4a]));
vi.spyOn(fs.promises, "writeFile").mockResolvedValueOnce(undefined);
const result = await downloadLineMedia("mid-m4a", "token");
expect(result.contentType).toBe("audio/mp4");
expect(result.path).toMatch(/\.m4a$/);
});
it("detects MP4 video from ftyp major brand (isom)", async () => {
// MP4 video magic bytes: size(4) + "ftyp" + "isom"
const mp4 = Buffer.from([
0x00,
0x00,
0x00,
0x1c,
0x66,
0x74,
0x79,
0x70,
0x69,
0x73,
0x6f,
0x6d, // "isom" major brand
]);
getMessageContentMock.mockResolvedValueOnce(chunks([mp4]));
vi.spyOn(fs.promises, "writeFile").mockResolvedValueOnce(undefined);
const result = await downloadLineMedia("mid-mp4", "token");
expect(result.contentType).toBe("video/mp4");
expect(result.path).toMatch(/\.mp4$/);
});
});