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Do not recognize text files as audio (#23355) #23368

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Merged
merged 1 commit into from
Mar 8, 2023
Merged

Do not recognize text files as audio (#23355) #23368

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10 changes: 10 additions & 0 deletions modules/typesniffer/typesniffer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,16 @@ func DetectContentType(data []byte) SniffedType {
}
}

if strings.HasPrefix(ct, "audio/") && bytes.HasPrefix(data, []byte("ID3")) {
// The MP3 detection is quite inaccurate, any content with "ID3" prefix will result in "audio/mpeg".
// So remove the "ID3" prefix and detect again, if result is text, then it must be text content.
// This works especially because audio files contain many unprintable/invalid characters like `0x00`
ct2 := http.DetectContentType(data[3:])
if strings.HasPrefix(ct2, "text/") {
ct = ct2
}
}

return SniffedType{ct}
}

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4 changes: 4 additions & 0 deletions modules/typesniffer/typesniffer_test.go
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Expand Up @@ -109,6 +109,10 @@ func TestIsAudio(t *testing.T) {
mp3, _ := base64.StdEncoding.DecodeString("SUQzBAAAAAABAFRYWFgAAAASAAADbWFqb3JfYnJhbmQAbXA0MgBUWFhYAAAAEQAAA21pbm9yX3Zl")
assert.True(t, DetectContentType(mp3).IsAudio())
assert.False(t, DetectContentType([]byte("plain text")).IsAudio())

assert.True(t, DetectContentType([]byte("ID3Toy\000")).IsAudio())
assert.True(t, DetectContentType([]byte("ID3Toy\n====\t* hi 🌞, ...")).IsText()) // test ID3 tag for plain text
assert.True(t, DetectContentType([]byte("ID3Toy\n====\t* hi 🌞, ..."+"🌛"[0:2])).IsText()) // test ID3 tag with incomplete UTF8 char
}

func TestDetectContentTypeFromReader(t *testing.T) {
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