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Do not recognize text files as audio (#23355)

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Close #17108

This PR uses a trick (removing the ID3 tag) to detect the content again
to to see whether the content is text type.

---------

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang 2023-03-08 11:40:41 +08:00 • committed by GitHub
parent b70c7f8660
commit 7e3b7c2346
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2 changed files with 14 additions and 0 deletions
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10
modules/typesniffer/typesniffer.go
View file

@ -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}
}

4
modules/typesniffer/typesniffer_test.go
View file

@ -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) {