add text/plain support ?

[Valdenir Luíz Mezadri Junior]

can you add this?

i try use AddMatcher but not work

my code:

var txtType = filetype.NewType("txt", "text/plain")

func txtMatcher(buf []byte) bool {
return len(buf) > 1 && buf[0] == 0x01 && buf[1] == 0x02
}

filetype.AddMatcher(txtType, txtMatcher)

// Check if the new type is supported by extension
if filetype.IsSupported("txt") {
	fmt.Println("New supported type: txt")
}

// Check if the new type is supported by MIME
if filetype.IsMIMESupported("text/plain") {
	fmt.Println("New supported MIME type: text/plain")
}

head := make([]byte, 261)
f, _ := file.Open()
f.Read(head)
kind, _ := filetype.Match(head)
if kind == filetype.Unknown {
	fmt.Println("Unknown file type")
	fmt.Println(kind)
	fmt.Println(head)
	return errors.New("Este arquivo não é permitido")
} else {
	fmt.Printf("File type matched: %s\n", kind.Extension)
}

[Mateus Maia]

The main problem is because there's no Magic Bytes for .txt, the same "problem" happens with csv, so there's no way to use this kind of validation.

You can implement some outside function to deal with this validation just checking the extension.