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package fs
import (
"mime"
"os"
"strings"
"unicode/utf8"
)
func mediaType(filePath string) string {
if strings.HasSuffix(filePath, ".gmi") {
// This may not be present in the listings searched by mime.TypeByExtension,
// so provide a dedicated fast path for it here.
return "text/gemini"
}
slashIdx := strings.LastIndex(filePath, "/")
dotIdx := strings.LastIndex(filePath[slashIdx+1:], ".")
if dotIdx == -1 {
return "application/octet-stream"
}
ext := filePath[slashIdx+1+dotIdx:]
mtype := mime.TypeByExtension(ext)
if mtype == "" {
if contentsAreText(filePath) {
return "text/plain"
}
return "application/octet-stream"
}
return mtype
}
func isPrivate(fullpath string) bool {
for _, segment := range strings.Split(fullpath, "/") {
if len(segment) > 1 && segment[0] == '.' {
return true
}
}
return false
}
func contentsAreText(filepath string) bool {
f, err := os.Open(filepath)
if err != nil {
return false
}
defer func() { _ = f.Close() }()
var buf [1024]byte
n, err := f.Read(buf[:])
if err != nil {
return false
}
for i, c := range string(buf[:n]) {
if i+utf8.UTFMax > n {
// incomplete last char
break
}
if c == 0xFFFD || c < ' ' && c != '\n' && c != '\t' && c != '\f' {
return false
}
}
return true
}
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