photoprism/internal/util/mime.go

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package util
import (
"net/http"
"os"
)
func MimeType(filename string) string {
handle, err := os.Open(filename)
if err != nil {
log.Error(err.Error())
return ""
}
defer handle.Close()
// Only the first 512 bytes are used to sniff the content type.
buffer := make([]byte, 512)
_, err = handle.Read(buffer)
if err != nil {
log.Errorf("could not read file to determine mime type: %s", filename)
return ""
}
return http.DetectContentType(buffer)
}