filebrowser/checksum.go

51 lines
890 B
Go

package filemanager
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
e "errors"
"hash"
"io"
"net/http"
"os"
)
// checksum calculates the hash of a file. Supports MD5, SHA1, SHA256 and SHA512.
func checksum(w http.ResponseWriter, r *http.Request, i *fileInfo) (int, error) {
query := r.URL.Query().Get("checksum")
file, err := os.Open(i.Path)
if err != nil {
return errorToHTTP(err, true), err
}
defer file.Close()
var h hash.Hash
switch query {
case "md5":
h = md5.New()
case "sha1":
h = sha1.New()
case "sha256":
h = sha256.New()
case "sha512":
h = sha512.New()
default:
return http.StatusBadRequest, e.New("Unknown HASH type")
}
_, err = io.Copy(h, file)
if err != nil {
return http.StatusInternalServerError, err
}
val := hex.EncodeToString(h.Sum(nil))
w.Write([]byte(val))
return http.StatusOK, nil
}