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fschecksum.go
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/
fschecksum.go
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package utils
import (
"crypto/md5"
"encoding/hex"
"fmt"
"os"
"path"
"sort"
)
func CalculateStringsChecksum(stringArr ...string) string {
hasher := md5.New()
sort.Strings(stringArr)
for _, value := range stringArr {
_, _ = hasher.Write([]byte(value))
}
return hex.EncodeToString(hasher.Sum(nil))
}
func CalculateChecksumOfFile(path string) (string, error) {
content, err := os.ReadFile(path)
if err != nil {
return "", err
}
return CalculateStringsChecksum(string(content)), nil
}
func CalculateChecksumOfDirectory(dir string) (string, error) {
res := ""
var checkErr error
files, err := FilesFromRoot(dir, func(dir string, name string, info os.FileInfo) bool {
fPath := path.Join(dir, name)
checksum, err := CalculateChecksumOfFile(fPath)
if err != nil {
// return only bad files for logging
checkErr = err
return true
}
res = CalculateStringsChecksum(res, checksum)
// good files are skipped
return false
})
if err != nil {
return "", err
}
if checkErr != nil {
return "", fmt.Errorf("calculate checksum of %+v: %v", files, err)
}
return res, nil
}
func CalculateChecksumOfPaths(paths ...string) (string, error) {
res := ""
for _, aPath := range paths {
fileInfo, err := os.Stat(aPath)
if err != nil {
return "", err
}
var checksum string
if fileInfo.IsDir() {
checksum, err = CalculateChecksumOfDirectory(aPath)
} else {
checksum, err = CalculateChecksumOfFile(aPath)
}
if err != nil {
return "", err
}
res = CalculateStringsChecksum(res, checksum)
}
return res, nil
}