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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "crypto/md5" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| type Checksums struct { | ||
| filename string | ||
| baseDirectory string | ||
| checksums map[string]string | ||
| loaded bool | ||
| } | ||
|
|
||
| func NewChecksums(filename, baseDirectory string) *Checksums { | ||
| return &Checksums{filename: filename, baseDirectory: baseDirectory, checksums: map[string]string{}} | ||
| } | ||
|
|
||
| func (checksums *Checksums) GetChecksum(targetFilename string) (result string, error error) { | ||
| relativeFilename := targetFilename[len(checksums.baseDirectory):] | ||
|
|
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| _ = checksums.load() | ||
|
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| checksumsCache, _errorCache := os.Stat(checksums.filename) | ||
| checksumsTarget, _errorTarget := os.Stat(targetFilename) | ||
|
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| if _errorCache == nil && _errorTarget == nil && checksumsTarget.ModTime().Before(checksumsCache.ModTime()) { | ||
| if checksum, ok := checksums.checksums[relativeFilename]; ok { | ||
| return checksum, nil | ||
| } | ||
| } | ||
|
|
||
| file, error := os.Open(targetFilename) | ||
|
|
||
| if error != nil { | ||
| return | ||
| } | ||
|
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| defer file.Close() | ||
|
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| hash := md5.New() | ||
|
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| if _, error = io.Copy(hash, file); error != nil { | ||
| return | ||
| } | ||
|
|
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| result = hex.EncodeToString(hash.Sum(nil)[:16]) | ||
|
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| checksums.checksums[relativeFilename] = result | ||
|
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| _ = checksums.save() | ||
|
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| return | ||
| } | ||
|
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| func (checksums *Checksums) save() error { | ||
| buffer := "" | ||
|
|
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| for filename, value := range checksums.checksums { | ||
| buffer += fmt.Sprintf("%s %s\n", value, filename) | ||
| } | ||
|
|
||
| if _error := ioutil.WriteFile(checksums.filename, []byte(buffer), 0644); _error != nil { | ||
| return errors.Wrapf(_error, "Could not write to %s", checksums.filename) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
|
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| func (checksums *Checksums) load() error { | ||
| if checksums.loaded { | ||
| return nil | ||
| } | ||
|
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| checksums.loaded = true | ||
|
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| content, _error := ioutil.ReadFile(checksums.filename) | ||
| if _error != nil { | ||
| return _error | ||
| } | ||
|
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| lines := strings.Split(string(content), "\n") | ||
|
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| for _, line := range lines { | ||
| if len(line) < 35 { | ||
| continue | ||
| } | ||
|
|
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| filename := line[33:] | ||
| checksum := line[:32] | ||
|
|
||
| checksums.checksums[filename] = checksum | ||
| } | ||
|
|
||
| return nil | ||
| } |
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