/
index.go
124 lines (106 loc) · 2.4 KB
/
index.go
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package sakescript
import (
"archive/zip"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"sort"
"strings"
)
func ZipIndexer(stripPrefix, path string) ([]IndexEntry, error) {
var index []IndexEntry
err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() && strings.HasSuffix(path, ".zip") {
manifest, err := extractFile(path, "manifest.json")
if err != nil {
return err
}
if manifest != nil {
hash, err := computeHash(path)
if err != nil {
return err
}
relativePath, err := filepath.Rel(stripPrefix, path)
if err != nil {
return err
}
index = append(index, IndexEntry{Path: relativePath, Sha256: hash, Manifest: *manifest})
}
}
return nil
})
if err != nil {
return nil, err
}
// ensure index is at least []
if index == nil {
index = []IndexEntry{}
}
return index, nil
}
// Sort sort index by created date desc
func SortIndex(index []IndexEntry) {
sort.Slice(index, func(i, j int) bool {
return index[i].Manifest.Created > index[j].Manifest.Created
})
}
func WriteIndex(index []IndexEntry, stripPrefix, output string) error {
for i := range index {
index[i].Path = strings.TrimPrefix(index[i].Path, stripPrefix)
index[i].Path = strings.TrimPrefix(index[i].Path, "/")
}
indexData, err := json.MarshalIndent(index, "", " ")
if err != nil {
return err
}
err = os.WriteFile(output, indexData, 0644)
if err != nil {
return err
}
return nil
}
func extractFile(zipPath, filename string) (*Manifest, error) {
r, err := zip.OpenReader(zipPath)
if err != nil {
return nil, err
}
defer r.Close()
for _, f := range r.File {
if f.Name == filename {
rc, err := f.Open()
if err != nil {
return nil, err
}
defer rc.Close()
manifestData, err := io.ReadAll(rc)
if err != nil {
return nil, err
}
var manifest Manifest
if err := json.Unmarshal(manifestData, &manifest); err != nil {
return nil, err
}
return &manifest, nil
}
}
return nil, fmt.Errorf("file %s not found in %s", filename, zipPath)
}
func computeHash(zipPath string) (string, error) {
file, err := os.Open(zipPath)
if err != nil {
return "", err
}
defer file.Close()
hasher := sha256.New()
if _, err := io.Copy(hasher, file); err != nil {
return "", err
}
return hex.EncodeToString(hasher.Sum(nil)), nil
}