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installer.go
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installer.go
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package core
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/md5"
"encoding/json"
"errors"
"fmt"
"github.com/klauspost/compress/zstd"
"github.com/smarty/satisfy/contracts"
"github.com/smarty/satisfy/shell"
"io"
"log"
"net/url"
"os"
"path/filepath"
"strings"
)
// Compile-time check of interface implementations.
var _ contracts.DownloadSetter = (*shell.ZipArchiveReader)(nil)
type PackageInstallerFileSystem interface {
contracts.FileCreator
contracts.FileWriter
contracts.Deleter
contracts.SymlinkCreator
contracts.Chmod
}
type PackageInstaller struct {
downloader contracts.Downloader
filesystem PackageInstallerFileSystem
showProgress bool
}
func NewPackageInstaller(downloader contracts.Downloader, filesystem PackageInstallerFileSystem, showProgress bool) *PackageInstaller {
return &PackageInstaller{downloader: downloader, filesystem: filesystem, showProgress: showProgress}
}
func (this *PackageInstaller) DownloadManifest(remoteAddress url.URL) (manifest contracts.Manifest, err error) {
body, err := this.downloader.Download(remoteAddress)
if err != nil {
return contracts.Manifest{}, err
}
defer closeResource(body)
rawManifest, err := io.ReadAll(body)
err = json.Unmarshal(rawManifest, &manifest)
return manifest, err
}
func (this *PackageInstaller) InstallManifest(request contracts.InstallationRequest) (manifest contracts.Manifest, err error) {
manifest, err = this.DownloadManifest(request.RemoteAddress)
if err != nil {
return contracts.Manifest{}, err
}
manifest.Name = request.PackageName
rawManifest, err := json.MarshalIndent(manifest, "", " ")
if err != nil {
return contracts.Manifest{}, err
}
this.filesystem.WriteFile(ComposeManifestPath(request.LocalPath, manifest.Name), rawManifest)
return manifest, nil
}
func (this *PackageInstaller) InstallPackage(manifest contracts.Manifest, request contracts.InstallationRequest) error {
body, err := this.downloader.Download(request.RemoteAddress)
if err != nil {
return err
}
defer closeResource(body)
checksumReader := NewHashReader(body, md5.New())
factory, found := decompressors[manifest.Archive.CompressionAlgorithm]
if !found {
return errors.New("invalid compression algorithm")
}
decompressor, err := factory(checksumReader)
if err != nil {
return err
}
paths, err := this.extractArchive(decompressor, request, len(manifest.Archive.Contents))
if err != nil {
this.revertFileSystem(paths)
return err
}
actualChecksum := checksumReader.Sum(nil)
if bytes.Compare(actualChecksum, manifest.Archive.MD5Checksum) != 0 {
this.revertFileSystem(paths)
return fmt.Errorf("checksum mismatch: actual [%x] != expected [%x]", actualChecksum, manifest.Archive.MD5Checksum)
}
return nil
}
func (this *PackageInstaller) extractArchive(decompressor io.ReadCloser, request contracts.InstallationRequest, itemCount int) (paths []string, err error) {
defer closeResource(decompressor)
var reader ArchiveReader
if archiveReader, ok := decompressor.(ArchiveReader); ok {
reader = archiveReader
} else {
reader = archiveFormats[""](decompressor)
}
if _, ok := reader.(contracts.DownloadSetter); ok {
reader.(contracts.DownloadSetter).SetDownloader(request.RemoteAddress, this.downloader)
}
for i := 0; ; i++ {
header, err := reader.Next()
if err == io.EOF {
break
}
if err != nil {
return paths, err
}
pathItem := filepath.Join(request.LocalPath, header.Name)
paths = append(paths, pathItem)
log.Printf("Extracting archive item [%d/%d] \"%s\" [%s] to \"%s\".",
i+1, itemCount, header.Name, byteCountToString(header.Size), pathItem)
if header.Typeflag == tar.TypeSymlink {
this.filesystem.CreateSymlink(header.Linkname, pathItem)
} else {
writer := this.filesystem.Create(pathItem)
progressReader := newArchiveProgressCounter(header.Size, func(archived, total string, done bool) {
if this.showProgress {
if done {
fmt.Printf("\nDone extracting %s.\n", archived)
} else {
fmt.Printf("\033[2K\rExtracted %s of %s.", archived, total)
}
}
})
multiWriter := io.MultiWriter(writer, progressReader)
_, err = io.Copy(multiWriter, reader)
_ = writer.Close()
_ = progressReader.Close()
if err != nil {
return paths, err
}
if !contracts.IsExecutable(os.FileMode(header.Mode)) {
continue
}
err := this.filesystem.Chmod(pathItem, 0755)
if err != nil {
return paths, err
}
}
}
return paths, nil
}
func byteCountToString(size int64) string {
if size < 1 {
return "? bytes"
}
const unit = 1024
if size < unit {
return fmt.Sprintf("%d bytes", size)
}
div, exp := int64(unit), 0
for i := size / unit; i >= unit; i /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %ciB", float64(size)/float64(div), "KMGTPE"[exp])
}
func (this *PackageInstaller) revertFileSystem(paths []string) {
for _, path := range paths {
this.filesystem.Delete(path)
}
}
func ComposeManifestPath(localPath, packageName string) string {
cleanPackageName := strings.ReplaceAll(packageName, "/", "___")
fileName := fmt.Sprintf("manifest_%s.json", cleanPackageName)
return filepath.Join(localPath, fileName)
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
var decompressors = map[string]func(_ io.Reader) (io.ReadCloser, error){
"zstd": newZStdReader,
"zip": newZipReader,
"gzip": newGZipReader,
}
func newZStdReader(source io.Reader) (io.ReadCloser, error) {
if reader, err := zstd.NewReader(source); err != nil {
return nil, err
} else {
return reader.IOReadCloser(), nil
}
}
func newZipReader(source io.Reader) (io.ReadCloser, error) {
return shell.NewZipArchiveReader(source).(io.ReadCloser), nil
}
func newGZipReader(source io.Reader) (io.ReadCloser, error) {
return gzip.NewReader(source)
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type ArchiveReader interface {
Next() (*tar.Header, error)
io.Reader
}
var archiveFormats = map[string]func(reader io.Reader) ArchiveReader{
"": func(reader io.Reader) ArchiveReader { return tar.NewReader(reader) },
}
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type DownloadSetter interface {
SetDownloader(url.URL, contracts.Downloader)
}
func closeResource(closer io.Closer) {
if closer != nil {
_ = closer.Close()
}
}