feat(assets): calculate checksum for all assets and upload it

internal/assets/asset.go

@@ -0,0 +1,160 @@
+package assets
+
+import (
+	"archive/zip"
+	"crypto/md5"
+	"crypto/sha1"
+	"crypto/sha256"
+	"crypto/sha512"
+	"encoding/hex"
+	"hash"
+	"hash/crc32"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/Nightapes/go-semantic-release/pkg/config"
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+)
+
+// Asset struct
+type Asset struct {
+	name         string
+	path         string
+	algorithm    string
+	isCompressed bool
+}
+
+//NewAsset from a config
+func NewAsset(repository string, assetConfig config.Asset, algorithm string) (*Asset, error) {
+
+	filePath := assetConfig.Path
+	if assetConfig.Name != "" && assetConfig.Path == "" {
+		filePath = assetConfig.Name
+		log.Warn("Name is deprecated. Please update your config. See https://nightapes.github.io/go-semantic-release/")
+	}
+
+	realPath := path.Join(repository, filePath)
+
+	file, err := os.Open(realPath)
+	if err != nil {
+		file.Close()
+		return nil, errors.Wrapf(err, "Could not open file %s", realPath)
+	}
+	defer file.Close()
+
+	name := assetConfig.Rename
+	if assetConfig.Rename == "" {
+		info, _ := file.Stat()
+		name = info.Name()
+	}
+
+	asset := &Asset{
+		path:         realPath,
+		name:         name,
+		isCompressed: assetConfig.Compress,
+		algorithm:    algorithm,
+	}
+
+	return asset, nil
+}
+
+func (a *Asset) getChecksum() (string, error) {
+	log.Debugf("Calculating checksum for %s", a.path)
+	file, err := os.Open(a.path)
+	if err != nil {
+		return "", errors.Wrapf(err, "Failed to open file %s to calculate checksum", a.name)
+	}
+	defer file.Close() // nolint: errcheck
+	var hash hash.Hash
+	switch a.algorithm {
+	case "crc32":
+		hash = crc32.NewIEEE()
+	case "md5":
+		hash = md5.New()
+	case "sha1":
+		hash = sha1.New()
+	case "sha224":
+		hash = sha256.New224()
+	case "sha384":
+		hash = sha512.New384()
+	case "sha256":
+		hash = sha256.New()
+	case "sha512":
+		hash = sha512.New()
+	default:
+		hash = sha256.New()
+	}
+	_, err = io.Copy(hash, file)
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(hash.Sum(nil)), nil
+}
+
+// GetPath where the file is located, if zipped true, it will compress it and give you the new location
+func (a *Asset) GetPath() (string, error) {
+	if a.isCompressed {
+		return a.zipFile()
+	}
+	return a.path, nil
+}
+
+// GetName of asset
+func (a *Asset) GetName() string {
+	return a.name
+}
+
+// IsCompressed return true if file was zipped
+func (a *Asset) IsCompressed() bool {
+	return a.isCompressed
+}
+
+// ZipFile compress given file in zip format
+func (a *Asset) zipFile() (string, error) {
+
+	path := a.path
+	fileToZip, err := os.Open(path)
+	if err != nil {
+		return "", errors.Wrapf(err, "Could not open file %s", path)
+	}
+	defer fileToZip.Close()
+
+	zipFile, err := ioutil.TempFile(os.TempDir(), "asset.*.zip")
+
+	if err != nil {
+		return "", errors.Wrap(err, "Could not generate tmp file")
+	}
+	log.Debugf("Created zipfile %s", zipFile.Name())
+
+	fileToZipInfo, err := fileToZip.Stat()
+	if err != nil {
+		return "", errors.Wrap(err, "Could not read file infos")
+	}
+
+	zipWriter := zip.NewWriter(zipFile)
+	defer zipWriter.Close()
+
+	fileToZipHeader, err := zip.FileInfoHeader(fileToZipInfo)
+	if err != nil {
+		return "", errors.Wrap(err, "Could not add file infos to zip handler")
+	}
+
+	fileToZipHeader.Name = fileToZipInfo.Name()
+
+	fileToZipWriter, err := zipWriter.CreateHeader(fileToZipHeader)
+	if err != nil {
+		return "", errors.Wrap(err, "Could not create zip header")
+	}
+
+	if _, err = io.Copy(fileToZipWriter, fileToZip); err != nil {
+		return "", errors.Wrap(err, "Could not zip file")
+	}
+	if err := zipFile.Close(); err != nil {
+		return "", errors.Wrap(err, "Could not close file")
+	}
+	return filepath.Abs(fileToZipInfo.Name())
+}