S3 backend for storage service (#1629)

Co-authored-by: Alok Kumar <rajalokan@gmail.com>

pkg/storagesvc/s3storage.go

@@ -0,0 +1,67 @@
+package storagesvc
+
+import (
+	"os"
+	"path"
+
+	"github.com/graymeta/stow"
+	"github.com/graymeta/stow/s3"
+	uuid "github.com/satori/go.uuid"
+)
+
+type (
+	s3Storage struct {
+		storageType     StorageType
+		endpoint        string
+		bucketName      string
+		subDir          string
+		accessKeyID     string
+		secretAccessKey string
+		region          string
+	}
+)
+
+// NewS3Storage returns a new s3 storage struct
+func NewS3Storage(args ...string) Storage {
+	endpoint := os.Getenv("STORAGE_S3_ENDPOINT")
+	bucketName := os.Getenv("STORAGE_S3_BUCKET_NAME")
+	subDir := os.Getenv("STORAGE_S3_SUB_DIR")
+	accessKeyID := os.Getenv("STORAGE_S3_ACCESS_KEY_ID")
+	secretAccessKey := os.Getenv("STORAGE_S3_SECRET_ACCESS_KEY")
+	region := os.Getenv("STORAGE_S3_REGION")
+
+	return s3Storage{
+		endpoint:        endpoint,
+		storageType:     StorageTypeS3,
+		bucketName:      bucketName,
+		subDir:          subDir,
+		accessKeyID:     accessKeyID,
+		secretAccessKey: secretAccessKey,
+		region:          region,
+	}
+}
+
+func (ss s3Storage) getStorageType() StorageType {
+	return ss.storageType
+}
+
+func (ss s3Storage) getContainerName() string {
+	return ss.bucketName
+}
+
+func (ss s3Storage) getUploadFileName() string {
+	uploadName := uuid.NewV4().String()
+	return path.Join(ss.subDir, uploadName)
+}
+
+func (ss s3Storage) dial() (stow.Location, error) {
+	kind := "s3"
+	config := stow.ConfigMap{
+		s3.ConfigEndpoint:    ss.endpoint,
+		s3.ConfigAccessKeyID: ss.accessKeyID,
+		s3.ConfigSecretKey:   ss.secretAccessKey,
+		s3.ConfigRegion:      ss.region,
+		s3.ConfigDisableSSL:  "true",
+	}
+	return stow.Dial(kind, config)
+}