Provide ETag with sha256Sum of input object data

pkg/storage/storage.go

@@ -18,10 +18,13 @@ package storage
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"log"
 	"strings"
 	"time"
+
+	"crypto/sha256"
 )
 
 type Storage struct {
@@ -49,6 +52,7 @@ type ObjectMetadata struct {
 	Key        string
 	SecCreated int64
 	Size       int
+	ETag       string
 }
 
 func isValidBucket(bucket string) bool {
@@ -108,10 +112,13 @@ func (storage *Storage) StoreObject(bucket string, key string, data io.Reader) e
 	var bytesBuffer bytes.Buffer
 	newObject := storedObject{}
 	if _, ok := io.Copy(&bytesBuffer, data); ok == nil {
+		size := bytesBuffer.Len()
+		etag := fmt.Sprintf("%x", sha256.Sum256(bytesBuffer.Bytes()))
 		newObject.metadata = ObjectMetadata{
 			Key:        key,
 			SecCreated: time.Now().Unix(),
-			Size:       len(bytesBuffer.Bytes()),
+			Size:       size,
+			ETag:       etag,
 		}
 		newObject.data = bytesBuffer.Bytes()
 	}

pkg/webapi/minioapi/minioapi.go

@@ -43,6 +43,7 @@ func HttpHandler(storage *mstorage.Storage) http.Handler {
 	}
 	mux.HandleFunc("/", api.listBucketsHandler).Methods("GET")
 	mux.HandleFunc("/{bucket}", api.putBucketHandler).Methods("PUT")
+	mux.HandleFunc("/{bucket}", api.listObjectsHandler).Methods("GET")
 	mux.HandleFunc("/{bucket}/", api.listObjectsHandler).Methods("GET")
 	mux.HandleFunc("/{bucket}/{object:.*}", api.getObjectHandler).Methods("GET")
 	mux.HandleFunc("/{bucket}/{object:.*}", api.putObjectHandler).Methods("PUT")
@@ -200,7 +201,7 @@ func generateObjectsListResult(bucket string, objects []mstorage.ObjectMetadata)
 		content := Content{
 			Key:          object.Key,
 			LastModified: formatDate(object.SecCreated),
-			ETag:         object.Key,
+			ETag:         object.ETag,
 			Size:         object.Size,
 			StorageClass: "STANDARD",
 			Owner:        owner,

pkg/webapi/minioapi/minioapi_test.go

@@ -47,7 +47,7 @@ func TestMinioApi(t *testing.T) {
 			Owner:        owner,
 		},
 	}
-	data := &ListResponse{
+	data := &ObjectListResponse{
 		Name:     "name",
 		Contents: contents,
 	}