Migrate this project to minio micro services code

api-headers.go

@@ -0,0 +1,98 @@
+/*
+ * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/xml"
+	"net/http"
+	"runtime"
+	"strconv"
+
+	"github.com/minio/minio/pkg/fs"
+)
+
+//// helpers
+
+// Static alphaNumeric table used for generating unique request ids
+var alphaNumericTable = []byte("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+// generateRequestID generate request id
+func generateRequestID() []byte {
+	alpha := make([]byte, 16)
+	rand.Read(alpha)
+	for i := 0; i < 16; i++ {
+		alpha[i] = alphaNumericTable[alpha[i]%byte(len(alphaNumericTable))]
+	}
+	return alpha
+}
+
+// Write http common headers
+func setCommonHeaders(w http.ResponseWriter, contentLength int) {
+	// set unique request ID for each reply
+	w.Header().Set("X-Amz-Request-Id", string(generateRequestID()))
+	w.Header().Set("Server", ("Minio/" + minioReleaseTag + " (" + runtime.GOOS + ";" + runtime.GOARCH + ")"))
+	w.Header().Set("Accept-Ranges", "bytes")
+	w.Header().Set("Connection", "close")
+	// should be set to '0' by default
+	w.Header().Set("Content-Length", strconv.Itoa(contentLength))
+}
+
+// Write error response headers
+func encodeErrorResponse(response interface{}) []byte {
+	var bytesBuffer bytes.Buffer
+	// write common headers
+	e := xml.NewEncoder(&bytesBuffer)
+	e.Encode(response)
+	return bytesBuffer.Bytes()
+}
+
+// Write object header
+func setObjectHeaders(w http.ResponseWriter, metadata fs.ObjectMetadata, contentRange *httpRange) {
+	// set common headers
+	if contentRange != nil {
+		if contentRange.length > 0 {
+			setCommonHeaders(w, int(contentRange.length))
+		} else {
+			setCommonHeaders(w, int(metadata.Size))
+		}
+	} else {
+		setCommonHeaders(w, int(metadata.Size))
+	}
+	// set object headers
+	lastModified := metadata.Created.Format(http.TimeFormat)
+	// object related headers
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("ETag", "\""+metadata.Md5+"\"")
+	w.Header().Set("Last-Modified", lastModified)
+
+	// set content range
+	if contentRange != nil {
+		if contentRange.start > 0 || contentRange.length > 0 {
+			w.Header().Set("Content-Range", contentRange.String())
+			w.WriteHeader(http.StatusPartialContent)
+		}
+	}
+}
+
+func encodeSuccessResponse(response interface{}) []byte {
+	var bytesBuffer bytes.Buffer
+	e := xml.NewEncoder(&bytesBuffer)
+	e.Encode(response)
+	return bytesBuffer.Bytes()
+}