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118 lines
3.4 KiB
118 lines
3.4 KiB
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package api
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import (
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"bytes"
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"crypto/rand"
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"encoding/json"
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"encoding/xml"
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"net/http"
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"strconv"
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"github.com/minio/minio/pkg/donut"
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)
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// No encoder interface exists, so we create one.
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type encoder interface {
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Encode(v interface{}) error
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}
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//// helpers
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// Static alphaNumeric table used for generating unique request ids
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var alphaNumericTable = []byte("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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// generateRequestID generate request id
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func generateRequestID() []byte {
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alpha := make([]byte, 16)
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rand.Read(alpha)
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for i := 0; i < 16; i++ {
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alpha[i] = alphaNumericTable[alpha[i]%byte(len(alphaNumericTable))]
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}
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return alpha
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}
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// Write http common headers
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func setCommonHeaders(w http.ResponseWriter, acceptsType string, contentLength int) {
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// set unique request ID for each reply
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w.Header().Set("X-Amz-Request-Id", string(generateRequestID()))
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w.Header().Set("Server", "Minio")
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w.Header().Set("Accept-Ranges", "bytes")
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w.Header().Set("Content-Type", acceptsType)
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w.Header().Set("Connection", "close")
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// should be set to '0' by default
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w.Header().Set("Content-Length", strconv.Itoa(contentLength))
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}
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// Write error response headers
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func encodeErrorResponse(response interface{}, acceptsType contentType) []byte {
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var bytesBuffer bytes.Buffer
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var encoder encoder
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// write common headers
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switch acceptsType {
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case xmlContentType:
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encoder = xml.NewEncoder(&bytesBuffer)
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case jsonContentType:
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encoder = json.NewEncoder(&bytesBuffer)
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// by default even if unknown Accept header received handle it by sending XML contenttype response
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default:
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encoder = xml.NewEncoder(&bytesBuffer)
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}
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encoder.Encode(response)
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return bytesBuffer.Bytes()
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}
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// Write object header
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func setObjectHeaders(w http.ResponseWriter, metadata donut.ObjectMetadata, contentRange *httpRange) {
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// set common headers
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if contentRange != nil {
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if contentRange.length > 0 {
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setCommonHeaders(w, metadata.Metadata["contentType"], int(contentRange.length))
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} else {
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setCommonHeaders(w, metadata.Metadata["contentType"], int(metadata.Size))
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}
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} else {
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setCommonHeaders(w, metadata.Metadata["contentType"], int(metadata.Size))
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}
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// set object headers
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lastModified := metadata.Created.Format(http.TimeFormat)
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// object related headers
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w.Header().Set("ETag", "\""+metadata.MD5Sum+"\"")
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w.Header().Set("Last-Modified", lastModified)
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// set content range
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if contentRange != nil {
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if contentRange.start > 0 || contentRange.length > 0 {
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w.Header().Set("Content-Range", contentRange.String())
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w.WriteHeader(http.StatusPartialContent)
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}
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}
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}
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func encodeSuccessResponse(response interface{}, acceptsType contentType) []byte {
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var encoder encoder
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var bytesBuffer bytes.Buffer
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switch acceptsType {
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case xmlContentType:
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encoder = xml.NewEncoder(&bytesBuffer)
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case jsonContentType:
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encoder = json.NewEncoder(&bytesBuffer)
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}
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encoder.Encode(response)
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return bytesBuffer.Bytes()
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}
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