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package s3err
import (
"bytes"
"encoding/xml"
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"net/http"
"strconv"
"time"
)
type mimeType string
const (
mimeNone mimeType = ""
MimeXML mimeType = "application/xml"
)
func WriteXMLResponse(w http.ResponseWriter, statusCode int, response interface{}) {
WriteResponse(w, statusCode, EncodeXMLResponse(response), MimeXML)
}
func WriteEmptyResponse(w http.ResponseWriter, statusCode int) {
WriteResponse(w, statusCode, []byte{}, mimeNone)
}
func WriteErrorResponse(w http.ResponseWriter, errorCode ErrorCode, r *http.Request) {
apiError := GetAPIError(errorCode)
errorResponse := getRESTErrorResponse(apiError, r.URL.Path)
encodedErrorResponse := EncodeXMLResponse(errorResponse)
WriteResponse(w, apiError.HTTPStatusCode, encodedErrorResponse, MimeXML)
}
func getRESTErrorResponse(err APIError, resource string) RESTErrorResponse {
return RESTErrorResponse{
Code: err.Code,
Message: err.Description,
Resource: resource,
RequestID: fmt.Sprintf("%d", time.Now().UnixNano()),
}
}
// Encodes the response headers into XML format.
func EncodeXMLResponse(response interface{}) []byte {
var bytesBuffer bytes.Buffer
bytesBuffer.WriteString(xml.Header)
e := xml.NewEncoder(&bytesBuffer)
e.Encode(response)
return bytesBuffer.Bytes()
}
func setCommonHeaders(w http.ResponseWriter) {
w.Header().Set("x-amz-request-id", fmt.Sprintf("%d", time.Now().UnixNano()))
w.Header().Set("Accept-Ranges", "bytes")
}
func WriteResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
setCommonHeaders(w)
if response != nil {
w.Header().Set("Content-Length", strconv.Itoa(len(response)))
}
if mType != mimeNone {
w.Header().Set("Content-Type", string(mType))
}
w.WriteHeader(statusCode)
if response != nil {
glog.V(4).Infof("status %d %s: %s", statusCode, mType, string(response))
_, err := w.Write(response)
if err != nil {
glog.V(0).Infof("write err: %v", err)
}
w.(http.Flusher).Flush()
}
}
// If none of the http routes match respond with MethodNotAllowed
func NotFoundHandler(w http.ResponseWriter, r *http.Request) {
glog.V(0).Infof("unsupported %s %s", r.Method, r.RequestURI)
WriteErrorResponse(w, ErrMethodNotAllowed, r)
}
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