mirror of
https://github.com/crazy-max/diun.git
synced 2024-12-22 19:38:28 +00:00
260 lines
10 KiB
Go
260 lines
10 KiB
Go
package restful
|
|
|
|
// Copyright 2013 Ernest Micklei. All rights reserved.
|
|
// Use of this source code is governed by a license
|
|
// that can be found in the LICENSE file.
|
|
|
|
import (
|
|
"bufio"
|
|
"errors"
|
|
"net"
|
|
"net/http"
|
|
)
|
|
|
|
// DefaultResponseMimeType is DEPRECATED, use DefaultResponseContentType(mime)
|
|
var DefaultResponseMimeType string
|
|
|
|
//PrettyPrintResponses controls the indentation feature of XML and JSON serialization
|
|
var PrettyPrintResponses = true
|
|
|
|
// Response is a wrapper on the actual http ResponseWriter
|
|
// It provides several convenience methods to prepare and write response content.
|
|
type Response struct {
|
|
http.ResponseWriter
|
|
requestAccept string // mime-type what the Http Request says it wants to receive
|
|
routeProduces []string // mime-types what the Route says it can produce
|
|
statusCode int // HTTP status code that has been written explicitly (if zero then net/http has written 200)
|
|
contentLength int // number of bytes written for the response body
|
|
prettyPrint bool // controls the indentation feature of XML and JSON serialization. It is initialized using var PrettyPrintResponses.
|
|
err error // err property is kept when WriteError is called
|
|
hijacker http.Hijacker // if underlying ResponseWriter supports it
|
|
}
|
|
|
|
// NewResponse creates a new response based on a http ResponseWriter.
|
|
func NewResponse(httpWriter http.ResponseWriter) *Response {
|
|
hijacker, _ := httpWriter.(http.Hijacker)
|
|
return &Response{ResponseWriter: httpWriter, routeProduces: []string{}, statusCode: http.StatusOK, prettyPrint: PrettyPrintResponses, hijacker: hijacker}
|
|
}
|
|
|
|
// DefaultResponseContentType set a default.
|
|
// If Accept header matching fails, fall back to this type.
|
|
// Valid values are restful.MIME_JSON and restful.MIME_XML
|
|
// Example:
|
|
// restful.DefaultResponseContentType(restful.MIME_JSON)
|
|
func DefaultResponseContentType(mime string) {
|
|
DefaultResponseMimeType = mime
|
|
}
|
|
|
|
// InternalServerError writes the StatusInternalServerError header.
|
|
// DEPRECATED, use WriteErrorString(http.StatusInternalServerError,reason)
|
|
func (r Response) InternalServerError() Response {
|
|
r.WriteHeader(http.StatusInternalServerError)
|
|
return r
|
|
}
|
|
|
|
// Hijack implements the http.Hijacker interface. This expands
|
|
// the Response to fulfill http.Hijacker if the underlying
|
|
// http.ResponseWriter supports it.
|
|
func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
|
if r.hijacker == nil {
|
|
return nil, nil, errors.New("http.Hijacker not implemented by underlying http.ResponseWriter")
|
|
}
|
|
return r.hijacker.Hijack()
|
|
}
|
|
|
|
// PrettyPrint changes whether this response must produce pretty (line-by-line, indented) JSON or XML output.
|
|
func (r *Response) PrettyPrint(bePretty bool) {
|
|
r.prettyPrint = bePretty
|
|
}
|
|
|
|
// AddHeader is a shortcut for .Header().Add(header,value)
|
|
func (r Response) AddHeader(header string, value string) Response {
|
|
r.Header().Add(header, value)
|
|
return r
|
|
}
|
|
|
|
// SetRequestAccepts tells the response what Mime-type(s) the HTTP request said it wants to accept. Exposed for testing.
|
|
func (r *Response) SetRequestAccepts(mime string) {
|
|
r.requestAccept = mime
|
|
}
|
|
|
|
// EntityWriter returns the registered EntityWriter that the entity (requested resource)
|
|
// can write according to what the request wants (Accept) and what the Route can produce or what the restful defaults say.
|
|
// If called before WriteEntity and WriteHeader then a false return value can be used to write a 406: Not Acceptable.
|
|
func (r *Response) EntityWriter() (EntityReaderWriter, bool) {
|
|
sorted := sortedMimes(r.requestAccept)
|
|
for _, eachAccept := range sorted {
|
|
for _, eachProduce := range r.routeProduces {
|
|
if eachProduce == eachAccept.media {
|
|
if w, ok := entityAccessRegistry.accessorAt(eachAccept.media); ok {
|
|
return w, true
|
|
}
|
|
}
|
|
}
|
|
if eachAccept.media == "*/*" {
|
|
for _, each := range r.routeProduces {
|
|
if w, ok := entityAccessRegistry.accessorAt(each); ok {
|
|
return w, true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// if requestAccept is empty
|
|
writer, ok := entityAccessRegistry.accessorAt(r.requestAccept)
|
|
if !ok {
|
|
// if not registered then fallback to the defaults (if set)
|
|
if DefaultResponseMimeType == MIME_JSON {
|
|
return entityAccessRegistry.accessorAt(MIME_JSON)
|
|
}
|
|
if DefaultResponseMimeType == MIME_XML {
|
|
return entityAccessRegistry.accessorAt(MIME_XML)
|
|
}
|
|
if DefaultResponseMimeType == MIME_ZIP {
|
|
return entityAccessRegistry.accessorAt(MIME_ZIP)
|
|
}
|
|
// Fallback to whatever the route says it can produce.
|
|
// https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
|
|
for _, each := range r.routeProduces {
|
|
if w, ok := entityAccessRegistry.accessorAt(each); ok {
|
|
return w, true
|
|
}
|
|
}
|
|
if trace {
|
|
traceLogger.Printf("no registered EntityReaderWriter found for %s", r.requestAccept)
|
|
}
|
|
}
|
|
return writer, ok
|
|
}
|
|
|
|
// WriteEntity calls WriteHeaderAndEntity with Http Status OK (200)
|
|
func (r *Response) WriteEntity(value interface{}) error {
|
|
return r.WriteHeaderAndEntity(http.StatusOK, value)
|
|
}
|
|
|
|
// WriteHeaderAndEntity marshals the value using the representation denoted by the Accept Header and the registered EntityWriters.
|
|
// If no Accept header is specified (or */*) then respond with the Content-Type as specified by the first in the Route.Produces.
|
|
// If an Accept header is specified then respond with the Content-Type as specified by the first in the Route.Produces that is matched with the Accept header.
|
|
// If the value is nil then no response is send except for the Http status. You may want to call WriteHeader(http.StatusNotFound) instead.
|
|
// If there is no writer available that can represent the value in the requested MIME type then Http Status NotAcceptable is written.
|
|
// Current implementation ignores any q-parameters in the Accept Header.
|
|
// Returns an error if the value could not be written on the response.
|
|
func (r *Response) WriteHeaderAndEntity(status int, value interface{}) error {
|
|
writer, ok := r.EntityWriter()
|
|
if !ok {
|
|
r.WriteHeader(http.StatusNotAcceptable)
|
|
return nil
|
|
}
|
|
return writer.Write(r, status, value)
|
|
}
|
|
|
|
// WriteAsXml is a convenience method for writing a value in xml (requires Xml tags on the value)
|
|
// It uses the standard encoding/xml package for marshalling the value ; not using a registered EntityReaderWriter.
|
|
func (r *Response) WriteAsXml(value interface{}) error {
|
|
return writeXML(r, http.StatusOK, MIME_XML, value)
|
|
}
|
|
|
|
// WriteHeaderAndXml is a convenience method for writing a status and value in xml (requires Xml tags on the value)
|
|
// It uses the standard encoding/xml package for marshalling the value ; not using a registered EntityReaderWriter.
|
|
func (r *Response) WriteHeaderAndXml(status int, value interface{}) error {
|
|
return writeXML(r, status, MIME_XML, value)
|
|
}
|
|
|
|
// WriteAsJson is a convenience method for writing a value in json.
|
|
// It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.
|
|
func (r *Response) WriteAsJson(value interface{}) error {
|
|
return writeJSON(r, http.StatusOK, MIME_JSON, value)
|
|
}
|
|
|
|
// WriteJson is a convenience method for writing a value in Json with a given Content-Type.
|
|
// It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.
|
|
func (r *Response) WriteJson(value interface{}, contentType string) error {
|
|
return writeJSON(r, http.StatusOK, contentType, value)
|
|
}
|
|
|
|
// WriteHeaderAndJson is a convenience method for writing the status and a value in Json with a given Content-Type.
|
|
// It uses the standard encoding/json package for marshalling the value ; not using a registered EntityReaderWriter.
|
|
func (r *Response) WriteHeaderAndJson(status int, value interface{}, contentType string) error {
|
|
return writeJSON(r, status, contentType, value)
|
|
}
|
|
|
|
// WriteError writes the http status and the error string on the response. err can be nil.
|
|
// Return an error if writing was not successful.
|
|
func (r *Response) WriteError(httpStatus int, err error) (writeErr error) {
|
|
r.err = err
|
|
if err == nil {
|
|
writeErr = r.WriteErrorString(httpStatus, "")
|
|
} else {
|
|
writeErr = r.WriteErrorString(httpStatus, err.Error())
|
|
}
|
|
return writeErr
|
|
}
|
|
|
|
// WriteServiceError is a convenience method for a responding with a status and a ServiceError
|
|
func (r *Response) WriteServiceError(httpStatus int, err ServiceError) error {
|
|
r.err = err
|
|
return r.WriteHeaderAndEntity(httpStatus, err)
|
|
}
|
|
|
|
// WriteErrorString is a convenience method for an error status with the actual error
|
|
func (r *Response) WriteErrorString(httpStatus int, errorReason string) error {
|
|
if r.err == nil {
|
|
// if not called from WriteError
|
|
r.err = errors.New(errorReason)
|
|
}
|
|
r.WriteHeader(httpStatus)
|
|
if _, err := r.Write([]byte(errorReason)); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Flush implements http.Flusher interface, which sends any buffered data to the client.
|
|
func (r *Response) Flush() {
|
|
if f, ok := r.ResponseWriter.(http.Flusher); ok {
|
|
f.Flush()
|
|
} else if trace {
|
|
traceLogger.Printf("ResponseWriter %v doesn't support Flush", r)
|
|
}
|
|
}
|
|
|
|
// WriteHeader is overridden to remember the Status Code that has been written.
|
|
// Changes to the Header of the response have no effect after this.
|
|
func (r *Response) WriteHeader(httpStatus int) {
|
|
r.statusCode = httpStatus
|
|
r.ResponseWriter.WriteHeader(httpStatus)
|
|
}
|
|
|
|
// StatusCode returns the code that has been written using WriteHeader.
|
|
func (r Response) StatusCode() int {
|
|
if 0 == r.statusCode {
|
|
// no status code has been written yet; assume OK
|
|
return http.StatusOK
|
|
}
|
|
return r.statusCode
|
|
}
|
|
|
|
// Write writes the data to the connection as part of an HTTP reply.
|
|
// Write is part of http.ResponseWriter interface.
|
|
func (r *Response) Write(bytes []byte) (int, error) {
|
|
written, err := r.ResponseWriter.Write(bytes)
|
|
r.contentLength += written
|
|
return written, err
|
|
}
|
|
|
|
// ContentLength returns the number of bytes written for the response content.
|
|
// Note that this value is only correct if all data is written through the Response using its Write* methods.
|
|
// Data written directly using the underlying http.ResponseWriter is not accounted for.
|
|
func (r Response) ContentLength() int {
|
|
return r.contentLength
|
|
}
|
|
|
|
// CloseNotify is part of http.CloseNotifier interface
|
|
func (r Response) CloseNotify() <-chan bool {
|
|
return r.ResponseWriter.(http.CloseNotifier).CloseNotify()
|
|
}
|
|
|
|
// Error returns the err created by WriteError
|
|
func (r Response) Error() error {
|
|
return r.err
|
|
}
|