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http_service.go
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http_service.go
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/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* hprose/http_service.go *
* *
* hprose http service for Go. *
* *
* LastModified: Dec 21, 2014 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package hprose
import (
"io"
"io/ioutil"
"math/rand"
"net/http"
"reflect"
"strconv"
"strings"
"time"
)
type HttpContext struct {
*BaseContext
Response http.ResponseWriter
Request *http.Request
}
type HttpServiceEvent interface {
ServiceEvent
OnSendHeader(context *HttpContext)
}
type HttpService struct {
*BaseService
P3PEnabled bool
GetEnabled bool
CrossDomainEnabled bool
accessControlAllowOrigins map[string]bool
lastModified string
etag string
crossDomainXmlFile string
crossDomainXmlContent []byte
clientAccessPolicyXmlFile string
clientAccessPolicyXmlContent []byte
}
type httpArgsFixer struct{}
func (httpArgsFixer) FixArgs(args []reflect.Value, lastParamType reflect.Type, context Context) []reflect.Value {
if c, ok := context.(*HttpContext); ok {
if lastParamType.String() == "*hprose.HttpContext" {
return append(args, reflect.ValueOf(c))
} else if lastParamType.String() == "*http.Request" {
return append(args, reflect.ValueOf(c.Request))
}
}
return fixArgs(args, lastParamType, context)
}
func NewHttpService() *HttpService {
t := time.Now().UTC()
rand.Seed(t.UnixNano())
service := &HttpService{
BaseService: NewBaseService(),
P3PEnabled: true,
GetEnabled: true,
CrossDomainEnabled: true,
accessControlAllowOrigins: make(map[string]bool),
lastModified: t.Format(time.RFC1123),
etag: `"` + strconv.FormatInt(rand.Int63(), 16) + `"`,
}
service.argsfixer = httpArgsFixer{}
return service
}
func (service *HttpService) crossDomainXmlHandler(response http.ResponseWriter, request *http.Request) bool {
if strings.ToLower(request.URL.Path) == "/crossdomain.xml" {
if request.Header.Get("if-modified-since") == service.lastModified &&
request.Header.Get("if-none-match") == service.etag {
response.WriteHeader(304)
} else {
response.Header().Set("Last-Modified", service.lastModified)
response.Header().Set("Etag", service.etag)
response.Header().Set("Content-Type", "text/xml")
response.Header().Set("Content-Length", strconv.Itoa(len(service.crossDomainXmlContent)))
response.Write(service.crossDomainXmlContent)
}
return true
}
return false
}
func (service *HttpService) clientAccessPolicyXmlHandler(response http.ResponseWriter, request *http.Request) bool {
if strings.ToLower(request.URL.Path) == "/clientaccesspolicy.xml" {
if request.Header.Get("if-modified-since") == service.lastModified &&
request.Header.Get("if-none-match") == service.etag {
response.WriteHeader(304)
} else {
response.Header().Set("Last-Modified", service.lastModified)
response.Header().Set("Etag", service.etag)
response.Header().Set("Content-Type", "text/xml")
response.Header().Set("Content-Length", strconv.Itoa(len(service.clientAccessPolicyXmlContent)))
response.Write(service.clientAccessPolicyXmlContent)
}
return true
}
return false
}
func (service *HttpService) sendHeader(context *HttpContext) {
if service.ServiceEvent != nil {
if event, ok := service.ServiceEvent.(HttpServiceEvent); ok {
event.OnSendHeader(context)
}
}
context.Response.Header().Set("Content-Type", "text/plain")
if service.P3PEnabled {
context.Response.Header().Set("P3P", `CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi `+
`CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL `+
`UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE GOV"`)
}
if service.CrossDomainEnabled {
origin := context.Request.Header.Get("origin")
if origin != "" && origin != "null" {
if len(service.accessControlAllowOrigins) == 0 || service.accessControlAllowOrigins[origin] {
context.Response.Header().Set("Access-Control-Allow-Origin", origin)
context.Response.Header().Set("Access-Control-Allow-Credentials", "true")
}
} else {
context.Response.Header().Set("Access-Control-Allow-Origin", "*")
}
}
}
func (service *HttpService) AddAccessControlAllowOrigin(origin string) {
service.accessControlAllowOrigins[origin] = true
}
func (service *HttpService) RemoveAccessControlAllowOrigin(origin string) {
delete(service.accessControlAllowOrigins, origin)
}
func (service *HttpService) CrossDomainXmlFile() string {
return service.crossDomainXmlFile
}
func (service *HttpService) CrossDomainXmlContent() []byte {
return service.crossDomainXmlContent
}
func (service *HttpService) ClientAccessPolicyXmlFile() string {
return service.clientAccessPolicyXmlFile
}
func (service *HttpService) ClientAccessPolicyXmlContent() []byte {
return service.clientAccessPolicyXmlContent
}
func (service *HttpService) SetCrossDomainXmlFile(filename string) {
service.crossDomainXmlFile = filename
service.crossDomainXmlContent, _ = ioutil.ReadFile(filename)
}
func (service *HttpService) SetClientAccessPolicyXmlFile(filename string) {
service.clientAccessPolicyXmlFile = filename
service.clientAccessPolicyXmlContent, _ = ioutil.ReadFile(filename)
}
func (service *HttpService) SetCrossDomainXmlContent(content []byte) {
service.crossDomainXmlFile = ""
service.crossDomainXmlContent = content
}
func (service *HttpService) SetClientAccessPolicyXmlContent(content []byte) {
service.clientAccessPolicyXmlFile = ""
service.clientAccessPolicyXmlContent = content
}
func (service *HttpService) readAll(request *http.Request) (data []byte, err error) {
if request.ContentLength > 0 {
data = make([]byte, request.ContentLength)
_, err = io.ReadFull(request.Body, data)
return data, err
}
if request.ContentLength < 0 {
return ioutil.ReadAll(request.Body)
}
return make([]byte, 0), nil
}
func (service *HttpService) Serve(response http.ResponseWriter, request *http.Request, userData map[string]interface{}) {
if service.clientAccessPolicyXmlContent != nil && service.clientAccessPolicyXmlHandler(response, request) {
return
}
if service.crossDomainXmlContent != nil && service.crossDomainXmlHandler(response, request) {
return
}
context := &HttpContext{BaseContext: NewBaseContext(), Response: response, Request: request}
if userData != nil {
for k, v := range userData {
context.SetInterface(k, v);
}
}
service.sendHeader(context)
switch request.Method {
case "GET":
if service.GetEnabled {
response.Write(service.doFunctionList(context))
} else {
response.WriteHeader(403)
}
case "POST":
data, err := service.readAll(request)
request.Body.Close()
if err != nil {
response.Write(service.sendError(err, context))
}
response.Write(service.Handle(data, context))
}
}
func (service *HttpService) ServeHTTP(response http.ResponseWriter, request *http.Request) {
service.Serve(response, request, nil)
}