mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-04 16:00:25 +08:00
383 lines
10 KiB
Go
383 lines
10 KiB
Go
package nodes
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import (
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"context"
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"errors"
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"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
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"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
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"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
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"github.com/TeaOSLab/EdgeNode/internal/utils"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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)
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// 处理反向代理
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func (this *HTTPRequest) doReverseProxy() {
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if this.reverseProxy == nil {
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return
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}
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// 对URL的处理
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var stripPrefix = this.reverseProxy.StripPrefix
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var requestURI = this.reverseProxy.RequestURI
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var requestURIHasVariables = this.reverseProxy.RequestURIHasVariables()
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var requestHost = ""
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if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeCustomized {
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requestHost = this.reverseProxy.RequestHost
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}
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var requestHostHasVariables = this.reverseProxy.RequestHostHasVariables()
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// 源站
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var requestCall = shared.NewRequestCall()
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requestCall.Request = this.RawReq
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requestCall.Formatter = this.Format
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requestCall.Domain = this.ReqHost
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var origin *serverconfigs.OriginConfig
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// 二级节点
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if this.cacheRef != nil {
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origin = this.getLnOrigin()
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if origin != nil {
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// 强制变更原来访问的域名
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requestHost = this.ReqHost
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}
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}
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// 自定义源站
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if origin == nil {
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origin = this.reverseProxy.NextOrigin(requestCall)
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requestCall.CallResponseCallbacks(this.writer)
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if origin == nil {
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err := errors.New(this.URL() + ": no available origin sites for reverse proxy")
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remotelogs.ServerError(this.ReqServer.Id, "HTTP_REQUEST_REVERSE_PROXY", err.Error(), "", nil)
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this.write50x(err, http.StatusBadGateway, true)
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return
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}
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if len(origin.StripPrefix) > 0 {
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stripPrefix = origin.StripPrefix
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}
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if len(origin.RequestURI) > 0 {
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requestURI = origin.RequestURI
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requestURIHasVariables = origin.RequestURIHasVariables()
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}
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}
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this.origin = origin // 设置全局变量是为了日志等处理
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if len(origin.RequestHost) > 0 {
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requestHost = origin.RequestHost
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requestHostHasVariables = origin.RequestHostHasVariables()
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}
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// 处理Scheme
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if origin.Addr == nil {
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err := errors.New(this.URL() + ": origin '" + strconv.FormatInt(origin.Id, 10) + "' does not has a address")
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remotelogs.Error("HTTP_REQUEST_REVERSE_PROXY", err.Error())
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this.write50x(err, http.StatusBadGateway, true)
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return
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}
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this.RawReq.URL.Scheme = origin.Addr.Protocol.Primary().Scheme()
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// StripPrefix
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if len(stripPrefix) > 0 {
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if stripPrefix[0] != '/' {
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stripPrefix = "/" + stripPrefix
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}
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this.uri = strings.TrimPrefix(this.uri, stripPrefix)
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if len(this.uri) == 0 || this.uri[0] != '/' {
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this.uri = "/" + this.uri
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}
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}
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// RequestURI
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if len(requestURI) > 0 {
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if requestURIHasVariables {
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this.uri = this.Format(requestURI)
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} else {
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this.uri = requestURI
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}
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if len(this.uri) == 0 || this.uri[0] != '/' {
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this.uri = "/" + this.uri
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}
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// 处理RequestURI中的问号
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var questionMark = strings.LastIndex(this.uri, "?")
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if questionMark > 0 {
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var path = this.uri[:questionMark]
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if strings.Contains(path, "?") {
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this.uri = path + "&" + this.uri[questionMark+1:]
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}
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}
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// 去除多个/
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this.uri = utils.CleanPath(this.uri)
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}
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// 获取源站地址
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var originAddr = origin.Addr.PickAddress()
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if origin.Addr.HostHasVariables() {
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originAddr = this.Format(originAddr)
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}
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this.originAddr = originAddr
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// RequestHost
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if len(requestHost) > 0 {
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if requestHostHasVariables {
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this.RawReq.Host = this.Format(requestHost)
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} else {
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this.RawReq.Host = requestHost
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}
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this.RawReq.URL.Host = this.RawReq.Host
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} else if this.reverseProxy.RequestHostType == serverconfigs.RequestHostTypeOrigin {
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// 源站主机名
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var hostname = originAddr
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if origin.Addr.Protocol.IsHTTPFamily() {
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hostname = strings.TrimSuffix(hostname, ":80")
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} else if origin.Addr.Protocol.IsHTTPSFamily() {
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hostname = strings.TrimSuffix(hostname, ":443")
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}
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this.RawReq.Host = hostname
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this.RawReq.URL.Host = this.RawReq.Host
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} else {
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this.RawReq.URL.Host = this.ReqHost
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}
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// 重组请求URL
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var questionMark = strings.Index(this.uri, "?")
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if questionMark > -1 {
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this.RawReq.URL.Path = this.uri[:questionMark]
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this.RawReq.URL.RawQuery = this.uri[questionMark+1:]
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} else {
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this.RawReq.URL.Path = this.uri
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this.RawReq.URL.RawQuery = ""
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}
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this.RawReq.RequestURI = ""
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// 处理Header
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this.setForwardHeaders(this.RawReq.Header)
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this.processRequestHeaders(this.RawReq.Header)
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// 调用回调
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this.onRequest()
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if this.writer.isFinished {
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return
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}
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// 判断是否为Websocket请求
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if this.RawReq.Header.Get("Upgrade") == "websocket" {
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this.doWebsocket()
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return
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}
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// 获取请求客户端
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client, err := SharedHTTPClientPool.Client(this, origin, originAddr, this.reverseProxy.ProxyProtocol, this.reverseProxy.FollowRedirects)
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if err != nil {
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remotelogs.Error("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+err.Error())
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this.write50x(err, http.StatusBadGateway, true)
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return
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}
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// 在HTTP/2下需要防止因为requestBody而导致Content-Length为空的问题
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if this.RawReq.ProtoMajor == 2 && this.RawReq.ContentLength == 0 {
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_ = this.RawReq.Body.Close()
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this.RawReq.Body = nil
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}
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// 开始请求
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resp, err := client.Do(this.RawReq)
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if err != nil {
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// 客户端取消请求，则不提示
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httpErr, ok := err.(*url.Error)
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if !ok {
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SharedOriginStateManager.Fail(origin, this.reverseProxy, func() {
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this.reverseProxy.ResetScheduling()
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})
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this.write50x(err, http.StatusBadGateway, true)
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.RawReq.URL.String()+"': "+err.Error())
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} else if httpErr.Err != context.Canceled {
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SharedOriginStateManager.Fail(origin, this.reverseProxy, func() {
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this.reverseProxy.ResetScheduling()
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})
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if httpErr.Timeout() {
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this.write50x(err, http.StatusGatewayTimeout, true)
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} else if httpErr.Temporary() {
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this.write50x(err, http.StatusServiceUnavailable, true)
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} else {
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this.write50x(err, http.StatusBadGateway, true)
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}
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if httpErr.Err != io.EOF {
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+err.Error())
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}
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} else {
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// 是否为客户端方面的错误
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var isClientError = false
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if ok {
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if httpErr.Err == context.Canceled {
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// 如果是服务器端主动关闭，则无需提示
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if this.isConnClosed() {
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this.disableLog = true
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return
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}
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isClientError = true
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this.addError(errors.New(httpErr.Op + " " + httpErr.URL + ": client closed the connection"))
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this.writer.WriteHeader(499) // 仿照nginx
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}
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}
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if !isClientError {
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this.write50x(err, http.StatusBadGateway, true)
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}
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}
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if resp != nil && resp.Body != nil {
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_ = resp.Body.Close()
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}
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return
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}
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if !origin.IsOk {
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SharedOriginStateManager.Success(origin, func() {
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this.reverseProxy.ResetScheduling()
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})
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}
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// WAF对出站进行检查
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if this.web.FirewallRef != nil && this.web.FirewallRef.IsOn {
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if this.doWAFResponse(resp) {
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err = resp.Body.Close()
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if err != nil {
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+err.Error())
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}
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return
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}
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}
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// 特殊页面
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if len(this.web.Pages) > 0 && this.doPage(resp.StatusCode) {
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err = resp.Body.Close()
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if err != nil {
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+err.Error())
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}
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return
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}
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// 设置Charset
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// TODO 这里应该可以设置文本类型的列表，以及是否强制覆盖所有文本类型的字符集
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if this.web.Charset != nil && this.web.Charset.IsOn && len(this.web.Charset.Charset) > 0 {
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contentTypes, ok := resp.Header["Content-Type"]
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if ok && len(contentTypes) > 0 {
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var contentType = contentTypes[0]
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if _, found := textMimeMap[contentType]; found {
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resp.Header["Content-Type"][0] = contentType + "; charset=" + this.web.Charset.Charset
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}
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}
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}
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// 替换Location中的源站地址
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var locationHeader = resp.Header.Get("Location")
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if len(locationHeader) > 0 {
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// 空Location处理
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if locationHeader == emptyHTTPLocation {
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resp.Header.Del("Location")
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} else {
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// 自动修正Location中的源站地址
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locationURL, err := url.Parse(locationHeader)
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if err == nil && locationURL.Host != this.ReqHost && (locationURL.Host == originAddr || strings.HasPrefix(originAddr, locationURL.Host+":")) {
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locationURL.Host = this.ReqHost
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var oldScheme = locationURL.Scheme
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// 尝试和当前Scheme一致
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if this.IsHTTP {
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locationURL.Scheme = "http"
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} else if this.IsHTTPS {
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locationURL.Scheme = "https"
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}
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// 如果和当前URL一样，则可能是http -> https，防止无限循环
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if locationURL.String() == this.URL() {
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locationURL.Scheme = oldScheme
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resp.Header.Set("Location", locationURL.String())
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} else {
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resp.Header.Set("Location", locationURL.String())
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}
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}
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}
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}
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// 响应Header
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this.writer.AddHeaders(resp.Header)
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this.processResponseHeaders(resp.StatusCode)
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// 是否需要刷新
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var shouldAutoFlush = this.reverseProxy.AutoFlush || this.RawReq.Header.Get("Accept") == "text/event-stream"
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// 准备
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var delayHeaders = this.writer.Prepare(resp, resp.ContentLength, resp.StatusCode, true)
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// 设置响应代码
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if !delayHeaders {
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this.writer.WriteHeader(resp.StatusCode)
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}
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// 是否有内容
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if resp.ContentLength == 0 && len(resp.TransferEncoding) == 0 {
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// 即使内容为0，也需要读取一次，以便于触发相关事件
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var buf = utils.BytePool4k.Get()
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_, _ = io.CopyBuffer(this.writer, resp.Body, buf)
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utils.BytePool4k.Put(buf)
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_ = resp.Body.Close()
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this.writer.SetOk()
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return
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}
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// 输出到客户端
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var pool = this.bytePool(resp.ContentLength)
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var buf = pool.Get()
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if shouldAutoFlush {
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for {
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n, readErr := resp.Body.Read(buf)
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if n > 0 {
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_, err = this.writer.Write(buf[:n])
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this.writer.Flush()
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if err != nil {
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break
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}
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}
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if readErr != nil {
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err = readErr
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break
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}
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}
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} else {
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_, err = io.CopyBuffer(this.writer, resp.Body, buf)
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}
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pool.Put(buf)
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var closeErr = resp.Body.Close()
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if closeErr != nil {
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if !this.canIgnore(closeErr) {
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+closeErr.Error())
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}
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}
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if err != nil && err != io.EOF {
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if !this.canIgnore(err) {
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remotelogs.Warn("HTTP_REQUEST_REVERSE_PROXY", this.URL()+": "+err.Error())
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this.addError(err)
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}
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}
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// 是否成功结束
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if (err == nil || err == io.EOF) && (closeErr == nil || closeErr == io.EOF) {
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this.writer.SetOk()
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}
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}
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