97 lines
2.9 KiB
Go
97 lines
2.9 KiB
Go
package auth
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import (
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"io/ioutil"
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"net"
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"net/http"
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"strings"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/types"
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"github.com/vulcand/oxy/forward"
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"github.com/vulcand/oxy/utils"
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)
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// Forward the authentication to a external server
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func Forward(config *types.Forward, w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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httpClient := http.Client{}
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if config.TLS != nil {
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tlsConfig, err := config.TLS.CreateTLSConfig()
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if err != nil {
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log.Debugf("Impossible to configure TLS to call %s. Cause %s", config.Address, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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httpClient.Transport = &http.Transport{
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TLSClientConfig: tlsConfig,
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}
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}
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forwardReq, err := http.NewRequest(http.MethodGet, config.Address, nil)
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if err != nil {
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log.Debugf("Error calling %s. Cause %s", config.Address, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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writeHeader(r, forwardReq, config.TrustForwardHeader)
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forwardResponse, forwardErr := httpClient.Do(forwardReq)
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if forwardErr != nil {
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log.Debugf("Error calling %s. Cause: %s", config.Address, forwardErr)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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body, readError := ioutil.ReadAll(forwardResponse.Body)
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if readError != nil {
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log.Debugf("Error reading body %s. Cause: %s", config.Address, readError)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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defer forwardResponse.Body.Close()
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if forwardResponse.StatusCode < http.StatusOK || forwardResponse.StatusCode >= http.StatusMultipleChoices {
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log.Debugf("Remote error %s. StatusCode: %d", config.Address, forwardResponse.StatusCode)
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w.WriteHeader(forwardResponse.StatusCode)
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w.Write(body)
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return
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}
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r.RequestURI = r.URL.RequestURI()
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next(w, r)
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}
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func writeHeader(req *http.Request, forwardReq *http.Request, trustForwardHeader bool) {
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utils.CopyHeaders(forwardReq.Header, req.Header)
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if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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if trustForwardHeader {
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if prior, ok := req.Header[forward.XForwardedFor]; ok {
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clientIP = strings.Join(prior, ", ") + ", " + clientIP
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}
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}
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forwardReq.Header.Set(forward.XForwardedFor, clientIP)
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}
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if xfp := req.Header.Get(forward.XForwardedProto); xfp != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedProto, xfp)
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} else if req.TLS != nil {
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forwardReq.Header.Set(forward.XForwardedProto, "https")
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} else {
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forwardReq.Header.Set(forward.XForwardedProto, "http")
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}
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if xfp := req.Header.Get(forward.XForwardedPort); xfp != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedPort, xfp)
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}
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if xfh := req.Header.Get(forward.XForwardedHost); xfh != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedHost, xfh)
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} else if req.Host != "" {
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forwardReq.Header.Set(forward.XForwardedHost, req.Host)
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} else {
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forwardReq.Header.Del(forward.XForwardedHost)
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}
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}
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