traefik/middlewares/auth/forward.go

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package auth
import (
"io/ioutil"
"net"
"net/http"
"strings"
"github.com/containous/traefik/log"
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"github.com/containous/traefik/middlewares/tracing"
"github.com/containous/traefik/types"
"github.com/vulcand/oxy/forward"
"github.com/vulcand/oxy/utils"
)
const (
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xForwardedURI = "X-Forwarded-Uri"
xForwardedMethod = "X-Forwarded-Method"
)
// Forward the authentication to a external server
func Forward(config *types.Forward, w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
// Ensure our request client does not follow redirects
httpClient := http.Client{
CheckRedirect: func(r *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
if config.TLS != nil {
tlsConfig, err := config.TLS.CreateTLSConfig()
if err != nil {
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tracing.SetErrorAndDebugLog(r, "Unable to configure TLS to call %s. Cause %s", config.Address, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
httpClient.Transport = &http.Transport{
TLSClientConfig: tlsConfig,
}
}
forwardReq, err := http.NewRequest(http.MethodGet, config.Address, nil)
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tracing.LogRequest(tracing.GetSpan(r), forwardReq)
if err != nil {
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tracing.SetErrorAndDebugLog(r, "Error calling %s. Cause %s", config.Address, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
writeHeader(r, forwardReq, config.TrustForwardHeader)
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tracing.InjectRequestHeaders(forwardReq)
forwardResponse, forwardErr := httpClient.Do(forwardReq)
if forwardErr != nil {
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tracing.SetErrorAndDebugLog(r, "Error calling %s. Cause: %s", config.Address, forwardErr)
w.WriteHeader(http.StatusInternalServerError)
return
}
body, readError := ioutil.ReadAll(forwardResponse.Body)
if readError != nil {
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tracing.SetErrorAndDebugLog(r, "Error reading body %s. Cause: %s", config.Address, readError)
w.WriteHeader(http.StatusInternalServerError)
return
}
defer forwardResponse.Body.Close()
// Pass the forward response's body and selected headers if it
// didn't return a response within the range of [200, 300).
if forwardResponse.StatusCode < http.StatusOK || forwardResponse.StatusCode >= http.StatusMultipleChoices {
log.Debugf("Remote error %s. StatusCode: %d", config.Address, forwardResponse.StatusCode)
utils.CopyHeaders(w.Header(), forwardResponse.Header)
utils.RemoveHeaders(w.Header(), forward.HopHeaders...)
// Grab the location header, if any.
redirectURL, err := forwardResponse.Location()
if err != nil {
if err != http.ErrNoLocation {
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tracing.SetErrorAndDebugLog(r, "Error reading response location header %s. Cause: %s", config.Address, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
} else if redirectURL.String() != "" {
// Set the location in our response if one was sent back.
w.Header().Set("Location", redirectURL.String())
}
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tracing.LogResponseCode(tracing.GetSpan(r), forwardResponse.StatusCode)
w.WriteHeader(forwardResponse.StatusCode)
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if _, err = w.Write(body); err != nil {
log.Error(err)
}
return
}
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for _, headerName := range config.AuthResponseHeaders {
r.Header.Set(headerName, forwardResponse.Header.Get(headerName))
}
r.RequestURI = r.URL.RequestURI()
next(w, r)
}
func writeHeader(req *http.Request, forwardReq *http.Request, trustForwardHeader bool) {
utils.CopyHeaders(forwardReq.Header, req.Header)
if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
if trustForwardHeader {
if prior, ok := req.Header[forward.XForwardedFor]; ok {
clientIP = strings.Join(prior, ", ") + ", " + clientIP
}
}
forwardReq.Header.Set(forward.XForwardedFor, clientIP)
}
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if xMethod := req.Header.Get(xForwardedMethod); xMethod != "" && trustForwardHeader {
forwardReq.Header.Set(xForwardedMethod, xMethod)
} else if req.Method != "" {
forwardReq.Header.Set(xForwardedMethod, req.Method)
} else {
forwardReq.Header.Del(xForwardedMethod)
}
if xfp := req.Header.Get(forward.XForwardedProto); xfp != "" && trustForwardHeader {
forwardReq.Header.Set(forward.XForwardedProto, xfp)
} else if req.TLS != nil {
forwardReq.Header.Set(forward.XForwardedProto, "https")
} else {
forwardReq.Header.Set(forward.XForwardedProto, "http")
}
if xfp := req.Header.Get(forward.XForwardedPort); xfp != "" && trustForwardHeader {
forwardReq.Header.Set(forward.XForwardedPort, xfp)
}
if xfh := req.Header.Get(forward.XForwardedHost); xfh != "" && trustForwardHeader {
forwardReq.Header.Set(forward.XForwardedHost, xfh)
} else if req.Host != "" {
forwardReq.Header.Set(forward.XForwardedHost, req.Host)
} else {
forwardReq.Header.Del(forward.XForwardedHost)
}
if xfURI := req.Header.Get(xForwardedURI); xfURI != "" && trustForwardHeader {
forwardReq.Header.Set(xForwardedURI, xfURI)
} else if req.URL.RequestURI() != "" {
forwardReq.Header.Set(xForwardedURI, req.URL.RequestURI())
} else {
forwardReq.Header.Del(xForwardedURI)
}
}