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authentik/outpost/pkg/proxy/middleware.go

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package proxy
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import (
"bufio"
"errors"
"fmt"
"net"
"net/http"
"time"
log "github.com/sirupsen/logrus"
)
// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP status
// code and body size
type responseLogger struct {
w http.ResponseWriter
status int
size int
upstream string
authInfo string
}
// Header returns the ResponseWriter's Header
func (l *responseLogger) Header() http.Header {
return l.w.Header()
}
// Support Websocket
func (l *responseLogger) Hijack() (rwc net.Conn, buf *bufio.ReadWriter, err error) {
if hj, ok := l.w.(http.Hijacker); ok {
return hj.Hijack()
}
return nil, nil, errors.New("http.Hijacker is not available on writer")
}
// ExtractGAPMetadata extracts and removes GAP headers from the ResponseWriter's
// Header
func (l *responseLogger) ExtractGAPMetadata() {
upstream := l.w.Header().Get("GAP-Upstream-Address")
if upstream != "" {
l.upstream = upstream
l.w.Header().Del("GAP-Upstream-Address")
}
authInfo := l.w.Header().Get("GAP-Auth")
if authInfo != "" {
l.authInfo = authInfo
l.w.Header().Del("GAP-Auth")
}
}
// Write writes the response using the ResponseWriter
func (l *responseLogger) Write(b []byte) (int, error) {
if l.status == 0 {
// The status will be StatusOK if WriteHeader has not been called yet
l.status = http.StatusOK
}
l.ExtractGAPMetadata()
size, err := l.w.Write(b)
l.size += size
return size, err
}
// WriteHeader writes the status code for the Response
func (l *responseLogger) WriteHeader(s int) {
l.ExtractGAPMetadata()
l.w.WriteHeader(s)
l.status = s
}
// Status returns the response status code
func (l *responseLogger) Status() int {
return l.status
}
// Size returns the response size
func (l *responseLogger) Size() int {
return l.size
}
// Flush sends any buffered data to the client
func (l *responseLogger) Flush() {
if flusher, ok := l.w.(http.Flusher); ok {
flusher.Flush()
}
}
// loggingHandler is the http.Handler implementation for LoggingHandler
type loggingHandler struct {
handler http.Handler
logger *log.Entry
}
// LoggingHandler provides an http.Handler which logs requests to the HTTP server
func LoggingHandler(h http.Handler) http.Handler {
return loggingHandler{
handler: h,
logger: log.WithField("component", "proxy-http-server"),
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}
}
func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
t := time.Now()
url := *req.URL
responseLogger := &responseLogger{w: w}
h.handler.ServeHTTP(responseLogger, req)
duration := float64(time.Since(t)) / float64(time.Second)
h.logger.WithFields(log.Fields{
"Client": req.RemoteAddr,
"Host": req.Host,
"Protocol": req.Proto,
"RequestDuration": fmt.Sprintf("%0.3f", duration),
"RequestMethod": req.Method,
"ResponseSize": responseLogger.Size(),
"StatusCode": responseLogger.Status(),
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"Timestamp": t,
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"Upstream": responseLogger.upstream,
"UserAgent": req.UserAgent(),
"Username": responseLogger.authInfo,
}).Info(url.RequestURI())
// logger.PrintReq(responseLogger.authInfo, responseLogger.upstream, req, url, t, , )
}