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oauth2-proxy/logging_handler.go

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// largely adapted from https://github.com/gorilla/handlers/blob/master/handlers.go
// to add logging of request duration as last value (and drop referrer)
package main
import (
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"bufio"
"errors"
"net"
"net/http"
"time"
"github.com/pusher/oauth2_proxy/logger"
)
// 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()
}
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// 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 teh response size
func (l *responseLogger) Size() int {
return l.size
}
func (l *responseLogger) Flush() {
if flusher, ok := l.w.(http.Flusher); ok {
flusher.Flush()
}
}
// loggingHandler is the http.Handler implementation for LoggingHandlerTo and its friends
type loggingHandler struct {
handler http.Handler
}
// LoggingHandler provides an http.Handler which logs requests to the HTTP server
func LoggingHandler(h http.Handler) http.Handler {
return loggingHandler{
handler: h,
}
}
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)
logger.PrintReq(responseLogger.authInfo, responseLogger.upstream, req, url, t, responseLogger.Status(), responseLogger.Size())
}