105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
// largely adapted from https://github.com/gorilla/handlers/blob/master/handlers.go
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// to add logging of request duration as last value (and drop referrer)
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package main
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import (
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"net/http"
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"time"
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"github.com/pusher/oauth2_proxy/logger"
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)
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// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP status
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// code and body size
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type responseLogger struct {
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w http.ResponseWriter
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status int
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size int
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upstream string
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authInfo string
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}
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// Header returns the ResponseWriter's Header
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func (l *responseLogger) Header() http.Header {
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return l.w.Header()
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}
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// Support Websocket
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func (l *responseLogger) Hijack() (rwc net.Conn, buf *bufio.ReadWriter, err error) {
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if hj, ok := l.w.(http.Hijacker); ok {
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return hj.Hijack()
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}
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return nil, nil, errors.New("http.Hijacker is not available on writer")
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}
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// ExtractGAPMetadata extracts and removes GAP headers from the ResponseWriter's
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// Header
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func (l *responseLogger) ExtractGAPMetadata() {
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upstream := l.w.Header().Get("GAP-Upstream-Address")
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if upstream != "" {
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l.upstream = upstream
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l.w.Header().Del("GAP-Upstream-Address")
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}
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authInfo := l.w.Header().Get("GAP-Auth")
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if authInfo != "" {
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l.authInfo = authInfo
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l.w.Header().Del("GAP-Auth")
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}
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}
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// Write writes the response using the ResponseWriter
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func (l *responseLogger) Write(b []byte) (int, error) {
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if l.status == 0 {
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// The status will be StatusOK if WriteHeader has not been called yet
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l.status = http.StatusOK
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}
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l.ExtractGAPMetadata()
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size, err := l.w.Write(b)
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l.size += size
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return size, err
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}
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// WriteHeader writes the status code for the Response
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func (l *responseLogger) WriteHeader(s int) {
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l.ExtractGAPMetadata()
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l.w.WriteHeader(s)
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l.status = s
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}
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// Status returns the response status code
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func (l *responseLogger) Status() int {
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return l.status
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}
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// Size returns teh response size
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func (l *responseLogger) Size() int {
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return l.size
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}
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func (l *responseLogger) Flush() {
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if flusher, ok := l.w.(http.Flusher); ok {
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flusher.Flush()
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}
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}
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// loggingHandler is the http.Handler implementation for LoggingHandlerTo and its friends
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type loggingHandler struct {
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handler http.Handler
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}
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// LoggingHandler provides an http.Handler which logs requests to the HTTP server
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func LoggingHandler(h http.Handler) http.Handler {
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return loggingHandler{
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handler: h,
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}
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}
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func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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t := time.Now()
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url := *req.URL
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responseLogger := &responseLogger{w: w}
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h.handler.ServeHTTP(responseLogger, req)
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logger.PrintReq(responseLogger.authInfo, responseLogger.upstream, req, url, t, responseLogger.Status(), responseLogger.Size())
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}
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