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package middleware
// Derived from from the Goa project, MIT Licensed
// https://github.com/goadesign/goa/blob/v3/http/middleware/debug.go
import (
"bufio"
"bytes"
"fmt"
"io"
"net"
"net/http"
"net/http/httputil"
"sort"
"strings"
)
// responseDupper tees the response to a buffer and a response writer.
type responseDupper struct {
http.ResponseWriter
Buffer *bytes.Buffer
Status int
}
// Dumper returns a debug middleware which prints detailed information about
// incoming requests and outgoing responses including all headers, parameters
// and bodies.
func Dumper(w io.Writer) func(http.Handler) http.Handler {
return func(h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
buf := &bytes.Buffer{}
// Request ID
rid := r.Context().Value(RequestIDKey)
// Dump request
bd, err := httputil.DumpRequest(r, true)
if err != nil {
buf.WriteString(fmt.Sprintf("[%s] Error dumping request for debugging: %s\n", rid, err))
}
sc := bufio.NewScanner(bytes.NewBuffer(bd))
sc.Split(bufio.ScanLines)
for sc.Scan() {
buf.WriteString(fmt.Sprintf("> [%s] ", rid))
buf.WriteString(sc.Text() + "\n")
}
w.Write(buf.Bytes())
buf.Reset()
// Dump Response
dupper := &responseDupper{ResponseWriter: rw, Buffer: &bytes.Buffer{}}
h.ServeHTTP(dupper, r)
// Response Status
buf.WriteString(fmt.Sprintf("< [%s] %d %s\n", rid, dupper.Status, http.StatusText(dupper.Status)))
// Response Headers
keys := make([]string, len(dupper.Header()))
i := 0
for k := range dupper.Header() {
keys[i] = k
i++
}
sort.Strings(keys)
for _, k := range keys {
buf.WriteString(fmt.Sprintf("< [%s] %s: %s\n", rid, k, strings.Join(dupper.Header()[k], ", ")))
}
// Response Body
if dupper.Buffer.Len() > 0 {
buf.WriteString(fmt.Sprintf("< [%s]\n", rid))
sc = bufio.NewScanner(dupper.Buffer)
sc.Split(bufio.ScanLines)
for sc.Scan() {
buf.WriteString(fmt.Sprintf("< [%s] ", rid))
buf.WriteString(sc.Text() + "\n")
}
}
w.Write(buf.Bytes())
})
}
}
// Write writes the data to the buffer and connection as part of an HTTP reply.
func (r *responseDupper) Write(b []byte) (int, error) {
r.Buffer.Write(b)
return r.ResponseWriter.Write(b)
}
// WriteHeader records the status and sends an HTTP response header with status code.
func (r *responseDupper) WriteHeader(s int) {
r.Status = s
r.ResponseWriter.WriteHeader(s)
}
// Hijack supports the http.Hijacker interface.
func (r *responseDupper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hijacker, ok := r.ResponseWriter.(http.Hijacker); ok {
return hijacker.Hijack()
}
return nil, nil, fmt.Errorf("dumper middleware: inner ResponseWriter cannot be hijacked: %T", r.ResponseWriter)
}
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