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http.go
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http.go
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package services
import (
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
)
// HTTP server object (all fields are required).
type HTTP struct {
Port int16
Backend string
SecurePort int16
SecureBackend string
Cert string
Key string
TLSVersion string
}
func getTLSVersion(state *tls.ConnectionState) string {
switch state.Version {
case tls.VersionTLS10:
return "v1.0"
case tls.VersionTLS11:
return "v1.1"
case tls.VersionTLS12:
return "v1.2"
// TLS v1.3 is experimental.
case 0x0304:
return "v1.3"
default:
return "unknown"
}
}
// Start initializes the HTTP server.
func (h *HTTP) Start() <-chan bool {
log.Printf("HTTP: %s listening on %d/%d", h.Backend, h.Port, h.SecurePort)
mux := http.NewServeMux()
mux.HandleFunc("/", h.handler)
exited := make(chan bool)
go func() {
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%v", h.Port), mux))
close(exited)
}()
go func() {
s := &http.Server{
Addr: fmt.Sprintf(":%v", h.SecurePort),
Handler: mux,
}
log.Fatal(s.ListenAndServeTLS(h.Cert, h.Key))
close(exited)
}()
return exited
}
// Helpers
func lower(m map[string][]string) (result map[string][]string) {
result = make(map[string][]string)
for k, v := range m {
result[strings.ToLower(k)] = v
}
return result
}
func (h *HTTP) handler(w http.ResponseWriter, r *http.Request) {
// Assume we're the clear side of the world.
backend := h.Backend
conntype := "CLR"
var request = make(map[string]interface{})
var url = make(map[string]interface{})
request["url"] = url
url["fragment"] = r.URL.Fragment
url["host"] = r.URL.Host
url["opaque"] = r.URL.Opaque
url["path"] = r.URL.Path
url["query"] = r.URL.Query()
url["rawQuery"] = r.URL.RawQuery
url["scheme"] = r.URL.Scheme
if r.URL.User != nil {
url["username"] = r.URL.User.Username()
pw, ok := r.URL.User.Password()
if ok {
url["password"] = pw
}
}
request["method"] = r.Method
request["headers"] = lower(r.Header)
request["host"] = r.Host
var tlsrequest = make(map[string]interface{})
request["tls"] = tlsrequest
tlsrequest["enabled"] = r.TLS != nil
if r.TLS != nil {
// We're the secure side of the world, I guess.
backend = h.SecureBackend
conntype = "TLS"
tlsrequest["negotiated-protocol"] = r.TLS.NegotiatedProtocol
tlsrequest["server-name"] = r.TLS.ServerName
tlsrequest["negotiated-protocol-version"] = getTLSVersion(r.TLS)
}
// respond with the requested status
status := r.Header.Get("Requested-Status")
if status == "" {
status = "200"
}
statusCode, err := strconv.Atoi(status)
if err != nil {
log.Print(err)
statusCode = 500
}
// copy the requested headers into the response
headers, ok := r.Header["Requested-Header"]
if ok {
for _, header := range headers {
canonical := http.CanonicalHeaderKey(header)
value, ok := r.Header[canonical]
if ok {
w.Header()[canonical] = value
}
}
}
if b, _ := ioutil.ReadAll(r.Body); b != nil {
body := string(b)
log.Printf("received body: %s", body)
w.Header()[http.CanonicalHeaderKey("Auth-Request-Body")] = []string{body}
}
defer r.Body.Close()
cookies, ok := r.Header["Requested-Cookie"]
if ok {
for _, v := range strings.Split(cookies[0], ",") {
val := strings.Trim(v, " ")
http.SetCookie(w, &http.Cookie{
Name: val,
Value: val,
})
}
}
// If they asked for a specific location to be returned, handle that too.
location, ok := r.Header["Requested-Location"]
if ok {
w.Header()[http.CanonicalHeaderKey("Location")] = location
}
addExtauth := os.Getenv("INCLUDE_EXTAUTH_HEADER")
if len(addExtauth) > 0 {
extauth := make(map[string]interface{})
extauth["request"] = request
extauth["resp_headers"] = lower(w.Header())
eaJSON, err := json.Marshal(extauth)
if err != nil {
eaJSON = []byte(fmt.Sprintf("err: %v", err))
}
eaArray := make([]string, 1, 1)
eaArray[0] = string(eaJSON)
w.Header()[http.CanonicalHeaderKey("extauth")] = eaArray
}
// Check header and delay response.
if h, ok := r.Header["Requested-Backend-Delay"]; ok {
if v, err := strconv.Atoi(h[0]); err == nil {
log.Printf("Delaying response by %v ms", v)
time.Sleep(time.Duration(v) * time.Millisecond)
}
}
// Set date response header.
w.Header().Set("Date", time.Now().Format(time.RFC1123))
w.WriteHeader(statusCode)
// Write out all request/response information
var response = make(map[string]interface{})
response["headers"] = lower(w.Header())
var body = make(map[string]interface{})
body["backend"] = backend
body["request"] = request
body["response"] = response
b, err := json.MarshalIndent(body, "", " ")
if err != nil {
b = []byte(fmt.Sprintf("Error: %v", err))
}
log.Printf("%s (%s): writing response HTTP %v", backend, conntype, statusCode)
w.Write(b)
}