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package main
import (
"io"
"strings"
"net"
"net/http"
"net/url"
"sanine.net/git/phlox/auth"
"sanine.net/git/phlox/config"
"sanine.net/git/phlox/page"
log "github.com/sirupsen/logrus"
)
type Endpoint struct {
Path string
Origin *url.URL
}
func addEndpoint(s *auth.Sessions, pages page.Pages, e config.Endpoint) {
log.Infof("proxying endpoint %v to %v", e.Path, e.Address)
origin, err := url.Parse(e.Address)
if err != nil {
log.Fatal(err)
}
end := Endpoint{
Path: e.Path,
Origin: origin,
}
http.HandleFunc(e.Path, func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Location", e.Path + "/")
w.WriteHeader(http.StatusPermanentRedirect)
})
http.HandleFunc(e.Path + "/", func(w http.ResponseWriter, r *http.Request) {
log.Infof("REQ: %v", r.URL.Path)
proxy(w, r, s, pages, end)
})
}
func proxy(w http.ResponseWriter, r *http.Request, s *auth.Sessions, pages page.Pages, end Endpoint) {
ok := authenticateRequest(r, s)
if !ok {
w.Header().Set("Location", "/phlox/login")
w.WriteHeader(http.StatusTemporaryRedirect)
return
}
response := proxyRequest(w, r, pages, end)
if response != nil {
proxyResponse(w, response)
}
}
func proxyRequest(w http.ResponseWriter, r *http.Request, pages page.Pages, end Endpoint) *http.Response {
// configure host address
r.Host = end.Origin.Host
r.URL.Host = end.Origin.Host
// strip proxy endpoint path from request path
r.URL.Path = strings.TrimPrefix(r.URL.Path, end.Path)
// set X-Forwarded-For
forwardedFor, _, _ := net.SplitHostPort(r.RemoteAddr)
r.Header.Set("X-Forwarded-For", forwardedFor)
// misc request cleanups
r.URL.Scheme = end.Origin.Scheme
r.RequestURI = ""
// make request
response, err := http.DefaultClient.Do(r)
if err != nil {
pages.ServeError500(w)
log.Error(err)
return nil
}
return response
}
func proxyResponse(w http.ResponseWriter, response *http.Response) {
// copy header
for key, values := range response.Header {
for _, value := range values {
w.Header().Add(key, value)
}
}
// get trailer keys
trailerKeys := []string{}
for key := range response.Trailer {
trailerKeys = append(trailerKeys, key)
}
if (len(trailerKeys) > 0) {
w.Header().Set("Trailer", strings.Join(trailerKeys, ","))
}
w.WriteHeader(response.StatusCode)
// copy body to client
io.Copy(w, response.Body)
// write trailers
for key, values := range response.Trailer {
for _, value := range values {
w.Header().Set(key, value)
}
}
}
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