94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
package web
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/http/httputil"
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"net/url"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"goauthentik.io/internal/utils/web"
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)
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func (ws *WebServer) configureProxy() {
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// Reverse proxy to the application server
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u, _ := url.Parse("http://localhost:8000")
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director := func(req *http.Request) {
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req.URL.Scheme = u.Scheme
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req.URL.Host = u.Host
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if _, ok := req.Header["User-Agent"]; !ok {
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// explicitly disable User-Agent so it's not set to default value
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req.Header.Set("User-Agent", "")
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}
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if req.TLS != nil {
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req.Header.Set("X-Forwarded-Proto", "https")
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}
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ws.log.WithField("url", req.URL.String()).WithField("headers", req.Header).Trace("tracing request to backend")
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}
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rp := &httputil.ReverseProxy{Director: director}
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rp.ErrorHandler = ws.proxyErrorHandler
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rp.ModifyResponse = ws.proxyModifyResponse
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ws.m.PathPrefix("/outpost.goauthentik.io").HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if ws.ProxyServer != nil {
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before := time.Now()
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ws.ProxyServer.Handle(rw, r)
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Requests.With(prometheus.Labels{
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"dest": "embedded_outpost",
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}).Observe(float64(time.Since(before)))
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return
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}
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ws.proxyErrorHandler(rw, r, fmt.Errorf("proxy not running"))
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})
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ws.m.Path("/-/health/live/").HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.WriteHeader(204)
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})
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ws.m.PathPrefix("/").HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if !ws.p.IsRunning() {
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ws.proxyErrorHandler(rw, r, fmt.Errorf("authentik core not running yet"))
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return
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}
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before := time.Now()
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if ws.ProxyServer != nil {
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if ws.ProxyServer.HandleHost(rw, r) {
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Requests.With(prometheus.Labels{
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"dest": "embedded_outpost",
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}).Observe(float64(time.Since(before)))
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return
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}
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}
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Requests.With(prometheus.Labels{
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"dest": "py",
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}).Observe(float64(time.Since(before)))
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ws.log.WithField("host", web.GetHost(r)).Trace("routing to application server")
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rp.ServeHTTP(rw, r)
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})
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}
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func (ws *WebServer) proxyErrorHandler(rw http.ResponseWriter, req *http.Request, err error) {
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ws.log.WithError(err).Warning("failed to proxy to backend")
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rw.WriteHeader(http.StatusBadGateway)
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em := fmt.Sprintf("failed to connect to authentik backend: %v", err)
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if !ws.p.IsRunning() {
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em = "authentik starting..."
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}
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// return json if the client asks for json
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if req.Header.Get("Accept") == "application/json" {
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eem, _ := json.Marshal(map[string]string{
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"error": em,
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})
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em = string(eem)
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}
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_, err = rw.Write([]byte(em))
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if err != nil {
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ws.log.WithError(err).Warning("failed to write error message")
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}
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}
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func (ws *WebServer) proxyModifyResponse(r *http.Response) error {
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r.Header.Set("X-Powered-By", "authentik")
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r.Header.Del("Server")
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return nil
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}
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