providers/radius: simple radius outpost (#1796)

* initial implementation

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>
Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* cleanup

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add migrations

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix web

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* minor fixes

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* use search-select

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* update locale

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fixup

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix ip with port being sent to delegated ip

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add radius tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* update docs

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>
Signed-off-by: Jens Langhammer <jens@goauthentik.io>

internal/outpost/radius/metrics/metrics.go

@@ -0,0 +1,41 @@
+package metrics
+
+import (
+	"net/http"
+
+	log "github.com/sirupsen/logrus"
+	"goauthentik.io/internal/config"
+	"goauthentik.io/internal/utils/sentry"
+
+	"github.com/gorilla/mux"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+var (
+	Requests = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name: "authentik_outpost_radius_requests",
+		Help: "The total number of successful requests",
+	}, []string{"outpost_name", "app"})
+	RequestsRejected = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "authentik_outpost_radius_requests_rejected",
+		Help: "Total number of rejected requests",
+	}, []string{"outpost_name", "reason", "app"})
+)
+
+func RunServer() {
+	m := mux.NewRouter()
+	l := log.WithField("logger", "authentik.outpost.metrics")
+	m.Use(sentry.SentryNoSampleMiddleware)
+	m.HandleFunc("/outpost.goauthentik.io/ping", func(rw http.ResponseWriter, r *http.Request) {
+		rw.WriteHeader(204)
+	})
+	m.Path("/metrics").Handler(promhttp.Handler())
+	listen := config.Get().Listen.Metrics
+	l.WithField("listen", listen).Info("Starting Metrics server")
+	err := http.ListenAndServe(listen, m)
+	if err != nil {
+		l.WithError(err).Warning("Failed to start metrics listener")
+	}
+}