outposts: initial ldap outpost implementation

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

outpost/cmd/ldap/server.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"net/url"
+	"os"
+	"os/signal"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"goauthentik.io/outpost/pkg/ak"
+	"goauthentik.io/outpost/pkg/ldap"
+)
+
+const helpMessage = `authentik ldap
+
+Required environment variables:
+- AUTHENTIK_HOST: URL to connect to (format "http://authentik.company")
+- AUTHENTIK_TOKEN: Token to authenticate with
+- AUTHENTIK_INSECURE: Skip SSL Certificate verification`
+
+func main() {
+	log.SetLevel(log.DebugLevel)
+	pbURL, found := os.LookupEnv("AUTHENTIK_HOST")
+	if !found {
+		fmt.Println("env AUTHENTIK_HOST not set!")
+		fmt.Println(helpMessage)
+		os.Exit(1)
+	}
+	pbToken, found := os.LookupEnv("AUTHENTIK_TOKEN")
+	if !found {
+		fmt.Println("env AUTHENTIK_TOKEN not set!")
+		fmt.Println(helpMessage)
+		os.Exit(1)
+	}
+
+	pbURLActual, err := url.Parse(pbURL)
+	if err != nil {
+		fmt.Println(err)
+		fmt.Println(helpMessage)
+		os.Exit(1)
+	}
+
+	rand.Seed(time.Now().UnixNano())
+
+	ac := ak.NewAPIController(*pbURLActual, pbToken)
+
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, os.Interrupt)
+
+	ac.Server = ldap.NewServer(ac)
+
+	ac.Start()
+
+	for {
+		select {
+		case <-interrupt:
+			ac.Shutdown()
+			os.Exit(0)
+		}
+	}
+}