outposts/ldap: add ability to use multiple providers on the same outpost

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

outpost/pkg/ldap/ldap.go

@@ -1,9 +1,6 @@
 package ldap
 
 import (
-	"fmt"
-	"strings"
-
 	log "github.com/sirupsen/logrus"
 	"goauthentik.io/outpost/pkg/ak"
 
@@ -13,33 +10,35 @@ import (
 const GroupObjectClass = "group"
 const UserObjectClass = "user"
 
-type LDAPServer struct {
+type ProviderInstance struct {
 	BaseDN string
 
-	userDN  string
-	groupDN string
+	UserDN  string
+	GroupDN string
 
+	appSlug  string
+	flowSlug string
+	s        *LDAPServer
+	log      *log.Entry
+}
+
+type LDAPServer struct {
 	s   *ldap.Server
 	log *log.Entry
 	ac  *ak.APIController
 
-	// TODO: Make configurable
-	flowSlug string
-	appSlug  string
+	providers []*ProviderInstance
 }
 
 func NewServer(ac *ak.APIController) *LDAPServer {
 	s := ldap.NewServer()
 	s.EnforceLDAP = true
 	ls := &LDAPServer{
-		s:   s,
-		log: log.WithField("logger", "ldap-server"),
-		ac:  ac,
-
-		BaseDN: "DC=ldap,DC=goauthentik,DC=io",
+		s:         s,
+		log:       log.WithField("logger", "ldap-server"),
+		ac:        ac,
+		providers: []*ProviderInstance{},
 	}
-	ls.userDN = strings.ToLower(fmt.Sprintf("cn=users,%s", ls.BaseDN))
-	ls.groupDN = strings.ToLower(fmt.Sprintf("cn=groups,%s", ls.BaseDN))
 	s.BindFunc("", ls)
 	s.SearchFunc("", ls)
 	return ls