AuthProxy: Can now login with auth proxy and get a login token (#20175)

* AuthProxy: Can now login with auth proxy and get a login token

* added unit tests

* renamed setting and updated docs

* AuthProxy: minor tweak

* Fixed tests and namings

* spellfix

* fix

* remove unused setting, probably from merge conflict

* fix

pkg/setting/setting.go

@@ -143,13 +143,14 @@ var (
 	AnonymousOrgRole string
 
 	// Auth proxy settings
-	AuthProxyEnabled        bool
-	AuthProxyHeaderName     string
-	AuthProxyHeaderProperty string
-	AuthProxyAutoSignUp     bool
-	AuthProxySyncTtl        int
-	AuthProxyWhitelist      string
-	AuthProxyHeaders        map[string]string
+	AuthProxyEnabled          bool
+	AuthProxyHeaderName       string
+	AuthProxyHeaderProperty   string
+	AuthProxyAutoSignUp       bool
+	AuthProxyEnableLoginToken bool
+	AuthProxySyncTtl          int
+	AuthProxyWhitelist        string
+	AuthProxyHeaders          map[string]string
 
 	// Basic Auth
 	BasicAuthEnabled bool
@@ -854,6 +855,7 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 		return err
 	}
 	AuthProxyAutoSignUp = authProxy.Key("auto_sign_up").MustBool(true)
+	AuthProxyEnableLoginToken = authProxy.Key("enable_login_token").MustBool(false)
 
 	ldapSyncVal := authProxy.Key("ldap_sync_ttl").MustInt()
 	syncVal := authProxy.Key("sync_ttl").MustInt()