Allow custom redirect for landing page (#19324)

* Allow custom redirect for landing page

* Update modules/setting/setting.go

Co-authored-by: delvh <dev.lh@web.de>

* fix lint

* one option

Co-authored-by: delvh <dev.lh@web.de>

custom/conf/app.example.ini

@@ -237,7 +237,7 @@ RUN_MODE = ; prod
 ;; PPROF_DATA_PATH, use an absolute path when you start gitea as service
 ;PPROF_DATA_PATH = data/tmp/pprof
 ;;
-;; Landing page, can be "home", "explore", "organizations" or "login"
+;; Landing page, can be "home", "explore", "organizations", "login", or any URL such as "/org/repo" or even "https://anotherwebsite.com"
 ;; The "login" choice is not a security measure but just a UI flow change, use REQUIRE_SIGNIN_VIEW to force users to log in.
 ;LANDING_PAGE = home
 ;;

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -300,8 +300,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `ENABLE_GZIP`: **false**: Enable gzip compression for runtime-generated content, static resources excluded.
 - `ENABLE_PPROF`: **false**: Application profiling (memory and cpu). For "web" command it listens on localhost:6060. For "serv" command it dumps to disk at `PPROF_DATA_PATH` as `(cpuprofile|memprofile)_<username>_<temporary id>`
 - `PPROF_DATA_PATH`: **data/tmp/pprof**: `PPROF_DATA_PATH`, use an absolute path when you start Gitea as service
-- `LANDING_PAGE`: **home**: Landing page for unauthenticated users \[home, explore, organizations, login\].
-
+- `LANDING_PAGE`: **home**: Landing page for unauthenticated users \[home, explore, organizations, login, **custom**\]. Where custom would instead be any URL such as "/org/repo" or even "https://anotherwebsite.com"
 - `LFS_START_SERVER`: **false**: Enables Git LFS support.
 - `LFS_CONTENT_PATH`: **%(APP_DATA_PATH)/lfs**: Default LFS content path. (if it is on local storage.) **DEPRECATED** use settings in `[lfs]`.
 - `LFS_JWT_SECRET`: **\<empty\>**: LFS authentication secret, change this a unique string.

modules/setting/setting.go

@@ -106,6 +106,7 @@ var (
 	StaticCacheTime      time.Duration
 	EnableGzip           bool
 	LandingPageURL       LandingPage
+	LandingPageCustom    string
 	UnixSocketPermission uint32
 	EnablePprof          bool
 	PprofDataPath        string
@@ -776,15 +777,19 @@ func loadFromConf(allowEmpty bool, extraConfig string) {
 		PprofDataPath = filepath.Join(AppWorkPath, PprofDataPath)
 	}
 
-	switch sec.Key("LANDING_PAGE").MustString("home") {
+	landingPage := sec.Key("LANDING_PAGE").MustString("home")
+	switch landingPage {
 	case "explore":
 		LandingPageURL = LandingPageExplore
 	case "organizations":
 		LandingPageURL = LandingPageOrganizations
 	case "login":
 		LandingPageURL = LandingPageLogin
-	default:
+	case "":
+	case "home":
 		LandingPageURL = LandingPageHome
+	default:
+		LandingPageURL = LandingPage(landingPage)
 	}
 
 	if len(SSH.Domain) == 0 {