Refactor AppURL usage (#30885)

Fix #30883
Fix #29591

---------

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

routers/common/middleware.go

@@ -4,11 +4,13 @@
 package common
 
 import (
+	go_context "context"
 	"fmt"
 	"net/http"
 	"strings"
 
 	"code.gitea.io/gitea/modules/cache"
+	"code.gitea.io/gitea/modules/httplib"
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web/middleware"
@@ -34,6 +36,7 @@ func ProtocolMiddlewares() (handlers []any) {
 				}
 			}()
 			req = req.WithContext(middleware.WithContextData(req.Context()))
+			req = req.WithContext(go_context.WithValue(req.Context(), httplib.RequestContextKey, req))
 			next.ServeHTTP(resp, req)
 		})
 	})

routers/common/redirect.go

@@ -17,7 +17,7 @@ func FetchRedirectDelegate(resp http.ResponseWriter, req *http.Request) {
 	// The typical page is "issue comment" page. The backend responds "/owner/repo/issues/1#comment-2",
 	// then frontend needs this delegate to redirect to the new location with hash correctly.
 	redirect := req.PostFormValue("redirect")
-	if !httplib.IsCurrentGiteaSiteURL(redirect) {
+	if !httplib.IsCurrentGiteaSiteURL(req.Context(), redirect) {
 		resp.WriteHeader(http.StatusBadRequest)
 		return
 	}