Fix 500 on Gitea importer

- When entering blocked URLs Gitea importer
  returns 500 error instead of a user friendly error
- Thic change fixes 500 error and adds more user
  friendly error indicating what went wrong

app/controllers/import/gitea_controller.rb

@@ -16,7 +16,13 @@ class Import::GiteaController < Import::GithubController
 
   # Must be defined or it will 404
   def status
-    super
+    if blocked_url?
+      session[access_token_key] = nil
+
+      redirect_to new_import_url, alert: _('Specified URL cannot be used.')
+    else
+      super
+    end
   end
 
   private
@@ -54,4 +60,19 @@ class Import::GiteaController < Import::GithubController
   def client_options
     { host: provider_url, api_version: 'v1' }
   end
+
+  def blocked_url?
+    Gitlab::UrlBlocker.blocked_url?(
+      provider_url,
+      {
+        allow_localhost: allow_local_requests?,
+        allow_local_network: allow_local_requests?,
+        schemes: %w(http https)
+      }
+    )
+  end
+
+  def allow_local_requests?
+    Gitlab::CurrentSettings.allow_local_requests_from_web_hooks_and_services?
+  end
 end

changelogs/unreleased/georgekoltsov-fix-500-on-gitea-importer.yml

+---
+title: Fix 500 Error when using Gitea Importer
+merge_request: 26166
+author:
+type: fixed

locale/gitlab.pot

@@ -18466,6 +18466,9 @@ msgstr ""
 msgid "Specific Runners"
 msgstr ""
 
+msgid "Specified URL cannot be used."
+msgstr ""
+
 msgid "Specify an e-mail address regex pattern to identify default internal users."
 msgstr ""
 

spec/controllers/import/gitea_controller_spec.rb

@@ -28,10 +28,24 @@ describe Import::GiteaController do
 
   describe "GET status" do
     it_behaves_like 'a GitHub-ish import controller: GET status' do
+      let(:extra_assign_expectations) { { gitea_host_url: host_url } }
+
       before do
         assign_host_url
       end
-      let(:extra_assign_expectations) { { gitea_host_url: host_url } }
+
+      context 'when host url is local or not http' do
+        %w[https://localhost:3000 http://192.168.0.1 ftp://testing].each do |url|
+          let(:host_url) { url }
+
+          it 'denies network request' do
+            get :status, format: :json
+
+            expect(controller).to redirect_to(new_import_url)
+            expect(flash[:alert]).to eq('Specified URL cannot be used.')
+          end
+        end
+      end
     end
   end