Resolve "WebHookService doesn't handle user info with nil passwords"

app/services/web_hook_service.rb

@@ -82,7 +82,7 @@ class WebHookService
     post_url = hook.url.gsub("#{parsed_url.userinfo}@", '')
     basic_auth = {
       username: CGI.unescape(parsed_url.user),
-      password: CGI.unescape(parsed_url.password)
+      password: CGI.unescape(parsed_url.password.presence || '')
     }
     make_request(post_url, basic_auth)
   end

changelogs/unreleased/46571-webhooks-nil-password.yml

+---
+title: Fix webhook error when password is not present
+merge_request: 19945
+author: Jan Beckmann
+type: fixed

spec/services/web_hook_service_spec.rb

@@ -60,6 +60,36 @@ describe WebHookService do
       ).once
     end
 
+    context 'when auth credentials are present' do
+      let(:url)  {'https://example.org'}
+      let(:project_hook) { create(:project_hook, url: 'https://demo:demo@example.org/') }
+
+      it 'uses the credentials' do
+        WebMock.stub_request(:post, url)
+
+        service_instance.execute
+
+        expect(WebMock).to have_requested(:post, url).with(
+          headers: headers.merge('Authorization' => 'Basic ZGVtbzpkZW1v')
+        ).once
+      end
+    end
+
+    context 'when auth credentials are partial present' do
+      let(:url)  {'https://example.org'}
+      let(:project_hook) { create(:project_hook, url: 'https://demo@example.org/') }
+
+      it 'uses the credentials anyways' do
+        WebMock.stub_request(:post, url)
+
+        service_instance.execute
+
+        expect(WebMock).to have_requested(:post, url).with(
+          headers: headers.merge('Authorization' => 'Basic ZGVtbzo=')
+        ).once
+      end
+    end
+
     it 'catches exceptions' do
       WebMock.stub_request(:post, project_hook.url).to_raise(StandardError.new('Some error'))