Remove route when single pages become unpublished (#4318)

#### What type of PR is this?

/kind bug
/area core
/milestone 2.8.x

#### What this PR does / why we need it:

- Remove route when single pages become unpublished
- Add some unit tests against the change.

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/4309

#### Special notes for your reviewer:

1. Create a single page with slug name `about.html` and publish it.
2. Create a static file `about.html` into static folder`${halo.work-dir}/static/`.
3. Try to request <http://localhost:8090/about.html> and check the result.
4. Unpublish the single page and then do the step 3 again.

#### Does this PR introduce a user-facing change?

```release-note
修复页面取消发布后访问仍然出现页面未找到错误。
```

application/src/main/java/run/halo/app/theme/router/SinglePageRoute.java

@@ -101,15 +101,21 @@ public class SinglePageRoute
     public Result reconcile(Request request) {
         client.fetch(SinglePage.class, request.name())
             .ifPresent(page -> {
-                if (ExtensionOperator.isDeleted(page)
-                    || BooleanUtils.isTrue(page.getSpec().getDeleted())) {
-                    quickRouteMap.remove(NameSlugPair.from(page));
+                var nameSlugPair = NameSlugPair.from(page);
+                if (ExtensionOperator.isDeleted(page)) {
+                    quickRouteMap.remove(nameSlugPair);
                     return;
                 }
-                // put new one
-                quickRouteMap.entrySet()
-                    .removeIf(entry -> entry.getKey().name().equals(request.name()));
-                quickRouteMap.put(NameSlugPair.from(page), handlerFunction(request.name()));
+                if (BooleanUtils.isTrue(page.getSpec().getDeleted())) {
+                    quickRouteMap.remove(nameSlugPair);
+                } else {
+                    // put new one
+                    if (page.isPublished()) {
+                        quickRouteMap.put(nameSlugPair, handlerFunction(request.name()));
+                    } else {
+                        quickRouteMap.remove(nameSlugPair);
+                    }
+                }
             });
         return new Result(false, null);
     }

application/src/test/java/run/halo/app/theme/router/SinglePageRouteTest.java

@@ -2,16 +2,24 @@ package run.halo.app.theme.router;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import java.net.URI;
+import java.time.Instant;
+import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
+import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -31,8 +39,10 @@ import org.springframework.web.util.UriUtils;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 import run.halo.app.core.extension.content.SinglePage;
+import run.halo.app.extension.ExtensionClient;
 import run.halo.app.extension.GroupVersionKind;
 import run.halo.app.extension.Metadata;
+import run.halo.app.extension.controller.Reconciler;
 import run.halo.app.theme.DefaultTemplateEnum;
 import run.halo.app.theme.finders.SinglePageFinder;
 import run.halo.app.theme.finders.vo.SinglePageVo;
@@ -48,16 +58,19 @@ import run.halo.app.theme.router.SinglePageRoute.NameSlugPair;
 class SinglePageRouteTest {
 
     @Mock
-    private ViewNameResolver viewNameResolver;
+    ViewNameResolver viewNameResolver;
 
     @Mock
-    private SinglePageFinder singlePageFinder;
+    SinglePageFinder singlePageFinder;
 
     @Mock
-    protected ViewResolver viewResolver;
+    ViewResolver viewResolver;
+
+    @Mock
+    ExtensionClient client;
 
     @InjectMocks
-    private SinglePageRoute singlePageRoute;
+    SinglePageRoute singlePageRoute;
 
     @Test
     void handlerFunction() {
@@ -130,4 +143,102 @@ class SinglePageRouteTest {
             .verifyComplete();
     }
 
+    @Nested
+    class SinglePageReconcilerTest {
+
+        @Test
+        void shouldRemoveRouteIfSinglePageUnpublished() {
+            var name = "fake-single-page";
+            var page = newSinglePage(name, false);
+            when(client.fetch(SinglePage.class, name)).thenReturn(
+                Optional.of(page));
+
+            var routeMap = Mockito.<Map<NameSlugPair, HandlerFunction<ServerResponse>>>mock(
+                invocation -> new HashMap<NameSlugPair, HandlerFunction<ServerResponse>>());
+            singlePageRoute.setQuickRouteMap(routeMap);
+            var result = singlePageRoute.reconcile(new Reconciler.Request(name));
+            assertNotNull(result);
+            assertFalse(result.reEnqueue());
+            verify(client).fetch(SinglePage.class, name);
+            verify(routeMap).remove(NameSlugPair.from(page));
+        }
+
+        @Test
+        void shouldAddRouteIfSinglePagePublished() {
+            var name = "fake-single-page";
+            var page = newSinglePage(name, true);
+            when(client.fetch(SinglePage.class, name)).thenReturn(
+                Optional.of(page));
+
+            var routeMap = Mockito.<Map<NameSlugPair, HandlerFunction<ServerResponse>>>mock(
+                invocation -> new HashMap<NameSlugPair, HandlerFunction<ServerResponse>>());
+            singlePageRoute.setQuickRouteMap(routeMap);
+            var result = singlePageRoute.reconcile(new Reconciler.Request(name));
+            assertNotNull(result);
+            assertFalse(result.reEnqueue());
+            verify(client).fetch(SinglePage.class, name);
+            verify(routeMap).put(eq(NameSlugPair.from(page)), any());
+        }
+
+        @Test
+        void shouldRemoveRouteIfSinglePageDeleted() {
+            var name = "fake-single-page";
+            var page = newDeletedSinglePage(name);
+            when(client.fetch(SinglePage.class, name)).thenReturn(
+                Optional.of(page));
+
+            var routeMap = Mockito.<Map<NameSlugPair, HandlerFunction<ServerResponse>>>mock(
+                invocation -> new HashMap<NameSlugPair, HandlerFunction<ServerResponse>>());
+            singlePageRoute.setQuickRouteMap(routeMap);
+            var result = singlePageRoute.reconcile(new Reconciler.Request(name));
+            assertNotNull(result);
+            assertFalse(result.reEnqueue());
+            verify(client).fetch(SinglePage.class, name);
+            verify(routeMap).remove(NameSlugPair.from(page));
+        }
+
+        @Test
+        void shouldRemoveRouteIfSinglePageRecycled() {
+            var name = "fake-single-page";
+            var page = newRecycledSinglePage(name);
+            when(client.fetch(SinglePage.class, name)).thenReturn(
+                Optional.of(page));
+
+            var routeMap = Mockito.<Map<NameSlugPair, HandlerFunction<ServerResponse>>>mock(
+                invocation -> new HashMap<NameSlugPair, HandlerFunction<ServerResponse>>());
+            singlePageRoute.setQuickRouteMap(routeMap);
+            var result = singlePageRoute.reconcile(new Reconciler.Request(name));
+            assertNotNull(result);
+            assertFalse(result.reEnqueue());
+            verify(client).fetch(SinglePage.class, name);
+            verify(routeMap).remove(NameSlugPair.from(page));
+        }
+
+
+        SinglePage newSinglePage(String name, boolean published) {
+            var metadata = new Metadata();
+            metadata.setName(name);
+            var page = new SinglePage();
+            page.setMetadata(metadata);
+            var spec = new SinglePage.SinglePageSpec();
+            spec.setSlug("/fake-slug");
+            page.setSpec(spec);
+            var status = new SinglePage.SinglePageStatus();
+            page.setStatus(status);
+            SinglePage.changePublishedState(page, published);
+            return page;
+        }
+
+        SinglePage newDeletedSinglePage(String name) {
+            var page = newSinglePage(name, true);
+            page.getMetadata().setDeletionTimestamp(Instant.now());
+            return page;
+        }
+
+        SinglePage newRecycledSinglePage(String name) {
+            var page = newSinglePage(name, true);
+            page.getSpec().setDeleted(true);
+            return page;
+        }
+    }
 }