fix: post page size configuration not work (#3413)

#### What type of PR is this?
/kind bug
/area core
/milestone 2.3.x
#### What this PR does / why we need it:
修复文章列表分页配置取值错误的问题
此问题为 #3300 PR 引入，由于改动较大遗漏了这点没测试到。

how to test it？
修改文章设置中的大小，查看主题端分页是否符合预期：
包括首页，归档页，标签文章页，分类文章页。
<img width="575" alt="image" src="https://user-images.githubusercontent.com/38999863/221574440-eeec9c27-57ab-46d1-823f-7cc076fb2b54.png">

#### Which issue(s) this PR fixes:
Fixes #3411

#### Special notes for your reviewer:
/cc @halo-dev/sig-halo 
#### Does this PR introduce a user-facing change?

```release-note
None
```

src/main/java/run/halo/app/theme/router/factories/ArchiveRouteFactory.java

@@ -19,6 +19,7 @@ import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.function.server.ServerResponse;
 import reactor.core.publisher.Mono;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 import run.halo.app.infra.utils.JsonUtils;
 import run.halo.app.infra.utils.PathUtils;
 import run.halo.app.theme.DefaultTemplateEnum;
@@ -78,7 +79,7 @@ public class ArchiveRouteFactory implements RouteFactory {
         ArchivePathVariables variables = ArchivePathVariables.from(request);
         int pageNum = pageNumInPathVariable(request);
         String requestPath = request.path();
-        return configuredPageSize(environmentFetcher)
+        return configuredPageSize(environmentFetcher, SystemSetting.Post::getArchivePageSize)
             .flatMap(pageSize -> postFinder.archives(pageNum, pageSize, variables.getYear(),
                 variables.getMonth()))
             .map(list -> new UrlContextListResult.Builder<PostArchiveVo>()

src/main/java/run/halo/app/theme/router/factories/AuthorPostsRouteFactory.java

@@ -17,6 +17,7 @@ import reactor.core.publisher.Mono;
 import run.halo.app.core.extension.User;
 import run.halo.app.extension.ReactiveExtensionClient;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 import run.halo.app.theme.DefaultTemplateEnum;
 import run.halo.app.theme.finders.PostFinder;
 import run.halo.app.theme.finders.vo.ListedPostVo;
@@ -62,7 +63,7 @@ public class AuthorPostsRouteFactory implements RouteFactory {
     private Mono<UrlContextListResult<ListedPostVo>> postList(ServerRequest request, String name) {
         String path = request.path();
         int pageNum = pageNumInPathVariable(request);
-        return configuredPageSize(environmentFetcher)
+        return configuredPageSize(environmentFetcher, SystemSetting.Post::getPostPageSize)
             .flatMap(pageSize -> postFinder.listByOwner(pageNum, pageSize, name))
             .map(list -> new UrlContextListResult.Builder<ListedPostVo>()
                 .listResult(list)

src/main/java/run/halo/app/theme/router/factories/CategoryPostRouteFactory.java

@@ -18,6 +18,7 @@ import reactor.core.publisher.Mono;
 import run.halo.app.core.extension.content.Category;
 import run.halo.app.extension.ReactiveExtensionClient;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 import run.halo.app.infra.exception.NotFoundException;
 import run.halo.app.infra.utils.PathUtils;
 import run.halo.app.theme.DefaultTemplateEnum;
@@ -83,7 +84,7 @@ public class CategoryPostRouteFactory implements RouteFactory {
         ServerRequest request) {
         String path = request.path();
         int pageNum = pageNumInPathVariable(request);
-        return configuredPageSize(environmentFetcher)
+        return configuredPageSize(environmentFetcher, SystemSetting.Post::getCategoryPageSize)
             .flatMap(pageSize -> postFinder.listByCategory(pageNum, pageSize, name))
             .map(list -> new UrlContextListResult.Builder<ListedPostVo>()
                 .listResult(list)

src/main/java/run/halo/app/theme/router/factories/IndexRouteFactory.java

@@ -15,6 +15,7 @@ import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.function.server.ServerResponse;
 import reactor.core.publisher.Mono;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 import run.halo.app.theme.DefaultTemplateEnum;
 import run.halo.app.theme.finders.PostFinder;
 import run.halo.app.theme.finders.vo.ListedPostVo;
@@ -52,7 +53,7 @@ public class IndexRouteFactory implements RouteFactory {
 
     private Mono<UrlContextListResult<ListedPostVo>> postList(ServerRequest request) {
         String path = request.path();
-        return configuredPageSize(environmentFetcher)
+        return configuredPageSize(environmentFetcher, SystemSetting.Post::getPostPageSize)
             .flatMap(pageSize -> postFinder.list(pageNumInPathVariable(request), pageSize))
             .map(list -> new UrlContextListResult.Builder<ListedPostVo>()
                 .listResult(list)

src/main/java/run/halo/app/theme/router/factories/RouteFactory.java

@@ -2,12 +2,14 @@ package run.halo.app.theme.router.factories;
 
 import static org.apache.commons.lang3.ObjectUtils.defaultIfNull;
 
+import java.util.function.Function;
 import org.apache.commons.lang3.math.NumberUtils;
 import org.springframework.web.reactive.function.server.RouterFunction;
 import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.function.server.ServerResponse;
 import reactor.core.publisher.Mono;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 
 /**
  * @author guqing
@@ -17,9 +19,10 @@ public interface RouteFactory {
     RouterFunction<ServerResponse> create(String pattern);
 
     default Mono<Integer> configuredPageSize(
-        SystemConfigurableEnvironmentFetcher environmentFetcher) {
+        SystemConfigurableEnvironmentFetcher environmentFetcher,
+        Function<SystemSetting.Post, Integer> mapper) {
         return environmentFetcher.fetchPost()
-            .map(p -> defaultIfNull(p.getTagPageSize(), ModelConst.DEFAULT_PAGE_SIZE));
+            .map(p -> defaultIfNull(mapper.apply(p), ModelConst.DEFAULT_PAGE_SIZE));
     }
 
     default int pageNumInPathVariable(ServerRequest request) {

src/main/java/run/halo/app/theme/router/factories/TagPostRouteFactory.java

@@ -16,6 +16,7 @@ import reactor.core.publisher.Mono;
 import run.halo.app.core.extension.content.Tag;
 import run.halo.app.extension.ReactiveExtensionClient;
 import run.halo.app.infra.SystemConfigurableEnvironmentFetcher;
+import run.halo.app.infra.SystemSetting;
 import run.halo.app.infra.exception.NotFoundException;
 import run.halo.app.infra.utils.PathUtils;
 import run.halo.app.theme.DefaultTemplateEnum;
@@ -67,7 +68,7 @@ public class TagPostRouteFactory implements RouteFactory {
 
     private Mono<UrlContextListResult<ListedPostVo>> postList(String name, Integer page,
         String requestPath) {
-        return configuredPageSize(environmentFetcher)
+        return configuredPageSize(environmentFetcher, SystemSetting.Post::getTagPageSize)
             .flatMap(pageSize -> postFinder.listByTag(page, pageSize, name))
             .map(list -> new UrlContextListResult.Builder<ListedPostVo>()
                 .listResult(list)

src/test/java/run/halo/app/theme/router/factories/RouteFactoryTest.java

@@ -0,0 +1,59 @@
+package run.halo.app.theme.router.factories;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import reactor.core.publisher.Mono;
+import run.halo.app.infra.SystemSetting;
+
+/**
+ * Tests for {@link RouteFactory}.
+ *
+ * @author guqing
+ * @since 2.3.0
+ */
+@ExtendWith(MockitoExtension.class)
+class RouteFactoryTest extends RouteFactoryTestSuite {
+
+    @Test
+    void configuredPageSize() {
+        SystemSetting.Post post = new SystemSetting.Post();
+        post.setPostPageSize(1);
+        post.setArchivePageSize(2);
+        post.setCategoryPageSize(3);
+        post.setTagPageSize(null);
+        when(environmentFetcher.fetchPost()).thenReturn(Mono.just(post));
+
+        TestRouteFactory routeFactory = new TestRouteFactory();
+        assertThat(
+            routeFactory.configuredPageSize(environmentFetcher, SystemSetting.Post::getTagPageSize)
+                .block()).isEqualTo(ModelConst.DEFAULT_PAGE_SIZE);
+
+        assertThat(
+            routeFactory.configuredPageSize(environmentFetcher, SystemSetting.Post::getPostPageSize)
+                .block()).isEqualTo(post.getPostPageSize());
+
+        assertThat(
+            routeFactory.configuredPageSize(environmentFetcher,
+                SystemSetting.Post::getCategoryPageSize).block())
+            .isEqualTo(post.getCategoryPageSize());
+
+        assertThat(
+            routeFactory.configuredPageSize(environmentFetcher,
+                SystemSetting.Post::getArchivePageSize).block())
+            .isEqualTo(post.getArchivePageSize());
+    }
+
+    static class TestRouteFactory implements RouteFactory {
+
+        @Override
+        public RouterFunction<ServerResponse> create(String pattern) {
+            return null;
+        }
+    }
+}