Support querying multi post statuses (#1527)

* feat: post page list supports multiple status queries

src/main/java/run/halo/app/controller/content/api/PostController.java

@@ -5,6 +5,7 @@ import static org.springframework.data.domain.Sort.Direction.DESC;
 import io.swagger.annotations.ApiOperation;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
+import java.util.Set;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
@@ -44,6 +45,7 @@ import run.halo.app.service.PostService;
  *
  * @author johnniang
  * @author ryanwang
+ * @author guqing
  * @date 2019-04-02
  */
 @RestController("ApiContentPostController")
@@ -83,7 +85,7 @@ public class PostController {
         PostQuery postQuery = new PostQuery();
         postQuery.setKeyword(keyword);
         postQuery.setCategoryId(categoryId);
-        postQuery.setStatus(PostStatus.PUBLISHED);
+        postQuery.setStatuses(Set.of(PostStatus.PUBLISHED));
         Page<Post> postPage = postService.pageBy(postQuery, pageable);
         return postService.convertToListVo(postPage, true);
     }

src/main/java/run/halo/app/model/params/PostQuery.java

@@ -1,12 +1,16 @@
 package run.halo.app.model.params;
 
+import java.util.HashSet;
+import java.util.Set;
 import lombok.Data;
+import org.springframework.util.CollectionUtils;
 import run.halo.app.model.enums.PostStatus;
 
 /**
  * Post query.
  *
  * @author johnniang
+ * @author guqing
  * @date 4/10/19
  */
 @Data
@@ -20,11 +24,46 @@ public class PostQuery {
     /**
      * Post status.
      */
+    @Deprecated(forRemoval = true, since = "1.5.0")
     private PostStatus status;
 
+    /**
+     * Post statuses.
+     */
+    private Set<PostStatus> statuses;
+
     /**
      * Category id.
      */
     private Integer categoryId;
 
+    /**
+     * This method is deprecated in version 1.5.0, and it is recommended to use
+     * <code>getStatuses()</code> method.
+     *
+     * @see #getStatuses()
+     * @return post status.
+     */
+    @Deprecated
+    public PostStatus getStatus() {
+        return status;
+    }
+
+    /**
+     * In order to be compatible with status, this method will return the combined results
+     * of status and statuses before status is removed.
+     *
+     * @return a combined status set of status and statues
+     */
+    public Set<PostStatus> getStatuses() {
+        Set<PostStatus> statuses = new HashSet<>();
+        // Need to be compatible with status parameter values due to historical reasons.
+        if (this.status != null) {
+            statuses.add(this.status);
+        }
+        if (!CollectionUtils.isEmpty(this.statuses)) {
+            statuses.addAll(this.statuses);
+        }
+        return statuses;
+    }
 }

src/main/java/run/halo/app/service/impl/PostServiceImpl.java

@@ -16,11 +16,13 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
+import javax.persistence.criteria.CriteriaBuilder.In;
 import javax.persistence.criteria.Predicate;
 import javax.persistence.criteria.Root;
 import javax.persistence.criteria.Subquery;
 import javax.validation.constraints.NotNull;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.ArrayUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.data.domain.Page;
@@ -149,7 +151,7 @@ public class PostServiceImpl extends BasePostServiceImpl<Post> implements PostSe
 
         PostQuery postQuery = new PostQuery();
         postQuery.setKeyword(keyword);
-        postQuery.setStatus(PostStatus.PUBLISHED);
+        postQuery.setStatuses(Set.of(PostStatus.PUBLISHED));
 
         // Build specification and find all
         return postRepository.findAll(buildSpecByQuery(postQuery), pageable);
@@ -808,8 +810,9 @@ public class PostServiceImpl extends BasePostServiceImpl<Post> implements PostSe
         return (root, query, criteriaBuilder) -> {
             List<Predicate> predicates = new LinkedList<>();
 
-            if (postQuery.getStatus() != null) {
-                predicates.add(criteriaBuilder.equal(root.get("status"), postQuery.getStatus()));
+            Set<PostStatus> statuses = postQuery.getStatuses();
+            if (!CollectionUtils.isEmpty(statuses)) {
+                predicates.add(root.get("status").in(statuses));
             }
 
             if (postQuery.getCategoryId() != null) {