feat(posts): filter posts by blocked users

Add functionality to filter out posts from blocked users in post listing endpoints. Includes a new `IsBlockedBatch` method for efficient batch checking of blocked relationships and `is_blocked` field in API responses when viewing a blocked user's posts.

internal/handler/post_handler.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"strconv"
@@ -31,6 +32,41 @@ func NewPostHandler(postService service.PostService, userService service.UserSer
 	}
 }
 
+// collectAuthorIDs 从帖子列表中收集去重的作者ID
+func collectAuthorIDs(posts []*model.Post) []string {
+	seen := make(map[string]struct{})
+	ids := make([]string, 0, len(posts))
+	for _, p := range posts {
+		if _, ok := seen[p.UserID]; !ok {
+			seen[p.UserID] = struct{}{}
+			ids = append(ids, p.UserID)
+		}
+	}
+	return ids
+}
+
+// filterBlockedPosts 过滤掉被当前用户拉黑的作者发布的帖子
+func (h *PostHandler) filterBlockedPosts(ctx context.Context, posts []*model.Post, currentUserID string) []*model.Post {
+	if currentUserID == "" || len(posts) == 0 {
+		return posts
+	}
+
+	authorIDs := collectAuthorIDs(posts)
+	blockedMap, err := h.userService.IsBlockedBatch(ctx, currentUserID, authorIDs)
+	if err != nil {
+		return posts
+	}
+
+	filtered := make([]*model.Post, 0, len(posts))
+	for _, p := range posts {
+		if blockedMap[p.UserID] {
+			continue
+		}
+		filtered = append(filtered, p)
+	}
+	return filtered
+}
+
 // channelMapForPosts 批量解析帖子中的频道 ID，用于填充响应里的 channel 名称
 func (h *PostHandler) channelMapForPosts(posts []*model.Post) map[string]*model.Channel {
 	ids := dto.CollectPostChannelIDs(posts)
@@ -267,6 +303,8 @@ func (h *PostHandler) List(c *gin.Context) {
 		return
 	}
 
+	posts = h.filterBlockedPosts(c.Request.Context(), posts, currentUserID)
+
 	// 批量获取交互状态
 	postIDs := make([]string, len(posts))
 	for i, post := range posts {
@@ -324,6 +362,8 @@ func (h *PostHandler) ListByCursor(c *gin.Context) {
 		return
 	}
 
+	result.Items = h.filterBlockedPosts(c.Request.Context(), result.Items, currentUserID)
+
 	// 批量获取交互状态
 	postIDs := make([]string, len(result.Items))
 	for i, post := range result.Items {
@@ -577,6 +617,32 @@ func (h *PostHandler) GetUserPosts(c *gin.Context) {
 		return
 	}
 
+	// 检查是否拉黑了对方
+	if currentUserID != "" && currentUserID != userID {
+		isBlocked, _ := h.userService.IsBlocked(c.Request.Context(), currentUserID, userID)
+		if isBlocked {
+			// 检查是否使用游标分页
+			cursorStr := c.Query("cursor")
+			if cursorStr != "" {
+				response.Success(c, &dto.PostCursorPageResponse{
+					Items:     []*dto.PostResponse{},
+					HasMore:   false,
+					IsBlocked: true,
+				})
+			} else {
+				response.Success(c, gin.H{
+					"list":        []*dto.PostResponse{},
+					"total":       0,
+					"page":        1,
+					"page_size":   20,
+					"total_pages": 0,
+					"is_blocked":  true,
+				})
+			}
+			return
+		}
+	}
+
 	// 检查是否使用游标分页
 	cursorStr := c.Query("cursor")
 	if cursorStr != "" {
@@ -709,6 +775,9 @@ func (h *PostHandler) Search(c *gin.Context) {
 
 	// 批量获取交互状态
 	currentUserID := c.GetString("user_id")
+
+	posts = h.filterBlockedPosts(c.Request.Context(), posts, currentUserID)
+
 	postIDs := make([]string, len(posts))
 	for i, post := range posts {
 		postIDs[i] = post.ID
@@ -736,6 +805,8 @@ func (h *PostHandler) SearchByCursor(c *gin.Context) {
 		return
 	}
 
+	result.Items = h.filterBlockedPosts(c.Request.Context(), result.Items, currentUserID)
+
 	// 批量获取交互状态
 	postIDs := make([]string, len(result.Items))
 	for i, post := range result.Items {