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后端 Go+Gin：认证/CSRF/限流、板块、帖子、评论、点赞、通知、用户资料、置顶推荐；前端 Next.js 16：发帖/编辑/删除、搜索、分页、点赞、通知中心、设置；基础设施 docker-compose 与配置模板；添加 .gitignore 与专有许可证（保留所有权利）
This commit is contained in:
287
backend/service/post.go
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287
backend/service/post.go
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package service
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import (
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"errors"
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"strings"
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"time"
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"github.com/freefire/jiang13-bbs/model"
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"gorm.io/gorm"
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)
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// PostService 帖子服务
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type PostService struct {
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db *gorm.DB
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}
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func NewPostService(db *gorm.DB) *PostService {
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return &PostService{db: db}
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}
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// PostListQuery 帖子列表查询参数
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type PostListQuery struct {
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BoardID uint
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Page int
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Size int
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Sort string // latest | hot
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Keyword string // 搜索关键词
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}
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// PostListItem 帖子列表项（不含正文）
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type PostListItem struct {
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ID uint `json:"id"`
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BoardID uint `json:"board_id"`
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UserID uint `json:"user_id"`
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Title string `json:"title"`
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Tags string `json:"tags"`
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PostType string `json:"post_type"`
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Pinned int `json:"pinned"`
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Recommended bool `json:"recommended"`
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LikeCount int `json:"like_count"`
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ViewCount int `json:"view_count"`
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CommentCount int `json:"comment_count"`
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Liked bool `json:"liked"`
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CreatedAt time.Time `json:"created_at"`
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Board model.Board `json:"board"`
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User model.User `json:"user"`
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}
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// List 获取帖子列表
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func (s *PostService) List(q PostListQuery) ([]PostListItem, int64, error) {
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if q.Page < 1 {
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q.Page = 1
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}
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if q.Size < 1 || q.Size > 50 {
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q.Size = 20
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}
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query := s.db.Model(&model.Post{}).Where("status = ?", model.ContentStatusPublished)
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if q.BoardID > 0 {
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query = query.Where("board_id = ?", q.BoardID)
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}
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if q.Keyword != "" {
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kw := "%" + q.Keyword + "%"
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query = query.Where("title ILIKE ? OR content ILIKE ? OR tags ILIKE ?", kw, kw, kw)
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}
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var total int64
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if err := query.Count(&total).Error; err != nil {
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return nil, 0, err
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}
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var posts []model.Post
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offset := (q.Page - 1) * q.Size
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order := "pinned DESC, created_at DESC"
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if q.Sort == "hot" {
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order = "pinned DESC, (like_count + comment_count * 2) DESC, created_at DESC"
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}
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if err := query.Order(order).Offset(offset).Limit(q.Size).
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Preload("Board").Preload("User").Find(&posts).Error; err != nil {
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return nil, 0, err
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}
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items := make([]PostListItem, 0, len(posts))
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for _, p := range posts {
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items = append(items, PostListItem{
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ID: p.ID, BoardID: p.BoardID, UserID: p.UserID,
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Title: p.Title, Tags: p.Tags, PostType: p.PostType,
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Pinned: p.Pinned, Recommended: p.Recommended, LikeCount: p.LikeCount, ViewCount: p.ViewCount,
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CommentCount: p.CommentCount, CreatedAt: p.CreatedAt,
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Board: p.Board, User: p.User,
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})
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}
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return items, total, nil
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}
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// ListByUser 获取指定用户发布的帖子（公开已发布）
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func (s *PostService) ListByUser(userID uint, page, size int) ([]PostListItem, int64, error) {
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if page < 1 {
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page = 1
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}
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if size < 1 || size > 50 {
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size = 20
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}
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query := s.db.Model(&model.Post{}).Where("user_id = ? AND status = ?", userID, model.ContentStatusPublished)
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var total int64
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if err := query.Count(&total).Error; err != nil {
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return nil, 0, err
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}
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var posts []model.Post
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offset := (page - 1) * size
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if err := query.Order("pinned DESC, created_at DESC").Offset(offset).Limit(size).
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Preload("Board").Preload("User").Find(&posts).Error; err != nil {
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return nil, 0, err
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}
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items := make([]PostListItem, 0, len(posts))
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for _, p := range posts {
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items = append(items, PostListItem{
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ID: p.ID, BoardID: p.BoardID, UserID: p.UserID,
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Title: p.Title, Tags: p.Tags, PostType: p.PostType,
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Pinned: p.Pinned, Recommended: p.Recommended, LikeCount: p.LikeCount, ViewCount: p.ViewCount,
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CommentCount: p.CommentCount, CreatedAt: p.CreatedAt,
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Board: p.Board, User: p.User,
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})
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}
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return items, total, nil
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}
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// GetAuthorID 获取帖子作者 ID（不增加浏览量）
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func (s *PostService) GetAuthorID(postID uint) (uint, error) {
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var post model.Post
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if err := s.db.Select("user_id").First(&post, postID).Error; err != nil {
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return 0, err
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}
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return post.UserID, nil
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}
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// CountByUser 统计用户发帖数
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func (s *PostService) CountByUser(userID uint) (int64, error) {
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var total int64
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err := s.db.Model(&model.Post{}).Where("user_id = ? AND status = ?", userID, model.ContentStatusPublished).Count(&total).Error
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return total, err
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}
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// TogglePin 切换置顶状态（仅管理员可操作，由 handler 校验权限）
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func (s *PostService) TogglePin(id uint) (int, error) {
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var post model.Post
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if err := s.db.First(&post, id).Error; err != nil {
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return 0, err
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}
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var newPinned int
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if post.Pinned > 0 {
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newPinned = 0
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} else {
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newPinned = 1
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}
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result := s.db.Model(&post).Update("pinned", newPinned)
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if result.Error != nil {
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return 0, result.Error
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}
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return newPinned, nil
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}
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// ToggleRecommend 切换推荐状态（仅管理员可操作，由 handler 校验权限）
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func (s *PostService) ToggleRecommend(id uint) (bool, error) {
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var post model.Post
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if err := s.db.First(&post, id).Error; err != nil {
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return false, err
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}
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newVal := !post.Recommended
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result := s.db.Model(&post).Update("recommended", newVal)
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if result.Error != nil {
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return false, result.Error
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}
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return newVal, nil
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}
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// GetByID 获取帖子详情
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func (s *PostService) GetByID(id uint) (*model.Post, error) {
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var post model.Post
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if err := s.db.Preload("Board").Preload("User").First(&post, id).Error; err != nil {
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return nil, err
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}
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// 增加浏览量
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s.db.Model(&post).UpdateColumn("view_count", gorm.Expr("view_count + 1"))
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return &post, nil
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}
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// Create 创建帖子
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func (s *PostService) Create(userID uint, boardID uint, title, content, tags, postType string) (*model.Post, error) {
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title = strings.TrimSpace(title)
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content = strings.TrimSpace(content)
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if title == "" {
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return nil, errors.New("标题不能为空")
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}
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if content == "" {
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return nil, errors.New("内容不能为空")
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}
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if boardID == 0 {
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return nil, errors.New("请选择板块")
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}
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// 新用户 24h 冷静期校验
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if err := s.checkNewUserCooldown(userID); err != nil {
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return nil, err
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}
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post := &model.Post{
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BoardID: boardID,
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UserID: userID,
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Title: title,
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Content: content,
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Tags: tags,
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PostType: postType,
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Status: model.ContentStatusPublished,
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}
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if err := s.db.Create(post).Error; err != nil {
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return nil, err
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}
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// 预加载关联
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s.db.Preload("Board").Preload("User").First(post, post.ID)
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return post, nil
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}
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// checkNewUserCooldown 新用户发帖 24h 冷静期
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func (s *PostService) checkNewUserCooldown(userID uint) error {
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var user model.User
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if err := s.db.First(&user, userID).Error; err != nil {
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return err
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}
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// 注册不足 24 小时的新用户不能发帖
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if time.Since(user.CreatedAt) < 24*time.Hour {
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return errors.New("新用户注册 24 小时后才能发帖")
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}
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return nil
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}
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// Update 更新帖子（仅作者或管理员可操作）
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func (s *PostService) Update(postID, userID uint, role string, title, content, tags string) (*model.Post, error) {
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var post model.Post
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if err := s.db.First(&post, postID).Error; err != nil {
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return nil, errors.New("帖子不存在")
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}
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// 权限校验：作者本人或管理员
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if post.UserID != userID && role != RoleAdmin {
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return nil, errors.New("无权限编辑此帖子")
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}
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updates := map[string]interface{}{}
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if title != "" {
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t := strings.TrimSpace(title)
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if t == "" {
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return nil, errors.New("标题不能为空")
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}
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updates["title"] = t
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}
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if content != "" {
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c := strings.TrimSpace(content)
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if c == "" {
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return nil, errors.New("内容不能为空")
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}
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updates["content"] = c
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}
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updates["tags"] = tags
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if err := s.db.Model(&post).Updates(updates).Error; err != nil {
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return nil, err
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}
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s.db.Preload("Board").Preload("User").First(&post, post.ID)
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return &post, nil
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}
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// Delete 删除帖子（仅作者或管理员可操作）
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func (s *PostService) Delete(postID, userID uint, role string) error {
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var post model.Post
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if err := s.db.First(&post, postID).Error; err != nil {
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return errors.New("帖子不存在")
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}
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// 权限校验：作者本人或管理员
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if post.UserID != userID && role != RoleAdmin {
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return errors.New("无权限删除此帖子")
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}
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// 软删除（gorm DeletedAt）
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if err := s.db.Delete(&post).Error; err != nil {
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return err
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}
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return nil
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}
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