feat: 增加友链申请、独立页面、投票/悬赏/抽奖帖与侧栏签到，并统一开发数据目录

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-27 06:23:54 +08:00
parent df19752a1e
commit 2208af7070
80 changed files with 9620 additions and 641 deletions
--- a/service/lottery_post.go
+++ b/service/lottery_post.go
@@ -0,0 +1,150 @@
+package service
+
+import (
+	"crypto/rand"
+	"errors"
+	"math/big"
+
+	"git.iioio.com/freefire/jiang13-forum/model"
+	"gorm.io/gorm"
+)
+
+var (
+	ErrLotteryAlreadyDrawn = errors.New("已开奖")
+	ErrLotteryNotEnough    = errors.New("参与人数不足")
+)
+
+// PostLotteryView 帖内抽奖视图
+type PostLotteryView struct {
+	WinnerCount   int                    `json:"winner_count"`
+	Status        string                 `json:"status"`
+	ParticipantCount int                 `json:"participant_count"`
+	Winners       []PostLotteryWinnerView `json:"winners,omitempty"`
+}
+
+type PostLotteryWinnerView struct {
+	UserID    uint   `json:"user_id"`
+	Username  string `json:"username"`
+	Nickname  string `json:"nickname"`
+	CommentID uint   `json:"comment_id"`
+}
+
+// InitPostLottery 初始化抽奖帖
+func InitPostLottery(postID uint, winnerCount int) error {
+	if winnerCount < 1 || winnerCount > 20 {
+		return errors.New("开奖人数需 1-20")
+	}
+	return model.DB.Model(&model.Post{}).Where("id = ?", postID).Updates(map[string]interface{}{
+		"lottery_winner_count": winnerCount,
+		"lottery_status":       model.PostLotteryStatusOpen,
+	}).Error
+}
+
+// GetPostLotteryView 获取抽奖视图
+func GetPostLotteryView(post *model.Post) (*PostLotteryView, error) {
+	if post == nil || post.PostType != model.PostTypeLottery {
+		return nil, nil
+	}
+	participants, err := lotteryParticipants(post.ID, post.UserID)
+	if err != nil {
+		return nil, err
+	}
+	view := &PostLotteryView{
+		WinnerCount:      post.LotteryWinnerCount,
+		Status:           post.LotteryStatus,
+		ParticipantCount: len(participants),
+	}
+	if post.LotteryStatus == model.PostLotteryStatusDrawn {
+		var winners []model.PostLotteryWinner
+		model.DB.Preload("User").Where("post_id = ?", post.ID).Find(&winners)
+		for _, w := range winners {
+			view.Winners = append(view.Winners, PostLotteryWinnerView{
+				UserID: w.UserID, Username: w.User.Username, Nickname: w.User.Nickname,
+				CommentID: w.CommentID,
+			})
+		}
+	}
+	return view, nil
+}
+
+func lotteryParticipants(postID, authorID uint) ([]model.Comment, error) {
+	var comments []model.Comment
+	err := model.DB.Where("post_id = ? AND status = ? AND user_id <> ?", postID, model.ContentStatusPublished, authorID).
+		Order("id ASC").Find(&comments).Error
+	if err != nil {
+		return nil, err
+	}
+	seen := map[uint]bool{}
+	var unique []model.Comment
+	for _, c := range comments {
+		if seen[c.UserID] {
+			continue
+		}
+		seen[c.UserID] = true
+		unique = append(unique, c)
+	}
+	return unique, nil
+}
+
+// DrawPostLottery 开奖
+func DrawPostLottery(postID, operatorID uint, isAdmin bool) (*PostLotteryView, error) {
+	var post model.Post
+	if err := model.DB.First(&post, postID).Error; err != nil {
+		return nil, ErrPostNotFound
+	}
+	if post.PostType != model.PostTypeLottery {
+		return nil, errors.New("非抽奖帖")
+	}
+	if !isAdmin && post.UserID != operatorID {
+		return nil, ErrPermissionDenied
+	}
+	if post.LotteryStatus == model.PostLotteryStatusDrawn {
+		return nil, ErrLotteryAlreadyDrawn
+	}
+	participants, err := lotteryParticipants(postID, post.UserID)
+	if err != nil {
+		return nil, err
+	}
+	need := post.LotteryWinnerCount
+	if need < 1 {
+		need = 1
+	}
+	if len(participants) < need {
+		return nil, ErrLotteryNotEnough
+	}
+	picked := randomPickComments(participants, need)
+	err = model.DB.Transaction(func(tx *gorm.DB) error {
+		for _, c := range picked {
+			w := model.PostLotteryWinner{PostID: postID, UserID: c.UserID, CommentID: c.ID}
+			if err := tx.Create(&w).Error; err != nil {
+				return err
+			}
+		}
+		return tx.Model(&post).Update("lottery_status", model.PostLotteryStatusDrawn).Error
+	})
+	if err != nil {
+		return nil, err
+	}
+	post.LotteryStatus = model.PostLotteryStatusDrawn
+	return GetPostLotteryView(&post)
+}
+
+func randomPickComments(comments []model.Comment, n int) []model.Comment {
+	pool := append([]model.Comment{}, comments...)
+	out := make([]model.Comment, 0, n)
+	for i := 0; i < n && len(pool) > 0; i++ {
+		idx, err := rand.Int(rand.Reader, big.NewInt(int64(len(pool))))
+		if err != nil {
+			idx = big.NewInt(0)
+		}
+		j := int(idx.Int64())
+		out = append(out, pool[j])
+		pool = append(pool[:j], pool[j+1:]...)
+	}
+	return out
+}
+
+// DeleteLotteryData 删帖清理
+func DeleteLotteryData(tx *gorm.DB, postID uint) {
+	tx.Where("post_id = ?", postID).Delete(&model.PostLotteryWinner{})
+}