feat(P3): 私信 + #话题标签 + @提及 完成

backend/internal/message/entity.go

@@ -0,0 +1,25 @@
+package message
+
+import "time"
+
+type Message struct {
+	ID        uint      `gorm:"primaryKey" json:"id"`
+	FromID    uint      `gorm:"index:idx_message_from;not null" json:"from_id"`
+	ToID      uint      `gorm:"index:idx_message_to;not null" json:"to_id"`
+	Content   string    `gorm:"type:text;not null" json:"content"`
+	IsRead    bool      `gorm:"default:false" json:"is_read"`
+	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
+}
+
+type SendRequest struct {
+	ToID    uint   `json:"to_id"`
+	Content string `json:"content"`
+}
+
+type ListRequest struct {
+	PeerID uint `json:"peer_id"`
+}
+
+type ListResponse struct {
+	Messages []Message `json:"messages"`
+}

backend/internal/message/handler.go

@@ -0,0 +1,95 @@
+package message
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"time"
+
+	"feedsystem_video_go/internal/apierror"
+	"feedsystem_video_go/internal/middleware/jwt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+type Repository struct{ db *gorm.DB }
+type Service struct{ repo *Repository }
+type Handler struct{ service *Service }
+
+func NewRepository(db *gorm.DB) *Repository { return &Repository{db: db} }
+func NewService(repo *Repository) *Service   { return &Service{repo: repo} }
+func NewHandler(service *Service) *Handler   { return &Handler{service: service} }
+
+func (r *Repository) AutoMigrate(ctx context.Context) error {
+	return r.db.WithContext(ctx).AutoMigrate(&Message{})
+}
+
+func (r *Repository) Send(ctx context.Context, m *Message) error {
+	m.Content = strings.TrimSpace(m.Content)
+	if m.Content == "" {
+		return errors.New("content is required")
+	}
+	m.CreatedAt = time.Now()
+	return r.db.WithContext(ctx).Create(m).Error
+}
+
+func (r *Repository) List(ctx context.Context, userID, peerID uint, limit int) ([]Message, error) {
+	var msgs []Message
+	err := r.db.WithContext(ctx).
+		Where("(from_id = ? AND to_id = ?) OR (from_id = ? AND to_id = ?)", userID, peerID, peerID, userID).
+		Order("created_at desc").
+		Limit(limit).
+		Find(&msgs).Error
+	return msgs, err
+}
+
+func (h *Handler) Send(c *gin.Context) {
+	fromID, err := jwt.GetAccountID(c)
+	if err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": err.Error()})
+		return
+	}
+	var req SendRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	if req.ToID == 0 || strings.TrimSpace(req.Content) == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "to_id and content are required"})
+		return
+	}
+	m := &Message{FromID: fromID, ToID: req.ToID, Content: req.Content}
+	if err := h.service.repo.Send(c.Request.Context(), m); err != nil {
+		c.JSON(apierror.ClassifyHTTPStatus(err), gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, m)
+}
+
+func (h *Handler) List(c *gin.Context) {
+	userID, err := jwt.GetAccountID(c)
+	if err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": err.Error()})
+		return
+	}
+	var req ListRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	if req.PeerID == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "peer_id is required"})
+		return
+	}
+	msgs, err := h.service.repo.List(c.Request.Context(), userID, req.PeerID, 50)
+	if err != nil {
+		c.JSON(apierror.ClassifyHTTPStatus(err), gin.H{"error": err.Error()})
+		return
+	}
+	if msgs == nil {
+		msgs = []Message{}
+	}
+	c.JSON(http.StatusOK, ListResponse{Messages: msgs})
+}