582 lines
16 KiB
Go
582 lines
16 KiB
Go
package chat
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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"time"
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"hfb_sys/backend/internal/model"
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"golang.org/x/crypto/bcrypt"
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"gorm.io/datatypes"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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type Repository struct {
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db *gorm.DB
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}
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const (
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defaultSupportUsername = "admin"
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defaultSupportPassword = "admin123456"
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defaultSupportNickname = "超级管理员"
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)
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func NewRepository(db *gorm.DB) *Repository {
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return &Repository{db: db}
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}
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func EnsureOrderConversation(tx *gorm.DB, order model.RentalOrder) (*model.ChatConversation, error) {
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var existing model.ChatConversation
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err := tx.Where("order_id = ?", order.ID).First(&existing).Error
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if err == nil {
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return &existing, nil
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}
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if !errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, err
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}
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now := time.Now()
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conversation := model.ChatConversation{
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OrderID: order.ID,
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Type: "order_group",
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Title: orderConversationTitle(order),
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Status: "active",
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}
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if err := tx.Create(&conversation).Error; err != nil {
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return nil, err
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}
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participants := []model.ChatParticipant{
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{
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ConversationID: conversation.ID,
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ParticipantType: "user",
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ParticipantID: order.RenterID,
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Role: "renter",
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JoinedAt: now,
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},
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{
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ConversationID: conversation.ID,
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ParticipantType: "user",
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ParticipantID: order.OwnerID,
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Role: "owner",
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JoinedAt: now,
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},
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}
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if supportID := defaultSupportAdminID(tx); supportID > 0 {
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participants = append(participants, model.ChatParticipant{
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ConversationID: conversation.ID,
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ParticipantType: "admin",
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ParticipantID: supportID,
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Role: "support",
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JoinedAt: now,
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})
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}
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for _, participant := range participants {
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if err := tx.Clauses(clause.OnConflict{DoNothing: true}).Create(&participant).Error; err != nil {
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return nil, err
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}
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}
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message := model.ChatMessage{
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ConversationID: conversation.ID,
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SenderType: "system",
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SenderRole: "system",
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ContentType: "system",
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Content: "订单已支付，群聊已创建。租客、号主和客服可在这里沟通交接与结账问题。",
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AttachmentURLS: emptyJSONList(),
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}
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if err := tx.Create(&message).Error; err != nil {
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return nil, err
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}
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conversation.LastMessageID = &message.ID
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conversation.LastMessagePreview = truncatePreview(message.Content)
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conversation.LastMessageAt = &message.CreatedAt
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if err := tx.Save(&conversation).Error; err != nil {
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return nil, err
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}
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return &conversation, nil
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}
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func (r *Repository) ListConversations(principal Principal, page, pageSize int) (*PaginatedResult, error) {
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page, pageSize = normalizePagination(page, pageSize)
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var total int64
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countDB := r.db.Table("chat_conversations AS c").
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Joins("JOIN chat_participants AS cp ON cp.conversation_id = c.id").
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Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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if err := countDB.Count(&total).Error; err != nil {
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return nil, err
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}
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var rows []conversationRow
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offset := (page - 1) * pageSize
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err := r.conversationQuery(principal).
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Order("COALESCE(c.last_message_at, c.created_at) DESC, c.id DESC").
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Offset(offset).
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Limit(pageSize).
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Scan(&rows).Error
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if err != nil {
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return nil, err
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}
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items := make([]ConversationDTO, 0, len(rows))
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for _, row := range rows {
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items = append(items, row.toDTO(nil))
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}
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return &PaginatedResult{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
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}
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func (r *Repository) FindConversation(principal Principal, id uint64) (*ConversationDTO, error) {
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var row conversationRow
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err := r.conversationQuery(principal).Where("c.id = ?", id).First(&row).Error
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrConversationNotFound
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}
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return nil, err
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}
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participants, err := r.participants(row.ID)
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if err != nil {
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return nil, err
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}
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dto := row.toDTO(participants)
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return &dto, nil
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}
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func (r *Repository) FindOrderConversation(userID uint64, orderID uint64) (*ConversationDTO, error) {
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var row conversationRow
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principal := Principal{Type: "user", ID: userID}
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err := r.conversationQuery(principal).Where("c.order_id = ?", orderID).First(&row).Error
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrConversationNotFound
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}
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return nil, err
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}
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participants, err := r.participants(row.ID)
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if err != nil {
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return nil, err
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}
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dto := row.toDTO(participants)
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return &dto, nil
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}
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func (r *Repository) Messages(principal Principal, conversationID uint64, page, pageSize int) (*PaginatedResult, error) {
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page, pageSize = normalizePagination(page, pageSize)
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if _, err := r.findParticipant(r.db, principal, conversationID, false); err != nil {
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return nil, err
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}
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var total int64
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if err := r.db.Model(&model.ChatMessage{}).Where("conversation_id = ?", conversationID).Count(&total).Error; err != nil {
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return nil, err
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}
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offset := (page - 1) * pageSize
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var rows []model.ChatMessage
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if err := r.db.Where("conversation_id = ?", conversationID).
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Order("id ASC").
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Offset(offset).
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Limit(pageSize).
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Find(&rows).Error; err != nil {
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return nil, err
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}
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items, err := r.toMessageDTOs(principal, rows)
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if err != nil {
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return nil, err
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}
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return &PaginatedResult{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
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}
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func (r *Repository) SendMessage(principal Principal, conversationID uint64, req SendMessageRequest) (*MessageDTO, error) {
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var messageID uint64
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err := r.db.Transaction(func(tx *gorm.DB) error {
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participant, err := r.findParticipant(tx, principal, conversationID, true)
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if err != nil {
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return err
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}
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var conversation model.ChatConversation
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if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&conversation, conversationID).Error; err != nil {
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return err
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}
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if conversation.Status != "active" {
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return ErrPermissionDenied
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}
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message := model.ChatMessage{
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ConversationID: conversation.ID,
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SenderType: principal.Type,
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SenderID: principal.ID,
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SenderRole: participant.Role,
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ContentType: "text",
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Content: req.Content,
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AttachmentURLS: emptyJSONList(),
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}
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if err := tx.Create(&message).Error; err != nil {
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return err
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}
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conversation.LastMessageID = &message.ID
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conversation.LastMessagePreview = truncatePreview(message.Content)
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conversation.LastMessageAt = &message.CreatedAt
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if err := tx.Save(&conversation).Error; err != nil {
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return err
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}
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now := time.Now()
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if err := tx.Model(participant).Update("last_read_at", now).Error; err != nil {
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return err
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}
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messageID = message.ID
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return nil
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})
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if err != nil {
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return nil, err
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}
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var message model.ChatMessage
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if err := r.db.First(&message, messageID).Error; err != nil {
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return nil, err
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}
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items, err := r.toMessageDTOs(principal, []model.ChatMessage{message})
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if err != nil {
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return nil, err
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}
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if len(items) == 0 {
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return nil, ErrConversationNotFound
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}
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return &items[0], nil
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}
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func (r *Repository) MarkRead(principal Principal, conversationID uint64) error {
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return r.db.Transaction(func(tx *gorm.DB) error {
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participant, err := r.findParticipant(tx, principal, conversationID, true)
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if err != nil {
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return err
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}
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now := time.Now()
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return tx.Model(participant).Update("last_read_at", now).Error
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})
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}
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func (r *Repository) conversationQuery(principal Principal) *gorm.DB {
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return r.db.Table("chat_conversations AS c").
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Select(`c.id, c.order_id, c.type, c.title, c.status, c.last_message_id,
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c.last_message_preview, c.last_message_at, c.created_at, c.updated_at, cp.role,
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(
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SELECT COUNT(1)
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FROM chat_messages AS cm
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WHERE cm.conversation_id = c.id
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AND NOT (cm.sender_type = ? AND cm.sender_id = ?)
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AND (cp.last_read_at IS NULL OR cm.created_at > cp.last_read_at)
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) AS unread_count`, principal.Type, principal.ID).
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Joins("JOIN chat_participants AS cp ON cp.conversation_id = c.id").
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Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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}
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func (r *Repository) findParticipant(tx *gorm.DB, principal Principal, conversationID uint64, lock bool) (*model.ChatParticipant, error) {
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var participant model.ChatParticipant
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db := tx
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if lock {
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db = db.Clauses(clause.Locking{Strength: "UPDATE"})
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}
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err := db.Where("conversation_id = ? AND participant_type = ? AND participant_id = ?", conversationID, principal.Type, principal.ID).
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First(&participant).Error
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrPermissionDenied
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}
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return nil, err
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}
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return &participant, nil
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}
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func (r *Repository) participants(conversationID uint64) ([]ParticipantDTO, error) {
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var rows []model.ChatParticipant
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if err := r.db.Where("conversation_id = ?", conversationID).Order("id ASC").Find(&rows).Error; err != nil {
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return nil, err
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}
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userNames, userAvatars, adminNames, err := r.participantNames(rows)
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if err != nil {
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return nil, err
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}
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items := make([]ParticipantDTO, 0, len(rows))
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for _, row := range rows {
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name := "系统"
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avatar := ""
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if row.ParticipantType == "user" {
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name = userNames[row.ParticipantID]
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avatar = userAvatars[row.ParticipantID]
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}
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if row.ParticipantType == "admin" {
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name = adminNames[row.ParticipantID]
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}
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items = append(items, ParticipantDTO{
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ID: row.ID,
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ConversationID: row.ConversationID,
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ParticipantType: row.ParticipantType,
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ParticipantID: row.ParticipantID,
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Role: row.Role,
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DisplayName: fallbackName(row.ParticipantType, row.ParticipantID, name),
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AvatarURL: avatar,
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LastReadAt: row.LastReadAt,
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JoinedAt: row.JoinedAt,
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})
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}
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return items, nil
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}
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func (r *Repository) toMessageDTOs(principal Principal, rows []model.ChatMessage) ([]MessageDTO, error) {
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userIDs := make([]uint64, 0)
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adminIDs := make([]uint64, 0)
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for _, row := range rows {
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if row.SenderType == "user" && row.SenderID > 0 {
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userIDs = append(userIDs, row.SenderID)
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}
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if row.SenderType == "admin" && row.SenderID > 0 {
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adminIDs = append(adminIDs, row.SenderID)
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}
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}
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userNames, userAvatars, err := r.userNames(userIDs)
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if err != nil {
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return nil, err
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}
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adminNames, err := r.adminNames(adminIDs)
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if err != nil {
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return nil, err
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}
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items := make([]MessageDTO, 0, len(rows))
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for _, row := range rows {
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name := "系统"
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avatar := ""
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if row.SenderType == "user" {
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name = userNames[row.SenderID]
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avatar = userAvatars[row.SenderID]
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}
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if row.SenderType == "admin" {
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name = adminNames[row.SenderID]
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}
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items = append(items, MessageDTO{
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ID: row.ID,
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ConversationID: row.ConversationID,
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SenderType: row.SenderType,
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SenderID: row.SenderID,
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SenderRole: row.SenderRole,
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SenderName: fallbackName(row.SenderType, row.SenderID, name),
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SenderAvatar: avatar,
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IsSelf: row.SenderType == principal.Type && row.SenderID == principal.ID,
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ContentType: row.ContentType,
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Content: row.Content,
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AttachmentURLS: decodeStringList(row.AttachmentURLS),
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CreatedAt: row.CreatedAt,
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})
|
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}
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return items, nil
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}
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func (r *Repository) participantNames(rows []model.ChatParticipant) (map[uint64]string, map[uint64]string, map[uint64]string, error) {
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userIDs := make([]uint64, 0)
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adminIDs := make([]uint64, 0)
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for _, row := range rows {
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if row.ParticipantType == "user" {
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userIDs = append(userIDs, row.ParticipantID)
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}
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if row.ParticipantType == "admin" {
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adminIDs = append(adminIDs, row.ParticipantID)
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}
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}
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userNames, userAvatars, err := r.userNames(userIDs)
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if err != nil {
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return nil, nil, nil, err
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}
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adminNames, err := r.adminNames(adminIDs)
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if err != nil {
|
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return nil, nil, nil, err
|
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}
|
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return userNames, userAvatars, adminNames, nil
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}
|
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|
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func (r *Repository) userNames(ids []uint64) (map[uint64]string, map[uint64]string, error) {
|
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names := map[uint64]string{}
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avatars := map[uint64]string{}
|
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if len(ids) == 0 {
|
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return names, avatars, nil
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}
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var users []model.User
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if err := r.db.Where("id IN ?", uniqueIDs(ids)).Find(&users).Error; err != nil {
|
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return nil, nil, err
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}
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for _, user := range users {
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name := user.Nickname
|
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if name == "" {
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name = user.Phone
|
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}
|
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names[user.ID] = name
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avatars[user.ID] = user.AvatarURL
|
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}
|
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return names, avatars, nil
|
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}
|
|
|
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func (r *Repository) adminNames(ids []uint64) (map[uint64]string, error) {
|
|
names := map[uint64]string{}
|
|
if len(ids) == 0 {
|
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return names, nil
|
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}
|
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var admins []model.AdminUser
|
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if err := r.db.Where("id IN ?", uniqueIDs(ids)).Find(&admins).Error; err != nil {
|
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return nil, err
|
|
}
|
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for _, admin := range admins {
|
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name := admin.Nickname
|
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if name == "" {
|
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name = admin.Username
|
|
}
|
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names[admin.ID] = name
|
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}
|
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return names, nil
|
|
}
|
|
|
|
type conversationRow struct {
|
|
ID uint64
|
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OrderID uint64
|
|
Type string
|
|
Title string
|
|
Status string
|
|
Role string
|
|
LastMessageID *uint64
|
|
LastMessagePreview string
|
|
LastMessageAt *time.Time
|
|
UnreadCount int64
|
|
CreatedAt time.Time
|
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UpdatedAt time.Time
|
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}
|
|
|
|
func (row conversationRow) toDTO(participants []ParticipantDTO) ConversationDTO {
|
|
return ConversationDTO{
|
|
ID: row.ID,
|
|
OrderID: row.OrderID,
|
|
Type: row.Type,
|
|
Title: row.Title,
|
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Status: row.Status,
|
|
Role: row.Role,
|
|
Participants: participants,
|
|
LastMessageID: row.LastMessageID,
|
|
LastMessagePreview: row.LastMessagePreview,
|
|
LastMessageAt: row.LastMessageAt,
|
|
UnreadCount: row.UnreadCount,
|
|
CreatedAt: row.CreatedAt,
|
|
UpdatedAt: row.UpdatedAt,
|
|
}
|
|
}
|
|
|
|
func defaultSupportAdminID(tx *gorm.DB) uint64 {
|
|
var cfg model.SystemConfig
|
|
if err := tx.Where("`key` = ?", "chat.default_support_admin_id").First(&cfg).Error; err == nil {
|
|
id, parseErr := strconv.ParseUint(cfg.Value, 10, 64)
|
|
if parseErr == nil && id > 0 && adminActive(tx, id) {
|
|
return id
|
|
}
|
|
}
|
|
var admin model.AdminUser
|
|
if err := tx.Where("status = ?", "active").Order("id ASC").First(&admin).Error; err != nil {
|
|
return ensureDefaultSupportAdmin(tx)
|
|
}
|
|
return admin.ID
|
|
}
|
|
|
|
func ensureDefaultSupportAdmin(tx *gorm.DB) uint64 {
|
|
var count int64
|
|
if err := tx.Model(&model.AdminUser{}).Count(&count).Error; err != nil || count > 0 {
|
|
return 0
|
|
}
|
|
hash, err := bcrypt.GenerateFromPassword([]byte(defaultSupportPassword), bcrypt.DefaultCost)
|
|
if err != nil {
|
|
return 0
|
|
}
|
|
admin := model.AdminUser{
|
|
Username: defaultSupportUsername,
|
|
PasswordHash: string(hash),
|
|
Nickname: defaultSupportNickname,
|
|
Status: "active",
|
|
}
|
|
if err := tx.Create(&admin).Error; err != nil {
|
|
return 0
|
|
}
|
|
return admin.ID
|
|
}
|
|
|
|
func adminActive(tx *gorm.DB, id uint64) bool {
|
|
var count int64
|
|
if err := tx.Model(&model.AdminUser{}).Where("id = ? AND status = ?", id, "active").Count(&count).Error; err != nil {
|
|
return false
|
|
}
|
|
return count > 0
|
|
}
|
|
|
|
func orderConversationTitle(order model.RentalOrder) string {
|
|
if order.OrderNo == "" {
|
|
return fmt.Sprintf("订单群聊 #%d", order.ID)
|
|
}
|
|
return "订单群聊 " + order.OrderNo
|
|
}
|
|
|
|
func normalizePagination(page, pageSize int) (int, int) {
|
|
if page < 1 {
|
|
page = 1
|
|
}
|
|
if pageSize < 1 {
|
|
pageSize = 20
|
|
}
|
|
if pageSize > 100 {
|
|
pageSize = 100
|
|
}
|
|
return page, pageSize
|
|
}
|
|
|
|
func truncatePreview(content string) string {
|
|
runes := []rune(content)
|
|
if len(runes) <= 80 {
|
|
return content
|
|
}
|
|
return string(runes[:80])
|
|
}
|
|
|
|
func fallbackName(participantType string, id uint64, name string) string {
|
|
if name != "" {
|
|
return name
|
|
}
|
|
switch participantType {
|
|
case "admin":
|
|
return "客服"
|
|
case "system":
|
|
return "系统"
|
|
default:
|
|
return fmt.Sprintf("用户%d", id)
|
|
}
|
|
}
|
|
|
|
func uniqueIDs(ids []uint64) []uint64 {
|
|
seen := map[uint64]bool{}
|
|
result := make([]uint64, 0, len(ids))
|
|
for _, id := range ids {
|
|
if id == 0 || seen[id] {
|
|
continue
|
|
}
|
|
seen[id] = true
|
|
result = append(result, id)
|
|
}
|
|
return result
|
|
}
|
|
|
|
func emptyJSONList() datatypes.JSON {
|
|
raw, _ := json.Marshal([]string{})
|
|
return datatypes.JSON(raw)
|
|
}
|
|
|
|
func decodeStringList(raw datatypes.JSON) []string {
|
|
if len(raw) == 0 {
|
|
return []string{}
|
|
}
|
|
var items []string
|
|
if err := json.Unmarshal(raw, &items); err != nil {
|
|
return []string{}
|
|
}
|
|
return items
|
|
}
|