feat: 初始化 ChatGPT Team 管理后端项目

- 添加用户认证模块 (JWT + 密码管理)
- 添加 ChatGPT 账户管理功能
- 添加卡密管理功能 (创建、批量生成、查询)
- 添加邀请功能
- 配置数据库迁移和路由系统

internal/handler/card_key_handler.go

@@ -0,0 +1,213 @@
+package handler
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"net/http"
+	"strings"
+	"time"
+
+	"gpt-manager-go/internal/middleware"
+	"gpt-manager-go/internal/models"
+	"gpt-manager-go/internal/repository"
+)
+
+// CardKeyHandler 卡密处理器
+type CardKeyHandler struct {
+	repo *repository.CardKeyRepository
+}
+
+// NewCardKeyHandler 创建处理器
+func NewCardKeyHandler(repo *repository.CardKeyRepository) *CardKeyHandler {
+	return &CardKeyHandler{repo: repo}
+}
+
+// CreateCardKeyRequest 创建卡密请求
+type CreateCardKeyRequest struct {
+	ValidityDays int `json:"validity_days"` // 有效期天数，默认30
+	MaxUses      int `json:"max_uses"`      // 最大使用次数，默认1
+}
+
+// BatchCreateCardKeyRequest 批量创建卡密请求
+type BatchCreateCardKeyRequest struct {
+	Count        int `json:"count"`         // 创建数量
+	ValidityDays int `json:"validity_days"` // 有效期天数，默认30
+	MaxUses      int `json:"max_uses"`      // 最大使用次数，默认1
+}
+
+// CardKeyResponse 卡密响应
+type CardKeyResponse struct {
+	Success bool              `json:"success"`
+	Message string            `json:"message"`
+	Data    *models.CardKey   `json:"data,omitempty"`
+	Keys    []*models.CardKey `json:"keys,omitempty"`
+}
+
+// Handle 处理卡密接口 (GET: 列表, POST: 创建)
+func (h *CardKeyHandler) Handle(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodGet:
+		h.list(w, r)
+	case http.MethodPost:
+		h.create(w, r)
+	default:
+		respondJSON(w, http.StatusMethodNotAllowed, CardKeyResponse{
+			Success: false,
+			Message: "Method not allowed",
+		})
+	}
+}
+
+// create 创建单个卡密
+func (h *CardKeyHandler) create(w http.ResponseWriter, r *http.Request) {
+
+	var req CreateCardKeyRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		// 允许空请求体，使用默认值
+		req = CreateCardKeyRequest{}
+	}
+
+	// 设置默认值
+	if req.ValidityDays <= 0 {
+		req.ValidityDays = 30
+	}
+	if req.MaxUses <= 0 {
+		req.MaxUses = 1
+	}
+
+	// 获取当前用户
+	claims := middleware.GetUserFromContext(r.Context())
+
+	// 生成卡密
+	cardKey := &models.CardKey{
+		Key:          generateCardKey(),
+		MaxUses:      req.MaxUses,
+		UsedCount:    0,
+		ValidityType: "custom",
+		ExpiresAt:    time.Now().AddDate(0, 0, req.ValidityDays),
+		IsActive:     true,
+		CreatedByID:  claims.UserID,
+		CreatedAt:    time.Now(),
+	}
+
+	if err := h.repo.Create(cardKey); err != nil {
+		respondJSON(w, http.StatusInternalServerError, CardKeyResponse{
+			Success: false,
+			Message: "Failed to create card key: " + err.Error(),
+		})
+		return
+	}
+
+	respondJSON(w, http.StatusCreated, CardKeyResponse{
+		Success: true,
+		Message: "Card key created successfully",
+		Data:    cardKey,
+	})
+}
+
+// BatchCreate 批量创建卡密 (POST /api/cardkeys/batch)
+func (h *CardKeyHandler) BatchCreate(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		respondJSON(w, http.StatusMethodNotAllowed, CardKeyResponse{
+			Success: false,
+			Message: "Method not allowed",
+		})
+		return
+	}
+
+	var req BatchCreateCardKeyRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		respondJSON(w, http.StatusBadRequest, CardKeyResponse{
+			Success: false,
+			Message: "Invalid request body",
+		})
+		return
+	}
+
+	// 验证和设置默认值
+	if req.Count <= 0 {
+		respondJSON(w, http.StatusBadRequest, CardKeyResponse{
+			Success: false,
+			Message: "Count must be greater than 0",
+		})
+		return
+	}
+	if req.Count > 100 {
+		respondJSON(w, http.StatusBadRequest, CardKeyResponse{
+			Success: false,
+			Message: "Count cannot exceed 100",
+		})
+		return
+	}
+	if req.ValidityDays <= 0 {
+		req.ValidityDays = 30
+	}
+	if req.MaxUses <= 0 {
+		req.MaxUses = 1
+	}
+
+	// 获取当前用户
+	claims := middleware.GetUserFromContext(r.Context())
+
+	// 批量创建
+	var createdKeys []*models.CardKey
+	expiresAt := time.Now().AddDate(0, 0, req.ValidityDays)
+
+	for i := 0; i < req.Count; i++ {
+		cardKey := &models.CardKey{
+			Key:          generateCardKey(),
+			MaxUses:      req.MaxUses,
+			UsedCount:    0,
+			ValidityType: "custom",
+			ExpiresAt:    expiresAt,
+			IsActive:     true,
+			CreatedByID:  claims.UserID,
+			CreatedAt:    time.Now(),
+		}
+
+		if err := h.repo.Create(cardKey); err != nil {
+			// 如果创建失败，返回已创建的卡密
+			respondJSON(w, http.StatusInternalServerError, CardKeyResponse{
+				Success: false,
+				Message: "Failed to create some card keys",
+				Keys:    createdKeys,
+			})
+			return
+		}
+		createdKeys = append(createdKeys, cardKey)
+	}
+
+	respondJSON(w, http.StatusCreated, CardKeyResponse{
+		Success: true,
+		Message: "Card keys created successfully",
+		Keys:    createdKeys,
+	})
+}
+
+// list 获取卡密列表
+func (h *CardKeyHandler) list(w http.ResponseWriter, r *http.Request) {
+
+	cardKeys, err := h.repo.FindAll()
+	if err != nil {
+		respondJSON(w, http.StatusInternalServerError, CardKeyResponse{
+			Success: false,
+			Message: "Failed to fetch card keys",
+		})
+		return
+	}
+
+	respondJSON(w, http.StatusOK, CardKeyResponse{
+		Success: true,
+		Message: "OK",
+		Keys:    cardKeys,
+	})
+}
+
+// generateCardKey 生成卡密格式: XXXX-XXXX-XXXX-XXXX
+func generateCardKey() string {
+	bytes := make([]byte, 8)
+	rand.Read(bytes)
+	hex := strings.ToUpper(hex.EncodeToString(bytes))
+	return hex[0:4] + "-" + hex[4:8] + "-" + hex[8:12] + "-" + hex[12:16]
+}