项目初始化

internal/service/upload_service.go

@@ -0,0 +1,121 @@
+package service
+
+import (
+	"FileRelay/internal/bootstrap"
+	"FileRelay/internal/config"
+	"FileRelay/internal/model"
+	"FileRelay/internal/storage"
+	"context"
+	"crypto/rand"
+	"fmt"
+	"math/big"
+	"mime/multipart"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type UploadService struct {
+	db *gorm.DB
+}
+
+func NewUploadService() *UploadService {
+	return &UploadService{db: bootstrap.DB}
+}
+
+func (s *UploadService) CreateBatch(ctx context.Context, files []*multipart.FileHeader, remark string, expireType string, expireValue interface{}) (*model.FileBatch, error) {
+	// 1. 生成取件码
+	pickupCode, err := s.generatePickupCode(config.GlobalConfig.Security.PickupCodeLength)
+	if err != nil {
+		return nil, err
+	}
+
+	// 2. 准备 Batch
+	batch := &model.FileBatch{
+		PickupCode: pickupCode,
+		Remark:     remark,
+		ExpireType: expireType,
+		Status:     "active",
+	}
+
+	switch expireType {
+	case "time":
+		if days, ok := expireValue.(int); ok {
+			expireAt := time.Now().Add(time.Duration(days) * 24 * time.Hour)
+			batch.ExpireAt = &expireAt
+		}
+	case "download":
+		if max, ok := expireValue.(int); ok {
+			batch.MaxDownloads = max
+		}
+	}
+
+	// 3. 处理文件上传
+	return batch, s.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Create(batch).Error; err != nil {
+			return err
+		}
+
+		for _, fileHeader := range files {
+			fileItem, err := s.processFile(ctx, tx, batch.ID, fileHeader)
+			if err != nil {
+				return err
+			}
+			batch.FileItems = append(batch.FileItems, *fileItem)
+		}
+		return nil
+	})
+}
+
+func (s *UploadService) processFile(ctx context.Context, tx *gorm.DB, batchID uint, fileHeader *multipart.FileHeader) (*model.FileItem, error) {
+	file, err := fileHeader.Open()
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	// 生成唯一存储路径
+	ext := filepath.Ext(fileHeader.Filename)
+	storagePath := fmt.Sprintf("%d/%s%s", batchID, uuid.New().String(), ext)
+
+	// 保存到存储层
+	if err := storage.GlobalStorage.Save(ctx, storagePath, file); err != nil {
+		return nil, err
+	}
+
+	// 创建数据库记录
+	item := &model.FileItem{
+		BatchID:      batchID,
+		OriginalName: fileHeader.Filename,
+		StoragePath:  storagePath,
+		Size:         fileHeader.Size,
+		MimeType:     fileHeader.Header.Get("Content-Type"),
+	}
+
+	if err := tx.Create(item).Error; err != nil {
+		return nil, err
+	}
+
+	return item, nil
+}
+
+func (s *UploadService) generatePickupCode(length int) (string, error) {
+	const charset = "0123456789"
+	b := make([]byte, length)
+	for i := range b {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
+		if err != nil {
+			return "", err
+		}
+		b[i] = charset[num.Int64()]
+	}
+	// 检查是否冲突
+	var count int64
+	s.db.Model(&model.FileBatch{}).Where("pickup_code = ? AND status = ?", string(b), "active").Count(&count)
+	if count > 0 {
+		return s.generatePickupCode(length) // 递归生成
+	}
+	return string(b), nil
+}