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package model
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import (
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"fmt"
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v1 "moredoc/api/v1"
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"time"
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"go.uber.org/zap"
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"gorm.io/gorm"
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)
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type Download struct {
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Id int64 `form:"id" json:"id,omitempty" gorm:"primaryKey;autoIncrement;column:id;comment:;"`
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UserId int64 `form:"user_id" json:"user_id,omitempty" gorm:"column:user_id;type:bigint(20);size:20;default:0;index:idx_user_id;comment:下载文档的用户ID;"`
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DocumentId int64 `form:"document_id" json:"document_id,omitempty" gorm:"column:document_id;type:bigint(20);size:20;index:idx_document_id;default:0;comment:被下载的文档ID;"`
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Ip string `form:"ip" json:"ip,omitempty" gorm:"column:ip;type:varchar(64);size:64;index:idx_ip;comment:下载文档的用户IP;"`
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IsPay bool `form:"is_pay" json:"is_pay,omitempty" gorm:"column:is_pay;type:tinyint(1);size:1;default:0;comment:是否付费下载;"`
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CreatedAt *time.Time `form:"created_at" json:"created_at,omitempty" gorm:"column:created_at;type:datetime;comment:创建时间;index:idx_created_at"`
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UpdatedAt *time.Time `form:"updated_at" json:"updated_at,omitempty" gorm:"column:updated_at;type:datetime;comment:更新时间;"`
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}
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func (Download) TableName() string {
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return tablePrefix + "download"
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}
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// CreateDownload 创建Download
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func (m *DBModel) CreateDownload(download *Download) (err error) {
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tx := m.db.Begin()
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defer func() {
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if err != nil {
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tx.Rollback()
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} else {
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tx.Commit()
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}
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}()
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err = tx.Create(download).Error
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if err != nil {
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m.logger.Error("CreateDownload", zap.Error(err))
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return
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}
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err = tx.Model(&Document{}).Where("id = ?", download.DocumentId).Update("download_count", gorm.Expr("download_count + ?", 1)).Error
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if err != nil {
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m.logger.Error("CreateDownload", zap.Error(err))
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return
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}
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doc, _ := m.GetDocument(download.DocumentId, "id", "user_id", "price")
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if download.IsPay && doc.Price > 0 && download.UserId > 0 {
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// 下载该文档的用户扣除积分
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err = tx.Model(&User{}).Where("id = ?", download.UserId).Update("credit_count", gorm.Expr("credit_count - ?", doc.Price)).Error
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if err != nil {
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m.logger.Error("CreateDownload", zap.Error(err))
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return
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}
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// 文档的作者增加积分
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err = tx.Model(&User{}).Where("id = ?", doc.UserId).Update("credit_count", gorm.Expr("credit_count + ?", doc.Price)).Error
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if err != nil {
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m.logger.Error("CreateDownload", zap.Error(err))
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return
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}
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}
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return
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}
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// GetDownload 根据id获取Download
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func (m *DBModel) GetDownload(id interface{}, fields ...string) (download Download, err error) {
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db := m.db
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fields = m.FilterValidFields(Download{}.TableName(), fields...)
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if len(fields) > 0 {
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db = db.Select(fields)
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}
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err = db.Where("id = ?", id).First(&download).Error
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return
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}
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type OptionGetDownloadList struct {
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Page int
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Size int
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WithCount bool // 是否返回总数
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Ids []interface{} // id列表
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QueryIn map[string][]interface{} // map[field][]{value1,value2,...}
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}
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// GetDownloadList 获取Download列表
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func (m *DBModel) GetDownloadList(opt *OptionGetDownloadList) (downloadList []*v1.Download, total int64, err error) {
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var (
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tableDownload = Download{}.TableName()
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tableDocument = Document{}.TableName()
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)
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db := m.db.Model(&Download{})
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db = m.generateQueryIn(db, tableDownload+" "+tableDownload /* 加上表别名,防止字段冲突 */, opt.QueryIn)
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if len(opt.Ids) > 0 {
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db = db.Where(fmt.Sprintf("%s.id in (?)", tableDownload), opt.Ids)
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}
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db = db.Joins(
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fmt.Sprintf(
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"left join %s on %s.document_id = %s.id",
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tableDocument, tableDownload, tableDocument,
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)).
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Where(fmt.Sprintf("%s.id > ?", tableDocument), 0)
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if opt.WithCount {
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err = db.Count(&total).Error
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if err != nil {
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m.logger.Error("GetDownloadList", zap.Error(err))
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return
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}
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}
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// size 为了避免字段冲突,加上了后缀_,即 size_
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db = db.Select(fmt.Sprintf("%s.*, %s.*, %s.size as size_", tableDocument, tableDownload, tableDocument))
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db = db.Order(fmt.Sprintf("%s.id desc", tableDownload))
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db = db.Offset((opt.Page - 1) * opt.Size).Limit(opt.Size)
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err = db.Find(&downloadList).Error
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if err != nil && err != gorm.ErrRecordNotFound {
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m.logger.Error("GetDownloadList", zap.Error(err))
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}
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return
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}
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// CanIFreeDownload 判断用户是否可以免费下载
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// 最后一次付费下载时间 + 免费下载时长 > 当前时间
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func (m *DBModel) CanIFreeDownload(userId, documentId int64) bool {
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var download Download
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m.db.Where("user_id = ? and document_id = ? and is_pay = ?", userId, documentId, 1).Last(&download)
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m.logger.Debug("CanIFreeDownload", zap.Any("Last Download", download))
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if download.Id == 0 {
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return false
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}
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cfg := m.GetConfigOfDownload(ConfigDownloadFreeDownloadDuration)
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m.logger.Debug("CanIFreeDownload", zap.Int32("FreeDownloadDuration", cfg.FreeDownloadDuration))
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if cfg.FreeDownloadDuration <= 0 {
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return true
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}
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m.logger.Debug("CanIFreeDownload", zap.Any("CreatedAt", download.CreatedAt), zap.Time("Now", time.Now()), zap.Time("After", download.CreatedAt.Add(time.Duration(cfg.FreeDownloadDuration)*time.Hour*24)))
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return download.CreatedAt.Add(time.Duration(cfg.FreeDownloadDuration) * time.Hour * 24).After(time.Now())
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}
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// CountDownloadToday 统计用户今日下载次数
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func (m *DBModel) CountDownloadTodayForUser(userId int64) (total int64) {
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if userId == 0 {
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return
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}
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err := m.db.Model(&Download{}).Where("user_id = ?", userId).Where("created_at >= ?", time.Now().Format("2006-01-02")).Count(&total).Error
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if err != nil {
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m.logger.Error("CountDownloadToday", zap.Error(err))
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}
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return
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}
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// CountDownloadToday 统计IP今日下载次数
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func (m *DBModel) CountDownloadTodayForIP(ip string) (total int64) {
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if ip == "" {
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return
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}
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err := m.db.Model(&Download{}).Where("ip = ?", ip).Where("created_at >= ?", time.Now().Format("2006-01-02")).Count(&total).Error
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if err != nil {
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m.logger.Error("CountDownloadTodayForIP", zap.Error(err))
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}
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return
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}
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