140 lines
3.5 KiB
Go
140 lines
3.5 KiB
Go
package rest
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import (
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"fmt"
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"net/http"
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"time"
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)
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//@Service
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type AlienService struct {
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Bean
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matterDao *MatterDao
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matterService *MatterService
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userDao *UserDao
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uploadTokenDao *UploadTokenDao
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downloadTokenDao *DownloadTokenDao
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imageCacheDao *ImageCacheDao
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imageCacheService *ImageCacheService
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}
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//初始化方法
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func (this *AlienService) Init() {
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this.Bean.Init()
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//手动装填本实例的Bean. 这里必须要用中间变量方可。
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b := CONTEXT.GetBean(this.matterDao)
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if b, ok := b.(*MatterDao); ok {
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this.matterDao = b
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}
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b = CONTEXT.GetBean(this.matterService)
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if b, ok := b.(*MatterService); ok {
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this.matterService = b
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}
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b = CONTEXT.GetBean(this.userDao)
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if b, ok := b.(*UserDao); ok {
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this.userDao = b
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}
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b = CONTEXT.GetBean(this.uploadTokenDao)
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if c, ok := b.(*UploadTokenDao); ok {
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this.uploadTokenDao = c
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}
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b = CONTEXT.GetBean(this.downloadTokenDao)
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if c, ok := b.(*DownloadTokenDao); ok {
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this.downloadTokenDao = c
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}
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b = CONTEXT.GetBean(this.imageCacheDao)
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if c, ok := b.(*ImageCacheDao); ok {
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this.imageCacheDao = c
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}
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b = CONTEXT.GetBean(this.imageCacheService)
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if c, ok := b.(*ImageCacheService); ok {
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this.imageCacheService = c
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}
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}
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//预览或者下载的统一处理.
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func (this *AlienService) PreviewOrDownload(
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writer http.ResponseWriter,
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request *http.Request,
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uuid string,
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filename string,
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withContentDisposition bool) {
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matter := this.matterDao.CheckByUuid(uuid)
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//判断是否是文件夹
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if matter.Dir {
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panic("不支持下载文件夹")
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}
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if matter.Name != filename {
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panic("文件信息错误")
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}
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//验证用户的权限问题。
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//文件如果是私有的才需要权限
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if matter.Privacy {
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//1.如果带有downloadTokenUuid那么就按照token的信息去获取。
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downloadTokenUuid := request.FormValue("downloadTokenUuid")
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if downloadTokenUuid != "" {
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downloadToken := this.downloadTokenDao.CheckByUuid(downloadTokenUuid)
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if downloadToken.ExpireTime.Before(time.Now()) {
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panic("downloadToken已失效")
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}
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if downloadToken.MatterUuid != uuid {
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panic("token和文件信息不一致")
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}
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tokenUser := this.userDao.CheckByUuid(downloadToken.UserUuid)
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if matter.UserUuid != tokenUser.Uuid {
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panic(CODE_WRAPPER_UNAUTHORIZED)
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}
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//下载之后立即过期掉。如果是分块下载的，必须以最终获取到完整的数据为准。
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downloadToken.ExpireTime = time.Now()
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this.downloadTokenDao.Save(downloadToken)
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} else {
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//判断文件的所属人是否正确
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operator := this.findUser(writer, request)
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if operator == nil || (operator.Role != USER_ROLE_ADMINISTRATOR && matter.UserUuid != operator.Uuid) {
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panic(CODE_WRAPPER_UNAUTHORIZED)
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}
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}
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}
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//对图片处理。
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needProcess, imageResizeM, imageResizeW, imageResizeH := this.imageCacheService.ResizeParams(request)
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if needProcess {
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//如果是图片，那么能用缓存就用缓存
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imageCache := this.imageCacheDao.FindByMatterUuidAndMode(matter.Uuid, fmt.Sprintf("%s_%d_%d", imageResizeM, imageResizeW, imageResizeH))
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if imageCache == nil {
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imageCache = this.imageCacheService.cacheImage(writer, request, matter)
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}
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//直接使用缓存中的信息
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this.matterService.DownloadFile(writer, request, CONFIG.MatterPath+imageCache.Path, matter.Name, withContentDisposition)
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} else {
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this.matterService.DownloadFile(writer, request, CONFIG.MatterPath+matter.Path, matter.Name, withContentDisposition)
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}
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//文件下载次数加一，为了加快访问速度，异步进行
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go SafeMethod(func() {
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this.matterDao.TimesIncrement(uuid)
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})
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}
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