245 lines
6.7 KiB
Go
245 lines
6.7 KiB
Go
package code
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import (
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"fmt"
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"github.com/disintegration/imaging"
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"image"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"tank/code/tool"
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)
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//@Service
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type ImageCacheService struct {
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Bean
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imageCacheDao *ImageCacheDao
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userDao *UserDao
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matterDao *MatterDao
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}
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//初始化方法
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func (this *ImageCacheService) 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.imageCacheDao)
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if b, ok := b.(*ImageCacheDao); ok {
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this.imageCacheDao = 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.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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}
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//获取某个文件的详情，会把父级依次倒着装进去。如果中途出错，直接抛出异常。
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func (this *ImageCacheService) Detail(uuid string) *ImageCache {
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imageCache := this.imageCacheDao.CheckByUuid(uuid)
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return imageCache
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}
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//获取预处理时必要的参数
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func (this *ImageCacheService) ResizeParams(request *http.Request) (needProcess bool, resizeMode string, resizeWidth int, resizeHeight int) {
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var err error
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//1.0 模式准备逐步废弃掉
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if request.FormValue("imageProcess") == "resize" {
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//老模式使用 imageResizeM,imageResizeW,imageResizeH
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imageResizeM := request.FormValue("imageResizeM")
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if imageResizeM == "" {
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imageResizeM = "fit"
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} else if imageResizeM != "fit" && imageResizeM != "fill" && imageResizeM != "fixed" {
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panic("imageResizeM参数错误")
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}
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imageResizeWStr := request.FormValue("imageResizeW")
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var imageResizeW int
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if imageResizeWStr != "" {
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imageResizeW, err = strconv.Atoi(imageResizeWStr)
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this.PanicError(err)
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if imageResizeW < 1 || imageResizeW > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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imageResizeHStr := request.FormValue("imageResizeH")
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var imageResizeH int
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if imageResizeHStr != "" {
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imageResizeH, err = strconv.Atoi(imageResizeHStr)
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this.PanicError(err)
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if imageResizeH < 1 || imageResizeH > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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return true, imageResizeM, imageResizeW, imageResizeH
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} else if request.FormValue("ir") != "" {
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//新模式使用 mode_w_h 如果w或者h为0表示这项值不设置
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imageResizeStr := request.FormValue("ir")
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arr := strings.Split(imageResizeStr, "_")
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if len(arr) != 3 {
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panic("参数不符合规范，格式要求为mode_w_h")
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}
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imageResizeM := arr[0]
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if imageResizeM == "" {
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imageResizeM = "fit"
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} else if imageResizeM != "fit" && imageResizeM != "fill" && imageResizeM != "fixed" {
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panic("imageResizeM参数错误")
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}
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imageResizeWStr := arr[1]
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var imageResizeW int
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if imageResizeWStr != "" {
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imageResizeW, err = strconv.Atoi(imageResizeWStr)
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this.PanicError(err)
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if imageResizeW < 0 || imageResizeW > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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imageResizeHStr := arr[2]
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var imageResizeH int
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if imageResizeHStr != "" {
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imageResizeH, err = strconv.Atoi(imageResizeHStr)
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this.PanicError(err)
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if imageResizeH < 0 || imageResizeH > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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return true, imageResizeM, imageResizeW, imageResizeH
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} else {
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return false, "", 0, 0
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}
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}
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//图片预处理功能。
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func (this *ImageCacheService) ResizeImage(request *http.Request, filePath string) *image.NRGBA {
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diskFile, err := os.Open(filePath)
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this.PanicError(err)
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defer func() {
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e := diskFile.Close()
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this.PanicError(e)
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}()
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_, imageResizeM, imageResizeW, imageResizeH := this.ResizeParams(request)
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//单边缩略
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if imageResizeM == "fit" {
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//将图缩略成宽度为100，高度按比例处理。
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if imageResizeW != 0 {
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Resize(src, imageResizeW, 0, imaging.Lanczos)
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} else if imageResizeH != 0 {
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//将图缩略成高度为100，宽度按比例处理。
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Resize(src, 0, imageResizeH, imaging.Lanczos)
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} else {
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panic("单边缩略必须指定宽或者高")
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}
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} else if imageResizeM == "fill" {
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//固定宽高，自动裁剪
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if imageResizeW > 0 && imageResizeH > 0 {
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Fill(src, imageResizeW, imageResizeH, imaging.Center, imaging.Lanczos)
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} else {
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panic("固定宽高，自动裁剪 必须同时指定宽和高")
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}
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} else if imageResizeM == "fixed" {
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//强制宽高缩略
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if imageResizeW > 0 && imageResizeH > 0 {
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Resize(src, imageResizeW, imageResizeH, imaging.Lanczos)
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} else {
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panic("强制宽高缩略必须同时指定宽和高")
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}
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} else {
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panic("不支持" + imageResizeM + "处理模式")
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}
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}
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//缓存一张图片
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func (this *ImageCacheService) cacheImage(writer http.ResponseWriter, request *http.Request, matter *Matter) *ImageCache {
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//当前的文件是否是图片，只有图片才能处理。
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extension := tool.GetExtension(matter.Name)
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formats := map[string]imaging.Format{
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".jpg": imaging.JPEG,
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".jpeg": imaging.JPEG,
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".png": imaging.PNG,
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".tif": imaging.TIFF,
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".tiff": imaging.TIFF,
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".bmp": imaging.BMP,
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".gif": imaging.GIF,
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}
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_, imageResizeM, imageResizeW, imageResizeH := this.ResizeParams(request)
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mode := fmt.Sprintf("%s_%d_%d", imageResizeM, imageResizeW, imageResizeH)
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format, ok := formats[extension]
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if !ok {
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panic("该图片格式不支持处理")
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}
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user := this.userDao.FindByUuid(matter.UserUuid)
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//resize图片
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dstImage := this.ResizeImage(request, matter.AbsolutePath())
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cacheImageName := tool.GetSimpleFileName(matter.Name) + "_" + mode + extension
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cacheImageRelativePath := tool.GetSimpleFileName(matter.Path) + "_" + mode + extension
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cacheImageAbsolutePath := GetUserCacheRootDir(user.Username) + tool.GetSimpleFileName(matter.Path) + "_" + mode + extension
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//创建目录。
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dir := filepath.Dir(cacheImageAbsolutePath)
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tool.MakeDirAll(dir)
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fileWriter, err := os.Create(cacheImageAbsolutePath)
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this.PanicError(err)
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defer func() {
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e := fileWriter.Close()
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this.PanicError(e)
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}()
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//处理后的图片存放在本地
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err = imaging.Encode(fileWriter, dstImage, format)
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this.PanicError(err)
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//获取新文件的大小
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fileInfo, err := fileWriter.Stat()
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this.PanicError(err)
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//相关信息写到缓存中去
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imageCache := &ImageCache{
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Name: cacheImageName,
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UserUuid: matter.UserUuid,
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Username: user.Username,
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MatterUuid: matter.Uuid,
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MatterName: matter.Name,
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Mode: mode,
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Size: fileInfo.Size(),
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Path: cacheImageRelativePath,
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}
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this.imageCacheDao.Create(imageCache)
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return imageCache
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}
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