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package Preview
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import (
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"dsSupport/Const"
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"dsSupport/Utils/CommonUtil"
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"dsSupport/Utils/FileUtil"
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"dsSupport/Utils/ObsUtil"
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"encoding/base64"
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"github.com/gin-gonic/gin"
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"io"
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"net/http"
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"os"
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"path"
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"strings"
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)
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//模块的路由配置
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func Routers(r *gin.RouterGroup) {
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rr := r.Group("/preview")
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//配置接口
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rr.GET("/previewOffice", previewOffice)
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return
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}
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// http://127.0.0.1:9000/dsSupport/preview/previewOffice
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/**
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功能：提供Office系列文件的预览功能
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作者：黄海
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时间：2020-07-15
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*/
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func previewOffice(c *gin.Context) {
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// 允许预览的扩展名
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allowExtension := []string{`doc`, `docx`, `rtf`, `xls`, `xlsx`, `ppt`, `pptx`,
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`pdf`, `zip`, `rar`, `7z`, `png`, `jpg`, `jpeg`, `wps`, `txt`, `js`, `json`, `css`, `sql`, `xml`, `java`, `cs`}
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//本地物理路径
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uEnc := c.Query("p")
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uDec, err := base64.URLEncoding.DecodeString(uEnc)
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if err != nil {
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c.String(http.StatusOK, "输入的参数p转为base64Url时失败，请确认是否未经Base64.URLEdcoding进行加码!")
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return
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}
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fullPath := string(uDec)
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//判断是不是华为云上存在，原则上存在就不需要再次上传了~
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tempArray:=strings.Split(strings.Replace(strings.ToLower(fullPath),"\\","/",-1),"/")
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fiName:=tempArray[len(tempArray)-1]
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key := Const.PreviewPrefix + fiName
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url := "http://ow365.cn/?i=14531&fname=" + fiName + "&furl=http%3A%2F%2Fvideo.edusoa.com%2F" + key
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//如果存在，则直接返回
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if ObsUtil.IsExist(fiName){
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//输出预览地址
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c.String(http.StatusOK, url)
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//fmt.Println("文件已在云存储中存在，无需下载和上传！")
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return
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}
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//(1) 是否以http或https开头
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if strings.HasPrefix(strings.ToLower(fullPath), "https://") || strings.HasPrefix(strings.ToLower(fullPath), "http://") {
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//文件名称
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arr := strings.Split(fullPath, "/")
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fi := arr[len(arr)-1]
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if !CommonUtil.IsContainString(allowExtension,"."+path.Ext(fi)){
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c.String(http.StatusOK, "输入的预览文件格式，系统不支持!")
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return
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}
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//准备下载
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res, err := http.Get(fullPath)
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if err != nil {
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c.String(http.StatusOK, "输入的网络地址无法找到，不能进行预览!")
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return
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}
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fullPath = CommonUtil.GetCurrentPath() + "/TempFiles/" + fi
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if FileUtil.Exists(fullPath) {
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os.Remove(fullPath)
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}
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f, err := os.Create(fullPath)
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if err != nil {
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c.String(http.StatusOK, "创建文件时发生读写错误:"+err.Error())
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return
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}
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io.Copy(f, res.Body)
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}
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//(2) 是不是本地文件
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//判断是不是本地存在
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isExist, err := CommonUtil.PathExists(fullPath)
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if err != nil {
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c.String(http.StatusOK, "发生严重错误："+err.Error())
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return
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}
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if !isExist {
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c.String(http.StatusOK, "输入的文件无法找到!")
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return
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}
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//将文件上传到华为云
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ObsUtil.UploadFileMultiPart(key, fullPath)
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//输出预览地址
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c.String(http.StatusOK, url)
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}
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