background/controller/file.go

package controller

import (
	"background/utils"
	"image"
	"image/color"
	"image/jpeg"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"github.com/disintegration/imaging"
	"github.com/gin-gonic/gin"
	json "github.com/json-iterator/go"
	"github.com/nfnt/resize"
	uuid "github.com/satori/go.uuid"

	// "github.com/nfnt/resize"
	// "image/jpeg"
	"image/gif"
	// "strings"
)

type FileController struct {
}

func (this *FileController) OnUpload(c *gin.Context) {
	uid,e := uuid.NewV1()
	if nil != e{
		log.Print(e.Error())
		return
	}
	imgtype := c.Query("type")
	log.Print(imgtype)
	file, _, err := c.Request.FormFile("image")
	if nil != err || nil == file{
		log.Print(err.Error())
		return
	}
	
	if imgtype == "gif"{
		allgifs,er := gif.DecodeAll(file)
		if nil != er{
			log.Print("decode error",er.Error())
			return
		}

		datout, err := os.Create("image/" + uid.String() + ".gif" )
		defer datout.Close()
		if err != nil {
			log.Fatal(err)
			return
		}

		gif.EncodeAll(datout,allgifs)
		c.JSON(200, map[string] interface{}{"url":uid.String() + ".gif"  } )
	}else{
		img, name, err := image.Decode(file)
		if nil != err{
			log.Print(err.Error())
			return
		}
		dx := img.Bounds().Dx()
		// resize to width 1000 using Lanczos resampling
		// and preserve aspect ratio
		if(dx > 800){
			dx = dx / 2;
		}
		m := resize.Resize(uint(dx), 0, img, resize.Lanczos3)

		datout, err := os.Create("image/" + uid.String() + "." + name)
		defer datout.Close()
		if err != nil {
			log.Fatal(err)
		}
		jpeg.Encode(datout, m, nil)
		c.JSON(200, map[string] interface{}{"url":uid.String() + "." + name } )
	}
	
}

func (this *FileController) FileList(c *gin.Context) {
	var nodes utils.FileDesc
	path := c.Query("path")
	utils.GetPathFileName("files\\" + path,&nodes)
	log.Print(nodes)
	bs,e := json.Marshal(nodes)
	if nil != e{
		log.Print(e.Error())
	}
	log.Print(string(bs))
	c.JSON(200,map[string]interface{}{
		"msg":"ok",
		"status":200,
		"files":nodes,
	})
}

func (this *FileController) FileType(c *gin.Context) {

}

func (this *FileController) DownloadFile(c *gin.Context) {
	resp := RespBase{Msg:"FAIL",Status: 211}
	filename := c.Query("filename")
	file,e := os.Open( "files//" +filename)
	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)
		return
	}
	bytes,e :=ioutil.ReadAll(file)
	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)
		return
	}
	c.Header("X-Content-Type-Options", "nosniff")
	c.Header("Content-Disposition",
		"/files/" + filename)
	c.Writer.Write(bytes)

}

func (this *FileController) OnFileUploadFile(c *gin.Context) {
	path := c.Query("path")
	filename := c.Query("filename")
	file, _, err := c.Request.FormFile("file")
	if nil != err || nil == file{
		log.Print(err.Error())
		return
	}
	bytes,err := ioutil.ReadAll(file)
	if nil != err{
		log.Print(err.Error())
		return
	}
	header := make([]byte,512)
	copy(header,bytes)
	types := http.DetectContentType(header)
	log.Print(types)
	// jpg
	defer file.Close()
	out, err := os.Create("files/" +  path +  "/" + filename)
	if err != nil {
		log.Print(err)
	}
	defer out.Close()
	out.Write(bytes)
	log.Print(len(bytes))
	c.JSON(200, map[string] interface{}{"msg": "ok" })
}

func (this *FileController) OnThumbnail(c *gin.Context) {
	resp := RespBase{Msg:"FAIL",Status: 211}

	fileName := c.Param("file")
	if "" == fileName{
		c.JSON(200,resp)

		return
	}
	// input files
	files := []string{"/home/ubuntu/api/bin/image/" +fileName}

	// load images and make 100x100 thumbnails of them
	var thumbnails []image.Image
	for _, file := range files {
		img, err := imaging.Open(file)
		if err != nil {
			panic(err)
		}
		thumb := imaging.Thumbnail(img, 100, 100, imaging.CatmullRom)
		thumbnails = append(thumbnails, thumb)
	}

	// create a new blank image
	dst := imaging.New(100*len(thumbnails), 100, color.NRGBA{0, 0, 0, 0})

	// paste thumbnails into the new image side by side
	for i, thumb := range thumbnails {
		dst = imaging.Paste(dst, thumb, image.Pt(i*100, 0))
	}

	// save the combined image to file
	err := imaging.Save(dst, "/home/ubuntu/api/bin/image/thumbnail_" + fileName)
	if err != nil {
		log.Print(err.Error())
		return
	}
	// open file
	file,e := os.Open("/home/ubuntu/api/bin/image/thumbnail_" + fileName)
	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)

		return
	}
	defer file.Close()
	bytes,e :=ioutil.ReadAll(file)
	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)

		return
	}
	c.Header("X-Content-Type-Options", "nosniff")
	c.Header("Content-Type","image/png")
	c.Header("Content-Disposition",
		"/image/" +fileName)
	c.Writer.Write(bytes)
}


func (this *FileController)  OnDownLoad(c *gin.Context) {
	resp := RespBase{Msg:"FAIL",Status: 211}

	fileName := c.Param("file")
	if "" == fileName{
		c.JSON(200,resp)

		return
	}
	file,e := os.Open(utils.GetCurrentDirectory() + "/image/" +fileName)

	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)

		return
	}
	defer file.Close()
	bytes,e :=ioutil.ReadAll(file)
	if nil != e{
		log.Print(e.Error())
		c.JSON(200,resp)

		return
	}
	c.Header("X-Content-Type-Options", "nosniff")
	c.Header("Content-Type","image/png")
	c.Header("Content-Disposition",
		"/image/" +fileName)
	c.Writer.Write(bytes)
}