blog_backend_api/controller/file.go

package controller

import (
	"github.com/gin-gonic/gin"
	uuid "github.com/satori/go.uuid"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
)

type FileController struct {
}

func (this *FileController) OnUpload(c *gin.Context) {
	uid,e := uuid.NewV1()
	if nil != e{
		log.Print(e.Error())
		return
	}

	file, _, err := c.Request.FormFile("image")
	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
	if strings.Contains(types,"jpeg"){
		defer file.Close()
		out, err := os.Create("image/" + uid.String() + ".jpg")
		if err != nil {
			log.Fatal(err)
		}
		defer out.Close()
		out.Write(bytes)
		log.Print(len(bytes))
		c.JSON(200, map[string] interface{}{"url":uid.String() + ".jpg" })
	}
	if strings.Contains(types,"png"){
		defer file.Close()
		out, err := os.Create("image/" + uid.String() + ".png")
		if err != nil {
			log.Fatal(err)
		}
		defer out.Close()
		out.Write(bytes)
		log.Print(len(bytes))
		c.JSON(200, map[string] interface{}{"url":uid.String() + ".png" })
	}
	if strings.Contains(types,"gif"){
		defer file.Close()
		out, err := os.Create("image/" + uid.String() + ".gif")
		if err != nil {
			log.Fatal(err)
		}
		defer out.Close()
		out.Write(bytes)
		log.Print(len(bytes))
		c.JSON(200, map[string] interface{}{"url":uid.String() + ".gif" } )
	}
}

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("/home/ubuntu/api/bin/image/" +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-Type","image/png")
	c.Header("Content-Disposition",
		"/image/" +fileName)
	c.Writer.Write(bytes)
}