Handlers for imagemagick posting byte array and manipulating

imagemagick.go

import (
	"github.com/astaxie/beego"
	"gopkg.in/gographics/imagick.v2/imagick"
	"encoding/json"
	"log"
)

type ImageController struct {
	beego.Controller
}

type Image struct {
	Data []byte `json:"data"`
}

func (this *ImageController) Get() {
	this.Ctx.WriteString("image")
}

func (this *ImageController) Post() {
	var i Image
    json.Unmarshal(this.Ctx.Input.RequestBody, &i)
    log.Println("processing... ", i.Data)
    im, _ := processContactImage(0, i.Data)
    this.Data["json"] = im
    this.ServeJSON()
}
func processContactImage(idx int, image []byte) ([]byte, error) {
	
	// log.Println("idx: ", idx)
	mw := imagick.NewMagickWand()
	log.Println("reading image blob: ", image)
	err := mw.ReadImageBlob(image)
	if err != nil {
		log.Println("reading blob failed: ", err)
		return []byte{}, err
	}
	log.Println("resize image")
	err = mw.ResizeImage(400, 400, imagick.FILTER_LANCZOS, 1)
	if err != nil {
		log.Println("resizing image failed: ", err)
		return []byte{}, err
	}
	log.Println("compressing image")
	err = mw.SetImageCompressionQuality(95)
	if err != nil {
		log.Println("compressing image failed")
		return []byte{}, err
	}

	dw := imagick.NewDrawingWand()
	cw := imagick.NewPixelWand()

	dw.SetStrokeOpacity(1)

	dw.PushDrawingWand()

	cw.SetColor("red")

	dw.SetStrokeColor(cw)
	dw.SetStrokeWidth(25)
	dw.SetStrokeAntialias(true)
	cw.SetColor("none")

	//dw.SetStrokeOpacity(1)
	dw.SetFillColor(cw)
	log.Println("drawing circle on image")
	dw.Circle(200,200,275,50)




	cw.SetColor("white")

	dw.SetStrokeColor(cw)
	dw.SetStrokeWidth(120)
	dw.SetStrokeAntialias(true)
	cw.SetColor("none")

	//dw.SetStrokeOpacity(1)
	dw.SetFillColor(cw)

	dw.Circle(200,200,380,50)


	err = mw.DrawImage(dw)
	if err != nil {
		log.Println("failed to draw image")
		return []byte{}, err
	}
	newImage := mw.GetImageBlob()
	return newImage, nil
}