Simple image renderer with Go.

image.go

package main

import (
	"bytes"
	"github.com/quirkey/magick"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"path/filepath"
	"time"
)

func imageHandler(w http.ResponseWriter, req *http.Request) {
	uri := req.FormValue("u")
	log.Printf("Requesting image: %s", uri)
	response, err := http.Get(uri)
	if err != nil {
		log.Fatal(err)
	}
	defer response.Body.Close()
	body, err := ioutil.ReadAll(response.Body)
	if err != nil {
		log.Fatal(err)
	}
	u, err := url.Parse(uri)
	if err != nil {
		log.Fatal(err)
	}
	ext := filepath.Ext(u.Path)
	log.Printf("Treating image: %s as %s", uri, ext)
	image, err := magick.NewFromBlob(body, ext)
	defer image.Destroy()
	if err != nil {
		log.Fatal(err)
	}
	err = image.Resize("400x200")
	slice, err := image.ToBlob("jpg")
	http.ServeContent(w, req, filepath.Base(u.Path), time.Now(), bytes.NewReader(slice))
}

func main() {
	http.HandleFunc("/image", imageHandler)
	print("listening")
	http.ListenAndServe(":4001", nil)
}