Commit 22d1f305 authored by santiaago's avatar santiaago
Browse files

first take and image generation

parent 334c773a

app-backend/main.go

+49 −3
Original line number Diff line number Diff line 
package main



import (

	"bytes"

	"flag"

	"fmt"

	"image"

	"image/color"

	"image/draw"

	"image/jpeg"

	"log"

	"net/http"

	"os"

	"strconv"

)



var root = flag.String("root", "app", "file system path")
@@ -13,6 +18,7 @@ var root = flag.String("root", "app", "file system path") 
func main() {

	http.HandleFunc("/black/", blackHandler)

	http.HandleFunc("/green/", greenHandler)

	http.HandleFunc("/blue/", blueHandler)

	http.Handle("/", http.FileServer(http.Dir(*root)))

	log.Println("Listening on " + os.Getenv("PORT"))

	err := http.ListenAndServe(":"+os.Getenv("PORT"), nil)
@@ -22,9 +28,49 @@ func main() { 
}



func blackHandler(w http.ResponseWriter, r *http.Request) {

	fmt.Fprintf(w, "black handler!")

	// prepare

	m := image.NewRGBA(image.Rect(0, 0, 240, 240))

	blue := color.RGBA{0, 0, 0, 255}

	draw.Draw(m, m.Bounds(), &image.Uniform{blue}, image.ZP, draw.Src)



	// encode

	buf := new(bytes.Buffer)

	_ = jpeg.Encode(buf, m, nil)



	// write

	w.Header().Set("Content-Type", "image/jpeg")

	w.Header().Set("Content-Length", strconv.Itoa(len(buf.Bytes())))

	w.Write(buf.Bytes())

}



func greenHandler(w http.ResponseWriter, r *http.Request) {

	fmt.Fprintf(w, "green handler!")

	// prepare

	m := image.NewRGBA(image.Rect(0, 0, 240, 240))

	blue := color.RGBA{0, 128, 0, 255}

	draw.Draw(m, m.Bounds(), &image.Uniform{blue}, image.ZP, draw.Src)



	// encode

	buf := new(bytes.Buffer)

	_ = jpeg.Encode(buf, m, nil)



	// write

	w.Header().Set("Content-Type", "image/jpeg")

	w.Header().Set("Content-Length", strconv.Itoa(len(buf.Bytes())))

	w.Write(buf.Bytes())

}



func blueHandler(w http.ResponseWriter, r *http.Request) {

	// prepare

	m := image.NewRGBA(image.Rect(0, 0, 240, 240))

	blue := color.RGBA{0, 0, 255, 255}

	draw.Draw(m, m.Bounds(), &image.Uniform{blue}, image.ZP, draw.Src)



	// encode

	buf := new(bytes.Buffer)

	_ = jpeg.Encode(buf, m, nil)



	// write

	w.Header().Set("Content-Type", "image/jpeg")

	w.Header().Set("Content-Length", strconv.Itoa(len(buf.Bytes())))

	w.Write(buf.Bytes())

}