utils.go

package facebot

import (
	"image"
	"image/jpeg"
	_ "image/png"
	"net/http"
	"os"
)

func writeImage(filename string, img image.Image) error {
	f, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer f.Close()
	return jpeg.Encode(f, img, &jpeg.Options{jpeg.DefaultQuality})
}

func fetchImage(url string) (image.Image, error) {
	resp, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	img, _, err := image.Decode(resp.Body)
	if err != nil {
		return nil, err
	}
	return img, nil
}