Added MAL avatar source

jobs/avatars/Avatar.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"bytes"
+	"fmt"
 	"image"
 
 	"github.com/animenotifier/arn"
+	"github.com/parnurzeal/gorequest"
 )
 
 // Avatar represents a single image and the name of the format.
@@ -13,3 +16,32 @@ type Avatar struct {
 	Data   []byte
 	Format string
 }
+
+// String returns a text representation of the format, width and height.
+func (avatar *Avatar) String() string {
+	return fmt.Sprint(avatar.Format, " | ", avatar.Image.Bounds().Dx(), "x", avatar.Image.Bounds().Dy())
+}
+
+// AvatarFromURL downloads and decodes the image from an URL and creates an Avatar.
+func AvatarFromURL(url string, user *arn.User) *Avatar {
+	// Download
+	response, data, networkErr := gorequest.New().Get(url).EndBytes()
+
+	if networkErr != nil || response.StatusCode != 200 {
+		return nil
+	}
+
+	// Decode
+	img, format, decodeErr := image.Decode(bytes.NewReader(data))
+
+	if decodeErr != nil {
+		return nil
+	}
+
+	return &Avatar{
+		User:   user,
+		Image:  img,
+		Data:   data,
+		Format: format,
+	}
+}