Added MAL avatar source

jobs/avatars/Gravatar.go

@@ -1,17 +1,18 @@
 package main
 
 import (
-	"bytes"
 	"fmt"
-	"image"
+	"time"
 
 	"github.com/animenotifier/arn"
-	"github.com/parnurzeal/gorequest"
 	gravatar "github.com/ungerik/go-gravatar"
 )
 
 // Gravatar - https://gravatar.com/
-type Gravatar struct{}
+type Gravatar struct {
+	Rating         string
+	RequestLimiter *time.Ticker
+}
 
 // GetAvatar returns the Gravatar image for a user (if available).
 func (source *Gravatar) GetAvatar(user *arn.User) *Avatar {
@@ -21,26 +22,11 @@ func (source *Gravatar) GetAvatar(user *arn.User) *Avatar {
 	}
 
 	// Build URL
-	gravatarURL := gravatar.Url(user.Email) + "?s=" + fmt.Sprint(arn.AvatarMaxSize) + "&d=404&r=pg"
+	gravatarURL := gravatar.Url(user.Email) + "?s=" + fmt.Sprint(arn.AvatarMaxSize) + "&d=404&r=" + source.Rating
+
+	// Wait for request limiter to allow us to send a request
+	<-source.RequestLimiter.C
 
 	// Download
-	response, data, networkErr := gorequest.New().Get(gravatarURL).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,
-	}
+	return AvatarFromURL(gravatarURL, user)
 }