From 88c978bdca70d6e20f27ff515a6b673bef4a3c4c Mon Sep 17 00:00:00 2001
From: Thomas Adamcik <thomas@adamcik.no>
Date: Wed, 18 Feb 2015 21:13:25 +0100
Subject: [PATCH] backend: Add a default get_images impl.

---
 mopidy/backend.py | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mopidy/backend.py b/mopidy/backend.py
index 3dc3a28c..70591b3e 100644
--- a/mopidy/backend.py
+++ b/mopidy/backend.py
@@ -2,7 +2,7 @@ from __future__ import absolute_import, unicode_literals
 
 import copy
 
-from mopidy import listener
+from mopidy import listener, models
 
 
 class Backend(object):
@@ -97,8 +97,19 @@ class LibraryProvider(object):
         See :meth:`mopidy.core.LibraryController.get_images`.
 
         *MAY be implemented by subclass.*
+
+        Default implementation will simply call lookup and try and use the
+        album art for any tracks returned. Most extensions should replace this
+        with something smarter or simply return an empty dictionary.
         """
-        return {}
+        result = {}
+        for uri in uris:
+            for track in self.lookup(uri):
+                if track.album and track.album.images:
+                    for image_uri in track.album.images:
+                        image = models.Image(uri=image_uri)
+                        result.setdefault(uri, []).append(image)
+        return result
 
     # TODO: replace with search(query, exact=True, ...)
     def find_exact(self, query=None, uris=None):