[grilo-plugins] lua-factory: Add Spotify cover source



commit 03ee61462992a25bebab496ad356af5154d67b27
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Sep 10 11:57:17 2015 +0200

    lua-factory: Add Spotify cover source
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754811

 src/lua-factory/sources/Makefile.am           |    1 +
 src/lua-factory/sources/grl-spotify-cover.lua |   99 +++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 0 deletions(-)
---
diff --git a/src/lua-factory/sources/Makefile.am b/src/lua-factory/sources/Makefile.am
index 325842c..a762df1 100644
--- a/src/lua-factory/sources/Makefile.am
+++ b/src/lua-factory/sources/Makefile.am
@@ -9,6 +9,7 @@ include $(top_srcdir)/gtester.mk
 
 lua_sources_DATA =                                     \
        grl-metrolyrics.lua                             \
+       grl-spotify-cover.lua                           \
        grl-radiofrance.lua                             \
        grl-euronews.lua                                \
        grl-guardianvideos.lua                          \
diff --git a/src/lua-factory/sources/grl-spotify-cover.lua b/src/lua-factory/sources/grl-spotify-cover.lua
new file mode 100644
index 0000000..1f7ad1c
--- /dev/null
+++ b/src/lua-factory/sources/grl-spotify-cover.lua
@@ -0,0 +1,99 @@
+--[[
+ * Copyright (C) 2015 Bastien Nocera.
+ *
+ * Contact: Bastien Nocera <hadess hadess net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+--]]
+
+---------------------------
+-- Source initialization --
+---------------------------
+
+source = {
+  id = "grl-spotify-cover",
+  name = "Spotify Cover",
+  description = "a source for music covers",
+  supported_keys = { 'thumbnail' },
+  supported_media = { 'audio' },
+  resolve_keys = {
+    ["type"] = "audio",
+    required = { "artist", "album" },
+  },
+  tags = { 'music', 'net:internet' },
+}
+
+------------------
+-- Source utils --
+------------------
+
+SPOTIFY_SEARCH_ALBUM = 'https://api.spotify.com/v1/search?q=album:%s+artist:%s&type=album&limit=1'
+
+---------------------------------
+-- Handlers of Grilo functions --
+---------------------------------
+
+function grl_source_resolve()
+  local url, req
+  local artist, title
+
+  req = grl.get_media_keys()
+  if not req or not req.artist or not req.album
+    or #req.artist == 0 or #req.album == 0 then
+    grl.callback()
+    return
+  end
+
+  -- Prepare artist and title strings to the url
+  artist = grl.encode(req.artist)
+  album = grl.encode(req.album)
+  url = string.format(SPOTIFY_SEARCH_ALBUM, album, artist)
+
+  grl.fetch(url, "fetch_page_cb")
+end
+
+---------------
+-- Utilities --
+---------------
+
+function fetch_page_cb(result)
+  local json = {}
+
+  if not result then
+    grl.callback()
+    return
+  end
+
+  json = grl.lua.json.string_to_table(result)
+  if not json or
+     not json.albums or
+     json.albums.total == 0 or
+     not json.albums.items or
+     not #json.albums.items or
+     not json.albums.items[1].images then
+    grl.callback()
+    return
+  end
+
+  local media = {}
+  media.thumbnail = {}
+  for i, item in ipairs(json.albums.items[1].images) do
+    table.insert(media.thumbnail, item.url)
+  end
+
+  grl.callback(media, 0)
+end


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