[grilo-plugins] guardianvideos: Fix parsing of metadata

[Victor Toso <victortoso src gnome org>]

commit d9df3871d45a23b87dfe39ecc1c03661f0115f41
Author: veer <bveer428 gmail com>
Date:   Mon Jun 4 02:01:20 2018 +0530

    guardianvideos: Fix parsing of metadata
    
    Closes #2
    Signed-off-by: Victor Toso <victortoso redhat com>

 src/lua-factory/sources/grl-guardianvideos.lua | 27 ++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)
---
diff --git a/src/lua-factory/sources/grl-guardianvideos.lua b/src/lua-factory/sources/grl-guardianvideos.lua
index 9db333f..ca9ded2 100644
--- a/src/lua-factory/sources/grl-guardianvideos.lua
+++ b/src/lua-factory/sources/grl-guardianvideos.lua
@@ -105,9 +105,32 @@ function create_media(item)
 
   media.type = "video"
   media.id = item.id
-  media.url = item.webUrl
   media.title = grl.unescape(item.webTitle)
-  media.thumbnail = item.fields.thumbnail
+
+  main = item.fields.main
+  -- Some entries rarely don't have a 'main' field. So, we bail out.
+  if not main then
+    grl.warning ("No media URL metadata found for: " .. media.title)
+    return media
+  end
+
+  media.url = main:match('src="(.-%.mp4)"')
+  media.thumbnail = main:match('poster="(.-%.jpg)"')
+
+  if not media.url then
+    grl.warning ("No media streaming URL found for: " .. media.title)
+    grl.debug ("Data from: " .. media.title .. "\n" .. grl.lua.inspect(item));
+  end
+
+  if not media.thumbnail then
+    -- Try to see if we have a 'thumbnail' field. This field seems
+    -- to exist for some entries, which don't have a 'poster' field
+    if item.fields.thumbnail then
+      media.thumbnail = item.fields.thumbnail
+    else
+      grl.debug ("No media thumbnail URL found for: " .. media.title)
+    end
+  end
 
   return media
 end