[grilo-plugins] youtube: get video url from the url mappings available in the video info page.

[Iago Toral Quiroga <itoral src gnome org>]

commit 45cdc50010308d698cbf3e0dadbb793cf701e8d4
Author: Iago Toral Quiroga <itoral igalia com>
Date:   Tue Aug 3 11:56:34 2010 +0200

    youtube: get video url from the url mappings available in the video
    info page.
    
    Right now we provide the URL of the first format available but in the
    future we should be able to provide multiple URLs or provide means
    for the client to configure preferred formats.

 src/youtube/grl-youtube.c |   73 +++++++++++++++++++++++++++++++++++----------
 1 files changed, 57 insertions(+), 16 deletions(-)
---
diff --git a/src/youtube/grl-youtube.c b/src/youtube/grl-youtube.c
index 6763e76..826a088 100644
--- a/src/youtube/grl-youtube.c
+++ b/src/youtube/grl-youtube.c
@@ -385,34 +385,75 @@ read_url_async (const gchar *url,
 static gchar *
 get_video_url (const gchar *id)
 {
-  gchar *token_start;
-  gchar *token_end;
-  gchar *token;
   gchar *video_info_url;
   gchar *data;
-  gchar *url;
+  GMatchInfo *match_info;
+  gchar *url = NULL;
+  static GRegex *regex = NULL;
+
+  /* The procedure to get the video url is:
+   * 1) Get the video info URL using the video id
+   * 2) In the video info page, there should be an array of supported formats
+   *    and their corresponding URLs, right now we just use the first one we get.
+   *    TODO: we should be able to provide various urls or at least
+   *          select preferred formats via configuration
+   * 3) As a workaround in case no format array is found we get the video token
+   *    and figure out the url of the video using the video id and the token.
+   */
 
   video_info_url = g_strdup_printf (YOUTUBE_VIDEO_INFO_URL, id);
   data = read_url (video_info_url);
   if (!data) {
-    g_free (video_info_url);
-    return NULL;
+    goto done;
   }
 
-  token_start = g_strrstr (data, "&token=");
-  if (!token_start) {
-    g_free (video_info_url);
-    return NULL;
+  if (regex == NULL) {
+    regex = g_regex_new (".*&fmt_url_map=([^&]+)&", G_REGEX_OPTIMIZE, 0, NULL);
   }
-  token_start += 7;
-  token_end = strstr (token_start, "&");
-  token = g_strndup (token_start, token_end - token_start);
 
-  url = g_strdup_printf (YOUTUBE_VIDEO_URL, id, token);
+  /* Check if we find the url mapping */
+  g_regex_match (regex, data, 0, &match_info);
+  if (g_match_info_matches (match_info) == TRUE) {
+    gchar *url_map_escaped, *url_map;
+    gchar **mappings, **i;
+
+    url_map_escaped = g_match_info_fetch (match_info, 1);
+    url_map = g_uri_unescape_string (url_map_escaped, NULL);
+    g_free (url_map_escaped);
+
+    mappings = g_strsplit (url_map, ",", 0);
+    g_free (url_map);
+
+    if (mappings != NULL) {
+      /* TODO: We get the URL from the first format available.
+       * We should provide the list of available urls or let the user
+       * configure preferred formats
+       */
+      gchar **mapping = g_strsplit (mappings[0], "|", 2);
+      url = g_strdup (mapping[1]);
+      g_strfreev (mapping);
+    }
+  } else {
+    g_debug ("Format array not found, using token workaround");
+    gchar *token_start;
+    gchar *token_end;
+    gchar *token;
+    token_start = g_strrstr (data, "&token=");
+    if (!token_start) {
+      goto done;
+    }
+    token_start += 7;
+    token_end = strstr (token_start, "&");
+    token = g_strndup (token_start, token_end - token_start);
+
+    url = g_strdup_printf (YOUTUBE_VIDEO_URL, id, token);
+    g_free (token);
+  }
 
+ done:
   g_free (video_info_url);
-  g_free (token);
-
+  g_free (data);
+  
   return url;
 }