[extractor/common] add update_url_params helper method to add or update query string params

1 files changed, 7 insertions, 0 deletions

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 402f2f436..282559597 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -517,6 +517,13 @@ class InfoExtractor(object):
             else:
                 self.report_warning(errmsg + str(ve))
 
+    def update_url_params(self, url, params):
+        parsed_url = compat_urlparse.urlparse(url)
+        qs = compat_urlparse.parse_qs(parsed_url.query)
+        qs.update(params)
+        return compat_urlparse.urlunparse(
+            parsed_url._replace(query=compat_urllib_parse.urlencode(qs, True)))
+
     def report_warning(self, msg, video_id=None):
         idstr = '' if video_id is None else '%s: ' % video_id
         self._downloader.report_warning(