[utils] Process bytestrings in urljoin (closes #12369)

1 files changed, 6 insertions, 1 deletions

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 8738aa249..d293c7498 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1748,11 +1748,16 @@ def base_url(url):
 
 
 def urljoin(base, path):
+    if isinstance(path, bytes):
+        path = path.decode('utf-8')
     if not isinstance(path, compat_str) or not path:
         return None
     if re.match(r'^(?:https?:)?//', path):
         return path
-    if not isinstance(base, compat_str) or not re.match(r'^(?:https?:)?//', base):
+    if isinstance(base, bytes):
+        base = base.decode('utf-8')
+    if not isinstance(base, compat_str) or not re.match(
+            r'^(?:https?:)?//', base):
         return None
     return compat_urlparse.urljoin(base, path)