[tumblr] fix avatar URLs for non-OAuth1.0 calls (closes #193)

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Changelog
 
+## Unreleased
+
 ## 1.8.0 - 2019-03-15
 ### Added
 - Support for:

gallery_dl/extractor/tumblr.py

@@ -334,6 +334,9 @@ class TumblrAPI(oauth.OAuth1API):
 
     def avatar(self, blog, size="512"):
         """Retrieve a blog avatar"""
+        if self.api_key:
+            url_fmt = "https://api.tumblr.com/v2/blog/{}/avatar/{}?api_key={}"
+            return url_fmt.format(blog, size, self.api_key)
         params = {"size": size}
         data = self._call(blog, "avatar", params, allow_redirects=False)
         return data["avatar_url"]

gallery_dl/version.py

@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.8.0"
+__version__ = "1.8.1-dev"