use extractor.request for API calls (#130)

... at least for OAuth1.0 based APIs (flickr, smugmug, tumblr)

gallery_dl/extractor/common.py

@@ -54,16 +54,17 @@ class Extractor():
         return config.interpolate(
             ("extractor", self.category, self.subcategory, key), default)
 
-    def request(self, url, method="GET", *,
+    def request(self, url, method="GET", *, session=None,
                 encoding=None, expect=(), retries=None, **kwargs):
         tries = 0
         retries = retries or self._retries
+        session = session or self.session
         kwargs.setdefault("timeout", self._timeout)
         kwargs.setdefault("verify", self._verify)
 
         while True:
             try:
-                response = self.session.request(method, url, **kwargs)
+                response = session.request(method, url, **kwargs)
             except (requests.exceptions.ConnectionError,
                     requests.exceptions.Timeout,
                     requests.exceptions.ChunkedEncodingError,

gallery_dl/extractor/flickr.py

@@ -295,7 +295,6 @@ class FlickrAPI(oauth.OAuth1API):
         else:
             self.formats = self.FORMATS
         self.formats = self.formats[:4]
-        self.subcategory = extractor.subcategory
 
     def favorites_getList(self, user_id):
         """Returns a list of the user's favorite photos."""
@@ -387,10 +386,10 @@ class FlickrAPI(oauth.OAuth1API):
         params["nojsoncallback"] = "1"
         if self.api_key:
             params["api_key"] = self.api_key
-        data = self.session.get(self.API_URL, params=params).json()
+        data = self.request(self.API_URL, params=params).json()
         if "code" in data:
             if data["code"] == 1:
-                raise exception.NotFoundError(self.subcategory)
+                raise exception.NotFoundError(self.extractor.subcategory)
             elif data["code"] == 98:
                 raise exception.AuthenticationError(data.get("message"))
             elif data["code"] == 99:

gallery_dl/extractor/smugmug.py

@@ -238,7 +238,7 @@ class SmugmugAPI(oauth.OAuth1API):
             params["APIKey"] = self.api_key
         params["_verbosity"] = "1"
 
-        response = self.session.get(url, params=params, headers=self.HEADERS)
+        response = self.request(url, params=params, headers=self.HEADERS)
         data = response.json()
 
         if 200 <= data["Code"] < 400:

gallery_dl/extractor/tumblr.py

@@ -303,7 +303,7 @@ class TumblrAPI(oauth.OAuth1API):
         url = "https://api.tumblr.com/v2/blog/{}/{}".format(
             blog, endpoint)
 
-        response = self.session.get(url, params=params)
+        response = self.request(url, params=params)
         data = response.json()
         status = data["meta"]["status"]