[extractor] Add `_perform_login` function (#2943)

* Adds new functions `_initialize_pre_login` and `_perform_login` as part of the extractor API
* Adds `ie.supports_login` to the public API

1 files changed, 1 insertions, 7 deletions

diff --git a/yt_dlp/extractor/crunchyroll.py b/yt_dlp/extractor/crunchyroll.py
index b6ba5ef56..bf1bf8c1c 100644
--- a/yt_dlp/extractor/crunchyroll.py
+++ b/yt_dlp/extractor/crunchyroll.py
@@ -57,10 +57,7 @@ class CrunchyrollBaseIE(InfoExtractor):
                 'Content-Type': 'application/x-www-form-urlencoded',
             })
 
-    def _login(self):
-        username, password = self._get_login_info()
-        if username is None:
-            return
+    def _perform_login(self, username, password):
         if self._get_cookies(self._LOGIN_URL).get('etp_rt'):
             return
 
@@ -89,9 +86,6 @@ class CrunchyrollBaseIE(InfoExtractor):
         if not self._get_cookies(self._LOGIN_URL).get('etp_rt'):
             raise ExtractorError('Login succeeded but did not set etp_rt cookie')
 
-    def _real_initialize(self):
-        self._login()
-
     @staticmethod
     def _add_skip_wall(url):
         parsed_url = compat_urlparse.urlparse(url)