misc: remove metadata cache as django-mellon has that now (#88579)

src/authentic2_auth_fedict/adapters.py

@@ -15,20 +15,14 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import datetime
-import hashlib
 import logging
-import os
-import time
 
 import lasso
-import mellon.utils as mellon_utils
 import requests
 from authentic2.a2_rbac.utils import get_default_ou
 from authentic2.models import Attribute
 from django.conf import settings
-from django.core.files.storage import default_storage
-from django.utils.encoding import force_bytes, force_text
-from mellon.adapters import DefaultAdapter, app_settings
+from mellon.adapters import DefaultAdapter
 
 try:
     import authentic2.utils.misc as a2_utils_misc
@@ -54,36 +48,6 @@ class AuthenticAdapter(DefaultAdapter):
     def auth_login(self, request, user):
         a2_utils_misc.login(request, user, 'fedict')
 
-    def get_identity_providers_setting(self):
-        providers = app_settings.IDENTITY_PROVIDERS
-        cache_path = default_storage.path('fedict-cache')
-        if not os.path.exists(cache_path):
-            os.makedirs(cache_path)
-        for idp in providers:
-            if 'METADATA_URL' in idp and 'METADATA' not in idp:
-                url_hash = hashlib.sha1(force_bytes(idp['METADATA_URL'])).hexdigest()
-                metadata_cache_filename = os.path.join(cache_path, url_hash)
-                if os.path.exists(metadata_cache_filename):
-                    stat_info = os.stat(metadata_cache_filename)
-                    if stat_info.st_size and stat_info.st_mtime > (time.time() - 86400):
-                        with open(metadata_cache_filename) as fd:
-                            idp['METADATA'] = force_text(fd.read())
-                        continue
-                verify_ssl_certificate = mellon_utils.get_setting(idp, 'VERIFY_SSL_CERTIFICATE')
-                try:
-                    response = requests.get(idp['METADATA_URL'], verify=verify_ssl_certificate, timeout=30)
-                    response.raise_for_status()
-                except requests.exceptions.RequestException:
-                    if os.path.exists(metadata_cache_filename):
-                        # accept older cache in case of error
-                        with open(metadata_cache_filename) as fd:
-                            idp['METADATA'] = force_text(fd.read())
-                    continue
-                idp['METADATA'] = response.text
-                with open(metadata_cache_filename, 'wb') as fd:
-                    fd.write(response.content)
-        return providers
-
     def lookup_user(self, idp, saml_attributes):
         if 'email' in saml_attributes:
             # XXX: remove email from received attributes for now, this