1 files changed, 92 insertions, 0 deletions
diff --git a/mediagoblin/db/mixin.py b/mediagoblin/db/mixin.py
new file mode 100644
index 00000000..5145289e
--- /dev/null
+++ b/mediagoblin/db/mixin.py
@@ -0,0 +1,92 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011,2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+This module contains some Mixin classes for the db objects.
+
+A bunch of functions on the db objects are really more like
+"utility functions": They could live outside the classes
+and be called "by hand" passing the appropiate reference.
+They usually only use the public API of the object and
+rarely use database related stuff.
+
+These functions now live here and get "mixed in" into the
+real objects.
+"""
+
+from mediagoblin.auth import lib as auth_lib
+from mediagoblin.tools import common
+
+
+class UserMixin(object):
+    def check_login(self, password):
+        """
+        See if a user can login with this password
+        """
+        return auth_lib.bcrypt_check_password(
+            password, self.pw_hash)
+
+
+class MediaEntryMixin(object):
+    def get_display_media(self, media_map,
+                          fetch_order=common.DISPLAY_IMAGE_FETCHING_ORDER):
+        """
+        Find the best media for display.
+
+        Args:
+        - media_map: a dict like
+          {u'image_size': [u'dir1', u'dir2', u'image.jpg']}
+        - fetch_order: the order we should try fetching images in
+
+        Returns:
+        (media_size, media_path)
+        """
+        media_sizes = media_map.keys()
+
+        for media_size in common.DISPLAY_IMAGE_FETCHING_ORDER:
+            if media_size in media_sizes:
+                return media_map[media_size]
+
+    def main_mediafile(self):
+        pass
+
+    def url_for_self(self, urlgen, **extra_args):
+        """
+        Generate an appropriate url for ourselves
+
+        Use a slug if we have one, else use our '_id'.
+        """
+        uploader = self.get_uploader
+
+        if self.get('slug'):
+            return urlgen(
+                'mediagoblin.user_pages.media_home',
+                user=uploader.username,
+                media=self.slug,
+                **extra_args)
+        else:
+            return urlgen(
+                'mediagoblin.user_pages.media_home',
+                user=uploader.username,
+                media=unicode(self._id),
+                **extra_args)
+
+    def get_fail_exception(self):
+        """
+        Get the exception that's appropriate for this error
+        """
+        if self['fail_error']:
+            return common.import_component(self['fail_error'])