Added setup_user_in_request

mediagoblin/util.py

@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import jinja2
+import mongokit
 
 def get_jinja_env(user_template_path=None):
     if user_template_path:
@@ -25,3 +26,27 @@ def get_jinja_env(user_template_path=None):
         loader = jinja2.PackageLoader('mediagoblin', 'templates')
 
     return jinja2.Environment(loader=loader, autoescape=True)
+
+
+def setup_user_in_request(request):
+    """
+    Examine a request and tack on a request.user parameter if that's
+    appropriate.
+    """
+    if not request.session.has_key('user_id'):
+        return
+
+    try:
+        user = request.db.User.one({'_id': request.session['user_id']})
+        
+        if user:
+            request.user = user
+        else:
+            # Something's wrong... this user doesn't exist?  Invalidate
+            # this session.
+            request.session.invalidate()
+
+    except mongokit.MultipleResultsFound:
+        # Something's wrong... we shouldn't have multiple users with
+        # the same user id.  Invalidate this session.
+        request.session.invalidate()