moved check for correct page values into decorator for view function

mediagoblin/decorators.py

@@ -44,3 +44,22 @@ def require_active_login(controller):
         return controller(request, *args, **kwargs)
 
     return _make_safe(new_controller_func, controller)
+
+
+def uses_pagination(controller):
+    """
+    Check request GET 'page' key for wrong values
+    """
+    def wrapper(request, *args, **kwargs):
+        try:
+            page = int(request.str_GET['page'])
+            if page < 0:
+                return exc.HTTPNotFound()
+        except ValueError:
+            return exc.HTTPNotFound()
+        except KeyError:
+            request.str_GET['page'] = 1
+
+        return controller(request, *args, **kwargs)    
+
+    return _make_safe(wrapper,controller)

mediagoblin/user_pages/views.py

@@ -21,6 +21,9 @@ import wtforms
 from mediagoblin.util import Pagination
 from pymongo import ASCENDING, DESCENDING
 
+from mediagoblin.decorators import uses_pagination
+
+@uses_pagination
 def user_home(request):
     """'Homepage' of a User()"""
     user = request.db.User.find_one({
@@ -33,12 +36,8 @@ def user_home(request):
                 .find({'uploader': user, 'state': 'processed'}) \
                .sort('created', DESCENDING)
     
-    try:
-        page = int(request.str_GET['page'])
-    except KeyError:
-        page = 1
 
-    pagination = Pagination(cursor, page)
+    pagination = Pagination( int(request.str_GET['page']), cursor)
     media_entries = pagination()
 
     #if no data is available, return NotFound

mediagoblin/util.py

@@ -29,6 +29,8 @@ from mediagoblin import globals as mgoblin_globals
 import urllib
 from math import ceil
 import copy
+import decorators
+from webob import exc
 
 TESTS_ENABLED = False
 def _activate_testing():
@@ -298,11 +300,11 @@ def setup_gettext(locale):
 class Pagination(object):
     """
     Pagination class,
-    initialization through __init__(self, page=1, per_page=2, cursor) 
+    initialization through __init__(self, cursor, page=1, per_page=2):
     get actual data slice through __call__()
     """
 
-    def __init__(self, cursor, page=1, per_page=2):
+    def __init__(self, page, cursor, per_page=2):
         """
         initializes Pagination
         -- page,       requested page