middleware for printing private layers

geonode/middleware.py

+from django.conf import settings
+from django.utils import simplejson as json
+
+from geonode.security.enumerations import AUTHENTICATED_USERS, ANONYMOUS_USERS
+
+class PrintProxyMiddleware(object):
+    def process_request(self, request):
+        if request.method == 'POST':
+            if request.GET.has_key('url') and 'pdf' in request.GET['url']:
+                print_map(request)
+
+def print_map(request):
+    from django.conf import settings
+    from proxy.views import proxy
+    from layers.models import Layer
+
+    permissions = {}
+    params = json.loads(request.body)
+    for layer in params['layers']:
+        if settings.GEOSERVER_BASE_URL in layer['baseURL']:
+            for layer_name in layer['layers']:
+                layer_obj = Layer.objects.get(typename=layer_name)
+                permissions[layer_obj] = {}
+                permissions[layer_obj]['anonymous'] = layer_obj.get_gen_level(ANONYMOUS_USERS)
+                permissions[layer_obj]['authenticated'] = layer_obj.get_gen_level(AUTHENTICATED_USERS)
+                layer_obj.set_gen_level(ANONYMOUS_USERS,'layer_readonly')
+    try:
+        resp =  proxy(request)
+    except Exception, e:
+        return HttpResponse('There was an error connecting to the printing server')
+    finally:
+        for layer_obj in permissions.keys():
+            perm_spec = permissions[layer_obj]
+            layer_obj.set_gen_level(ANONYMOUS_USERS,perm_spec['anonymous'])
+            layer_obj.set_gen_level(AUTHENTICATED_USERS,perm_spec['authenticated'])
+
+    return resp

geonode/settings.py

@@ -278,6 +278,10 @@ MIDDLEWARE_CLASSES = (
     'pagination.middleware.PaginationMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
+    # This middleware allows to print private layers.
+    # It sets temporarly the involved layers as public before restoring the permission
+    # Beware of possible risks when activating this
+    #'geonode.middleware.PrintProxyMiddleware',
 )