resource proxy to serve resources resources from the same domain

ckan/config/routing.py

@@ -217,6 +217,8 @@ def make_map():
                   action='resource_datapreview')
         m.connect('/dataset/{id}/resource/{resource_id}/pdfpreview',
                   action='resource_pdfpreview')
+        m.connect('/dataset/{id}/resource/{resource_id}/proxy',
+                  action='resource_proxy')
 
     # group
     map.redirect('/groups', '/group')

ckan/controllers/package.py

@@ -1,6 +1,7 @@
 import logging
 from urllib import urlencode
 import datetime
+import urllib2
 
 from pylons import config
 from pylons.i18n import _
@@ -1307,10 +1308,26 @@ def resource_pdfpreview(self, id, resource_id):
         try:
             c.resource = get_action('resource_show')(context,
                                                      {'id': resource_id})
+            c.resource['url'] = h.url_for(controller='package',
+                action='resource_proxy', id=id, resource_id=resource_id)
+
             c.package = get_action('package_show')(context, {'id': id})
             c.resource_json = json.dumps(c.resource)
         except NotFound:
             abort(404, _('Resource not found'))
         except NotAuthorized:
             abort(401, _('Unauthorized to read resource %s') % id)
         return render('package/resource_pdfpreview.html')
+
+    def resource_proxy(self, resource_id):
+        context = {'model': model, 'session': model.Session,
+                   'user': c.user or c.author}
+        resource = get_action('resource_show')(context,
+                                                     {'id': resource_id})
+        url = resource['url']
+
+        req = urllib2.urlopen(url)
+        response.headers = req.headers
+
+        import shutil
+        shutil.copyfileobj(req, response)