Make sure we don't raise on 412.

kinto/tests/test_default_bucket.py

@@ -43,3 +43,11 @@ def test_bucket_id_is_an_uuid(self):
             uuid.UUID(bucket_id)
         except ValueError:
             self.fail('bucket_id: %s is not a valid UUID.' % bucket_id)
+
+    def test_second_call_on_default_bucket_doesnt_raise_a_412(self):
+        self.app.get(self.bucket_url, headers=self.headers)
+        self.app.get(self.bucket_url, headers=self.headers)
+
+    def test_second_call_on_default_bucket_collection_doesnt_raise_a_412(self):
+        self.app.get(self.collection_url, headers=self.headers)
+        self.app.get(self.collection_url, headers=self.headers)

kinto/views/buckets.py

@@ -1,4 +1,4 @@
-from pyramid.httpexceptions import HTTPForbidden
+from pyramid.httpexceptions import HTTPForbidden, HTTPPreconditionFailed
 from pyramid.security import NO_PERMISSION_REQUIRED
 from pyramid.view import view_config
 
@@ -21,27 +21,38 @@ def default_bucket(request):
     path = request.path.replace('default', bucket_id)
 
     # Make sure bucket exists
-    # XXX: Is there a better way to do a GET or CREATE?
-    subrequest = build_request(request, {
-        'method': 'PUT',
-        'path': '/buckets/%s' % bucket_id,
-        'body': {"data": {}},
-        'headers': {'If-None-Match': '*'}
-    })
-    request.invoke_subrequest(subrequest)
-
-    # Make sure the collection exists
-    subpath = request.matchdict['subpath']
-    if subpath.startswith('/collections/'):
-        # XXX: Is there a better way to do a GET or CREATE?
-        collection_id = subpath.split('/')[2]
+    if request.method.lower() != 'put' or \
+       not request.path.endswith('buckets/default'):
         subrequest = build_request(request, {
             'method': 'PUT',
-            'path': '/buckets/%s/collections/%s' % (bucket_id, collection_id),
+            'path': '/buckets/%s' % bucket_id,
             'body': {"data": {}},
             'headers': {'If-None-Match': '*'}
         })
-        request.invoke_subrequest(subrequest)
+        try:
+            request.invoke_subrequest(subrequest)
+        except HTTPPreconditionFailed:
+            # The bucket already existed
+            pass
+
+    # Make sure the collection exists
+    subpath = request.matchdict['subpath']
+    if subpath.startswith('/collections/'):
+        collection_id = subpath.split('/')[2]
+        if request.method.lower() != 'put' or \
+           not request.path.endswith(collection_id):
+            subrequest = build_request(request, {
+                'method': 'PUT',
+                'path': '/buckets/%s/collections/%s' % (
+                    bucket_id, collection_id),
+                'body': {"data": {}},
+                'headers': {'If-None-Match': '*'}
+            })
+            try:
+                request.invoke_subrequest(subrequest)
+            except HTTPPreconditionFailed:
+                # The bucket already existed
+                pass
 
     subrequest = build_request(request, {
         'method': request.method,