Configure cors for glance for additional usability

In order to enable image uploads in horizon we need to configure several
things in glance, namely cors. This change implements default overrides
allowing the system to provide for direct image uploads through horizon
which will greatly improve our usability, especially for new users.

Change-Id: I19f4027dd30b0ba22cbb195c676802ce908d3e8f
Closes-Bug: #1747684
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>
(cherry picked from commit 01d3912)

inventory/group_vars/all/glance.yml

@@ -28,3 +28,22 @@ glance_service_internalurl: "{{ glance_service_internaluri }}"
 glance_service_adminuri: "{{ glance_service_adminuri_proto }}://{{ internal_lb_vip_address }}:{{ glance_service_port }}"
 glance_service_adminurl: "{{ glance_service_adminuri }}"
 glance_api_servers: "{{ glance_service_internaluri }}"
+
+# When running RBD or horizon image upload mode is direct allow multiple locations.
+# See https://bugs.launchpad.net/openstack-ansible/+bug/1730722 for more on the
+# this topic.
+glance_show_multiple_locations: "{{ (glance_default_store == 'rbd') or (horizon_image_upload_mode == 'direct') }}"
+
+# Define the default required cors to allow image uploads through horizon
+_cors_overrides:
+  cors:
+    # LP bug 1680062
+    allow_headers: >-
+      origin,content-md5,x-image-meta-checksum,x-storage-token,accept-encoding,
+      x-auth-token,x-identity-status,x-roles,x-service-catalog,x-user-id,
+      x-tenant-id,x-openstack-request-id
+    allowed_origin: "{{ external_lb_vip_address }}"
+    allow_methods: "GET,POST,PUT,PATCH,DELETE"
+
+# Default glance API
+glance_glance_api_conf_overrides: "{{ (glance_show_multiple_locations | bool) | ternary(_cors_overrides, {}) }}"

inventory/group_vars/all/horizon.yml

@@ -0,0 +1,16 @@
+---
+# Copyright 2017, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+horizon_image_upload_mode: direct