Decommission ActiveStorage proxy service and use openstack service

We are making these changes in order to always use DS_Proxy. Before this change DS_Proxy was not used to write files when ActiveStorage was used directly and not through “direct upload”.

config/initializers/active_storage.rb

@@ -7,3 +7,33 @@ ActiveStorage::Service.url_expires_in = 1.hour
 # cleaner (as it allows to enqueue the virus scan on attachment creation, rather
 # than on blob creation).
 ActiveSupport.on_load(:active_storage_blob) { include BlobVirusScanner }
+
+# When an OpenStack service is initialized it makes a request to fetch
+# `publicURL` to use for all operations. We intercept the method that reads
+# this url and replace the host with DS_Proxy host. This way all the operation
+# are performed through DS_Proxy.
+#
+# https://github.com/fog/fog-openstack/blob/37621bb1d5ca78d037b3c56bd307f93bba022ae1/lib/fog/openstack/auth/catalog/v2.rb#L16
+require 'fog/openstack/auth/catalog/v2'
+
+module Fog::OpenStack::Auth::Catalog
+  class V2
+    def endpoint_url(endpoint, interface)
+      url = endpoint["#{interface}URL"]
+
+      if interface == 'public'
+        publicize(url)
+      else
+        url
+      end
+    end
+
+    private
+
+    def publicize(url)
+      search = %r{^https://[^/]+/}
+      replace = 'https://static.demarches-simplifiees.fr/'
+      url.gsub(search, replace)
+    end
+  end
+end