Upgrade Rails to version 5.2.0 (#5898)

config/initializers/content_security_policy.rb

@@ -0,0 +1,20 @@
+# Define an application-wide content security policy
+# For further information see the following documentation
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+
+# Rails.application.config.content_security_policy do |p|
+#   p.default_src :self, :https
+#   p.font_src    :self, :https, :data
+#   p.img_src     :self, :https, :data
+#   p.object_src  :none
+#   p.script_src  :self, :https
+#   p.style_src   :self, :https, :unsafe_inline
+#
+#   # Specify URI for violation reports
+#   # p.report_uri "/csp-violation-report-endpoint"
+# end
+
+# Report CSP violations to a specified URI
+# For further information see the following documentation:
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
+# Rails.application.config.content_security_policy_report_only = true

config/initializers/cors.rb

@@ -0,0 +1,26 @@
+# Be sure to restart your server when you modify this file.
+
+# Avoid CORS issues when API is called from the frontend app.
+# Handle Cross-Origin Resource Sharing (CORS) in order to accept cross-origin AJAX requests.
+
+# Read more: https://github.com/cyu/rack-cors
+
+Rails.application.config.middleware.insert_before 0, Rack::Cors do
+  allow do
+    origins '*'
+
+    resource '/@:username',
+      headers: :any,
+      methods: [:get],
+      credentials: false
+    resource '/api/*',
+      headers: :any,
+      methods: [:post, :put, :delete, :get, :patch, :options],
+      credentials: false,
+      expose: ['Link', 'X-RateLimit-Reset', 'X-RateLimit-Limit', 'X-RateLimit-Remaining', 'X-Request-Id']
+    resource '/oauth/token',
+      headers: :any,
+      methods: [:post],
+      credentials: false
+  end
+end