Add CORS to Nginx on AWS Elastic Beanstalk

01_add_cors.config.yaml

# This doesn't quite work, and neither do any of the others I found.
# At EB deploy time, it generates the config found in /tmp/passenger-standalone* from a template
#
container_commands:
  01_fix_static_cors:
    command: "/tmp/fix_static_cors.sh"
files:
  "/tmp/fix_static_cors.sh":
    mode: "000755"
    owner: root
    group: root
    content: |
      #!/bin/bash -ex
      support_dir=$(/opt/elasticbeanstalk/bin/get-config container -k support_dir)
      echo "Adding CORS Config"
      proxy_template_a="$support_dir/conf/nginx_config.erb"
      proxy_template_b="$support_dir/conf/nginx_config_healthd.erb"
      grep Access-Control-Allow $proxy_template_a || sed -i '/location @static_asset {/a \ \ \ \ \ \ \ \ \ \ \ \ add_header 'Access-Control-Allow-Origin' '*';' $proxy_template_a
      grep Access-Control-Allow $proxy_template_b || sed -i '/location @static_asset {/a \ \ \ \ \ \ \ \ \ \ \ \ add_header 'Access-Control-Allow-Origin' '*';' $proxy_template_b