matrix-docker-ansible-deploy/roles/custom/etherpad-proxy-connect/tasks/inject_into_nginx_proxy.yml

---

- name: Fail if matrix-nginx-proxy role already executed
  ansible.builtin.fail:
    msg: >-
      Trying to append Etherpad's reverse-proxying configuration to matrix-nginx-proxy,
      but it's pointless since the matrix-nginx-proxy role had already executed.
      To fix this, please change the order of roles in your playbook,
      so that the matrix-nginx-proxy role would run after the matrix-etherpad role.
  when: matrix_nginx_proxy_role_executed | default(False) | bool

- name: Generate Etherpad proxying configuration for matrix-nginx-proxy
  ansible.builtin.set_fact:
    etherpad_matrix_nginx_proxy_configuration: |
      rewrite ^{{ etherpad_nginx_proxy_dimension_integration_path_prefix }}$ {{ matrix_nginx_proxy_x_forwarded_proto_value }}://$server_name{{ etherpad_nginx_proxy_dimension_integration_path_prefix }}/ permanent;

      location {{ etherpad_nginx_proxy_dimension_integration_path_prefix }}/ {
      {% if matrix_nginx_proxy_enabled | default(False) %}
        {# Use the embedded DNS resolver in Docker containers to discover the service #}
        resolver 127.0.0.11 valid=5s;
        proxy_pass http://{{ etherpad_identifier }}:9001/;
        {# These are proxy directives needed specifically by Etherpad #}
        proxy_buffering off;
        proxy_http_version 1.1;  # recommended with keepalive connections
        proxy_pass_header Server;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto {{ matrix_nginx_proxy_x_forwarded_proto_value }}; # for EP to set secure cookie flag when https is used
        # WebSocket proxying - from http://nginx.org/en/docs/http/websocket.html
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
      {% else %}
        {# Generic configuration for use outside of our container setup #}
        # A good guide for setting up your Etherpad behind nginx:
        # https://docs.gandi.net/en/cloud/tutorials/etherpad_lite.html
        proxy_pass http://127.0.0.1:9001/;
      {% endif %}
      }

- name: Register Etherpad proxying configuration with matrix-nginx-proxy
  ansible.builtin.set_fact:
    matrix_nginx_proxy_proxy_dimension_additional_server_configuration_blocks: |
      {{
        matrix_nginx_proxy_proxy_dimension_additional_server_configuration_blocks | default([])
        +
        [etherpad_matrix_nginx_proxy_configuration]
      }}