matrix-docker-ansible-deploy/roles/custom/matrix-etherpad/tasks/init.yml

---

- when: matrix_etherpad_enabled | bool and matrix_etherpad_mode == 'dimension'
  tags:
    - always
  block:
    - 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:
        matrix_etherpad_matrix_nginx_proxy_configuration: |
          rewrite ^{{ matrix_etherpad_public_endpoint }}$ {{ matrix_nginx_proxy_x_forwarded_proto_value }}://$server_name{{ matrix_etherpad_public_endpoint }}/ permanent;

          location {{ matrix_etherpad_public_endpoint }}/ {
          {% 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://matrix-etherpad: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([])
            +
            [matrix_etherpad_matrix_nginx_proxy_configuration]
          }}