Add matrix-registration support

roles/matrix-registration/tasks/init.yml

@@ -0,0 +1,64 @@
+- set_fact:
+    matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-registration'] }}"
+  when: matrix_registration_enabled|bool
+
+- block:
+  - name: Fail if matrix-nginx-proxy role already executed
+    fail:
+      msg: >-
+        Trying to append matrix-registration'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 plabook,
+        so that the matrix-nginx-proxy role would run after the matrix-registration role.
+    when: matrix_nginx_proxy_role_executed|default(False)|bool
+
+  - name: Generate matrix-registration proxying configuration for matrix-nginx-proxy
+    set_fact:
+      matrix_registration_matrix_nginx_proxy_configuration: |
+        rewrite ^{{ matrix_registration_public_endpoint }}$ $scheme://$server_name{{ matrix_registration_public_endpoint }}/ permanent;
+        rewrite ^{{ matrix_registration_public_endpoint }}/$ $scheme://$server_name{{ matrix_registration_public_endpoint }}/register redirect;
+
+        location ~ ^{{ matrix_registration_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;
+          set $backend "matrix-registration:5000";
+          proxy_pass http://$backend/$1;
+        {% else %}
+          {# Generic configuration for use outside of our container setup #}
+          proxy_pass http://127.0.0.1:8767/$1;
+        {% endif %}
+
+          {#
+            Workaround matrix-registration serving static files at /static
+            (see https://github.com/ZerataX/matrix-registration/issues/29)
+
+            Also fixing the form, which goes to /register.
+          #}
+          sub_filter_once off;
+          sub_filter_types text/html;
+          sub_filter "/static/" "{{ matrix_registration_public_endpoint }}/static/";
+          sub_filter "/register" "{{ matrix_registration_public_endpoint }}/register";
+        }
+
+  - name: Register matrix-registration proxying configuration with matrix-nginx-proxy
+    set_fact:
+      matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks: |
+        {{
+          matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks|default([])
+          +
+          [matrix_registration_matrix_nginx_proxy_configuration]
+        }}
+  tags:
+    - always
+  when: matrix_registration_enabled|bool
+
+- name: Warn about reverse-proxying if matrix-nginx-proxy not used
+  debug:
+    msg: >-
+      NOTE: You've enabled the matrix-registration tool but are not using the matrix-nginx-proxy
+      reverse proxy.
+      Please make sure that you're proxying the `{{ matrix_registration_public_endpoint }}`
+      URL endpoint to the matrix-registration container.
+      You can expose the container's port using the `matrix_registration_container_http_host_bind_port` variable.
+  when: "matrix_registration_enabled|bool and matrix_nginx_proxy_enabled is not defined"