Add support for more flexible container port exposing

Fixes #171 (Github Issue).

roles/matrix-bridge-appservice-discord/defaults/main.yml

@@ -11,8 +11,10 @@ matrix_appservice_discord_base_path: "{{ matrix_base_data_path }}/appservice-dis
 matrix_appservice_discord_client_id: ''
 matrix_appservice_discord_bot_token: ''
 
-# Controls whether the Appservice Discord container exposes the Client/Server API port (tcp/9005).
-matrix_appservice_discord_container_expose_client_server_api_port: false
+# Controls whether the matrix-appservice-discord container exposes its HTTP port (tcp/9005 in the container).
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:9005"), or empty string to not expose.
+matrix_appservice_discord_container_http_host_bind_port: ''
 
 # A list of extra arguments to pass to the container
 matrix_appservice_discord_container_extra_arguments: []

roles/matrix-bridge-appservice-discord/tasks/validate_config.yml

@@ -8,3 +8,12 @@
   with_items:
     - "matrix_appservice_discord_client_id"
     - "matrix_appservice_discord_bot_token"
+
+- name: (Deprecation) Catch and report renamed appservice-discord variables
+  fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_appservice_discord_container_expose_client_server_api_port', 'new': '<superseded by matrix_appservice_discord_container_http_host_bind_port>'}

roles/matrix-bridge-appservice-discord/templates/systemd/matrix-appservice-discord.service.j2

@@ -19,8 +19,8 @@ ExecStart=/usr/bin/docker run --rm --name matrix-appservice-discord \
 			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
 			--cap-drop=ALL \
 			--network={{ matrix_docker_network }} \
-			{% if matrix_appservice_discord_container_expose_client_server_api_port %}
-			-p 127.0.0.1:9005:9005 \
+			{% if matrix_appservice_discord_container_http_host_bind_port %}
+			-p {{ matrix_appservice_discord_container_http_host_bind_port }}:9005 \
 			{% endif %}
 			-v {{ matrix_appservice_discord_base_path }}:/data \
 			{% for arg in matrix_appservice_discord_container_extra_arguments %}