Make matrix-corporal configuration extensible

Fixes #70 (Github Issue).

roles/matrix-corporal/defaults/main.yml

@@ -53,3 +53,38 @@ matrix_corporal_http_api_auth_token: ""
 matrix_corporal_policy_provider_config: ""
 
 matrix_corporal_debug: false
+
+
+# Default Corporal configuration template which covers the generic use case.
+# You can customize it by controlling the various variables inside it.
+#
+# For a more advanced customization, you can extend the default (see `matrix_corporal_configuration_extension_json`)
+# or completely replace this variable with your own template.
+#
+# The side-effect of this lookup is that Ansible would even parse the JSON for us, returning a dict.
+# This is unlike what it does when looking up YAML template files (no automatic parsing there).
+matrix_corporal_configuration_default: "{{ lookup('template', 'templates/config.json.j2') }}"
+
+# Your custom JSON configuration for Corporal should go to `matrix_corporal_configuration_extension_json`.
+# This configuration extends the default starting configuration (`matrix_corporal_configuration_default`).
+#
+# You can override individual variables from the default configuration, or introduce new ones.
+#
+# If you need something more special, you can take full control by
+# completely redefining `matrix_corporal_configuration_default`.
+#
+# Example configuration extension follows:
+#
+# matrix_corporal_configuration_extension_json: |
+#  {
+#   "Matrix": {
+#     "TimeoutMilliseconds": 60000
+#   }
+#  }
+matrix_corporal_configuration_extension_json: '{}'
+
+matrix_corporal_configuration_extension: "{{ matrix_corporal_configuration_extension_json|from_json if matrix_corporal_configuration_extension_json|from_json is mapping else {} }}"
+
+# Holds the final Corporal configuration (a combination of the default and its extension).
+# You most likely don't need to touch this variable. Instead, see `matrix_corporal_configuration_default`.
+matrix_corporal_configuration: "{{ matrix_corporal_configuration_default|combine(matrix_corporal_configuration_extension, recursive=True) }}"

roles/matrix-corporal/tasks/setup_corporal.yml

@@ -26,10 +26,12 @@
   when: matrix_corporal_enabled|bool
 
 - name: Ensure Matrix Corporal config installed
-  template:
+  copy:
-    src: "{{ role_path }}/templates/config.json.j2"
+    content: "{{ matrix_corporal_configuration|to_nice_json }}"
     dest: "{{ matrix_corporal_config_dir_path }}/config.json"
     mode: 0644
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_username }}"
   when: matrix_corporal_enabled|bool
 
 - name: Ensure matrix-corporal.service installed

roles/matrix-corporal/templates/config.json.j2

@@ -1,4 +1,3 @@
-#jinja2: lstrip_blocks: "True"
 {
 	"Matrix": {
 		"HomeserverDomainName": "{{ matrix_corporal_matrix_homeserver_domain_name }}",