Add matrix_client_hydrogen_hostname and fix Hydrogen serving at non-root-path

roles/custom/matrix-client-hydrogen/defaults/main.yml

@@ -33,10 +33,9 @@ matrix_client_hydrogen_container_http_host_bind_port: ''
 # To inject your own other container labels, see `matrix_client_hydrogen_container_labels_additional_labels`.
 matrix_client_hydrogen_container_labels_traefik_enabled: true
 matrix_client_hydrogen_container_labels_traefik_docker_network: "{{ matrix_client_hydrogen_container_network }}"
-matrix_client_hydrogen_container_labels_traefik_hostname: "{{ matrix_server_fqn_element }}"
+matrix_client_hydrogen_container_labels_traefik_hostname: "{{ matrix_client_hydrogen_hostname }}"
 # The path prefix must either be `/` or not end with a slash (e.g. `/hydrogen`).
-# For now, only `/` is supported due to problems with serving Hydrogen at a subpath.
+matrix_client_hydrogen_container_labels_traefik_path_prefix: "{{ matrix_client_hydrogen_path_prefix }}"
-matrix_client_hydrogen_container_labels_traefik_path_prefix: /
 matrix_client_hydrogen_container_labels_traefik_rule: "Host(`{{ matrix_client_hydrogen_container_labels_traefik_hostname }}`){% if matrix_client_hydrogen_container_labels_traefik_path_prefix != '/' %} && PathPrefix(`{{ matrix_client_hydrogen_container_labels_traefik_path_prefix }}`){% endif %}"
 matrix_client_hydrogen_container_labels_traefik_priority: 0
 matrix_client_hydrogen_container_labels_traefik_entrypoints: web-secure
@@ -124,6 +123,18 @@ matrix_client_hydrogen_floc_optout_enabled: true
 # See: `matrix_client_hydrogen_http_header_strict_transport_security`
 matrix_client_hydrogen_hsts_preload_enabled: false
 
+# The hostname at which Hydrogen is served.
+# Only works with with Traefik reverse-proxying.
+# For matrix-nginx-proxy, `matrix_server_fqn_hydrogen` is used and this variable has no effect.
+matrix_client_hydrogen_hostname: "{{ matrix_server_fqn_hydrogen }}"
+
+# The path at which Hydrogen is exposed.
+# When matrix-nginx-proxy is used, setting this to values other than `/` will cause configuration mismatches and trouble.
+#
+# If Traefik is used, the hostname is also configurable - see `matrix_client_hydrogen_container_labels_traefik_hostname`.
+# This value must either be `/` or not end with a slash (e.g. `/hydrogen`).
+matrix_client_hydrogen_path_prefix: /
+
 # Controls whether the self-check feature should validate SSL certificates.
 matrix_client_hydrogen_self_check_validate_certificates: true
 
@@ -135,7 +146,6 @@ matrix_client_hydrogen_push:
 matrix_client_hydrogen_default_hs_url: ""
 matrix_client_hydrogen_bugReportEndpointUrl: "https://element.io/bugreports/submit"  # noqa var-naming
 
-
 # Default Hydrogen configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #

roles/custom/matrix-client-hydrogen/tasks/validate_config.yml

@@ -27,14 +27,3 @@
         msg: >-
           matrix_client_hydrogen_container_labels_traefik_path_prefix (`{{ matrix_client_hydrogen_container_labels_traefik_path_prefix }}`) must either be `/` or not end with a slash (e.g. `/hydrogen`).
       when: "matrix_client_hydrogen_container_labels_traefik_path_prefix != '/' and matrix_client_hydrogen_container_labels_traefik_path_prefix[-1] == '/'"
-
-    # For example, we're getting errors like this:
-    # > main.js:51 Failed to load stylesheet from https://DOMAIN/assets/theme-element-light.5316e268.css:
-    # despite having set a prefix of `/hydrogen`.
-    # This is yet to be investigated and workaround around.
-    - name: Fail if matrix_client_hydrogen_container_labels_traefik_path_prefix is not /
-      ansible.builtin.fail:
-        msg: >-
-          matrix_client_hydrogen_container_labels_traefik_path_prefix can only be set to `/` right now.
-          Serving Hydrogen from another path doesn't work just yet.
-      when: "matrix_client_hydrogen_container_labels_traefik_path_prefix != '/'"

roles/custom/matrix-client-hydrogen/templates/config.json.j2

@@ -3,7 +3,7 @@
 	"defaultHomeServer": {{ matrix_client_hydrogen_default_hs_url | string | to_json }},
 	"bugReportEndpointUrl": {{ matrix_client_hydrogen_bugReportEndpointUrl | to_json }},
 	"themeManifests": [
-		"assets/theme-element.json"
+		"{{ matrix_client_hydrogen_path_prefix }}assets/theme-element.json"
 	],
 	"defaultTheme": {
 		"light": "element-light",

roles/custom/matrix-synapse-admin/defaults/main.yml

@@ -134,6 +134,6 @@ matrix_synapse_admin_hsts_preload_enabled: false
 # The path at which Synapse Admin will be exposed on `matrix.DOMAIN` when matrix-nginx-proxy is used.
 # A path of `/` is likely not a good choice when matrix-nginx-proxy is used.
 #
-# If Traefik is used, the hostname name is configurable - see `matrix_synapse_admin_container_labels_traefik_hostname`.
+# If Traefik is used, the hostname is also configurable - see `matrix_synapse_admin_container_labels_traefik_hostname`.
 # This value must either be `/` or not end with a slash (e.g. `/synapse-admin`).
 matrix_synapse_admin_public_endpoint: /synapse-admin