mautrix-signal: expose bridge HTTP API (for mautrix-manager and similar)

Route the whole mautrix-signal HTTP port via Traefik under
`<matrix-fqn>/bridges/signal` and populate appservice.public_address,
reusing the matrix_bridges_exposure_* mechanism. The provisioning shared
secret is already auto-generated in group_vars, so the provisioning API
is enabled.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

group_vars/matrix_servers

@@ -1829,6 +1829,11 @@ matrix_mautrix_signal_metrics_proxying_enabled: "{{ matrix_mautrix_signal_metric
 matrix_mautrix_signal_metrics_proxying_hostname: "{{ matrix_metrics_exposure_hostname }}"
 matrix_mautrix_signal_metrics_proxying_path_prefix: "{{ matrix_metrics_exposure_path_prefix }}/mautrix-signal"
 
+matrix_mautrix_signal_scheme: "{{ 'https' if matrix_playbook_ssl_enabled else 'http' }}"
+matrix_mautrix_signal_exposure_enabled: "{{ matrix_bridges_exposure_enabled }}"
+matrix_mautrix_signal_exposure_hostname: "{{ matrix_bridges_exposure_hostname }}"
+matrix_mautrix_signal_exposure_path_prefix: "{{ matrix_bridges_exposure_path_prefix }}/signal"
+
 matrix_mautrix_signal_database_engine: "{{ 'postgres' if postgres_enabled else 'sqlite' }}"
 matrix_mautrix_signal_database_hostname: "{{ postgres_connection_hostname if postgres_enabled else '' }}"
 matrix_mautrix_signal_database_password: "{{ (matrix_homeserver_generic_secret_key + ':mau.signal.db') | hash('sha512') | to_uuid }}"

roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -46,6 +46,13 @@ matrix_mautrix_signal_homeserver_domain: "{{ matrix_domain }}"
 matrix_mautrix_signal_homeserver_async_media: false
 matrix_mautrix_signal_appservice_address: "http://matrix-mautrix-signal:8080"
 
+# Scheme of the bridge's public address (see `matrix_mautrix_signal_bridge_public_address`).
+matrix_mautrix_signal_scheme: https
+
+# The public base URL at which this bridge's HTTP API is reachable from outside (when exposed).
+# Used for the provisioning API's external-server (OpenID) flow and for public media links.
+matrix_mautrix_signal_bridge_public_address: "{{ (matrix_mautrix_signal_scheme + '://' + matrix_mautrix_signal_exposure_hostname + matrix_mautrix_signal_exposure_path_prefix) if matrix_mautrix_signal_exposure_enabled else '' }}"
+
 matrix_mautrix_signal_msc4190_enabled: "{{ matrix_bridges_msc4190_enabled }}"
 matrix_mautrix_signal_self_sign_enabled: "{{ matrix_bridges_self_sign_enabled }}"
 
@@ -100,6 +107,15 @@ matrix_mautrix_signal_container_labels_metrics_middleware_basic_auth_enabled: fa
 # See: https://doc.traefik.io/traefik/middlewares/http/basicauth/#users
 matrix_mautrix_signal_container_labels_metrics_middleware_basic_auth_users: ''
 
+# Controls whether labels will be added that expose mautrix-signal's HTTP API
+# (used by tools like mautrix-manager for bridge login) at `https://<hostname><path_prefix>`.
+matrix_mautrix_signal_container_labels_exposure_enabled: "{{ matrix_mautrix_signal_exposure_enabled }}"
+matrix_mautrix_signal_container_labels_exposure_traefik_rule: "Host(`{{ matrix_mautrix_signal_exposure_hostname }}`) && PathPrefix(`{{ matrix_mautrix_signal_exposure_path_prefix }}`)"
+matrix_mautrix_signal_container_labels_exposure_traefik_priority: 0
+matrix_mautrix_signal_container_labels_exposure_traefik_entrypoints: "{{ matrix_mautrix_signal_container_labels_traefik_entrypoints }}"
+matrix_mautrix_signal_container_labels_exposure_traefik_tls: "{{ matrix_mautrix_signal_container_labels_exposure_traefik_entrypoints != 'web' }}"
+matrix_mautrix_signal_container_labels_exposure_traefik_tls_certResolver: "{{ matrix_mautrix_signal_container_labels_traefik_tls_certResolver }}"  # noqa var-naming
+
 # matrix_mautrix_signal_container_labels_additional_labels contains a multiline string with additional labels to add to the container label file.
 # See `../templates/labels.j2` for details.
 #
@@ -150,6 +166,11 @@ matrix_mautrix_signal_metrics_proxying_enabled: false
 matrix_mautrix_signal_metrics_proxying_hostname: ''
 matrix_mautrix_signal_metrics_proxying_path_prefix: ''
 
+# Controls whether mautrix-signal's HTTP API is exposed publicly (used by tools like mautrix-manager for bridge login).
+matrix_mautrix_signal_exposure_enabled: false
+matrix_mautrix_signal_exposure_hostname: ''
+matrix_mautrix_signal_exposure_path_prefix: ''
+
 # Database-related configuration fields.
 #
 # To use SQLite, stick to these defaults.

roles/custom/matrix-bridge-mautrix-signal/templates/config.yaml.j2

@@ -171,7 +171,7 @@ appservice:
 
     # A public address that external services can use to reach this appservice.
     # This value doesn't affect the registration file.
-    public_address: ""
+    public_address: {{ matrix_mautrix_signal_bridge_public_address | to_json }}
 
     # The hostname and port where this appservice should listen.
     # For Docker, you generally have to change the hostname to 0.0.0.0.

roles/custom/matrix-bridge-mautrix-signal/templates/labels.j2

@@ -46,6 +46,39 @@ traefik.http.routers.matrix-mautrix-signal-metrics.tls.certResolver={{ matrix_ma
 ############################################################
 {% endif %}
 
+{% if matrix_mautrix_signal_container_labels_exposure_enabled %}
+############################################################
+#                                                          #
+# Bridge API exposure                                      #
+#                                                          #
+############################################################
+
+traefik.http.services.matrix-mautrix-signal-exposure.loadbalancer.server.port=8080
+
+traefik.http.middlewares.matrix-mautrix-signal-exposure-strip-prefix.stripprefix.prefixes={{ matrix_mautrix_signal_exposure_path_prefix }}
+traefik.http.routers.matrix-mautrix-signal-exposure.middlewares=matrix-mautrix-signal-exposure-strip-prefix
+
+traefik.http.routers.matrix-mautrix-signal-exposure.rule={{ matrix_mautrix_signal_container_labels_exposure_traefik_rule }}
+
+{% if matrix_mautrix_signal_container_labels_exposure_traefik_priority | int > 0 %}
+traefik.http.routers.matrix-mautrix-signal-exposure.priority={{ matrix_mautrix_signal_container_labels_exposure_traefik_priority }}
+{% endif %}
+
+traefik.http.routers.matrix-mautrix-signal-exposure.service=matrix-mautrix-signal-exposure
+traefik.http.routers.matrix-mautrix-signal-exposure.entrypoints={{ matrix_mautrix_signal_container_labels_exposure_traefik_entrypoints }}
+
+traefik.http.routers.matrix-mautrix-signal-exposure.tls={{ matrix_mautrix_signal_container_labels_exposure_traefik_tls | to_json }}
+{% if matrix_mautrix_signal_container_labels_exposure_traefik_tls %}
+traefik.http.routers.matrix-mautrix-signal-exposure.tls.certResolver={{ matrix_mautrix_signal_container_labels_exposure_traefik_tls_certResolver }}
+{% endif %}
+
+############################################################
+#                                                          #
+# /Bridge API exposure                                     #
+#                                                          #
+############################################################
+{% endif %}
+
 
 {% endif %}