Merge pull request #1974 from MdotAmaan/master

Add Mautrix Discord Bridge

docs/configuring-playbook-bridge-mautrix-discord.md

@@ -0,0 +1,45 @@
+# Setting up Mautrix Discord (optional)
+
+**Note**: bridging to [Discord](https://discordapp.com/) can also happen via the [mx-puppet-discord](configuring-playbook-bridge-mx-puppet-discord.md) and [matrix-appservice-discord](configuring-playbook-bridge-appservice-discord.md) bridges supported by the playbook.
+
+The playbook can install and configure [mautrix-discord](https://github.com/mautrix/discord) for you.
+
+See the project's [documentation](https://docs.mau.fi/bridges/go/discord/index.html) to learn what it does and why it might be useful to you.
+
+Use the following playbook configuration:
+
+```yaml
+matrix_mautrix_discord_enabled: true
+``` 
+
+## Set up Double Puppeting
+
+If you'd like to use [Double Puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) (hint: you most likely do), you have 2 ways of going about it.
+
+### Method 1: automatically, by enabling Shared Secret Auth
+
+The bridge will automatically perform Double Puppeting if you enable [Shared Secret Auth](configuring-playbook-shared-secret-auth.md) for this playbook.
+
+This is the recommended way of setting up Double Puppeting, as it's easier to accomplish, works for all your users automatically, and has less of a chance of breaking in the future.
+
+### Method 2: manually, by asking each user to provide a working access token
+
+**Note**: This method for enabling Double Puppeting can be configured only after you've already set up bridging (see [Usage](#usage)).
+
+When using this method, **each user** that wishes to enable Double Puppeting needs to follow the following steps:
+
+- retrieve a Matrix access token for yourself. You can use the following command:
+
+```
+curl \
+--data '{"identifier": {"type": "m.id.user", "user": "YOUR_MATRIX_USERNAME" }, "password": "YOUR_MATRIX_PASSWORD", "type": "m.login.password", "device_id": "Mautrix-Discord", "initial_device_display_name": "Mautrix-Discord"}' \
+https://matrix.DOMAIN/_matrix/client/r0/login
+```
+
+- send the access token to the bot. Example: `login-matrix MATRIX_ACCESS_TOKEN_HERE`
+
+- make sure you don't log out the `Mautrix-Discord` device some time in the future, as that would break the Double Puppeting feature
+
+## Usage
+
+You then need to start a chat with `@discordbot:YOUR_DOMAIN` (where `YOUR_DOMAIN` is your base domain, not the `matrix.` domain).

docs/configuring-playbook.md

@@ -93,6 +93,8 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 ### Bridging other networks
 
+- [Setting up Mautrix Discord bridging](configuring-playbook-bridge-mautrix-discord.md) (optional)
+
 - [Setting up Mautrix Telegram bridging](configuring-playbook-bridge-mautrix-telegram.md) (optional)
 
 - [Setting up Mautrix Whatsapp bridging](configuring-playbook-bridge-mautrix-whatsapp.md) (optional)

group_vars/matrix_servers

@@ -661,6 +661,44 @@ matrix_mautrix_whatsapp_database_password: "{{ '%s' | format(matrix_homeserver_g
 #
 ######################################################################
 
+######################################################################
+#
+# matrix-bridge-mautrix-discord
+#
+######################################################################
+
+# We don't enable bridges by default.
+matrix_mautrix_discord_enabled: false
+
+matrix_mautrix_discord_container_image_self_build: "{{ matrix_architecture not in ['arm64', 'amd64'] }}"
+
+matrix_mautrix_discord_systemd_required_services_list: |
+  {{
+    ['docker.service']
+    +
+    ['matrix-' + matrix_homeserver_implementation + '.service']
+    +
+    (['matrix-postgres.service'] if matrix_postgres_enabled else [])
+    +
+    (['matrix-nginx-proxy.service'] if matrix_nginx_proxy_enabled else [])
+  }} 
+
+matrix_mautrix_discord_appservice_token: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'maudisc.as.tok') | to_uuid }}"
+
+matrix_mautrix_discord_homeserver_token: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'maudisc.hs.tok') | to_uuid }}"
+
+matrix_mautrix_discord_login_shared_secret: "{{ matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret if matrix_synapse_ext_password_provider_shared_secret_auth_enabled else '' }}"
+
+# Postgres is the default, except if not using `matrix_postgres` (internal postgres)
+matrix_mautrix_discord_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'sqlite' }}"
+matrix_mautrix_discord_database_password: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'maudiscord.db') | to_uuid }}"
+
+######################################################################
+#
+# /matrix-bridge-mautrix-discord
+#
+######################################################################
+
 ######################################################################
 #
 # matrix-sms-bridge
@@ -1914,6 +1952,12 @@ matrix_postgres_additional_databases: |
       'password': matrix_mautrix_whatsapp_database_password,
     }] if (matrix_mautrix_whatsapp_enabled and matrix_mautrix_whatsapp_database_engine == 'postgres' and matrix_mautrix_whatsapp_database_hostname == 'matrix-postgres') else [])
     +
+    ([{
+      'name': matrix_mautrix_discord_database_name,
+      'username': matrix_mautrix_discord_database_username,
+      'password': matrix_mautrix_discord_database_password,
+    }] if (matrix_mautrix_discord_enabled and matrix_mautrix_discord_database_engine == 'postgres' and matrix_mautrix_discord_database_hostname == 'matrix-postgres') else [])
+    +
     ([{
       'name': matrix_mx_puppet_slack_database_name,
       'username': matrix_mx_puppet_slack_database_username,

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

@@ -0,0 +1,142 @@
+---
+# mautrix-discord is a Matrix <-> Discord bridge
+# Project source code URL: https://github.com/mautrix/discord
+
+matrix_mautrix_discord_enabled: true
+
+matrix_mautrix_discord_container_image_self_build: false
+matrix_mautrix_discord_container_image_self_build_repo: "https://mau.dev/mautrix/discord.git"
+matrix_mautrix_discord_container_image_self_build_branch: "{{ 'main' if matrix_mautrix_discord_version == 'latest' else matrix_mautrix_discord_version }}"
+
+matrix_mautrix_discord_version: latest
+# See: https://mau.dev/mautrix/discord/container_registry
+matrix_mautrix_discord_docker_image: "{{ matrix_mautrix_discord_docker_image_name_prefix }}mautrix/discord:{{ matrix_mautrix_discord_version }}"
+matrix_mautrix_discord_docker_image_name_prefix: "{{ 'localhost/' if matrix_mautrix_discord_container_image_self_build else 'dock.mau.dev/' }}"
+matrix_mautrix_discord_docker_image_force_pull: "{{ matrix_mautrix_discord_docker_image.endswith(':latest') }}"
+
+matrix_mautrix_discord_base_path: "{{ matrix_base_data_path }}/mautrix-discord"
+matrix_mautrix_discord_config_path: "{{ matrix_mautrix_discord_base_path }}/config"
+matrix_mautrix_discord_data_path: "{{ matrix_mautrix_discord_base_path }}/data"
+matrix_mautrix_discord_docker_src_files_path: "{{ matrix_mautrix_discord_base_path }}/docker-src"
+
+matrix_mautrix_discord_homeserver_address: "{{ matrix_homeserver_container_url }}"
+matrix_mautrix_discord_homeserver_domain: "{{ matrix_domain }}"
+matrix_mautrix_discord_appservice_address: "http://matrix-mautrix-discord:8080"
+
+matrix_mautrix_discord_command_prefix: "!discord"
+
+matrix_mautrix_discord_bridge_permissions: |
+  {{
+    {matrix_mautrix_discord_homeserver_domain: 'user'}
+    | combine({matrix_admin: 'admin'} if matrix_admin else {})
+  }}
+
+# A list of extra arguments to pass to the container
+matrix_mautrix_discord_container_extra_arguments: []
+
+# List of systemd services that matrix-mautrix-discord.service depends on.
+matrix_mautrix_discord_systemd_required_services_list: ['docker.service']
+
+# List of systemd services that matrix-mautrix-discord.service wants
+matrix_mautrix_discord_systemd_wanted_services_list: []
+
+matrix_mautrix_discord_appservice_token: ''
+matrix_mautrix_discord_homeserver_token: ''
+
+matrix_mautrix_discord_appservice_bot_username: discordbot
+
+# Minimum severity of journal log messages.
+# Options: debug, info, warn, error, fatal
+matrix_mautrix_discord_logging_level: 'warn'
+
+# Whether or not created rooms should have federation enabled.
+# If false, created portal rooms will never be federated.
+matrix_mautrix_discord_federate_rooms: true
+
+# Database-related configuration fields.
+#
+# To use SQLite, stick to these defaults.
+#
+# To use Postgres:
+# - change the engine (`matrix_mautrix_discord_database_engine: 'postgres'`)
+# - adjust your database credentials via the `matrix_mautrix_discord_database_*` variables
+matrix_mautrix_discord_database_engine: 'sqlite'
+
+matrix_mautrix_discord_sqlite_database_path_local: "{{ matrix_mautrix_discord_data_path }}/mautrix-discord.db"
+matrix_mautrix_discord_sqlite_database_path_in_container: "/data/mautrix-discord.db"
+
+matrix_mautrix_discord_database_username: 'matrix_mautrix_discord'
+matrix_mautrix_discord_database_password: 'some-password'
+matrix_mautrix_discord_database_hostname: 'matrix-postgres'
+matrix_mautrix_discord_database_port: 5432
+matrix_mautrix_discord_database_name: 'matrix_mautrix_discord'
+
+matrix_mautrix_discord_database_connection_string: 'postgresql://{{ matrix_mautrix_discord_database_username }}:{{ matrix_mautrix_discord_database_password }}@{{ matrix_mautrix_discord_database_hostname }}:{{ matrix_mautrix_discord_database_port }}/{{ matrix_mautrix_discord_database_name }}?sslmode=disable'
+
+matrix_mautrix_discord_appservice_database_type: "{{
+	{
+		'sqlite': 'sqlite3',
+		'postgres':'postgres',
+	}[matrix_mautrix_discord_database_engine]
+}}"
+
+matrix_mautrix_discord_appservice_database_uri: "{{
+	{
+		'sqlite': matrix_mautrix_discord_sqlite_database_path_in_container,
+		'postgres': matrix_mautrix_discord_database_connection_string,
+	}[matrix_mautrix_discord_database_engine]
+}}"
+
+# Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
+matrix_mautrix_discord_login_shared_secret: ''
+matrix_mautrix_discord_bridge_login_shared_secret_map:
+  "{{ {matrix_mautrix_discord_homeserver_domain: matrix_mautrix_discord_login_shared_secret} if matrix_mautrix_discord_login_shared_secret else {} }}"
+
+# Servers to always allow double puppeting from
+matrix_mautrix_discord_bridge_double_puppet_server_map:
+  "{{ matrix_mautrix_discord_homeserver_domain :  matrix_mautrix_discord_homeserver_address }}"
+
+# Default mautrix-discord 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_mautrix_discord_configuration_extension_yaml`)
+# or completely replace this variable with your own template.
+matrix_mautrix_discord_configuration_yaml: "{{ lookup('template', 'templates/config.yaml.j2') }}"
+
+matrix_mautrix_discord_configuration_extension_yaml: |
+  # Your custom YAML configuration goes here.
+  # This configuration extends the default starting configuration (`matrix_mautrix_discord_configuration_yaml`).
+  #
+  # 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_mautrix_discord_configuration_yaml`.
+
+matrix_mautrix_discord_configuration_extension: "{{ matrix_mautrix_discord_configuration_extension_yaml | from_yaml if matrix_mautrix_discord_configuration_extension_yaml | from_yaml is mapping else {} }}"
+
+# Holds the final configuration (a combination of the default and its extension).
+# You most likely don't need to touch this variable. Instead, see `matrix_mautrix_discord_configuration_yaml`.
+matrix_mautrix_discord_configuration: "{{ matrix_mautrix_discord_configuration_yaml | from_yaml | combine(matrix_mautrix_discord_configuration_extension, recursive=True) }}"
+
+matrix_mautrix_discord_registration_yaml: |
+  id: discord
+  url: {{ matrix_mautrix_discord_appservice_address }}
+  as_token: "{{ matrix_mautrix_discord_appservice_token }}"
+  hs_token: "{{ matrix_mautrix_discord_homeserver_token }}"
+  # See https://github.com/mautrix/signal/issues/43
+  sender_localpart: _bot_{{ matrix_mautrix_discord_appservice_bot_username }}
+  rate_limited: false
+  namespaces:
+      users:
+      - regex: '^@discord_[0-9]+:{{ matrix_mautrix_discord_homeserver_domain | regex_escape }}$'
+        exclusive: true
+      - exclusive: true
+        regex: '^@{{ matrix_mautrix_discord_appservice_bot_username | regex_escape }}:{{ matrix_mautrix_discord_homeserver_domain | regex_escape }}$'
+  de.sorunome.msc2409.push_ephemeral: true
+
+matrix_mautrix_discord_registration: "{{ matrix_mautrix_discord_registration_yaml | from_yaml }}"
+
+# Enable End-to-bridge encryption
+matrix_mautrix_discord_bridge_encryption_allow: false
+matrix_mautrix_discord_bridge_encryption_default: "{{ matrix_mautrix_discord_bridge_encryption_allow }}"
+matrix_mautrix_discord_bridge_encryption_key_sharing_allow: "{{ matrix_mautrix_discord_bridge_encryption_allow }}"

roles/matrix-bridge-mautrix-discord/tasks/init.yml

@@ -0,0 +1,21 @@
+---
+- ansible.builtin.set_fact:
+    matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-mautrix-discord.service'] }}"
+  when: matrix_mautrix_discord_enabled | bool
+
+# If the matrix-synapse role is not used, these variables may not exist.
+- ansible.builtin.set_fact:
+    matrix_synapse_container_extra_arguments: >
+      {{
+        matrix_synapse_container_extra_arguments | default([])
+        +
+        ["--mount type=bind,src={{ matrix_mautrix_discord_config_path }}/registration.yaml,dst=/matrix-mautrix-discord-registration.yaml,ro"]
+      }}
+
+    matrix_synapse_app_service_config_files: >
+      {{
+        matrix_synapse_app_service_config_files | default([])
+        +
+        ["/matrix-mautrix-discord-registration.yaml"]
+      }}
+  when: matrix_mautrix_discord_enabled | bool

roles/matrix-bridge-mautrix-discord/tasks/main.yml

@@ -0,0 +1,22 @@
+---
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/init.yml"
+  tags:
+    - always
+
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/validate_config.yml"
+  when: "run_setup | bool and matrix_mautrix_discord_enabled | bool"
+  tags:
+    - setup-all
+    - setup-mautrix-discord
+
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/setup_install.yml"
+  when: "run_setup and matrix_mautrix_discord_enabled"
+  tags:
+    - setup-all
+    - setup-mautrix-discord
+
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/setup_uninstall.yml"
+  when: "run_setup and not matrix_mautrix_discord_enabled"
+  tags:
+    - setup-all
+    - setup-mautrix-discord

roles/matrix-bridge-mautrix-discord/tasks/setup_install.yml

@@ -0,0 +1,122 @@
+---
+
+# If the matrix-synapse role is not used, `matrix_synapse_role_executed` won't exist.
+# We don't want to fail in such cases.
+- name: Fail if matrix-synapse role already executed
+  ansible.builtin.fail:
+    msg: >-
+      The matrix-bridge-mautrix-discord role needs to execute before the matrix-synapse role.
+  when: "matrix_synapse_role_executed | default(False)"
+
+- ansible.builtin.set_fact:
+    matrix_mautrix_discord_requires_restart: false
+
+- block:
+    - name: Check if an SQLite database already exists
+      ansible.builtin.stat:
+        path: "{{ matrix_mautrix_discord_sqlite_database_path_local }}"
+      register: matrix_mautrix_discord_sqlite_database_path_local_stat_result
+
+    - block:
+        - ansible.builtin.set_fact:
+            matrix_postgres_db_migration_request:
+              src: "{{ matrix_mautrix_discord_sqlite_database_path_local }}"
+              dst: "{{ matrix_mautrix_discord_database_connection_string }}"
+              caller: "{{ role_path | basename }}"
+              engine_variable_name: 'matrix_mautrix_discord_database_engine'
+              engine_old: 'sqlite'
+              systemd_services_to_stop: ['matrix-mautrix-discord.service']
+              pgloader_options: ['--with "quote identifiers"']
+
+        - ansible.builtin.import_role:
+            name: matrix-postgres
+            tasks_from: migrate_db_to_postgres
+
+        - ansible.builtin.set_fact:
+            matrix_mautrix_discord_requires_restart: true
+      when: "matrix_mautrix_discord_sqlite_database_path_local_stat_result.stat.exists | bool"
+  when: "matrix_mautrix_discord_database_engine == 'postgres'"
+
+
+- name: Ensure Mautrix Discord paths exists
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: directory
+    mode: 0750
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+  with_items:
+    - {path: "{{ matrix_mautrix_discord_base_path }}", when: true}
+    - {path: "{{ matrix_mautrix_discord_config_path }}", when: true}
+    - {path: "{{ matrix_mautrix_discord_data_path }}", when: true}
+    - {path: "{{ matrix_mautrix_discord_docker_src_files_path }}", when: "{{ matrix_mautrix_discord_container_image_self_build }}"}
+  when: item.when | bool
+
+- name: Ensure Mautrix Discord image is pulled
+  docker_image:
+    name: "{{ matrix_mautrix_discord_docker_image }}"
+    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
+    force_source: "{{ matrix_mautrix_discord_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
+    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_mautrix_discord_docker_image_force_pull }}"
+  when: not matrix_mautrix_discord_container_image_self_build
+  register: result
+  retries: "{{ matrix_container_retries_count }}"
+  delay: "{{ matrix_container_retries_delay }}"
+  until: result is not failed
+
+- name: Ensure Mautrix discord repository is present on self-build
+  ansible.builtin.git:
+    repo: "{{ matrix_mautrix_discord_container_image_self_build_repo }}"
+    dest: "{{ matrix_mautrix_discord_docker_src_files_path }}"
+    version: "{{ matrix_mautrix_discord_container_image_self_build_branch }}"
+    force: "yes"
+  become: true
+  become_user: "{{ matrix_user_username }}"
+  register: matrix_mautrix_discord_git_pull_results
+  when: "matrix_mautrix_discord_container_image_self_build | bool"
+
+- name: Ensure Mautrix discord Docker image is built
+  docker_image:
+    name: "{{ matrix_mautrix_discord_docker_image }}"
+    source: build
+    force_source: "{{ matrix_mautrix_discord_git_pull_results.changed if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
+    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_mautrix_discord_git_pull_results.changed }}"
+    build:
+      dockerfile: Dockerfile
+      path: "{{ matrix_mautrix_discord_docker_src_files_path }}"
+      pull: true
+  when: "matrix_mautrix_discord_container_image_self_build | bool"
+
+- name: Ensure mautrix-discord config.yaml installed
+  ansible.builtin.copy:
+    content: "{{ matrix_mautrix_discord_configuration | to_nice_yaml(indent=2, width=999999) }}"
+    dest: "{{ matrix_mautrix_discord_config_path }}/config.yaml"
+    mode: 0644
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+
+- name: Ensure mautrix-discord registration.yaml installed
+  ansible.builtin.copy:
+    content: "{{ matrix_mautrix_discord_registration | to_nice_yaml(indent=2, width=999999) }}"
+    dest: "{{ matrix_mautrix_discord_config_path }}/registration.yaml"
+    mode: 0644
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+
+- name: Ensure matrix-mautrix-discord.service installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/systemd/matrix-mautrix-discord.service.j2"
+    dest: "{{ matrix_systemd_path }}/matrix-mautrix-discord.service"
+    mode: 0644
+  register: matrix_mautrix_discord_systemd_service_result
+
+- name: Ensure systemd reloaded after matrix-mautrix-discord.service installation
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "matrix_mautrix_discord_systemd_service_result.changed"
+
+- name: Ensure matrix-mautrix-discord.service restarted, if necessary
+  ansible.builtin.service:
+    name: "matrix-mautrix-discord.service"
+    state: restarted
+  when: "matrix_mautrix_discord_requires_restart | bool"

roles/matrix-bridge-mautrix-discord/tasks/setup_uninstall.yml

@@ -0,0 +1,25 @@
+---
+
+- name: Check existence of matrix-mautrix-discord service
+  ansible.builtin.stat:
+    path: "{{ matrix_systemd_path }}/matrix-mautrix-discord.service"
+  register: matrix_mautrix_discord_service_stat
+
+- name: Ensure matrix-mautrix-discord is stopped
+  ansible.builtin.service:
+    name: matrix-mautrix-discord
+    state: stopped
+    enabled: false
+    daemon_reload: true
+  when: "matrix_mautrix_discord_service_stat.stat.exists"
+
+- name: Ensure matrix-mautrix-discord.service doesn't exist
+  ansible.builtin.file:
+    path: "{{ matrix_systemd_path }}/matrix-mautrix-discord.service"
+    state: absent
+  when: "matrix_mautrix_discord_service_stat.stat.exists"
+
+- name: Ensure systemd reloaded after matrix-mautrix-discord.service removal
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "matrix_mautrix_discord_service_stat.stat.exists"

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

@@ -0,0 +1,10 @@
+---
+
+- name: Fail if required settings not defined
+  ansible.builtin.fail:
+    msg: >-
+      You need to define a required configuration setting (`{{ item }}`).
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_mautrix_discord_appservice_token"
+    - "matrix_mautrix_discord_homeserver_token"

roles/matrix-bridge-mautrix-discord/templates/config.yaml.j2

@@ -0,0 +1,221 @@
+#jinja2: lstrip_blocks: "True"
+# Homeserver details.
+homeserver:
+    # The address that this appservice can use to connect to the homeserver.
+    address: {{ matrix_mautrix_discord_homeserver_address | to_json }}
+    # The domain of the homeserver (for MXIDs, etc).
+    domain: {{ matrix_mautrix_discord_homeserver_domain | to_json }}    
+    # Is the homeserver actually mautrix-asmux?
+    asmux: false
+    # The URL to push real-time bridge status to.
+    # If set, the bridge will make POST requests to this URL whenever a user's discord connection state changes.
+    # The bridge will use the appservice as_token to authorize requests.
+    status_endpoint: null
+    # Endpoint for reporting per-message status.
+    message_send_checkpoint_endpoint: null
+    # Does the homeserver support https://github.com/matrix-org/matrix-spec-proposals/pull/2246?
+    async_media: false
+
+# Application service host/registration related details.
+# Changing these values requires regeneration of the registration.
+appservice:
+    # The address that the homeserver can use to connect to this appservice.
+    address: {{ matrix_mautrix_discord_appservice_address | to_json }}
+    
+    # The hostname and port where this appservice should listen.
+    hostname: 0.0.0.0
+    port: 8080
+    
+    # Database config.
+    database:
+        # The database type. "sqlite3" and "postgres" are supported.
+        type: {{ matrix_mautrix_discord_appservice_database_type|to_json }}
+        # The database URI.
+        #   SQLite: File name is enough. https://github.com/mattn/go-sqlite3#connection-string
+        #   Postgres: Connection string. For example, postgres://user:password@host/database?sslmode=disable
+        #             To connect via Unix socket, use something like postgres:///dbname?host=/var/run/postgresql
+        uri: {{ matrix_mautrix_discord_appservice_database_uri|to_json }}
+        # Maximum number of connections. Mostly relevant for Postgres.
+        max_open_conns: 20
+        max_idle_conns: 2
+        # Maximum connection idle time and lifetime before they're closed. Disabled if null.
+        # Parsed with https://pkg.go.dev/time#ParseDuration
+        max_conn_idle_time: null
+        max_conn_lifetime: null
+    
+    # The unique ID of this appservice.
+    id: discord
+    # Appservice bot details.
+    bot:
+        # Username of the appservice bot.
+        username: {{ matrix_mautrix_discord_appservice_bot_username|to_json }}
+        # Display name and avatar for bot. Set to "remove" to remove display name/avatar, leave empty
+        # to leave display name/avatar as-is.
+        displayname: Discord bridge bot
+        avatar: mxc://maunium.net/nIdEykemnwdisvHbpxflpDlC
+    # Whether or not to receive ephemeral events via appservice transactions.
+    # Requires MSC2409 support (i.e. Synapse 1.22+).
+    ephemeral_events: true
+    
+    # Authentication tokens for AS <-> HS communication. Autogenerated; do not modify.
+    as_token: {{ matrix_mautrix_discord_appservice_token | to_json }}
+    hs_token: {{ matrix_mautrix_discord_homeserver_token | to_json }}
+
+# Bridge config
+bridge:
+    # Localpart template of MXIDs for Discord users.
+    # {{ '{{.}}' }} is replaced with the internal ID of the Discord user.
+    username_template: "{{ 'discord_{{.}}' }}"
+    # Displayname template for Discord users. This is also used as the room name in DMs if private_chat_portal_meta is enabled.
+    # Available variables:
+    #  {{ '{{.ID}}' }} - Internal user ID
+    #  {{ '{{.Username}}' }} - User's displayname on Discord
+    #  {{ '{{.Discriminator}}' }} - The 4 numbers after the name on Discord
+    #  {{ '{{.Bot}}' }} - Whether the user is a bot
+    #  {{ '{{.System}}' }} - Whether the user is an official system user
+    displayname_template: "{{ '{{.Username}} {{if .Bot}} (bot){{end}}' }}"
+    # Displayname template for Discord channels (bridged as rooms, or spaces when type=4).
+    # Available variables:
+    #  {{ '{{.Name}}' }} - Channel name, or user displayname (pre-formatted with displayname_template) in DMs.
+    #  {{ '{{.ParentName}}' }} - Parent channel name (used for categories).
+    #  {{ '{{.GuildName}}' }} - Guild name.
+    #  {{ '{{.NSFW}}' }} - Whether the channel is marked as NSFW.
+    #  {{ '{{.Type}}' }} - Channel type (see values at https://github.com/bwmarrin/discordgo/blob/v0.25.0/structs.go#L251-L267)
+    channel_name_template: "{{ '{{if or (eq .Type 3) (eq .Type 4)}}{{.Name}}{{else}}#{{.Name}}{{end}}' }}"
+    # Displayname template for Discord guilds (bridged as spaces).
+    # Available variables:
+    #  {{ '{{.Name}}' }} - Guild name
+    guild_name_template: "{{ '{{.Name}}' }}"
+    # Should the bridge explicitly set the avatar and room name for DM portal rooms?
+    # This is implicitly enabled in encrypted rooms.
+    private_chat_portal_meta: false
+    portal_message_buffer: 128
+    # Number of private channel portals to create on bridge startup.
+    # Other portals will be created when receiving messages.
+    startup_private_channel_create_limit: 5
+    # Should the bridge send a read receipt from the bridge bot when a message has been sent to Discord?
+    delivery_receipts: false
+    # Whether the bridge should send the message status as a custom com.beeper.message_send_status event.
+    message_status_events: true
+    # Whether the bridge should send error notices via m.notice events when a message fails to bridge.
+    message_error_notices: true
+    # Should the bridge use space-restricted join rules instead of invite-only for guild rooms?
+    # This can avoid unnecessary invite events in guild rooms when members are synced in.
+    restricted_rooms: true
+    # Should the bridge update the m.direct account data event when double puppeting is enabled.
+    # Note that updating the m.direct event is not atomic (except with mautrix-asmux)
+    # and is therefore prone to race conditions.
+    sync_direct_chat_list: false
+    # Set this to true to tell the bridge to re-send m.bridge events to all rooms on the next run.
+    # This field will automatically be changed back to false after it, except if the config file is not writable.
+    resend_bridge_info: false
+    # Should the bridge attempt to completely delete portal rooms when a channel is deleted on Discord?
+    # If true, the bridge will try to kick Matrix users from the room. Otherwise, the bridge only makes ghosts leave.
+    delete_portal_on_channel_delete: false
+    # Whether or not created rooms should have federation enabled.
+    # If false, created portal rooms will never be federated.
+    federate_rooms: {{ matrix_mautrix_discord_federate_rooms|to_json }}
+    # Servers to always allow double puppeting from
+    double_puppet_server_map:
+        "{{ matrix_mautrix_discord_homeserver_domain }}": {{ matrix_mautrix_discord_homeserver_address }}
+    # Allow using double puppeting from any server with a valid client .well-known file.
+    double_puppet_allow_discovery: false
+    # Shared secrets for https://github.com/devture/matrix-synapse-shared-secret-auth
+    #
+    # If set, double puppeting will be enabled automatically for local users
+    # instead of users having to find an access token and run `login-matrix`
+    # manually.
+    login_shared_secret_map: {{ matrix_mautrix_discord_bridge_login_shared_secret_map|to_json }}
+    
+    # The prefix for commands. Only required in non-management rooms.
+    command_prefix: "{{ matrix_mautrix_discord_command_prefix }}"
+    
+    # Messages sent upon joining a management room.
+    # Markdown is supported. The defaults are listed below.
+    management_room_text:
+        # Sent when joining a room.
+        welcome: "Hello, I'm a Discord bridge bot."
+        # Sent when joining a management room and the user is already logged in.
+        welcome_connected: "Use `help` for help."
+        # Sent when joining a management room and the user is not logged in.
+        welcome_unconnected: "Use `help` for help or `login` to log in."
+        # Optional extra text sent when joining a management room.
+        additional_help: ""
+    
+    # End-to-bridge encryption support options.
+    #
+    # See https://docs.mau.fi/bridges/general/end-to-bridge-encryption.html for more info.
+    encryption:
+        # Allow encryption, work in group chat rooms with e2ee enabled
+        allow: {{ matrix_mautrix_discord_bridge_encryption_allow|to_json }}
+        # Default to encryption, force-enable encryption in all portals the bridge creates
+        # This will cause the bridge bot to be in private chats for the encryption to work properly.
+        default: {{ matrix_mautrix_discord_bridge_encryption_default|to_json }}
+        # Require encryption, drop any unencrypted messages.
+        require: false
+        # Enable key sharing? If enabled, key requests for rooms where users are in will be fulfilled.
+        # You must use a client that supports requesting keys from other users to use this feature.
+        allow_key_sharing: {{ matrix_mautrix_discord_bridge_encryption_key_sharing_allow|to_json }}
+        # What level of device verification should be required from users?
+        #
+        # Valid levels:
+        #   unverified - Send keys to all device in the room.
+        #   cross-signed-untrusted - Require valid cross-signing, but trust all cross-signing keys.
+        #   cross-signed-tofu - Require valid cross-signing, trust cross-signing keys on first use (and reject changes).
+        #   cross-signed-verified - Require valid cross-signing, plus a valid user signature from the bridge bot.
+        #                           Note that creating user signatures from the bridge bot is not currently possible.
+        #   verified - Require manual per-device verification
+        #              (currently only possible by modifying the `trust` column in the `crypto_device` database table).
+        verification_levels:
+            # Minimum level for which the bridge should send keys to when bridging messages from WhatsApp to Matrix.
+            receive: unverified
+            # Minimum level that the bridge should accept for incoming Matrix messages.
+            send: unverified
+            # Minimum level that the bridge should require for accepting key requests.
+            share: cross-signed-tofu
+        # Options for Megolm room key rotation. These options allow you to
+        # configure the m.room.encryption event content. See:
+        # https://spec.matrix.org/v1.3/client-server-api/#mroomencryption for
+        # more information about that event.
+        rotation:
+            # Enable custom Megolm room key rotation settings. Note that these
+            # settings will only apply to rooms created after this option is
+            # set.
+            enable_custom: false
+            # The maximum number of milliseconds a session should be used
+            # before changing it. The Matrix spec recommends 604800000 (a week)
+            # as the default.
+            milliseconds: 604800000
+            # The maximum number of messages that should be sent with a given a
+            # session before changing it. The Matrix spec recommends 100 as the
+            # default.
+            messages: 100
+    
+    # Settings for provisioning API
+    provisioning:
+        # Prefix for the provisioning API paths.
+        prefix: /_matrix/provision
+        # Shared secret for authentication. If set to "generate", a random secret will be generated,
+        # or if set to "disable", the provisioning API will be disabled.
+        shared_secret: generate
+    
+    # Permissions for using the bridge.
+    # Permitted values:
+    #    relay - Talk through the relaybot (if enabled), no access otherwise
+    #     user - Access to use the bridge to chat with a Discord account.
+    #    admin - User level and some additional administration tools
+    # Permitted keys:
+    #        * - All Matrix users
+    #   domain - All users on that homeserver
+    #     mxid - Specific user
+    permissions: {{ matrix_mautrix_discord_bridge_permissions|to_json }}
+
+logging:
+    directory: ./logs
+    file_name_format: ''
+    file_date_format: "2006-01-02"
+    file_mode: 384
+    timestamp_format: Jan _2, 2006 15:04:05
+    print_level: {{ matrix_mautrix_discord_logging_level | to_json }}
+    print_json: false
+    file_json: false

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

@@ -0,0 +1,43 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Mautrix Discord bridge
+{% for service in matrix_mautrix_discord_systemd_required_services_list %}
+Requires={{ service }}
+After={{ service }}
+{% endfor %}
+{% for service in matrix_mautrix_discord_systemd_wanted_services_list %}
+Wants={{ service }}
+{% endfor %}
+DefaultDependencies=no
+
+[Service]
+Type=simple
+Environment="HOME={{ matrix_systemd_unit_home_path }}"
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-mautrix-discord 2>/dev/null || true'
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-mautrix-discord 2>/dev/null || true'
+
+# Intentional delay, so that the homeserver (we likely depend on) can manage to start.
+ExecStartPre={{ matrix_host_command_sleep }} 5
+
+ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-mautrix-discord \
+			--log-driver=none \
+			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+			--cap-drop=ALL \
+			--network={{ matrix_docker_network }} \
+			--mount type=bind,src={{ matrix_mautrix_discord_config_path }},dst=/config,ro \
+			--mount type=bind,src={{ matrix_mautrix_discord_data_path }},dst=/data \
+			--workdir=/data \
+			{% for arg in matrix_mautrix_discord_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_mautrix_discord_docker_image }} \
+			/usr/bin/mautrix-discord -c /config/config.yaml -r /config/registration.yaml
+
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-mautrix-discord 2>/dev/null || true'
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-mautrix-discord 2>/dev/null || true'
+Restart=always
+RestartSec=30
+SyslogIdentifier=matrix-mautrix-discord
+
+[Install]
+WantedBy=multi-user.target

setup.yml

@@ -28,6 +28,7 @@
     - matrix-bridge-mautrix-signal
     - matrix-bridge-mautrix-telegram
     - matrix-bridge-mautrix-whatsapp
+    - matrix-bridge-mautrix-discord
     - matrix-bridge-mx-puppet-discord
     - matrix-bridge-mx-puppet-groupme
     - matrix-bridge-mx-puppet-steam