Add Pantalaimon support

This is actually authored by Julian Foad here
(https://lab.trax.im/matrix/matrix-docker-ansible-deploy), but was in
need of a rebase and various adjustments caused by huge playbook
refactoring that landed in the past months.

This rework is completely untested.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/266

docs/configuring-playbook-bot-draupnir.md

@@ -43,14 +43,57 @@ The following command works on semi up to date Windows 10 installs and All Windo
 
 ## 4. Create a management room
 
-Using your own account, create a new invite only room that you will use to manage the bot. This is the room where you will see the status of the bot and where you will send commands to the bot, such as the command to ban a user from another room. Anyone in this room can control the bot so it is important that you only invite trusted users to this room. The room must be unencrypted since the playbook does not support installing Pantalaimon yet.
+Using your own account, create a new invite only room that you will use to manage the bot. This is the room where you will see the status of the bot and where you will send commands to the bot, such as the command to ban a user from another room. Anyone in this room can control the bot so it is important that you only invite trusted users to this room.
+
+If you make the management room encrypted (E2EE), then you MUST enable and use Pantalaimon (see below).
 
 Once you have created the room you need to copy the room ID so you can tell the bot to use that room. In Element you can do this by going to the room's settings, clicking Advanced, and then coping the internal room ID. The room ID will look something like `!QvgVuKq0ha8glOLGMG:DOMAIN`.
 
 Finally invite the `@bot.draupnir:DOMAIN` account you created earlier into the room.
 
 
-## 5a. Adjusting the playbook configuration
+## 5. Adjusting the playbook configuration
+
+Decide whether you want Draupnir to be capable of operating in end-to-end encrypted (E2EE) rooms. This includes the management room and the moderated rooms. To support E2EE, Draupnir needs to [use Pantalaimon](configuring-playbook-pantalaimon.md).
+
+### 5a. Configuration with E2EE support
+
+When using Pantalaimon, Draupnir will log in to its bot account itself through Pantalaimon, so configure its username and password.
+
+Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file (adapt to your needs):
+
+```yaml
+# Enable Pantalaimon. See docs/configuring-playbook-pantalaimon.md
+matrix_pantalaimon_enabled: true
+
+# Enable Draupnir
+matrix_bot_draupnir_enabled: true
+
+# Tell Draupnir to use Pantalaimon
+matrix_bot_draupnir_pantalaimon_use: true
+
+# User name and password for the bot. Required when using Pantalaimon.
+matrix_bot_draupnir_pantalaimon_username: "bot.draupnir"
+matrix_bot_draupnir_pantalaimon_password: ### you should create a secure password for the bot account
+
+matrix_bot_draupnir_management_room: "ROOM_ID_FROM_STEP_4_GOES_HERE"
+```
+
+The playbook's `group_vars` will configure other required settings. If using this role separately without the playbook, you also need to configure the two URLs that Draupnir uses to reach the homeserver, one through Pantalaimon and one "raw". This example is taken from the playbook's `group_vars`:
+
+```yaml
+# Endpoint URL that Draupnir uses to interact with the matrix homeserver (client-server API).
+# Set this to the pantalaimon URL if you're using that.
+matrix_bot_draupnir_homeserver_url: "{{ 'http://matrix-pantalaimon:8009' if matrix_bot_draupnir_pantalaimon_use else matrix_addons_homeserver_client_api_url }}"
+
+# Endpoint URL that Draupnir could use to fetch events related to reports (client-server API and /_synapse/),
+# only set this to the public-internet homeserver client API URL, do NOT set this to the pantalaimon URL.
+matrix_bot_draupnir_raw_homeserver_url: "{{ matrix_addons_homeserver_client_api_url }}"
+```
+
+### 5b. Configuration without E2EE support
+
+When NOT using Pantalaimon, Draupnir does not log in by itself and you must give it an access token for its bot account.
 
 Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file (adapt to your needs):
 
@@ -64,7 +107,7 @@ matrix_bot_draupnir_access_token: "ACCESS_TOKEN_FROM_STEP_2_GOES_HERE"
 matrix_bot_draupnir_management_room: "ROOM_ID_FROM_STEP_4_GOES_HERE"
 ```
 
-## 5b. Migrating from Mjolnir (Only required if migrating.)
+### 5c. Migrating from Mjolnir (Only required if migrating.)
 
 Replace your `matrix_bot_mjolnir` config with `matrix_bot_draupnir` config. Also disable mjolnir if you're doing migration.
 That is all you need to do due to that Draupnir can complete migration on its own.

docs/configuring-playbook-bot-mjolnir.md

@@ -37,7 +37,7 @@ The following command works on semi up to date Windows 10 installs and All Windo
 
 ## 4. Create a management room
 
-Using your own account, create a new invite only room that you will use to manage the bot. This is the room where you will see the status of the bot and where you will send commands to the bot, such as the command to ban a user from another room. Anyone in this room can control the bot so it is important that you only invite trusted users to this room. The room must be unencrypted since the playbook does not support installing Pantalaimon yet.
+Using your own account, create a new invite only room that you will use to manage the bot. This is the room where you will see the status of the bot and where you will send commands to the bot, such as the command to ban a user from another room. Anyone in this room can control the bot so it is important that you only invite trusted users to this room. The room must be unencrypted since this role does not support [using Pantalaimon](configuring-playbook-pantalaimon.md) yet.
 
 Once you have created the room you need to copy the room ID so you can tell the bot to use that room. In Element you can do this by going to the room's settings, clicking Advanced, and then coping the internal room ID. The room ID will look something like `!QvgVuKq0ha8glOLGMG:DOMAIN`.
 

docs/configuring-playbook-pantalaimon.md

@@ -0,0 +1,21 @@
+# Setting up pantalaimon (optional)
+
+The playbook can install and configure the [pantalaimon](https://github.com/matrix-org/pantalaimon) E2EE aware proxy daemon for you.
+
+See the project's [documentation](https://github.com/matrix-org/pantalaimon) to learn what it does and why it might be useful to you.
+
+This role exposes Pantalaimon's API only within the container network, so bots and clients installed on the same machine can use it. In particular the [matrix-bot-draupnir](configuring-playbook-bot-draupnir.md) role and possibly others can use it.
+
+## 1. Adjusting the playbook configuration
+
+Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file (adapt to your needs):
+
+```yaml
+matrix_pantalaimon_enabled: true
+```
+
+The default configuration should suffice. For advanced configuration, you can override the variables documented in the role's [defaults](../roles/custom/matrix-pantalaimon/defaults/main.yml).
+
+## 2. Installing
+
+After configuring the playbook, run the [installation](installing.md) command.

docs/configuring-playbook.md

@@ -105,7 +105,9 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 - [Setting up Matrix Corporal](configuring-playbook-matrix-corporal.md) (optional, advanced)
 
-- [Matrix User Verification Service](configuring-playbook-user-verification-service.md) (optional, advanced)
+- [Setting up Matrix User Verification Service](configuring-playbook-user-verification-service.md) (optional, advanced)
+
+- [Setting up Pantalaimon (E2EE aware proxy daemon)](configuring-playbook-pantalaimon.md) (optional, advanced)
 
 
 ### Bridging other networks

docs/self-building.md

@@ -40,6 +40,7 @@ Possibly outdated list of roles where self-building the Docker image is currentl
 - `matrix-bot-matrix-reminder-bot`
 - `matrix-bot-maubot`
 - `matrix-email2matrix`
+- `matrix-pantalaimon`
 
 Adding self-building support to other roles is welcome. Feel free to contribute!