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|
{ config, pkgs, lib, ... }:
with lib;
let
dataDir = "/var/lib/mautrix-discord";
registrationFile = "${dataDir}/discord-registration.yaml";
cfg = config.services.mautrix-discord;
settingsFormat = pkgs.formats.json { };
settingsFile = "${dataDir}/config.json";
settingsFileUnsubstituted = settingsFormat.generate "mautrix-discord-config.json" cfg.settings;
in
{
options = {
services.mautrix-discord = {
enable = mkEnableOption (lib.mdDoc "Mautrix-discord, a Matrix-discord puppeting bridge.");
package = mkOption { type = types.package; default = pkgs.mautrix-discord; };
settings = mkOption rec {
apply = recursiveUpdate default;
inherit (settingsFormat) type;
default = {
homeserver = {
software = "standard";
};
appservice = rec {
database = "sqlite:///${dataDir}/mautrix-discord.db";
database_opts = { };
hostname = "localhost";
port = 8080;
address = "http://localhost:${toString port}";
};
bridge = {
permissions."*" = "relay";
relay.whitelist = [ ];
double_puppet_server_map = { };
login_shared_secret_map = { };
};
logging = {
min_level = "debug";
writers = [
{
type = "stdout";
format = "pretty-colored";
}
];
};
};
example = literalExpression ''
{
homeserver = {
address = "http://localhost:8008";
domain = "public-domain.tld";
};
appservice.public = {
prefix = "/public";
external = "https://public-appservice-address/public";
};
bridge.permissions = {
"example.com" = "full";
"@admin:example.com" = "admin";
};
}
'';
description = lib.mdDoc ''
{file}`config.yaml` configuration as a Nix attribute set.
Configuration options should match those described in
[example-config.yaml](https://github.com/mautrix/discord/blob/master/discord/example-config.yaml).
Secret tokens should be specified using {option}`environmentFile`
instead of this world-readable attribute set.
'';
};
environmentFile = mkOption {
type = types.nullOr types.path;
default = null;
description = lib.mdDoc ''
File containing environment variables to be passed to the mautrix-discord service,
in which secret tokens can be specified securely by defining values for e.g.
`MAUTRIX_DISCORD_APPSERVICE_AS_TOKEN`,
`MAUTRIX_DISCORD_APPSERVICE_HS_TOKEN`,
These environment variables can also be used to set other options by
replacing hierarchy levels by `.`, converting the name to uppercase
and prepending `MAUTRIX_DISCORD_`.
For example, the first value above maps to
{option}`settings.appservice.as_token`.
The environment variable values can be prefixed with `json::` to have
them be parsed as JSON. For example, `login_shared_secret_map` can be
set as follows:
`MAUTRIX_DISCORD_BRIDGE_LOGIN_SHARED_SECRET_MAP=json::{"example.com":"secret"}`.
'';
};
serviceDependencies = mkOption {
type = with types; listOf str;
default = optional config.services.matrix-synapse.enable "matrix-synapse.service";
defaultText = literalExpression ''
optional config.services.matrix-synapse.enable "matrix-synapse.service"
'';
description = lib.mdDoc ''
List of Systemd services to require and wait for when starting the application service.
'';
};
};
};
config = mkIf cfg.enable {
users.users.mautrix-discord = {
isSystemUser = true;
group = "mautrix-discord";
home = dataDir;
description = "Mautrix-Discord bridge user";
};
users.groups.mautrix-discord = {};
systemd.services.mautrix-discord = {
description = "Mautrix-discord, a Matrix-discord puppeting bridge.";
wantedBy = [ "multi-user.target" ];
wants = [ "network-online.target" ] ++ cfg.serviceDependencies;
after = [ "network-online.target" ] ++ cfg.serviceDependencies;
preStart = ''
# substitute the settings file by environment variables
# in this case read from EnvironmentFile
test -f '${settingsFile}' && rm -f '${settingsFile}'
old_umask=$(umask)
umask 0177
${pkgs.envsubst}/bin/envsubst \
-o '${settingsFile}' \
-i '${settingsFileUnsubstituted}' \
umask $old_umask
# generate the appservice's registration file if absent
if [ ! -f '${registrationFile}' ]; then
${pkgs.mautrix-discord}/bin/mautrix-discord \
--generate-registration \
--config='${settingsFile}' \
--registration='${registrationFile}'
fi
chmod 640 ${registrationFile}
umask 0177
${pkgs.yq}/bin/yq -s '.[0].appservice.as_token = .[1].as_token
| .[0].appservice.hs_token = .[1].hs_token
| .[0]' '${settingsFile}' '${registrationFile}' \
> '${settingsFile}.tmp'
mv '${settingsFile}.tmp' '${settingsFile}'
umask $old_umask
'';
serviceConfig = {
Type = "simple";
Restart = "on-failure";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
ProtectSystem = "strict";
ProtectHome = true;
ProtectKernelTunables = true;
ProtectKernelModules = true;
ProtectKernelLogs = true;
ProtectControlGroups = true;
ProtectClock = true;
ProtectHostname = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallErrorNumber = "EPERM";
SystemCallFilter = ["@system-service"];
PrivateTmp = true;
PrivateDevices = true;
PrivateUsers = true;
User = "mautrix-discord";
Group = "mautrix-discord";
WorkingDirectory = dataDir;
StateDirectory = baseNameOf dataDir;
UMask = "0027";
EnvironmentFile = cfg.environmentFile;
ExecStart = ''
${cfg.package}/bin/mautrix-discord \
--config='${settingsFile}' \
--registration='${registrationFile}'
'';
};
restartTriggers = [settingsFileUnsubstituted];
};
};
}
|
