nixos/fastapi-dls: init

nixos/modules/module-list.nix

@@ -759,6 +759,7 @@
   ./services/misc/etesync-dav.nix
   ./services/misc/evdevremapkeys.nix
   ./services/misc/evremap.nix
+  ./services/misc/fastapi-dls.nix
   ./services/misc/felix.nix
   ./services/misc/flaresolverr.nix
   ./services/misc/forgejo.nix

nixos/modules/services/misc/fastapi-dls.nix

@@ -0,0 +1,133 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.services.fastapi-dls;
+  stateDir = "/var/lib/fastapi-dls";
+  dls_privkey = "${stateDir}/instance.private.pem";
+  dls_pubkey = "${stateDir}/instance.public.pem";
+  https_privkey = "${stateDir}/webserver.key";
+  https_cert = "${stateDir}/webserver.crt";
+in
+{
+  ##### interface
+  options = {
+    services.fastapi-dls = {
+      enable = lib.mkEnableOption "fastapi-dls";
+
+      package = lib.mkOption {
+        type = lib.types.package;
+        default = pkgs.fastapi-dls;
+        defaultText = lib.literalExpression "pkgs.fastapi-dls";
+        description = "Which package to use for the fastapi-dls daemon.";
+      };
+
+      listenAddress = lib.mkOption {
+        type = lib.types.str;
+        default = "127.0.0.1";
+        description = "The IP address on which `fastapi-dls` listens.";
+      };
+
+      listenPort = lib.mkOption {
+        type = lib.types.port;
+        default = 443;
+        description = "The port on which `fastapi-dls` listens.";
+      };
+
+      dlsAddress = lib.mkOption {
+        type = lib.types.str;
+        default = cfg.listenAddress;
+        defaultText = lib.literalExpression "services.fastapi-dls.listenAddress";
+        description = ''
+          The HTTPS domain name that DLS clients should connect to.
+          Useful when you put `fastapi-dls` behind a reverse proxy.
+        '';
+      };
+
+      dlsPort = lib.mkOption {
+        type = lib.types.port;
+        default = cfg.listenPort;
+        defaultText = lib.literalExpression "services.fastapi-dls.listenPort";
+        description = "The port that DLS clients should connect to.";
+      };
+
+      openFirewall = lib.mkEnableOption "opening the firewall for `fastapi-dls`";
+    };
+  };
+
+  ##### implementation
+  config =
+    let
+      envFile = pkgs.writeText "fastapi-dls.env" ''
+        # Toggle debug mode
+        #DEBUG=false
+
+        # Where the client can find the DLS server
+        DLS_URL=${cfg.dlsAddress}
+        DLS_PORT=${builtins.toString cfg.dlsPort}
+
+        # CORS configuration
+        ## comma separated list without spaces
+        #CORS_ORIGINS="https://${cfg.dlsAddress}:${builtins.toString cfg.dlsPort}"
+
+        # Lease expiration in days
+        LEASE_EXPIRE_DAYS=90
+        LEASE_RENEWAL_PERIOD=0.2
+
+        # Database location
+        ## https://docs.sqlalchemy.org/en/14/core/engines.html
+        DATABASE=sqlite:///${stateDir}/db.sqlite
+
+        # UUIDs for identifying the instance
+        #SITE_KEY_XID="00000000-0000-0000-0000-000000000000"
+        #INSTANCE_REF="10000000-0000-0000-0000-000000000001"
+        #ALLOTMENT_REF="20000000-0000-0000-0000-000000000001"
+
+        # Site-wide signing keys
+        INSTANCE_KEY_RSA=${dls_privkey}
+        INSTANCE_KEY_PUB=${dls_pubkey}
+      '';
+    in
+    lib.mkIf cfg.enable {
+      networking.firewall = lib.mkIf cfg.openFirewall {
+        allowedTCPPorts = [ cfg.listenPort ];
+      };
+
+      systemd.services.fastapi-dls = {
+        description = "fastapi-dls daemon";
+        wantedBy = [ "multi-user.target" ];
+        wants = [ "network-online.target" ];
+        after = [ "network-online.target" ];
+        preStart = ''
+          if [ ! -f "${dls_privkey}" ]; then
+            ${pkgs.openssl}/bin/openssl genrsa -out "${dls_privkey}" 2048
+          fi
+          if [ ! -f "${dls_pubkey}" ]; then
+            ${pkgs.openssl}/bin/openssl rsa -in "${dls_privkey}" -outform PEM -pubout -out "${dls_pubkey}"
+          fi
+          if [ ! -f "${https_privkey}" ] || [ ! -f "${https_cert}" ]; then
+            ${pkgs.openssl}/bin/openssl req -x509 -nodes \
+              -days 3650 -newkey rsa:2048 -subj "/CN=fastapi-dls" \
+              -keyout "${https_privkey}" -out "${https_cert}"
+          fi
+        '';
+        script = ''
+          ${lib.getExe cfg.package} \
+            --env-file ${envFile} \
+            --host ${cfg.listenAddress} \
+            --port ${builtins.toString cfg.listenPort} \
+            --ssl-keyfile ${https_privkey} \
+            --ssl-certfile ${https_cert}
+        '';
+        serviceConfig = {
+          DynamicUser = true;
+          StateDirectory = builtins.baseNameOf stateDir;
+        };
+      };
+    };
+
+  meta.maintainers = with lib.maintainers; [ makisekurisu ];
+}