add xml config generator for radarr

This is cool but also needed because we now must set the authentication method to "External" for
radarr to be happy with our SSO integration.

README.md

@@ -67,6 +67,7 @@ Currently supported services and features are:
   - [ ] Export metrics to Prometheus.
 - [X] VPN tunnel
 - [X] Arr suite
+  - [X] SSO auth (one account for all users).
   - [X] VPN support.
 - [X] Mount webdav folders
 - [ ] Gitea to deploy

modules/arr.nix

@@ -5,7 +5,25 @@ let
 
   apps = {
     radarr = {
-      defaultPort = 7878;
+      defaultPort = 7001;
+      settingsFormat = formatXML {};
+      moreOptions = {
+        settings = lib.mkOption {
+          default = {};
+          type = lib.types.submodule {
+            freeformType = apps.radarr.settingsFormat.type;
+            options = {
+              APIKeyFile = lib.mkOption {
+                type = lib.types.path;
+              };
+              LogLevel = lib.mkOption {
+                type = lib.types.enum ["debug" "info"];
+                default = "info";
+              };
+            };
+          };
+        };
+      };
     };
     sonarr = {
       defaultPort = 8989;
@@ -59,12 +77,47 @@ let
               };
             };
           };
-          default = {};
         };
       };
     };
   };
 
+  formatXML = {}: {
+    type = with lib.types; let
+      valueType = nullOr (oneOf [
+        bool
+        int
+        float
+        str
+        path
+        (attrsOf valueType)
+        (listOf valueType)
+      ]) // {
+        description = "XML value";
+      };
+    in valueType;
+
+    generate = name: value: pkgs.callPackage ({ runCommand, python3 }: runCommand name {
+      value = builtins.toJSON {Config = value;};
+      passAsFile = [ "value" ];
+    } (pkgs.writers.writePython3 "dict2xml" {
+      libraries = with python3.pkgs; [ python dict2xml ];
+    } ''
+      import os
+      import json
+      from dict2xml import dict2xml
+
+      with open(os.environ["valuePath"]) as f:
+          content = json.loads(f.read())
+          if content is None:
+              print("Could not parse env var valuePath as json")
+              os.exit(2)
+          with open(os.environ["out"], "w") as out:
+              out.write(dict2xml(content))
+    '')) {};
+
+  };
+
   appOption = name: c: lib.nameValuePair name (lib.mkOption {
     description = "Configuration for ${name}";
     default = {};
@@ -123,7 +176,6 @@ in
 
   config = lib.mkMerge ([
     {
-      # Listens on port 7878
       services.radarr = lib.mkIf cfg.radarr.enable {
         enable = true;
         dataDir = "/var/lib/radarr";
@@ -131,6 +183,31 @@ in
       users.users.radarr = lib.mkIf cfg.radarr.enable {
         extraGroups = [ "media" ];
       };
+      shb.arr.radarr.settings = lib.mkIf cfg.radarr.enable {
+        Port = config.shb.arr.radarr.port;
+        BindAddress = "127.0.0.1";
+        UrlBase = "";
+        EnableSsl = "false";
+        AuthenticationMethod = "External";
+        AuthenticationRequired = "Enabled";
+      };
+      systemd.services.radarr.preStart =
+        let
+          s = cfg.radarr.settings;
+          templatedfileSettings =
+            lib.optionalAttrs (!(isNull s.APIKeyFile)) {
+              ApiKey = "%APIKEY%";
+            };
+          templatedSettings = (removeAttrs s [ "APIKeyFile" ]) // templatedfileSettings;
+
+          t = template (apps.radarr.settingsFormat.generate "
+config.xml" templatedSettings) "${config.services.radarr.dataDir}/config.xml" (
+            lib.optionalAttrs (!(isNull s.APIKeyFile)) {
+              "%APIKEY%" = "$(cat ${s.APIKeyFile})";
+            }
+          );
+        in
+          lib.mkIf cfg.radarr.enable t;
 
       # Listens on port 8989
       services.sonarr = lib.mkIf cfg.sonarr.enable {