use xml and yaml libraries

module.nix

@@ -332,6 +332,7 @@ let
   pythonEnv = pkgs.python3.withPackages (
     ps: with ps; [
       pyarr
+      pyyaml
       requests
     ]
   );
@@ -390,9 +391,9 @@ let
 
       import json
       import os
-      import re
       import sys
       import time
+      import xml.etree.ElementTree as ET
 
       import requests as http
       from pyarr import SonarrAPI
@@ -410,12 +411,11 @@ let
 
       def read_api_key(config_xml_path):
           """Extract <ApiKey> from a Servarr config.xml file."""
-          with open(config_xml_path) as fh:
-              content = fh.read()
-          match = re.search(r"<ApiKey>([^<]+)</ApiKey>", content)
-          if not match:
+          tree = ET.parse(config_xml_path)
+          node = tree.find("ApiKey")
+          if node is None or not node.text:
               raise ValueError(f"Could not find ApiKey in {config_xml_path}")
-          return match.group(1)
+          return node.text
 
 
       def wait_for_api(base_url, api_key, timeout, name):
@@ -793,11 +793,12 @@ let
 
     import json
     import os
-    import re
     import sys
     import time
+    import xml.etree.ElementTree as ET
 
     import requests as http
+    import yaml
 
     CONFIG = json.loads(${builtins.toJSON mkBazarrInitConfig})
 
@@ -805,23 +806,22 @@ let
     def read_api_key_yaml(config_yaml_path):
         """Extract the apikey from Bazarr's config.yaml (auth section)."""
         with open(config_yaml_path) as fh:
-            in_auth = False
-            for line in fh:
-                if line.strip().startswith("auth:"):
-                    in_auth = True
-                elif in_auth and "apikey:" in line:
-                    return line.split("apikey:")[-1].strip()
-        raise ValueError(f"Could not find apikey in {config_yaml_path}")
+            data = yaml.safe_load(fh)
+        try:
+            return data["auth"]["apikey"]
+        except (KeyError, TypeError) as exc:
+            raise ValueError(
+                f"Could not find auth.apikey in {config_yaml_path}"
+            ) from exc
 
 
     def read_api_key_xml(config_xml_path):
         """Extract <ApiKey> from a Servarr config.xml file."""
-        with open(config_xml_path) as fh:
-            content = fh.read()
-        match = re.search(r"<ApiKey>([^<]+)</ApiKey>", content)
-        if not match:
+        tree = ET.parse(config_xml_path)
+        node = tree.find("ApiKey")
+        if node is None or not node.text:
             raise ValueError(f"Could not find ApiKey in {config_xml_path}")
-        return match.group(1)
+        return node.text
 
 
     def wait_for_api(base_url, api_key, timeout):