Enhance error handling in Auth class for token and ID file retrieval

- Added checks to ensure the existence and non-emptiness of the token and ID files in the Auth class. This improvement raises appropriate exceptions with clear error messages when the files are missing or empty, enhancing robustness and debugging capabilities.

Author: Nikolai Lambrov

frameworks/jenkins/auth/auth.py

@@ -11,7 +11,17 @@ def __init__(self, id: str = None, token: str = None):
         self.token = token or self._get_token()
 
     def _get_token(self) -> str:
-        return self.TOKEN_FILE.read_text().strip()
+        if not self.TOKEN_FILE.is_file():
+            raise FileNotFoundError(f"|ERROR| Token file not found: {self.TOKEN_FILE}")
+        token = self.TOKEN_FILE.read_text().strip()
+        if not token:
+            raise ValueError(f"|ERROR| Token file is empty: {self.TOKEN_FILE}")
+        return token
 
     def _get_id(self) -> str:
-        return self.ID_FILE.read_text().strip()
+        if not self.ID_FILE.is_file():
+            raise FileNotFoundError(f"|ERROR| ID file not found: {self.ID_FILE}")
+        id = self.ID_FILE.read_text().strip()
+        if not id:
+            raise ValueError(f"|ERROR| ID file is empty: {self.ID_FILE}")
+        return id