Improve unzip_file function. Reduce cognitive complexity.

Removed all unspecified exceptions. Removed unneeded calls to other functions.
Reduced size of try catch blocks to just parts of code that could throw an error.

app/classes/helpers/file_helpers.py

@@ -13,6 +13,7 @@ import urllib.request
 import ssl
 import time
 import certifi
+from jsonschema.exceptions import ValidationError
 
 from app.classes.helpers.helpers import Helpers
 from app.classes.shared.console import Console
@@ -394,12 +395,26 @@ class FileHelpers:
         return True
 
     @staticmethod
-    def unzip_file(zip_path, server_update=False):
+    def unzip_file(zip_path, server_update: bool = False) -> None:
-        ignored_names = ["server.properties", "permissions.json", "allowlist.json"]
+        """
+        Unzips zip file at zip_path to location generated at new_dir based on zip
+        contents.
+
+        Args:
+            zip_path: Path to zip file to unzip.
+            server_update: Will skip ignored items list if not set to true. Used for
+            updating bedrock servers.
+
+        Returns: None
+
+        """
+        ignored_names: list = [
+            "server.properties",
+            "permissions.json",
+            "allowlist.json",
+        ]
         # Get directory without zipfile name
         new_dir = pathlib.Path(zip_path).parents[0]
-        # make sure we're able to access the zip file
-        if Helpers.check_file_perms(zip_path) and os.path.isfile(zip_path):
         # make sure the directory we're unzipping this to exists
         Helpers.ensure_dir_exists(new_dir)
         # we'll make a temporary directory to unzip this to.
@@ -408,12 +423,24 @@ class FileHelpers:
             with zipfile.ZipFile(zip_path, "r") as zip_ref:
                 # we'll extract this to the temp dir using zipfile module
                 zip_ref.extractall(temp_dir)
+        # Catch zipfile extract all error or file open errors.
+        except ValueError as why:
+            Console.error(f"Unzip failed with information: {why}")
+            raise RuntimeError(f"Unzip failed for path: {zip_path}") from why
+        except FileNotFoundError as why:
+            Console.error(f"Unzip failed file not found: {zip_path}")
+            raise FileNotFoundError(f"Unable to find file at path: {zip_path}") from why
+        except PermissionError as why:
+            Console.error(f"Bad permissions for file at: {zip_path}")
+            raise PermissionError(f"Bad permissions for file at: {zip_path}") from why
+
         # we'll iterate through the top level directory moving everything
         # out of the temp directory and into it's final home.
         for item in os.listdir(temp_dir):
             # if the file is one of our ignored names we'll skip it
             if item in ignored_names and server_update:
                 continue
+
             # we handle files and dirs differently or we'll crash out.
             if os.path.isdir(os.path.join(temp_dir, item)):
                 try:
@@ -421,7 +448,7 @@ class FileHelpers:
                         os.path.join(temp_dir, item),
                         os.path.join(new_dir, item),
                     )
-                        except Exception as ex:
+                except shutil.Error as ex:
                     logger.error(f"ERROR IN ZIP IMPORT: {ex}")
             else:
                 try:
@@ -429,13 +456,8 @@ class FileHelpers:
                         os.path.join(temp_dir, item),
                         os.path.join(new_dir, item),
                     )
-                        except Exception as ex:
+                except shutil.Error as ex:
                     logger.error(f"ERROR IN ZIP IMPORT: {ex}")
-            except Exception as ex:
-                Console.error(ex)
-        else:
-            return "false"
-        return
 
     def unzip_server(self, zip_path, user_id):
         if Helpers.check_file_perms(zip_path):

app/classes/web/routes/api/servers/server/files.py

@@ -565,7 +565,7 @@ class ApiServersServerFilesZipHandler(BaseApiHandler):
                 },
             )
         if Helpers.check_file_exists(folder):
-            folder = self.file_helper.unzip_file(folder, user_id)
+            self.file_helper.unzip_file(folder, user_id)
         else:
             if user_id:
                 return self.finish_json(