fix: resolve all Ruff linting errors

- Fix PLW2901: Use different variable name for stripped lines in loop
- Fix E721: Use 'is' instead of '==' for type comparisons
- Add noqa comments for intentional security warnings (S321, S507, S110, S603)

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/tasks/upload_to_ftp.py

@@ -57,7 +57,7 @@ def upload_to_ftp(self, file_path: str, file_id: int = None):
         if use_tls:
             try:
                 logger.info(f"Attempting FTPS connection to {settings.ftp_host}")
-                ftp = ftplib.FTP_TLS()
+                ftp = ftplib.FTP_TLS()  # noqa: S321
                 ftp.connect(host=settings.ftp_host, port=settings.ftp_port or 21)
 
                 # Login with credentials
@@ -74,7 +74,7 @@ def upload_to_ftp(self, file_path: str, file_id: int = None):
                 else:
                     logger.warning(f"FTPS connection failed, falling back to regular FTP: {str(e)}")
                     # Fall back to regular FTP - only if explicitly allowed by configuration
-                    ftp = ftplib.FTP()  # nosec B321 - Fallback to FTP intentional when configured
+                    ftp = ftplib.FTP()  # nosec B321 - Fallback to FTP intentional when configured  # noqa: S321
                     ftp.connect(host=settings.ftp_host, port=settings.ftp_port or 21)
 
                     # Login with credentials
@@ -88,7 +88,7 @@ def upload_to_ftp(self, file_path: str, file_id: int = None):
 
             # Directly use regular FTP if TLS is explicitly disabled
             logger.warning("Using plaintext FTP - connection is NOT encrypted!")
-            ftp = ftplib.FTP()  # nosec B321 - Plaintext FTP intentional when explicitly configured
+            ftp = ftplib.FTP()  # nosec B321 - Plaintext FTP intentional when explicitly configured  # noqa: S321
             ftp.connect(host=settings.ftp_host, port=settings.ftp_port or 21)
 
             # Login with credentials

app/tasks/upload_to_sftp.py

@@ -56,7 +56,7 @@ def upload_to_sftp(self, file_path: str, file_id: int = None):
             "This should only be used in development/testing. For production, remove "
             "SFTP_DISABLE_HOST_KEY_VERIFICATION or set it to False and configure known_hosts."
         )
-        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())  # nosec B507 - Configurable, warns user
+        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())  # nosec B507 - Configurable, warns user  # noqa: S507
     else:
         # Use system known_hosts for host key verification (more secure)
         ssh.load_system_host_keys()
@@ -149,8 +149,8 @@ def upload_to_sftp(self, file_path: str, file_id: int = None):
             if "sftp" in locals():
                 sftp.close()
             ssh.close()
-        except Exception:
-            pass
+        except Exception:  # noqa: S110
+            pass  # Ignore errors during cleanup
 
         error_msg = f"Failed to upload {filename} to SFTP server: {str(e)}"
         logger.error(f"[{task_id}] {error_msg}")

app/tasks/upload_with_rclone.py

@@ -57,7 +57,7 @@ def upload_with_rclone(self, file_path: str, destination: str):
         # Ensure the remote path exists (create folders if needed)
         mkdir_cmd = ["rclone", "mkdir", "--config", rclone_config_path, destination]
 
-        subprocess.run(mkdir_cmd, check=True, capture_output=True)
+        subprocess.run(mkdir_cmd, check=True, capture_output=True)  # noqa: S603
 
         # Construct the upload command
         upload_cmd = ["rclone", "copy", "--config", rclone_config_path, file_path, destination, "--progress"]
@@ -65,14 +65,14 @@ def upload_with_rclone(self, file_path: str, destination: str):
         log_task_progress(task_id, "rclone_upload", "in_progress", f"Executing rclone copy to {destination}")
 
         # Execute the upload command
-        result = subprocess.run(upload_cmd, check=True, capture_output=True, text=True)
+        result = subprocess.run(upload_cmd, check=True, capture_output=True, text=True)  # noqa: S603
 
         # Check if upload was successful
         if result.returncode == 0:
             # Try to get a public link if possible
             try:
                 link_cmd = ["rclone", "link", "--config", rclone_config_path, f"{destination}/{filename}"]
-                link_result = subprocess.run(link_cmd, capture_output=True, text=True, check=False)
+                link_result = subprocess.run(link_cmd, capture_output=True, text=True, check=False)  # noqa: S603
                 public_url = link_result.stdout.strip() if link_result.returncode == 0 else None
             except (subprocess.SubprocessError, OSError) as e:
                 logger.warning(f"[{task_id}] Failed to get public link for {filename}: {str(e)}")
@@ -135,7 +135,7 @@ def send_to_all_rclone_destinations(self, file_path: str):
     # Get list of configured destinations from rclone
     try:
         remotes_cmd = ["rclone", "listremotes", "--config", rclone_config_path]
-        result = subprocess.run(remotes_cmd, check=True, capture_output=True, text=True)
+        result = subprocess.run(remotes_cmd, check=True, capture_output=True, text=True)  # noqa: S603
 
         if result.returncode == 0:
             # Process the list of remotes