refactor: Check for valid port and address in run_server (grapheneX#178)

* add helper functions

* refactor run_server

* add missing docstring

* simplify is_valid_port func

graphenex/core/utils/helpers.py

@@ -2,6 +2,7 @@
 import sys
 import json
 import ctypes
+import socket
 import pathlib
 import argparse
 from colorama import init, Fore, Style
@@ -160,3 +161,19 @@ def get_mod_json():
     except FileNotFoundError:
         logger.error(f"{mod_json_file} not found! Exiting grapheneX.")
         sys.exit(1)
+
+
+def is_valid_port(port):
+    """Verify the port number"""
+
+    return 1 <= port <= 65535
+
+
+def is_valid_address(address):
+    """Verify the IP address"""
+
+    try:
+        socket.getaddrinfo(address, None)
+        return True
+    except socket.gaierror:
+        return False

graphenex/core/web/__init__.py

@@ -6,6 +6,7 @@
 from flask import Flask
 from flask_socketio import SocketIO
 
+from graphenex.core.utils.helpers import is_valid_port, is_valid_address
 from graphenex.core.cli.shell import Shell
 from graphenex.core.utils.logcl import GraphenexLogger
 
@@ -24,30 +25,42 @@
 def run_server(args=None, exit_shell=True):
     """Run the web server"""
 
+    if args:
+        server_params = args.get('host_port', '').split(':') or default_addr
+    else:
+        server_params = default_addr
+
+    try:
+        server_addr, server_port = server_params
+        server_port = int(server_port)
+    except (ValueError, IndexError):
+        logger.error(f"Invalid server parameters: {server_params}")
+        return
+
+    if not is_valid_port(server_port):
+        logger.error(f"Invalid port specified: {server_port}")
+        return
+
+    if not is_valid_address(server_addr):
+        logger.error(f"Invalid address specified: {server_addr}")
+        return
+
+    logger.info(f"Starting server on http://{server_addr}:{server_port}")
+
     try:
-        if args:
-            server_params = args['host_port'].split(':') \
-                if ':' in args['host_port'] \
-                else (args['host_port'], '8080')
-        else:
-            server_params = default_addr
-        logger.info(f"Starting server: http://{server_params[0]}:{server_params[1]}")
-        try:
-            if args and args['open']:
-                webbrowser.open(f"http://{server_params[0]}:{server_params[1]}")
-        except Exception:
-            pass
+        if args and args.get('open', False):
+            webbrowser.open(f"http://{server_addr}:{server_port}")
+
         logger.info(f"Your access token: {app.config['ACCESS_TOKEN']}")
-        socketio.run(app, host=server_params[0], port=int(server_params[1]), debug=False)
-    except (PermissionError, ValueError):
-        logger.error('Invalid host & port address. Restarting with default host and port.')
-        run_server()
+        socketio.run(app, host=server_addr, port=server_port, debug=False)
+    except socket.error as e:
+        if e.errno == 98:
+            logger.error(f"{server_addr}:{server_port} is already in use!")
+            return
     except KeyboardInterrupt:
         socketio.stop()
         if exit_shell:
             Shell().do_exit(None)
-    except socket.error as e:
-        if e.errno == 98:
-            logger.error(f"{server_params[0]}:{server_params[1]} is already in use!")
     except Exception as e:
         logger.error(f'An error occurred: {e}')
+        return