From 1df678fdf2565c9e06551cf2dfa535b403d8cfc4 Mon Sep 17 00:00:00 2001
From: Simon G <simon.gockner@gmail.com>
Date: Sun, 9 Feb 2020 00:34:26 +0100
Subject: [PATCH] - add server settings implementation

---
 GBase.Server/GBaseServerSettings.cs | 121 ++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 GBase.Server/GBaseServerSettings.cs

diff --git a/GBase.Server/GBaseServerSettings.cs b/GBase.Server/GBaseServerSettings.cs
new file mode 100644
index 0000000..2fe6cba
--- /dev/null
+++ b/GBase.Server/GBaseServerSettings.cs
@@ -0,0 +1,121 @@
+// Author: Simon Gockner
+// Created: 2020-02-08
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using GBase.Logging;
+using GBase.Server.Exceptions;
+using GBase.Server.Interfaces;
+
+namespace GBase.Server
+{
+    public class GBaseServerSettings : IGBaseServerSettings
+    {
+        private const string PROTOCOL_ARGUMENT_PREFIX = "-pr";
+        private const string IP_ADDRESS_ARGUMENT_PREFIX = "-ip";
+        private const string PORT_ARGUMENT_PREFIX = "-p";
+        private const string ENDPOINT_ARGUMENT_PREFIX = "-e";
+        private const string HELP_ARGUMENT_PREFIX = "-help";
+
+        private bool _protocolInitialized;
+        private bool _ipAddressInitialized;
+        private bool _portInitialized;
+        private bool _endpointInitialized;
+
+        public ServerProtocol Protocol { get; private set; }
+        public IPAddress IpAddress { get; private set; }
+        public int Port { get; private set; }
+        public string Endpoint { get; private set; }
+
+
+        public async Task ParseArguments(string[] args)
+        {
+            for (int index = 0; index < args.Length; index++)
+            {
+                if (args[index] == PROTOCOL_ARGUMENT_PREFIX)
+                {
+                    index++;
+                    await VerifyArgsLength(index, args.Length);
+
+                    Protocol = ServerProtocolExtensions.GetServerProtocolFromString(args[index]);
+                    _protocolInitialized = true;
+                }
+                else if (args[index] == IP_ADDRESS_ARGUMENT_PREFIX)
+                {
+                    index++;
+                    await VerifyArgsLength(index, args.Length);
+
+                    IpAddress = ParseIpAddress(args[index]);
+                    _ipAddressInitialized = true;
+                }
+                else if (args[index] == PORT_ARGUMENT_PREFIX)
+                {
+                    index++;
+                    await VerifyArgsLength(index, args.Length);
+
+                    Port = Convert.ToInt32(args[index]);
+                    _portInitialized = true;
+                }
+                else if (args[index] == ENDPOINT_ARGUMENT_PREFIX)
+                {
+                    index++;
+                    await VerifyArgsLength(index, args.Length);
+
+                    Endpoint = args[index];
+                    _endpointInitialized = true;
+                }
+                else
+                {
+                    await PrintHelp();
+                    throw new ArgumentOutOfRangeException(nameof(args), args[index], "Invalid argument.");
+                }
+            }
+
+            if (!await VerifySettings())
+                throw new IncompleteArgumentsException($"Not all mandatory arguments were passed. Check {HELP_ARGUMENT_PREFIX} to find out which arguments are mandatory.");
+        }
+
+        private async Task VerifyArgsLength(int index, int length)
+        {
+            if (length > index)
+                return;
+
+            await PrintHelp();
+            throw new MissingArgumentException(PROTOCOL_ARGUMENT_PREFIX);
+        }
+
+        private async Task<bool> VerifySettings()
+        {
+            if (_protocolInitialized && _ipAddressInitialized && _portInitialized && _endpointInitialized)
+                return true;
+
+            await PrintHelp();
+            return false;
+        }
+
+        private IPAddress ParseIpAddress(string ipAddressString)
+        {
+            string[] ipStringArray = ipAddressString.Split('.');
+            byte[] ipByteArray = new byte[ipStringArray.Length];
+
+            for (var i = 0; i < ipStringArray.Length; i++)
+            {
+                string @string = ipStringArray[i];
+                ipByteArray[i] = Convert.ToByte(@string);
+            }
+
+            return new IPAddress(ipByteArray);
+        }
+
+        private async Task PrintHelp()
+        {
+            await Log.Write<GBaseServerSettings>($"Mandatory Arguments:");
+            await Log.Write<GBaseServerSettings>($"{PROTOCOL_ARGUMENT_PREFIX}: The used protocol (e.g 'http' or 'https')");
+            await Log.Write<GBaseServerSettings>($"{IP_ADDRESS_ARGUMENT_PREFIX}: The used ip address");
+            await Log.Write<GBaseServerSettings>($"{PORT_ARGUMENT_PREFIX}: The used port");
+            await Log.Write<GBaseServerSettings>($"{Endpoint}: The used endpoint");
+        }
+    }
+}
\ No newline at end of file