From 071ced5be2bbb0c29c4ceb4e5757edf416231550 Mon Sep 17 00:00:00 2001
From: vijayshinva <vijayshinva>
Date: Tue, 17 Nov 2020 13:53:40 +0530
Subject: [PATCH] Base64Url

---
 Kryptos/Kryptos/Base64Url.cs                 |  38 +++++++
 Kryptos/Kryptos/Kryptos.csproj               |   4 +-
 Kryptos/Kryptos/Program.cs                   |   1 +
 Kryptos/Kryptos/WireUpBase64UrlExtensions.cs | 110 +++++++++++++++++++
 Kryptos/Kryptos/WireUpUuidExtensions.cs      |   3 -
 5 files changed, 151 insertions(+), 5 deletions(-)
 create mode 100644 Kryptos/Kryptos/Base64Url.cs
 create mode 100644 Kryptos/Kryptos/WireUpBase64UrlExtensions.cs

diff --git a/Kryptos/Kryptos/Base64Url.cs b/Kryptos/Kryptos/Base64Url.cs
new file mode 100644
index 0000000..21d036e
--- /dev/null
+++ b/Kryptos/Kryptos/Base64Url.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+namespace Kryptos
+{
+    public class Base64Url
+    {
+        private static readonly char base64PadCharacter = '=';
+        private static readonly string doubleBase64PadCharacter = "==";
+        private static readonly char base64Character62 = '+';
+        private static readonly char base64Character63 = '/';
+        private static readonly char base64UrlCharacter62 = '-';
+        private static readonly char base64UrlCharacter63 = '_';
+        public static string Encode(string text)
+        {
+            return Convert.ToBase64String(Encoding.UTF8.GetBytes(text))
+                .Split(base64PadCharacter)[0]
+                .Replace(base64Character62, base64UrlCharacter62)
+                .Replace(base64Character63, base64UrlCharacter63);
+        }
+        public static string Decode(string text)
+        {
+            text = text.Replace(base64UrlCharacter62, base64Character62)
+                .Replace(base64UrlCharacter63, base64Character63);
+            
+            text += (text.Length % 4) switch
+            {
+                2 => doubleBase64PadCharacter,
+                3 => base64PadCharacter,
+                _ => throw new FormatException("Base64Url encoded string is not good."),
+            };
+
+            return Encoding.UTF8.GetString(Convert.FromBase64String(text));
+        }
+    }
+}
diff --git a/Kryptos/Kryptos/Kryptos.csproj b/Kryptos/Kryptos/Kryptos.csproj
index be1f543..b95b8fa 100644
--- a/Kryptos/Kryptos/Kryptos.csproj
+++ b/Kryptos/Kryptos/Kryptos.csproj
@@ -3,10 +3,10 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>0.0.2</Version>
+    <Version>0.0.3</Version>
     <Authors>Vijayshinva Karnure</Authors>
     <Description>A .NET core tool for cryptography.</Description>
-    <Copyright>(c) 2020 Vijayshinva Karnure</Copyright>
+    <Copyright>2020 Vijayshinva Karnure</Copyright>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/vijayshinva/kryptos</PackageProjectUrl>
     <RepositoryUrl>https://github.com/vijayshinva/kryptos</RepositoryUrl>
diff --git a/Kryptos/Kryptos/Program.cs b/Kryptos/Kryptos/Program.cs
index 420e6cd..89e38f3 100644
--- a/Kryptos/Kryptos/Program.cs
+++ b/Kryptos/Kryptos/Program.cs
@@ -15,6 +15,7 @@ static async Task<int> Main(string[] args)
 
             rootCommand.WireUpUuidCommands()
                 .WireUpBase64Commands()
+                .WireUpBase64UrlCommands()
                 .WireUpMd5Commands()
                 .WireUpSha1Commands()
                 .WireUpSha256Commands()
diff --git a/Kryptos/Kryptos/WireUpBase64UrlExtensions.cs b/Kryptos/Kryptos/WireUpBase64UrlExtensions.cs
new file mode 100644
index 0000000..07050aa
--- /dev/null
+++ b/Kryptos/Kryptos/WireUpBase64UrlExtensions.cs
@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.CommandLine;
+using System.CommandLine.Invocation;
+using System.CommandLine.IO;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Kryptos
+{
+    public static class WireUpBase64UrlExtensions
+    {
+        public static RootCommand WireUpBase64UrlCommands(this RootCommand rootCommand)
+        {
+            var base64UrlCommand = new Command("base64url", "Base64 URL");
+            var base64UrlEncCommand = new Command("encode", "Encode");
+            base64UrlEncCommand.AddAlias("enc");
+            base64UrlEncCommand.AddOption(new Option(new string[] { "--text", "-t" }, "Input Text")
+            {
+                Argument = new Argument<string>("text")
+            });
+            base64UrlEncCommand.AddOption(new Option(new string[] { "--input", "-i" }, "Input file path")
+            {
+                Argument = new Argument<FileInfo>("input")
+            });
+            base64UrlEncCommand.AddOption(new Option(new string[] { "--output", "-o" }, "Output file path")
+            {
+                Argument = new Argument<FileInfo>("output")
+            });
+            base64UrlEncCommand.Handler = CommandHandler.Create<string, FileInfo, FileInfo, IConsole>(async (text, input, output, console) =>
+            {
+                try
+                {
+                    string base64UrlEncodedText = null;
+
+                    if (text != null)
+                    {
+                        base64UrlEncodedText = Base64Url.Encode(text);
+                    }
+                    if (input != null)
+                    {
+                        base64UrlEncodedText = Base64Url.Encode(File.ReadAllText(input.FullName));
+                    }
+
+                    if (output == null)
+                    {
+                        console.Out.WriteLine(base64UrlEncodedText);
+                    }
+                    else
+                    {
+                        File.WriteAllText(output.FullName, base64UrlEncodedText);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    console.Out.WriteLine(ex.Message);
+                }
+            });
+            var base64UrlDecCommand = new Command("decode", "Decode");
+            base64UrlDecCommand.AddAlias("dec");
+            base64UrlDecCommand.AddOption(new Option(new string[] { "--text", "-t" }, "Input Text")
+            {
+                Argument = new Argument<string>("text")
+            });
+            base64UrlDecCommand.AddOption(new Option(new string[] { "--input", "-i" }, "Input file path")
+            {
+                Argument = new Argument<FileInfo>("input")
+            });
+            base64UrlDecCommand.AddOption(new Option(new string[] { "--output", "-o" }, "Output file path")
+            {
+                Argument = new Argument<FileInfo>("output")
+            });
+            base64UrlDecCommand.Handler = CommandHandler.Create<string, FileInfo, FileInfo, IConsole>(async (text, input, output, console) =>
+            {
+                try
+                {
+                    string base64UrlDecodedText = null;
+
+                    if (text != null)
+                    {
+                        base64UrlDecodedText = Base64Url.Decode(text);
+                    }
+                    if (input != null)
+                    {
+                        base64UrlDecodedText = Base64Url.Decode(File.ReadAllText(input.FullName));
+                    }
+
+                    if (output == null)
+                    {
+                        console.Out.WriteLine(base64UrlDecodedText);
+                    }
+                    else
+                    {
+                        File.WriteAllText(output.FullName, base64UrlDecodedText);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    console.Out.WriteLine(ex.Message);
+                }
+            });
+            base64UrlCommand.Add(base64UrlEncCommand);
+            base64UrlCommand.Add(base64UrlDecCommand);
+            rootCommand.AddCommand(base64UrlCommand);
+
+            return rootCommand;
+        }
+    }
+}
diff --git a/Kryptos/Kryptos/WireUpUuidExtensions.cs b/Kryptos/Kryptos/WireUpUuidExtensions.cs
index e86553c..e05a344 100644
--- a/Kryptos/Kryptos/WireUpUuidExtensions.cs
+++ b/Kryptos/Kryptos/WireUpUuidExtensions.cs
@@ -49,9 +49,6 @@ public static RootCommand WireUpUuidCommands(this RootCommand rootCommand)
                 {
                     console.Out.WriteLine(ex.Message);
                 }
-                finally
-                {
-                }
             });
 
             rootCommand.AddCommand(guidCommand);