add package hasher - skeleton

.vscode/settings.json

@@ -1,3 +1,3 @@
 {
-    "dotnet-test-explorer.testProjectPath": "GraphBuilder/tests"
+    "dotnet-test-explorer.testProjectPath": "*/tests"
 }

PackageHasher/src/HashAlgorithmExtensions.cs

@@ -0,0 +1,32 @@
+using System.Text;
+using System.Security.Cryptography;
+using System.IO;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace PackageAnalyzer
+{
+    public static class HashAlgorithmExtensions
+    {
+        public static async Task<byte[]> ComputeHashAsync(this HashAlgorithm alg, IEnumerable<FileInfo> files, string rootPath)
+        {
+            using (var cs = new CryptoStream(Stream.Null, alg, CryptoStreamMode.Write))
+            {
+                foreach (var file in files)
+                {
+                    // Will either include the rootPath or not.
+                    string fileName = file.FullName.Substring(rootPath.Length, file.FullName.Length - rootPath.Length);
+                    var pathBytes = Encoding.UTF8.GetBytes(fileName);
+                    cs.Write(pathBytes, 0, pathBytes.Length);
+
+                    using (var fs = file.OpenRead())
+                        await fs.CopyToAsync(cs);
+                }
+
+                cs.FlushFinalBlock();
+            }
+
+            return alg.Hash;
+        }
+    }
+}

PackageHasher/src/PackageHasher.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Text;
+using System.IO;
+using System.Threading.Tasks;
+using System.Security.Cryptography;
+using System.Linq;
+
+namespace PackageAnalyzer
+{
+    public class PackageHasher
+    {
+        public Dictionary<string, string> HashFolders(List<string> folders)
+        {
+            Dictionary<string, string> hasedFolders = new Dictionary<string, string>();
+
+
+            return hasedFolders;
+        }
+        async Task<string> HashFolder(DirectoryInfo folder, bool excludeRoot, string searchPattern = "*", SearchOption searchOption = SearchOption.AllDirectories)
+        {
+            string rootPath = String.Empty;
+
+            if(excludeRoot)
+            {
+                rootPath = folder.FullName.Substring(0, folder.FullName.Length - folder.FullName.Split('\\').Last().Length );
+            }   
+
+            using(var alg = MD5.Create())
+            {
+
+                var result = await alg.ComputeHashAsync(folder.EnumerateFiles(searchPattern, searchOption), rootPath);
+
+                // Build the final string by converting each byte
+                // into hex and appending it to a StringBuilder
+                StringBuilder sb = new StringBuilder();
+                for (int i = 0; i < result.Length; i++)
+                {
+                    sb.Append(result[i].ToString("X2"));
+                }
+
+                // And return it
+                return sb.ToString();
+
+            }
+        }
+    }
+}

PackageHasher/src/PackageHasher.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

PackageHasher/tests/PackageHaser.Tests.cs

@@ -0,0 +1,15 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace PackageAnalyzer.PackageHasher.Tests
+{
+
+    [TestClass]
+    public class PackageHasherTests
+    {
+        [TestMethod]
+        public void TestMethod1()
+        {
+        }
+    }
+
+}

PackageHasher/tests/tests.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
+    <PackageReference Include="coverlet.collector" Version="1.0.1" />
+  </ItemGroup>
+
+</Project>