Enable package signing on NuGet.Server .nupkgs (#73)

Address NuGet/Engineering#1816

Author: joelverhagen

.nuget/packages.config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="xunit.runner.console" version="2.1.0" />
+  <package id="MicroBuild.Core" version="0.3.0" />
 </packages>

build.ps1

@@ -9,7 +9,7 @@ param (
     [string]$SemanticVersion = '1.0.0-zlocal',
     [string]$Branch,
     [string]$CommitSHA,
-    [string]$BuildBranch = '795fed66b8bae2d248237ee5ec82e688e7174a42'
+    [string]$BuildBranch = '1c8734ee61e209f159972ab974784ba55ee2bd6d'
 )
 
 $msBuildVersion = 15;
@@ -30,7 +30,7 @@ if (-not (Test-Path "$PSScriptRoot/build")) {
 # Enable TLS 1.2 since GitHub requires it.
 [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
 
-wget -UseBasicParsing -Uri "https://raw.githubusercontent.com/NuGet/ServerCommon/$BuildBranch/build/init.ps1" -OutFile "$PSScriptRoot/build/init.ps1"
+Invoke-WebRequest -UseBasicParsing -Uri "https://raw.githubusercontent.com/NuGet/ServerCommon/$BuildBranch/build/init.ps1" -OutFile "$PSScriptRoot/build/init.ps1"
 . "$PSScriptRoot/build/init.ps1" -BuildBranch "$BuildBranch"
 
 Write-Host ("`r`n" * 3)
@@ -91,6 +91,12 @@ Invoke-BuildStep 'Creating artifacts' {
     } `
     -ev +BuildErrors
 
+Invoke-BuildStep 'Signing the packages' { 
+        $ProjectPath = Join-Path $PSScriptRoot "build\sign.proj"
+        Build-Solution $Configuration $BuildNumber -MSBuildVersion "$msBuildVersion" $ProjectPath `
+    } `
+    -ev +BuildErrors
+
 Trace-Log ('-' * 60)
 
 ## Calculating Build time

build/sign.proj

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" DefaultTargets="AfterBuild" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\packages\MicroBuild.Core.0.3.0\build\MicroBuild.Core.props" Condition="Exists('..\packages\MicroBuild.Core.0.3.0\build\MicroBuild.Core.props')" />
+
+  <PropertyGroup>
+    <RepositoryRootDirectory>$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), 'README.md'))\</RepositoryRootDirectory>
+    <IntermediateOutputPath>$(RepositoryRootDirectory)artifacts\sign\obj\</IntermediateOutputPath>
+    <OutDir>$(RepositoryRootDirectory)</OutDir>
+    <SignTargetsDependOn>GetOutputNupkgs</SignTargetsDependOn>
+  </PropertyGroup>
+
+  <Target Name="GetOutputNupkgs">
+    <ItemGroup>
+      <FilesToSign Include="$(RepositoryRootDirectory)artifacts\*.nupkg">
+        <Authenticode>NuGet</Authenticode>
+      </FilesToSign>
+    </ItemGroup>
+    <Message Text="Files to sign:%0A@(FilesToSign, '%0A')" Importance="High" />
+  </Target>
+
+  <Target Name="AfterBuild" DependsOnTargets="$(SignTargetsDependOn)"/>
+
+  <Import Project="..\packages\MicroBuild.Core.0.3.0\build\MicroBuild.Core.targets" Condition="Exists('..\packages\MicroBuild.Core.0.3.0\build\MicroBuild.Core.targets')" />
+</Project>