Added a PowerShell script to validate NuGet packages

ValidateNuGetPackages.ps1

@@ -0,0 +1,150 @@
+<#
+
+.SYNOPSIS
+
+This script validates NuGet packages for required attributes.
+
+.EXAMPLE
+
+Microsoft.Omex.Tools.ValidateNuGetPackages.ps1 c:\omex\nuget
+
+.DESCRIPTION
+
+There are several required attributes in NuGet specification files (nuspec) which are required by Microsoft
+when the NuGet packages are published to NuGet.org.
+
+If these attributes are missing, the packages cannot be published.
+
+.NOTES
+
+The script is intended to be used as a step in the pull request validation pipeline.
+The script exits with code 1 if the validation failed.
+
+The script verifies if the following attributes are present in the nuspec file:
+ - title
+ - description
+ - project url
+ - tags
+
+
+.PARAMETER NuGetFolder
+Path which contains the NuGet packages to be scanned.
+The path is scanned recursively for *.nupkg files.
+
+#>
+
+
+param (
+	[Parameter(Mandatory = $true)]
+	[string]$NuGetFolder
+)
+
+<#
+The validates the NuGet package for the required attributes
+and returns false if some of them is missing.
+#>
+function ValidateNuGetPackage([string]$nugetPackage) {
+    Write-Host "Validating $nugetPackage"
+
+    $contents = ExtractNuSpec($nugetPackage)
+    $xmldoc = [xml]$contents
+
+    $result = $True
+
+    if ($xmldoc.package.metadata.title.Length -eq 0)
+    {
+        Write-Error "Title is missing."
+        $result = $False
+    }
+
+    if ($xmldoc.package.metadata.description.Length -eq 0)
+    {
+        Write-Error "Description is missing."
+        $result = $False
+    }
+
+    if ($xmldoc.package.metadata.projecturl.Length -eq 0)
+    {
+        Write-Error "ProjectUrl is missing."
+        $result = $False
+    }
+
+    if ($xmldoc.package.metadata.tags.Length -eq 0)
+    {
+        Write-Error "Tags is missing."
+        $result = $False
+    }
+
+    if ($result -eq $True)
+    {
+        Write-Host "Successfully validated NuGet package $nugetPackage"
+    }
+    else
+    {
+        Write-Error "NuGet package validation failed for $nugetPackage"
+    }
+
+    return $result
+}
+
+<#
+The function extracts the contents of the NuGet specification file
+from the NuGet archive.
+#>
+function ExtractNuSpec([string]$nugetPackage)
+{
+    $zip = [io.compression.zipfile]::OpenRead($nugetPackage)
+    $file = $null
+    foreach ($entry in $zip.Entries)
+    {
+        if ($entry.FullName.EndsWith('.nuspec'))
+        {
+            $file = $entry
+            break
+        }
+    }
+
+    if ($null -eq $file)
+    {
+        Write-Error "Unable to find NuGet specification in NuGet package $nugetPackage"
+        return $false
+    }
+
+    $stream = $file.Open()
+    $reader = New-Object IO.StreamReader($stream)
+    $text = $reader.ReadToEnd()
+
+    $reader.Close()
+    $stream.Close()
+    $zip.Dispose()
+
+    return $text
+}
+
+Add-Type -assembly "system.io.compression.filesystem"
+
+Write-Host "Scanning folder $NuGetFolder"
+
+#Scanning the input folder recursively to get a list of NuGet packages to validate
+$nugetFiles = Get-ChildItem "$NuGetFolder\\*.nupkg" -Recurse
+
+Write-Host "The following $($nugetFiles.Count) NuGet packages will be validated"
+foreach ($file in $nugetFiles)
+{
+    Write-Host $file
+}
+
+$result = $true
+foreach ($file in $nugetFiles)
+{
+    $currentResult = ValidateNuGetPackage $file
+    if ($currentResult -eq $false)
+    {
+        $result = $false
+    }
+}
+
+if ($result -eq $false)
+{
+    exit 1
+}