syncgraphmetadata.ps1

################################################################################
#
# Credit to Sergey Babkins
# https://blogs.msdn.microsoft.com/sergey_babkins_blog/2016/12/31/how-to-pretty-print-xml-in-powershell-and-text-pipelines/

function Format-Xml {
<#
.SYNOPSIS
Format the incoming object as the text of an XML document.
#>
    param(
        ## Text of an XML document.
        [Parameter(ValueFromPipeline = $true)]
        [string[]]$Text
    )

    begin {
        $data = New-Object System.Collections.ArrayList
    }
    process {
        [void] $data.Add($Text -join "`n")
    }
    end {
        $doc=New-Object System.Xml.XmlDataDocument
        $doc.LoadXml($data -join "`n")
        $sw=New-Object System.Io.Stringwriter
        $writer=New-Object System.Xml.XmlTextWriter($sw)
        $writer.Formatting = [System.Xml.Formatting]::Indented
        $doc.WriteContentTo($writer)
        $sw.ToString()
    }
}
# Export-ModuleMember -Function Format-Xml

################################################################################
#
# Download metadata files.
#

Write-Output "PowerShell function executed at:$(get-date)";

$baseUrl = "https://graph.microsoft.com"
$target = "/`$metadata"
#$basePath = "C:\repos\Graph_SDK_Pipeline\submodules\Graph_Metadata\" # comment this out to use the present working directory.
$pathSegment = "v1.0", "beta"

# Use this if you want this to run in the PWD. 
if ([string]::IsNullOrEmpty($basePath))
{
    $basePath = $PWD
}

# Make sure that $basePath contains a trailing \
if ($basePath -notmatch '.+?\\$')
{
    $basePath = $basePath + "\"
}

# Download metadata for each segment listed in $pathSegment.
for ($i=0; $i -lt $pathSegment.Length; $i++) {
   $url = $baseUrl + "/" + $pathSegment[$i] + $target
   
   $a = Get-Date

   #format month and day for the file name. Single digit month and day values are turned into two digits: 0x
   if ($a.Month -lt 10) {
       $month = "0" + $a.Month
   } else {
       $month = $a.Month
   }

   if ($a.Day -lt 10) {
       $day = "0" + $a.Day
   } else {
       $day = $a.Day
   }

   # Create file name based on target metadata and the current date.
   $fileName = $pathSegment[$i] + "_" + $a.Year + "_" + $month + "_" + $day +".xml"
   $dirPath = $basePath + $pathSegment[$i]

   # Create the target path directory if it doesn't already exist.
   If(!(Test-Path $dirPath))
   {
        New-Item -ItemType Directory -Force -Path $dirPath
   }

   $path = $dirPath + "\" + $fileName

   # Check that we haven't already downloaded this file.
   # If it doesn't exist, let's download and format it.
   If(!(Test-Path $path))
   {
       # Download the metadata and save it.   
       "Downloading [$url]`nSaving at [$path]" 
       $client = new-object System.Net.WebClient 
       $client.DownloadFile($url, $path) 

       # Format the metadata.
       Format-Xml (Get-Content $path) | Out-File $path
   }
   Else 
   {
       "We've already downloaded [$url] for today."
   }
}