Perform Transform on Azure WebApp XML file - Sitecore

transform-azure-sitecore-config.ps1

param(
    [string]$KuduPath,
    [string[]]$XDTs,
    [string]$TenantId,
    [string]$SubscriptionId,
    [string]$ResourceGroupName,
    [string]$WebAppServiceName,
    [string]$SlotName = "",
    [string]$ServicePrincipalID,
    [string]$ServicePrincipalKey,
    [hashtable]$Tokens
)
 
function Get-AzureRmWebAppPublishingCredentials($resourceGroupName, $webAppName, $slotName = $null){
    if ([string]::IsNullOrWhiteSpace($slotName)){
        $resourceType = "Microsoft.Web/sites/config"
        $resourceName = "$webAppName/publishingcredentials"
    }
    else{
        $resourceType = "Microsoft.Web/sites/slots/config"
        $resourceName = "$webAppName/$slotName/publishingcredentials"
    }
    $publishingCredentials = Invoke-AzureRmResourceAction -ResourceGroupName $resourceGroupName -ResourceType $resourceType -ResourceName $resourceName -Action list -ApiVersion 2015-08-01 -Force
        return $publishingCredentials
}
 
function Get-KuduApiAuthorisationHeaderValue($resourceGroupName, $webAppName, $slotName = $null){
    $publishingCredentials = Get-AzureRmWebAppPublishingCredentials $resourceGroupName $webAppName $slotName
    $ret = @{}
    $ret.header = ("Basic {0}" -f [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $publishingCredentials.Properties.PublishingUserName, $publishingCredentials.Properties.PublishingPassword))))
    $ret.url = $publishingCredentials.Properties.scmUri
    return $ret
}
 
function Get-FileFromWebApp($resourceGroupName, $webAppName, $slotName = "", $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Downloading File from WebApp. Source: '$kuduApiUrl'." -ForegroundColor DarkGray
    $tmpPath = "$($env:TEMP)\$([guid]::NewGuid()).xml"
    $null = Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method GET `
                        -ContentType "multipart/form-data" `
                        -OutFile $tmpPath
    $ret = Get-Content $tmpPath | Out-String
    Remove-Item $tmpPath -Force
    return $ret
}
function Write-FileToWebApp($resourceGroupName, $webAppName, $slotName = "", $fileContent, $kuduPath){
    $KuduAuth = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    $kuduApiAuthorisationToken = $KuduAuth.header
    $kuduApiUrl = $KuduAuth.url + "/api/vfs/site/wwwroot/$kuduPath"
 
    Write-Host " Writing File to WebApp. Destination: '$kuduApiUrl'." -ForegroundColor DarkGray
 
    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method Put `
                        -ContentType "multipart/form-data"`
                        -Body $fileContent
}
function Update-XmlDocTransform($xml, $xdt, $tokens)
{
    Add-Type -LiteralPath "$PSScriptRoot\Microsoft.Web.XmlTransform.dll"
 
    $xmldoc = New-Object Microsoft.Web.XmlTransform.XmlTransformableDocument;
    $xmldoc.PreserveWhitespace = $true
    $xmldoc.LoadXml($xml);
    $useTokens = $false
    if ($tokens -ne $null -and $tokens.Count -gt 0){
        $useTokens = $true
        $sb = [System.Text.StringBuilder]::new((Get-Content -Path $xdt))
        $tmpPath = "$($env:TEMP)\$([guid]::NewGuid()).xdt"
        $tokens.Keys | ForEach-Object{
            $null = $sb.Replace($_, $tokens[$_])
        }
        Set-Content -Path $tmpPath -Value $sb.ToString()
        $xdt = $tmpPath
    }
     
    $transf = New-Object Microsoft.Web.XmlTransform.XmlTransformation($xdt);
    if ($transf.Apply($xmldoc) -eq $false)
    {
        throw "Transformation failed."
    }
    if ($useTokens){
        Remove-Item -Path $xdt -Force
    }
    return $xmldoc.OuterXml
}
$Credential = New-Object -TypeName PSCredential($ServicePrincipalID, (ConvertTo-SecureString -String $ServicePrincipalKey -AsPlainText -Force))
 
 
# Connect to Azure using SP
$connectParameters = @{
    Credential     = $Credential
    TenantId       = $TenantId
    SubscriptionId = $SubscriptionId
}
 
Write-Host 'Connecting to Azure.'
 
$null = Add-AzureRmAccount @connectParameters -ServicePrincipal
 
$contents = Get-FileFromWebApp `
    -resourceGroupName $ResourceGroupName `
    -webAppName $WebAppServiceName `
    -slotName $SlotName `
    -kuduPath $KuduPath
$XDTs | Foreach-Object{
    $contents = Update-XmlDocTransform -xml $contents -xdt "$PSScriptRoot\XDT\$_.xdt" -tokens $Tokens
}
Write-FileToWebApp `
    -resourceGroupName $ResourceGroupName `
    -webAppName $WebAppServiceName `
    -slotName $SlotName `
    -kuduPath $KuduPath `
    -fileContent $contents