Powershell script to compare the Azure Portal Application Settings in one site to those of another

CompareAzurePortalApplicationSettings.ps1

Clear-Host
Login-AzureRmAccount #Only necessary once per session
$SOURCE_SUBSCRIPTION_NAME = "YOUR SOURCE SUBSCRIPTION NAME"
$SOURCE_SITE              = "YOUR SOURCE SITE NAME (xxxx in xxxx.azurewebsites.net)"
$TARGET_SUBSCRIPTION_NAME = "YOUR TARGET SUBSCRIPTION NAME"
$TARGET_SITE              = "YOUR TARGET SITE NAME (xxxx in xxxx.azurewebsites.net)"

function GetSortedApplicationSettings ([string] $subscriptionName, [string] $siteName)
{
    (Get-AzureRmSubscription -SubscriptionName $subscriptionName | Select-AzureRmSubscription) > $null
    $sortedPortalAppSettings = New-Object System.Collections.SortedList
    $webApp = Get-AzureRmWebApp -Name $siteName
    $appSettingList = $webApp.SiteConfig.AppSettings
    foreach($setting in $appSettingList)
    {
        $sortedPortalAppSettings.Add($setting.Name, $setting.Value)
    }
    return $sortedPortalAppSettings
}

#Get Source Portal App Settings
$sortedSourcePortalAppSettings = GetSortedApplicationSettings -subscriptionName $SOURCE_SUBSCRIPTION_NAME -siteName $SOURCE_SITE
Write-Host "SOURCE PORTAL APPSETTINGS ($SOURCE_SITE)" -ForegroundColor Yellow
$sortedSourcePortalAppSettings | Format-Table -AutoSize

#Get Target Portal App Settings
$sortedTargetPortalAppSettings = GetSortedApplicationSettings -subscriptionName $TARGET_SUBSCRIPTION_NAME -siteName $TARGET_SITE
Write-Host "TARGET PORTAL APPSETTINGS ($TARGET_SITE)" -ForegroundColor Yellow
$sortedTargetPortalAppSettings | Format-Table -AutoSize

Write-Host "COMPARISON PROGRESS" -ForegroundColor Yellow
$missingOnTarget = New-Object System.Collections.SortedList
foreach($sourceKey in $sortedSourcePortalAppSettings.Keys)
{
    Write-Host "Checking entry $sourceKey ..."
    if (!$sortedTargetPortalAppSettings.ContainsKey($sourceKey))
    {
        $sourceValue = $sortedSourcePortalAppSettings[$sourceKey]
        $missingOnTarget.Add($sourceKey, $sourceValue)
        Write-Host "Target ($TARGET_SITE) does not contain $sourceKey, which is present in Source ($SOURCE_SITE) with value: $sourceValue" -ForegroundColor Cyan
    }
    else
    {
        Write-Host "$sourceKey present in both sites." -ForegroundColor Green
    }
}

if ($missingOnTarget.Count -gt 0)
{
    Write-Host "`nDISCREPANCY REPORT" -ForegroundColor Yellow
    Write-Host "The following keys are present in the source site ($SOURCE_SITE), but not in the target site ($TARGET_SITE)"
    $missingOnTarget | Format-Table -AutoSize
}
else
{
    Write-Host "`nNO DISCREPANCIES" -ForegroundColor Green
}