ConfigureAppServiceApplicationLogToBlobStorage.ps1

param(
    [string]$resourceGroup,
    [string]$storageAccountName
    [string]$webAppName
)

Import-Module AzureRM.Storage

$sa = Get-AzureRmStorageAccount -ResourceGroupName $resourceGroup -Name $storageAccountName

Write-Host
Write-Host "Retrieved storage account"
Write-Verbose ($sa | Out-String)

New-AzureStorageContainer -Context $sa.Context -Name "webapp-logs" -ErrorAction Ignore | Out-Null

$sasToken = New-AzureStorageContainerSASToken -Context $sa.Context -Name webapp-logs -FullUri -Permission rwdl -ExpiryTime (Get-Date).Date.AddYears(200) -StartTime (Get-Date).Date

Write-Host
Write-Host "Generated SAS token"
Write-Verbose ($sasToken | Out-String)

$webApp = Get-AzureRmWebApp -ResourceGroupName $resourceGroup -Name $webAppName

Write-Host
Write-Host "Retrieved web app"
Write-Verbose ($webApp | Out-String)

$appSettings = [ordered]@{}
$webapp.SiteConfig.AppSettings | % { $appSettings[$_.Name] = $_.Value }

Write-Host

if ($appSettings.DIAGNOSTICS_AZUREBLOBCONTAINERSASURL -eq $null) {
  $appSettings.DIAGNOSTICS_AZUREBLOBCONTAINERSASURL = [string]$sasToken
	
  Write-Host "Updating web app"
  Set-AzureRmWebApp -ResourceGroupName $resourceGroup -Name $webAppName -AppSettings $appSettings | Out-Null
} else {
  Write-Host "Skipped updating web app, already contains the Diagnostics Azure Blob Container SAS URL"
}

Write-Host "Done"