Write custom logs via PowerShell

using namespace System.Net

# Input bindings are passed in via param block.

param($Request, $TriggerMetadata)

# Interact with query parameters or the body of the request.

$LogContent = $Request.Body.LogContent

$LogType = $Request.Body.LogType

Function Build-Signature ($customerId, $sharedKey, $date, $contentLength, $method, $contentType, $resource){

    $xHeaders = "x-ms-date:" + $date

    $stringToHash = $method + "`n" + $contentLength + "`n" + $contentType + "`n" + $xHeaders + "`n" + $resource

 

    $bytesToHash = [Text.Encoding]::UTF8.GetBytes($stringToHash)

    $keyBytes = [Convert]::FromBase64String($sharedKey)

 

    $sha256 = New-Object System.Security.Cryptography.HMACSHA256

    $sha256.Key = $keyBytes

    $calculatedHash = $sha256.ComputeHash($bytesToHash)

    $encodedHash = [Convert]::ToBase64String($calculatedHash)

    $authorization = 'SharedKey {0}:{1}' -f $customerId,$encodedHash

    return $authorization

}

 

Function Post-LogAnalyticsData ($customerId, $sharedKey, $body, $logType){

    $method = "POST"

    $contentType = "application/json"

    $resource = "/api/logs"

    $rfc1123date = ([DateTime]::UtcNow).ToString("r")

    $contentLength = $body.Length

    $signature = Build-Signature -customerId $customerId -sharedKey $sharedKey -date $rfc1123date -contentLength $contentLength -method $method -contentType $contentType -resource $resource

   

    $uri = "https://" + $customerId + ".ods.opinsights.azure.com" + $resource + "?api-version=2016-04-01"

 

    $headers = @{

        "Authorization" = $signature;

        "Log-Type" = $logType;

        "x-ms-date" = $rfc1123date;

    }

 

    $response = Invoke-WebRequest -Uri $uri -Method $method -ContentType $contentType -Headers $headers -Body $body -UseBasicParsing

    return $response.StatusCode

}

$customerId = ""

$sharedKey = ""

$LogType = ""

$Properties = [Ordered] @{

    "ComputerName"     = $env:computername

    "User"             = $env:Username

}

$CustomLogs = New-Object -TypeName "PSObject" -Property $Properties | ConvertTo-JSON -Depth 10

#Submit the data to the API endpoint

$params = @{

    CustomerId = $customerId

    SharedKey  = $sharedKey

    Body       = ([System.Text.Encoding]::UTF8.GetBytes($CustomLogs))

    LogType    = $LogType

}

$LogResponse = Post-LogAnalyticsData @params

$LogResponse