notify slack on failed teamcity build

notify.ps1

function Test-TeamCityBuildStatus
{
    param
    (
        [string] $ServerUrl ="[TC server url]",
        [string] $UserName = "[tc user]",
        [string] $Password = "[TC password]",
        [string] $BuildTypeId = "[build id]"
    )
 
    try
    {
        $client = New-Object System.Net.WebClient
        $client.Credentials = New-Object System.Net.NetworkCredential $UserName, $Password
 
        $url = "$ServerUrl/httpAuth/app/rest/buildTypes/id:$BuildTypeId/builds/canceled:false/status"
 
        $status = $client.DownloadString($url)
 
        if ($status -ne "SUCCESS")
        {
            return $false
        }
        else
        {
            $url = "$ServerUrl/httpAuth/app/rest/buildTypes/id:$buildTypeId/builds/canceled:false,running:any/status"
            $status = $client.DownloadString($url)
            $status -eq "SUCCESS"
        }
    }
    catch
    {
        return $null
    }
}

function Notify-Slack($payload)
{
    Invoke-WebRequest `
	    -Uri "[SLACK HOOK URL]" `
	    -Method "POST" `
	    -Body (ConvertTo-Json -Compress -InputObject $payload)
}


$result = Test-TeamCityBuildStatus;

if (!$result)
{
  $payload = @{
	"channel" = "[#Channel]";
	"icon_emoji" = ":bomb:";
	"text" = "<!channel> Deployment to CI has failed!!!";
	"username" = "Teamcity";}
    Notify-Slack -payload $payload
}