Playing with slack integration from Octopus Deploy

OctopusSlackIntegration.ps1

add-type @"
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy


$OctopusParameters = @{
    "Username" = "Foo Bar";
    "HookUrl" = "https://hooks.slack.com/services/???????????????????";
    "Channel" = "#integrationtesting";
    "IconUrl" = "http://octopusdeploy.com/content/resources/favicon.png";
    "IncludeMachineName" = "false";
    "SendMessageOn" = "FailureAndSuccess";
    "Octopus.Deployment.Error" = "Foo";
    "Octopus.Task.Argument[_Octopus.Web.BaseUrl_]" = "http://?????????.com";
    "Octopus.Web.DeploymentLink" = "/app#/projects/????????????????????????????";
}

$OctopusReleaseNumber = "1.2.3";
$OctopusProjectName = "Project Name";
$OctopusEnvironmentName = "Environment Name";
$FormattedMachineName = "";

function Slack-Rich-Notification ($notification)
{
    $payload = @{
        channel = $OctopusParameters['Channel']
        username = $OctopusParameters['Username'];
        icon_url = $OctopusParameters['IconUrl'];
        attachments = @(@{
            fallback = $notification["fallback"];
            color = $notification["color"];
            title = $notification["title"];
            title_link = $notification["title_link"];
            text = $notification["text"];
            fields = @(@{
                title = "Environment: " + $notification['environment'];
                short = "true";
                };
                @{
                title = "Release: " + $notification['release'];
                short = "true";
                };);
            };);
     
    }

    Invoke-RestMethod -Method POST -Body ($payload | ConvertTo-Json -Depth 4) -Uri $OctopusParameters['HookUrl']
}

$SendMessagesOn = $OctopusParameters['SendMessageOn'];
$payload = @{
    release = $OctopusReleaseNumber;
    environment = $OctopusEnvironmentName;
    title_link = $OctopusParameters['Octopus.Task.Argument[_Octopus.Web.BaseUrl_]'] + $OctopusParameters['Octopus.Web.DeploymentLink'];}


if (($OctopusParameters['Octopus.Deployment.Error'] -eq $null) -and ($SendMessagesOn -eq "FailureAndSuccess")){
    $payload.Add("title", "Deployed $OctopusProjectName");
    $payload.Add("fallback", "Deployed $OctopusProjectName release $OctopusReleaseNumber to $OctopusEnvironmentName successfully");
    $payload.Add("color", "good");
    
    Slack-Rich-Notification $payload;

} elseif ($OctopusParameters['Octopus.Deployment.Error'] -ne $null) {
    $payload.Add("title", "Failed to deploy $OctopusProjectName");
    $payload.Add("fallback", "Failed to deploy $OctopusProjectName release $OctopusReleaseNumber to $OctopusEnvironmentName successfully");
    $payload.Add("color", "danger");
    
    Slack-Rich-Notification $payload;
}