Post message with results to Slack about plexbackup HOT 4 OPEN

#--------------------------------------------------------------------------
# SlackMessage
#   Generates the body of the Slack message.
function SlackMessage {
    [CmdletBinding()]
    param (
    )
    WriteDebug "Entered SlackMessage."

    [string]$backupMode     = $null
    [string]$dataDirPath    = $null

    if ($Script:Type) {
        $backupMode = $Script:Mode + " -" + $Type
    }
    else {
        $backupMode = $Script:Mode
    }

    if ($Script:Test) {
        $backupMode += " (Test)"
    }

    $dataDirPath = $Script:BackupDir | ConvertTo-Json

    $body = '*PlexBackup.ps1* completed the `' + $backupMode + '` operation on *PlexServer* (Plex version: ' + $Script:PlexVersion + '). Backup started at *' + $Script:StartTime + '* and ended at *' + $Script:EndTime + '* (total of *' + $Script:Duration + '*). Backup folder `' + $dataDirPath.Replace("`"","") + '` contains *' + $Script:ObjectCount + '* objects and *' + $Script:BackupSize + '* GB of data.'

    WriteDebug "Exiting SlackMessage."
    return $body
}

$slackHeaderSuccess = "\u2705 Success"
$slackHeaderError = "\uD83D\uDC4E Failed"

if ($Script:ErrorResult) {
    $slackHeader = $slackHeaderError
}
else {
    $slackHeader = $slackHeaderSuccess
}

$messageSlack = SlackMessage

$bodySlack = @"
{
    "text": "$slackHeader - $messageSlack",
    "blocks": [
        {
            "type": "header",
            "text": {
                "type": "plain_text",
                "text": "$slackHeader",
                "emoji": true
            }
        },
        {
            "type": "section",
            "text": {
                "type": "mrkdwn",
                "text": "$messageSlack"
            }
        }
    ]
}
"@

$uriSlack = "https://hooks.slack.com/services/<my-unique-url>"

Invoke-RestMethod -uri $uriSlack -Method Post -body $bodySlack -ContentType 'application/json'