AzureRunbookUpdateHolidaySchedules.ps1

param
(
    [Parameter (Mandatory = $false)]
    [object] $WebhookData
)

$teamsWebhookUrl = ""

$Body = (ConvertFrom-Json -InputObject $WebhookData.RequestBody)

Write-Output $Body

# Initialize Variables
$scheduleId = $Body.scheduleId
$oldStartDate = $Body.oldStartDate
$oldEndDate = $Body.oldEndDate
$newStartDate = $Body.newStartDate
$newEndDate = $Body.newEndDate

$Credentials = Get-AutomationPSCredential -Name "AzAutomationAdmin"

Connect-MicrosoftTeams -Credential $Credentials

$schedule = Get-CsOnlineSchedule -Id $scheduleId

$matchingOldDateTimeRange = $schedule.FixedSchedule.DateTimeRanges | Where-Object {$_.Start -eq $oldStartDate -and $_.End -eq $oldEndDate}

$schedule.FixedSchedule.DateTimeRanges = $schedule.FixedSchedule.DateTimeRanges | Where-Object {$_ -notcontains $matchingOldDateTimeRange}

$newDateTimeRange = New-CsOnlineDateTimeRange -Start $newStartDate -End $newEndDate
$schedule.FixedSchedule.DateTimeRanges += $newDateTimeRange

Set-CsOnlineSchedule -Instance $schedule

Disconnect-MicrosoftTeams

$confirmMessageCard = @"
{
    "@context": "https://schema.org/extensions",
    "@type": "MessageCard",
    "themeColor": "7FBA00",
    "title": "Holiday Schedule Updated",
    "text": "Holiday Schedule Name: **$($schedule.Name)**<br>Old start and end date: **$oldStartDate** - **$oldEndDate**<br>New start and end date: **$($newDateTimeRange.Start)** - **$($newDateTimeRange.End)**"
}
"@

Invoke-RestMethod -uri $teamsWebhookUrl -Method Post -body $confirmMessageCard -ContentType 'application/json; charset=UTF-8'