PSGraylog/Functions/Public/Connect-GraylogService.ps1

function Connect-GraylogService {
	<#
	.SYNOPSIS
		Connects to the Graylog server.
	.DESCRIPTION
		Connects to the Graylog server using the provided credentials.
	.PARAMETER Credential
		The credentials to use to connect to the Graylog server.
	.OUTPUTS
		None, the session is stored in the global variable $GraylogSession.
	.EXAMPLE
		Connect-GraylogService
		Connects to the Graylog server using the stored credentials.
	.EXAMPLE
		Connect-GraylogService -Credential (Get-Credential)
		Connects to the Graylog server using the provided credentials prompting for both the username and password.
	.EXAMPLE
		Connect-GraylogService -Credential (Get-Credential -UserName "ab123456")
		Connects to the Graylog server using the provided credentials, prompting for just a password.
	.EXAMPLE
		$Credential = [PSCredential]::new("ab123456", (ConvertTo-SecureString "Password123" -AsPlainText -Force))
		Connect-GraylogService -Credential $Credential
		Connects to the Graylog server using the provided credentials without prompting for any input. (Other methods of creating a PSCredential object can be used)
	.NOTES
		The session is stored in the global variable $GraylogSession and is used for subsequent requests to the Graylog server.
	#>
	[Alias("Connect-Graylog")]
	param (
		[Parameter()]
		[PSCredential]
		$Credential
	)
	if ((Test-GraylogSession -SkipSecretCheck)) { return } # If the session is still valid, don't create a new one
	if (-NOT $Credential) {
		try {
			$Credential = Get-Secret Graylog_Credential -Vault Graylog -ErrorAction Stop
		} catch {
			try {
				Write-Host "The Graylog Credential secret is missing, prompting for input..."
				$Credential = Get-Credential -Message "Enter your Graylog credentials (the same way as you would via the web service)"
				$Credential | Set-Secret Graylog_Credential -ErrorAction Stop
			} catch {
				throw "Failed to set the Graylog Credential secret: $_"
			}
		}
	}
	$Request = @{
		Method = "POST"
		URI = "$(Get-Secret Graylog_BaseURI -Vault Graylog -AsPlainText)/api/system/sessions"
		Body = ConvertTo-Json @{
			host = $BaseURI.Authority
			username = $Credential.Username.Split("@")[0]
			password = $Credential.GetNetworkCredential().Password
		}
		ContentType = "application/json"
		UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML; like Gecko) Chrome/125.0.0.0 Safari/537.36 Edg/125.0.0.0"
		Headers = @{ "X-Requested-By" = "XMLHttpRequest" }
		SessionVariable = "GraylogSession"
	}
	# Use a regular Invoke-RestMethod for the initial sign-in request to avoid any issues with the WebSession
	try { $null = Invoke-RestMethod @Request }
	catch { throw $_.Exception.Message }

	$GraylogSession | ConvertFrom-GraylogSession | Set-Secret Graylog_Session
}
# Export-ModuleMember -Function Connect-Graylog