WhatsUpGoldPS

0.1.13

functions/Connect-WUGServer.ps1

                                <#

.SYNOPSIS

Connects to a WhatsUp Gold (WUG) server and obtains an OAuth 2.0 authorization token.

.DESCRIPTION

The Connect-WUGServer function establishes a connection to a WhatsUp Gold server using the specified parameters,

and obtains an authorization token using the OAuth 2.0 password grant type flow. The function validates the

input parameters and handles credential input, and also allows for ignoring SSL certificate validation errors.

The authorization token is stored in a global variable for subsequent API requests.

.PARAMETER serverUri

The URI of the WhatsUp Gold server to connect to.

.PARAMETER Protocol

The protocol to use for the connection (http or https). Default is https.

.PARAMETER Username

Plaintext username to use for authentication. Required when using the UserPassSet parameter set. For best security, use -Crdential

.PARAMETER Password

Plaintext password to use for authentication. Required when using the UserPassSet parameter set. For best security, use -Credential

.PARAMETER Credential

A PSCredential object containing the username and password for authentication. Required when using the CredentialSet parameter set.

.PARAMETER TokenEndpoint

The endpoint for obtaining the OAuth 2.0 authorization token. Default is "/api/v1/token".

.PARAMETER Port

The TCPIP port to use for the connection. Default is 9644.

.PARAMETER IgnoreSSLErrors

A switch that allows for ignoring SSL certificate validation errors. WARNING: Use this option with caution

For best security, use a valid certificate

.EXAMPLE

Connect-WUGServer -serverUri "whatsup.example.com" -Username "admin" -Password "mypassword"

Connects to the WhatsUp Gold server at "https://whatsup.example.com:9644" with the provided credentials, and obtains an

OAuth 2.0 authorization token.

$Cred = Get-Credential

Connect-WUGServer -serverUri 192.168.1.250 -Credential $Cred -IgnoreSSLErrors

.NOTES

Author: Jason Alberino (jason@wug.ninja)

Last Modified: 2024-09-26

.LINK

# Link to related documentation or resources

https://docs.ipswitch.com/NM/WhatsUpGold2024/02_Guides/rest_api/index.html#section/Handling-Session-Tokens

#>

function Connect-WUGServer {

    [CmdletBinding(DefaultParameterSetName = 'CredentialSet')]

    param (

        # Common Parameters for Both Parameter Sets

        [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]

        [string]$serverUri,

        [Parameter()]

        [ValidateSet("http", "https")]

        [string]$Protocol = "https",

        [Parameter()]

        [ValidatePattern("^(/[a-zA-Z0-9]+)+/?$")]

        [string]$TokenEndpoint = "/api/v1/token",

        [Parameter()]

        [ValidateRange(1, 65535)]

        [int32]$Port = 9644,

        [Parameter()]

        [switch]$IgnoreSSLErrors,

        # Unique Parameters for 'CredentialSet'

        [Parameter(Mandatory = $true, ParameterSetName = 'CredentialSet')]

        [System.Management.Automation.Credential()]

        [PSCredential]$Credential,

        # Unique Parameters for 'UserPassSet'

        [Parameter(Mandatory = $true, ParameterSetName = 'UserPassSet')]

        [string]$Username,

        [Parameter(Mandatory = $true, ParameterSetName = 'UserPassSet')]

        [string]$Password

    )

    begin {

        Write-Debug "Starting Connect-WUGServer function"

        Write-Debug "Server URI: $serverUri, Protocol: $Protocol, Port: $Port"

        # Input validation

        # Check if the hostname or IP address is resolvable

        $ip = $null

        try { 

            $ip = [System.Net.Dns]::GetHostAddresses($serverUri) 

        } catch { 

            throw "Cannot resolve hostname or IP address. Please enter a valid IP address or hostname." 

        }

        if ($null -eq $ip) { 

            throw "Cannot resolve hostname or IP address, ${serverUri}. Please enter a resolvable IP address or hostname." 

        }

        # Check if the port is open

        try {

            $tcpClient = New-Object System.Net.Sockets.TcpClient

            $connectResult = $tcpClient.BeginConnect($ip[0], $Port, $null, $null)

            $waitResult = $connectResult.AsyncWaitHandle.WaitOne(500)

            if (!$waitResult -or !$tcpClient.Connected) { 

                $tcpClient.Close(); 

                throw "The specified port, ${Port}, is not open or accepting connections." 

            } 

            $tcpClient.Close()

        }

        catch {

            throw "The specified port, $Port, is not open or accepting connections."

        }

        # Handle Credentials Based on Parameter Set

        switch ($PSCmdlet.ParameterSetName) {

            'CredentialSet' {

                Write-Debug "Using Credential parameter set."

                $Username = $Credential.GetNetworkCredential().UserName

                $Password = $Credential.GetNetworkCredential().Password

            }

            'UserPassSet' {

                Write-Debug "Using Username and Password parameter set."

                # Username and Password are already provided

            }

            default {

                throw "Invalid parameter set. Please specify either -Credential or both -Username and -Password."

            }

        }

        # SSL Certificate Validation Handling

        if ($IgnoreSSLErrors -and $Protocol -eq "https") {

            if ($PSVersionTable.PSEdition -eq 'Core') { 

                $Script:PSDefaultParameterValues["invoke-restmethod:SkipCertificateCheck"] = $true

                $Script:PSDefaultParameterValues["invoke-webrequest:SkipCertificateCheck"] = $true

            } else { 

                [System.Net.ServicePointManager]::ServerCertificateValidationCallback = { $true }

            }

            Write-Warning "Ignoring SSL certificate validation errors. Use this option with caution."

        }    

        # Set variables

        $global:IgnoreSSLErrors = $IgnoreSSLErrors

        $global:WhatsUpServerBaseURI = "${Protocol}://${serverUri}:${Port}"

        $global:tokenUri = "${global:WhatsUpServerBaseURI}${TokenEndpoint}"

        $global:WUGBearerHeaders = @{"Content-Type" = "application/json" }

        $tokenBody = "grant_type=password&username=${Username}&password=${Password}"

    }

    process {

        # Attempt to connect and retrieve the token

        try {

            $token = Invoke-RestMethod -Uri $global:tokenUri -Method Post -Headers $global:WUGBearerHeaders -Body $tokenBody

            # Check if the token contains all necessary fields

            if (-not $token.token_type -or -not $token.access_token -or -not $token.expires_in) {

                throw "Token retrieval was successful but did not contain all necessary fields (token_type, access_token, expires_in)."

            }

        }

        catch {

            if ($_.Exception.Response) {

                $statusCode = $_.Exception.Response.StatusCode.value__

                $statusDescription = $_.Exception.Response.StatusDescription

                $errorMsg = "Error: Response status code does not indicate success: $statusCode ($statusDescription).`nURI: $global:tokenUri"

            }

            else {

                $errorMsg = "Error: $($_.Exception.Message)`nURI: $global:tokenUri"

            }

            Write-Error $errorMsg

            throw $errorMsg

        }

        # Update the headers with the Authorization token for subsequent requests

        $global:WUGBearerHeaders["Authorization"] = "$($token.token_type) $($token.access_token)"

        # Store the token expiration

        $global:expiry = (Get-Date).AddSeconds($token.expires_in)

        # Store the refresh token

        $global:WUGRefreshToken = $token.refresh_token

    }

    end {

        # Output connection status and return the token details

        return "Connected to ${serverUri} to obtain authorization token for user `"${Username}`" which expires at ${global:expiry} UTC."

    }

}

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