Automate PowerCLI connection to vCenter

AutoConnect-VIServer.ps1

# Automated PowerCLI connections to vCenter Server
# Script will use stored PSCredentials if user is unprivileged
function AutoConnect-VIServer () {
    Param(
        [string]$server = 'vcenter'
    )

    # Check if user is in a group with vCenter permissions
    if ([System.Security.Principal.WindowsIdentity]::GetCurrent().Groups.Translate(
            [System.Security.Principal.NTAccount]) -contains 'DOMAIN\vCenter_Admins') {
        # Connect to vCenter using existing user token
        [void](Connect-VIServer (Resolve-DnsName $server).Name)
    }
    else {
        # PSCredentials are unique per (user,machine) pair, so the filename changes too
        $filePath = $env:APPDATA + '\' + ((
                [System.Security.Cryptography.HashAlgorithm]::Create('SHA1').ComputeHash(
                    [System.Text.Encoding]::UTF8.GetBytes("$env:USERNAME,$env:COMPUTERNAME")
                ) | ForEach-Object { $_.tostring('x2') }
            ).toupper() -join '')

        if (!(Test-Path $filePath)) {
            # Save PSCredential to file if it doesn't exist
            $cred = Get-Credential -Message 'Enter credentials for VMWare Admin:'
            $cred.UserName, ($cred.Password | ConvertFrom-SecureString) -join ',' |
                Out-File $filePath
        }
        if (!$cred) {
            # Load PSCredential from file
            $user, $pass = (Get-Content $filePath).Split(',')
            $cred = [System.Management.Automation.PSCredential]::new(
                $user, (ConvertTo-SecureString $pass)
            )
        }
        # Connect to vCenter using stored PSCredential
        [void](Connect-VIServer (Resolve-DnsName $server).Name -Credential $cred)
        $filePath, $user, $pass, $cred = $null
    }
}

Updated version available in my HelperFunctions module.