PSGSuite

2.11.0

Private/Convert-Base64.ps1

function Convert-Base64 {
    [cmdletbinding()]
    Param
    (
        [parameter(Mandatory = $true,Position = 0)]
        [ValidateSet("NormalString","Base64String","WebSafeBase64String")]
        [ValidateScript( {if ($_ -eq $To) {
                    throw "The 'From' parameter must not be the same as the 'To' parameter"
                }
                else {
                    $true
                }})]
        [String]
        $From,
        [parameter(Mandatory = $true,Position = 1)]
        [ValidateSet("NormalString","Base64String","WebSafeBase64String")]
        [ValidateScript( {if ($_ -eq $From) {
                    throw "The 'To' parameter must not be the same as the 'From' parameter"
                }
                else {
                    $true
                }})]
        [String]
        $To,
        [parameter(Mandatory = $true,Position = 2,ValueFromPipeline = $true)]
        [String]
        $String,
        [parameter(Mandatory = $false)]
        [String]
        $OutFile
    )
    if ($From -eq "NormalString") {
        $String = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($String))
    }
    elseif ($From -eq "WebSafeBase64String") {
        $String = $String.Replace('_', '/').Replace('-', '+').Replace('|','=')
        switch ($String.Length % 4) {
            2 {
                $String += "=="
            }
            3 {
                $String += "="
            }
        }
    }
    if ($To -eq "NormalString") {
        $String = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($String))
    }
    elseif ($To -eq "WebSafeBase64String") {
        $String = $String.TrimEnd("=").Replace('+', '-').Replace('/', '_');
    }
    if ($OutFile) {
        $String | Set-Content $OutFile -Force
    }
    else {
        return $String
    }
}