Functions/ConvertTo-Base64.ps1

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function ConvertTo-Base64
{
    <#
    .SYNOPSIS
    Converts a value to base-64 encoding.
     
    .DESCRIPTION
    For some reason. .NET makes encoding a string a two-step process. This function makes it a one-step process.
     
    You're actually allowed to pass in `$null` and an empty string. If you do, you'll get `$null` and an empty string back.
 
    .LINK
    ConvertFrom-Base64
     
    .EXAMPLE
    ConvertTo-Base64 -Value 'Encode me, please!'
     
    Encodes `Encode me, please!` into a base-64 string.
     
    .EXAMPLE
    ConvertTo-Base64 -Value 'Encode me, please!' -Encoding ([Text.Encoding]::ASCII)
     
    Shows how to specify a custom encoding in case your string isn't in Unicode text encoding.
     
    .EXAMPLE
    'Encode me!' | ConvertTo-Base64
     
    Converts `Encode me!` into a base-64 string.
    #>

    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [AllowNull()]
        [AllowEmptyString()]
        [string[]]
        # The value to base-64 encoding.
        $Value,
        
        [Text.Encoding]
        # The encoding to use. Default is Unicode.
        $Encoding = ([Text.Encoding]::Unicode)
    )
    
    begin
    {
        Set-StrictMode -Version 'Latest'

        Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState    
    }

    process
    {
        $Value | ForEach-Object {
            if( $_ -eq $null )
            {
                return $null
            }
            
            $bytes = $Encoding.GetBytes($_)
            [Convert]::ToBase64String($bytes)
        }
    }
}