Format-IpAddress.ps1

function Format-IPAddress {
<#
.SYNOPSIS
 
Formats a given string IPv4 address with either leading or non-leading zeros.
 
 
.DESCRIPTION
 
Formats a given string IPv4 address with either leading or non-leading zeros.
Optionally the given address is validated.
 
 
.INPUTS
 
Either an IPv4 address in string format or an array of IPv4 addresses in string format.
 
 
.OUTPUTS
 
[string]
Either an IPv4 address in string format or an array of IPv4 addresses in string format.
 
 
.EXAMPLE
 
Format-IPAddress "10.001.001.001"
10.1.1.1
 
Formats the specified address to RFC compliant address format.
 
 
.EXAMPLE
 
'1.1.1.1','2.2.2.2' | Format-IPAddress -ToLeadingZero
001.001.001.001
002.002.002.002
 
Formats the specified addresses to zero-padded addresses.
 
 
.LINK
 
Online Version: http://dfch.biz/biz/dfch/PS/System/Utilities/Format-IPAddress/
 
 
.NOTES
 
See module manifest for required software versions and dependencies at:
http://dfch.biz/biz/dfch/PS/System/Utilities/biz.dfch.PS.System.Utilities.psd1/
 
 
#>

[CmdletBinding(
    SupportsShouldProcess = $true
    ,
    ConfirmImpact = "Low"
    ,
    DefaultParameterSetName = 'short'
    ,
    HelpURI='http://dfch.biz/PS/System/Utilities/Format-IPAddress/'
)]
Param 
(
    # Specifies the IPv4 address to convert
    [Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 0)]
    [ValidateNotNullOrEmpty()]
    [alias("ip")]
    [alias("IPv4")]
    [alias("IPAddress")]
    $InputObject
    ,
    # Specifies if the address should formatted with leading zeros, e.g. '010.001.001.001'
    [Parameter(Mandatory = $false, ParameterSetName = 'zero')]
    [alias("zero")]
    [alias("WithLeadingZero")]
    [switch] $ToLeadingZero = $true
    ,
    # Specifies if the address should formatted without leading zeros, e.g. '10.1.1.1'
    [Parameter(Mandatory = $false, ParameterSetName = 'short')]
    [alias("short")]
    [alias("NoLeadingZero")]
    [switch] $ToRfcFormat = $true
    ,
    # Specifies if the given address should be validated
    [Parameter(Mandatory = $false)]
    [switch] $Validate = $true
)

BEGIN 
{
    $datBegin = [datetime]::Now;
    [string] $fn = $MyInvocation.MyCommand.Name;
    $OutputParameter = $null;
    Log-Debug -fn $fn -msg ("CALL. InputObject.Count: '{0}'" -f $InputObject.Count) -fac 1;
}

PROCESS
{
    foreach($Object in $InputObject)
    {
        if(!$PSCmdlet.ShouldProcess($Object))
        {
            continue;
        }
        $IpAddress = $Object;
        $fReturn = $IpAddress -match '^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$';
        if(!$fReturn) 
        {
            $IpAddressShort = $null;
        } 
        else 
        {
            $IpAddressShort = '{0}.{1}.{2}.{3}' -f ($Matches[1] -as [int]), ($Matches[2] -as [int]), ($Matches[3] -as [int]), ($Matches[4] -as [int]);
        } # if

        if($PSCmdlet.ParameterSetName -eq 'short') 
        { 
            $OutputParameter = $IpAddressShort;
        } 
        else 
        {
            $fReturn = $IpAddressShort -match '^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$';
            if(!$fReturn) 
            {
                $IpAddressZero = $null;
            } 
            else 
            {
                $IpAddressZero = '{0}.{1}.{2}.{3}' -f ($Matches[1] -as [int]).ToString('000'), ($Matches[2] -as [int]).ToString('000'), ($Matches[3] -as [int]).ToString('000'), ($Matches[4] -as [int]).ToString('000');
            } # if
            $OutputParameter = $IpAddressZero;
        } # if

        if($Validate) 
        {
            [IPAddress] $ip = $IpAddressShort;
            if($ip.IPAddressToString -ne $IpAddressShort) 
            {
                $OutputParameter = $null;
            } # if
        } # if
        $OutputParameter;
    }
}
# PROCESS

END
{
    $datEnd = [datetime]::Now;
    Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;
}
#END

} # function

if($MyInvocation.ScriptName) { Export-ModuleMember -Function Format-IPAddress; }

#
# Copyright 2014-2015 d-fens GmbH
#
# 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.
#

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