Creates an HTML snapshot report from the specified vSphere/vCenter server.

Get-VMwareSnapshots.ps1

<#
####################################################################################
#  
#  Author:         Lucas Halbert <contactme@lhalbert.xyz>
#  Date Written:   4/24/2018
#  Date Modified:  04/08/2019
#  Version:        2019.04.08
#  Description:    Creates an HTML snapshot report from the specified
#                  vSphere/vCenter server. This script requires that the VMware
#                  PowerCLI module to be installed and loaded.
#  Note:           If connecting to vCenter fails with an "Error: Invalid server
#                  certificate" error, run the command 'Set-PowerCLIConfiguration 
#                  -InvalidCertificateAction Prompt' in order to prompt for user
#                  verification on self-signed/invalid certificates.
#  License:        BSD 3-Clause License
#
#  Copyright (c) 2018, Lucas Halbert
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#
#  * Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
#  * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and#or other materials provided with the distribution.
#
#  * Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
#  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
#  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
#  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
#  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
####################################################################################
#
#  Revisions:   2019.04.08 - Add function to check for pre-requisites.
#
#               2018.11.15 - Add parameters for server and filename
#
#               2018.10.30 - functionalize all commands in script and fix styling
#
#               2018.04.24 - Inital draft
#
####################################################################################    
#>

# Gather paramters
param(
    [Parameter(Mandatory=$true)][string]$server,
    [Parameter(Mandatory=$true)][string]$filename
)

# Define function to convert HTML Escapes
Function Convert-HTMLEscape {
	<#
	convert &lt; and &gt; to < and > It is assumed that these will be in pairs
	#>
	[cmdletbinding()]
		Param (
			[Parameter(Position=0,ValueFromPipeline=$True)]
			[string[]]$Text
		)
	Process {
		foreach ($item in $text) {
			if ($item -match "&lt;") {
				(($item.Replace("&lt;","<")).Replace("&gt;",">")).Replace("&quot;",'"')
			} Else {
				#otherwise just write the line to the pipeline
				$item
			}
		}
	}
}

# Define function to set alternating rows
Function Set-AlternatingRows {
    [CmdletBinding()]
        Param(
            [Parameter(Mandatory=$True,ValueFromPipeline=$True)]
            [string]$Line,
            [Parameter(Mandatory=$True)]
            [string]$CSSEvenClass,
            [Parameter(Mandatory=$True)]
            [string]$CSSOddClass
        )
    Begin {
        $ClassName = $CSSEvenClass
    }
    Process {
        If ($Line.Contains("<tr>")) {
			$Line = $Line.Replace("<tr>","<tr class=""$ClassName"">")
            If ($ClassName -eq $CSSEvenClass) {
				$ClassName = $CSSOddClass
            } Else {
				$ClassName = $CSSEvenClass
            }
        }
        Return $Line
    }
}

# Function to set style
Function Set-Style {    
    # Define all Style tags
    $style = "<style>
    TABLE{border-width: 1px;border-style: solid;border-color:black;}
    TABLE{background-color:#EFFFFF;border-collapse: collapse;}
    TH{border-width:1px;padding:5px;border-style:solid;border-color:black;background-color:#DDDDDD;}
    TD{border-width:1px;padding-left:5px;padding-right:3px;border-style:solid;border-color:black;}
    .odd { background-color:#ccddee;}
    .even { background-color:#eeeeff;}
    </style>"
    Return $style
}

Function Get-SnapshotData {
    $style = Set-Style
    Get-VM | ForEach {
        $vm = $_
        $_ | Get-Snapshot | Select @{Label="Host";Expression={$vm.VMHost}},VM,Name,Description,@{Label="Size";Expression={"{0:N2} GB" -f ($_.SizeGB)}},Created | Select Host,VM,Name,Description,Size,Created 
    }  | ConvertTo-Html -Head $style -PreContent "<p><h2>Snapshot Report - $server</h2></p><br>" | Set-AlternatingRows -CSSEvenClass even -CSSOddClass odd | Convert-HTMLEscape | Out-File $filename
}

Function Connect-vCenter($server) {
    # Connect to vCenter
    Write-Host -NoNewline "Connecting to vCenter..."
    Connect-VIServer $server -Protocol https |out-null
    if(!$?){
        Write-Host -ForegroundColor Red "Could not connect to $server"
        exit 2
    } else {
        Write-Host "Connected to vCenter host"
        Get-SnapshotData
    }
}

Function Check-PreRequisites() {
    # Check if VMware.PowerCLI module is available for import (ie: installed)
    if (!(Get-Module -ListAvailable -Name VMware.PowerCLI)) {
        Write-Host -ForegroundColor Yellow "This script requires the VMware.PowerCLI Module to be installed."
        Write-Host -ForegroundColor Yellow "Please install the module by running the command 'Install-Module -Name VMware.PowerCLI -Scope CurrentUser'"
        Return $false
    # Check if Vmware.PowerCLI module is loaded
    } elseif (!(Get-Module -Name VMware.PowerCLI)) {
        Write-Host -ForegroundColor Yellow "This script requires the VMware.PowerCLI Module to be loaded."
        Write-Host -ForegroundColor Yellow "Please load the module by running 'Import-Module VMware.PowerCLI -Verbose'"
        Return $false
    } elseif (Get-Module -Name VMware.PowerCLI) {
        Return $true
    } else {
        Return $false
    }
}

# Check if pre-requisites are met
if (!(Check-PreRequisites)) { exit 3 }

if (!$global:DefaultVIServers.Count -gt 0) {
    Write-Host "Connecting to $server"
    Connect-vCenter $server
} elseif (!$global:DefaultVIServer[0].name.Equals($server)) {
    Write-Host "Connecting to $server"
    Connect-vCenter $server
} else {
    Write-Host "Fetching snapshot data"
    Get-SnapshotData
}