functions/Get-ExpiringCertificate.ps1
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function Get-ExpiringCertificate { <# .SYNOPSIS Returns the expiring certificates from a list of certificate objects .DESCRIPTION Returns the expiring certificates from a list of certificate objects .PARAMETER Certificate a list with one or more certificate objects .PARAMETER ExpireDays Defines the scope of the search in days in which the next certificates expire .EXAMPLE PS C:\$expiringCertificates = $allCertificates | Get-ExpiringCertificate -ExpireDays 90 Returns the expiring certificates of the next 90 days from a list of certificate objects #> [CmdletBinding()] param ( [Parameter(ValueFromPipeline = $true)] $Certificate, [Int] $ExpireDays ) begin { $limit = (Get-Date).AddDays($ExpireDays) $certificateHash = @{} } process { foreach ($certificateObject in $Certificate) { $certID = "{0}|{1}" -f $certificateObject.TemplateDisplayName, $certificateObject.Certificate.Subject if (-not $certificateHash[$certID]) { $certificateHash[$certID] = @() } $certificateHash[$certID] += $certificateObject } } end { foreach ($certificateSet in $certificateHash.GetEnumerator()) { # Expired if (-not($certificateSet.Value | Where-Object CertificateExpirationDate -GE (Get-Date) )){ continue } # Not Expiring (out of Scope) if ($certificateSet.Value | Where-Object CertificateExpirationDate -GE $limit){ continue } # Expiring (in Scope from now till limit) $certificateSet.Value | Where-Object CertificateExpirationDate -GE (Get-Date) } } } |