internal/functions/getJWTDetails.ps1
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function getJWTDetails { <# .SYNOPSIS Output JWT Token details .DESCRIPTION Output JWT Token details .PARAMETER token token .EXAMPLE PS C:\> getJWTDetails Get Token #> [cmdletbinding()] param( [Parameter(Mandatory = $true, Position = 0)] [string]$token ) if (!$token -contains (".") -or !$token.StartsWith("eyJ")) { Write-Error "Invalid token" -ErrorAction Stop } #Token foreach ($i in 0..1) { $data = $token.Split('.')[$i].Replace('-', '+').Replace('_', '/') switch ($data.Length % 4) { 0 { break } 2 { $data += '==' } 3 { $data += '=' } } } $decodedToken = [System.Text.Encoding]::UTF8.GetString([convert]::FromBase64String($data)) | ConvertFrom-Json Write-Verbose "JWT Token:" Write-Verbose $decodedToken #Signature foreach ($i in 0..2) { $sig = $token.Split('.')[$i].Replace('-', '+').Replace('_', '/') switch ($sig.Length % 4) { 0 { break } 2 { $sig += '==' } 3 { $sig += '=' } } } Write-Verbose "JWT Signature:" Write-Verbose $sig $decodedToken | Add-Member -Type NoteProperty -Name "sig" -Value $sig #Convert Expiry time to PowerShell DateTime $orig = (Get-Date -Year 1970 -Month 1 -Day 1 -hour 0 -Minute 0 -Second 0 -Millisecond 0) $timeZone = Get-TimeZone $utcTime = $orig.AddSeconds($decodedToken.exp) $offset = $timeZone.GetUtcOffset($(Get-Date)).TotalMinutes #Daylight saving needs to be calculated $localTime = $utcTime.AddMinutes($offset) # Return local time, $decodedToken | Add-Member -Type NoteProperty -Name "expiryDateTime" -Value $localTime #Time to Expiry $timeToExpiry = ($localTime - (get-date)) $decodedToken | Add-Member -Type NoteProperty -Name "timeToExpiry" -Value $timeToExpiry return $decodedToken } |