public/Format-JWT.ps1
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<#
.SYNOPSIS The command parses JWT token from input or pipeline. .DESCRIPTION The command parses JWT token from input or pipeline; Once parsed, it can either output a psobject or JSON. Do not use for validation as the signature is removed. .PARAMETER Text Input text necessary for parsing Default value: None Mandatory: Yes (accepts also pipeline passing) .PARAMETER AsJson If this switch is present it will output the parsed JWT token as JSON. Default value: None Mandatory: No .NOTES Author : Martin Rublik (martin.rublik@bspc.sk) Created : 2023-10-04 Version : 1.0 Changelog: V 1.0 (2023-10-24) - intial version License: The MIT License (MIT) Copyright (c) 2016 Martin Rublik Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. .EXAMPLE $token.access_token | Format-JWT -AsJson Parse access_token and output it as formated JSON. #> function Format-JWT { param( ## Text of an XML document. [Parameter(ValueFromPipeline = $true,Mandatory=$true)] [string[]]$Text, [Parameter(ValueFromPipeline = $false,Mandatory=$false)] [switch]$AsJson ) $parts=$Text.Split(".") if ($parts.Count -ne 3) { throw "Inccorect JWT, expacting three b64 strings seperated by '.'" } # pad parts for($i=0;$i -lt 2;$i++) { $len=$parts[$i].Length if ($len % 4 -eq 2) {$parts[$i]=$parts[$i]+"=="} if ($len % 4 -eq 3) {$parts[$i]=$parts[$i]+"="} } $result= New-Object psobject try { $toDecode=$parts[0] $header=$toDecode | Base64-To-String | ConvertFrom-Json $result | Add-Member -MemberType NoteProperty Header -Value $header -Force }catch { throw "Error decoding JWT header: $($_.exception.message)" } try { $toDecode=$parts[1] $toDecodeLenMod=$toDecode.Length % 4 $payload=$toDecode | Base64-To-String | ConvertFrom-Json $result | Add-Member -MemberType NoteProperty Payload -Value $payload -Force }catch { throw "Error decoding JWT payload: $($_.exception.message)" } if ($AsJson.IsPresent) { return $result | ConvertTo-Json } $result } |