Functions/Show-EncodedJwt.ps1
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function Show-EncodedJwt { <# .SYNOPSIS Displays an encoded JWT with the individual parts in color. .DESCRIPTION Displays an encoded JWT with the individual parts in color for easy viewing. Note that this advanced function is not meant to send any data and/or objects down the pipeline. .PARAMETER JsonWebToken The JSON Web Token to be displayed. .EXAMPLE $jwt = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6IjJ5Q3Zabms3azhXNjZ3UjJMWFI5V0Nzd2hBYyIsImtpZCI6IjJ5Q3Zabms3azhXNjZ3UjJMWFI5V0Nzd2hBYyJ9.eyJpYXQiOjE2MTgyNTAzODksIm5iZiI6MTYxODI1MDM4OSwiZXhwIjoxNjE4MjU1MTg5LCJzdWIiOiJ0b255In0.X-RZm-3Hto5U-8Q-Wp1ggqWTFPkO5-Cz9lzoKsH5-1RR9GOrGPuWn-bjIv1YJ46h5Bw-KpiX-dOS47TAq2A0BWdAwczLVA6pzha1WswkT_u3cO1_KSoOjD9qFLjCgk-ns7A48iXpNcOoPBFXgfx8G0rRK68sSnokJ7N2NH-YNUOjg3U7DNJ_-iz8WZ5dNlOvpDsTy0BHMX-lho18sUmakUNpadJr-oD7BXIp--Z57UERBFibppaoxseYRo3VfmhgHibTxP-39mcxU6sH9a99fEEt80hj4w6rZobRxZV-pFPS22B8TBAfVf8L9faMLaXmgV7xtQohqQZgL6oKdJzFPQ" $jwt | Show-EncodedJwt Displays an encoded JSON Web Token with the header in red, the body in cyan, and green for the signature. .INPUTS System.String A string is received by the JsonWebToken parameter. .OUTPUTS None This cmdlet returns no output. It sends the objects to the host. The host displays the objects this cmdlet sends to it. .LINK https://tools.ietf.org/html/rfc7519 #> [CmdletBinding()] [OutputType([System.Boolean])] Param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 0)] [ValidateLength(16, 131072)][Alias("JWT", "Token")][String]$JsonWebToken ) BEGIN { $decodeExceptionMessage = "Unable to decode JWT." $ArgumentException = New-Object -TypeName ArgumentException -ArgumentList $decodeExceptionMessage } PROCESS { [bool]$hasValidJwtStructure = Test-JwtStructure -JsonWebToken $JsonWebToken -VerifySignaturePresent if (-not($hasValidJwtStructure)) { Write-Error -Exception $ArgumentException -Category InvalidArgument -ErrorAction Stop } # Get the header, payload, and signature as their already encoded strings: $header = Get-JsonWebTokenHeader -JsonWebToken $JsonWebToken -AsEncodedString $payload = Get-JsonWebTokenPayload -JsonWebToken $JsonWebToken -AsEncodedString $signature = Get-JsonWebTokenSignature -JsonWebToken $JsonWebToken -AsEncodedString # Write each of the three JWT parts seperated by periods: Write-Host -Object "" Write-Host -Object $header -ForegroundColor Red -NoNewline Write-Host -Object "." -ForegroundColor Yellow -NoNewline Write-Host -Object $payload -ForegroundColor Cyan -NoNewline Write-Host -Object "." -ForegroundColor Yellow -NoNewline Write-Host -Object $signature -ForegroundColor Green Write-Host -Object "" } } |