internal/functions/Core/ConvertFrom-JWTtoken.ps1
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function ConvertFrom-JWTtoken { <# .SYNOPSIS Converts access tokens to readable objects .DESCRIPTION Converts access tokens to readable objects .PARAMETER Token The Token to convert .EXAMPLE PS C:\> ConvertFrom-JWTtoken -Token $Token Converts the content from variable $token to an object #> [cmdletbinding()] param( [Parameter(Mandatory = $true)] [string] $Token ) # Validate as per https://tools.ietf.org/html/rfc7519 - Access and ID tokens are fine, Refresh tokens will not work if ((-not $Token.Contains(".")) -or (-not $Token.StartsWith("eyJ"))) { $msg = "Invalid data or not an access token. $($Token)" Stop-PSFFunction -Message $msg -Tag "JWT" -EnableException $true -Exception ([System.Management.Automation.RuntimeException]::new($msg)) } # Split the token in its parts $tokenParts = $Token.Split(".") # Work on header $tokenHeader = [System.Text.Encoding]::UTF8.GetString( (ConvertFrom-Base64StringWithNoPadding $tokenParts[0]) ) $tokenHeaderJSON = $tokenHeader | ConvertFrom-Json # Work on payload $tokenPayload = [System.Text.Encoding]::UTF8.GetString( (ConvertFrom-Base64StringWithNoPadding $tokenParts[1]) ) $tokenPayloadJSON = $tokenPayload | ConvertFrom-Json # Work on signature $tokenSignature = ConvertFrom-Base64StringWithNoPadding $tokenParts[2] # Output $resultObject = [PSCustomObject]@{ "Header" = $tokenHeader "Payload" = $tokenPayload "Signature" = $tokenSignature "Algorithm" = $tokenHeaderJSON.alg "Type" = $tokenHeaderJSON.typ "JwtId" = [guid]::Parse($tokenPayloadJSON.jti) "Issuer" = $tokenPayloadJSON.iss "Scope" = $tokenPayloadJSON.scope "IssuedUTC" = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.iat).ToUniversalTime() "ExpiresUTC" = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.exp).ToUniversalTime() "NotBeforeUTC" = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.nbf).ToUniversalTime() "ClientId" = $tokenPayloadJSON.sub "Prv" = $tokenPayloadJSON.prv } #$output $resultObject } |