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 = New-Object MSGraph.Core.JWTAccessTokenInfo $resultObject.Header = $tokenHeader $resultObject.Payload = $tokenPayload $resultObject.Signature = $tokenSignature $resultObject.Algorithm = $tokenHeaderJSON.alg $resultObject.Type = $tokenHeaderJSON.typ if ($tokenPayloadJSON.appid) { $resultObject.ApplicationID = $tokenPayloadJSON.appid } $resultObject.ApplicationName = $tokenPayloadJSON.app_displayname $resultObject.Audience = $tokenPayloadJSON.aud $resultObject.AuthenticationMethod = $tokenPayloadJSON.amr $resultObject.ExpirationTime = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.exp).ToUniversalTime() $resultObject.GivenName = $tokenPayloadJSON.given_name $resultObject.IssuedAt = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.iat).ToUniversalTime() $resultObject.Name = $tokenPayloadJSON.name $resultObject.NotBefore = ([datetime]"1970-01-01Z00:00:00").AddSeconds($tokenPayloadJSON.nbf).ToUniversalTime() if ($tokenPayloadJSON.oid) { $resultObject.OID = $tokenPayloadJSON.oid } $resultObject.Plattform = $tokenPayloadJSON.platf $resultObject.Scope = $tokenPayloadJSON.scp $resultObject.SID = $tokenPayloadJSON.onprem_sid $resultObject.SourceIPAddr = $tokenPayloadJSON.ipaddr $resultObject.SureName = $tokenPayloadJSON.family_name $resultObject.TenantID = $tokenPayloadJSON.tid $resultObject.UniqueName = $tokenPayloadJSON.unique_name $resultObject.UPN = $tokenPayloadJSON.upn $resultObject.Version = $tokenPayloadJSON.ver #$output $resultObject } |