Functions/Get-JsonWebTokenPayload.ps1
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function Get-JsonWebTokenPayload { <# .SYNOPSIS Gets the JSON Web Token payload from the passed JWT. .DESCRIPTION Deserializes a JSON Web Token payload to a System.Collections.HashTable by default. Optionally a string (base 64 encoded or JSON) is returned depending on parameters chosen. .PARAMETER JsonWebToken Specifies the The JSON Web Token to get the payload from. .PARAMETER AsEncodedString Returns the payload as a base 64 URL encoded string. .PARAMETER AsJson Returns the payload as a JSON string. .EXAMPLE $jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.VG6H-orYnMLknmJajHx1HW9SftqCWeqE3TQ1UArx3Mk" Get-JsonWebTokenPayload -JsonWebToken $jwt Returns the payload from the passed JWT as a Hashtable. .EXAMPLE $jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.VG6H-orYnMLknmJajHx1HW9SftqCWeqE3TQ1UArx3Mk" Get-JsonWebTokenPayload -JsonWebToken $jwt -AsEncodedString Returns the encoded payload from the passed JWT. .EXAMPLE $jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.VG6H-orYnMLknmJajHx1HW9SftqCWeqE3TQ1UArx3Mk" Get-JsonWebTokenPayload -JsonWebToken $jwt -AsJson Returns the decoded payload from the passed JWT. .INPUTS System.String A String is received by the JsonWebToken parameter. .OUTPUTS System.Collections.Hashtable or System.String .LINK New-JsonWebToken Test-JsonWebToken Get-JsonWebTokenHeader Get-JsonWebTokenSignature #> [CmdletBinding(DefaultParameterSetName="Default")] [OutputType([System.Collections.Hashtable],ParameterSetName="Default")] [OutputType([System.String],ParameterSetName="Base64")] [OutputType([System.String],ParameterSetName="JSON")] Param ( [Parameter(ParameterSetName="Base64")] [Parameter(ParameterSetName="JSON")] [Parameter(ParameterSetName="Default",Mandatory=$true,ValueFromPipeline=$true,Position=0)] [ValidateLength(16,8192)][Alias("JWT", "Token")][String]$JsonWebToken, [Parameter(ParameterSetName="Base64",Mandatory=$true, ValueFromPipeline=$false, ValueFromPipelineByPropertyName=$false,Position=1)][Alias("AsIs")][switch]$AsEncodedString, [Parameter(ParameterSetName="JSON",Mandatory=$true, ValueFromPipeline=$false, ValueFromPipelineByPropertyName=$false,Position=1)][switch]$AsJson ) BEGIN { $decodeExceptionMessage = "Unable to decode JWT." $ArgumentException = New-Object -TypeName ArgumentException -ArgumentList $decodeExceptionMessage } PROCESS { [bool]$isValidJwt = Test-JwtStructure -JsonWebToken $JsonWebToken if (-not($isValidJwt)) { Write-Error -Exception $ArgumentException -Category InvalidArgument -ErrorAction Stop } $jwtPayload = $JsonWebToken.Split(".")[1] if ($PSBoundParameters.ContainsKey("AsEncodedString")) { return $jwtPayload } elseif ($PSBoundParameters.ContainsKey("AsJson")) { return $jwtPayload | ConvertFrom-Base64UrlEncodedString } else { [System.Collections.Hashtable]$jwtPayloadTable = $jwtPayload | ConvertFrom-Base64UrlEncodedString | ConvertFrom-Json | Convert-PSObjectToHashTable return $jwtPayloadTable } } } |