MSIdentityTools

1.1.4

ConvertFrom-JsonWebSignature.ps1

                                <#

.SYNOPSIS

   Convert Json Web Signature (JWS) structure to PowerShell object.

.EXAMPLE

    PS C:\>$MsalToken.IdToken | ConvertFrom-JsonWebSignature

    Convert OAuth IdToken JWS to PowerShell object.

.INPUTS

    System.String

#>

function ConvertFrom-JsonWebSignature {

    [CmdletBinding()]

    [Alias('ConvertFrom-Jws')]

    [Alias('ConvertFrom-JsonWebToken')]

    [Alias('ConvertFrom-Jwt')]

    [OutputType([PSCustomObject])]

    param (

        # JSON Web Signature (JWS)

        [Parameter(Mandatory=$true, Position=0, ValueFromPipeline=$true)]

        [string[]] $InputObjects,

        # Content Type of the Payload

        [Parameter(Mandatory=$false)]

        [ValidateSet('text/plain','application/json','application/octet-stream')]

        [string] $ContentType = 'application/json'

    )

    process {

        foreach ($InputObject in $InputObjects) {

            [string[]] $JwsComponents = $InputObject.Split('.')

            switch ($ContentType) {

                'application/octet-stream' { [byte[]] $JwsPayload = $JwsComponents[1] | ConvertFrom-Base64String -Base64Url -RawBytes }

                'text/plain' { [string] $JwsPayload = $JwsComponents[1] | ConvertFrom-Base64String -Base64Url }

                'application/json' { [PSCustomObject] $JwsPayload = $JwsComponents[1] | ConvertFrom-Base64String -Base64Url | ConvertFrom-Json }

                Default { [string] $JwsPayload = $JwsComponents[1] | ConvertFrom-Base64String -Base64Url }

            }

            [PSCustomObject] $JwsDecoded = New-Object PSCustomObject -Property @{

                Header = $JwsComponents[0] | ConvertFrom-Base64String -Base64Url | ConvertFrom-Json

                Payload = $JwsPayload

                Signature = $JwsComponents[2] | ConvertFrom-Base64String -Base64Url -RawBytes

            }

            Write-Output ($JwsDecoded | Select-Object -Property Header,Payload,Signature)

        }

    }

}

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# SIG # End signature block