XurrentAPITools

0.1.2.0

Functions_v7/ConvertFrom-XurrentWebHookPayload.ps1

                                function ConvertFrom-XurrentWebHookPayload

{    

<#

.SYNOPSIS

    Decodes and optionally verifies a Xurrent webhook payload (JWT).

.DESCRIPTION

    Processes the JSON payload of an incoming Xurrent webhook. Decodes the JWT token

    (header, payload, signature), converts Unix timestamps to DateTime objects and

    determines the Xurrent environment from the issuer URL.

    Optionally the JWT signature can be verified using a public RSA key (RS256).

    The function returns a structured object containing all relevant webhook information.

.PARAMETER PayloadString

    The raw webhook payload as a JSON string. Mandatory in parameter set 'string'.

.PARAMETER PayloadPath

    Path to a file containing the webhook payload. Mandatory in parameter set 'path'.

.PARAMETER CertPublicKey

    Optional Base64-encoded public RSA key for signature verification.

.OUTPUTS

    PSCustomObject with the properties: Header, Payload, Signature, Environment, Region, Account.

.EXAMPLE

    $result = ConvertFrom-XurrentWebHookPayload -PayloadString $rawJson

    Decodes a webhook payload without signature verification.

.EXAMPLE

    $result = ConvertFrom-XurrentWebHookPayload -PayloadPath 'C:\webhooks\payload.json' `

        -CertPublicKey $pubKeyBase64

    Loads the payload from a file and verifies the signature.

.NOTES

    Requires PowerShell 7.2+.

    The properties Payload.exp, Payload.nbf and Payload.iat are returned as DateTime.

#>

    [CmdletBinding(DefaultParameterSetName = 'string')]

    param (

        [Parameter(Mandatory = $true, ParameterSetName = 'string', Position = 0)]

        [string]$PayloadString,

        [Parameter(Mandatory = $true, ParameterSetName = 'path', Position = 0)]

        [string]$PayloadPath,

        [Parameter(Mandatory = $false, ParameterSetName = 'string', Position = 1)]

        [Parameter(Mandatory = $false, ParameterSetName = 'path', Position = 1)]

        [string]$CertPublicKey

    )

    Write-Verbose -Message "ParameterSetName $($PSCmdlet.ParameterSetName)"

    if ($PSCmdlet.ParameterSetName -eq 'path')

    {

        $PayloadString = get-content $PayloadPath

    }

    try

    {

        $payloadJson = $PayloadString | ConvertFrom-Json

        $tokenParts = $payloadJson.jwt -split '\.'

        $headerEncoded = $tokenParts[0]

        $payloadEncoded = $tokenParts[1]

        $signatureEncoded = $tokenParts[2]

        while ($headerEncoded.Length % 4) { Write-Debug -Message "Invalid length for a Base-64 char array or string, adding ="; $headerEncoded += "=" }

        while ($payloadEncoded.Length % 4) { Write-Debug -Message "Invalid length for a Base-64 char array or string, adding ="; $payloadEncoded += "=" }

        while ($signatureEncoded.Length % 4) { Write-Debug -Message "Invalid length for a Base-64 char array or string, adding ="; $signatureEncoded += "=" }

        $HeaderObj = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String(($headerEncoded).Replace('_', '/').Replace('-', '+'))) | ConvertFrom-Json

        if ($headerObj.typ -ne 'JWT')

        {

            Write-Error 'payload is not a jwt' -ErrorAction Stop

        }

        $PayloadObj = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String(($payloadEncoded).Replace('_', '/').Replace('-', '+'))) | ConvertFrom-Json -DateKind string

        $PayloadObj.exp = (Get-Date 01.01.1970).AddSeconds($PayloadObj.exp)

        $PayloadObj.nbf = (Get-Date 01.01.1970).AddSeconds($PayloadObj.nbf)

        $PayloadObj.iat = (Get-Date 01.01.1970).AddSeconds($PayloadObj.iat)

        if (-not [string]::IsNullOrEmpty($CertPublicKey))

        {

            if ($headerObj.alg -ne 'RS256')

            {

                Write-Error 'alg not RS256 as expected' -ErrorAction Stop

            }

            # Decoding Base64url to the original byte array

            $signatureBytes = [Convert]::FromBase64String(($signatureEncoded).Replace('_', '/').Replace('-', '+'))

            # Decode Base64 PEM key

            $publicKeyBytes = [Convert]::FromBase64String($CertPublicKey)

            # Create RSA Key

            $rsa = [System.Security.Cryptography.RSA]::Create()

            $rsa.ImportSubjectPublicKeyInfo($publicKeyBytes, [ref]0)

            # Verify the Signature

            $sha256 = New-Object System.Security.Cryptography.SHA256CryptoServiceProvider

            # Computing SHA-256 hash of the JWT parts 1 and 2 - header and payload

            $computed = $SHA256.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($tokenParts[0] + "." + $tokenParts[1]))

            # Decoding Base64url to the original byte array

            $signed = $tokenParts[2].replace('-', '+').replace('_', '/')

            while ($signed.Length % 4) { Write-Debug -Message "Invalid length for a Base-64 char array or string, adding ="; $signed += "=" }

            $bytes = [Convert]::FromBase64String($signed) # Conversion completed

            $SignatureObj = [PSCustomObject]::new(@{

                    isValid   = $rsa.VerifyHash($computed, $bytes, [System.Security.Cryptography.HashAlgorithmName]::SHA256, [System.Security.Cryptography.RSASignaturePadding]::Pkcs1)

                    PublcKey  = $CertPublicKey

                    Signature = $signatureEncoded

                })

        }

        $XurrentEnvironment = Find-XurrentEnvironment -AccountURL $PayloadObj.iss

        $Obj = [PSCustomObject]::new(@{

                Header        = $HeaderObj

                Payload        = $PayloadObj

                Signature   = $SignatureObj

                Environment = $XurrentEnvironment.Environment

                Region        = $XurrentEnvironment.Region

                Account        = $PayloadObj.data.account_id

            })

        return $Obj

    }

    catch

    {

        Write-Error $_

        return

    }

}

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