Functions/ConvertTo-JwtPart.ps1
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function ConvertTo-JwtPart { <# .SYNOPSIS Converts an object to a base 64 URL encoded compressed JSON string. .DESCRIPTION Converts an object to a base 64 URL encoded compressed JSON string. Useful when constructing a JWT header or payload from a InputObject prior to serialization. .PARAMETER InputObject Specifies the object to convert to a JWT part. Enter a variable that contains the object, or type a command or expression that gets the objects. You can also pipe an object to ConvertTo-JwtPart. .EXAMPLE $jwtHeader = @{typ="JWT";alg="HS256"} $encodedHeader = $jwtHeader | ConvertTo-JwtPart Constructs a JWT header from the hashtable defined in the $jwtHeader variable, serializes it to JSON, and base 64 URL encodes it. .EXAMPLE $header = @{typ="JWT";alg="HS256"} $payload = @{sub="someone.else@company.com";title="person"} $encodedHeader = $header | ConvertTo-JwtPart $encodedPayload = $payload | ConvertTo-JwtPart $jwtSansSignature = "{0}.{1}" -f $encodedHeader, $encodedPayload $hmacSignature = New-JwtHmacSignature -JsonWebToken $jwtSansSignature -Key "secret" $jwt = "{0}.{1}" -f $jwtSansSignature, $hmacSignature Constructs a header and payload from InputObjects, serializes and encodes them and obtains an HMAC signature from the resulting joined values. .INPUTS System.Object .OUTPUTS System.String .LINK New-JwtHmacSignature New-JsonWebToken Test-JsonWebToken #> [CmdletBinding()] [OutputType([System.String])] Param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, Position = 0)] [ValidateNotNullOrEmpty()][System.Object]$InputObject ) BEGIN { $argumentExceptionMessage = "Unable to serialize and base64 URL encode passed InputObject." $ArgumentException = New-Object -TypeName ArgumentException -ArgumentList $argumentExceptionMessage } PROCESS { [string]$base64UrlEncodedString = "" try { $base64UrlEncodedString = $InputObject | ConvertTo-Json -Depth 25 -Compress | ConvertTo-Base64UrlEncodedString } catch { Write-Error -Exception $ArgumentException -Category InvalidArgument -ErrorAction Stop } return $base64UrlEncodedString } } |