Visual FoxPro

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

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LOCAL lnSuccess
LOCAL loJws
LOCAL lcJwsCompact
LOCAL loJson

lnSuccess = 0

loJws = CreateObject('Chilkat.Jws')

*  Load the JWS compact serialization.
lcJwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
lnSuccess = loJws.LoadJws(lcJwsCompact)
IF (lnSuccess = 0) THEN
    ? loJws.LastErrorText
    RELEASE loJws
    CANCEL
ENDIF

*  Copy the decoded protected header of signature 0 into a JsonObject.
loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loJws.GetProtectedH(0,loJson)
IF (lnSuccess = 0) THEN
    ? loJws.LastErrorText
    RELEASE loJws
    RELEASE loJson
    CANCEL
ENDIF

loJson.EmitCompact = 0
? loJson.Emit()

RELEASE loJws
RELEASE loJson