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DataFlex Examples

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(DataFlex) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

  • nbf: Not Before Time
  • exp: Expiration Time
  • iat: Issue At Time

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJwt
    Handle hoJose
    Boolean iSuccess
    Handle hoClaims
    Integer iCurDateTime
    String sStrJwt
    String sTemp1
    String sTemp2

    //  Demonstrates how to create an HMAC JWT using a shared secret (password).

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatJwt)) To hoJwt
    If (Not(IsComObjectCreated(hoJwt))) Begin
        Send CreateComObject of hoJwt
    End

    //  Build the JOSE header
    Get Create (RefClass(cComChilkatJsonObject)) To hoJose
    If (Not(IsComObjectCreated(hoJose))) Begin
        Send CreateComObject of hoJose
    End
    //  Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
    Get ComAppendString Of hoJose "alg" "HS256" To iSuccess
    Get ComAppendString Of hoJose "typ" "JWT" To iSuccess

    //  Now build the JWT claims (also known as the payload)
    Get Create (RefClass(cComChilkatJsonObject)) To hoClaims
    If (Not(IsComObjectCreated(hoClaims))) Begin
        Send CreateComObject of hoClaims
    End
    Get ComAppendString Of hoClaims "iss" "http://example.org" To iSuccess
    Get ComAppendString Of hoClaims "sub" "John" To iSuccess
    Get ComAppendString Of hoClaims "aud" "http://example.com" To iSuccess

    //  Set the timestamp of when the JWT was created to now.
    Get ComGenNumericDate Of hoJwt 0 To iCurDateTime
    Get ComAddIntAt Of hoClaims -1 "iat" iCurDateTime To iSuccess

    //  Set the "not process before" timestamp to now.
    Get ComAddIntAt Of hoClaims -1 "nbf" iCurDateTime To iSuccess

    //  Set the timestamp defining an expiration time (end time) for the token
    //  to be now + 1 hour (3600 seconds)
    Get ComAddIntAt Of hoClaims -1 "exp" (iCurDateTime + 3600) To iSuccess

    //  Produce the smallest possible JWT:
    Set ComAutoCompact Of hoJwt To True

    Get ComEmit Of hoJose To sTemp1
    Get ComEmit Of hoClaims To sTemp2
    Get ComCreateJwt Of hoJwt sTemp1 sTemp2 "secret" To sStrJwt

    Showln sStrJwt


End_Procedure

 

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