(DataFlex) Box.com OAuth2 with JSON Web Tokens

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Demonstrates how to obtain an OAuth2 access token using a JSON Web Token. The following explanation is copied from Box Authentication Models

OAuth2 with JSON Web Tokens enables an application to connect directly to Box and obtain authorization to access files and folders without requiring users to log in. Using OAuth2 with JSON Web Tokens an application can provide Box features without users even being aware that Box exists.

Instead of requiring the user to log in to Box, the application generates JSON Web Token (JWT) verified by an RSA keypair. If this authentication succeeds then the application obtains an access token that grants authorization to operate on Box files and folders. This machine-to-machine authentication replaces the first leg of the three-legged authentication process defined by OAuth2, and enables users of your application to work with Box content without seeing Box login requests.

OAuth2 with JSON Web Tokens is designed to be used with Box Platform. You can use OAuth2 with JWT with both Service Accounts and App Users.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoJsonRsaKey
    Boolean iSuccess
    String sPassphrase
    String sPrivateKeyPem
    Variant vRsaKey
    Handle hoRsaKey
    Handle hoJwt
    Handle hoJose
    Handle hoClaims
    Handle hoPrng
    Handle hoRest
    Boolean iBAutoReconnect
    String sJsonResponse
    Handle hoJResponse
    String sAccessToken
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    // When you created an RSA key pair using the Box web user interface,
    // you downloaded a json file named something like "7152782_kkdxptq2_config.json"
    // This contains the following:

    // {
    //   "boxAppSettings": {
    //     "clientID": "0kraci84o0jfr7yuw596tf394iigzbe7",
    //     "clientSecret": "xxxxxxxxxxxxxxxxxxxxxxxxx",
    //     "appAuth": {
    //       "publicKeyID": "kkdxptq2",
    //       "privateKey": "-----BEGIN ENCRYPTED PRIVATE KEY-----\nMIIFDj ... nceU=\n-----END ENCRYPTED PRIVATE KEY-----\n",
    //       "passphrase": "xxxxxxxxxxxxxxxxxxxxxxxx"
    //     }
    //   },
    //   "enterpriseID": "7152782"
    // }
    // 

    // Load it into a Chilkat JSON object to allow access to the content.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonRsaKey
    If (Not(IsComObjectCreated(hoJsonRsaKey))) Begin
        Send CreateComObject of hoJsonRsaKey
    End
    Get ComLoadFile Of hoJsonRsaKey "qa_data/tokens/7152782_kkdxptq2_config.json" To iSuccess

    // Load the private key into a Chilkat private key object.
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.appAuth.passphrase" To sPassphrase
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.appAuth.privateKey" To sPrivateKeyPem

    Get Create (RefClass(cComChilkatPrivateKey)) To hoRsaKey
    If (Not(IsComObjectCreated(hoRsaKey))) Begin
        Send CreateComObject of hoRsaKey
    End
    Get ComLoadEncryptedPem Of hoRsaKey sPrivateKeyPem sPassphrase To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsaKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The JSON Web Token will be created using the JWT class
    Get Create (RefClass(cComChilkatJwt)) To hoJwt
    If (Not(IsComObjectCreated(hoJwt))) Begin
        Send CreateComObject of hoJwt
    End

    // Construct the JOSE header...
    Get Create (RefClass(cComChilkatJsonObject)) To hoJose
    If (Not(IsComObjectCreated(hoJose))) Begin
        Send CreateComObject of hoJose
    End
    // Chilkat supports the following algorithms: "RS256", "RS384", and "RS512".  (Chilkat also supports other algorithms that Box does not yet support.)
    Get ComUpdateString Of hoJose "alg" "RS256" To iSuccess
    Get ComUpdateString Of hoJose "typ" "JWT" To iSuccess
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.appAuth.publicKeyID" To sTemp1
    Get ComUpdateString Of hoJose "kid" sTemp1 To iSuccess

    // Now let's build the JWT claims. Most of this is just boilerplate (i.e. the same every time..)
    // The JWT claims contain these required and optional elements:

    // iss (required, String)  The Client ID of the service that created the JWT assertion.
    // sub (required, String)  enterprise_id for a token specific to an enterprise when creating and managing app users, or the app user_id for a token specific to an individual app user.
    // box_sub_type (required, String)  "enterprise" or "user" depending on the type of token being requested in the sub claim.
    // aud (required, String) Always "https://api.box.com/oauth2/token" for OAuth2 token requests
    // jti (required, String) A universally unique identifier specified by the client for this JWT. This is a unique string that is at least 16 characters and at most 128 characters.
    // exp (required, NumericDate) The unix time as to when this JWT will expire. This can be set to a maximum value of 60 seconds beyond the issue time. Note: It is recommended to set this value to less than the maximum allowed 60 seconds.
    // iat (optional, NumericDate) Issued at time. The token cannot be used before this time.
    // nbf (optional, NumericDate) Not before. Specifies when the token will start being valid.
    // 

    Get Create (RefClass(cComChilkatJsonObject)) To hoClaims
    If (Not(IsComObjectCreated(hoClaims))) Begin
        Send CreateComObject of hoClaims
    End
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.clientID" To sTemp1
    Get ComUpdateString Of hoClaims "iss" sTemp1 To iSuccess
    Get ComStringOf Of hoJsonRsaKey "enterpriseID" To sTemp1
    Get ComUpdateString Of hoClaims "sub" sTemp1 To iSuccess
    Get ComUpdateString Of hoClaims "box_sub_type" "enterprise" To iSuccess
    Get ComUpdateString Of hoClaims "aud" "https://api.box.com/oauth2/token" To iSuccess

    // Generate 32 random bytes (base64 encoded) for the "jti"
    Get Create (RefClass(cComChilkatPrng)) To hoPrng
    If (Not(IsComObjectCreated(hoPrng))) Begin
        Send CreateComObject of hoPrng
    End
    Get ComGenRandom Of hoPrng 32 "base64" To sTemp1
    Get ComUpdateString Of hoClaims "jti" sTemp1 To iSuccess

    // Set the expiration time to 60 seconds after the current time.
    Get ComGenNumericDate Of hoJwt 60 To iTemp1
    Get ComUpdateInt Of hoClaims "exp" iTemp1 To iSuccess

    // We're going to do the following POST to get a JSON response that contains our OAuth2 access token:

    // 	POST /oauth2/token
    // 	Content-Type: application/x-www-form-urlencoded
    // 	grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&
    // 	assertion=<JWT>&
    // 	client_id=<client_id>&
    // 	client_secret=<client_secret>

    // First, make the initial connection.
    // A single REST object, once connected, can be used for many Box REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End
    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "api.box.com" 443 True iBAutoReconnect To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Add the query params.
    // Calling ClearAllParts is wise if previous requests were sent prior to this one on the same REST object..
    Get ComClearAllParts Of hoRest To iSuccess
    Get ComAddQueryParam Of hoRest "grant_type" "urn:ietf:params:oauth:grant-type:jwt-bearer" To iSuccess
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.clientID" To sTemp1
    Get ComAddQueryParam Of hoRest "client_id" sTemp1 To iSuccess
    Get ComStringOf Of hoJsonRsaKey "boxAppSettings.clientSecret" To sTemp1
    Get ComAddQueryParam Of hoRest "client_secret" sTemp1 To iSuccess
    Get ComCreateJwtPk Of hoJwt (ComEmit(hoJose)) (ComEmit(hoClaims))     Get pvComObject of hoRsaKey to vRsaKey
vRsaKey To sTemp1
    Get ComAddQueryParam Of hoRest "assertion" sTemp1 To iSuccess

    Get ComFullRequestFormUrlEncoded Of hoRest "POST" "/oauth2/token" To sJsonResponse
    Get ComLastMethodSuccess Of hoRest To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // If successful, we'll get a response status code equal to 200,
    // and a JSON response that looks like this:

    // 	{
    // 	   "access_token": "mNr1FrCvOeWiGnwLL0OcTL0Lux5jbyBa",
    // 	   "expires_in": 4169,
    // 	   "restricted_to": [],
    // 	   "token_type": "bearer"
    // 	}
    // 

    Get Create (RefClass(cComChilkatJsonObject)) To hoJResponse
    If (Not(IsComObjectCreated(hoJResponse))) Begin
        Send CreateComObject of hoJResponse
    End
    Set ComEmitCompact Of hoJResponse To False
    Get ComLoad Of hoJResponse sJsonResponse To iSuccess

    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComEmit Of hoJResponse To sTemp1
        Showln sTemp1
        Showln "Failed."
        Procedure_Return
    End

    Get ComEmit Of hoJResponse To sTemp1
    Showln sTemp1

    // Get the access token:
    Get ComStringOf Of hoJResponse "access_token" To sAccessToken
    Showln "Access token, valid for 60 minutes: " sAccessToken


End_Procedure