(SQL Server) Docusign JSON Web Token (JWT) Grant

Demonstrates how to obtain an access token using the JSON Web Token (JWT) Grant. This is good for service integrations where authorization and authentication is automated and cannot have interactive Docusign account owner interaction. Consent for the access is obtained beforehand in various ways. See Obtaining Consent.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-jsonwebtoken

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

// Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
//
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @sTmp1 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- 1. Assume we have already requested and obtained application consent.
    --    (See Request Docusign Application Consent
    -- 
    -- 2. Create a JWT Token.
    -- 
    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.PrivateKey', @privKey OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Load an RSA private key from a PEM file.
    DECLARE @success int
    EXEC sp_OAMethod @privKey, 'LoadPemFile', @success OUT, 'qa_data/pem/docusign_private_rsa_key.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    DECLARE @jwt int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Jwt', @jwt OUT

    -- Build the JOSE header
    DECLARE @jose int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.JsonObject', @jose OUT

    -- Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    EXEC sp_OAMethod @jose, 'AppendString', @success OUT, 'alg', 'RS256'
    EXEC sp_OAMethod @jose, 'AppendString', @success OUT, 'typ', 'JWT'

    -- Now build the JWT claims (also known as the payload)
    DECLARE @claims int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.JsonObject', @claims OUT

    -- Replace these with actual values.
    -- The client ID is also known as the "integration key" in Docusign.
    EXEC sp_OAMethod @claims, 'AppendString', @success OUT, 'iss', 'MY_DOCUSIGN_CLIENT_ID'
    -- In your DocuSign Admin/Account/UserProfile, this is the API Username, such as 14612117-2530-4982-8c49-ba8766303272
    EXEC sp_OAMethod @claims, 'AppendString', @success OUT, 'sub', 'DOCUSIGN_USER_ID'
    EXEC sp_OAMethod @claims, 'AppendString', @success OUT, 'aud', 'account-d.docusign.com'
    EXEC sp_OAMethod @claims, 'AppendString', @success OUT, 'scope', 'signature'

    -- Set the timestamp of when the JWT was created to now.
    DECLARE @curDateTime int
    EXEC sp_OAMethod @jwt, 'GenNumericDate', @curDateTime OUT, 0
    EXEC sp_OAMethod @claims, 'AddIntAt', @success OUT, -1, 'iat', @curDateTime

    -- Set the "not process before" timestamp to now.
    EXEC sp_OAMethod @claims, 'AddIntAt', @success OUT, -1, 'nbf', @curDateTime

    -- Set the timestamp defining an expiration time (end time) for the token
    -- to be now + 1 hour (3600 seconds)
    EXEC sp_OAMethod @claims, 'AddIntAt', @success OUT, -1, 'exp', @curDateTime + 3600

    -- Produce the smallest possible JWT:
    EXEC sp_OASetProperty @jwt, 'AutoCompact', 1

    -- Create the JWT token.  This is where the RSA signature is created.
    DECLARE @token nvarchar(4000)
    EXEC sp_OAMethod @jose, 'Emit', @sTmp0 OUT
    EXEC sp_OAMethod @claims, 'Emit', @sTmp1 OUT
    EXEC sp_OAMethod @jwt, 'CreateJwtPk', @token OUT, @sTmp0, @sTmp1, @privKey


    PRINT @token

    -- Do the following CURL statement to get the response JSON which contains the access token.
    -- curl --data "grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&assertion=YOUR_JSON_WEB_TOKEN" 
    --      --request POST https://account-d.docusign.com/oauth/token
    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Http', @http OUT

    DECLARE @req int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.HttpRequest', @req OUT

    EXEC sp_OAMethod @req, 'AddParam', NULL, 'grant_type', 'urn:ietf:params:oauth:grant-type:jwt-bearer'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'assertion', @token

    DECLARE @resp int
    EXEC sp_OAMethod @http, 'PostUrlEncoded', @resp OUT, 'https://account-d.docusign.com/oauth/token', @req
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @jwt
        EXEC @hr = sp_OADestroy @jose
        EXEC @hr = sp_OADestroy @claims
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @req
        RETURN
      END


    EXEC sp_OAGetProperty @resp, 'StatusCode', @iTmp0 OUT
    PRINT 'response status = ' + @iTmp0
    EXEC sp_OAGetProperty @resp, 'StatusCode', @iTmp0 OUT
    IF @iTmp0 <> 200
      BEGIN
        EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Failed.'
      END
    ELSE
      BEGIN
        -- Save the access token to a file for use in subsequent requests..
        -- (Or you may simply persiste the access token in memory for your applicaton to use for subsequent REST API calls..)
        EXEC sp_OAMethod @resp, 'SaveBodyText', @success OUT, 1, 'qa_data/tokens/docusign.json'
        EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Success.'
      END

    EXEC @hr = sp_OADestroy @resp


    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @jwt
    EXEC @hr = sp_OADestroy @jose
    EXEC @hr = sp_OADestroy @claims
    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @req


END
GO