(Unicode C) Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

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

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#include <C_CkJsonObjectW.h>
#include <C_CkOAuth2W.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW jsonToken;
    BOOL success;
    HCkOAuth2W oauth2;
    HCkStringBuilderW sbJson;

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

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Docusign OAuth2 Access Token

    jsonToken = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/docusign.json");
    if (success != TRUE) {
        wprintf(L"Failed to load docusign.json\n");
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    // The access token JSON looks like this:

    // {
    //   "access_token": "eyJ0eXA....YQyig",
    //   "token_type": "Bearer",
    //   "refresh_token": "eyJ0eXA....auE3eHKg",
    //   "expires_in": 28800
    // }

    oauth2 = CkOAuth2W_Create();

    // For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
    // For the production platform, the token endpoint is https://account.docusign.com/oauth/token
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://account-d.docusign.com/oauth/token");

    // Replace these with actual values.
    // The client ID is also known as the "integration key" in Docusign.
    CkOAuth2W_putClientId(oauth2,L"MY_DOCUSIGN_CLIENT_ID");
    // This is your secret key for the authorization code grant.
    CkOAuth2W_putClientSecret(oauth2,L"MY_DOCUSIGN_CLIENT_SECRET");

    // Get the "refresh_token"
    CkOAuth2W_putRefreshToken(oauth2,CkJsonObjectW_stringOf(jsonToken,L"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = CkOAuth2W_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkJsonObjectW_Dispose(jsonToken);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    wprintf(L"New access token: %s\n",CkOAuth2W_accessToken(oauth2));
    wprintf(L"New refresh token: %s\n",CkOAuth2W_refreshToken(oauth2));

    // Update the JSON with the new tokens.
    CkJsonObjectW_UpdateString(jsonToken,L"access_token",CkOAuth2W_accessToken(oauth2));
    CkJsonObjectW_UpdateString(jsonToken,L"refresh_token",CkOAuth2W_refreshToken(oauth2));

    // Save the new JSON access token response to a file.
    sbJson = CkStringBuilderW_Create();
    CkJsonObjectW_putEmitCompact(jsonToken,FALSE);
    CkJsonObjectW_EmitSb(jsonToken,sbJson);
    CkStringBuilderW_WriteFile(sbJson,L"qa_data/tokens/docusign.json",L"utf-8",FALSE);

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"New Access Token = %s\n",CkOAuth2W_accessToken(oauth2));


    CkJsonObjectW_Dispose(jsonToken);
    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);

    }