(C) Salesforce OAuth2 Refresh Access Token

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Note: Use Chilkat v10.1.2 or later for this example.

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#include <C_CkJsonObject.h>
#include <C_CkOAuth2.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkOAuth2 oauth2;
    HCkStringBuilder 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 SalesForce OAuth2 Access Token via Authorization Flow

    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/_salesforce.json");
    if (success != TRUE) {
        printf("Failed to load _salesforce.json\n");
        CkJsonObject_Dispose(jsonToken);
        return;
    }

    // This is an example of a Salesforce OAuth2 access token to be refreshed:

    // {
    //   "access_token": "00D41000....uLZBpT6",
    //   "refresh_token": "5Aep....25xdGgkrV",
    //   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
    //   "scope": "refresh_token id",
    //   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
    //   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
    //   "token_type": "Bearer",
    //   "issued_at": "1738348388166"
    // }

    oauth2 = CkOAuth2_Create();

    CkOAuth2_putTokenEndpoint(oauth2,"https://login.salesforce.com/services/oauth2/token");

    // Replace this with your actual client ID (Consumer Key)
    CkOAuth2_putClientId(oauth2,"CLIENT_ID");

    // Note: The client secret is not required because we configured our Connected App
    // to not require it for the refresh flow.  See the screenshot below.

    // Get the "refresh_token"
    CkOAuth2_putRefreshToken(oauth2,CkJsonObject_stringOf(jsonToken,"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = CkOAuth2_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkJsonObject_Dispose(jsonToken);
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // The response contains a new access token, but we must keep
    // our existing refresh token for when we need to refresh again in the future.
    CkJsonObject_UpdateString(jsonToken,"access_token",CkOAuth2_accessToken(oauth2));

    // Save the new JSON access token response to a file.
    sbJson = CkStringBuilder_Create();
    CkJsonObject_putEmitCompact(jsonToken,FALSE);
    CkJsonObject_EmitSb(jsonToken,sbJson);
    CkStringBuilder_WriteFile(sbJson,"qa_data/tokens/_salesforce.json","utf-8",FALSE);

    printf("OAuth2 authorization granted!\n");
    printf("New Access Token = %s\n",CkOAuth2_accessToken(oauth2));

    // --------------------------------------------------------------------------
    // Here's a screenshot of a Salesforce Connected App 
    // which does not requires the secret for the authorization or refresh flow.
    // 


    CkJsonObject_Dispose(jsonToken);
    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);

    }