(C) QuickBooks - Automatically Refresh Access Token with No User Interaction

Demonstrates how to automaticaly refresh an expired access token and retry the request after a 401 authorization error.

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#include <C_CkJsonObject.h>
#include <C_CkRest.h>
#include <C_CkStringBuilder.h>
#include <C_CkOAuth2.h>
#include <C_CkDateTime.h>
#include <C_CkDtObj.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkRest rest;
    BOOL bAutoReconnect;
    HCkStringBuilder sbAuth;
    const char *responseBody;
    HCkOAuth2 oauth2;
    HCkStringBuilder sbJson;
    HCkJsonObject json;
    HCkDateTime dtime;
    BOOL bLocalTime;
    HCkDtObj dt;

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

    // Get our previously obtained OAuth2 access token, which should contain JSON like this:
    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/qb-access-token.json");

    rest = CkRest_Create();

    // Connect using TLS.
    // A single REST object, once connected, can be used for many Quickbooks 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.
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"sandbox-quickbooks.api.intuit.com",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        return;
    }

    sbAuth = CkStringBuilder_Create();
    CkStringBuilder_Append(sbAuth,"Bearer ");
    CkStringBuilder_Append(sbAuth,CkJsonObject_stringOf(jsonToken,"access_token"));
    CkRest_putAuthorization(rest,CkStringBuilder_getAsString(sbAuth));

    CkRest_AddHeader(rest,"Accept","application/json");
    CkRest_putAllowHeaderFolding(rest,FALSE);

    // The company ID is 123146096291789
    // The employee ID is 58
    responseBody = CkRest_fullRequestNoBody(rest,"GET","/v3/company/123146096291789/employee/58?minorversion=45");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbAuth);
        return;
    }

    // If we get a 401 authorization error, then it's likely because the access token expired.
    // We can automatically refresh it without interaction from the user.
    if (CkRest_getResponseStatusCode(rest) == 401) {

        oauth2 = CkOAuth2_Create();

        CkOAuth2_putTokenEndpoint(oauth2,"https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer");

        // Replace these with actual values.
        CkOAuth2_putClientId(oauth2,"QUICKBOOKS-CLIENT-ID");
        CkOAuth2_putClientSecret(oauth2,"QUICKBOOKS-CLIENT-SECRET");

        // 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);
            CkRest_Dispose(rest);
            CkStringBuilder_Dispose(sbAuth);
            CkOAuth2_Dispose(oauth2);
            return;
        }

        printf("New access token: %s\n",CkOAuth2_accessToken(oauth2));

        // Update the JSON with the new tokens.
        CkJsonObject_UpdateString(jsonToken,"access_token",CkOAuth2_accessToken(oauth2));

        // Save the new JSON access token response to a file.
        // The access + refresh tokens contained in this JSON will be needed for the next refresh.
        sbJson = CkStringBuilder_Create();
        CkJsonObject_putEmitCompact(jsonToken,FALSE);
        CkJsonObject_EmitSb(jsonToken,sbJson);
        CkStringBuilder_WriteFile(sbJson,"qa_data/tokens/qb-access-token.json","utf-8",FALSE);

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

        CkStringBuilder_Clear(sbAuth);
        CkStringBuilder_Append(sbAuth,"Bearer ");
        CkStringBuilder_Append(sbAuth,CkOAuth2_accessToken(oauth2));
        CkRest_putAuthorization(rest,CkStringBuilder_getAsString(sbAuth));

        // Now retry the request with the refreshed access token...
        responseBody = CkRest_fullRequestNoBody(rest,"GET","/v3/company/123146096291789/employee/58?minorversion=45");
        if (CkRest_getLastMethodSuccess(rest) != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
            CkJsonObject_Dispose(jsonToken);
            CkRest_Dispose(rest);
            CkStringBuilder_Dispose(sbAuth);
            CkOAuth2_Dispose(oauth2);
            CkStringBuilder_Dispose(sbJson);
            return;
        }

    }

    // We should expect a 200 response if successful.
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("Request Header: \n");
        printf("%s\n",CkRest_lastRequestHeader(rest));
        printf("----\n");
        printf("Response StatusCode = %d\n",CkRest_getResponseStatusCode(rest));
        printf("Response StatusLine: %s\n",CkRest_responseStatusText(rest));
        printf("Response Header:\n");
        printf("%s\n",CkRest_responseHeader(rest));
        printf("%s\n",responseBody);
        CkJsonObject_Dispose(jsonToken);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbAuth);
        CkOAuth2_Dispose(oauth2);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    // Load the JSON response into a JSON object for parsing.
    // A sample JSON response is shown below.
    json = CkJsonObject_Create();
    CkJsonObject_Load(json,responseBody);

    // These will be used for parsing date/time strings..
    dtime = CkDateTime_Create();
    bLocalTime = TRUE;

    // Show the JSON.   
    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));

    // Get some information from the JSON..
    printf("Name: %s\n",CkJsonObject_stringOf(json,"Employee.DisplayName"));
    printf("Id: %s\n",CkJsonObject_stringOf(json,"Employee.Id"));
    printf("City: %s\n",CkJsonObject_stringOf(json,"Employee.PrimaryAddr.City"));
    printf("PostalCode: %s\n",CkJsonObject_stringOf(json,"Employee.PrimaryAddr.PostalCode"));

    // Load the CreateTime into a CkDateTime...
    CkDateTime_SetFromTimestamp(dtime,CkJsonObject_stringOf(json,"Employee.MetaData.CreateTime"));
    dt = CkDateTime_GetDtObj(dtime,bLocalTime);
    printf("%d/%d/%d  %d:%d\n",CkDtObj_getMonth(dt),CkDtObj_getDay(dt),CkDtObj_getYear(dt),CkDtObj_getHour(dt),CkDtObj_getMinute(dt));
    CkDtObj_Dispose(dt);

    printf("Success.\n");

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // ------------------------------------------------------
    // The JSON response looks like this:

    // {
    //   "Employee": {
    //     "SSN": "XXX-XX-XXXX",
    //     "PrimaryAddr": {
    //       "Id": "116",
    //       "Line1": "45 N. Elm Street",
    //       "City": "Middlefield",
    //       "CountrySubDivisionCode": "CA",
    //       "PostalCode": "93242"
    //     },
    //     "BillableTime": false,
    //     "domain": "QBO",
    //     "sparse": false,
    //     "Id": "98",
    //     "SyncToken": "0",
    //     "MetaData": {
    //       "CreateTime": "2015-07-24T09:34:35-07:00",
    //       "LastUpdatedTime": "2015-07-24T09:34:35-07:00"
    //     },
    //     "GivenName": "Bill",
    //     "FamilyName": "Miller",
    //     "DisplayName": "Bill Miller",
    //     "PrintOnCheckName": "Bill Miller",
    //     "Active": true,
    //     "PrimaryPhone": {
    //       "FreeFormNumber": "234-525-1234"
    //     }
    //   },
    //   "time": "2015-07-24T09:35:54.805-07:00"
    // 


    CkJsonObject_Dispose(jsonToken);
    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbAuth);
    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);
    CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dtime);

    }