(C) Page Through All Contacts

Demonstrates how to page through the entire list of Google Contacts.

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#include <C_CkJsonObject.h>
#include <C_CkAuthGoogle.h>
#include <C_CkRest.h>
#include <C_CkStringBuilder.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkAuthGoogle gAuth;
    HCkRest rest;
    BOOL bAutoReconnect;
    int startIndex;
    int maxResults;
    int totalResults;
    HCkStringBuilder sbMaxResults;
    HCkStringBuilder sbStartIndex;
    int loopIteration;
    HCkStringBuilder sbResponseBody;
    HCkXml xml;
    int startIndex2;
    int itemsPerPage;
    int numEntries;
    int i;
    const char *idUrl;
    const char *fullName;
    const char *emailAddress;
    HCkXml xLink;
    BOOL bHasPhoto;

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

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

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

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

    gAuth = CkAuthGoogle_Create();
    CkAuthGoogle_putAccessToken(gAuth,CkJsonObject_stringOf(jsonToken,"access_token"));

    rest = CkRest_Create();

    // Connect using TLS.
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"www.google.com",443,TRUE,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access token)
    CkRest_SetAuthGoogle(rest,gAuth);

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    startIndex = 1;
    maxResults = 25;
    // The totalResults will get updated with the correct value in the 1st loop iteration..
    totalResults = 100;
    // To retrieve the contacts in pages of 25 each, we need to send the following for each page.

    // 	GET /m8/feeds/contacts/default/full?max-results=25&start-index=<startIndex>
    // 	GData-Version: 3.0

    sbMaxResults = CkStringBuilder_Create();
    CkStringBuilder_AppendInt(sbMaxResults,maxResults);
    sbStartIndex = CkStringBuilder_Create();

    loopIteration = 0;
    while (startIndex <= totalResults) {

        CkStringBuilder_Clear(sbStartIndex);
        CkStringBuilder_AppendInt(sbStartIndex,startIndex);

        CkRest_ClearAllHeaders(rest);
        CkRest_ClearAllQueryParams(rest);
        CkRest_AddHeader(rest,"GData-Version","3.0");
        CkRest_AddQueryParam(rest,"start-index",CkStringBuilder_getAsString(sbStartIndex));
        CkRest_AddQueryParam(rest,"max-results",CkStringBuilder_getAsString(sbMaxResults));

        sbResponseBody = CkStringBuilder_Create();
        success = CkRest_FullRequestNoBodySb(rest,"GET","/m8/feeds/contacts/default/full",sbResponseBody);
        if (success != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
            CkJsonObject_Dispose(jsonToken);
            CkAuthGoogle_Dispose(gAuth);
            CkRest_Dispose(rest);
            CkStringBuilder_Dispose(sbMaxResults);
            CkStringBuilder_Dispose(sbStartIndex);
            CkStringBuilder_Dispose(sbResponseBody);
            return;
        }

        // A successful response will have a status code equal to 200.
        if (CkRest_getResponseStatusCode(rest) != 200) {
            printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
            printf("response status text = %s\n",CkRest_responseStatusText(rest));
            printf("response header: %s\n",CkRest_responseHeader(rest));
            printf("response body: %s\n",CkStringBuilder_getAsString(sbResponseBody));
            CkJsonObject_Dispose(jsonToken);
            CkAuthGoogle_Dispose(gAuth);
            CkRest_Dispose(rest);
            CkStringBuilder_Dispose(sbMaxResults);
            CkStringBuilder_Dispose(sbStartIndex);
            CkStringBuilder_Dispose(sbResponseBody);
            return;
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        xml = CkXml_Create();
        CkXml_LoadSb(xml,sbResponseBody,FALSE);

        // Now let's parse the XML...

        // Get the the total number of results, the start index, and the items per page.
        // We'll likely NOT get the full list, but will instead get the 1st page.
        totalResults = CkXml_GetChildIntValue(xml,"openSearch:totalResults");
        startIndex2 = CkXml_GetChildIntValue(xml,"openSearch:startIndex");
        itemsPerPage = CkXml_GetChildIntValue(xml,"openSearch:itemsPerPage");
        printf("totalResults = %d\n",totalResults);
        printf("startIndex = %d\n",startIndex2);
        printf("itemsPerPage = %d\n",itemsPerPage);

        // Iterate over each contact.
        numEntries = CkXml_NumChildrenHavingTag(xml,"entry");
        i = 0;
        while (i < numEntries) {
            CkXml_putI(xml,i);
            printf("%d ----\n",loopIteration * maxResults + i + 1);
            printf("title: %s\n",CkXml_getChildContent(xml,"entry[i]|title"));

            idUrl = CkXml_getChildContent(xml,"entry[i]|id");
            printf("id: %s\n",idUrl);

            fullName = CkXml_chilkatPath(xml,"entry[i]|gd:name|gd:fullName|*");
            if (CkXml_getLastMethodSuccess(xml) == TRUE) {
                printf("fullName: %s\n",fullName);
            }

            emailAddress = CkXml_chilkatPath(xml,"entry[i]|gd:email|(address)");
            if (CkXml_getLastMethodSuccess(xml) == TRUE) {
                printf("email address: %s\n",emailAddress);
            }

            // Find the photo link and check to see if this contact has a photo.
            xLink = CkXml_GetChildWithAttr(xml,"link","rel","http://schemas.google.com/contacts/2008/rel#photo");
            if (CkXml_getLastMethodSuccess(xml) == TRUE) {
                // Get the photo etag.
                bHasPhoto = CkXml_HasAttribute(xLink,"gd:etag");
                if (bHasPhoto == TRUE) {
                    printf("This contact has a photo.\n");
                }

                CkXml_Dispose(xLink);
            }

            i = i + 1;
        }

        startIndex = startIndex + maxResults;
        loopIteration = loopIteration + 1;
    }



    CkJsonObject_Dispose(jsonToken);
    CkAuthGoogle_Dispose(gAuth);
    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbMaxResults);
    CkStringBuilder_Dispose(sbStartIndex);
    CkStringBuilder_Dispose(sbResponseBody);
    CkXml_Dispose(xml);

    }