(C++) Find Contact Having Email Address

Demonstrates how to fetch the Google Contact for a given email address.

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#include <CkJsonObject.h>
#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkStringBuilder.h>
#include <CkXml.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    // 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

    CkJsonObject jsonToken;
    bool success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json");
    if (success != true) {
        std::cout << "Failed to load googleContacts.json" << "\r\n";
        return;
    }

    CkAuthGoogle gAuth;
    gAuth.put_AccessToken(jsonToken.stringOf("access_token"));

    CkRest rest;

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

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

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

    // To retrieve the contacts, we need to send the following:

    // 	GET /m8/feeds/contacts/default/full?q=<emailAddress>
    // 	GData-Version: 3.0

    // Get the contact (or contacts) with this email address:
    const char *emailAddressToFind = "admin@chilkatsoft.com";

    rest.AddHeader("GData-Version","3.0");
    rest.AddQueryParam("q",emailAddressToFind);

    CkStringBuilder sbResponseBody;
    success = rest.FullRequestNoBodySb("GET","/m8/feeds/contacts/default/full",sbResponseBody);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // A successful response will have a status code equal to 200.
    if (rest.get_ResponseStatusCode() != 200) {
        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        std::cout << "response body: " << sbResponseBody.getAsString() << "\r\n";
        return;
    }

    // If the 200 response was received, then the contacts XML is contained
    // in the response body.
    CkXml xml;
    xml.LoadSb(sbResponseBody,false);

    // See below for a sample response body.
    xml.SaveXml("qa_output/google_contacts.xml");

    // 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.
    int totalResults = xml.GetChildIntValue("openSearch:totalResults");
    int startIndex = xml.GetChildIntValue("openSearch:startIndex");
    int itemsPerPage = xml.GetChildIntValue("openSearch:itemsPerPage");
    std::cout << "totalResults = " << totalResults << "\r\n";
    std::cout << "startIndex = " << startIndex << "\r\n";
    std::cout << "itemsPerPage = " << itemsPerPage << "\r\n";

    // We'll borrow a method from FileAccess to get the contactId from the URL string (see the code in the while loop)
    CkFileAccess fac;

    // Iterate over each contact.
    int numEntries = xml.NumChildrenHavingTag("entry");
    int i = 0;
    while (i < numEntries) {
        xml.put_I(i);
        std::cout << (i + 1) << " ----" << "\r\n";
        std::cout << "title: " << xml.getChildContent("entry[i]|title") << "\r\n";

        // The entry "id" child contains a URL having this format:
        // <id>http://www.google.com/m8/feeds/contacts/{userEmail}/base/{contactId}</id>
        // Let's get the URL and parse the contactId from it..
        const char *idUrl = xml.getChildContent("entry[i]|id");
        std::cout << "id: " << idUrl << "\r\n";

        // Use the parsing ability of GetFileName to get the contactId
        const char *contactId = fac.getFileName(idUrl);
        std::cout << "contactId: " << contactId << "\r\n";

        const char *fullName = xml.chilkatPath("entry[i]|gd:name|gd:fullName|*");
        if (xml.get_LastMethodSuccess() == true) {
            std::cout << "fullName: " << fullName << "\r\n";
        }

        const char *emailAddress = xml.chilkatPath("entry[i]|gd:email|(address)");
        if (xml.get_LastMethodSuccess() == true) {
            std::cout << "email address: " << emailAddress << "\r\n";
        }

        i = i + 1;
    }
    }