Zig

Page Through All Contacts

See more Google APIs Examples

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

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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

    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    json_token.loadFile("qa_data/tokens/googleContacts.json") catch {
        std.debug.print("Failed to load googleContacts.json\n", .{});
        return;
    };

    const g_auth = try chilkat.AuthGoogle.init();
    defer g_auth.deinit();
    g_auth.setAccessToken(try json_token.stringOf(alloc, "access_token"));

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    // Connect using TLS.
    const b_auto_reconnect = true;
    try rest.connect("www.google.com", 443, true, b_auto_reconnect);

    // Provide the authentication credentials (i.e. the access token)
    rest.setAuthGoogle(g_auth) catch {};

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

    var start_index: i32 = 1;
    const max_results = 25;
    // The totalResults will get updated with the correct value in the 1st loop iteration..
    var total_results: i32 = 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

    const sb_max_results = try chilkat.StringBuilder.init();
    defer sb_max_results.deinit();
    sb_max_results.appendInt(max_results) catch {};
    const sb_start_index = try chilkat.StringBuilder.init();
    defer sb_start_index.deinit();

    var loop_iteration: i32 = 0;
    while (start_index <= total_results) {
        sb_start_index.clear();
        sb_start_index.appendInt(start_index) catch {};

        rest.clearAllHeaders() catch {};
        rest.clearAllQueryParams() catch {};
        rest.addHeader("GData-Version", "3.0") catch {};
        rest.addQueryParam("start-index", try sb_start_index.getAsString(alloc)) catch {};
        rest.addQueryParam("max-results", try sb_max_results.getAsString(alloc)) catch {};

        const sb_response_body = try chilkat.StringBuilder.init();
        defer sb_response_body.deinit();
        rest.fullRequestNoBodySb("GET", "/m8/feeds/contacts/default/full", sb_response_body) catch {
            std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
            return;
        };

        // A successful response will have a status code equal to 200.
        if (rest.getResponseStatusCode() != 200) {
            std.debug.print("response status code = {d}\n", .{rest.getResponseStatusCode()});
            std.debug.print("response status text = {s}\n", .{try rest.getResponseStatusText(alloc)});
            std.debug.print("response header: {s}\n", .{try rest.getResponseHeader(alloc)});
            std.debug.print("response body: {s}\n", .{try sb_response_body.getAsString(alloc)});
            return;
        }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        const xml = try chilkat.Xml.init();
        defer xml.deinit();
        xml.loadSb(sb_response_body, false) catch {};

        // 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.
        total_results = xml.getChildIntValue("openSearch:totalResults");
        const start_index2 = xml.getChildIntValue("openSearch:startIndex");
        const items_per_page = xml.getChildIntValue("openSearch:itemsPerPage");
        std.debug.print("totalResults = {d}\n", .{total_results});
        std.debug.print("startIndex = {d}\n", .{start_index2});
        std.debug.print("itemsPerPage = {d}\n", .{items_per_page});

        // Iterate over each contact.
        const num_entries = xml.numChildrenHavingTag("entry");
        var i: i32 = 0;
        while (i < num_entries) {
            xml.setI(i);
            std.debug.print("{d} ----\n", .{loop_iteration * max_results + i + 1});
            std.debug.print("title: {s}\n", .{try xml.getChildContent(alloc, "entry[i]|title")});

            const id_url = try xml.getChildContent(alloc, "entry[i]|id");
            std.debug.print("id: {s}\n", .{id_url});

            if (xml.chilkatPath(alloc, "entry[i]|gd:name|gd:fullName|*")) |full_name| {
                std.debug.print("fullName: {s}\n", .{full_name});
            } else |_| {}

            if (xml.chilkatPath(alloc, "entry[i]|gd:email|(address)")) |email_address| {
                std.debug.print("email address: {s}\n", .{email_address});
            } else |_| {}

            // Find the photo link and check to see if this contact has a photo.
            if (xml.getChildWithAttr("link", "rel", "http://schemas.google.com/contacts/2008/rel#photo")) |x_link| {
                defer x_link.deinit();
                // Get the photo etag.
                const b_has_photo = x_link.hasAttribute("gd:etag");
                if (b_has_photo) {
                    std.debug.print("This contact has a photo.\n", .{});
                }
            } else |_| {}

            i = i + 1;
        }

        start_index = start_index + max_results;
        loop_iteration = loop_iteration + 1;
    }
}