(Objective-C) Google Calendar Search Events (List Events with Optional Query Parameters)

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Demonstrates how to specify optional query parameters for listing events. This example uses the "q" parameter to free-text search for events, and uses the "timeMin" parameter to specify a lower bound for an event's end time.

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#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoHttpRequest.h>
#import <CkoDateTime.h>

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

// This example uses a previously obtained access token having permission for the 
// Google Calendar scope.

// In this example, Get Google Calendar OAuth2 Access Token, the access
// token was saved to a JSON file.  This example fetches the access token from the file..
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/googleCalendar.json"];
if ([jsonToken HasMember: @"access_token"] == NO) {
    NSLog(@"%@",@"No access token found.");
    return;
}

CkoHttp *http = [[CkoHttp alloc] init];
http.AuthToken = [jsonToken StringOf: @"access_token"];

// We'll want to build a URL with the query params..
CkoStringBuilder *sbUrl = [[CkoStringBuilder alloc] init];
[sbUrl Append: @"https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?"];

// Use the HTTP request object as a helper for creating the URL encoded query param list..
CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

// Find events with the word "pizza".
[req AddParam: @"q" value: @"pizza"];

// Get events for the current date/time or later.
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
[req AddParam: @"timeMin" value: [dt GetAsTimestamp: NO]];

// Add these query params to the URL:
[sbUrl Append: [req GetUrlEncodedParams]];

// Examine the URL..
NSLog(@"%@%@",@"URL: ",[sbUrl GetAsString]);

// The URL looks like this:
// https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?q=pizza&timeMin=2017-08-11T13%3A35%3A28Z

// Let's get events in the primary calendar.  A calendar ID could have be used instead of "primary".
[http SetUrlVar: @"calendarId" value: @"primary"];
CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: [sbUrl GetAsString] sbContent: sbResponse];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

if ([http.LastStatus intValue] != 200) {
    // Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
    // to be refreshed or re-fetched.
    NSLog(@"%@%d",@"Error response status: ",[http.LastStatus intValue]);
    NSLog(@"%@",[sbResponse GetAsString]);
    return;
}

NSLog(@"%@",[sbResponse GetAsString]);

// A sample JSON response:
// (Code for parsing the Google Calendar events is shown below.)

// {
//  "kind": "calendar#events",
//  "etag": "\"p32cafkumkb7ta0g\"",
//  "summary": "support@chilkatcloud.com",
//  "updated": "2017-08-11T13:19:48.143Z",
//  "timeZone": "America/Chicago",
//  "accessRole": "owner",
//  "defaultReminders": [
//   {
//    "method": "popup",
//    "minutes": 10
//   }
//  ],
//  "nextSyncToken": "CJin09aiz9UCEJin09aiz9UCGAU=",
//  "items": [
//   {
//    "kind": "calendar#event",
//    "etag": "\"3004915160212000\"",
//    "id": "02pv1cpdp7vm11htnfi3ii7iie",
//    "status": "confirmed",
//    "htmlLink": "https://www.google.com/calendar/event?eid=MDJwdjFjcGRwN3ZtMTFodG5maTNpaTdpaWUgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
//    "created": "2017-08-11T13:19:40.000Z",
//    "updated": "2017-08-11T13:19:40.106Z",
//    "summary": "Eat Lou Malnati's Pizza",
//    "creator": {
//     "email": "support@chilkatcloud.com",
//     "self": true
//    },
//    "organizer": {
//     "email": "support@chilkatcloud.com",
//     "self": true
//    },
//    "start": {
//     "dateTime": "2017-08-12T12:00:00-05:00"
//    },
//    "end": {
//     "dateTime": "2017-08-12T13:00:00-05:00"
//    },
//    "iCalUID": "02pv1cpdp7vm11htnfi3ii7iie@google.com",
//    "sequence": 0,
//    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.02pv1cpdp7vm11htnfi3ii7iie",
//    "reminders": {
//     "useDefault": true
//    }
//   }
//  ]
// }
// 
// 

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadSb: sbResponse];

int numEvents = [[json SizeOfArray: @"items"] intValue];
int i = 0;
while (i < numEvents) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@",[json StringOf: @"items[i].summary"]);
    NSLog(@"%@",[json StringOf: @"items[i].start.dateTime"]);
    NSLog(@"%@",[json StringOf: @"items[i].end.dateTime"]);
    NSLog(@"%@",@"--");
    i = i + 1;
}

// Sample output:

// Eat Lou Malnati's Pizza
// 2017-08-12T12:00:00-05:00
// 2017-08-12T13:00:00-05:00
// --