Objective-C

Google Contacts - Delete a Contact

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Demonstrates how to delete a Google Contact. Objective-C

#import <CkoJsonObject.h>
#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoStringBuilder.h>
#import <CkoXml.h>
#import <NSString.h>

BOOL success = NO;

// 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

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
success = [jsonToken LoadFile: @"qa_data/tokens/googleContacts.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load googleContacts.json");
    return;
}

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];
gAuth.AccessToken = [jsonToken StringOf: @"access_token"];

CkoRest *rest = [[CkoRest alloc] init];

// Connect using TLS.
BOOL bAutoReconnect = YES;
success = [rest Connect: @"www.google.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];

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

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

// To update a contact, we'll first get the contact information
// to get the etag.

// To retrieve the contact, send the following:
// 	GET /m8/feeds/contacts/default/full/{contactId}
// 	GData-Version: 3.0

[rest AddHeader: @"GData-Version" value: @"3.0"];

CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/m8/feeds/contacts/default/full/{contactId}"];
// Get the contact having contactId = "5b6d64980b1ed462"
int numReplacements = [[sbPath Replace: @"{contactId}" replacement: @"5b6d64980b1ed462"] intValue];

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [rest FullRequestNoBodySb: @"GET" uriPath: [sbPath GetAsString] sb: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A successful response will have a status code equal to 200.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response body: ",[sbResponseBody GetAsString]);
    return;
}

// If the 200 response was received, then the contacts XML is contained
// in the response body.
CkoXml *xml = [[CkoXml alloc] init];
[xml LoadSb: sbResponseBody autoTrim: NO];

NSLog(@"%@",[xml GetXml]);
NSLog(@"%@",@"-------------------");

// Get the etag:
NSString *lastKnownEtag = [xml GetAttrValue: @"gd:etag"];
NSLog(@"%@%@",@"lastKnownEtag = ",lastKnownEtag);
NSLog(@"%@",@"-------------------");

// To delete, send the following:

// 	DELETE /m8/feeds/contacts/default/full/{contactId}
// 	If-Match: {lastKnownEtag}
// 	GData-Version: 3.0

[rest ClearAllHeaders];
[rest AddHeader: @"If-Match" value: lastKnownEtag];
[rest AddHeader: @"GData-Version" value: @"3.0"];

// The sbPath already contains the correct path..
success = [rest FullRequestNoBodySb: @"DELETE" uriPath: [sbPath GetAsString] sb: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A successful response will have a status code equal to 200.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response body: ",[sbResponseBody GetAsString]);
    NSLog(@"%@%@",@"request header: ",rest.LastRequestHeader);
    return;
}

// The response body for a successful DELETE is empty.
NSLog(@"%@",@"Response Body: (should be empty)");
NSLog(@"%@",[sbResponseBody GetAsString]);
NSLog(@"%@",@"Success.");