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.");