iOS gamecenter login实现

出自：http://blog.csdn.net/sleepingboy888/article/details/19967625

参考：http://stackoverflow.com/questions/17408729/how-to-authenticate-the-gklocalplayer-on-my-third-party-server

https://gist.github.com/andyzinsser/8044165

工作总结：

任务说明：使用GameCenter账户作为游戏的账户。需要在本地服务器上验证登入信息。

主要参考https://gist.github.com/andyzinsser/8044165网站代码。

1.登入后给自己游戏服务器发post请求确认数据信息

流程：登入GameCenter－通过generateIdentityVerificationSignatureWithCompletionHandler获取相关信息－

 [[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error) {
         if (error) {
             NSLog(@"ERROR: %@",error);
         }
         else
         {
             [[GKLocalPlayer localPlayer] generateIdentityVerificationSignatureWithCompletionHandler:^(NSURL *publicKeyUrl, NSData *signature, NSData *salt, uint64_t timestamp, NSError *error) {
                 if (error) {
                     NSLog(@"ERROR: %@",error);
                 }
                 else{
                     // package data to be sent to server for verification
                     NSDictionary *params = @{@"public_key_url": [publicKeyUrl absoluteString],
                                              @"timestamp": [NSString stringWithFormat:@"%llu", timestamp],
                                              @"signature": [signature base64EncodedStringWithOptions:0],
                                              @"salt": [salt base64EncodedStringWithOptions:0],
                                              @"player_id": [GKLocalPlayer localPlayer].playerID,
                                              @"app_bundle_id": [[NSBundle mainBundle] bundleIdentifier]};
                     NSError *JSONError = nil;
                     NSData *JSONPOSTData = [NSJSONSerialization dataWithJSONObject:params options:NSJSONWritingPrettyPrinted error:&JSONError];
                     NSString *loginURL = /*your game sever*/;
                     NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:loginURL]];
                     [postRequest setHTTPBody:JSONPOSTData];
                     [postRequest setHTTPMethod:@"POST"];
                     NSOperationQueue *queue = [[NSOperationQueue alloc] init];
                     [NSURLConnection sendAsynchronousRequest:postRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                         if (error) {
                             NSLog(@"HttpPostError%@",error);
                         }
                         else
                         {
                             NSInteger responseCode = [(NSHTTPURLResponse*)response statusCode];
                             NSString *responseString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
                             NSLog(@"HttpResponseCode:%d",responseCode);
                             NSLog(@"HttpResponseString:%@",responseString);
                         }
                     }];
                 }

             }];
         }
     }];

2. NSDictionary 转 JSON

 NSDictionary *params = @{@"public_key_url": [publicKeyUrl absoluteString],
                                              @"timestamp": [NSString stringWithFormat:@"%llu", timestamp],
                                              @"signature": [signature base64EncodedStringWithOptions:0],
                                              @"salt": [salt base64EncodedStringWithOptions:0],
                                              @"player_id": [GKLocalPlayer localPlayer].playerID,
                                              @"app_bundle_id": [[NSBundle mainBundle] bundleIdentifier]};
                     NSError *JSONError = nil;
                     NSData *JSONPOSTData = [NSJSONSerialization dataWithJSONObject:params options:NSJSONWritingPrettyPrinted error:&JSONError];

2.JSON 转 NSString

NSString *JSONPOSTString = [[NSString alloc] initWithData:JSONPOSTData encoding:NSUTF8StringEncoding];

3.JSON 转 NSDictionary

NSError *error = nil;

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];