ios - 通过 JSON API Objective-C 发送 POST 请求

Question

我正在使用 oAuth2，我正在尝试找出将登录凭据发布到 API 并接收 secret、secret_id 和 token 作为返回的最佳方式。

API 的 log_in 部分的 JSON 格式如下:

POST auth/log_in HTTP/1.1
Host: hostSite.com
Content-Type: application/JSON
Authorization: Basic Base64(client_id:client_secret)
{
    "username": "email@example.com"
    "password": "Purpl3H0rs3Oc3an"
    "grant_type": "password"
    "request_refresh": "true"
}

我要发送的登录凭据是:

 - (BOOL) loginUser
{
NSString *  sUserName = [m_jsonDict valueForKey:@"username"],
         *  sPassword = [m_jsonDict valueForKey:@"password"],
         *  sJSON = [NSString   stringWithFormat:@"userName: %@\npassword: %@\n",
                                              sUserName, sPassword];

return ([self POSTUsingCommand:@"login" andData:sJSON]);
}

然后实际发送请求:

     (BOOL) POSTUsingCommand : (NSString *) sCommand
         andData                : (NSString *) sData
{
    BOOL                    ret = NO;
    NSString            *   url = [NSString stringWithFormat:CONST_PATH, NSLocalizedString(sCommand, nil)]; 
    //hostSite.com/auth/log_in

    NSString            *   sHTTPBody = sData;
    NSMutableURLRequest *   request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                          timeoutInterval:15.0];

#if defined(DEBUG)
    NSLog(@"--- POSTUsingCommand:\n%@\n", sHTTPBody);
#endif

    // build out the post command

    [request setHTTPMethod:@"POST"];
    [request setValue:@"Application/json" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"Application/json" forHTTPHeaderField:@"Accept"];
    [request setHTTPBody:[sHTTPBody dataUsingEncoding:NSUTF8StringEncoding]];

    if ([NSURLConnection connectionWithRequest:request
                                      delegate:self] == nil)
    {
#if defined(DEBUG)
        NSLog(@"There was a problem with initWithRequest:delegate\n");
#endif
    }
    else
    {
        ret = YES;
    }

    return (ret);
}

现在，在测试我的代码时，我检查了 connection:DidReceiveResponse 方法中的 response 变量。请求的状态为 400。为什么我会收到此错误是否需要完成其他设置？

Answer 1

您的sHTTPBody不是json格式。要将其获取为 json，您可以创建数据字典。然后使用json序列化将其转换为json。

根据您的数据准备字典:

NSMutableDictionary *dataDict = [NSMutableDictionary new];
[dataDict setObject:sUserName forKey:@"username"];
[dataDict setObject:sPassword forKey:@"password"];
// And so on ...

将字典转换为Json数据:

NSError *error;
NSData *postData = [NSJSONSerialization dataWithJSONObject:dataDict 
                                                   options:0
                                                     error:&error];

最后发送带有json数据的post请求:

[request setHTTPBody:postData];

这应该有效。请注意此代码中的语法和小错误。我还没有测试过。您可能需要稍微调整您的方法才能使用此代码。