Question

我需要使用基本GET HTTP request调用初始Authentication。这将是第一次将请求发送到服务器并且我已经拥有username & password，因此不需要服务器提出授权进行授权。

第一个问题：

NSURLConnection是否必须设置为同步才能执行基本身份验证？根据{{3}}的答案，如果您选择异步路由，似乎无法执行Basic Auth。
任何人都知道在GET request上展示基本身份验证的任何示例代码，而无需质询响应吗？ post显示了一个示例，但仅在服务器向客户端发出质询请求之后。

我是SDK的新网络部分，我不确定我应该使用哪些其他类来实现这一点。（我看到NSURLCredential类，但似乎在客户端请求服务器授权资源后，它仅用于NSURLAuthenticationChallenge。

Answer 1

我正在使用与MGTwitterEngine的异步连接，并在NSMutableURLRequest（theRequest）中设置授权，如下所示：

NSString *authStr = [NSString stringWithFormat:@"%@:%@", [self username], [self password]];
NSData *authData = [authStr dataUsingEncoding:NSASCIIStringEncoding];
NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64EncodingWithLineLength:80]];
[theRequest setValue:authValue forHTTPHeaderField:@"Authorization"];

我不相信这种方法需要经历挑战循环，但我可能是错的

Answer 2

即使问题得到解答，我想提出一个解决方案，它不需要外部库，我在另一个帖子中找到了：

// Setup NSURLConnection
NSURL *URL = [NSURL URLWithString:url];
NSURLRequest *request = [NSURLRequest requestWithURL:URL
                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                     timeoutInterval:30.0];

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
[connection release];

// NSURLConnection Delegates
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    if ([challenge previousFailureCount] == 0) {
        NSLog(@"received authentication challenge");
        NSURLCredential *newCredential = [NSURLCredential credentialWithUser:@"USER"
                                                                    password:@"PASSWORD"
                                                                 persistence:NSURLCredentialPersistenceForSession];
        NSLog(@"credential created");
        [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge];
        NSLog(@"responded to authentication challenge");    
    }
    else {
        NSLog(@"previous authentication failure");
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    ...
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    ...
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    ...
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    ...
}

Answer 3

以下是没有第三方参与的详细答案：

请点击此处：

//username and password value
NSString *username = @“your_username”;
NSString *password = @“your_password”;

//HTTP Basic Authentication
NSString *authenticationString = [NSString stringWithFormat:@"%@:%@", username, password]];
NSData *authenticationData = [authenticationString dataUsingEncoding:NSASCIIStringEncoding];
NSString *authenticationValue = [authenticationData base64Encoding];

//Set up your request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.your-api.com/“]];

// Set your user login credentials
[request setValue:[NSString stringWithFormat:@"Basic %@", authenticationValue] forHTTPHeaderField:@"Authorization"];

// Send your request asynchronously
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *responseCode, NSData *responseData, NSError *responseError) {
      if ([responseData length] > 0 && responseError == nil){
            //logic here
      }else if ([responseData length] == 0 && responseError == nil){
             NSLog(@"data error: %@", responseError);
             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Error accessing the data" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
             [alert show];
             [alert release];
      }else if (responseError != nil && responseError.code == NSURLErrorTimedOut){
             NSLog(@"data timeout: %@”, NSURLErrorTimedOut);
             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"connection timeout" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
             [alert show];
             [alert release];
      }else if (responseError != nil){
             NSLog(@"data download error: %@”,responseError);
             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"data download error" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
             [alert show];
             [alert release];
      }
}]

请告诉我你对此的反馈。

由于

Answer 4

如果您不想导入整个MGTwitterEngine而您没有进行异步请求然后你可以使用 http://www.chrisumbel.com/article/basic_authentication_iphone_cocoa_touch

以base64编码用户名和密码所以替换

NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64EncodingWithLineLength:80]];

带

NSString *encodedLoginData = [Base64 encode:[loginString dataUsingEncoding:NSUTF8StringEncoding]];

后

您需要包含以下文件

static char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

@implementation Base64
+(NSString *)encode:(NSData *)plainText {
    int encodedLength = (((([plainText length] % 3) + [plainText length]) / 3) * 4) + 1;
    unsigned char *outputBuffer = malloc(encodedLength);
    unsigned char *inputBuffer = (unsigned char *)[plainText bytes];

    NSInteger i;
    NSInteger j = 0;
    int remain;

    for(i = 0; i < [plainText length]; i += 3) {
        remain = [plainText length] - i;

        outputBuffer[j++] = alphabet[(inputBuffer[i] & 0xFC) >> 2];
        outputBuffer[j++] = alphabet[((inputBuffer[i] & 0x03) << 4) | 
                                     ((remain > 1) ? ((inputBuffer[i + 1] & 0xF0) >> 4): 0)];

        if(remain > 1)
            outputBuffer[j++] = alphabet[((inputBuffer[i + 1] & 0x0F) << 2)
                                         | ((remain > 2) ? ((inputBuffer[i + 2] & 0xC0) >> 6) : 0)];
        else 
            outputBuffer[j++] = '=';

        if(remain > 2)
            outputBuffer[j++] = alphabet[inputBuffer[i + 2] & 0x3F];
        else
            outputBuffer[j++] = '=';            
    }

    outputBuffer[j] = 0;

    NSString *result = [NSString stringWithCString:outputBuffer length:strlen(outputBuffer)];
    free(outputBuffer);

    return result;
}
@end

Answer 5

由于不推荐使用NSData :: dataUsingEncoding（ios 7.0），您可以使用此解决方案：

// Forming string with credentials 'myusername:mypassword'
NSString *authStr = [NSString stringWithFormat:@"%@:%@", username, password];
// Getting data from it
NSData *authData = [authStr dataUsingEncoding:NSASCIIStringEncoding];
// Encoding data with base64 and converting back to NSString
NSString* authStrData = [[NSString alloc] initWithData:[authData base64EncodedDataWithOptions:NSDataBase64EncodingEndLineWithLineFeed] encoding:NSASCIIStringEncoding];
// Forming Basic Authorization string Header
NSString *authValue = [NSString stringWithFormat:@"Basic %@", authStrData];
// Assigning it to request
[request setValue:authValue forHTTPHeaderField:@"Authorization"];

Answer 6

如果您使用GTMHTTPFetcher进行连接，基本身份验证也相当简单。您只需在开始提取之前向提取程序提供凭据。

NSString * urlString = @"http://www.testurl.com/";
NSURL * url = [NSURL URLWithString:urlString];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];

NSURLCredential * credential = [NSURLCredential credentialWithUser:@"username" password:@"password" persistence:NSURLCredentialPersistenceForSession];

GTMHTTPFetcher * gFetcher = [GTMHTTPFetcher fetcherWithRequest:request];
gFetcher.credential = credential;

[gFetcher beginFetchWithDelegate:self didFinishSelector:@selector(fetchCompleted:withData:andError:)];

Answer 7

你能告诉我你的示例代码中将编码行长度限制为80的原因是什么？我认为HTTP标头的最大长度类似于4k（或者某些服务器可能不需要更长的时间）。 - Justin Galzic 09年12月29日17:29

它不限于80，它是NSData + Base64.h / m中方法base64EncodingWithLineLength的一个选项，您可以将编码的字符串拆分为多行，这对其他应用程序（如nntp传输）很有用。我相信推特作者选择80是一个足够大的长度，以便将大多数用户/密码编码结果容纳到一行。

Answer 8

您可以使用AFNetworking（它是开源的），这是对我有用的代码。此代码使用基本身份验证发送文件。只需更改网址，电子邮件和密码即可。

NSString *serverUrl = [NSString stringWithFormat:@"http://www.yoursite.com/uploadlink", profile.host];
NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] requestWithMethod:@"POST" URLString:serverUrl parameters:nil error:nil];


NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

// Forming string with credentials 'myusername:mypassword'
NSString *authStr = [NSString stringWithFormat:@"%@:%@", email, emailPassword];
// Getting data from it
NSData *authData = [authStr dataUsingEncoding:NSASCIIStringEncoding];
// Encoding data with base64 and converting back to NSString
NSString* authStrData = [[NSString alloc] initWithData:[authData base64EncodedDataWithOptions:NSDataBase64EncodingEndLineWithLineFeed] encoding:NSASCIIStringEncoding];
// Forming Basic Authorization string Header
NSString *authValue = [NSString stringWithFormat:@"Basic %@", authStrData];
// Assigning it to request
[request setValue:authValue forHTTPHeaderField:@"Authorization"];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

NSURL *filePath = [NSURL fileURLWithPath:[url path]];
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request fromFile:filePath progress:^(NSProgress * _Nonnull uploadProgress) {
// This is not called back on the main queue.
// You are responsible for dispatching to the main queue for UI updates
     dispatch_async(dispatch_get_main_queue(), ^{
                //Update the progress view
                LLog(@"progres increase... %@ , fraction: %f", uploadProgress.debugDescription, uploadProgress.fractionCompleted);
            });
        } completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
            if (error) {
                NSLog(@"Error: %@", error);
            } else {
                NSLog(@"Success: %@ %@", response, responseObject);
            }
        }];
[uploadTask resume];

iOS中的NSURLConnection和基本HTTP身份验证

8 个答案: