如何連接到需要用戶名和密碼的網站

Question

我有一個基本問題，我希望有一個簡單的答案，我錯過了。基本前提是我要連接到一個網站並下載一些JSON數據。我正在使用Stig Brautaset提供的框架，該教程工作得很好。

我的問題是，我連接到的網站是格式和用戶名和密碼是固定的我的應用程序，所以用戶將永遠不會輸入它們。

curl -u username:password http://website.com/page 

如何將網址和密碼傳遞到NSURLConnection？

它不一定是NSURLConnection，它似乎是最好的選擇。

我已經看過AdvancedUrlConnections樣本，但它看起來過於複雜並且相當陳舊。在網上搜索並沒有好多少。我希望你們中的一個人可以說只是設置這2個屬性，然後是適當的侮辱當然...

Answer 1

的NSURLConnection的該-asBase64EncodedString方法會工作得很好。正如在另一個答案中指出的那樣，執行回調函數很容易。

- (void) someMethod 
{ 
    NSURLRequest* request = [[NSURLRequest alloc] 
     initWithURL:[NSURL urlWithString:@"someURL"] 

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

    [connection release]; 
    [request release]; 
} 

這是非常簡單的。它在NSURLConnection的所有魔術發生的代表方法中：

這是處理憑證挑戰的地方。我已經硬編碼了一個假的用戶名和密碼來演示它的工作原理。我個人有一個單獨的委託對象處理挑戰。請記住，連接將處於空閒狀態，直到您響應或連接超時。

- (void) connection:(NSURLConnection *)connection 
     didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge 
{ 
    // Make sure to use the appropriate authentication method for the server to 
    // which you are connecting. 
    if ([[challenge protectionSpace] authenticationMethod] == 
      NSURLAuthenticationMethodBasicAuth) 
    { 
      // This is very, very important to check. Depending on how your 
      // security policies are setup, you could lock your user out of his 
      // or her account by trying to use the wrong credentials too many 
      // times in a row. 
     if ([challenge previousFailureCount] > 0) 
     { 
      [[challenge sender] cancelAuthenticationChallenge:challenge]; 

      UIAlertView* alert = [[UIAlertView alloc] 
          initWithTitle:@"Invalid Credentials" 
            message:@"The credentials are invalid." 
           delegate:nil 
         cancelButtonTitle:@"OK" 
         otherButtonTitles:nil]; 
      [alert show]; 
      [alert release];  
     } 
     else 
     { 
      [challenge useCredential:[NSURLCredential 
        credentialWithUser:@"someUser" 
          password:@"somePassword" 
          persistence:NSURLCredentialPersistenceForSession 
      forAuthenticationChallenge:challenge]]; 
     } 
    } 
    else 
    { 
     // Do whatever you want here, for educational purposes, 
      // I'm just going to cancel the challenge 
     [[challenge sender] cancelAuthenticationChallenge:challenge]; 
    } 
} 

你需要實現一個NSURLConnection的這些方法，以及：

// So you know when it's done downloading 
- (void) connectionDidFinishLoading:(NSURLConnection *)connection; 
// In case of failure 
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;  
// Gather the downloaded file data 
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; 

Answer 2

有幾種可能性。

如果使用異步NSURLConnection，則將在連接的委託上調用方法-connection:didReceiveAuthenticationChallenge:。該方法的文檔解釋瞭如何處理它。這是AdvancedUrlConnections的用途，是的，這有點混亂。

更簡單的方法是在創建連接時創建NSMutableURLRequest（而不是不可變的NSURLRequest）。這使您可以添加任意的HTTP標頭。構建基本的認證報頭是simple--像

NSMutableURLRequest *request = .... // details omitted 
NSString *username = // .... 
NSString *password = // .... 
NSData *authRawData = [[NSString stringWithFormat:@"%@:%@", username, password] dataUsingEncoding:NSUTF8StringEncoding]; 
NSString *authEncoded = [authRawData asBase64EncodedString]; 
[request setValue:[NSString stringWithFormat:@"Basic %@", authEncoded] forHTTPHeaderField:@"Authorization"]; 

以上使用包含在TouchFoundation