記錄一下在網絡請求中證書驗證的基于NSURLConnection的實現

一.開始一個請求

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //保存數據
    self.data = [NSMutableData data];
    
    NSMutableURLRequest * request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://XXXXXXXXXXXX"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:240];
    [request setHTTPMethod:@"POST"];
    [request setHTTPShouldHandleCookies:YES];
    NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSData *postData = [@"XX=XX&XX=XX" dataUsingEncoding:gbkEncoding];
    [request setHTTPBody:postData];

    self.connection = [NSURLConnection connectionWithRequest:request delegate:self];
}

二.實現NSURLConnection驗證的回調方法

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    
    if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
        SecTrustRef trust = challenge.protectionSpace.serverTrust;
        SecTrustResultType result;
        
        //獲取本地證書
        NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"XXX" ofType:@"cer"]];
        SecCertificateRef certificate = SecCertificateCreateWithData(NULL, (__bridge CFDataRef)(data));
        
        SecTrustSetAnchorCertificates(trust, (__bridge CFArrayRef)@[CFBridgingRelease(certificate)]);
        OSStatus status = SecTrustEvaluate(trust, &result);
        
        
        if (status == errSecSuccess &&
            (result == kSecTrustResultProceed ||
             result == kSecTrustResultUnspecified)) {
                
                //驗證成功，生成NSURLCredential憑證cred，告知challenge的sender使用這個憑證來繼續連接
                NSURLCredential *cred = [NSURLCredential credentialForTrust:trust];
                [challenge.sender useCredential:cred forAuthenticationChallenge:challenge];
                
            } else {
                
                //驗證失敗，取消這次驗證流程
                [challenge.sender cancelAuthenticationChallenge:challenge];
                
            }
    }
}

三.接收數據

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.data appendData:data];
}

四.處理數據

- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSString *retStr = [[NSString alloc] initWithData:self.data encoding:enc];
    NSLog(@"retString:%@",retStr);
    NSData* newData=[retStr dataUsingEncoding:NSUTF8StringEncoding];
    NSError *error = nil;
    id responseObject = [NSJSONSerialization JSONObjectWithData:newData options:NSJSONReadingMutableLeaves error:&error];
    if (error) {
        NSLog(@"error:%@",error);
    }
    if (responseObject) {
        NSLog(@"%@", responseObject);
    }else{
        
    }
}