使用 Apache HttpClient 4 的抢占式基本身份验证

java basic-authentication apache-commons-httpclient

2022-08-31 19:43:59

有没有比这里描述的更简单的方法来设置 http 客户端以进行抢占式基本身份验证？
在以前的版本（3.x）中，它曾经是一个简单的方法调用（例如，）。
我想避免的主要事情是将BasicHttpContext添加到我执行的每个方法中。httpClient.getParams().setAuthenticationPreemptive(true)

答案 1

如果您希望强制 HttpClient 4 使用单个请求进行身份验证，则以下方法将起作用：

String username = ...
String password = ...
UsernamePasswordCredentials creds = new UsernamePasswordCredentials(username, password);

HttpRequest request = ...
request.addHeader(new BasicScheme().authenticate(creds, request));

答案 2

如果不每次都传递上下文，很难做到这一点，但您可以通过使用请求拦截器来做到这一点。以下是我们使用的一些代码（从他们的JIRA，iirc中找到）：

// Pre-emptive authentication to speed things up
BasicHttpContext localContext = new BasicHttpContext();

BasicScheme basicAuth = new BasicScheme();
localContext.setAttribute("preemptive-auth", basicAuth);

httpClient.addRequestInterceptor(new PreemptiveAuthInterceptor(), 0);

(...)

static class PreemptiveAuthInterceptor implements HttpRequestInterceptor {

    public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException {
        AuthState authState = (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE);

        // If no auth scheme avaialble yet, try to initialize it
        // preemptively
        if (authState.getAuthScheme() == null) {
            AuthScheme authScheme = (AuthScheme) context.getAttribute("preemptive-auth");
            CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute(ClientContext.CREDS_PROVIDER);
            HttpHost targetHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
            if (authScheme != null) {
                Credentials creds = credsProvider.getCredentials(new AuthScope(targetHost.getHostName(), targetHost.getPort()));
                if (creds == null) {
                    throw new HttpException("No credentials for preemptive authentication");
                }
                authState.setAuthScheme(authScheme);
                authState.setCredentials(creds);
            }
        }

    }

}