Android OkHttp与基本认证

Question

我正在为一个新项目使用OkHttp库，它的易用性给我留下了深刻的印象。我现在需要使用基本身份验证。不幸的是，缺少可用的示例代码。我正在寻找一个示例，说明在遇到HTTP 401头时如何将用户名/密码凭据传递给OkAuthenticator。我看到了这个答案：

改装带有基本HTTP身份验证的POST请求：“无法重试流式HTTP正文”

但这并没有让我走得太远。OkHttp github repo上的示例也没有基于身份验证的示例。有没有人有一个要点或其他代码示例可以让我指出正确的方向？谢谢你的帮助！

Answer 1

以下是更新的代码：

client.setAuthenticator(new Authenticator() {
  @Override
  public Request authenticate(Proxy proxy, Response response) throws IOException {
    String credential = Credentials.basic("scott", "tiger");
    return response.request().newBuilder().header("Authorization", credential).build();
  }

  @Override
  public Request authenticateProxy(Proxy proxy, Response response) throws IOException {
    return null;
  }
})

Answer 2

正如@agamov所指出的：

上述解决方案有一个缺点：http客户端仅在收到401响应后才添加授权头

@阿加莫夫随后建议“手动”为每个请求添加身份验证头，但有一个更好的解决方案：使用拦截器：

import java.io.IOException;
import okhttp3.Credentials;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

public class BasicAuthInterceptor implements Interceptor {

    private String credentials;

    public BasicAuthInterceptor(String user, String password) {
        this.credentials = Credentials.basic(user, password);
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        Request authenticatedRequest = request.newBuilder()
                    .header("Authorization", credentials).build();
        return chain.proceed(authenticatedRequest);
    }

}

然后，只需将拦截器添加到OkHttp客户端，您将使用该客户端发出所有经过身份验证的请求：

OkHttpClient client = new OkHttpClient.Builder()
    .addInterceptor(new BasicAuthInterceptor(username, password))
    .build();

Answer 3

import okhttp3.Authenticator;
import okhttp3.Credentials;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.Route;

public class NetworkUtil {

private final OkHttpClient.Builder client;

{
    client = new OkHttpClient.Builder();
    client.authenticator(new Authenticator() {
        @Override
        public Request authenticate(Route route, Response response) throws IOException {
            if (responseCount(response) >= 3) {
                return null; // If we've failed 3 times, give up. - in real life, never give up!!
            }
            String credential = Credentials.basic("name", "password");
            return response.request().newBuilder().header("Authorization", credential).build();
        }
    });
    client.connectTimeout(10, TimeUnit.SECONDS);
    client.writeTimeout(10, TimeUnit.SECONDS);
    client.readTimeout(30, TimeUnit.SECONDS);
}

private int responseCount(Response response) {
    int result = 1;
    while ((response = response.priorResponse()) != null) {
        result++;
    }
    return result;
}

}