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The Files.com Java client library provides convenient access to the Files.com API from JVM based applications.

There is a newer version: 1.4.123

package com.files.net;


import com.files.FilesConfig;
import com.files.exceptions.ApiErrorException;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.io.IOException;

public class FilesHttpInterceptor implements Interceptor {
  protected static final Logger log = LogManager.getLogger(FilesHttpInterceptor.class);
  private final String userAgent;
  private FilesConfig filesConfig = FilesConfig.getInstance();

  public FilesHttpInterceptor() {
    this.userAgent = filesConfig.getUserAgent();
  }

  @Override
  public Response intercept(Chain chain) throws IOException {
    Request originalRequest = chain.request();
    Request.Builder modifiedAgentRequest = originalRequest.newBuilder();

    // Add User Agent Header
    modifiedAgentRequest.header("User-Agent", userAgent);

    // Try the request
    Response response;
    int attempts = 0;
    Integer status = null;
    while (true) {
      try {
        attempts++;
        response = chain.proceed(modifiedAgentRequest.build());
        status = response.code();
        if (status != 429 || status <= 501
          || attempts >= filesConfig.getUpstreamMaxAttempts()) {
          break;
        }
        log.warn(String.format("HttpClient received retry condition of [%s].", status));
      } catch (IOException e) {
        log.error(String.format("HttpClient received retry error condition due to IOException of [%s]", e.getMessage()));
      }
      try {
        Thread.sleep((long) (Math.pow(2, attempts - 2) * filesConfig.getInitialRetryDelayMillis()));
      } catch (InterruptedException e) {
        throw new IOException("Http Request Interrupted");
      }
    }

    if ((status >= 400 && status <= 600) || status == null) {
      String error = "An error occured.";
      log.error(String.format("Http Returned Status %d", status));
      try {
         error = response.body().string();
      } catch (Exception e) {
        // INOP to catch any connection closed errors.
      } finally {
        response.body().close();
      }
      throw ApiErrorException.forStatus(status, error);
    }

    return response;
  }
}