Injects a User-Agent header into outgoing OkHttp requests.

UserAgentInterceptor.java

package com.enlighthq.mobile.http;

import android.os.Build;

import java.io.IOException;
import java.util.Locale;

import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

/**
 * Adds a custom {@code User-Agent} header to OkHttp requests.
 */
public class UserAgentInterceptor implements Interceptor {

  public final String userAgent;

  public UserAgentInterceptor(String userAgent) {
    this.userAgent = userAgent;
  }

  public UserAgentInterceptor(String appName, String appVersion) {
    this(String.format(Locale.US,
        "%s/%s (Android %s; %s; %s %s; %s)",
        appName,
        appVersion,
        Build.VERSION.RELEASE,
        Build.MODEL,
        Build.BRAND,
        Build.DEVICE,
        Locale.getDefault().getLanguage()));
  }

  @Override
  public Response intercept(Chain chain) throws IOException {
    Request userAgentRequest = chain.request()
        .newBuilder()
        .header("User-Agent", userAgent)
        .build();
    return chain.proceed(userAgentRequest);
  }
}