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/*******************************************************************************
 * Copyright 2015-2024 Sergey Karpushin
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package org.summerb.webappboilerplate.utils;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.support.RequestContextUtils;

/**
 * Utility methods providing information related to current request
 *
 * @author sergey.karpushin
 */
public class CurrentRequestUtils {
  protected static Logger log = LoggerFactory.getLogger(CurrentRequestUtils.class);
  protected static Locale defaultLocale = new Locale("en", "US");

  /**
   * Get current request
   *
   * @return
   */
  public static HttpServletRequest get() {
    ServletRequestAttributes ra =
        (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
    return ra.getRequest();
  }

  /**
   * Get locale for curent request
   *
   * @return
   */
  public static Locale getLocale() {
    // Plan A: Try to get it from locale context holder
    Locale locale = LocaleContextHolder.getLocale();
    if (locale != null) {
      return locale;
    }

    // Plan B: Try to get it from request
    HttpServletRequest request = get();
    LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
    if (localeResolver == null) {
      log.warn("Cannot get locale resolver. Will fallback to: " + defaultLocale);
      return defaultLocale;
    }
    locale = localeResolver.resolveLocale(request);
    if (locale != null) {
      return locale;
    }

    // fallback
    log.warn("Cannot resolve locale. Will fallback to: " + defaultLocale);
    return defaultLocale;
  }

  /**
   * @deprecated WARNING this method won't work correctly in async environment (like i.e. when using
   *     DeferredResult)
   */
  @Deprecated
  public static WebApplicationContext getWac() {
    return RequestContextUtils.findWebApplicationContext(get());
  }

  public static String getBaseUrl() {
    HttpServletRequest req = get();
    String ret =
        req.getScheme()
            + "://"
            + req.getServerName()
            + ":"
            + req.getServerPort()
            + req.getContextPath();
    return ret;
  }
}