/*
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* Copyright (c) 2018-2028, DreamLu All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: DreamLu 卢春梦 (596392912@qq.com)
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*/
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package org.springblade.core.context;
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import lombok.RequiredArgsConstructor;
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import org.springblade.core.context.props.BladeContextProperties;
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import org.springblade.core.tool.utils.StringUtil;
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import org.springblade.core.tool.utils.WebUtil;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
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import org.springframework.http.HttpHeaders;
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import org.springframework.lang.Nullable;
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import javax.servlet.http.HttpServletRequest;
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import java.util.Enumeration;
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import java.util.List;
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/**
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* HttpHeaders 获取器
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*
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* @author L.cm
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*/
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@RequiredArgsConstructor
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@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
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public class ServletHttpHeadersGetter implements BladeHttpHeadersGetter {
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private final BladeContextProperties properties;
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@Nullable
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@Override
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public HttpHeaders get() {
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HttpServletRequest request = WebUtil.getRequest();
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if (request == null) {
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return null;
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}
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return get(request);
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}
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@Nullable
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@Override
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public HttpHeaders get(HttpServletRequest request) {
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HttpHeaders headers = new HttpHeaders();
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List<String> crossHeaders = properties.getCrossHeaders();
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// 传递请求头
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Enumeration<String> headerNames = request.getHeaderNames();
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if (headerNames != null) {
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List<String> allowed = properties.getHeaders().getAllowed();
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while (headerNames.hasMoreElements()) {
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String key = headerNames.nextElement();
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// 只支持配置的 header
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if (crossHeaders.contains(key) || allowed.contains(key)) {
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String values = request.getHeader(key);
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// header value 不为空的 传递
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if (StringUtil.isNotBlank(values)) {
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headers.add(key, values);
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}
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}
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}
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}
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return headers;
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}
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}
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