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package org.zodiac.boot.request;

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.zodiac.commons.util.lang.Strings;
import org.zodiac.commons.util.web.ServletRequests;
import org.zodiac.sdk.toolkit.util.lang.StrUtil;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * XSS过滤
 *
 */
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {

    /*
     * 没被包装过的HttpServletRequest（特殊场景,需要自己过滤）
     */
    private final HttpServletRequest orgRequest;
    /*
     * 缓存报文,支持多次读取流
     */
    private byte[] body;
    /*
     * html过滤
     */
    private final static XssHtmlFilter HTML_FILTER = new XssHtmlFilter();

    public XssHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        orgRequest = request;
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        if (super.getHeader(HttpHeaders.CONTENT_TYPE) == null) {
            return super.getInputStream();
        }

        if (super.getHeader(HttpHeaders.CONTENT_TYPE).startsWith(MediaType.MULTIPART_FORM_DATA_VALUE)) {
            return super.getInputStream();
        }

        if (body == null) {
            body = xssEncode(ServletRequests.getRequestBody(super.getInputStream())).getBytes();
        }

        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);

        return new ServletInputStream() {

            @Override
            public int read() {
                return byteArrayInputStream.read();
            }

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {}
        };
    }

    @Override
    public String getParameter(String name) {
        String value = super.getParameter(xssEncode(name));
        if (StrUtil.isNotBlank(value)) {
            value = xssEncode(value);
        }
        return value;
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] parameters = super.getParameterValues(name);
        if (parameters == null || parameters.length == 0) {
            return null;
        }

        for (int i = 0; i < parameters.length; i++) {
            parameters[i] = xssEncode(parameters[i]);
        }
        return parameters;
    }

    @Override
    public Map getParameterMap() {
        Map map = new LinkedHashMap<>();
        Map parameters = super.getParameterMap();
        for (String key : parameters.keySet()) {
            String[] values = parameters.get(key);
            for (int i = 0; i < values.length; i++) {
                values[i] = xssEncode(values[i]);
            }
            map.put(key, values);
        }
        return map;
    }

    @Override
    public String getHeader(String name) {
        String value = super.getHeader(xssEncode(name));
        if (StrUtil.isNotBlank(value)) {
            value = xssEncode(value);
        }
        return value;
    }

    private String xssEncode(String input) {
        return HTML_FILTER.filter(input);
    }

    /**
     * 获取初始request。
     *
     * @return HttpServletRequest
     */
    public HttpServletRequest getOrgRequest() {
        return orgRequest;
    }

    /**
     * 获取初始request。
     *
     * @param request request
     * @return HttpServletRequest
     */
    public static HttpServletRequest getOrgRequest(HttpServletRequest request) {
        if (request instanceof XssHttpServletRequestWrapper) {
            return ((XssHttpServletRequestWrapper)request).getOrgRequest();
        }
        return request;
    }

}