package cc.mrbird.security.code.img;

import cc.mrbird.common.domain.FebsConstant;
import cc.mrbird.security.exception.ValidateCodeException;
import cc.mrbird.security.properties.FebsSecurityProperties;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class ImageCodeFilter extends OncePerRequestFilter implements InitializingBean {

    private AuthenticationFailureHandler authenticationFailureHandler;

    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

    private Set<String> url = new HashSet<>();

    private FebsSecurityProperties securityProperties;

    private AntPathMatcher pathMatcher = new AntPathMatcher();

    @Override
    public void afterPropertiesSet() throws ServletException {
        super.afterPropertiesSet();
        String[] configUrls = StringUtils.splitByWholeSeparatorPreserveAllTokens(securityProperties.getCode().getImage().getUrl(), ",");
        url.addAll(Arrays.asList(configUrls));
        url.add(securityProperties.getCode().getImage().getLoginProcessingUrl());
    }

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {

        boolean match = false;
        for (String u : url) {
            if (pathMatcher.match(u, httpServletRequest.getRequestURI())) {
                match = true;
            }
        }
        if (match) {
            try {
                validateCode(new ServletWebRequest(httpServletRequest));
            } catch (ValidateCodeException e) {
                authenticationFailureHandler.onAuthenticationFailure(httpServletRequest, httpServletResponse, e);
                return;
            }
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }

    private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException {
        ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(servletWebRequest, FebsConstant.SESSION_KEY_IMAGE_CODE);
        String codeInRequest = ServletRequestUtils.getStringParameter(servletWebRequest.getRequest(), "imageCode");

        if (StringUtils.isBlank(codeInRequest)) {
            throw new ValidateCodeException("验证码不能为空!");
        }
        if (codeInSession == null) {
            throw new ValidateCodeException("验证码不存在,请重新发送!");
        }
        if (codeInSession.isExpire()) {
            sessionStrategy.removeAttribute(servletWebRequest, FebsConstant.SESSION_KEY_IMAGE_CODE);
            throw new ValidateCodeException("验证码已过期,请重新发送!");
        }
        if (!StringUtils.equalsIgnoreCase(codeInSession.getCode(), codeInRequest)) {
            throw new ValidateCodeException("验证码不正确!");
        }
        sessionStrategy.removeAttribute(servletWebRequest, FebsConstant.SESSION_KEY_IMAGE_CODE);

    }

    public void setAuthenticationFailureHandler(AuthenticationFailureHandler authenticationFailureHandler) {
        this.authenticationFailureHandler = authenticationFailureHandler;
    }

    public void setSecurityProperties(FebsSecurityProperties securityProperties) {
        this.securityProperties = securityProperties;
    }
}