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我們使用JwtAccessTokenConverter來生成Jwt Token,JwtAccessTokenConverter默認使用的Signer是macSigner，而MacSigner默認的算法是HMACSHA256。下面這個地方配置的Signkey一定要與上面配置EMQX的JWT認證時的Secret一致，這樣就可以讓EMQX驗證Token的真假。

背景

RuoYi是一款基于Spring Boot、Spring Security和MyBatis的快速開發(fā)框架，它目前在中后臺管理系統(tǒng)開發(fā)領(lǐng)域擁有大量的使用者。但是它當(dāng)前缺少對websocket協(xié)議雙工通信信道的支持，即長鏈接管理這塊的功能比較弱。導(dǎo)致像實時通知（后臺服務(wù)與前端的消息推送，異步通知），實時數(shù)據(jù)可視化（后端獲取數(shù)據(jù)并推送到前端）等功能不好實現(xiàn)。本文介紹如果結(jié)合第三方消息代理服務(wù)器EMQX實現(xiàn)上述功能。

準(zhǔn)備

Docker安裝EMQX

docker pull emqx/emqx:5.0.21

docker run -d --name emqx -p 1883:1883 -p 8083:8083 -p 8084:8084 -p 8883:8883 -p 18083:18083 emqx:5.0.21

EMQX訪問配置

登錄EMQX后臺，點擊菜單Access Control ->Authentication。

新增配置，選擇JWT,因為RuoYi的框架使用的是JWT,這個地方就是讓EMQX的認證方式和RuoYi的一致，這樣RuoYi返回的token,我們可以直接通過它來調(diào)用EMQX的restful接口，實現(xiàn)發(fā)送消息。

新增配置認證

登錄EMQX管理后臺，配置認證

其中JWT from這個地方我們選擇username,然后算法根據(jù)你的RuoYi框架實現(xiàn)的token的算法，這個地方我們使用的是hmac.其他的實踐可以查看這https://www.emqx.io/docs/en/v5.0/access-control/authn/jwt.html#configure-with-dashboard。

配置RuoYi的token生成

我們使用JwtAccessTokenConverter來生成jwt token,JwtAccessTokenConverter默認使用的signer是MacSigner，而MacSigner默認的算法是HMACSHA256。下面這個地方配置的signkey一定要與上面配置EMQX的JWT認證時的Secret一致，這樣就可以讓EMQX驗證token的真假。

@Bean
public JwtAccessTokenConverter jwtAccessTokenConverter() {
    JwtAccessTokenConverter converter = new JwtAccessTokenConverter();
    converter.setSigningKey("mytokenkey");// token key
    converter.setAccessTokenConverter(new NewTokenConverter());
    return converter;
}

JwtAccessTokenConverter的signer

我們想擴展ken的額外信息，便可以繼承AccessTokenConverter，寫一個新的。在這個轉(zhuǎn)化器中，我們可以加入額外的屬性identity，這樣token里面就包含了這些有用的信息。

package com.ruoyi.framework.auth.config.tokenconvert;

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.oauth2.common.DefaultOAuth2AccessToken;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.OAuth2Request;
import org.springframework.security.oauth2.provider.token.AccessTokenConverter;
import org.springframework.security.oauth2.provider.token.DefaultUserAuthenticationConverter;
import org.springframework.security.oauth2.provider.token.UserAuthenticationConverter;

import JAVA.util.*;

public class NewTokenConverter implements AccessTokenConverter {
  private UserAuthenticationConverter userTokenConverter = new DefaultUserAuthenticationConverter();
  private boolean includeGrantType;
  private String scopeAttribute = "scope";
  private String clientIdAttribute = "client_id";

  public NewTokenConverter() {
  }

  public void setUserTokenConverter(UserAuthenticationConverter userTokenConverter) {
    this.userTokenConverter = userTokenConverter;
  }

  public void setIncludeGrantType(boolean includeGrantType) {
    this.includeGrantType = includeGrantType;
  }

  public void setScopeAttribute(String scopeAttribute) {
    this.scopeAttribute = scopeAttribute;
  }

  public void setClientIdAttribute(String clientIdAttribute) {
    this.clientIdAttribute = clientIdAttribute;
  }

  public Map<String, ?> convertAccessToken(OAuth2AccessToken token, OAuth2Authentication authentication) {
    Map<String, Object> response = new HashMap();
    OAuth2Request clientToken = authentication.getOAuth2Request();
    if (!authentication.isClientOnly()) {
      response.putAll(this.userTokenConverter.convertUserAuthentication(authentication.getUserAuthentication()));
    } else if (clientToken.getAuthorities() != null && !clientToken.getAuthorities().isEmpty()) {
      response.put("authorities", AuthorityUtils.authorityListToSet(clientToken.getAuthorities()));
    }

    if (token.getScope() != null) {
      response.put(this.scopeAttribute, token.getScope());
    }

    if (token.getAdditionalInformation().contAInsKey("jti")) {
      response.put("jti", token.getAdditionalInformation().get("jti"));
    }

    if (token.getExpiration() != null) {
      response.put("exp", token.getExpiration().getTime() / 1000L);
    }
    if (authentication.getName()!=null) {
      response.put("identity", authentication.getName());
    }

    if (this.includeGrantType && authentication.getOAuth2Request().getGrantType() != null) {
      response.put("grant_type", authentication.getOAuth2Request().getGrantType());
    }

    response.putAll(token.getAdditionalInformation());
    response.put(this.clientIdAttribute, clientToken.getClientId());
    if (clientToken.getResourceIds() != null && !clientToken.getResourceIds().isEmpty()) {
      response.put("aud", clientToken.getResourceIds());
    }

    return response;
  }

  public OAuth2AccessToken extractAccessToken(String value, Map<String, ?> map) {
    DefaultOAuth2AccessToken token = new DefaultOAuth2AccessToken(value);
    Map<String, Object> info = new HashMap(map);
    info.remove("exp");
    info.remove("aud");
    info.remove(this.clientIdAttribute);
    info.remove(this.scopeAttribute);
    if (map.containsKey("exp")) {
      token.setExpiration(new Date((Long)map.get("exp") * 1000L));
    }

    if (map.containsKey("jti")) {
      info.put("jti", map.get("jti"));
    }

    token.setScope(this.extractScope(map));
    token.setAdditionalInformation(info);
    return token;
  }

  public OAuth2Authentication extractAuthentication(Map<String, ?> map) {
    Map<String, String> parameters = new HashMap();
    Set<String> scope = this.extractScope(map);
    Authentication user = this.userTokenConverter.extractAuthentication(map);
    String clientId = (String)map.get(this.clientIdAttribute);
    parameters.put(this.clientIdAttribute, clientId);
    if (this.includeGrantType && map.containsKey("grant_type")) {
      parameters.put("grant_type", (String)map.get("grant_type"));
    }

    Set<String> resourceIds = new LinkedHashSet((Collection)(map.containsKey("aud") ? this.getAudience(map) : Collections.emptySet()));
    Collection<? extends GrantedAuthority> authorities = null;
    if (user == null && map.containsKey("authorities")) {
      String[] roles = (String[])((Collection)map.get("authorities")).toArray(new String[0]);
      authorities = AuthorityUtils.createAuthorityList(roles);
    }

    OAuth2Request request = new OAuth2Request(parameters, clientId, authorities, true, scope, resourceIds, (String)null, (Set)null, (Map)null);
    return new OAuth2Authentication(request, user);
  }

  private Collection<String> getAudience(Map<String, ?> map) {
    Object auds = map.get("aud");
    if (auds instanceof Collection) {
      Collection<String> result = (Collection)auds;
      return result;
    } else {
      return Collections.singleton((String)auds);
    }
  }

  private Set<String> extractScope(Map<String, ?> map) {
    Set<String> scope = Collections.emptySet();
    if (map.containsKey(this.scopeAttribute)) {
      Object scopeObj = map.get(this.scopeAttribute);
      if (String.class.isInstance(scopeObj)) {
        scope = new LinkedHashSet(Arrays.asList(((String)String.class.cast(scopeObj)).split(" ")));
      } else if (Collection.class.isAssignableFrom(scopeObj.getClass())) {
        Collection<String> scopeColl = (Collection)scopeObj;
        scope = new LinkedHashSet(scopeColl);
      }
    }

    return (Set)scope;
  }
}

客戶端連接

npm install --save mqtt

import mqtt from 'mqtt'
createWebSocket() {

  const clientId = 'mqttjs_' + Math.random().toString(16).substr(2, 8)

  const host = process.env.VUE_App_WEB_SOCKET

  const options = {
    keepalive: 60,
    clientId: clientId,
    username:getToken(),
    protocolId: 'MQTT',
    protocolVersion: 4,
    clean: true,
    reconnectPeriod: 1000,
    connectTimeout: 30 * 1000,
    will: {
      topic: 'WillMsg',
      payload: 'Connection Closed abnormally..!',
      qos: 0,
      retain: false
    },
  }

  console.log('Connecting mqtt client')

  this.ws = mqtt.connect(host, options)

  this.ws.on('error', (err) => {
    console.log('Connection error: ', err)
    this.ws.end()
  })

  this.ws.on('reconnect', () => {
    console.log('Reconnecting...')
  })

  this.ws.on('connect', () => {
    console.log('Client connected:' + clientId)
    // Subscribe
    this.ws.subscribe(store.getters.topic, { qos: 0 })
  })

  // Received
  this.ws.on('message', (topic, message, packet) => {
    console.log('Received Message: ' + message.toString() + 'nOn topic: ' + topic)
  })
},