我如何使我的代码生成用于用户授权和许可的JWT令牌?

问题描述 投票:0回答:1

我不知道如何进行这项工作。我有两个文件,permissionCtrl.jstokenCtrl.js。我正在使用nJWT,Node.js / Express.js,Sequelize和Postgres。

许可文件包含链接到令牌文件的hasPermission函数。 hasPermission函数应该检查在令牌文件中生成的令牌,并返回成功回调的结果或下面显示的消息的403响应。成功后,它将根据用户的角色和访问级别向用户授予对安全路由的访问权限。请注意,tokenCtrl.hasPermission.js已导入到此文件。

hasPermission.js

exports.hasPermission = (req, res, permission, success) => {
  const token = req.get('Authorization');
  const hasPermission = tokenCtrl.hasPermission(token, permission); //tokenCtrl.hasPermission not a function error here
  console.log('permission', permission);
  if (hasPermission) {
    return success();
  } else {
    res.status(403);
    return res.json({
      error: {
        status: 403,
        message: 'Unauthorized',
      },
    });
  }
};

tokenCtrl.js

const nJwt = require('njwt');
const secureRandom = require('secure-random');
const signingKey = secureRandom(512, {type: 'Buffer'}); // Create a highly random byte array of 256 bytes
const base64SigningKey = signingKey.toString('base64');

const claims = {
  iss: "mysite.com",  // The URL of your service
  sub: "users/user1234",    // The UID of the user in your system
  scope: "user, admins"
};

module.exports = {

  // Returns token
  getToken: (claims, signingKey) => {
    const jwt = nJwt.create(claims, signingKey, 'HS512');
    console.log(jwt);
    const token = jwt.compact();
     console.log("Token :" + token);
    return (token);
},

  // Returns result of token validation
    validateToken: (token, signingKey) => {
      nJwt.verify(token, signingKey, 'HS512', function(err, verifiedJwt){
        if(err){
          console.log(err); // Token has expired, has been tampered with, etc
        }else{
          console.log(verifiedJwt); // Will contain the header and body
        }
        return (verifiedJwt);
      });
  },

  token_post: (req, res) => {
  res.send(this.validateToken(req.header.Authorization, signingKey));
},

getSecret: () => {
  const secret = require('../config/secret.json').secret;
  console.log('secret', secret);
  return secret;
},

hasPermission: (token, resource) => {
  const result = this.validateToken(token, signingKey); //this.validateToken not a function error here
  console.log(result);
  if (result.name === 'JsonWebTokenError') {
    return false;
  } else if (result.permissions) {
    let permissionSet = new Set(result.permissions);
    console.log('permissions in token', JSON.stringify(permissionSet));
    return permissionSet.has(resource);
  } else {
    return false;
  }
}

}

错误

  1. this.validateToken不是此处的函数错误,如代码注释所示

  2. tokenCtrl.hasPermission不是函数错误,如代码注释中所示

注意:tokenCtrl文件中的getSecret函数正在被其他文件使用。

javascript node.js express jwt
1个回答
0
投票

您在this如何绑定箭头功能方面犯规。先前的函数在其内部范围内创建了一个新的空this,在箭头函数this中将其绑定到封闭范围。因为您是在导出对象中声明函数,所以您可能希望this绑定到封闭的对象,但没有。

我建议只声明您的函数,然后将它们添加到导出中。这样,您可以避免使用this,而只需调用validateToken函数。

const validateToken = (token, signingKey) => {
      nJwt.verify(token, signingKey, 'HS512', function(err, verifiedJwt){
        if(err){
          console.log(err); // Token has expired, has been tampered with, etc
        }else{
          console.log(verifiedJwt); // Will contain the header and body
        }
        return (verifiedJwt);
      });
  };

const hasPermission = (token, resource) => {
  const result = validateToken(token, signingKey); //this.validateToken not a function error here
  console.log(result);
  if (result.name === 'JsonWebTokenError') {
    return false;
  } else if (result.permissions) {
    let permissionSet = new Set(result.permissions);
    console.log('permissions in token', JSON.stringify(permissionSet));
    return permissionSet.has(resource);
  } else {
    return false;
  }
};

module.exports = {
  vaildiateToken,
  hasPermission
}
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