Strongloop loopback如何为新用户分配静态角色

Question

我克隆了一个https://github.com/beeman/loopback-angular-admin 我已经使用环回资源管理器创建了几个新角色，但是如何将角色分配给我创建的用户

我有一个用户模型，它从环回中的用户模型扩展而来 而模型文件是这样的——

{
  "name": "user",
  "plural": "users",
  "base": "User",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {},
  "validations": [],
  "relations": {
    "accessTokens": {
      "type": "hasMany",
      "model": "accessToken",
      "foreignKey": "userId"
    },
    "identities": {
      "type": "hasMany",
      "model": "userIdentity",
      "foreignKey": "userId"
    },
    "credentials": {
      "type": "hasMany",
      "model": "userCredential",
      "foreignKey": "userId"
    },
    "roles": {
      "type": "hasMany",
      "model": "Role",
      "foreignKey": "principalId",
      "through": "RoleMapping"
    }
  },
  "acls": [
    {
      "accessType": "*",
      "principalType": "ROLE",
      "principalId": "admin",
      "permission": "ALLOW"
    },
    {
      "accessType": "READ",
      "principalType": "ROLE",
      "principalId": "$unauthenticated",
      "permission": "DENY"
    },
    {
      "accessType": "READ",
      "principalType": "ROLE",
      "principalId": "$authenticated",
      "permission": "ALLOW"
    },
    {
      "accessType": "*",
      "principalType": "ROLE",
      "principalId": "$owner",
      "permission": "ALLOW"
    }
  ],
  "methods": {}
}

我的 user.js 就像 -

module.exports = function (user) {

  // Set the username to the users email address by default.
  user.observe('before save', function setDefaultUsername(ctx, next) {
    if (ctx.instance) {
      if(ctx.isNewInstance) {
        ctx.instance.username = ctx.instance.email;
      }
      ctx.instance.status = 'created';
      ctx.instance.created = Date.now();
    }
    next();
  });

};

现在，我想根据我从客户端传递的属性 ctx.instance.type 为用户分配角色和主体

Answer 1

假设您已经在 Role 表中创建了一组有限的角色，请使用 after save 挂钩为刚刚创建的用户分配特定的角色：

User.observe('after save', function setRoleMapping(ctx, next) {
  if (ctx.instance) {
    if(ctx.isNewInstance) {

      var RoleMapping = User.app.models.RoleMapping;
      // var roleId = based on type lookup or static?

      RoleMapping.create({
        principalType: "USER",
        principalId: ctx.instance.id,
        roleId: roleId
      }, function(err, roleMapping) {
        if (err) {return console.log(err);}

        // success stuff

      }):

    }
  }
  next();
});

代码未经测试，只是一个大概的想法。您不能使用 before save 挂钩，因为您不知道用于 RoleMapping 表中 principalId 的用户 ID。

更新：版本包括按传入的类型查找角色：

user.observe('after save', function setRoleMapping(ctx, next) {
  if (ctx.instance) {
    if(ctx.isNewInstance) {

      // look up role based on type
      //
      Role.find({where: {name: ctx.instance.type}}, function(err, role) {
        if (err) {return console.log(err);}

        RoleMapping.create({
          principalType: "USER",
          principalId: ctx.instance.id,
          roleId: role.id
        }, function(err, roleMapping) {

          if (err) {return console.log(err);}

          console.log('User assigned RoleID ' + role.id + ' (' + ctx.instance.type + ')');

        }):

      });

    }
  }
  next();
});

查询文档在这里：https://docs.strongloop.com/display/public/LB/Querying+data