mongoose-authz

This plugin allows you to define a custom authorization scheme on your mongoose models.

npm install --save mongoose-authz

Getting Started

'use strict';
var mongoose = require('mongoose');
var authz = require('mongoose-authz');

var userSchema = new mongoose.Schema({
  email: {
    type: String,
    required: true,
    unique: true
  },
  first_name: {
    type: String,
    required: true
  },
  last_name: {
    type: String,
    required: true
  },
  avatar: {
    type: String
  },
  last_login_date: {
    type: Date
  },
  status: {
    type: String,
    required: true,
    default: 'active'
  }
});

/*
 * Make sure you add this before compiling your model
 */
userSchema.permissions = {
  defaults: {
    read: ['email', 'first_name', 'last_name', 'avatar']
  },
  admin: {
    read: ['status'],
    write: ['status'],
    create: true,
    actions: ['merge'],
  },
  owner: {
    read: ['status'],
    write: ['email', 'first_name', 'last_name', 'avatar'],
    remove: true
  }
};

userSchema.plugin(authz);

module.exports = mongoose.model('users', userSchema);

In the example above we extended the userSchema by adding a permissions object. This will not persist to your documents.

The permissions object consists of properties that represent your authorization levels (or groups). For each group, there are 4 permissions you can configure.

create - Boolean
remove - Boolean
write - [array of fields] NOTE: if upsert: true, the group will need to have create permissions too
read - [array of fields]
actions - An array or arbitrary strings that lets you define more complicated actions (usually involving multiple fields or documents) that are allowed. Your own application code will need to handle the updates (likely disabling field level checking for those updates).

You can also specify a defaults group, which represents permissions that are available to all groups.

If you need the document in order to determine the correct authorization level for an action, you can place a static getAuthLevel function directly in your schema. For applicable actions, this function will be called with a specific document and a payload of data specified in the query. This is useful when the authorization level depends on matching properties of a user with properties of a specific document to determine if that user can modify that document.

NOTE: The `getAuthLevel` approach does not work for update or remove queries since the document is not loaded into memory.

var mongoose = require('mongoose');

var carSchema = new mongoose.Schema({
    make: {
        type: String,
        required: true,
        unique: true
      },
    model: {
        type: String,
        required: true
      },
    year: {
        type: Number
      },
    plate: {
        type: String
      }
  });

/*
 * Make sure you add this before compiling your model
 */
carSchema.permissions = {
    defaults: {
        read: ['_id', 'make', 'model', 'year']
      },
    maker: {
        write: ['make', 'model', 'year'],
        remove: true
      },
    dealer: {
        read: ['plate'],
        write: ['plate']
      }
  };

carSchema.getAuthLevel = function (payload, doc) {
    if (payload && doc && payload.companyName === doc.make) {
        return 'maker';
    }

    return 'dealer';
}

In you application code, you could then do the following:

Car.find({}, null, { authPayload: { companyName: 'Toyota' } }).exec(...);

// or

myCar.save({ authPayload: { companyName: 'Honda' } });

You can also have the permissions for a specific document injected into the document when returned from a find query using the permissions option on the query. The permissions will be inserted into the object using the key permissions unless you specify the desired key name as the permissions option.

const user = await User.find().setOptions({ authLevel: 'admin': permissions: true }).exec();

console.log(user.permissions);
// Outputs:
// {
//   read: [...],
//   write: [...],
//   remove: [boolean],
//   actions: [...],
// }

// OR
const user = await User.find().setOptions({ authLevel: 'admin': permissions: 'foo' }).exec();

console.log(user.foo);
// Outputs:
// {
//   read: [...],
//   write: [...],
//   remove: [boolean],
//   actions: [...],
// }

Example Uses

NOTE: If no authLevel is able to be determined, permission to perform the action will be denied. If you would like to circumvent authorization, pass `false` as the authLevel (e.g. `myModel.find().setAuhtLevel(false).exec();`, which will disable authorization for that specific query).

example update

You can also specify an array of authentication levels. This would merge the settings of each auth level.

users.update({user_id: userUpdate.user_id}, userUpdate, {
  authLevel: 'admin'
}, function(err, doc) {
  if (err) {
    //handle error
  } else {
    //success
  }
});

NOTE: When using `findOneAndUpdate`, the return document will be sanitized based on the group's permissions for `read`

await users.findOneAndUpdate(
  { user_id: userUpdate.user_id },
  userUpdate,
  { authLevel: 'admin'}
);

example find

await users.find(
  { user_id: userUpdate.user_id },
  null,
  { authLevel: 'admin' }
);

devcolor/mongoose-authz

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