mongoose-authorization


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

npm install --save mongoose-authorization

Getting Started

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

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
},
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]

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.

`javascript
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:

`javascript
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.

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

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

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

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

#### 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.

`javascript
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

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


example find

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