534 lines
17 KiB
JavaScript
534 lines
17 KiB
JavaScript
// Copyright IBM Corp. 2014,2016. All Rights Reserved.
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// Node module: loopback
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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'use strict';
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var loopback = require('../../lib/loopback');
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var debug = require('debug')('loopback:security:role');
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var assert = require('assert');
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var async = require('async');
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var utils = require('../../lib/utils');
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var ctx = require('../../lib/access-context');
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var AccessContext = ctx.AccessContext;
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var Principal = ctx.Principal;
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var RoleMapping = loopback.RoleMapping;
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assert(RoleMapping, 'RoleMapping model must be defined before Role model');
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/**
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* The Role model
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* @class Role
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* @header Role object
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*/
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module.exports = function(Role) {
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Role.resolveRelatedModels = function() {
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if (!this.userModel) {
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var reg = this.registry;
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this.roleMappingModel = reg.getModelByType('RoleMapping');
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this.userModel = reg.getModelByType('User');
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this.applicationModel = reg.getModelByType('Application');
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}
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};
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// Set up the connection to users/applications/roles once the model
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Role.once('dataSourceAttached', function(roleModel) {
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['users', 'applications', 'roles'].forEach(function(rel) {
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/**
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* Fetch all users assigned to this role
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* @function Role.prototype#users
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* @param {object} [query] query object passed to model find call
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* @callback {Function} [callback] The callback function
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* @param {String|Error} err The error string or object
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* @param {Array} list The list of users.
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* @promise
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*/
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/**
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* Fetch all applications assigned to this role
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* @function Role.prototype#applications
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* @param {object} [query] query object passed to model find call
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* @callback {Function} [callback] The callback function
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* @param {String|Error} err The error string or object
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* @param {Array} list The list of applications.
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* @promise
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*/
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/**
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* Fetch all roles assigned to this role
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* @function Role.prototype#roles
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* @param {object} [query] query object passed to model find call
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* @callback {Function} [callback] The callback function
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* @param {String|Error} err The error string or object
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* @param {Array} list The list of roles.
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* @promise
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*/
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Role.prototype[rel] = function(query, callback) {
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if (!callback) {
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if (typeof query === 'function') {
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callback = query;
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query = {};
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} else {
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callback = utils.createPromiseCallback();
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}
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}
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query = query || {};
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query.where = query.where || {};
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roleModel.resolveRelatedModels();
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var relsToModels = {
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users: roleModel.userModel,
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applications: roleModel.applicationModel,
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roles: roleModel,
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};
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var ACL = loopback.ACL;
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var relsToTypes = {
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users: ACL.USER,
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applications: ACL.APP,
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roles: ACL.ROLE,
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};
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var principalModel = relsToModels[rel];
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var principalType = relsToTypes[rel];
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// redefine user model and user type if user principalType is custom (available and not "USER")
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var isCustomUserPrincipalType = rel === 'users' &&
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query.where.principalType &&
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query.where.principalType !== RoleMapping.USER;
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if (isCustomUserPrincipalType) {
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var registry = this.constructor.registry;
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principalModel = registry.findModel(query.where.principalType);
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principalType = query.where.principalType;
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}
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// make sure we don't keep principalType in userModel query
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delete query.where.principalType;
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if (principalModel) {
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listByPrincipalType(this, principalModel, principalType, query, callback);
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} else {
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process.nextTick(function() {
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callback(null, []);
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});
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}
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return callback.promise;
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};
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});
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/**
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* Fetch all models assigned to this role
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* @private
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* @param {object} Context role context
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* @param {*} model model type to fetch
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* @param {String} [principalType] principalType used in the rolemapping for model
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* @param {object} [query] query object passed to model find call
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* @param {Function} [callback] callback function called with `(err, models)` arguments.
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*/
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function listByPrincipalType(context, model, principalType, query, callback) {
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if (callback === undefined && typeof query === 'function') {
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callback = query;
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query = {};
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}
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query = query || {};
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roleModel.roleMappingModel.find({
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where: {roleId: context.id, principalType: principalType},
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}, function(err, mappings) {
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var ids;
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if (err) {
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return callback(err);
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}
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ids = mappings.map(function(m) {
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return m.principalId;
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});
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query.where = query.where || {};
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query.where.id = {inq: ids};
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model.find(query, function(err, models) {
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callback(err, models);
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});
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});
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}
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});
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// Special roles
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Role.OWNER = '$owner'; // owner of the object
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Role.RELATED = '$related'; // any User with a relationship to the object
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Role.AUTHENTICATED = '$authenticated'; // authenticated user
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Role.UNAUTHENTICATED = '$unauthenticated'; // authenticated user
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Role.EVERYONE = '$everyone'; // everyone
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/**
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* Add custom handler for roles.
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* @param {String} role Name of role.
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* @param {Function} resolver Function that determines
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* if a principal is in the specified role.
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* Should provide a callback or return a promise.
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*/
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Role.registerResolver = function(role, resolver) {
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if (!Role.resolvers) {
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Role.resolvers = {};
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}
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Role.resolvers[role] = resolver;
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};
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Role.registerResolver(Role.OWNER, function(role, context, callback) {
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if (!context || !context.model || !context.modelId) {
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process.nextTick(function() {
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if (callback) callback(null, false);
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});
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return;
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}
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var modelClass = context.model;
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var modelId = context.modelId;
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var userId = context.getUserId();
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Role.isOwner(modelClass, modelId, userId, callback);
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});
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function isUserClass(modelClass) {
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if (!modelClass) return false;
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var User = modelClass.modelBuilder.models.User;
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if (!User) return false;
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return modelClass == User || modelClass.prototype instanceof User;
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}
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/*!
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* Check if two user IDs matches
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* @param {*} id1
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* @param {*} id2
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* @returns {boolean}
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*/
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function matches(id1, id2) {
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if (id1 === undefined || id1 === null || id1 === '' ||
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id2 === undefined || id2 === null || id2 === '') {
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return false;
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}
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// The id can be a MongoDB ObjectID
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return id1 === id2 || id1.toString() === id2.toString();
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}
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/**
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* Check if a given user ID is the owner the model instance.
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* @param {Function} modelClass The model class
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* @param {*} modelId The model ID
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* @param {*} userId The user ID
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* @callback {Function} [callback] The callback function
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* @param {String|Error} err The error string or object
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* @param {Boolean} isOwner True if the user is an owner.
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* @promise
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*/
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Role.isOwner = function isOwner(modelClass, modelId, userId, callback) {
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assert(modelClass, 'Model class is required');
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if (!callback) callback = utils.createPromiseCallback();
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debug('isOwner(): %s %s userId: %s', modelClass && modelClass.modelName, modelId, userId);
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// No userId is present
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if (!userId) {
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process.nextTick(function() {
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callback(null, false);
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});
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return callback.promise;
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}
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// Is the modelClass User or a subclass of User?
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if (isUserClass(modelClass)) {
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process.nextTick(function() {
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callback(null, matches(modelId, userId));
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});
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return callback.promise;
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}
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modelClass.findById(modelId, function(err, inst) {
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if (err || !inst) {
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debug('Model not found for id %j', modelId);
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if (callback) callback(err, false);
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return;
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}
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debug('Model found: %j', inst);
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var ownerId = inst.userId || inst.owner;
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// Ensure ownerId exists and is not a function/relation
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if (ownerId && 'function' !== typeof ownerId) {
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if (callback) callback(null, matches(ownerId, userId));
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return;
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} else {
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// Try to follow belongsTo
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for (var r in modelClass.relations) {
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var rel = modelClass.relations[r];
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if (rel.type === 'belongsTo' && isUserClass(rel.modelTo)) {
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debug('Checking relation %s to %s: %j', r, rel.modelTo.modelName, rel);
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inst[r](processRelatedUser);
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return;
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}
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}
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debug('No matching belongsTo relation found for model %j and user: %j', modelId, userId);
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if (callback) callback(null, false);
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}
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function processRelatedUser(err, user) {
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if (!err && user) {
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debug('User found: %j', user.id);
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if (callback) callback(null, matches(user.id, userId));
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} else {
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if (callback) callback(err, false);
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}
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}
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});
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return callback.promise;
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};
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Role.registerResolver(Role.AUTHENTICATED, function(role, context, callback) {
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if (!context) {
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process.nextTick(function() {
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if (callback) callback(null, false);
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});
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return;
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}
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Role.isAuthenticated(context, callback);
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});
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/**
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* Check if the user ID is authenticated
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* @param {Object} context The security context.
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*
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* @callback {Function} callback Callback function.
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* @param {Error} err Error object.
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* @param {Boolean} isAuthenticated True if the user is authenticated.
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* @promise
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*/
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Role.isAuthenticated = function isAuthenticated(context, callback) {
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if (!callback) callback = utils.createPromiseCallback();
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process.nextTick(function() {
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if (callback) callback(null, context.isAuthenticated());
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});
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return callback.promise;
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};
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Role.registerResolver(Role.UNAUTHENTICATED, function(role, context, callback) {
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process.nextTick(function() {
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if (callback) callback(null, !context || !context.isAuthenticated());
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});
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});
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Role.registerResolver(Role.EVERYONE, function(role, context, callback) {
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process.nextTick(function() {
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if (callback) callback(null, true); // Always true
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});
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});
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/**
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* Check if a given principal is in the specified role.
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*
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* @param {String} role The role name.
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* @param {Object} context The context object.
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*
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* @callback {Function} callback Callback function.
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* @param {Error} err Error object.
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* @param {Boolean} isInRole True if the principal is in the specified role.
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* @promise
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*/
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Role.isInRole = function(role, context, callback) {
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context.registry = this.registry;
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if (!(context instanceof AccessContext)) {
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context = new AccessContext(context);
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}
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if (!callback) {
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callback = utils.createPromiseCallback();
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// historically, isInRole is returning the Role instance instead of true
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// we are preserving that behaviour for callback-based invocation,
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// but fixing it when invoked in Promise mode
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callback.promise = callback.promise.then(function(isInRole) {
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return !!isInRole;
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});
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}
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this.resolveRelatedModels();
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debug('isInRole(): %s', role);
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context.debug();
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var resolver = Role.resolvers[role];
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if (resolver) {
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debug('Custom resolver found for role %s', role);
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var promise = resolver(role, context, callback);
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if (promise && typeof promise.then === 'function') {
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promise.then(
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function(result) { callback(null, result); },
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callback
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);
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}
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return callback.promise;
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}
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if (context.principals.length === 0) {
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debug('isInRole() returns: false');
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process.nextTick(function() {
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if (callback) callback(null, false);
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});
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return callback.promise;
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}
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var inRole = context.principals.some(function(p) {
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var principalType = p.type || undefined;
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var principalId = p.id || undefined;
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// Check if it's the same role
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return principalType === RoleMapping.ROLE && principalId === role;
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});
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if (inRole) {
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debug('isInRole() returns: %j', inRole);
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process.nextTick(function() {
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if (callback) callback(null, true);
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});
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return callback.promise;
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}
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var roleMappingModel = this.roleMappingModel;
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this.findOne({where: {name: role}}, function(err, result) {
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if (err) {
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if (callback) callback(err);
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return;
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}
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if (!result) {
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if (callback) callback(null, false);
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return;
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}
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debug('Role found: %j', result);
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// Iterate through the list of principals
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async.some(context.principals, function(p, done) {
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var principalType = p.type || undefined;
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var principalId = p.id || undefined;
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var roleId = result.id.toString();
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var principalIdIsString = typeof principalId === 'string';
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if (principalId !== null && principalId !== undefined && !principalIdIsString) {
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principalId = principalId.toString();
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}
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if (principalType && principalId) {
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roleMappingModel.findOne({where: {roleId: roleId,
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principalType: principalType, principalId: principalId}},
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function(err, result) {
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debug('Role mapping found: %j', result);
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done(!err && result); // The only arg is the result
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});
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} else {
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process.nextTick(function() {
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done(false);
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});
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}
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}, function(inRole) {
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debug('isInRole() returns: %j', inRole);
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if (callback) callback(null, inRole);
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});
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});
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return callback.promise;
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};
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/**
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* List roles for a given principal.
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* @param {Object} context The security context.
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*
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* @callback {Function} callback Callback function.
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* @param {Error} err Error object.
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* @param {String[]} roles An array of role IDs
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* @promise
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*/
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Role.getRoles = function(context, options, callback) {
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if (!callback) {
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if (typeof options === 'function') {
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callback = options;
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options = {};
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} else {
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callback = utils.createPromiseCallback();
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}
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}
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if (!options) options = {};
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context.registry = this.registry;
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if (!(context instanceof AccessContext)) {
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context = new AccessContext(context);
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}
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var roles = [];
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this.resolveRelatedModels();
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var addRole = function(role) {
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if (role && roles.indexOf(role) === -1) {
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roles.push(role);
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}
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};
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var self = this;
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// Check against the smart roles
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var inRoleTasks = [];
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Object.keys(Role.resolvers).forEach(function(role) {
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inRoleTasks.push(function(done) {
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self.isInRole(role, context, function(err, inRole) {
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if (debug.enabled) {
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debug('In role %j: %j', role, inRole);
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}
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if (!err && inRole) {
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addRole(role);
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done();
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} else {
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done(err, null);
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}
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});
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});
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});
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var roleMappingModel = this.roleMappingModel;
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context.principals.forEach(function(p) {
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// Check against the role mappings
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var principalType = p.type || undefined;
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var principalId = p.id == null ? undefined : p.id;
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if (typeof principalId !== 'string' && principalId != null) {
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principalId = principalId.toString();
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}
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// Add the role itself
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if (principalType === RoleMapping.ROLE && principalId) {
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addRole(principalId);
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}
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if (principalType && principalId) {
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// Please find() treat undefined matches all values
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inRoleTasks.push(function(done) {
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var filter = {where: {principalType: principalType, principalId: principalId}};
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if (options.returnOnlyRoleNames === true) {
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filter.include = ['role'];
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}
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roleMappingModel.find(filter, function(err, mappings) {
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debug('Role mappings found: %s %j', err, mappings);
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if (err) {
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if (done) done(err);
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return;
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}
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mappings.forEach(function(m) {
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var role;
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if (options.returnOnlyRoleNames === true) {
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role = m.toJSON().role.name;
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} else {
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role = m.roleId;
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}
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addRole(role);
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});
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if (done) done();
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});
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});
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}
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});
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async.parallel(inRoleTasks, function(err, results) {
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debug('getRoles() returns: %j %j', err, roles);
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if (callback) callback(err, roles);
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});
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return callback.promise;
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};
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Role.validatesUniquenessOf('name', {message: 'already exists'});
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};
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