Define the models/relations for ACL

lib/models/acl.js

@@ -33,12 +33,15 @@
 
 var loopback = require('../loopback');
 
+/**
+ * Schema for Scope which represents the permissions that are granted to client applications by the resource owner
+ */
 var ScopeSchema = {
   name: {type: String, required: true},
   description: String
 };
 
-var ScopeResourceAccessSchema = {
+var ScopeACLSchema = {
   model: String, // The name of the model
   property: String, // The name of the property, method, scope, or relation
 
@@ -57,7 +60,7 @@ var ScopeResourceAccessSchema = {
   scopeId: Number
 };
 
-var ScopeResourceAccess = loopback.createModel('ScopeResourceAccess', ScopeResourceAccessSchema, {
+var ScopeACL = loopback.createModel('ScopeACL', ScopeACLSchema, {
   relations: {
     scope: {
       type: 'belongsTo',
@@ -68,6 +71,10 @@ var ScopeResourceAccess = loopback.createModel('ScopeResourceAccess', ScopeResou
 });
 
 /**
+ * Resource owner grants/delegates permissions to client applications
+ *
+ * For a protected resource, does the client application have the authorization from the resource owner (user or system)?
+ *
  * Scope has many resource access entries
  * @type {createModel|*}
  */
@@ -75,12 +82,21 @@ var Scope = loopback.createModel('Scope', ScopeSchema, {
   relations: {
     resources: {
       type: 'hasMany',
-      model: 'ScopeResourceAccess',
+      model: 'ScopeACL',
       foreignKey: 'scopeId'
     }
   }
 });
 
+/**
+ * System grants permissions to principals (users/applications, can be grouped into roles).
+ *
+ * Protected resource: the model data and operations (model/property/method/relation/…)
+ *
+ * For a given principal, such as client application and/or user, is it allowed to access (read/write/execute)
+ * the protected resource?
+ *
+ */
 var ACLSchema = {
   model: String, // The name of the model
   property: String, // The name of the property, method, scope, or relation
@@ -112,32 +128,72 @@ var ACL = loopback.createModel('ACL', ACLSchema);
 module.exports = {
   ACL: ACL,
   Scope: Scope,
-  ScopeResourceAccess: ScopeResourceAccess
+  ScopeACL: ScopeACL
 };
 
-Scope.isAllowed = function (scope, model, property, accessType, callback) {
+/**
+ * Check if the given principal is allowed to access the model/property
+ * @param principalType
+ * @param principalId
+ * @param model
+ * @param property
+ * @param accessType
+ * @param callback
+ */
+ACL.checkPermission = function (principalType, principalId, model, property, accessType, callback) {
+  ACL.find({where: {principalType: principalType, principalId: principalId,
+      model: model, property: {inq: [property, '*']}, accessType: {inq: [accessType, '*']}}},
+    function (err, acls) {
+      if (err) {
+        callback && callback(err);
+        return;
+      }
+      var resolvedPermission = acls.reduce(function (previousValue, currentValue, index, array) {
+        // If the property is the same or the previous one is '*' (ALL)
+        if (previousValue.property === currentValue.property || (previousValue.property === '*' && currentValue.property)) {
+          previousValue.property = currentValue.property;
+          if (previousValue.accessType === currentValue.accessType || (previousValue.accessType === '*' && currentValue.accessType)) {
+            previousValue.accessType = currentValue.accessType;
+          }
+        }
+        return previousValue;
+      }, {principalType: principalType, principalId: principalId, model: model, property: '*', accessType: '*', permission: 'Allow'});
+      callback && callback(resolvedPermission);
+    });
+};
+
+/**
+ * Check if the given scope is allowed to access the model/property
+ * @param scope
+ * @param model
+ * @param property
+ * @param accessType
+ * @param callback
+ */
+Scope.checkPermission = function (scope, model, property, accessType, callback) {
   Scope.findOne({where: {name: scope}}, function (err, scope) {
     if (err) {
       callback && callback(err);
     } else {
-      scope.resources({where: {model: model, property: {inq: [property, '*']}, accessType: {inq: [accessType, '*']}}}, function (err, resources)
+      scope.resources({where: {model: model, property: {inq: [property, '*']}, accessType: {inq: [accessType, '*']}}}, function (err, resources) {
-      {
           if (err) {
             callback && callback(err);
-        } else {
-          console.log('Resources: ', resources);
-          for (var r = 0; r < resources.length; r++) {
-            if (resources[r].permission === 'Allow') {
-              callback && callback(null, true);
             return;
           }
+          // Try to resolve the permission
+          var resolvedPermission = resources.reduce(function (previousValue, currentValue, index, array) {
+            // If the property is the same or the previous one is '*' (ALL)
+            if (previousValue.property === currentValue.property || (previousValue.property === '*' && currentValue.property)) {
+              previousValue.property = currentValue.property;
+              if (previousValue.accessType === currentValue.accessType || (previousValue.accessType === '*' && currentValue.accessType)) {
+                previousValue.accessType = currentValue.accessType;
               }
-          callback && callback(null, false);
             }
-
+            return previousValue;
+          }, {model: model, property: '*', accessType: '*', permission: 'Allow'});
+          callback && callback(resolvedPermission);
         }
-    )
+      );
-      ;
     }
   });
 };

lib/models/role.js

@@ -5,36 +5,112 @@ var RoleSchema = {
   id: {type: String, id: true}, // Id
   name: {type: String, required: true}, // The name of a role
   description: String, // Description
-  // roles: [String], // A role can be an aggregate of other roles
-  // users: [String], // A role contains a list of user ids
 
-  parent: String,
   // Timestamps
   created: {type: Date, default: Date},
   modified: {type: Date, default: Date}
 };
 
-var Role = loopback.createModel('Role', RoleSchema, {
+/**
+ * Map principals to roles
+ */
+var RoleMappingSchema = {
+  id: {type: String, id: true}, // Id
+  roleId: String, // The role id
+  principalType: String, // The principal type, such as user, application, or role
+  principalId: String // The principal id
+};
+
+var RoleMapping = loopback.createModel('RoleMapping', RoleMappingSchema, {
   relations: {
-    roles: {
+    role: {
-      type: 'hasMany',
+      type: 'belongsTo',
       model: 'Role',
-      foreignKey: 'parent'
+      foreignKey: 'roleId'
-    },
-    users: {
-      type: 'hasAndBelongsToMany',
-      model: 'user',
-      foreignKey: 'userId'
-    },
-    applications: {
-      type: 'hasAndBelongsToMany',
-      model: 'Application',
-      foreignKey: 'appId'
     }
   }
 });
 
-module.exports = Role;
+RoleMapping.prototype.application = function(callback) {
+  if(this.principalType === 'application') {
+    loopback.Application.findById(this.principalId, callback);
+  } else {
+    process.nextTick(function() {
+      callback && callback(null, null);
+    });
+  }
+};
+
+RoleMapping.prototype.user = function(callback) {
+  if(this.principalType === 'user') {
+    loopback.User.findById(this.principalId, callback);
+  } else {
+    process.nextTick(function() {
+      callback && callback(null, null);
+    });
+  }
+};
+
+RoleMapping.prototype.childRole = function(callback) {
+  if(this.principalType === 'role') {
+    loopback.User.findById(this.principalId, callback);
+  } else {
+    process.nextTick(function() {
+      callback && callback(null, null);
+    });
+  }
+};
+
+var Role = loopback.createModel('Role', RoleSchema, {
+  relations: {
+    principals: {
+      type: 'hasMany',
+      model: 'RoleMapping',
+      foreignKey: 'roleId'
+    }
+  }
+});
+
+
+Role.once('dataSourceAttached', function() {
+  Role.prototype.users = function(callback) {
+    RoleMapping.find({where: {roleId: this.id, principalType: 'user'}}, function(err, mappings) {
+      if(err) {
+        callback && callback(err);
+        return;
+      }
+      return mappings.map(function(m) {
+        return m.principalId;
+      });
+    });
+  };
+
+  Role.prototype.applications = function(callback) {
+    RoleMapping.find({where: {roleId: this.id, principalType: 'application'}}, function(err, mappings) {
+      if(err) {
+        callback && callback(err);
+        return;
+      }
+      return mappings.map(function(m) {
+        return m.principalId;
+      });
+    });
+  };
+
+  Role.prototype.roles = function(callback) {
+    RoleMapping.find({where: {roleId: this.id, principalType: 'role'}}, function(err, mappings) {
+      if(err) {
+        callback && callback(err);
+        return;
+      }
+      return mappings.map(function(m) {
+        return m.principalId;
+      });
+    });
+  };
+
+});
+
 
 // Special roles
 Role.OWNER = '$owner'; // owner of the object
@@ -42,3 +118,47 @@ Role.RELATED = "$related"; // any User with a relationship to the object
 Role.AUTHENTICATED = "$authenticated"; // authenticated user
 Role.EVERYONE = "$everyone"; // everyone
 
+/**
+ * Check if a given principal is in the role
+ *
+ * @param principalType
+ * @param principalId
+ * @param role
+ * @param callback
+ */
+Role.isInRole = function(principalType, principalId, role, callback) {
+  Role.findOne({where: {name: role}}, function(err, role) {
+    if(err) {
+      callback && callback(err);
+      return;
+    }
+    RoleMapping.exists({where: {roleId: role.id, principalType: principalType, principalId: principalId}}, callback);
+  });
+};
+
+/**
+ * List roles for a given principal
+ * @param principalType
+ * @param principalId
+ * @param role
+ * @param callback
+ */
+Role.getRoles = function(principalType, principalId, role, callback) {
+  RoleMapping.find({where: {principalType: principalType, principalId: principalId}},function(err, mappings) {
+    if(err) {
+      callback && callback(err);
+      return;
+    }
+    var roles = [];
+    mappings.forEach(function(m) {
+      roles.push(m.roleId);
+    });
+    callback && callback(null, roles);
+  });
+};
+
+module.exports = {
+  Role: Role,
+  RoleMapping: RoleMapping
+};
+

test/acl.test.js

@@ -1,27 +1,69 @@
 var assert = require('assert');
 var loopback = require('../index');
 var acl = require('../lib/models/acl');
+var Scope = acl.Scope;
+var ACL = acl.ACL;
+var ScopeACL = acl.ScopeACL;
 var User = loopback.User;
 
 describe('security scopes', function () {
 
-  it("should allow access to models", function () {
+  it("should allow access to models for the given scope by wildcard", function () {
     var ds = loopback.createDataSource({connector: loopback.Memory});
-    acl.Scope.attachTo(ds);
+    Scope.attachTo(ds);
-    acl.ScopeResourceAccess.attachTo(ds);
+    ScopeACL.attachTo(ds);
 
-    // console.log(acl.Scope.relations);
+    // console.log(Scope.relations);
 
-    acl.Scope.create({name: 'user', description: 'access user information'}, function (err, scope) {
+    Scope.create({name: 'user', description: 'access user information'}, function (err, scope) {
-      console.log(scope);
+      // console.log(scope);
       scope.resources.create({model: 'user', property: '*', accessType: '*', permission: 'Allow'}, function (err, resource) {
-        console.log(resource);
+        // console.log(resource);
-        acl.Scope.isAllowed('user', 'user', '*', '*', console.log);
+        Scope.checkPermission('user', 'user', '*', '*', console.log);
+        Scope.checkPermission('user', 'user', 'name', '*', console.log);
+        Scope.checkPermission('user', 'user', 'name', 'Read', console.log);
       });
     });
 
   });
 
+  it("should allow access to models for the given scope", function () {
+    var ds = loopback.createDataSource({connector: loopback.Memory});
+    Scope.attachTo(ds);
+    ScopeACL.attachTo(ds);
+
+    // console.log(Scope.relations);
+
+    Scope.create({name: 'user', description: 'access user information'}, function (err, scope) {
+      // console.log(scope);
+      scope.resources.create({model: 'user', property: 'name', accessType: 'Read', permission: 'Allow'}, function (err, resource) {
+        // console.log(resource);
+        Scope.checkPermission('user', 'user', '*', '*', console.log);
+        Scope.checkPermission('user', 'user', 'name', '*', console.log);
+        Scope.checkPermission('user', 'user', 'name', 'Read', console.log);
+      });
+    });
+
+  });
+
+});
+
+describe('security ACLs', function () {
+
+  it("should allow access to models for the given principal by wildcard", function () {
+    var ds = loopback.createDataSource({connector: loopback.Memory});
+    ACL.attachTo(ds);
+
+    // console.log(Scope.relations);
+
+    ACL.create({principalType: 'user', principalId: 'u001', model: 'user', property: '*', accessType: '*', permission: 'Allow'}, function (err, acl) {
+
+      ACL.checkPermission('user', 'u001', 'user', 'u001', 'Read', console.log);
+
+    });
+
+  });
+
 });
 
 

test/model.test.js

@@ -512,6 +512,39 @@ describe('Model', function() {
     });
   });
 
+  describe('Model.extend() events', function() {
+    it('create isolated emitters for subclasses', function() {
+    var User1 = loopback.createModel('User1', {
+      'first': String,
+      'last': String
+    });
+
+    var User2 = loopback.createModel('User2', {
+      'name': String
+    });
+
+    var user1Triggered = false;
+    User1.once('x', function(event) {
+      user1Triggered = true;
+    });
+
+
+    var user2Triggered = false;
+    User2.once('x', function(event) {
+      user2Triggered = true;
+    });
+
+    assert(User1.once !== User2.once);
+    assert(User1.once !== loopback.Model.once);
+
+    User1.emit('x', User1);
+
+    assert(user1Triggered);
+    assert(!user2Triggered);
+    });
+
+  });
+
   // describe('Model.hasAndBelongsToMany()', function() {
   //   it("TODO: implement / document", function(done) {
   //     /* example - 

test/role.test.js

@@ -1,41 +1,60 @@
 var assert = require('assert');
 var loopback = require('../index');
-var Role = require('../lib/models/role');
+var role = require('../lib/models/role');
+var Role = role.Role;
+var RoleMapping = role.RoleMapping;
 var User = loopback.User;
 
 describe('security models', function () {
 
   describe('roles', function () {
 
-    it("Defines role/role relations", function () {
+    it("should define role/role relations", function () {
       var ds = loopback.createDataSource({connector: loopback.Memory});
       Role.attachTo(ds);
+      RoleMapping.attachTo(ds);
 
-      Role.create({name: 'user'}, function (err, role) {
+      Role.create({name: 'user'}, function (err, userRole) {
-        role.roles.create({name: 'admin'}, function (err, role2) {
+        Role.create({name: 'admin'}, function (err, adminRole) {
-          Role.find(console.log);
+          userRole.principals.create({principalType: 'role', principalId: adminRole.id}, function (err, mapping) {
-          role.roles(console.log);
+            Role.find(function(err, roles) {
+              assert.equal(roles.length, 2);
+            });
+            RoleMapping.find(function(err, mappings) {
+              assert.equal(mappings.length, 1);
+            });
+            userRole.principals(function(err, principals) {
+              assert.equal(principals.length, 1);
+            });
+            userRole.roles(function(err, roles) {
+              assert.equal(roles.length, 1);
+            });
+          });
         });
       });
 
     });
 
-    it("Defines role/user relations", function () {
+    it("should define role/user relations", function () {
       var ds = loopback.createDataSource({connector: loopback.Memory});
       User.attachTo(ds);
       Role.attachTo(ds);
 
-      Role.create({name: 'user'}, function (err, role) {
+      User.create({name: 'Raymond', email: 'x@y.com', password: 'foobar'}, function (err, user) {
-        role.users.create({name: 'Raymond'}, function (err, user) {
+        console.log('User: ', user.id);
-          console.log('User: ', user);
+        Role.create({name: 'userRole'}, function (err, role) {
+          role.principals.create({principalType: 'user', principalId: user.id}, function (err, p) {
             Role.find(console.log);
+            role.principals(console.log);
             role.users(console.log);
           });
         });
+      });
+
+    });
 
   });
 });
-});