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access-strategy.js
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access-strategy.js
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var Sealious = require("../main.js");
var Promise = require("bluebird");
var Chip = require("./chip.js");
function AccessStrategy (declaration) {
if (typeof declaration.name != "string") {
throw new Sealious.Errors.DeveloperError("Access strategy declaration has an invalid or missing `name` attribute");
}
Chip.call(this, true, "access_strategy", declaration.name);
this.checker_function = null;
this.item_sensitive = false;
if (declaration) this._process_declaration(declaration);
}
AccessStrategy.prototype = new function(){
/*
Process declaration of access strategy. Gives new access strategy checker_function and item_sensitive from declaration.
@param {object} delcaration - is an object with attributes:
name - string, required. The name of the access strategy - it has to be a string unique amongst any other access strategies in your application.
checker_function - function, required. It’s a function that takes a context instance as an argument and implements the logic of the access strategy. Its return values can be:
* boolean - true for granting the access and false for denying.
* a Promise - that resolves when the access is granted and rejects otherwise. Use promises only when the decision depends on a result of an asynchronous function.
item_sensitive - boolean, defaults to false. If set to true, the checker_function is provided with a second argument, which contains an object representing the resource being requested.
*/
this._process_declaration = function(declaration){
this.checker_function = declaration.checker_function === undefined ? null : declaration.checker_function;
if (declaration.item_sensitive !== undefined) {
this.item_sensitive = declaration.item_sensitive;
}
}
/*
Setter of checker function.
@param {function} checker_function - function to be set as checker function of this access strategy.
return void
*/
this.set_checker_function = function(checker_function){
this.checker_function = checker_function;
}
/*
Calls checker function and returns Promise if checker function resolves or error if it doesn't.
@param {object} context - context in which item will be checked
@param {object} item - item to be checked by checker function
return Promise
*/
this.check = function(context, item){
var arguments_to_check_function = arguments;
return this.checker_function.apply(this, arguments_to_check_function)
.then(function(){
return Promise.resolve(item);
}).catch(function(error_message){
if (typeof error_message == "string") {
return Promise.reject(new Sealious.Errors.BadContext(error_message));
} else {
return Promise.reject(error_message);
}
});
}
}
// odrzucanie i przyjmowanie wartości za pomocą checker_function, która zwraca Promisa
// odrzucanie i przyjmowanie wartości za pomocą checker_function, która zwraca Booleana
AccessStrategy.type_name = "access_strategy";
AccessStrategy.test_start = function(){
describe("AccessStrategy", function(){
describe(".check", function(){
describe("with checker_function that returns a Promise", function(){
})
})
});
}
module.exports = AccessStrategy;

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