477 lines
19 KiB
TypeScript
477 lines
19 KiB
TypeScript
// (C) Copyright 2015 Martin Dougiamas
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { Injectable, Injector } from '@angular/core';
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import { CoreDelegate, CoreDelegateHandler } from '@classes/delegate';
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import { CoreEventsProvider } from '@providers/events';
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import { CoreLoggerProvider } from '@providers/logger';
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import { CoreSitesProvider } from '@providers/sites';
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import { CoreUtilsProvider, PromiseDefer } from '@providers/utils/utils';
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import { CoreCoursesProvider } from '@core/courses/providers/courses';
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import { CoreCourseProvider } from './course';
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/**
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* Interface that all course options handlers must implement.
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*/
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export interface CoreCourseOptionsHandler extends CoreDelegateHandler {
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/**
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* The highest priority is displayed first.
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* @type {number}
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*/
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priority: number;
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/**
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* Whether or not the handler is enabled for a certain course.
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*
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* @param {number} courseId The course ID.
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* @param {any} accessData Access type and data. Default, guest, ...
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {boolean|Promise<boolean>} True or promise resolved with true if enabled.
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*/
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isEnabledForCourse(courseId: number, accessData: any, navOptions?: any, admOptions?: any): boolean | Promise<boolean>;
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/**
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* Returns the data needed to render the handler.
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*
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* @param {Injector} injector Injector.
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* @param {number} courseId The course ID.
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* @return {CoreCourseOptionsHandlerData|Promise<CoreCourseOptionsHandlerData>} Data or promise resolved with the data.
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*/
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getDisplayData?(injector: Injector, courseId: number): CoreCourseOptionsHandlerData | Promise<CoreCourseOptionsHandlerData>;
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/**
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* Should invalidate the data to determine if the handler is enabled for a certain course.
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*
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* @param {number} courseId The course ID.
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<any>} Promise resolved when done.
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*/
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invalidateEnabledForCourse?(courseId: number, navOptions?: any, admOptions?: any): Promise<any>;
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/**
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* Called when a course is downloaded. It should prefetch all the data to be able to see the addon in offline.
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*
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* @param {any} course The course.
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* @return {Promise<any>} Promise resolved when done.
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*/
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prefetch?(course: any): Promise<any>;
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}
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/**
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* Data needed to render a course handler. It's returned by the handler.
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*/
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export interface CoreCourseOptionsHandlerData {
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/**
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* Title to display for the handler.
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* @type {string}
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*/
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title: string;
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/**
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* Class to add to the displayed handler.
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* @type {string}
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*/
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class?: string;
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/**
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* The component to render the handler. It must be the component class, not the name or an instance.
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* When the component is created, it will receive the courseId as input.
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*/
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component: any;
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/**
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* Data to pass to the component. All the properties in this object will be passed to the component as inputs.
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* @type {any}
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*/
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componentData?: any;
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}
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/**
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* Data returned by the delegate for each handler.
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*/
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export interface CoreCourseOptionsHandlerToDisplay {
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/**
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* Data to display.
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* @type {CoreCourseOptionsHandlerData}
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*/
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data: CoreCourseOptionsHandlerData;
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/**
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* The highest priority is displayed first.
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* @type {number}
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*/
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priority?: number;
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/**
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* Called when a course is downloaded. It should prefetch all the data to be able to see the addon in offline.
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*
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* @param {any} course The course.
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* @return {Promise<any>} Promise resolved when done.
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*/
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prefetch?(course: any): Promise<any>;
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}
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/**
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* Service to interact with plugins to be shown in each course (participants, learning plans, ...).
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*/
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@Injectable()
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export class CoreCourseOptionsDelegate extends CoreDelegate {
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protected loaded: { [courseId: number]: boolean } = {};
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protected lastUpdateHandlersForCoursesStart: any = {};
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protected coursesHandlers: {
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[courseId: number]: {
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access?: any, navOptions?: any, admOptions?: any, deferred?: PromiseDefer, enabledHandlers?: CoreCourseOptionsHandler[]
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}
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} = {};
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protected featurePrefix = 'CoreCourseOptionsDelegate_';
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constructor(loggerProvider: CoreLoggerProvider, protected sitesProvider: CoreSitesProvider, private utils: CoreUtilsProvider,
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protected eventsProvider: CoreEventsProvider, private coursesProvider: CoreCoursesProvider) {
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super('CoreCourseOptionsDelegate', loggerProvider, sitesProvider, eventsProvider);
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eventsProvider.on(CoreEventsProvider.LOGOUT, () => {
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this.clearCoursesHandlers();
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});
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}
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/**
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* Check if handlers are loaded for a certain course.
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*
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* @param {number} courseId The course ID to check.
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* @return {boolean} True if handlers are loaded, false otherwise.
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*/
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areHandlersLoaded(courseId: number): boolean {
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return !!this.loaded[courseId];
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}
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/**
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* Clear all course options handlers.
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*
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* @param {number} [courseId] The course ID. If not defined, all handlers will be cleared.
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*/
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protected clearCoursesHandlers(courseId?: number): void {
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if (courseId) {
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this.loaded[courseId] = false;
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delete this.coursesHandlers[courseId];
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} else {
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this.loaded = {};
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this.coursesHandlers = {};
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}
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}
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/**
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* Clear all courses handlers and invalidate its options.
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*
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* @param {number} [courseId] The course ID. If not defined, all handlers will be cleared.
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* @return {Promise<any>} Promise resolved when done.
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*/
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clearAndInvalidateCoursesOptions(courseId?: number): Promise<any> {
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const promises = [];
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this.eventsProvider.trigger(CoreCoursesProvider.EVENT_MY_COURSES_REFRESHED);
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// Invalidate course enabled data for the handlers that are enabled at site level.
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if (courseId) {
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// Invalidate only options for this course.
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promises.push(this.coursesProvider.invalidateCoursesAdminAndNavOptions([courseId]));
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promises.push(this.invalidateCourseHandlers(courseId));
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} else {
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// Invalidate all options.
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promises.push(this.coursesProvider.invalidateUserNavigationOptions());
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promises.push(this.coursesProvider.invalidateUserAdministrationOptions());
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for (const cId in this.coursesHandlers) {
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promises.push(this.invalidateCourseHandlers(parseInt(cId, 10)));
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}
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}
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this.clearCoursesHandlers(courseId);
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return Promise.all(promises);
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}
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/**
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* Get the handlers for a course using a certain access type.
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*
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* @param {number} courseId The course ID.
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* @param {boolean} refresh True if it should refresh the list.
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* @param {any} accessData Access type and data. Default, guest, ...
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<CoreCourseOptionsHandler[]>} Promise resolved with array of handlers.
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*/
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protected getHandlersForAccess(courseId: number, refresh: boolean, accessData: any, navOptions?: any,
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admOptions?: any): Promise<CoreCourseOptionsHandler[]> {
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// If the handlers aren't loaded, do not refresh.
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if (!this.loaded[courseId]) {
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refresh = false;
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}
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if (refresh || !this.coursesHandlers[courseId] || this.coursesHandlers[courseId].access.type != accessData.type) {
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if (!this.coursesHandlers[courseId]) {
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this.coursesHandlers[courseId] = {};
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}
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this.coursesHandlers[courseId].access = accessData;
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this.coursesHandlers[courseId].navOptions = navOptions;
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this.coursesHandlers[courseId].admOptions = admOptions;
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this.coursesHandlers[courseId].deferred = this.utils.promiseDefer();
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this.updateHandlersForCourse(courseId, accessData, navOptions, admOptions);
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}
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return this.coursesHandlers[courseId].deferred.promise.then(() => {
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return this.coursesHandlers[courseId].enabledHandlers;
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});
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}
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/**
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* Get the list of handlers that should be displayed for a course.
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* This function should be called only when the handlers need to be displayed, since it can call several WebServices.
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*
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* @param {Injector} injector Injector.
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* @param {any} course The course object.
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* @param {boolean} [refresh] True if it should refresh the list.
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* @param {boolean} [isGuest] Whether it's guest.
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<CoreCourseOptionsHandlerToDisplay[]>} Promise resolved with array of handlers.
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*/
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getHandlersToDisplay(injector: Injector, course: any, refresh?: boolean, isGuest?: boolean, navOptions?: any, admOptions?: any):
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Promise<CoreCourseOptionsHandlerToDisplay[]> {
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course.id = parseInt(course.id, 10);
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const accessData = {
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type: isGuest ? CoreCourseProvider.ACCESS_GUEST : CoreCourseProvider.ACCESS_DEFAULT
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};
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if (navOptions) {
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course.navOptions = navOptions;
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}
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if (admOptions) {
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course.admOptions = admOptions;
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}
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return this.loadCourseOptions(course, refresh).then(() => {
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// Call getHandlersForAccess to make sure the handlers have been loaded.
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return this.getHandlersForAccess(course.id, refresh, accessData, course.navOptions, course.admOptions);
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}).then(() => {
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const handlersToDisplay: CoreCourseOptionsHandlerToDisplay[] = [],
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promises = [];
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this.coursesHandlers[course.id].enabledHandlers.forEach((handler) => {
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promises.push(Promise.resolve(handler.getDisplayData(injector, course)).then((data) => {
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handlersToDisplay.push({
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data: data,
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priority: handler.priority,
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prefetch: handler.prefetch
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});
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}).catch((err) => {
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this.logger.error('Error getting data for handler', handler.name, err);
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}));
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});
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// Sort them by priority.
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handlersToDisplay.sort((a, b) => {
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return b.priority - a.priority;
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});
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return handlersToDisplay;
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});
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}
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/**
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* Check if a course has any handler enabled for default access, using course object.
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*
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* @param {any} course The course object.
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* @param {boolean} [refresh] True if it should refresh the list.
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* @return {Promise<boolean>} Promise resolved with boolean: true if it has handlers, false otherwise.
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*/
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hasHandlersForCourse(course: any, refresh?: boolean): Promise<boolean> {
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// Load course options if missing.
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return this.loadCourseOptions(course, refresh).then(() => {
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return this.hasHandlersForDefault(course.id, refresh, course.navOptions, course.admOptions);
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});
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}
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/**
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* Check if a course has any handler enabled for default access.
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*
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* @param {number} courseId The course ID.
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* @param {boolean} [refresh] True if it should refresh the list.
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<boolean>} Promise resolved with boolean: true if it has handlers, false otherwise.
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*/
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hasHandlersForDefault(courseId: number, refresh?: boolean, navOptions?: any, admOptions?: any): Promise<boolean> {
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// Default access.
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const accessData = {
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type: CoreCourseProvider.ACCESS_DEFAULT
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};
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return this.getHandlersForAccess(courseId, refresh, accessData, navOptions, admOptions).then((handlers) => {
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return !!(handlers && handlers.length);
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});
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}
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/**
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* Check if a course has any handler enabled for guest access.
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*
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* @param {number} courseId The course ID.
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* @param {boolean} [refresh] True if it should refresh the list.
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<boolean>} Promise resolved with boolean: true if it has handlers, false otherwise.
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*/
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hasHandlersForGuest(courseId: number, refresh?: boolean, navOptions?: any, admOptions?: any): Promise<boolean> {
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// Guest access.
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const accessData = {
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type: CoreCourseProvider.ACCESS_GUEST
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};
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return this.getHandlersForAccess(courseId, refresh, accessData, navOptions, admOptions).then((handlers) => {
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return !!(handlers && handlers.length);
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});
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}
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/**
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* Invalidate the data to be able to determine if handlers are enabled for a certain course.
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*
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* @param {number} courseId Course ID.
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* @return {Promise<any>} Promise resolved when done.
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*/
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invalidateCourseHandlers(courseId: number): Promise<any> {
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const promises = [],
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courseData = this.coursesHandlers[courseId];
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if (!courseData) {
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return Promise.resolve();
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}
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courseData.enabledHandlers.forEach((handler) => {
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if (handler && handler.invalidateEnabledForCourse) {
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promises.push(Promise.resolve(
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handler.invalidateEnabledForCourse(courseId, courseData.navOptions, courseData.admOptions)));
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}
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});
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return this.utils.allPromises(promises);
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}
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/**
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* Check if a time belongs to the last update handlers for course call.
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* This is to handle the cases where updateHandlersForCourse don't finish in the same order as they're called.
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*
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* @param {number} courseId Course ID.
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* @param {number} time Time to check.
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* @return {boolean} Whether it's the last call.
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*/
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isLastUpdateCourseCall(courseId: number, time: number): boolean {
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if (!this.lastUpdateHandlersForCoursesStart[courseId]) {
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return true;
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}
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return time == this.lastUpdateHandlersForCoursesStart[courseId];
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}
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/**
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* Load course options if missing.
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*
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* @param {any} course The course object.
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* @param {boolean} [refresh] True if it should refresh the list.
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* @return {Promise<void>} Promise resolved when done.
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*/
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protected loadCourseOptions(course: any, refresh?: boolean): Promise<void> {
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if (this.coursesProvider.canGetAdminAndNavOptions() &&
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(typeof course.navOptions == 'undefined' || typeof course.admOptions == 'undefined' || refresh)) {
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return this.coursesProvider.getCoursesAdminAndNavOptions([course.id]).then((options) => {
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course.navOptions = options.navOptions[course.id];
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course.admOptions = options.admOptions[course.id];
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});
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} else {
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return Promise.resolve();
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}
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}
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/**
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* Update handlers for each course.
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*
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* @param {string} [siteId] Site ID.
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*/
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updateData(siteId?: string): void {
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if (this.sitesProvider.getCurrentSiteId() === siteId) {
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// Update handlers for all courses.
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for (const courseId in this.coursesHandlers) {
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const handler = this.coursesHandlers[courseId];
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this.updateHandlersForCourse(parseInt(courseId, 10), handler.access, handler.navOptions, handler.admOptions);
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}
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}
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}
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/**
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* Update the handlers for a certain course.
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*
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* @param {number} courseId The course ID.
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* @param {any} accessData Access type and data. Default, guest, ...
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* @param {any} [navOptions] Course navigation options for current user. See CoreCoursesProvider.getUserNavigationOptions.
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* @param {any} [admOptions] Course admin options for current user. See CoreCoursesProvider.getUserAdministrationOptions.
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* @return {Promise<any>} Resolved when updated.
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*/
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updateHandlersForCourse(courseId: number, accessData: any, navOptions?: any, admOptions?: any): Promise<any> {
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const promises = [],
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enabledForCourse = [],
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siteId = this.sitesProvider.getCurrentSiteId(),
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now = Date.now();
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this.lastUpdateHandlersForCoursesStart[courseId] = now;
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for (const name in this.enabledHandlers) {
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const handler = <CoreCourseOptionsHandler> this.enabledHandlers[name];
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// Checks if the handler is enabled for the user.
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promises.push(Promise.resolve(handler.isEnabledForCourse(courseId, accessData, navOptions, admOptions))
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.then((enabled) => {
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if (enabled) {
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enabledForCourse.push(handler);
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} else {
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return Promise.reject(null);
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}
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}).catch(() => {
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// Nothing to do here, it is not enabled for this user.
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}));
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}
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return Promise.all(promises).then(() => {
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return true;
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}).catch(() => {
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// Never fails.
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return true;
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}).finally(() => {
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// Verify that this call is the last one that was started.
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// Check that site hasn't changed since the check started.
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if (this.isLastUpdateCourseCall(courseId, now) && this.sitesProvider.getCurrentSiteId() === siteId) {
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// Update the coursesHandlers array with the new enabled addons.
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this.coursesHandlers[courseId].enabledHandlers = enabledForCourse;
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this.loaded[courseId] = true;
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// Resolve the promise.
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this.coursesHandlers[courseId].deferred.resolve();
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}
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});
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}
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}
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