Proyectos de Subversion Moodle

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * TinyMCE Editor Manager.

 *

 * @module editor_tiny/editor

 * @copyright  2022 Andrew Lyons <andrew@nicols.co.uk>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

import jQuery from 'jquery';

import Pending from 'core/pending';

import {getDefaultConfiguration, getDefaultQuickbarsSelectionToolbar} from './defaults';

import {getTinyMCE, baseUrl} from './loader';

import * as Options from './options';

import {addToolbarButton, addToolbarButtons, addToolbarSection,

    removeToolbarButton, removeSubmenuItem, updateEditorState} from './utils';

import {addMathMLSupport, addSVGSupport} from './content';

import Config from 'core/config';

/**

 * Storage for the TinyMCE instances on the page.

 * @type {Map}

 */

const instanceMap = new Map();

/**

 * The default editor configuration.

 * @type {Object}

 */

let defaultOptions = {};

/**

 * Require the modules for the named set of TinyMCE plugins.

 *

 * @param {string[]} pluginList The list of plugins

 * @return {Promise[]} A matching set of Promises relating to the requested plugins

 */

const importPluginList = async(pluginList) => {

    // Fetch all of the plugins from the list of plugins.

    // If a plugin contains a '/' then it is assumed to be a Moodle AMD module to import.

    const pluginHandlers = await Promise.all(pluginList.map(pluginPath => {

        if (pluginPath.indexOf('/') === -1) {

            // A standard TinyMCE Plugin.

            return Promise.resolve(pluginPath);

        }

        return import(pluginPath);

    }));

    // Normalise the plugin data to a list of plugin names.

    // Two formats are supported:

    // - a string; and

    // - an array whose first element is the plugin name, and the second element is the plugin configuration.

    const pluginNames = pluginHandlers.map((pluginConfig) => {

        if (typeof pluginConfig === 'string') {

            return pluginConfig;

        }

        if (Array.isArray(pluginConfig)) {

            return pluginConfig[0];

        }

        return null;

    }).filter((value) => value);

    // Fetch the list of pluginConfig handlers.

    const pluginConfig = pluginHandlers.map((pluginConfig) => {

        if (Array.isArray(pluginConfig)) {

            return pluginConfig[1];

        }

        return null;

    }).filter((value) => value);

    return {

        pluginNames,

        pluginConfig,

    };

};

/**

 * Fetch the language data for the specified language.

 *

 * @param {string} language The language identifier

 * @returns {object}

 */

const fetchLanguage = (language) => fetch(

    `${M.cfg.wwwroot}/lib/editor/tiny/lang.php/${M.cfg.langrev}/${language}`

).then(response => response.json());

/**

 * Get a list of all Editors in a Map, keyed by the DOM Node that the Editor is associated with.

 *

 * @returns {Map<Node, Editor>}

 */

export const getAllInstances = () => new Map(instanceMap.entries());

/**

 * Get the TinyMCE instance for the specified Node ID.

 *

 * @param {string} elementId

 * @returns {TinyMCE|undefined}

 */

export const getInstanceForElementId = elementId => getInstanceForElement(document.getElementById(elementId));

/*

 * Get the TinyMCE instance for the specified HTMLElement.

 *

 * @param {HTMLElement} element

 * @returns {TinyMCE|undefined}

 */

export const getInstanceForElement = element => {

    const instance = instanceMap.get(element);

    if (instance && instance.removed) {

        instanceMap.delete(element);

        return undefined;

    }

    return instance;

};

/**

 * Set up TinyMCE for the selector at the specified HTML Node id.

 *

 * @param {object} config The configuration required to setup the editor

 * @param {string} config.elementId The HTML Node ID

 * @param {Object} config.options The editor plugin configuration

 */

export const setupForElementId = ({elementId, options}) => {

    const target = document.getElementById(elementId);

    // We will need to wrap the setupForTarget and editor.remove() calls in a setTimeout.

    // Because other events callbacks will still try to run on the removed instance.

    // This will cause an error on Firefox.

    // We need to make TinyMCE to remove itself outside the event loop.

    // @see https://github.com/tinymce/tinymce/issues/3129 for more details.

    setTimeout(() => {

        return setupForTarget(target, options);

    }, 1);

};

/**

 * Initialise the page with standard TinyMCE requirements.

 *

 * Currently this includes the language taken from the HTML lang property.

 */

const initialisePage = async() => {

    const lang = document.querySelector('html').lang;

    const [tinyMCE, langData] = await Promise.all([getTinyMCE(), fetchLanguage(Config.language)]);

    tinyMCE.addI18n(lang, langData);

};

initialisePage();

/**

 * Get the list of plugins to load for the specified configuration.

 *

 * If the specified configuration does not include a plugin configuration, then return the default configuration.

 *

 * @param {object} options

 * @param {array} [options.plugins=null] The plugin list

 * @returns {object}

 */

const getPlugins = ({plugins = null} = {}) => {

    if (plugins) {

        return plugins;

    }

    if (defaultOptions.plugins) {

        return defaultOptions.plugins;

    }

    return {};

};

/**

 * Adjust the editor size base on the target element.

 *

 * @param {TinyMCE} editor TinyMCE editor

 * @param {Node} target Target element

 */

const adjustEditorSize = (editor, target) => {

    let expectedEditingAreaHeight = 0;

    if (target.clientHeight) {

        expectedEditingAreaHeight = target.clientHeight;

    } else {

        // If the target element is hidden, we cannot get the lineHeight of the target element.

        // We don't have a proper way to retrieve the general lineHeight of the theme, so we use 22 here, it's equivalent to 1.5em.

        expectedEditingAreaHeight = target.rows * (parseFloat(window.getComputedStyle(target).lineHeight) || 22);

    }

    const currentEditingAreaHeight = editor.getContainer().querySelector('.tox-sidebar-wrap').clientHeight;

    if (currentEditingAreaHeight < expectedEditingAreaHeight) {

        // Change the height based on the target element's height.

        editor.getContainer().querySelector('.tox-sidebar-wrap').style.height = `${expectedEditingAreaHeight}px`;

    }

};

/**

 * Get the standard configuration for the specified options.

 *

 * @param {Node} target

 * @param {tinyMCE} tinyMCE

 * @param {object} options

 * @param {Array} plugins

 * @returns {object}

 */

const getStandardConfig = (target, tinyMCE, options, plugins) => {

    const lang = document.querySelector('html').lang;

    const config = Object.assign({}, getDefaultConfiguration(), {

        // eslint-disable-next-line camelcase

        base_url: baseUrl,

        // Set the editor target.

        // https://www.tiny.cloud/docs/tinymce/6/editor-important-options/#target

        target,

        // https://www.tiny.cloud/docs/tinymce/6/customize-ui/#set-maximum-and-minimum-heights-and-widths

        // Set the minimum height to the smallest height that we can fit the Menu bar, Tool bar, Status bar and the text area.

        // eslint-disable-next-line camelcase

        min_height: 175,

        // Base the height on the size of the text area.

        // In some cases, E.g.: The target is an advanced element, it will be hidden. We cannot get the height at this time.

        // So set the height to auto, and adjust it later by adjustEditorSize().

        height: target.clientHeight || 'auto',

        // Set the language.

        // https://www.tiny.cloud/docs/tinymce/6/ui-localization/#language

        // eslint-disable-next-line camelcase

        language: lang,

        // Disable default iframe sandboxing.

        // https://www.tiny.cloud/docs/tinymce/latest/content-filtering/#sandbox-iframes

        // eslint-disable-next-line camelcase

        sandbox_iframes: false,

        // Load the editor stylesheet into the editor iframe.

        // https://www.tiny.cloud/docs/tinymce/6/add-css-options/

        // eslint-disable-next-line camelcase

        content_css: [

            options.css,

        ],

        // Do not convert URLs to relative URLs.

        // https://www.tiny.cloud/docs/tinymce/6/url-handling/#convert_urls

        // eslint-disable-next-line camelcase

        convert_urls: false,

        // Enabled 'advanced' a11y options.

        // This includes allowing role="presentation" from the image uploader.

        // https://www.tiny.cloud/docs/tinymce/6/accessibility/

        // eslint-disable-next-line camelcase

        a11y_advanced_options: true,

        // Add specific rules to the valid elements.

        // eslint-disable-next-line camelcase

        extended_valid_elements: options.extended_valid_elements,

        // Disable XSS Sanitisation.

        // We do this in PHP.

        // https://www.tiny.cloud/docs/tinymce/6/security/#turning-dompurify-off

        // Note: This feature has been backported from TinyMCE 6.4.0.

        // eslint-disable-next-line camelcase

        xss_sanitization: false,

        // Disable quickbars entirely.

        // The UI is not ideal and we'll wait for it to improve in future before we enable it in Moodle.

        // eslint-disable-next-line camelcase

        quickbars_insert_toolbar: '',

        // If the target element is too small, disable the quickbars selection toolbar.

        // The quickbars selection toolbar is not displayed correctly if the target element is too small.

        // See: https://github.com/tinymce/tinymce/issues/9693.

        quickbars_selection_toolbar: target.rows > 5 ? getDefaultQuickbarsSelectionToolbar() : false,

        // Override the standard block formats property (removing h1 & h2).

        // https://www.tiny.cloud/docs/tinymce/6/user-formatting-options/#block_formats

        // eslint-disable-next-line camelcase

        block_formats: 'Paragraph=p;Heading 3=h3;Heading 4=h4;Heading 5=h5;Heading 6=h6;Preformatted=pre;Blockquote=blockquote',

        // The list of plugins to include in the instance.

        // https://www.tiny.cloud/docs/tinymce/6/editor-important-options/#plugins

        plugins: [

            ...plugins,

        ],

        // Skins

        skin: 'oxide',

        // Do not show the help link in the status bar.

        // https://www.tiny.cloud/docs/tinymce/latest/accessibility/#help_accessibility

        // eslint-disable-next-line camelcase

        help_accessibility: false,

        // Remove the "Upgrade" link for Tiny.

        // https://www.tiny.cloud/docs/tinymce/6/editor-premium-upgrade-promotion/

        promotion: false,

        // Allow the administrator to disable branding.

        // https://www.tiny.cloud/docs/tinymce/6/statusbar-configuration-options/#branding

        branding: options.branding,

        // Put th cells in a thead element.

        // https://www.tiny.cloud/docs/tinymce/6/table-options/#table_header_type

        // eslint-disable-next-line camelcase

        table_header_type: 'sectionCells',

        // Stored text in non-entity form.

        // https://www.tiny.cloud/docs/tinymce/6/content-filtering/#entity_encoding

        // eslint-disable-next-line camelcase

        entity_encoding: "raw",

        // Enable support for editors in scrollable containers.

        // https://www.tiny.cloud/docs/tinymce/6/ui-mode-configuration-options/#ui_mode

        // eslint-disable-next-line camelcase

        ui_mode: 'split',

        // Enable browser-supported spell checking.

        // https://www.tiny.cloud/docs/tinymce/latest/spelling/

        // eslint-disable-next-line camelcase

        browser_spellcheck: true,

        // Set the license_key to gpl.

        // https://www.tiny.cloud/docs/tinymce/latest/license-key/

        // eslint-disable-next-line camelcase

        license_key: 'gpl',

        // Disable the Alt+F12 shortcut.

        // This was introduced in Tiny 7.1 to focus notifications, but it conflicts with the German keyboard layout

        // which uses Alt+F12 to access the open curly brace.

        // This is an upstream problem with TinyMCE and should be fixed in a future release.

        // The recommended workaround is to disable the shortcut.

        // See MDL-83257 for further information.

        // eslint-disable-next-line camelcase

        init_instance_callback: (editor) => {

            editor.shortcuts.remove('alt+f12');

        },

        setup: (editor) => {

            Options.register(editor, options);

            editor.on('PreInit', function() {

                // Work around a bug in TinyMCE with Firefox.

                // When an editor is removed, and replaced with an identically attributed editor (same ID),

                // and the Firefox window is freshly opened (e.g. Behat, Private browsing), the wrong contentWindow

                // is assigned to the editor instance leading to an NS_ERROR_UNEXPECTED error in Firefox.

                // This is a workaround for that issue.

                this.contentWindow = this.iframeElement.contentWindow;

            });

            editor.on('init', function() {

                // Hide justify alignment sub-menu.

                removeSubmenuItem(editor, 'align', 'tiny:justify');

                // Adjust the editor size.

                adjustEditorSize(editor, target);

            });

            addMathMLSupport(editor);

            addSVGSupport(editor);

            target.addEventListener('form:editorUpdated', function() {

                updateEditorState(editor, target);

            });

            target.dispatchEvent(new Event('form:editorUpdated'));

        },

    });

    config.toolbar = addToolbarSection(config.toolbar, 'content', 'formatting', true);

    config.toolbar = addToolbarButton(config.toolbar, 'content', 'link');

    // Add directionality plugins, always.

    config.toolbar = addToolbarSection(config.toolbar, 'directionality', 'alignment', true);

    config.toolbar = addToolbarButtons(config.toolbar, 'directionality', ['ltr', 'rtl']);

    // Remove the align justify button from the toolbar.

    config.toolbar = removeToolbarButton(config.toolbar, 'alignment', 'alignjustify');

    return config;

};

/**

 * Fetch the TinyMCE configuration for this editor instance.

 *

 * @param {HTMLElement} target

 * @param {TinyMCE} tinyMCE The TinyMCE API

 * @param {Object} options The editor plugin configuration

 * @param {object} pluginValues

 * @param {object} pluginValues.pluginConfig The list of plugin configuration

 * @param {object} pluginValues.pluginNames The list of plugins to load

 * @returns {object} The TinyMCE Configuration

 */

const getEditorConfiguration = (target, tinyMCE, options, pluginValues) => {

    const {

        pluginNames,

        pluginConfig,

    } = pluginValues;

    // Allow plugins to modify the configuration.

    // This seems a little strange, but we must double-process the config slightly.

    // First we fetch the standard configuration.

    const instanceConfig = getStandardConfig(target, tinyMCE, options, pluginNames);

    // Next we make any standard changes.

    // Here we remove the file menu, as it doesn't offer any useful functionality.

    // We only empty the items list so that a plugin may choose to add to it themselves later if they wish.

    if (instanceConfig.menu.file) {

        instanceConfig.menu.file.items = '';

    }

    // We disable the styles, backcolor, and forecolor plugins from the format menu.

    // These are not useful for Moodle and we don't want to encourage their use.

    if (instanceConfig.menu.format) {

        instanceConfig.menu.format.items = instanceConfig.menu.format.items

            // Remove forecolor and backcolor.

            .replace(/forecolor ?/, '')

            .replace(/backcolor ?/, '')

            // Remove fontfamily for now.

            .replace(/fontfamily ?/, '')

            // Remove fontsize for now.

            .replace(/fontsize ?/, '')

            // Remove styles - it just duplicates the format menu in a way which does not respect configuration

            .replace(/styles ?/, '')

            // Remove any duplicate separators.

            .replaceAll(/\| *\|/g, '|');

    }

    if (instanceConfig.quickbars_selection_toolbar !== false) {

        // eslint-disable-next-line camelcase

        instanceConfig.quickbars_selection_toolbar = instanceConfig.quickbars_selection_toolbar.replace('h2 h3', 'h3 h4 h5 h6');

    }

    // Next we call the `configure` function for any plugin which defines it.

    // We pass the current instanceConfig in here, to allow them to make certain changes to the global configuration.

    // For example, to add themselves to any menu, toolbar, and so on.

    // Any plugin which wishes to have configuration options must register those options here.

    pluginConfig.filter((pluginConfig) => typeof pluginConfig.configure === 'function').forEach((pluginConfig) => {

        const pluginInstanceOverride = pluginConfig.configure(instanceConfig, options);

        Object.assign(instanceConfig, pluginInstanceOverride);

    });

    // Next we convert the plugin configuration into a format that TinyMCE understands.

    Object.assign(instanceConfig, Options.getInitialPluginConfiguration(options));

    return instanceConfig;

};

/**

 * Check if the target for TinyMCE is in a modal or not.

 *

 * @param {HTMLElement} target Target to check

 * @returns {boolean} True if the target is in a modal form.

 */

const isModalMode = (target) => {

    return !!target.closest('[data-region="modal"]');

};

/**

 * Set up TinyMCE for the HTML Element.

 *

 * @param {HTMLElement} target

 * @param {Object} [options={}] The editor plugin configuration

 * @return {Promise<TinyMCE>} The TinyMCE instance

 */

export const setupForTarget = async(target, options = {}) => {

    const instance = getInstanceForElement(target);

    if (instance) {

        return Promise.resolve(instance);

    }

    // Register a new pending promise to ensure that Behat waits for the editor setup to complete before continuing.

    const pendingPromise = new Pending('editor_tiny/editor:setupForTarget');

    // Get the list of plugins.

    const plugins = getPlugins(options);

    // Fetch the tinyMCE API, and instantiate the plugins.

    const [tinyMCE, pluginValues] = await Promise.all([

        getTinyMCE(),

        importPluginList(Object.keys(plugins)),

    ]);

    // TinyMCE uses the element ID as a map key internally, even if the target has changed.

    // In the case where we have an editor in a modal form which has been detached from the DOM, but the editor not removed,

    // we need to manually destroy the editor.

    // We could theoretically do this with a Mutation Observer, but in some cases the Node may be moved,

    // or added back elsewhere in the DOM.

    // First remove any detached editors.

    tinyMCE.get().filter((editor) => !editor.getElement().isConnected).forEach((editor) => {

        editor.remove();

    });

    // Now check for any existing editor which shares the same ID.

    const existingEditor = tinyMCE.EditorManager.get(target.id);

    if (existingEditor) {

        if (existingEditor.getElement() === target) {

            pendingPromise.resolve();

            return Promise.resolve(existingEditor);

        } else {

            pendingPromise.resolve();

            throw new Error('TinyMCE instance already exists for different target with same ID');

        }

    }

    // Get the editor configuration for this editor.

    const instanceConfig = getEditorConfiguration(target, tinyMCE, options, pluginValues);

    // Initialise the editor instance for the given configuration.

    // At this point any plugin which has configuration options registered will have them applied for this instance.

    const [editor] = await tinyMCE.init(instanceConfig);

    // Update the textarea when the editor to set the field type for Behat.

    target.dataset.fieldtype = 'editor';

    // Store the editor instance in the instanceMap and register a listener on removal to remove it from the map.

    instanceMap.set(target, editor);

    editor.on('remove', ({target}) => {

        // Handle removal of the editor from the map on destruction.

        instanceMap.delete(target.targetElm);

        target.targetElm.dataset.fieldtype = null;

    });

    // If the editor is part of a form, also listen to the jQuery submit event.

    // The jQuery submit event will not trigger the native submit event, and therefore the content will not be saved.

    // We cannot rely on listening to the bubbled submit event on the document because other events on child nodes may

    // consume the data before it is saved.

    if (target.form) {

        jQuery(target.form).on('submit', () => {

            editor.save();

        });

    }

    // Save the editor content to the textarea when the editor is blurred.

    editor.on('blur', () => {

        editor.save();

    });

    // If the editor is in a modal, we need to hide the modal when window editor's window is opened.

    editor.on('OpenWindow', () => {

        const modals = document.querySelectorAll('[data-region="modal"]');

        if (modals) {

            modals.forEach((modal) => {

                if (!modal.classList.contains('hide')) {

                    modal.classList.add('hide');

                }

            });

        }

    });

    // If the editor's window is closed, we need to show the hidden modal back.

    editor.on('CloseWindow', () => {

        if (isModalMode(target)) {

            const modals = document.querySelectorAll('[data-region="modal"]');

            if (modals) {

                modals.forEach((modal) => {

                    if (modal.classList.contains('hide')) {

                        modal.classList.remove('hide');

                    }

                });

            }

        }

    });

    pendingPromise.resolve();

    return editor;

};

/**

 * Set the default editor configuration.

 *

 * This configuration is used when an editor is initialised without any configuration.

 *

 * @param {object} [options={}]

 */

export const configureDefaultEditor = (options = {}) => {

    defaultOptions = options;

};