MOBILE-4309 format-text: Treat font awesome tags to be rendered

src/core/directives/fa-icon.ts

@@ -14,12 +14,10 @@
 
 import { AfterViewInit, Directive, ElementRef, Input, OnChanges, SimpleChange } from '@angular/core';
 import { CoreLogger } from '@singletons/logger';
-import { Http } from '@singletons';
+import { CoreIcons } from '@singletons/icons';
-import { CoreConstants } from '@/core/constants';
-import { CorePromisedValue } from '@classes/promised-value';
 
 /**
- * Directive to enable font-awesome 6.3 as ionicons.
+ * Directive to enable font-awesome 6.4 as ionicons.
  * Check available icons at https://fontawesome.com/search?o=r&m=free
  *
  * Example usage:
@@ -31,13 +29,6 @@ import { CorePromisedValue } from '@classes/promised-value';
 })
 export class CoreFaIconDirective implements AfterViewInit, OnChanges {
 
-    /**
-     * Object used to store whether icons exist or not during development.
-     */
-    private static readonly DEV_ICONS_STATUS: Record<string, Promise<boolean>> = {};
-
-    protected static aliases?: CorePromisedValue<Record<string, string>>;
-
     @Input() name = '';
 
     protected element: HTMLElement;
@@ -95,19 +86,19 @@ export class CoreFaIconDirective implements AfterViewInit, OnChanges {
         iconName = iconName.substring(parts[0].length + 1);
 
         // Set it here to avoid loading unexisting icon paths (svg/iconName) caused by the tick delay of the checkIconAlias promise.
-        let src = `assets/fonts/${font}/${library}/${iconName}.svg`;
+        let src = CoreIcons.getIconSrc(font, library, iconName);
         this.element.setAttribute('src', src);
 
         if (font === 'font-awesome') {
-            const iconNameChecked = await this.checkIconAlias(iconName);
+            const { fileName } = await CoreIcons.getFontAwesomeIconFileName(iconName);
-            if (iconNameChecked !== iconName) {
+            if (fileName !== iconName) {
-                src = `assets/fonts/${font}/${library}/${iconName}.svg`;
+                src = CoreIcons.getIconSrc(font, library, fileName);
                 this.element.setAttribute('src', src);
             }
         }
 
         this.element.classList.add('faicon');
-        this.validateIcon(this.name, src);
+        CoreIcons.validateIcon(this.name, src);
 
     }
 
@@ -135,77 +126,4 @@ export class CoreFaIconDirective implements AfterViewInit, OnChanges {
         this.setIcon();
     }
 
-    /**
-     * Check icon alias and returns the new icon name.
-     *
-     * @param iconName Icon name.
-     * @returns New icon name.
-     */
-    protected async checkIconAlias(iconName: string): Promise<string> {
-        const aliases = await CoreFaIconDirective.getIconsAliases();
-
-        if (aliases[iconName]) {
-            this.logger.error(`Icon ${iconName} is an alias of ${aliases[iconName]}, please use the new name.`);
-
-            return aliases[iconName];
-        }
-
-        return iconName;
-    }
-
-    /**
-     * Read the icon aliases json file.
-     *
-     * @returns Promise resolved when loaded.
-     */
-    protected static async getIconsAliases(): Promise<Record<string, string>> {
-        if (CoreFaIconDirective.aliases !== undefined) {
-            return CoreFaIconDirective.aliases;
-        }
-
-        CoreFaIconDirective.aliases = new CorePromisedValue();
-
-        try {
-            const aliases = await Http.get<Record<string, string>>('assets/fonts/font-awesome/aliases.json', {
-                responseType: 'json',
-            }).toPromise();
-
-            CoreFaIconDirective.aliases.resolve(aliases);
-
-            return aliases;
-        } catch {
-            CoreFaIconDirective.aliases.resolve({});
-
-            return {};
-        }
-    }
-
-    /**
-     * Validate that an icon exists, or show warning otherwise (only in development and testing environments).
-     *
-     * @param name Icon name.
-     * @param src Icon source url.
-     */
-    private validateIcon(name: string, src: string): void {
-        if (!CoreConstants.BUILD.isDevelopment && !CoreConstants.BUILD.isTesting) {
-            return;
-        }
-
-        if (!(src in CoreFaIconDirective.DEV_ICONS_STATUS)) {
-            CoreFaIconDirective.DEV_ICONS_STATUS[src] = Http.get(src, { responseType: 'text' })
-                .toPromise()
-                .then(() => true)
-                .catch(() => false);
-        }
-
-        // eslint-disable-next-line promise/catch-or-return
-        CoreFaIconDirective.DEV_ICONS_STATUS[src].then(exists => {
-            if (exists) {
-                return;
-            }
-
-            return this.logger.error(`Icon ${name} not found`);
-        });
-    }
-
 }

src/core/directives/format-text.ts

@@ -54,6 +54,7 @@ import { ElementController } from '@classes/element-controllers/ElementControlle
 import { MediaElementController } from '@classes/element-controllers/MediaElementController';
 import { FrameElementController } from '@classes/element-controllers/FrameElementController';
 import { CoreUrl } from '@singletons/url';
+import { CoreIcons } from '@singletons/icons';
 
 /**
  * Directive to format text rendered. It renders the HTML and treats all links and media, using CoreLinkDirective
@@ -278,10 +279,10 @@ export class CoreFormatTextDirective implements OnChanges, OnDestroy, AsyncDirec
             button.classList.add('core-image-viewer-icon');
             button.classList.add('hidden');
             button.setAttribute('aria-label', label);
+            const iconName = 'up-right-and-down-left-from-center';
+            const src = CoreIcons.getIconSrc('font-awesome', 'solid', iconName);
             // Add an ion-icon item to apply the right styles, but the ion-icon component won't be executed.
-            button.innerHTML = '<ion-icon name="fas-up-right-and-down-left-from-center" aria-hidden="true" \
+            button.innerHTML = `<ion-icon name="fas-${iconName}" aria-hidden="true" src="${src}"></ion-icon>`;
-                src="assets/fonts/font-awesome/solid/up-right-and-down-left-from-center.svg">\
-            </ion-icon>';
 
             button.addEventListener('click', (e: Event) => {
                 e.preventDefault();
@@ -478,6 +479,7 @@ export class CoreFormatTextDirective implements OnChanges, OnDestroy, AsyncDirec
         const videos = Array.from(div.querySelectorAll('video'));
         const iframes = Array.from(div.querySelectorAll('iframe'));
         const buttons = Array.from(div.querySelectorAll('.button'));
+        const icons = Array.from(div.querySelectorAll('i.fa,i.fas,i.far,i.fab'));
         const elementsWithInlineStyles = Array.from(div.querySelectorAll('*[style]'));
         const stopClicksElements = Array.from(div.querySelectorAll('button,input,select,textarea'));
         const frames = Array.from(div.querySelectorAll(CoreIframeUtilsProvider.FRAME_TAGS.join(',').replace(/iframe,?/, '')));
@@ -550,6 +552,11 @@ export class CoreFormatTextDirective implements OnChanges, OnDestroy, AsyncDirec
             }
         });
 
+        // Handle Font Awesome icons to be rendered by the app.
+        icons.forEach((icon) => {
+            CoreIcons.replaceCSSIcon(icon);
+        });
+
         // Handle inline styles.
         elementsWithInlineStyles.forEach((el: HTMLElement) => {
             // Only add external content for tags that haven't been treated already.

src/core/features/question/services/question-helper.ts

@@ -26,6 +26,7 @@ import { CoreWSFile } from '@services/ws';
 import { makeSingleton, Translate } from '@singletons';
 import { CoreQuestion, CoreQuestionProvider, CoreQuestionQuestionParsed, CoreQuestionsAnswers } from './question';
 import { CoreQuestionDelegate } from './question-delegate';
+import { CoreIcons } from '@singletons/icons';
 
 /**
  * Service with some common functions to handle questions.
@@ -801,12 +802,14 @@ export class CoreQuestionHelperProvider {
             const newIcon: HTMLIonIconElement = document.createElement('ion-icon');
 
             if (correct) {
-                newIcon.setAttribute('name', 'fas-check');
+                const iconName = 'check';
-                newIcon.setAttribute('src', 'assets/fonts/font-awesome/solid/check.svg');
+                newIcon.setAttribute('name', `fas-${iconName}`);
+                newIcon.setAttribute('src', CoreIcons.getIconSrc('font-awesome', 'solid', iconName));
                 newIcon.className = 'core-correct-icon ion-color ion-color-success questioncorrectnessicon';
             } else {
-                newIcon.setAttribute('name', 'fas-xmark');
+                const iconName = 'xmark';
-                newIcon.setAttribute('src', 'assets/fonts/font-awesome/solid/xmark.svg');
+                newIcon.setAttribute('name', `fas-${iconName}`);
+                newIcon.setAttribute('src', CoreIcons.getIconSrc('font-awesome', 'solid', iconName));
                 newIcon.className = 'core-correct-icon ion-color ion-color-danger questioncorrectnessicon';
             }
 

src/core/singletons/icons.ts

@@ -0,0 +1,198 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Http } from '@singletons';
+import { CoreConstants } from '../constants';
+import { CoreLogger } from './logger';
+import aliases from '@/assets/fonts/font-awesome/aliases.json';
+
+/**
+ * Singleton with helper functions for icon management.
+ */
+export class CoreIcons {
+
+    /**
+     * Object used to store whether icons exist or not during development.
+     */
+    private static readonly DEV_ICONS_STATUS: Record<string, Promise<boolean>> = {};
+
+    private static readonly ALIASES = { ...aliases } as unknown as Record<string, string>;
+
+    protected static logger = CoreLogger.getInstance('CoreIcons');
+
+    /**
+     * Check icon alias and returns the new icon name.
+     *
+     * @param icon Icon name.
+     * @returns New icon name and new library if changed.
+     */
+    static async getFontAwesomeIconFileName(icon: string): Promise<{fileName: string; newLibrary?: string}> {
+        let newLibrary: string | undefined = undefined;
+        if (icon.endsWith('-o')) {
+            newLibrary = 'regular';
+            icon = icon.substring(0, icon.length - 2);
+        }
+
+        if (CoreIcons.ALIASES[icon]) {
+            this.logger.error(`Icon ${icon} is an alias of ${CoreIcons.ALIASES[icon]}, please use the new name.`);
+
+            return { newLibrary, fileName: CoreIcons.ALIASES[icon] };
+        }
+
+        return { newLibrary, fileName: icon };
+    }
+
+    /**
+     * Validate that an icon exists, or show warning otherwise (only in development and testing environments).
+     *
+     * @param name Icon name.
+     * @param src Icon source url.
+     */
+    static validateIcon(name: string, src: string): void {
+        if (!CoreConstants.BUILD.isDevelopment && !CoreConstants.BUILD.isTesting) {
+            return;
+        }
+
+        if (!(src in CoreIcons.DEV_ICONS_STATUS)) {
+            CoreIcons.DEV_ICONS_STATUS[src] = Http.get(src, { responseType: 'text' })
+                .toPromise()
+                .then(() => true)
+                .catch(() => false);
+        }
+
+        // eslint-disable-next-line promise/catch-or-return
+        CoreIcons.DEV_ICONS_STATUS[src].then(exists => {
+            if (exists) {
+                return;
+            }
+
+            return this.logger.error(`Icon ${name} not found`);
+        });
+    }
+
+    /**
+     * Replaces an <i> icon that uses CSS by a ion-icon with SVG.
+     * It supports from 4.7 to 6.4 Font awesome versions.
+     * But it can fail on 4.7 and 5.x because of the lack of assets.
+     *
+     * @param icon Current icon element.
+     * @returns New icon, already included in the DOM.
+     */
+    static async replaceCSSIcon(icon: Element): Promise<HTMLIonIconElement | undefined> {
+        let library = 'solid';
+        let iconName = '';
+
+        Array.from(icon.classList).forEach(async (className) => {
+            // Library name of 5.x
+            switch (className) {
+                case 'fas':
+                    library = 'solid';
+
+                    return;
+                case 'far':
+                    library = 'regular';
+
+                    return;
+                case 'fab':
+                    library = 'brands';
+
+                    return;
+            }
+
+            // Check fa- style class names.
+            const faPart = className.match(/fa-([a-zA-Z0-9-]+)/);
+            if (!faPart) {
+                return;
+            }
+
+            const firstPart = faPart[1].split('-')[0];
+
+            switch (firstPart) {
+                // Class is defining library.
+                case 'solid':
+                    library = 'solid';
+                    break;
+                case 'regular':
+                case 'light':
+                    library = 'regular';
+                    break;
+                case 'brands':
+                    library = 'brands';
+                    break;
+                // Class is defining special cases.
+                case '2xs':
+                case 'xs':
+                case 'sm':
+                case 'lg':
+                case 'xl':
+                case '2xl':
+                case 'fw':
+                case 'sharp':
+                case 'rotate':
+                    return;
+                // Class is defining the icon name (fa-ICONNAME).
+                default:
+                    iconName = faPart[1];
+                    break;
+            }
+        });
+
+        if (!iconName) {
+            return;
+        }
+
+        const newIcon = document.createElement('ion-icon');
+
+        Array.from(icon.attributes).forEach(attr => {
+            newIcon.setAttribute(attr.nodeName, attr.nodeValue || '');
+        });
+
+        if (!newIcon.getAttribute('aria-label') &&
+                !newIcon.getAttribute('aria-labelledby') &&
+                !newIcon.getAttribute('title')) {
+            newIcon.setAttribute('aria-hidden', 'true');
+        }
+
+        const { fileName, newLibrary } = await CoreIcons.getFontAwesomeIconFileName(iconName);
+        if (newLibrary) {
+            library = newLibrary;
+        }
+        iconName = fileName;
+
+        const src = CoreIcons.getIconSrc('font-awesome', library, iconName);
+
+        newIcon.setAttribute('src', src);
+
+        newIcon.classList.add('faicon');
+        CoreIcons.validateIcon(iconName, src);
+
+        icon.parentElement?.insertBefore(newIcon, icon);
+        icon.remove();
+
+        return newIcon;
+    }
+
+    /**
+     * Get icon SVG path.
+     *
+     * @param font Font Family.
+     * @param library Library to use.
+     * @param icon Icon Name.
+     * @returns Path.
+     */
+    static getIconSrc(font: string, library: string, icon: string): string {
+        return `assets/fonts/${font}/${library}/${icon}.svg`;
+    }
+
+}

src/core/singletons/tests/icons.test.ts

@@ -0,0 +1,84 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { CoreIcons } from '@singletons/icons';
+
+describe('CoreIcons singleton', () => {
+
+    it('replaces CSS icon with the correspondant ion-icon', async () => {
+        const icon = document.createElement('i');
+
+        // Not an icon
+        icon.className = 'test';
+        expect((await CoreIcons.replaceCSSIcon(icon)))
+            .toEqual(undefined);
+
+        icon.className = 'fas fanoicon';
+        expect((await CoreIcons.replaceCSSIcon(icon)))
+            .toEqual(undefined);
+
+        icon.className = 'fa-solid fanoicon';
+        expect((await CoreIcons.replaceCSSIcon(icon)))
+            .toEqual(undefined);
+
+        // Font awesome 6
+        icon.className = 'fa-solid fa-face-awesome';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/solid/face-awesome.svg');
+
+        icon.className = 'fa-regular fa-face-awesome';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/regular/face-awesome.svg');
+
+        icon.className = 'fa-light fa-face-awesome';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/regular/face-awesome.svg');
+
+        icon.className = 'fa-brands fa-facebook';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/brands/facebook.svg');
+
+        // Font awesome 5
+        icon.className = 'fas fa-yin-yang';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/solid/yin-yang.svg');
+
+        icon.className = 'far fa-wrench';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/regular/wrench.svg');
+
+        icon.className = 'fab fa-youtube';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/brands/youtube.svg');
+
+        // Font awesome 4.7
+        icon.className = 'fa fa-address-book';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/solid/address-book.svg');
+
+        icon.className = 'fa fa-address-book-o';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/regular/address-book.svg');
+
+        // Aliases
+        icon.className = 'fas fa-battery-5';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/solid/battery-full.svg');
+
+        icon.className = 'fa fa-check-square';
+        expect((await CoreIcons.replaceCSSIcon(icon))?.getAttribute('src'))
+            .toEqual('assets/fonts/font-awesome/solid/square-check.svg');
+    });
+
+});

upgrade.txt

@@ -4,6 +4,7 @@ information provided here is intended especially for developers.
 === 4.3.0 ===
 
  - CoreSiteBasicInfo fullName attribute has changed to fullname and avatar to userpictureurl to match user fields.
+ - Font Awesome icon library has been updated to 6.4.0. But nothing has changed, only version number.
 
 === 4.2.0 ===