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-rw-r--r--ext/bg/js/clipboard-reader.js169
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diff --git a/ext/bg/js/clipboard-reader.js b/ext/bg/js/clipboard-reader.js
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--- a/ext/bg/js/clipboard-reader.js
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-/*
- * Copyright (C) 2020-2021 Yomichan Authors
- *
- * This program 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.
- *
- * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
- */
-
-/**
- * Class which can read text and images from the clipboard.
- */
-class ClipboardReader {
- /**
- * Creates a new instances of a clipboard reader.
- * @param document The Document object to be used, or null for no support.
- * @param pasteTargetSelector The selector for the paste target element.
- * @param imagePasteTargetSelector The selector for the image paste target element.
- */
- constructor({document=null, pasteTargetSelector=null, imagePasteTargetSelector=null, mediaUtility=null}) {
- this._document = document;
- this._browser = null;
- this._pasteTarget = null;
- this._pasteTargetSelector = pasteTargetSelector;
- this._imagePasteTarget = null;
- this._imagePasteTargetSelector = imagePasteTargetSelector;
- this._mediaUtility = mediaUtility;
- }
-
- /**
- * Gets the browser being used.
- */
- get browser() {
- return this._browser;
- }
-
- /**
- * Assigns the browser being used.
- */
- set browser(value) {
- this._browser = value;
- }
-
- /**
- * Gets the text in the clipboard.
- * @returns A string containing the clipboard text.
- * @throws Error if not supported.
- */
- async getText() {
- /*
- Notes:
- document.execCommand('paste') doesn't work on Firefox.
- See: https://bugzilla.mozilla.org/show_bug.cgi?id=1603985
- Therefore, navigator.clipboard.readText() is used on Firefox.
-
- navigator.clipboard.readText() can't be used in Chrome for two reasons:
- * Requires page to be focused, else it rejects with an exception.
- * When the page is focused, Chrome will request clipboard permission, despite already
- being an extension with clipboard permissions. It effectively asks for the
- non-extension permission for clipboard access.
- */
- if (this._isFirefox()) {
- try {
- return await navigator.clipboard.readText();
- } catch (e) {
- // Error is undefined, due to permissions
- throw new Error('Cannot read clipboard text; check extension permissions');
- }
- }
-
- const document = this._document;
- if (document === null) {
- throw new Error('Clipboard reading not supported in this context');
- }
-
- let target = this._pasteTarget;
- if (target === null) {
- target = document.querySelector(this._pasteTargetSelector);
- if (target === null) {
- throw new Error('Clipboard paste target does not exist');
- }
- this._pasteTarget = target;
- }
-
- target.value = '';
- target.focus();
- document.execCommand('paste');
- const result = target.value;
- target.value = '';
- return (typeof result === 'string' ? result : '');
- }
-
- /**
- * Gets the first image in the clipboard.
- * @returns A string containing a data URL of the image file, or null if no image was found.
- * @throws Error if not supported.
- */
- async getImage() {
- // See browser-specific notes in getText
- if (
- this._isFirefox() &&
- this._mediaUtility !== null &&
- typeof navigator.clipboard !== 'undefined' &&
- typeof navigator.clipboard.read === 'function'
- ) {
- // This function is behind the Firefox flag: dom.events.asyncClipboard.dataTransfer
- let files;
- try {
- ({files} = await navigator.clipboard.read());
- } catch (e) {
- return null;
- }
-
- for (const file of files) {
- if (this._mediaUtility.getFileExtensionFromImageMediaType(file.type) !== null) {
- return await this._readFileAsDataURL(file);
- }
- }
- return null;
- }
-
- const document = this._document;
- if (document === null) {
- throw new Error('Clipboard reading not supported in this context');
- }
-
- let target = this._imagePasteTarget;
- if (target === null) {
- target = document.querySelector(this._imagePasteTargetSelector);
- if (target === null) {
- throw new Error('Clipboard paste target does not exist');
- }
- this._imagePasteTarget = target;
- }
-
- target.focus();
- document.execCommand('paste');
- const image = target.querySelector('img[src^="data:"]');
- const result = (image !== null ? image.getAttribute('src') : null);
- for (const image2 of target.querySelectorAll('img')) {
- image2.removeAttribute('src');
- }
- target.textContent = '';
- return result;
- }
-
- // Private
-
- _isFirefox() {
- return (this._browser === 'firefox' || this._browser === 'firefox-mobile');
- }
-
- _readFileAsDataURL(file) {
- return new Promise((resolve, reject) => {
- const reader = new FileReader();
- reader.onload = () => resolve(reader.result);
- reader.onerror = () => reject(reader.error);
- reader.readAsDataURL(file);
- });
- }
-}