mirror of https://github.com/vector-im/riot-web
584 lines
21 KiB
JavaScript
584 lines
21 KiB
JavaScript
/*
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Copyright 2015, 2016 OpenMarket Ltd
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Copyright 2017, 2018 New Vector Ltd
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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'use strict';
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import ReplyThread from "./components/views/elements/ReplyThread";
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import React from 'react';
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import sanitizeHtml from 'sanitize-html';
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import highlight from 'highlight.js';
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import * as linkify from 'linkifyjs';
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import linkifyMatrix from './linkify-matrix';
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import _linkifyElement from 'linkifyjs/element';
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import _linkifyString from 'linkifyjs/string';
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import escape from 'lodash/escape';
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import emojione from 'emojione';
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import classNames from 'classnames';
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import MatrixClientPeg from './MatrixClientPeg';
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import url from 'url';
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linkifyMatrix(linkify);
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emojione.imagePathSVG = 'emojione/svg/';
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// Store PNG path for displaying many flags at once (for increased performance over SVG)
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emojione.imagePathPNG = 'emojione/png/';
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// Use SVGs for emojis
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emojione.imageType = 'svg';
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// Anything outside the basic multilingual plane will be a surrogate pair
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const SURROGATE_PAIR_PATTERN = /([\ud800-\udbff])([\udc00-\udfff])/;
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// And there a bunch more symbol characters that emojione has within the
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// BMP, so this includes the ranges from 'letterlike symbols' to
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// 'miscellaneous symbols and arrows' which should catch all of them
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// (with plenty of false positives, but that's OK)
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const SYMBOL_PATTERN = /([\u2100-\u2bff])/;
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// Regex pattern for Zero-Width joiner unicode characters
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const ZWJ_REGEX = new RegExp("\u200D|\u2003", "g");
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// Regex pattern for whitespace characters
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const WHITESPACE_REGEX = new RegExp("\\s", "g");
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// And this is emojione's complete regex
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const EMOJI_REGEX = new RegExp(emojione.unicodeRegexp+"+", "gi");
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const COLOR_REGEX = /^#[0-9a-fA-F]{6}$/;
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const PERMITTED_URL_SCHEMES = ['http', 'https', 'ftp', 'mailto', 'magnet'];
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/*
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* Return true if the given string contains emoji
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* Uses a much, much simpler regex than emojione's so will give false
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* positives, but useful for fast-path testing strings to see if they
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* need emojification.
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* unicodeToImage uses this function.
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*/
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export function containsEmoji(str) {
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return SURROGATE_PAIR_PATTERN.test(str) || SYMBOL_PATTERN.test(str);
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}
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/* modified from https://github.com/Ranks/emojione/blob/master/lib/js/emojione.js
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* because we want to include emoji shortnames in title text
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*/
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function unicodeToImage(str, addAlt) {
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if (addAlt === undefined) addAlt = true;
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let replaceWith; let unicode; let short; let fname;
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const mappedUnicode = emojione.mapUnicodeToShort();
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str = str.replace(emojione.regUnicode, function(unicodeChar) {
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if ( (typeof unicodeChar === 'undefined') || (unicodeChar === '') || (!(unicodeChar in emojione.jsEscapeMap)) ) {
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// if the unicodeChar doesnt exist just return the entire match
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return unicodeChar;
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} else {
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// get the unicode codepoint from the actual char
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unicode = emojione.jsEscapeMap[unicodeChar];
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short = mappedUnicode[unicode];
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fname = emojione.emojioneList[short].fname;
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// depending on the settings, we'll either add the native unicode as the alt tag, otherwise the shortname
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const title = mappedUnicode[unicode];
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if (addAlt) {
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const alt = (emojione.unicodeAlt) ? emojione.convert(unicode.toUpperCase()) : mappedUnicode[unicode];
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replaceWith = `<img class="mx_emojione" title="${title}" alt="${alt}" src="${emojione.imagePathSVG}${fname}.svg${emojione.cacheBustParam}"/>`;
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} else {
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replaceWith = `<img class="mx_emojione" src="${emojione.imagePathSVG}${fname}.svg${emojione.cacheBustParam}"/>`;
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}
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return replaceWith;
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}
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});
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return str;
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}
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/**
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* Returns the shortcode for an emoji character.
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*
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* @param {String} char The emoji character
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* @return {String} The shortcode (such as :thumbup:)
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*/
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export function unicodeToShort(char) {
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const unicode = emojione.jsEscapeMap[char];
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return emojione.mapUnicodeToShort()[unicode];
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}
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/**
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* Given one or more unicode characters (represented by unicode
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* character number), return an image node with the corresponding
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* emoji.
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*
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* @param alt {string} String to use for the image alt text
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* @param useSvg {boolean} Whether to use SVG image src. If False, PNG will be used.
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* @param unicode {integer} One or more integers representing unicode characters
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* @returns A img node with the corresponding emoji
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*/
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export function charactersToImageNode(alt, useSvg, ...unicode) {
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const fileName = unicode.map((u) => {
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return u.toString(16);
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}).join('-');
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const path = useSvg ? emojione.imagePathSVG : emojione.imagePathPNG;
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const fileType = useSvg ? 'svg' : 'png';
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return <img
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alt={alt}
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src={`${path}${fileName}.${fileType}${emojione.cacheBustParam}`}
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/>;
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}
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export function processHtmlForSending(html: string): string {
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const contentDiv = document.createElement('div');
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contentDiv.innerHTML = html;
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if (contentDiv.children.length === 0) {
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return contentDiv.innerHTML;
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}
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let contentHTML = "";
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for (let i=0; i < contentDiv.children.length; i++) {
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const element = contentDiv.children[i];
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if (element.tagName.toLowerCase() === 'p') {
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contentHTML += element.innerHTML;
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// Don't add a <br /> for the last <p>
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if (i !== contentDiv.children.length - 1) {
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contentHTML += '<br />';
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}
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} else {
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const temp = document.createElement('div');
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temp.appendChild(element.cloneNode(true));
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contentHTML += temp.innerHTML;
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}
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}
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return contentHTML;
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}
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/*
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* Given an untrusted HTML string, return a React node with an sanitized version
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* of that HTML.
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*/
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export function sanitizedHtmlNode(insaneHtml) {
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const saneHtml = sanitizeHtml(insaneHtml, sanitizeHtmlParams);
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return <div dangerouslySetInnerHTML={{ __html: saneHtml }} dir="auto" />;
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}
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/**
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* Tests if a URL from an untrusted source may be safely put into the DOM
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* The biggest threat here is javascript: URIs.
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* Note that the HTML sanitiser library has its own internal logic for
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* doing this, to which we pass the same list of schemes. This is used in
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* other places we need to sanitise URLs.
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* @return true if permitted, otherwise false
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*/
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export function isUrlPermitted(inputUrl) {
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try {
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const parsed = url.parse(inputUrl);
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if (!parsed.protocol) return false;
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// URL parser protocol includes the trailing colon
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return PERMITTED_URL_SCHEMES.includes(parsed.protocol.slice(0, -1));
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} catch (e) {
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return false;
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}
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}
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const transformTags = { // custom to matrix
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// add blank targets to all hyperlinks except vector URLs
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'a': function(tagName, attribs) {
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if (attribs.href) {
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attribs.target = '_blank'; // by default
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let m;
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// FIXME: horrible duplication with linkify-matrix
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m = attribs.href.match(linkifyMatrix.VECTOR_URL_PATTERN);
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if (m) {
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attribs.href = m[1];
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delete attribs.target;
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} else {
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m = attribs.href.match(linkifyMatrix.MATRIXTO_URL_PATTERN);
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if (m) {
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const entity = m[1];
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switch (entity[0]) {
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case '@':
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attribs.href = '#/user/' + entity;
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break;
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case '+':
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attribs.href = '#/group/' + entity;
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break;
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case '#':
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case '!':
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attribs.href = '#/room/' + entity;
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break;
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}
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delete attribs.target;
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}
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}
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}
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attribs.rel = 'noopener'; // https://mathiasbynens.github.io/rel-noopener/
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return { tagName, attribs };
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},
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'img': function(tagName, attribs) {
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// Strip out imgs that aren't `mxc` here instead of using allowedSchemesByTag
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// because transformTags is used _before_ we filter by allowedSchemesByTag and
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// we don't want to allow images with `https?` `src`s.
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if (!attribs.src || !attribs.src.startsWith('mxc://')) {
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return { tagName, attribs: {}};
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}
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attribs.src = MatrixClientPeg.get().mxcUrlToHttp(
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attribs.src,
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attribs.width || 800,
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attribs.height || 600,
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);
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return { tagName, attribs };
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},
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'code': function(tagName, attribs) {
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if (typeof attribs.class !== 'undefined') {
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// Filter out all classes other than ones starting with language- for syntax highlighting.
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const classes = attribs.class.split(/\s/).filter(function(cl) {
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return cl.startsWith('language-');
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});
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attribs.class = classes.join(' ');
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}
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return { tagName, attribs };
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},
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'*': function(tagName, attribs) {
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// Delete any style previously assigned, style is an allowedTag for font and span
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// because attributes are stripped after transforming
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delete attribs.style;
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// Sanitise and transform data-mx-color and data-mx-bg-color to their CSS
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// equivalents
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const customCSSMapper = {
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'data-mx-color': 'color',
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'data-mx-bg-color': 'background-color',
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// $customAttributeKey: $cssAttributeKey
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};
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let style = "";
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Object.keys(customCSSMapper).forEach((customAttributeKey) => {
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const cssAttributeKey = customCSSMapper[customAttributeKey];
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const customAttributeValue = attribs[customAttributeKey];
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if (customAttributeValue &&
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typeof customAttributeValue === 'string' &&
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COLOR_REGEX.test(customAttributeValue)
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) {
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style += cssAttributeKey + ":" + customAttributeValue + ";";
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delete attribs[customAttributeKey];
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}
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});
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if (style) {
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attribs.style = style;
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}
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return { tagName, attribs };
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},
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};
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const sanitizeHtmlParams = {
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allowedTags: [
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'font', // custom to matrix for IRC-style font coloring
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'del', // for markdown
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'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'p', 'a', 'ul', 'ol', 'sup', 'sub',
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'nl', 'li', 'b', 'i', 'u', 'strong', 'em', 'strike', 'code', 'hr', 'br', 'div',
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'table', 'thead', 'caption', 'tbody', 'tr', 'th', 'td', 'pre', 'span', 'img',
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],
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allowedAttributes: {
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// custom ones first:
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font: ['color', 'data-mx-bg-color', 'data-mx-color', 'style'], // custom to matrix
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span: ['data-mx-bg-color', 'data-mx-color', 'style'], // custom to matrix
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a: ['href', 'name', 'target', 'rel'], // remote target: custom to matrix
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img: ['src', 'width', 'height', 'alt', 'title'],
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ol: ['start'],
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code: ['class'], // We don't actually allow all classes, we filter them in transformTags
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},
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// Lots of these won't come up by default because we don't allow them
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selfClosing: ['img', 'br', 'hr', 'area', 'base', 'basefont', 'input', 'link', 'meta'],
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// URL schemes we permit
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allowedSchemes: PERMITTED_URL_SCHEMES,
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allowProtocolRelative: false,
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transformTags,
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};
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// this is the same as the above except with less rewriting
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const composerSanitizeHtmlParams = Object.assign({}, sanitizeHtmlParams);
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composerSanitizeHtmlParams.transformTags = {
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'code': transformTags['code'],
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'*': transformTags['*'],
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};
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class BaseHighlighter {
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constructor(highlightClass, highlightLink) {
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this.highlightClass = highlightClass;
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this.highlightLink = highlightLink;
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}
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/**
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* apply the highlights to a section of text
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*
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* @param {string} safeSnippet The snippet of text to apply the highlights
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* to.
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* @param {string[]} safeHighlights A list of substrings to highlight,
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* sorted by descending length.
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*
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* returns a list of results (strings for HtmlHighligher, react nodes for
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* TextHighlighter).
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*/
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applyHighlights(safeSnippet, safeHighlights) {
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let lastOffset = 0;
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let offset;
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let nodes = [];
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const safeHighlight = safeHighlights[0];
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while ((offset = safeSnippet.toLowerCase().indexOf(safeHighlight.toLowerCase(), lastOffset)) >= 0) {
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// handle preamble
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if (offset > lastOffset) {
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var subSnippet = safeSnippet.substring(lastOffset, offset);
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nodes = nodes.concat(this._applySubHighlights(subSnippet, safeHighlights));
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}
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// do highlight. use the original string rather than safeHighlight
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// to preserve the original casing.
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const endOffset = offset + safeHighlight.length;
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nodes.push(this._processSnippet(safeSnippet.substring(offset, endOffset), true));
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lastOffset = endOffset;
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}
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// handle postamble
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if (lastOffset !== safeSnippet.length) {
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subSnippet = safeSnippet.substring(lastOffset, undefined);
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nodes = nodes.concat(this._applySubHighlights(subSnippet, safeHighlights));
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}
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return nodes;
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}
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_applySubHighlights(safeSnippet, safeHighlights) {
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if (safeHighlights[1]) {
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// recurse into this range to check for the next set of highlight matches
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return this.applyHighlights(safeSnippet, safeHighlights.slice(1));
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} else {
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// no more highlights to be found, just return the unhighlighted string
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return [this._processSnippet(safeSnippet, false)];
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}
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}
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}
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class HtmlHighlighter extends BaseHighlighter {
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/* highlight the given snippet if required
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*
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* snippet: content of the span; must have been sanitised
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* highlight: true to highlight as a search match
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*
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* returns an HTML string
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*/
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_processSnippet(snippet, highlight) {
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if (!highlight) {
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// nothing required here
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return snippet;
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}
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let span = "<span class=\""+this.highlightClass+"\">"
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+ snippet + "</span>";
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if (this.highlightLink) {
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span = "<a href=\""+encodeURI(this.highlightLink)+"\">"
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+span+"</a>";
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}
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return span;
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}
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}
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class TextHighlighter extends BaseHighlighter {
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constructor(highlightClass, highlightLink) {
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super(highlightClass, highlightLink);
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this._key = 0;
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}
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/* create a <span> node to hold the given content
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*
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* snippet: content of the span
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* highlight: true to highlight as a search match
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*
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* returns a React node
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*/
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_processSnippet(snippet, highlight) {
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const key = this._key++;
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let node =
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<span key={key} className={highlight ? this.highlightClass : null}>
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{ snippet }
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</span>;
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if (highlight && this.highlightLink) {
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node = <a key={key} href={this.highlightLink}>{ node }</a>;
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}
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return node;
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}
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}
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/* turn a matrix event body into html
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*
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* content: 'content' of the MatrixEvent
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*
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* highlights: optional list of words to highlight, ordered by longest word first
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*
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* opts.highlightLink: optional href to add to highlighted words
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* opts.disableBigEmoji: optional argument to disable the big emoji class.
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* opts.stripReplyFallback: optional argument specifying the event is a reply and so fallback needs removing
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* opts.returnString: return an HTML string rather than JSX elements
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* opts.emojiOne: optional param to do emojiOne (default true)
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* opts.forComposerQuote: optional param to lessen the url rewriting done by sanitization, for quoting into composer
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*/
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export function bodyToHtml(content, highlights, opts={}) {
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const isHtmlMessage = content.format === "org.matrix.custom.html" && content.formatted_body;
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const doEmojiOne = opts.emojiOne === undefined ? true : opts.emojiOne;
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let bodyHasEmoji = false;
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let sanitizeParams = sanitizeHtmlParams;
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if (opts.forComposerQuote) {
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sanitizeParams = composerSanitizeHtmlParams;
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}
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let strippedBody;
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let safeBody;
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let isDisplayedWithHtml;
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// XXX: We sanitize the HTML whilst also highlighting its text nodes, to avoid accidentally trying
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// to highlight HTML tags themselves. However, this does mean that we don't highlight textnodes which
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// are interrupted by HTML tags (not that we did before) - e.g. foo<span/>bar won't get highlighted
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// by an attempt to search for 'foobar'. Then again, the search query probably wouldn't work either
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try {
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if (highlights && highlights.length > 0) {
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const highlighter = new HtmlHighlighter("mx_EventTile_searchHighlight", opts.highlightLink);
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const safeHighlights = highlights.map(function(highlight) {
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return sanitizeHtml(highlight, sanitizeParams);
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});
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// XXX: hacky bodge to temporarily apply a textFilter to the sanitizeParams structure.
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sanitizeParams.textFilter = function(safeText) {
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return highlighter.applyHighlights(safeText, safeHighlights).join('');
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};
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}
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let formattedBody = content.formatted_body;
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if (opts.stripReplyFallback && formattedBody) formattedBody = ReplyThread.stripHTMLReply(formattedBody);
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strippedBody = opts.stripReplyFallback ? ReplyThread.stripPlainReply(content.body) : content.body;
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if (doEmojiOne) {
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bodyHasEmoji = containsEmoji(isHtmlMessage ? formattedBody : content.body);
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}
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// Only generate safeBody if the message was sent as org.matrix.custom.html
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if (isHtmlMessage) {
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isDisplayedWithHtml = true;
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safeBody = sanitizeHtml(formattedBody, sanitizeParams);
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} else {
|
|
// ... or if there are emoji, which we insert as HTML alongside the
|
|
// escaped plaintext body.
|
|
if (bodyHasEmoji) {
|
|
isDisplayedWithHtml = true;
|
|
safeBody = sanitizeHtml(escape(strippedBody), sanitizeParams);
|
|
}
|
|
}
|
|
|
|
// An HTML message with emoji
|
|
// or a plaintext message with emoji that was escaped and sanitized into
|
|
// HTML.
|
|
if (bodyHasEmoji) {
|
|
safeBody = unicodeToImage(safeBody);
|
|
}
|
|
} finally {
|
|
delete sanitizeParams.textFilter;
|
|
}
|
|
|
|
if (opts.returnString) {
|
|
return isDisplayedWithHtml ? safeBody : strippedBody;
|
|
}
|
|
|
|
let emojiBody = false;
|
|
if (!opts.disableBigEmoji && bodyHasEmoji) {
|
|
EMOJI_REGEX.lastIndex = 0;
|
|
let contentBodyTrimmed = strippedBody !== undefined ? strippedBody.trim() : '';
|
|
|
|
// Ignore spaces in body text. Emojis with spaces in between should
|
|
// still be counted as purely emoji messages.
|
|
contentBodyTrimmed = contentBodyTrimmed.replace(WHITESPACE_REGEX, '');
|
|
|
|
// Remove zero width joiner characters from emoji messages. This ensures
|
|
// that emojis that are made up of multiple unicode characters are still
|
|
// presented as large.
|
|
contentBodyTrimmed = contentBodyTrimmed.replace(ZWJ_REGEX, '');
|
|
|
|
const match = EMOJI_REGEX.exec(contentBodyTrimmed);
|
|
emojiBody = match && match[0] && match[0].length === contentBodyTrimmed.length
|
|
// Prevent user pills expanding for users with only emoji in
|
|
// their username
|
|
&& (content.formatted_body == undefined
|
|
|| !content.formatted_body.includes("https://matrix.to/"));
|
|
}
|
|
|
|
const className = classNames({
|
|
'mx_EventTile_body': true,
|
|
'mx_EventTile_bigEmoji': emojiBody,
|
|
'markdown-body': isHtmlMessage,
|
|
});
|
|
|
|
return isDisplayedWithHtml ?
|
|
<span key="body" className={className} dangerouslySetInnerHTML={{ __html: safeBody }} dir="auto" /> :
|
|
<span key="body" className={className} dir="auto">{ strippedBody }</span>;
|
|
}
|
|
|
|
export function emojifyText(text, addAlt) {
|
|
return {
|
|
__html: unicodeToImage(escape(text), addAlt),
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Linkifies the given string. This is a wrapper around 'linkifyjs/string'.
|
|
*
|
|
* @param {string} str
|
|
* @returns {string}
|
|
*/
|
|
export function linkifyString(str) {
|
|
return _linkifyString(str);
|
|
}
|
|
|
|
/**
|
|
* Linkifies the given DOM element. This is a wrapper around 'linkifyjs/element'.
|
|
*
|
|
* @param {object} element DOM element to linkify
|
|
* @param {object} [options] Options for linkifyElement. Default: linkifyMatrix.options
|
|
* @returns {object}
|
|
*/
|
|
export function linkifyElement(element, options = linkifyMatrix.options) {
|
|
return _linkifyElement(element, options);
|
|
}
|
|
|
|
/**
|
|
* Linkify the given string and sanitize the HTML afterwards.
|
|
*
|
|
* @param {string} dirtyHtml The HTML string to sanitize and linkify
|
|
* @returns {string}
|
|
*/
|
|
export function linkifyAndSanitizeHtml(dirtyHtml) {
|
|
return sanitizeHtml(linkifyString(dirtyHtml), sanitizeHtmlParams);
|
|
}
|