558 lines
21 KiB
TypeScript
558 lines
21 KiB
TypeScript
/*
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Copyright 2015, 2016 OpenMarket Ltd
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Copyright 2017, 2018 New Vector Ltd
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Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
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Copyright 2019 The Matrix.org Foundation C.I.C.
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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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import React from 'react';
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import sanitizeHtml from 'sanitize-html';
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import { IExtendedSanitizeOptions } from './@types/sanitize-html';
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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 classNames from 'classnames';
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import EMOJIBASE_REGEX from 'emojibase-regex';
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import url from 'url';
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import katex from 'katex';
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import { AllHtmlEntities } from 'html-entities';
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import SettingsStore from './settings/SettingsStore';
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import cheerio from 'cheerio';
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import {tryTransformPermalinkToLocalHref} from "./utils/permalinks/Permalinks";
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import {SHORTCODE_TO_EMOJI, getEmojiFromUnicode} from "./emoji";
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import ReplyThread from "./components/views/elements/ReplyThread";
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import {mediaFromMxc} from "./customisations/Media";
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linkifyMatrix(linkify);
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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 emojibase 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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const BIGEMOJI_REGEX = new RegExp(`^(${EMOJIBASE_REGEX.source})+$`, 'i');
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const COLOR_REGEX = /^#[0-9a-fA-F]{6}$/;
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export const PERMITTED_URL_SCHEMES = ['http', 'https', 'ftp', 'mailto', 'magnet'];
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/*
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* Return true if the given string contains emoji
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* Uses a much, much simpler regex than emojibase's so will give false
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* positives, but useful for fast-path testing strings to see if they
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* need emojification.
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* unicodeToImage uses this function.
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*/
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function mightContainEmoji(str: string) {
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return SURROGATE_PAIR_PATTERN.test(str) || SYMBOL_PATTERN.test(str);
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}
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/**
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* Returns the shortcode for an emoji character.
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*
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* @param {String} char The emoji character
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* @return {String} The shortcode (such as :thumbup:)
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*/
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export function unicodeToShortcode(char: string) {
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const data = getEmojiFromUnicode(char);
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return (data && data.shortcodes ? `:${data.shortcodes[0]}:` : '');
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}
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/**
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* Returns the unicode character for an emoji shortcode
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*
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* @param {String} shortcode The shortcode (such as :thumbup:)
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* @return {String} The emoji character; null if none exists
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*/
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export function shortcodeToUnicode(shortcode: string) {
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shortcode = shortcode.slice(1, shortcode.length - 1);
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const data = SHORTCODE_TO_EMOJI.get(shortcode);
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return data ? data.unicode : null;
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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: string) {
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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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export function sanitizedHtmlNodeInnerText(insaneHtml: string) {
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const saneHtml = sanitizeHtml(insaneHtml, sanitizeHtmlParams);
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const contentDiv = document.createElement("div");
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contentDiv.innerHTML = saneHtml;
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return contentDiv.innerText;
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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: string) {
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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: IExtendedSanitizeOptions["transformTags"] = { // custom to matrix
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// add blank targets to all hyperlinks except vector URLs
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'a': function(tagName: string, attribs: sanitizeHtml.Attributes) {
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if (attribs.href) {
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attribs.target = '_blank'; // by default
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const transformed = tryTransformPermalinkToLocalHref(attribs.href);
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if (transformed !== attribs.href || attribs.href.match(linkifyMatrix.ELEMENT_URL_PATTERN)) {
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attribs.href = transformed;
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delete attribs.target;
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}
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}
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attribs.rel = 'noreferrer 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: string, attribs: sanitizeHtml.Attributes) {
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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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// We also drop inline images (as if they were not present at all) when the "show
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// images" preference is disabled. Future work might expose some UI to reveal them
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// like standalone image events have.
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if (!attribs.src || !attribs.src.startsWith('mxc://') || !SettingsStore.getValue("showImages")) {
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return { tagName, attribs: {}};
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}
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const width = Number(attribs.width) || 800;
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const height = Number(attribs.height) || 600;
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attribs.src = mediaFromMxc(attribs.src).getThumbnailOfSourceHttp(width, height);
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return { tagName, attribs };
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},
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'code': function(tagName: string, attribs: sanitizeHtml.Attributes) {
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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-') && !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: string, attribs: sanitizeHtml.Attributes) {
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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: IExtendedSanitizeOptions = {
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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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'details', 'summary',
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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-maths', 'data-mx-bg-color', 'data-mx-color', 'data-mx-spoiler', 'style'], // custom to matrix
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div: ['data-mx-maths'],
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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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// 50 levels deep "should be enough for anyone"
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nestingLimit: 50,
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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: IExtendedSanitizeOptions = {
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...sanitizeHtmlParams,
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transformTags: {
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'code': transformTags['code'],
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'*': transformTags['*'],
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},
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};
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abstract class BaseHighlighter<T extends React.ReactNode> {
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constructor(public highlightClass: string, public highlightLink: string) {
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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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public applyHighlights(safeSnippet: string, safeHighlights: string[]): T[] {
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let lastOffset = 0;
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let offset;
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let nodes: T[] = [];
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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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const 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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const 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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private applySubHighlights(safeSnippet: string, safeHighlights: string[]): T[] {
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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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protected abstract processSnippet(snippet: string, highlight: boolean): T;
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}
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class HtmlHighlighter extends BaseHighlighter<string> {
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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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protected processSnippet(snippet: string, highlight: boolean): string {
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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}">${snippet}</span>`;
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if (this.highlightLink) {
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span = `<a href="${encodeURI(this.highlightLink)}">${span}</a>`;
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}
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return span;
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}
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}
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interface IContent {
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format?: string;
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// eslint-disable-next-line camelcase
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formatted_body?: string;
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body: string;
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}
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interface IOpts {
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highlightLink?: string;
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disableBigEmoji?: boolean;
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stripReplyFallback?: boolean;
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returnString?: boolean;
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forComposerQuote?: boolean;
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ref?: React.Ref<any>;
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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.forComposerQuote: optional param to lessen the url rewriting done by sanitization, for quoting into composer
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* opts.ref: React ref to attach to any React components returned (not compatible with opts.returnString)
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*/
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export function bodyToHtml(content: IContent, highlights: string[], opts: IOpts = {}) {
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const isHtmlMessage = content.format === "org.matrix.custom.html" && content.formatted_body;
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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: string;
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let safeBody: string;
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let isDisplayedWithHtml: boolean;
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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 = typeof content.formatted_body === 'string' ? content.formatted_body : null;
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const plainBody = typeof content.body === 'string' ? content.body : "";
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if (opts.stripReplyFallback && formattedBody) formattedBody = ReplyThread.stripHTMLReply(formattedBody);
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strippedBody = opts.stripReplyFallback ? ReplyThread.stripPlainReply(plainBody) : plainBody;
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bodyHasEmoji = mightContainEmoji(isHtmlMessage ? formattedBody : plainBody);
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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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if (SettingsStore.getValue("feature_latex_maths")) {
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const phtml = cheerio.load(safeBody,
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{ _useHtmlParser2: true, decodeEntities: false })
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// @ts-ignore - The types for `replaceWith` wrongly expect
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// Cheerio instance to be returned.
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phtml('div, span[data-mx-maths!=""]').replaceWith(function(i, e) {
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return katex.renderToString(
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AllHtmlEntities.decode(phtml(e).attr('data-mx-maths')),
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{
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throwOnError: false,
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displayMode: e.name == 'div',
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output: "htmlAndMathml",
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});
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});
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safeBody = phtml.html();
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}
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}
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} finally {
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delete sanitizeParams.textFilter;
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}
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const contentBody = isDisplayedWithHtml ? safeBody : strippedBody;
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if (opts.returnString) {
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return contentBody;
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}
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let emojiBody = false;
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if (!opts.disableBigEmoji && bodyHasEmoji) {
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let contentBodyTrimmed = contentBody !== undefined ? contentBody.trim() : '';
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// Ignore spaces in body text. Emojis with spaces in between should
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// still be counted as purely emoji messages.
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contentBodyTrimmed = contentBodyTrimmed.replace(WHITESPACE_REGEX, '');
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// Remove zero width joiner characters from emoji messages. This ensures
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// that emojis that are made up of multiple unicode characters are still
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// presented as large.
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contentBodyTrimmed = contentBodyTrimmed.replace(ZWJ_REGEX, '');
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const match = BIGEMOJI_REGEX.exec(contentBodyTrimmed);
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emojiBody = match && match[0] && match[0].length === contentBodyTrimmed.length &&
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// Prevent user pills expanding for users with only emoji in
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// their username. Permalinks (links in pills) can be any URL
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// now, so we just check for an HTTP-looking thing.
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(
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strippedBody === safeBody || // replies have the html fallbacks, account for that here
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content.formatted_body === undefined ||
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(!content.formatted_body.includes("http:") &&
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!content.formatted_body.includes("https:"))
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);
|
|
}
|
|
|
|
const className = classNames({
|
|
'mx_EventTile_body': true,
|
|
'mx_EventTile_bigEmoji': emojiBody,
|
|
'markdown-body': isHtmlMessage && !emojiBody,
|
|
});
|
|
|
|
return isDisplayedWithHtml ?
|
|
<span
|
|
key="body"
|
|
ref={opts.ref}
|
|
className={className}
|
|
dangerouslySetInnerHTML={{ __html: safeBody }}
|
|
dir="auto"
|
|
/> : <span key="body" ref={opts.ref} className={className} dir="auto">{ strippedBody }</span>;
|
|
}
|
|
|
|
/**
|
|
* Linkifies the given string. This is a wrapper around 'linkifyjs/string'.
|
|
*
|
|
* @param {string} str string to linkify
|
|
* @param {object} [options] Options for linkifyString. Default: linkifyMatrix.options
|
|
* @returns {string} Linkified string
|
|
*/
|
|
export function linkifyString(str: string, options = linkifyMatrix.options) {
|
|
return _linkifyString(str, options);
|
|
}
|
|
|
|
/**
|
|
* 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: HTMLElement, 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
|
|
* @param {object} [options] Options for linkifyString. Default: linkifyMatrix.options
|
|
* @returns {string}
|
|
*/
|
|
export function linkifyAndSanitizeHtml(dirtyHtml: string, options = linkifyMatrix.options) {
|
|
return sanitizeHtml(linkifyString(dirtyHtml, options), sanitizeHtmlParams);
|
|
}
|
|
|
|
/**
|
|
* Returns if a node is a block element or not.
|
|
* Only takes html nodes into account that are allowed in matrix messages.
|
|
*
|
|
* @param {Node} node
|
|
* @returns {bool}
|
|
*/
|
|
export function checkBlockNode(node: Node) {
|
|
switch (node.nodeName) {
|
|
case "H1":
|
|
case "H2":
|
|
case "H3":
|
|
case "H4":
|
|
case "H5":
|
|
case "H6":
|
|
case "PRE":
|
|
case "BLOCKQUOTE":
|
|
case "P":
|
|
case "UL":
|
|
case "OL":
|
|
case "LI":
|
|
case "HR":
|
|
case "TABLE":
|
|
case "THEAD":
|
|
case "TBODY":
|
|
case "TR":
|
|
case "TH":
|
|
case "TD":
|
|
return true;
|
|
case "DIV":
|
|
// don't treat math nodes as block nodes for deserializing
|
|
return !(node as HTMLElement).hasAttribute("data-mx-maths");
|
|
default:
|
|
return false;
|
|
}
|
|
}
|