130 lines
6.4 KiB
TypeScript
130 lines
6.4 KiB
TypeScript
/*
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Copyright 2019 - 2021 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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/*
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* Based on...
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* ChromaCheck 1.16
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* author Roel Nieskens, https://pixelambacht.nl
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* MIT license
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*/
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import { logger } from "matrix-js-sdk/src/logger";
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function safariVersionCheck(ua: string): boolean {
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logger.log("Browser is Safari - checking version for COLR support");
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try {
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const safariVersionMatch = ua.match(/Mac OS X ([\d|_]+).*Version\/([\d|.]+).*Safari/);
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if (safariVersionMatch) {
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const macOSVersionStr = safariVersionMatch[1];
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const safariVersionStr = safariVersionMatch[2];
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const macOSVersion = macOSVersionStr.split("_").map((n) => parseInt(n, 10));
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const safariVersion = safariVersionStr.split(".").map((n) => parseInt(n, 10));
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const colrFontSupported =
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macOSVersion[0] >= 10 && macOSVersion[1] >= 14 && safariVersion[0] >= 12 && safariVersion[0] < 17;
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// https://www.colorfonts.wtf/ states Safari supports COLR fonts from this version on but Safari 17 breaks it
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logger.log(
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`COLR support on Safari requires macOS 10.14 and Safari 12-16, ` +
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`detected Safari ${safariVersionStr} on macOS ${macOSVersionStr}, ` +
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`COLR supported: ${colrFontSupported}`,
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);
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return colrFontSupported;
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}
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} catch (err) {
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logger.error("Error in Safari COLR version check", err);
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}
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logger.warn("Couldn't determine Safari version to check COLR font support, assuming no.");
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return false;
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}
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async function isColrFontSupported(): Promise<boolean> {
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logger.log("Checking for COLR support");
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const { userAgent } = navigator;
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// Firefox has supported COLR fonts since version 26
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// but doesn't support the check below without
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// "Extract canvas data" permissions
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// when content blocking is enabled.
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if (userAgent.includes("Firefox")) {
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logger.log("Browser is Firefox - assuming COLR is supported");
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return true;
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}
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// Safari doesn't wait for the font to load (if it doesn't have it in cache)
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// to emit the load event on the image, so there is no way to not make the check
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// reliable. Instead sniff the version.
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// Excluding "Chrome", as it's user agent unhelpfully also contains Safari...
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if (!userAgent.includes("Chrome") && userAgent.includes("Safari")) {
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return safariVersionCheck(userAgent);
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}
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try {
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d")!;
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const img = new Image();
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// eslint-disable-next-line
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const fontCOLR =
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"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";
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const svg = `
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<svg xmlns="http://www.w3.org/2000/svg" width="20" height="100" style="background:#fff;fill:#000;">
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<style type="text/css">
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@font-face {
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font-family: "chromacheck-colr";
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src: url(data:application/x-font-woff;base64,${fontCOLR}) format("woff");
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}
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</style>
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<text x="0" y="0" font-size="20">
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<tspan font-family="chromacheck-colr" x="0" dy="20"></tspan>
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</text>
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</svg>`;
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canvas.width = 20;
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canvas.height = 100;
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img.src = "data:image/svg+xml;charset=utf-8," + encodeURIComponent(svg);
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logger.log("Waiting for COLR SVG to load");
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await new Promise((resolve) => (img.onload = resolve));
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logger.log("Drawing canvas to detect COLR support");
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context.drawImage(img, 0, 0);
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const colrFontSupported = context.getImageData(10, 10, 1, 1).data[0] === 200;
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logger.log("Canvas check revealed COLR is supported? " + colrFontSupported);
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return colrFontSupported;
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} catch (e) {
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logger.error("Couldn't load COLR font", e);
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return false;
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}
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}
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let colrFontCheckStarted = false;
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export async function fixupColorFonts(): Promise<void> {
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if (colrFontCheckStarted) {
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return;
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}
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colrFontCheckStarted = true;
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if (await isColrFontSupported()) {
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const path = `url('${require("../../res/fonts/Twemoji_Mozilla/TwemojiMozilla-colr.woff2")}')`;
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document.fonts.add(new FontFace("Twemoji", path, {}));
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// For at least Chrome on Windows 10, we have to explictly add extra
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// weights for the emoji to appear in bold messages, etc.
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document.fonts.add(new FontFace("Twemoji", path, { weight: "600" }));
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document.fonts.add(new FontFace("Twemoji", path, { weight: "700" }));
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} else {
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// fall back to SBIX, generated via https://github.com/matrix-org/twemoji-colr/tree/matthew/sbix
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const path = `url('${require("../../res/fonts/Twemoji_Mozilla/TwemojiMozilla-sbix.woff2")}')`;
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document.fonts.add(new FontFace("Twemoji", path, {}));
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document.fonts.add(new FontFace("Twemoji", path, { weight: "600" }));
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document.fonts.add(new FontFace("Twemoji", path, { weight: "700" }));
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}
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// ...and if SBIX is not supported, the browser will fall back to one of the native fonts specified.
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}
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