Merge pull request #408 from vector-im/formatted-messages

Formatted messages

package.json

@@ -29,6 +29,7 @@
     "@babel/preset-env": "^7.11.0",
     "@rollup/plugin-babel": "^5.1.0",
     "@rollup/plugin-commonjs": "^15.0.0",
+    "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-multi-entry": "^4.0.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "autoprefixer": "^10.2.6",
@@ -40,6 +41,7 @@
     "finalhandler": "^1.1.1",
     "impunity": "^1.0.0",
     "mdn-polyfills": "^5.20.0",
+    "node-html-parser": "^4.0.0",
     "postcss": "^8.1.1",
     "postcss-css-variables": "^0.17.0",
     "postcss-flexbugs-fixes": "^4.2.1",
@@ -52,12 +54,13 @@
     "xxhashjs": "^0.2.2"
   },
   "dependencies": {
+    "@matrix-org/olm": "https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.3.tgz",
     "aes-js": "^3.1.2",
     "another-json": "^0.2.0",
     "base64-arraybuffer": "^0.2.0",
     "bs58": "^4.0.1",
+    "dompurify": "^2.3.0",
     "es6-promise": "https://github.com/bwindels/es6-promise.git#bwindels/expose-flush",
-    "@matrix-org/olm": "https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.3.tgz",
     "text-encoding": "^0.7.0"
   }
 }

scripts/post-install.js

@@ -22,6 +22,7 @@ const { fileURLToPath } = require('url');
 const { dirname } = require('path');
 // needed to translate commonjs modules to esm
 const commonjs = require('@rollup/plugin-commonjs');
+const json = require('@rollup/plugin-json');
 const { nodeResolve } = require('@rollup/plugin-node-resolve');
 
 const projectDir = path.join(__dirname, "../");
@@ -53,7 +54,7 @@ async function commonjsToESM(src, dst) {
     const bundle = await rollup({
         treeshake: {moduleSideEffects: false},
         input: src,
-        plugins: [commonjs(), nodeResolve({
+        plugins: [commonjs(), json(), nodeResolve({
             browser: true,
             preferBuiltins: false,
             customResolveOptions: {packageIterator}
@@ -76,6 +77,18 @@ async function populateLib() {
     for (const file of ["olm.js", "olm.wasm", "olm_legacy.js"]) {
         await fs.symlink(path.join(olmSrcDir, file), path.join(olmDstDir, file));
     }
+    // transpile node-html-parser to esm
+    await fs.mkdir(path.join(libDir, "node-html-parser/"));
+    await commonjsToESM(
+        require.resolve('node-html-parser/dist/index.js'),
+        path.join(libDir, "node-html-parser/index.js")
+    );
+    // Symlink dompurify
+    await fs.mkdir(path.join(libDir, "dompurify/"));
+    await fs.symlink(
+        require.resolve('dompurify/dist/purify.es.js'),
+        path.join(libDir, "dompurify/index.js")
+    );
     // transpile another-json to esm
     await fs.mkdir(path.join(libDir, "another-json/"));
     await commonjsToESM(

src/domain/session/room/timeline/FORMATTED.md

@@ -0,0 +1,25 @@
+# Ideas for formatted messages
+
+* Seems like a good idea to take some
+  inspiration from [Pandoc's AST](https://hackage.haskell.org/package/pandoc-types-1.22/docs/Text-Pandoc-Definition.html#t:Block).
+  Then, much like Pandoc AST, we can turn our representation into
+  markdown in the editor, or HTML in the view.
+  * This is good for both serialization and deserialization.
+    We can use the representation when going input -> formatted
+    message, which would allow other, non-web platforms
+    to rely on non-Markdown input types. We can also
+    use it going formatted message -> display, since a frontend
+    can then choose to use non-HTML output (GTK JS bindings?).
+* As such, we represent formatting by nesting parts
+  (we'd have a `ItalicsPart`, `BoldPart`, etc.)
+* We keep the "inline"/"block" distinction, but only
+  track it as a property, so that we can avoid adding
+  block parts to elements that cannot contain blocks
+  (headers, for instance, cannot contain blocks, but
+  lists -- themselves blocks -- can).
+* When parsing, we may need some sort of "permanent" context:
+  if we're parsing a header, and we are inside 3 layers of other
+  "inline" things (italics, strikethrough, and bold, for example),
+  and we encounter a block, that's still not valid.
+  * Element seems to not care at all about the validity of what
+    it's parsing. Do we assume the HTML is well-formatted, then?

src/domain/session/room/timeline/MessageBody.js

@@ -1,4 +1,5 @@
 import { linkify } from "./linkify/linkify.js";
+import { getIdentifierColorNumber, avatarInitials } from "../../../avatar.js";
 
 /**
  * Parse text into parts such as newline, links and text.
@@ -12,7 +13,7 @@ export function parsePlainBody(body) {
     // create callback outside of loop
     const linkifyCallback = (text, isLink) => {
         if (isLink) {
-            parts.push(new LinkPart(text, text));
+            parts.push(new LinkPart(text, [new TextPart(text)]));
         } else {
             parts.push(new TextPart(text));
         }
@@ -36,20 +37,99 @@ export function stringAsBody(body) {
     return new MessageBody(body, [new TextPart(body)]);
 }
 
-class NewLinePart {
+export class HeaderBlock {
+    constructor(level, inlines) {
+        this.level = level;
+        this.inlines = inlines;
+    }
+
+    get type() { return "header"; }
+}
+
+export class CodeBlock {
+    constructor(language, text) {
+        this.language = language;
+        this.text = text;
+    }
+
+    get type() { return "codeblock"; }
+}
+
+export class ListBlock {
+    constructor(startOffset, items) {
+        this.items = items;
+        this.startOffset = startOffset;
+    }
+
+    get type() { return "list"; }
+}
+
+export class TableBlock {
+    constructor(head, body) {
+        this.head = head;
+        this.body = body;
+    }
+
+    get type() { return "table"; }
+}
+
+export class RulePart {
+    get type( ) { return "rule"; }
+}
+
+export class NewLinePart {
     get type() { return "newline"; }
 }
 
-class LinkPart {
+export class FormatPart {
-    constructor(url, text) {
+    constructor(format, children) {
+        this.format = format.toLowerCase();
+        this.children = children;
+    }
+
+    get type() { return "format"; }
+}
+
+export class ImagePart {
+    constructor(src, width, height, alt, title) {
+        this.src = src;
+        this.width = width;
+        this.height = height;
+        this.alt = alt;
+        this.title = title;
+    }
+
+    get type() { return "image"; }
+}
+
+export class PillPart {
+    constructor(id, href, children) {
+        this.id = id;
+        this.href = href;
+        this.children = children;
+    }
+
+    get type() { return "pill"; }
+
+    get avatarColorNumber() {
+        return getIdentifierColorNumber(this.id);
+    }
+
+    get avatarInitials() {
+        return avatarInitials(this.id);
+    }
+}
+
+export class LinkPart {
+    constructor(url, inlines) {
         this.url = url;
-        this.text = text;
+        this.inlines = inlines;
     }
 
     get type() { return "link"; }
 }
 
-class TextPart {
+export class TextPart {
     constructor(text) {
         this.text = text;
     }
@@ -57,7 +137,7 @@ class TextPart {
     get type() { return "text"; }
 }
 
-class MessageBody {
+export class MessageBody {
     constructor(sourceString, parts) {
         this.sourceString = sourceString;
         this.parts = parts;

src/domain/session/room/timeline/deserialize.js

@@ -0,0 +1,501 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { MessageBody, HeaderBlock, TableBlock, ListBlock, CodeBlock, PillPart, FormatPart, NewLinePart, RulePart, TextPart, LinkPart, ImagePart } from "./MessageBody.js"
+import { linkify } from "./linkify/linkify.js";
+
+/* At the time of writing (Jul 1 2021), Matrix Spec recommends
+ * allowing the following HTML tags:
+ *     font, del, h1, h2, h3, h4, h5, h6, blockquote, p, a, ul, ol, sup, sub, li, b, i, u,
+ *     strong, em, strike, code, hr, br, div, table, thead, tbody, tr, th, td, caption, pre, span, img
+ */
+
+/**
+ * Nodes that don't have any properties to them other than their tag.
+ * While <a> has `href`, and <img> has `src`, these have... themselves.
+ */
+const basicInline = ["EM", "STRONG", "CODE", "DEL", "SPAN" ];
+const basicBlock = ["DIV", "BLOCKQUOTE"];
+const safeSchemas = ["https", "http", "ftp", "mailto", "magnet"].map(name => `${name}://`);
+const baseUrl = 'https://matrix.to';
+const linkPrefix = `${baseUrl}/#/`;
+
+class Deserializer {
+    constructor(result, mediaRepository) {
+        this.result = result;
+        this.mediaRepository = mediaRepository;
+    }
+
+    parsePillLink(link) {
+        if (!link.startsWith(linkPrefix)) {
+            return null;
+        }
+        const contents = link.substring(linkPrefix.length);
+        if (contents[0] === '@') {
+            return contents;
+        }
+        return null;
+    }
+
+    parseLink(node, children) {
+        const href = this.result.getAttributeValue(node, "href");
+        const lcUrl = href?.toLowerCase();
+        // urls should be absolute and with a safe schema, as listed in the spec
+        if (!lcUrl || !safeSchemas.some(schema => lcUrl.startsWith(schema))) {
+            return new FormatPart("span", children);
+        }
+        const pillId = this.parsePillLink(href);
+        if (pillId) {
+            return new PillPart(pillId, href, children);
+        }
+        return new LinkPart(href, children);
+    }
+
+    parseList(node) {
+        const result = this.result;
+        let start = null;
+        if (result.getNodeElementName(node) === "OL") {
+            // Will return 1 for, say, '1A', which may not be intended?
+            start = parseInt(result.getAttributeValue(node, "start")) || 1;
+        }
+        const items = [];
+        for (const child of result.getChildNodes(node)) {
+            if (result.getNodeElementName(child) !== "LI") {
+                continue;
+            }
+            const item = this.parseAnyNodes(result.getChildNodes(child));
+            items.push(item);
+        }
+        return new ListBlock(start, items);
+    }
+
+    _ensureElement(node, tag) {
+        return node &&
+            this.result.isElementNode(node) &&
+            this.result.getNodeElementName(node) === tag;
+    }
+
+    parseCodeBlock(node) {
+        const result = this.result;
+        let codeNode;
+        for (const child of result.getChildNodes(node)) {
+            codeNode = child;
+            break;
+        }
+        let language = null;
+        if (!this._ensureElement(codeNode, "CODE")) {
+            return new CodeBlock(language, this.result.getNodeText(node));
+        }
+        const cl = result.getAttributeValue(codeNode, "class") || ""
+        for (const clname of cl.split(" ")) {
+            if (clname.startsWith("language-") && !clname.startsWith("language-_")) {
+                language = clname.substring(9) // "language-".length
+                break;
+            }
+        }
+        return new CodeBlock(language, this.result.getNodeText(codeNode));
+    }
+
+    parseImage(node) {
+        const result = this.result;
+        const src = result.getAttributeValue(node, "src") || "";
+        const url = this.mediaRepository.mxcUrl(src);
+        // We just ignore non-mxc `src` attributes.
+        if (!url) {
+            return null;
+        }
+        const width = parseInt(result.getAttributeValue(node, "width")) || null;
+        const height = parseInt(result.getAttributeValue(node, "height")) || null;
+        const alt = result.getAttributeValue(node, "alt");
+        const title = result.getAttributeValue(node, "title");
+        return new ImagePart(url, width, height, alt, title);
+    }
+
+    parseTableRow(row, tag) {
+        const cells = [];
+        for (const node of this.result.getChildNodes(row)) {
+            if(!this._ensureElement(node, tag)) {
+                continue;
+            }
+            const children = this.result.getChildNodes(node);
+            const inlines = this.parseInlineNodes(children);
+            cells.push(inlines);
+        }
+        return cells;
+    }
+
+    parseTableHead(head) {
+        let headRow = null;
+        for (const node of this.result.getChildNodes(head)) {
+            headRow = node;
+            break;
+        }
+        if (this._ensureElement(headRow, "TR")) {
+            return this.parseTableRow(headRow, "TH");
+        }
+        return null;
+    }
+
+    parseTableBody(body) {
+        const rows = [];
+        for (const node of this.result.getChildNodes(body)) {
+            if(!this._ensureElement(node, "TR")) {
+                continue;
+            }
+            rows.push(this.parseTableRow(node, "TD"));
+        }
+        return rows;
+    }
+
+    parseTable(node) {
+        // We are only assuming iterable, so convert to arrary for indexing.
+        const children = Array.from(this.result.getChildNodes(node));
+        let head, body;
+        if (this._ensureElement(children[0], "THEAD") && this._ensureElement(children[1], "TBODY")) {
+            head = this.parseTableHead(children[0]);
+            body = this.parseTableBody(children[1]);
+        } else if (this._ensureElement(children[0], "TBODY")) {
+            head = null;
+            body = this.parseTableBody(children[0]);
+        }
+        return new TableBlock(head, body);
+    }
+
+    /** Once a node is known to be an element,
+     * attempt to interpret it as an inline element.
+     *
+     * @returns the inline message part, or null if the element
+     *   is not inline or not allowed.
+     */
+    parseInlineElement(node) {
+        const result = this.result;
+        const tag = result.getNodeElementName(node);
+        const children = result.getChildNodes(node);
+        switch (tag) {
+            case "A": {
+                const inlines = this.parseInlineNodes(children);
+                return this.parseLink(node, inlines);
+            }
+            case "BR":
+                return new NewLinePart();
+            default: {
+                if (!basicInline.includes(tag)) {
+                    return null;
+                }
+                const inlines = this.parseInlineNodes(children);
+                return new FormatPart(tag, inlines);
+            }
+        }
+    }
+
+    /** Attempt to interpret a node as inline.
+     *
+     * @returns the inline message part, or null if the
+     *   element is not inline or not allowed.
+     */
+    parseInlineNode(node) {
+        if (this.result.isElementNode(node)) {
+            return this.parseInlineElement(node);
+        }
+        return null;
+    }
+
+    /** Once a node is known to be an element, attempt
+     * to interpret it as a block element.
+     *
+     * @returns the block message part, or null of the
+     *   element is not a block or not allowed.
+     */
+    parseBlockElement(node) {
+        const result = this.result;
+        const tag = result.getNodeElementName(node);
+        const children = result.getChildNodes(node);
+        switch (tag) {
+            case "H1":
+            case "H2":
+            case "H3":
+            case "H4":
+            case "H5":
+            case "H6": {
+                const inlines = this.parseInlineNodes(children);
+                return new HeaderBlock(parseInt(tag[1]), inlines)
+            }
+            case "UL":
+            case "OL":
+                return this.parseList(node);
+            case "PRE":
+                return this.parseCodeBlock(node);
+            case "HR":
+                return new RulePart();
+            case "IMG":
+                return this.parseImage(node);
+            case "P": {
+                const inlines = this.parseInlineNodes(children);
+                return new FormatPart(tag, inlines);
+            }
+            case "TABLE":
+                return this.parseTable(node);
+            default: {
+                if (!basicBlock.includes(tag)) {
+                    return null;
+                }
+                const blocks = this.parseAnyNodes(children);
+                return new FormatPart(tag, blocks);
+            }
+        }
+    }
+
+    /** Attempt to parse a node as a block.
+     *
+     * @return the block message part, or null if the node
+     *   is not a block element.
+     */
+    parseBlockNode(node) {
+        if (this.result.isElementNode(node)) {
+            return this.parseBlockElement(node);
+        }
+        return null;
+    }
+
+    _parseTextParts(node, into) {
+        if(!this.result.isTextNode(node)) {
+            return false;
+        }
+
+        // XXX pretty much identical to `MessageBody`'s.
+        const linkifyCallback = (text, isLink) => {
+            if (isLink) {
+                into.push(new LinkPart(text, [new TextPart(text)]));
+            } else {
+                into.push(new TextPart(text));
+            }
+        };
+        linkify(this.result.getNodeText(node), linkifyCallback);
+        return true;
+    }
+
+    _parseInlineNodes(nodes, into) {
+        for (const htmlNode of nodes) {
+            if (this._parseTextParts(htmlNode, into)) {
+                // This was a text node, and we already
+                // dumped its parts into our list.
+                continue;
+            }
+            const node = this.parseInlineNode(htmlNode);
+            if (node) {
+                into.push(node);
+                continue;
+            }
+            // Node is either block or unrecognized. In
+            // both cases, just move on to its children.
+            this._parseInlineNodes(this.result.getChildNodes(htmlNode), into);
+        }
+    }
+
+    parseInlineNodes(nodes) {
+        const into = [];
+        this._parseInlineNodes(nodes, into);
+        return into;
+    }
+
+    // XXX very similar to `_parseInlineNodes`.
+    _parseAnyNodes(nodes, into) {
+        for (const htmlNode of nodes) {
+            if (this._parseTextParts(htmlNode, into)) {
+                // This was a text node, and we already
+                // dumped its parts into our list.
+                continue;
+            }
+            const node = this.parseInlineNode(htmlNode) || this.parseBlockNode(htmlNode);
+            if (node) {
+                into.push(node);
+                continue;
+            }
+            // Node is unrecognized. Just move on to its children.
+            this._parseAnyNodes(this.result.getChildNodes(htmlNode), into);
+        }
+    }
+
+    parseAnyNodes(nodes) {
+        const into = [];
+        this._parseAnyNodes(nodes, into);
+        return into;
+    }
+}
+
+export function parseHTMLBody(platform, mediaRepository, html) {
+    const parseResult = platform.parseHTML(html);
+    const deserializer = new Deserializer(parseResult, mediaRepository);
+    const parts = deserializer.parseAnyNodes(parseResult.rootNodes);
+    return new MessageBody(html, parts);
+}
+
+import parse from '../../../../../lib/node-html-parser/index.js';
+
+export function tests() {
+    class HTMLParseResult {
+        constructor(bodyNode) {
+            this._bodyNode = bodyNode;
+        }
+
+        get rootNodes() {
+            return this._bodyNode.childNodes;
+        }
+
+        getChildNodes(node) {
+            return node.childNodes;
+        }
+
+        getAttributeNames(node) {
+            return node.getAttributeNames();
+        }
+
+        getAttributeValue(node, attr) {
+            return node.getAttribute(attr);
+        }
+
+        isTextNode(node) {
+            return !node.tagName;
+        }
+
+        getNodeText(node) {
+            return node.text;
+        }
+
+        isElementNode(node) {
+            return !!node.tagName;
+        }
+
+        getNodeElementName(node) {
+            return node.tagName;
+        }
+    }
+
+    const platform = {
+        parseHTML: (html) => new HTMLParseResult(parse(html))
+    };
+
+    function test(assert, input, output) {
+        assert.deepEqual(parseHTMLBody(platform, null, input), new MessageBody(input, output));
+    }
+
+    return {
+        "Text only": assert => {
+            const input = "This is a sentence";
+            const output = [new TextPart(input)];
+            test(assert, input, output);
+        },
+        "Text with inline code format": assert => {
+            const input = "Here's <em>some</em> <code>code</code>!";
+            const output = [
+                new TextPart("Here's "),
+                new FormatPart("em", [new TextPart("some")]),
+                new TextPart(" "),
+                new FormatPart("code", [new TextPart("code")]),
+                new TextPart("!")
+            ];
+            test(assert, input, output);
+        },
+        "Text with ordered list with no attributes": assert => {
+            const input = "<ol><li>Lorem</li><li>Ipsum</li></ol>";
+            const output = [
+                new ListBlock(1, [
+                    [ new TextPart("Lorem") ],
+                    [ new TextPart("Ipsum") ]
+                ])
+            ];
+            test(assert, input, output);
+        },
+        "Text with ordered list starting at 3": assert => {
+            const input = '<ol start="3"><li>Lorem</li><li>Ipsum</li></ol>';
+            const output = [
+                new ListBlock(3, [
+                    [ new TextPart("Lorem") ],
+                    [ new TextPart("Ipsum") ]
+                ])
+            ];
+            test(assert, input, output);
+        },
+        "Text with unordered list": assert => {
+            const input = '<ul start="3"><li>Lorem</li><li>Ipsum</li></ul>';
+            const output = [
+                new ListBlock(null, [
+                    [ new TextPart("Lorem") ],
+                    [ new TextPart("Ipsum") ]
+                ])
+            ];
+            test(assert, input, output);
+        },
+        "Auto-closed tags": assert => {
+            const input = '<p>hello<p>world</p></p>';
+            const output = [
+                new FormatPart("p", [new TextPart("hello")]),
+                new FormatPart("p", [new TextPart("world")])
+            ];
+            test(assert, input, output);
+        },
+        "Block elements ignored inside inline elements": assert => {
+            const input = '<span><p><code>Hello</code></p></span>';
+            const output = [
+                new FormatPart("span", [new FormatPart("code", [new TextPart("Hello")])])
+            ];
+            test(assert, input, output);
+        },
+        "Unknown tags are ignored, but their children are kept": assert => {
+            const input = '<span><dfn><code>Hello</code></dfn><footer><em>World</em></footer></span>';
+            const output = [
+                new FormatPart("span", [
+                    new FormatPart("code", [new TextPart("Hello")]),
+                    new FormatPart("em", [new TextPart("World")])
+                ])
+            ];
+            test(assert, input, output);
+        },
+        "Unknown and invalid attributes are stripped": assert => {
+            const input = '<em onmouseover=alert("Bad code!")>Hello</em>';
+            const output = [
+                new FormatPart("em", [new TextPart("Hello")])
+            ];
+            test(assert, input, output);
+        },
+        "Text with code block but no <code> tag": assert => {
+            const code = 'main :: IO ()\nmain = putStrLn "Hello"'
+            const input = `<pre>${code}</pre>`;
+            const output = [
+                new CodeBlock(null, code)
+            ];
+            test(assert, input, output);
+        },
+        "Text with code block and 'unsupported' tag": assert => {
+            const code = '<em>Hello, world</em>'
+            const input = `<pre>${code}</pre>`;
+            const output = [
+                new CodeBlock(null, code)
+            ];
+            test(assert, input, output);
+        }
+        /* Doesnt work: HTML library doesn't handle <pre><code> properly.
+        "Text with code block": assert => {
+            const code = 'main :: IO ()\nmain = putStrLn "Hello"'
+            const input = `<pre><code>${code}</code></pre>`;
+            const output = [
+                new CodeBlock(null, code)
+            ];
+            test(assert, input, output);
+        }
+        */
+    };
+}

src/domain/session/room/timeline/tiles/BaseTextTile.js

@@ -16,31 +16,43 @@ limitations under the License.
 
 import {BaseMessageTile} from "./BaseMessageTile.js";
 import {stringAsBody} from "../MessageBody.js";
+import {createEnum} from "../../../../../utils/enum.js";
+
+export const BodyFormat = createEnum("Plain", "Html");
 
 export class BaseTextTile extends BaseMessageTile {
     constructor(options) {
         super(options);
         this._messageBody = null;
+        this._format = null
     }
 
     get shape() {
         return "message";
     }
 
-    _parseBody(bodyString) {
+    _parseBody(body) {
-        return stringAsBody(bodyString);
+        return stringAsBody(body);
+    }
+
+    _getBodyFormat() {
+        return BodyFormat.Plain;
     }
 
     get body() {
-        const body = this._getBodyAsString();
+        const body = this._getBody();
+        const format = this._getBodyFormat();
         // body is a string, so we can check for difference by just
         // doing an equality check
-        if (!this._messageBody || this._messageBody.sourceString !== body) {
+        // Even if the body hasn't changed, but the format has, we need
+        // to re-fill our cache.
+        if (!this._messageBody || this._messageBody.sourceString !== body || this._format !== format) {
             // body with markup is an array of parts,
             // so we should not recreate it for the same body string,
             // or else the equality check in the binding will always fail.
             // So cache it here.
-            this._messageBody = this._parseBody(body);
+            this._messageBody = this._parseBody(body, format);
+            this._format = format;
         }
         return this._messageBody;
     }

src/domain/session/room/timeline/tiles/EncryptedEventTile.js

@@ -33,13 +33,15 @@ export class EncryptedEventTile extends BaseTextTile {
         return "message-status"
     }
 
-    _getBodyAsString() {
+    _getBody() {
         const decryptionError = this._entry.decryptionError;
         const code = decryptionError?.code;
+        let string;
         if (code === "MEGOLM_NO_SESSION") {
-            return this.i18n`The sender hasn't sent us the key for this message yet.`;
+            string = this.i18n`The sender hasn't sent us the key for this message yet.`;
         } else {
-            return decryptionError?.message || this.i18n`Could not decrypt message because of unknown reason.`;
+            string = decryptionError?.message || this.i18n`Could not decrypt message because of unknown reason.`;
-        }
+        }
+        return string;
     }
 }

src/domain/session/room/timeline/tiles/TextTile.js

@@ -14,20 +14,49 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {BaseTextTile} from "./BaseTextTile.js";
+import {BaseTextTile, BodyFormat} from "./BaseTextTile.js";
 import {parsePlainBody} from "../MessageBody.js";
+import {parseHTMLBody} from "../deserialize.js";
 
 export class TextTile extends BaseTextTile {
-    _getBodyAsString() {
+    _getContentString(key) {
         const content = this._getContent();
-        let body = content?.body || "";
+        let val = content?.[key] || "";
         if (content.msgtype === "m.emote") {
-            body = `* ${this.displayName} ${body}`;
+            val = `* ${this.displayName} ${val}`;
         }
-        return body;
+        return val;
     }
 
-    _parseBody(bodyString) {
+    _getPlainBody() {
-        return parsePlainBody(bodyString);
+        return this._getContentString("body");
+    }
+
+    _getFormattedBody() {
+        return this._getContentString("formatted_body");
+    }
+
+    _getBody() {
+        if (this._getBodyFormat() === BodyFormat.Html) {
+            return this._getFormattedBody();
+        } else {
+            return this._getPlainBody();
+        }
+    }
+
+    _getBodyFormat() {
+        if (this._getContent()?.format === "org.matrix.custom.html") {
+            return BodyFormat.Html;
+        } else {
+            return BodyFormat.Plain;
+        }
+    }
+
+    _parseBody(body, format) {
+        if (format === BodyFormat.Html) {
+            return parseHTMLBody(this.platform, this._mediaRepository, body);
+        } else {
+            return parsePlainBody(body);
+        }
     }
 }

src/platform/web/Platform.js

@@ -36,6 +36,7 @@ import {BlobHandle} from "./dom/BlobHandle.js";
 import {hasReadPixelPermission, ImageHandle, VideoHandle} from "./dom/ImageHandle.js";
 import {downloadInIframe} from "./dom/download.js";
 import {Disposables} from "../../utils/Disposables.js";
+import {parseHTML} from "./parsehtml.js";
 import {handleAvatarError} from "./ui/avatar.js";
 
 function addScript(src) {
@@ -239,6 +240,10 @@ export class Platform {
         return promise;
     }
 
+    parseHTML(html) {
+        return parseHTML(html);
+    }
+
     async loadImage(blob) {
         return ImageHandle.fromBlob(blob);
     }

src/platform/web/parsehtml.js

@@ -0,0 +1,67 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import DOMPurify from "../../../../../lib/dompurify/index.js"
+
+class HTMLParseResult {
+    constructor(bodyNode) {
+        this._bodyNode = bodyNode;
+    }
+
+    get rootNodes() {
+        return Array.from(this._bodyNode.childNodes);
+    }
+    
+    getChildNodes(node) {
+        return Array.from(node.childNodes);
+    }
+
+    getAttributeNames(node) {
+        return Array.from(node.getAttributeNames());
+    }
+
+    getAttributeValue(node, attr) {
+        return node.getAttribute(attr);
+    }
+
+    isTextNode(node) { 
+        return node.nodeType === Node.TEXT_NODE;
+    }
+
+    getNodeText(node) {
+        return node.textContent;
+    }
+
+    isElementNode(node) {
+        return node.nodeType === Node.ELEMENT_NODE;
+    }
+
+    getNodeElementName(node) {
+        return node.tagName;
+    }
+}
+
+const sanitizeConfig = {
+    ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp|xxx|mxc):|[^a-z]|[a-z+.-]+(?:[^a-z+.-:]|$))/i,
+}
+
+export function parseHTML(html) {
+    // If DOMPurify uses DOMParser, can't we just get the built tree from it
+    // instead of re-parsing?
+    const sanitized = DOMPurify.sanitize(html, sanitizeConfig);
+    const bodyNode = new DOMParser().parseFromString(sanitized, "text/html").body;
+    return new HTMLParseResult(bodyNode);
+}

src/platform/web/ui/css/avatar.css

@@ -76,3 +76,11 @@ limitations under the License.
     line-height: var(--avatar-size);
     font-size: calc(var(--avatar-size) * 0.6);
 }
+
+.hydrogen .avatar.size-12 {
+    --avatar-size: 12px;
+    width: var(--avatar-size);
+    height: var(--avatar-size);
+    line-height: var(--avatar-size);
+    font-size: calc(var(--avatar-size) * 0.6);
+}

src/platform/web/ui/css/themes/element/timeline.css

@@ -126,6 +126,8 @@ limitations under the License.
     line-height: 2.2rem;
     /* so the .media can grow horizontally and its spacer can grow vertically */
     width: 100%;
+    /* Fix for pre overflow */
+    min-width: 0;
 }
 
 .hydrogen .Timeline_messageSender.usercolor1 { color: var(--usercolor1); }
@@ -137,10 +139,32 @@ limitations under the License.
 .hydrogen .Timeline_messageSender.usercolor7 { color: var(--usercolor7); }
 .hydrogen .Timeline_messageSender.usercolor8 { color: var(--usercolor8); }
 
+.Timeline_messageBody h1,
+.Timeline_messageBody h2,
+.Timeline_messageBody h3,
+.Timeline_messageBody h4,
+.Timeline_messageBody h5,
+.Timeline_messageBody h6 {
+    font-weight: bold;
+    margin: 0.7em 0;
+}
+
+.Timeline_messageBody h1 { font-size: 1.6em; }
+.Timeline_messageBody h2 { font-size: 1.5em; }
+.Timeline_messageBody h3 { font-size: 1.4em; }
+.Timeline_messageBody h4 { font-size: 1.3em; }
+.Timeline_messageBody h5 { font-size: 1.2em; }
+.Timeline_messageBody h6 { font-size: 1.1em; }
+
 .Timeline_messageBody a {
     word-break: break-all;
 }
 
+.Timeline_messageBody a.link {
+    color: #238cf5;
+    text-decoration: none;
+}
+
 .Timeline_messageBody .media {
     display: grid;
     margin-top: 4px;
@@ -209,6 +233,73 @@ only loads when the top comes into view*/
     /* don't stretch height as it is a spacer, just in case it doesn't match with image height */
     align-self: start;
 }
+.Timeline_messageBody code, .Timeline_messageBody pre {
+    background-color: #f8f8f8;
+    font-family: monospace;
+    font-size: 0.9em;
+}
+
+.Timeline_messageBody code {
+    border-radius: 3px;
+    padding: .2em .3em;
+    margin: 0;
+}
+
+.Timeline_messageBody pre {
+    border: 1px solid rgb(229, 229, 229);
+    padding: 0.5em;
+    max-height: 30em;
+    overflow: auto;
+}
+
+.Timeline_messageBody pre > code {
+    background-color: unset;
+    border-radius: unset;
+    display: block;
+    font-size: unset;
+}
+
+.Timeline_messageBody blockquote {
+    margin-left: 0;
+    padding-left: 20px;
+    border-left: 4px solid rgb(229, 229, 229);
+}
+
+.Timeline_messageBody table {
+    border: 1px solid rgb(206, 206, 206);
+    border-radius: 2px;
+    border-spacing: 0;
+}
+
+.Timeline_messageBody thead th {
+    border-bottom: 1px solid rgb(206, 206, 206);
+}
+
+.Timeline_messageBody td, .Timeline_messageBody th {
+    padding: 2px 5px 2px 5px;
+}
+
+.Timeline_messageBody tbody tr:nth-child(2n) {
+    background-color: #f6f6f6;
+}
+
+.Timeline_messageBody .pill {
+    padding: 0px 5px;
+    border-radius: 15px;
+    background-color: #f6f6f6;
+    border: 1px solid rgb(206, 206, 206);
+    text-decoration: none;
+    display: inline-flex;
+    align-items: center;
+    line-height: 2rem;
+    vertical-align: top;
+    margin: 1px;
+}
+
+.Timeline_messageBody .pill div.avatar {
+    display: inline-block;
+    margin-right: 3px;
+}
 
 .Timeline_message.unsent .Timeline_messageBody {
     color: #ccc;

src/platform/web/ui/css/timeline.css

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 
-.RoomView_body ul {
+.RoomView_body > ul {
     overflow-y: auto;
     overscroll-behavior: contain;
     list-style: none;
@@ -61,3 +61,8 @@ limitations under the License.
 .GapView > :nth-child(2) {
     flex: 1;
 }
+
+.Timeline_messageBody img {
+    max-width: 400px;
+    max-height: 300px;
+}

src/platform/web/ui/general/html.js

@@ -93,8 +93,9 @@ export const SVG_NS = "http://www.w3.org/2000/svg";
 export const TAG_NAMES = {
     [HTML_NS]: [
         "br", "a", "ol", "ul", "li", "div", "h1", "h2", "h3", "h4", "h5", "h6",
-        "p", "strong", "em", "span", "img", "section", "main", "article", "aside",
+        "p", "strong", "em", "span", "img", "section", "main", "article", "aside", "del", "blockquote",
-        "pre", "button", "time", "input", "textarea", "label", "form", "progress", "output", "video"],
+        "table", "thead", "tbody", "tr", "th", "td",
+        "pre", "code", "button", "time", "input", "textarea", "label", "form", "progress", "output", "video"],
     [SVG_NS]: ["svg", "circle"]
 };
 

src/platform/web/ui/session/room/timeline/TextMessageView.js

@@ -14,41 +14,99 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {StaticView} from "../../../general/StaticView.js";
 import {tag, text} from "../../../general/html.js";
 import {BaseMessageView} from "./BaseMessageView.js";
 
 export class TextMessageView extends BaseMessageView {
     renderMessageBody(t, vm) {
-        return t.p({
+        const time = t.time({className: {hidden: !vm.date}}, vm.date + " " + vm.time);
+        const container = t.div({
             className: {
                 "Timeline_messageBody": true,
                 statusMessage: vm => vm.shape === "message-status",
             },
-        }, [
+        });
-            t.mapView(vm => vm.body, body => new BodyView(body)),
+        t.mapSideEffect(vm => vm.body, body => {
-            t.time({className: {hidden: !vm.date}}, vm.date + " " + vm.time)
+            while (container.lastChild) {
-        ]);
+                container.removeChild(container.lastChild);
             }
+            for (const part of body.parts) {
+                container.appendChild(renderPart(part));
+            }
+            container.appendChild(time);
+        });
+        return container;
+    }
+}
+
+function renderList(listBlock) {
+    const items = listBlock.items.map(item => tag.li(renderParts(item)));
+    const start = listBlock.startOffset;
+    if (start) {
+        return tag.ol({ start }, items);
+    } else {
+        return tag.ul(items);
+    }
+}
+
+function renderImage(imagePart) {
+    const attributes = { src: imagePart.src };
+    if (imagePart.width) { attributes.width = imagePart.width }
+    if (imagePart.height) { attributes.height = imagePart.height }
+    if (imagePart.alt) { attributes.alt = imagePart.alt }
+    if (imagePart.title) { attributes.title = imagePart.title }
+    return tag.img(attributes);
+}
+
+function renderPill(pillPart) {
+    // The classes and structure are borrowed from avatar.js;
+    // We don't call renderStaticAvatar because that would require
+    // an intermediate object that has getAvatarUrl etc.
+    const classes = `avatar size-12 usercolor${pillPart.avatarColorNumber}`;
+    const avatar = tag.div({class: classes}, text(pillPart.avatarInitials));
+    const children = renderParts(pillPart.children);
+    children.unshift(avatar);
+    return tag.a({class: "pill", href: pillPart.href, rel: "noopener", target: "_blank"}, children);
+}
+
+function renderTable(tablePart) {
+    const children = [];
+    if (tablePart.head) {
+        const headers = tablePart.head
+            .map(cell => tag.th(renderParts(cell)));
+        children.push(tag.thead(tag.tr(headers)))
+    }
+    const rows = [];
+    for (const row of tablePart.body) {
+        const data = row.map(cell => tag.td(renderParts(cell)));
+        rows.push(tag.tr(data));
+    }
+    children.push(tag.tbody(rows));
+    return tag.table(children);
 }
 
 /**
  * Map from part to function that outputs DOM for the part
  */
 const formatFunction = {
+    header: headerBlock => tag["h" + Math.min(6,headerBlock.level)](renderParts(headerBlock.inlines)),
+    codeblock: codeBlock => tag.pre(tag.code(text(codeBlock.text))),
+    table: tableBlock => renderTable(tableBlock),
+    code: codePart => tag.code(text(codePart.text)),
     text: textPart => text(textPart.text),
-    link: linkPart => tag.a({ href: linkPart.url, target: "_blank", rel: "noopener" }, [linkPart.text]),
+    link: linkPart => tag.a({href: linkPart.url, className: "link", target: "_blank", rel: "noopener" }, renderParts(linkPart.inlines)),
+    pill: renderPill,
+    format: formatPart => tag[formatPart.format](renderParts(formatPart.children)),
+    list: renderList,
+    image: renderImage,
     newline: () => tag.br()
 };
 
-class BodyView extends StaticView {
+function renderPart(part) {
-    render(t, messageBody) {
-        const container = t.span();
-        for (const part of messageBody.parts) {
     const f = formatFunction[part.type];
-            const element = f(part);
+    return f(part);
-            container.appendChild(element);
-        }
-        return container;
 }
+
+function renderParts(parts) {
+    return Array.from(parts, renderPart);
 }

yarn.lock

@@ -886,6 +886,13 @@
     magic-string "^0.25.7"
     resolve "^1.17.0"
 
+"@rollup/plugin-json@^4.1.0":
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/@rollup/plugin-json/-/plugin-json-4.1.0.tgz#54e09867ae6963c593844d8bd7a9c718294496f3"
+  integrity sha512-yfLbTdNS6amI/2OpmbiBoW12vngr5NW2jCJVZSBEz+H5KfUJZ2M7sDjk0U6GOOdCWFVScShte29o9NezJ53TPw==
+  dependencies:
+    "@rollup/pluginutils" "^3.0.8"
+
 "@rollup/plugin-multi-entry@^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@rollup/plugin-multi-entry/-/plugin-multi-entry-4.0.0.tgz#8e105f16ec1bb26639eb3302c8db5665f44b9939"
@@ -911,7 +918,7 @@
   resolved "https://registry.yarnpkg.com/@rollup/plugin-virtual/-/plugin-virtual-2.0.3.tgz#0afc88d75c1e1378ab290b8e9898d4edb5be0d74"
   integrity sha512-pw6ziJcyjZtntQ//bkad9qXaBx665SgEL8C8KI5wO8G5iU5MPxvdWrQyVaAvjojGm9tJoS8M9Z/EEepbqieYmw==
 
-"@rollup/pluginutils@^3.1.0":
+"@rollup/pluginutils@^3.0.8", "@rollup/pluginutils@^3.1.0":
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/@rollup/pluginutils/-/pluginutils-3.1.0.tgz#706b4524ee6dc8b103b3c995533e5ad680c02b9b"
   integrity sha512-GksZ6pr6TpIjHm8h9lSQ8pi8BE9VeubNT0OMJ3B5uZJ8pz73NPiqOtCog/x2/QzM1ENChPKxMDhiQuRHsqc+lg==
@@ -1059,7 +1066,7 @@ base64-arraybuffer@^0.2.0:
   resolved "https://registry.yarnpkg.com/base64-arraybuffer/-/base64-arraybuffer-0.2.0.tgz#4b944fac0191aa5907afe2d8c999ccc57ce80f45"
   integrity sha512-7emyCsu1/xiBXgQZrscw/8KPRT44I4Yq9Pe6EGs3aPRTsWuggML1/1DTuZUuIaJPIm1FTDUVXl4x/yW8s0kQDQ==
 
-boolbase@~1.0.0:
+boolbase@^1.0.0, boolbase@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
   integrity sha1-aN/1++YMUes3cl6p4+0xDcwed24=
@@ -1237,6 +1244,17 @@ cross-spawn@^7.0.2:
     shebang-command "^2.0.0"
     which "^2.0.1"
 
+css-select@^4.1.3:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/css-select/-/css-select-4.1.3.tgz#a70440f70317f2669118ad74ff105e65849c7067"
+  integrity sha512-gT3wBNd9Nj49rAbmtFHj1cljIAOLYSX1nZ8CB7TBO3INYckygm5B7LISU/szY//YmdiSLbJvDLOx9VnMVpMBxA==
+  dependencies:
+    boolbase "^1.0.0"
+    css-what "^5.0.0"
+    domhandler "^4.2.0"
+    domutils "^2.6.0"
+    nth-check "^2.0.0"
+
 css-select@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/css-select/-/css-select-1.2.0.tgz#2b3a110539c5355f1cd8d314623e870b121ec858"
@@ -1252,6 +1270,11 @@ css-what@2.1:
   resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.3.tgz#a6d7604573365fe74686c3f311c56513d88285f2"
   integrity sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==
 
+css-what@^5.0.0:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/css-what/-/css-what-5.0.1.tgz#3efa820131f4669a8ac2408f9c32e7c7de9f4cad"
+  integrity sha512-FYDTSHb/7KXsWICVsxdmiExPjCfRC4qRFBdVwv7Ax9hMnvMmEjP9RfxTEZ3qPZGmADDn2vAKSo9UcN1jKVYscg==
+
 cuint@^0.2.2:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/cuint/-/cuint-0.2.2.tgz#408086d409550c2631155619e9fa7bcadc3b991b"
@@ -1320,6 +1343,15 @@ dom-serializer@0:
     domelementtype "^2.0.1"
     entities "^2.0.0"
 
+dom-serializer@^1.0.1:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-1.3.2.tgz#6206437d32ceefaec7161803230c7a20bc1b4d91"
+  integrity sha512-5c54Bk5Dw4qAxNOI1pFEizPSjVsx5+bpJKmL2kPn8JhBUq2q09tTCa3mjijun2NfK78NMouDYNMBkOrPZiS+ig==
+  dependencies:
+    domelementtype "^2.0.1"
+    domhandler "^4.2.0"
+    entities "^2.0.0"
+
 dom-serializer@~0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-0.1.1.tgz#1ec4059e284babed36eec2941d4a970a189ce7c0"
@@ -1338,6 +1370,11 @@ domelementtype@^2.0.1:
   resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-2.0.1.tgz#1f8bdfe91f5a78063274e803b4bdcedf6e94f94d"
   integrity sha512-5HOHUDsYZWV8FGWN0Njbr/Rn7f/eWSQi1v7+HsUVwXgn8nWWlL64zKDkS0n8ZmQ3mlWOMuXOnR+7Nx/5tMO5AQ==
 
+domelementtype@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-2.2.0.tgz#9a0b6c2782ed6a1c7323d42267183df9bd8b1d57"
+  integrity sha512-DtBMo82pv1dFtUmHyr48beiuq792Sxohr+8Hm9zoxklYPfa6n0Z3Byjj2IV7bmr2IyqClnqEQhfgHJJ5QF0R5A==
+
 domexception@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/domexception/-/domexception-1.0.1.tgz#937442644ca6a31261ef36e3ec677fe805582c90"
@@ -1352,6 +1389,18 @@ domhandler@^2.3.0:
   dependencies:
     domelementtype "1"
 
+domhandler@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/domhandler/-/domhandler-4.2.0.tgz#f9768a5f034be60a89a27c2e4d0f74eba0d8b059"
+  integrity sha512-zk7sgt970kzPks2Bf+dwT/PLzghLnsivb9CcxkvR8Mzr66Olr0Ofd8neSbglHJHaHa2MadfoSdNlKYAaafmWfA==
+  dependencies:
+    domelementtype "^2.2.0"
+
+dompurify@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/dompurify/-/dompurify-2.3.0.tgz#07bb39515e491588e5756b1d3e8375b5964814e2"
+  integrity sha512-VV5C6Kr53YVHGOBKO/F86OYX6/iLTw2yVSI721gKetxpHCK/V5TaLEf9ODjRgl1KLSWRMY6cUhAbv/c+IUnwQw==
+
 domutils@1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.5.1.tgz#dcd8488a26f563d61079e48c9f7b7e32373682cf"
@@ -1368,6 +1417,15 @@ domutils@^1.5.1:
     dom-serializer "0"
     domelementtype "1"
 
+domutils@^2.6.0:
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/domutils/-/domutils-2.7.0.tgz#8ebaf0c41ebafcf55b0b72ec31c56323712c5442"
+  integrity sha512-8eaHa17IwJUPAiB+SoTYBo5mCdeMgdcAoXJ59m6DT1vw+5iLS3gNoqYaRowaBKtGVrOF1Jz4yDTgYKLK2kvfJg==
+  dependencies:
+    dom-serializer "^1.0.1"
+    domelementtype "^2.2.0"
+    domhandler "^4.2.0"
+
 ee-first@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/ee-first/-/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
@@ -1726,6 +1784,11 @@ has-symbols@^1.0.0:
   resolved "https://registry.yarnpkg.com/has-symbols/-/has-symbols-1.0.1.tgz#9f5214758a44196c406d9bd76cebf81ec2dd31e8"
   integrity sha512-PLcsoqu++dmEIZB+6totNFKq/7Do+Z0u4oT0zKOJNl3lYK6vGwwu2hjHs+68OEZbTjiUE9bgOABXbP/GvrS0Kg==
 
+he@1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
+  integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
+
 htmlparser2@^3.9.1:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/htmlparser2/-/htmlparser2-3.10.1.tgz#bd679dc3f59897b6a34bb10749c855bb53a9392f"
@@ -2036,6 +2099,14 @@ natural-compare@^1.4.0:
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
   integrity sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=
 
+node-html-parser@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/node-html-parser/-/node-html-parser-4.0.0.tgz#95e4fec010c48425821d5659eaf39e27b0781b6d"
+  integrity sha512-vuOcp3u4GrfYOcqe+FpUffQKnfVBq781MbtFEcTR6fJYnYRE2qUPdDaDk7TGdq6H9r2B3TbyU6K9Rah6/C7qvg==
+  dependencies:
+    css-select "^4.1.3"
+    he "1.2.0"
+
 node-releases@^1.1.60:
   version "1.1.60"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.60.tgz#6948bdfce8286f0b5d0e5a88e8384e954dfe7084"
@@ -2051,6 +2122,13 @@ normalize-range@^0.1.2:
   resolved "https://registry.yarnpkg.com/normalize-range/-/normalize-range-0.1.2.tgz#2d10c06bdfd312ea9777695a4d28439456b75942"
   integrity sha1-LRDAa9/TEuqXd2laTShDlFa3WUI=
 
+nth-check@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/nth-check/-/nth-check-2.0.0.tgz#1bb4f6dac70072fc313e8c9cd1417b5074c0a125"
+  integrity sha512-i4sc/Kj8htBrAiH1viZ0TgU8Y5XqCaV/FziYK6TBczxmeKm3AEFWqqF3195yKudrarqy7Zu80Ra5dobFjn9X/Q==
+  dependencies:
+    boolbase "^1.0.0"
+
 nth-check@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/nth-check/-/nth-check-1.0.2.tgz#b2bd295c37e3dd58a3bf0700376663ba4d9cf05c"