Start working on images.

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

@@ -80,6 +80,15 @@ export class FormatPart {
     get type() { return "format"; }
 }
 
+export class ImagePart {
+    constructor(src, properties) {
+        this.src = src;
+        this.properties = properties;
+    }
+
+    get type() { return "image"; }
+};
+
 export class LinkPart {
     constructor(url, inlines) {
         this.url = url;

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

@@ -1,4 +1,4 @@
-import { MessageBody, HeaderBlock, ListBlock, CodeBlock, FormatPart, NewLinePart, RulePart, TextPart, LinkPart } from "./MessageBody.js"
+import { MessageBody, HeaderBlock, ListBlock, CodeBlock, FormatPart, NewLinePart, RulePart, TextPart, LinkPart, ImagePart } from "./MessageBody.js"
 
 
 /* At the time of writing (Jul 1 2021), Matrix Spec recommends
@@ -71,8 +71,27 @@ function parseCodeBlock(result, node) {
     return new CodeBlock(language, codeNode.textContent);
 }
 
+// TODO: duplicated from MediaRepository. Extract somewhere.
+function parseMxcUrl(url) {
+    const prefix = "mxc://";
+    if (url.startsWith(prefix)) {
+        return url.substr(prefix.length).split("/", 2);
+    } else {
+        return null;
+    }
+}
+
 function parseImage(result, node) {
-    return null;
+    const src = result.getAttributeValue(node, "src") || "";
+    // We just ignore non-mxc `src` attributes.
+    if (!parseMxcUrl(src)) {
+        return null;
+    }
+    const width = result.getAttributeValue(node, "width");
+    const height = result.getAttributeValue(node, "height");
+    const alt = result.getAttributeValue(node, "alt");
+    const title = result.getAttributeValue(node, "title");
+    return new ImagePart(src, { width, height, alt, title });
 }
 
 function buildNodeMap() {
@@ -135,7 +154,7 @@ function parseNodes(result, nodes) {
     return parsed;
 }
 
-export function parseHTMLBody(platform, html) {
+export function parseHTMLBody({ mediaRepository, platform }, html) {
     const parseResult = platform.parseHTML(html);
     const parts = parseNodes(parseResult, parseResult.rootNodes);
     return new MessageBody(html, parts);
@@ -187,7 +206,7 @@ const platform = {
 
 export function tests() {
     function test(assert, input, output) {
-        assert.deepEqual(parseHTMLBody(platform, input), new MessageBody(input, output));
+        assert.deepEqual(parseHTMLBody({ mediaRepository: null, platform }, input), new MessageBody(input, output));
     }
 
     return {

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

@@ -46,7 +46,7 @@ export class TextTile extends BaseTextTile {
     _parseBody(body) {
         const string = body.string;
         if (body.format === "html") {
-            return parseHTMLBody(this.platform, string);
+            return parseHTMLBody({ mediaRepository: this._mediaRepository, platform: this.platform }, string);
         } else {
             return parsePlainBody(string);
         }

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

@@ -41,6 +41,11 @@ function renderList(listBlock) {
         return tag.ul({}, items);
     }
 }
+
+function renderImage(imagePart) {
+    return text(imagePart.src);
+}
+
 /**
  * Map from part to function that outputs DOM for the part
  */
@@ -53,6 +58,7 @@ const formatFunction = {
     link: linkPart => tag.a({ href: linkPart.url, target: "_blank", rel: "noopener" }, renderParts(linkPart.inlines)),
     format: formatPart => tag[formatPart.format]({}, renderParts(formatPart.children)),
     list: renderList,
+    image: renderImage,
     newline: () => tag.br()
 };