fix(forward): warn when forwarding out of an encrypted room into one that is not (#330)

Forwarding from an encrypted room into an unencrypted one posts the text
(and a re-uploaded plaintext attachment) where the server can read it,
with the original author attached, and the dialog said nothing. Show a
note above Send naming the unencrypted destination(s).

Refs #330

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/features/room/message/ForwardMessageDialog.tsx

@@ -47,8 +47,12 @@ import {
   recentForwardTargetsAtom,
   addRecentForwardTarget,
 } from '../../../state/recentForwardTargets';
-import { buildForwardContent, buildPlaintextAttachmentContent } from './forwardContent';
-import { useLocalRoomNames } from '../../../hooks/useRoomMeta';
+import {
+  buildForwardContent,
+  buildPlaintextAttachmentContent,
+  forwardEncryptionWarning,
+} from './forwardContent';
+import { useLocalRoomNames, getLocalRoomName } from '../../../hooks/useRoomMeta';
 
 type RoomRowProps = {
   room: Room;
@@ -275,6 +279,14 @@ export function ForwardMessageDialog({ mEvent, onClose }: Props) {
   // Selection persists across query changes: a room selected then filtered out
   // of the rendered slice stays selected.
   const [selectedRoomIds, setSelectedRoomIds] = useState<Set<string>>(new Set());
+  const encryptionWarning = forwardEncryptionWarning(
+    !!mx.getRoom(mEvent.getRoomId() ?? '')?.hasEncryptionStateEvent(),
+    [...selectedRoomIds]
+      .map((id) => mx.getRoom(id))
+      .filter((r): r is Room => !!r && !r.hasEncryptionStateEvent())
+      // The name the user sees (their own "Rename for me" name, if set).
+      .map((r) => getLocalRoomName(mx, r.roomId) ?? r.name),
+  );
 
   const toggleRoom = useCallback((roomId: string) => {
     setSelectedRoomIds((prev) => {
@@ -590,7 +602,13 @@ export function ForwardMessageDialog({ mEvent, onClose }: Props) {
                   shrink="No"
                   direction="Column"
                   style={{ padding: `${config.space.S200} ${config.space.S400}` }}
+                  gap="200"
                 >
+                  {encryptionWarning && (
+                    <Text size="T200" role="note" style={{ color: color.Warning.Main }}>
+                      {encryptionWarning}
+                    </Text>
+                  )}
                   <Button
                     variant="Primary"
                     size="400"

src/app/features/room/message/forwardContent.test.ts

@@ -1,7 +1,7 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { MatrixClient, MatrixEvent } from 'matrix-js-sdk';
-import { buildForwardContent, getForwardedMeta } from './forwardContent';
+import { buildForwardContent, forwardEncryptionWarning, getForwardedMeta } from './forwardContent';
 
 // Pure content builder buildForwardContent: refuses undecryptable events, forwards
 // the latest edit (`m.new_content`), and strips reply fallbacks + `m.relates_to`.
@@ -171,3 +171,16 @@ test('getForwardedMeta rejects malformed metadata', () => {
   assert.equal(getForwardedMeta({ 'io.lotus.forwarded': { sender: 1 } }), undefined);
   assert.equal(getForwardedMeta({}), undefined);
 });
+
+test('forwardEncryptionWarning: only from an encrypted room into unencrypted ones (#330)', () => {
+  assert.equal(forwardEncryptionWarning(false, ['general']), undefined);
+  assert.equal(forwardEncryptionWarning(true, []), undefined);
+  assert.match(
+    forwardEncryptionWarning(true, ['general']) ?? '',
+    /^general isn't encrypted\..*that room, along with who originally wrote it\.$/,
+  );
+  assert.match(
+    forwardEncryptionWarning(true, ['a', 'b']) ?? '',
+    /^2 of the rooms you picked aren't encrypted\..*those rooms/,
+  );
+});

src/app/features/room/message/forwardContent.ts

@@ -122,3 +122,23 @@ export async function buildPlaintextAttachmentContent(
 
   return plainContent;
 }
+
+/**
+ * [Gitea #330] The note shown when forwarding out of an encrypted room into
+ * rooms that aren't: the text (and a re-uploaded attachment) becomes readable
+ * by the server, and the original author is shown with it. Undefined when
+ * there's nothing to warn about.
+ */
+export function forwardEncryptionWarning(
+  sourceEncrypted: boolean,
+  unencryptedDestNames: string[],
+): string | undefined {
+  if (!sourceEncrypted || unencryptedDestNames.length === 0) return undefined;
+  const where =
+    unencryptedDestNames.length === 1
+      ? `${unencryptedDestNames[0]} isn't encrypted.`
+      : `${unencryptedDestNames.length} of the rooms you picked aren't encrypted.`;
+  return `${where} The forwarded message (and any attachment) will be readable by the server and everyone in ${
+    unencryptedDestNames.length === 1 ? 'that room' : 'those rooms'
+  }, along with who originally wrote it.`;
+}

src/app/plugins/call/CallEmbed.ts

@@ -218,9 +218,6 @@ export class CallEmbed {
       //  - transparent background so the room wallpaper shows through natively
       lotusCallState: 'true',
       lotusTransparent: 'true',
-      // [Gitea #293] the fork applies the theme with transparency anyway, and
-      // warned in every call that lotusTheme wasn't set
-      lotusTheme: 'true',
       // [Gitea #43] The fork hides its own footer (we draw the call bar) and
       // sets its root color-scheme from the theme, instead of us injecting CSS.
       lotusHostControls: 'true',

vite.config.js

@@ -87,106 +87,97 @@ function copyPdfWorker() {
   };
 }
 
-// The denoise assets the fork loads from ./denoise/ at runtime, as
-// [source, path under denoise/] pairs; `dir: true` entries are whole trees.
-// Shared by the build copy and the dev server (Gitea #293).
-function denoiseSources() {
-  const sapphi = path.resolve('node_modules/@sapphi-red/web-noise-suppressor/dist');
-  const dfnVendor = path.resolve('build/denoise-vendor/deepfilternet');
-  return {
-    // All bundled denoise assets are REQUIRED: every entry backs a model the
-    // UI can select (RNNoise, Speex) or the optional noise gate.
-    sapphi: [
-      [path.join(sapphi, 'rnnoise/workletProcessor.js'), 'rnnoiseWorklet.js'],
-      [path.join(sapphi, 'rnnoise.wasm'), 'rnnoise.wasm'],
-      [path.join(sapphi, 'rnnoise_simd.wasm'), 'rnnoise_simd.wasm'],
-      [path.join(sapphi, 'speex/workletProcessor.js'), 'speexWorklet.js'],
-      [path.join(sapphi, 'speex.wasm'), 'speex.wasm'],
-      [path.join(sapphi, 'noiseGate/workletProcessor.js'), 'noiseGateWorklet.js'],
-    ],
-    // DTLN (@workadventure/noise-suppression): a self-contained ES module that
-    // resolves its own worklet, LiteRT WASM runtime and TFLite models via
-    // `import.meta.url`, so its whole dist/ tree is served intact.
-    dtln: [path.resolve('node_modules/@workadventure/noise-suppression/dist'), 'workadventure'],
-    // DeepFilterNet 3: the ESM (worklet inlined) plus the vendored wasm and ONNX
-    // model (CDN-free / Tauri-CSP safe), in the package's expected v2/ layout.
-    dfn: [
-      [
-        path.resolve('node_modules/deepfilternet3-noise-filter/dist/index.esm.js'),
-        'deepfilternet/index.esm.js',
-      ],
-      [path.join(dfnVendor, 'v2/pkg/df_bg.wasm'), 'deepfilternet/v2/pkg/df_bg.wasm'],
-      [
-        path.join(dfnVendor, 'v2/models/DeepFilterNet3_onnx.tar.gz'),
-        'deepfilternet/v2/models/DeepFilterNet3_onnx.tar.gz',
-      ],
-    ],
-  };
-}
-
-// Lotus ML noise suppression: ship the denoise worklets/wasm/models alongside
-// the vendored Element Call bundle. Runs after viteStaticCopy has populated
-// dist/public/element-call (closeBundle order). [Gitea #293] The dev server
-// serves the same files at the same URLs, so `npm start` can test denoise.
+// Lotus ML noise suppression: ship the RNNoise worklet/wasm + our getUserMedia
+// shim alongside the vendored Element Call bundle, and inject the shim <script>
+// into EC's index.html so it runs before EC captures the mic. Runs after
+// viteStaticCopy has populated dist/public/element-call (closeBundle order).
 function lotusDenoise() {
-  const DEV_PREFIX = '/public/element-call/denoise/';
   return {
     name: 'lotus-denoise',
-    configureServer(server) {
-      const { sapphi, dtln, dfn } = denoiseSources();
-      const files = new Map([...sapphi, ...dfn].map(([src, rel]) => [rel, src]));
-      const types = { '.js': 'text/javascript', '.wasm': 'application/wasm' };
-      server.middlewares.use((req, res, next) => {
-        const url = (req.url ?? '').split('?')[0];
-        if (!url.startsWith(DEV_PREFIX)) return next();
-        const rel = decodeURIComponent(url.slice(DEV_PREFIX.length));
-        let file = files.get(rel);
-        if (!file && rel.startsWith(`${dtln[1]}/`)) {
-          const candidate = path.resolve(dtln[0], rel.slice(dtln[1].length + 1));
-          if (candidate.startsWith(dtln[0] + path.sep)) file = candidate;
-        }
-        if (!file || !fs.existsSync(file)) return next();
-        res.setHeader('Content-Type', types[path.extname(file)] ?? 'application/octet-stream');
-        fs.createReadStream(file).pipe(res);
-        return undefined;
-      });
-    },
     closeBundle() {
       const ecDir = path.resolve('dist/public/element-call');
       if (!fs.existsSync(ecDir)) return;
 
       const denoiseDir = path.join(ecDir, 'denoise');
       fs.mkdirSync(denoiseDir, { recursive: true });
-      const { sapphi, dtln, dfn } = denoiseSources();
 
-      // A missing source means a partial/changed install would otherwise
-      // silently ship a broken ML feature (worklet 404 -> raw mic), so we fail
-      // the build instead.
-      const missing = sapphi.filter(([s]) => !fs.existsSync(s)).map(([s]) => s);
+      const sapphi = path.resolve('node_modules/@sapphi-red/web-noise-suppressor/dist');
+      // All bundled denoise assets are REQUIRED: every entry backs a model the
+      // UI can select (RNNoise, Speex) or the optional noise gate. A missing
+      // source means a partial/changed install would otherwise silently ship a
+      // broken ML feature (worklet 404 -> raw mic), so we fail the build instead.
+      const assets = [
+        [
+          path.join(sapphi, 'rnnoise/workletProcessor.js'),
+          path.join(denoiseDir, 'rnnoiseWorklet.js'),
+        ],
+        [path.join(sapphi, 'rnnoise.wasm'), path.join(denoiseDir, 'rnnoise.wasm')],
+        [path.join(sapphi, 'rnnoise_simd.wasm'), path.join(denoiseDir, 'rnnoise_simd.wasm')],
+        [path.join(sapphi, 'speex/workletProcessor.js'), path.join(denoiseDir, 'speexWorklet.js')],
+        [path.join(sapphi, 'speex.wasm'), path.join(denoiseDir, 'speex.wasm')],
+        [
+          path.join(sapphi, 'noiseGate/workletProcessor.js'),
+          path.join(denoiseDir, 'noiseGateWorklet.js'),
+        ],
+      ];
+      const missing = assets.filter(([s]) => !fs.existsSync(s)).map(([s]) => s);
       if (missing.length > 0) {
         throw new Error(
           `[lotus-denoise] Required denoise asset(s) missing — build aborted to avoid shipping a broken ML feature:\n  ${missing.join('\n  ')}`,
         );
       }
-      sapphi.forEach(([s, rel]) => fs.copyFileSync(s, path.join(denoiseDir, rel)));
+      assets.forEach(([s, d]) => fs.copyFileSync(s, d));
 
-      const dtlnEntry = path.join(dtln[0], 'audio-worklet.js');
+      // DTLN (@workadventure/noise-suppression): unlike the flat sapphi
+      // worklets, this package is a self-contained ES module that resolves its
+      // own AudioWorklet processor, LiteRT WASM runtime and TFLite models via
+      // `import.meta.url`. So we copy its whole dist/ tree intact to
+      // denoise/workadventure/ (preserving assets/ + vendor/) and let the shim
+      // dynamic-import denoise/workadventure/audio-worklet.js at runtime. The
+      // entry module is required — fail the build if the install is broken.
+      const dtlnSrc = path.resolve('node_modules/@workadventure/noise-suppression/dist');
+      const dtlnEntry = path.join(dtlnSrc, 'audio-worklet.js');
       if (!fs.existsSync(dtlnEntry)) {
         throw new Error(
           `[lotus-denoise] DTLN entry missing (${dtlnEntry}) — build aborted. ` +
             'Run `npm ci` to install @workadventure/noise-suppression.',
         );
       }
-      fs.cpSync(dtln[0], path.join(denoiseDir, dtln[1]), { recursive: true });
+      fs.cpSync(dtlnSrc, path.join(denoiseDir, 'workadventure'), { recursive: true });
 
-      const dfnMissing = dfn.filter(([s]) => !fs.existsSync(s)).map(([s]) => s);
+      // DeepFilterNet 3 (deepfilternet3-noise-filter): the npm package ships only
+      // its ESM (index.esm.js) with the AudioWorklet processor + wasm-bindgen glue
+      // INLINED as a string (loaded via a Blob URL, no CDN for the worklet). The
+      // only runtime CDN fetches are its single-threaded `df_bg.wasm` and the
+      // ONNX `DeepFilterNet3_onnx.tar.gz` model — which we VENDOR locally (under
+      // build/denoise-vendor/deepfilternet/) and serve, overriding the package's
+      // cdnUrl to our self-hosted base. This keeps the feature CDN-free / Tauri-CSP
+      // safe. We copy the ESM (the shim dynamic-imports it, mirroring DTLN) plus
+      // the vendored assets, preserving the package's expected v2/... layout. All
+      // are required — a missing entry means a broken install, so fail the build.
+      const dfnEsm = path.resolve('node_modules/deepfilternet3-noise-filter/dist/index.esm.js');
+      const dfnVendor = path.resolve('build/denoise-vendor/deepfilternet');
+      const dfnAssets = [
+        [dfnEsm, path.join(denoiseDir, 'deepfilternet/index.esm.js')],
+        [
+          path.join(dfnVendor, 'v2/pkg/df_bg.wasm'),
+          path.join(denoiseDir, 'deepfilternet/v2/pkg/df_bg.wasm'),
+        ],
+        [
+          path.join(dfnVendor, 'v2/models/DeepFilterNet3_onnx.tar.gz'),
+          path.join(denoiseDir, 'deepfilternet/v2/models/DeepFilterNet3_onnx.tar.gz'),
+        ],
+      ];
+      const dfnMissing = dfnAssets.filter(([s]) => !fs.existsSync(s)).map(([s]) => s);
       if (dfnMissing.length > 0) {
         throw new Error(
-          `[lotus-denoise] DeepFilterNet 3 asset(s) missing — build aborted to avoid shipping a broken ML feature:\n  ${dfnMissing.join('\n  ')}\n(Run \`npm ci\`; the vendored wasm/model live under build/denoise-vendor/deepfilternet/.)`,
+          '[lotus-denoise] DeepFilterNet 3 asset(s) missing — build aborted to avoid ' +
+            'shipping a broken ML feature:\n  ' +
+            dfnMissing.join('\n  ') +
+            '\n(Run `npm ci`; the vendored wasm/model live under build/denoise-vendor/deepfilternet/.)',
         );
       }
-      dfn.forEach(([s, rel]) => {
-        const d = path.join(denoiseDir, rel);
+      dfnAssets.forEach(([s, d]) => {
         fs.mkdirSync(path.dirname(d), { recursive: true });
         fs.copyFileSync(s, d);
       });