Remove usages of Buffer so we don't need to ship the polyfill

.eslintrc.js

@@ -42,6 +42,10 @@ module.exports = {
                 name: "setImmediate",
                 message: "Use setTimeout instead.",
             },
+            {
+                name: "Buffer",
+                message: "Buffer is not available in the web.",
+            },
         ],
 
         "import/no-duplicates": ["error"],
@@ -255,6 +259,9 @@ module.exports = {
                         additionalTestBlockFunctions: ["beforeAll", "beforeEach", "oldBackendOnly"],
                     },
                 ],
+
+                // These are fine in tests
+                "no-restricted-globals": "off",
             },
         },
         {

package.json

@@ -214,7 +214,6 @@
         "babel-loader": "^9.0.0",
         "babel-plugin-jsx-remove-data-test-id": "^3.0.0",
         "blob-polyfill": "^9.0.0",
-        "buffer": "^6.0.3",
         "chokidar": "^4.0.0",
         "concurrently": "^9.0.0",
         "copy-webpack-plugin": "^12.0.0",

playwright/e2e/crypto/device-verification.spec.ts

@@ -102,7 +102,7 @@ test.describe("Device verification", () => {
         // feed the QR code into the verification request.
         const qrData = await readQrCode(infoDialog);
         const verifier = await verificationRequest.evaluateHandle(
-            (request, qrData) => request.scanQRCode(new Uint8Array(qrData)),
+            (request, qrData) => request.scanQRCode(new Uint8ClampedArray(qrData)),
             [...qrData],
         );
 

src/@types/png-chunks-extract.d.ts

@@ -12,7 +12,7 @@ declare module "png-chunks-extract" {
         data: Uint8Array;
     }
 
-    function extractPngChunks(data: Uint8Array | Buffer): IChunk[];
+    function extractPngChunks(data: Uint8Array): IChunk[];
 
     export default extractPngChunks;
 }

src/DecryptionFailureTracker.ts

@@ -6,7 +6,7 @@ SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
 Please see LICENSE files in the repository root for full details.
 */
 
-import { ScalableBloomFilter } from "bloom-filters";
+import ScalableBloomFilter from "bloom-filters/dist/bloom/scalable-bloom-filter";
 import { HttpApiEvent, MatrixClient, MatrixEventEvent, MatrixEvent } from "matrix-js-sdk/src/matrix";
 import { Error as ErrorEvent } from "@matrix-org/analytics-events/types/typescript/Error";
 import { DecryptionFailureCode, CryptoEvent } from "matrix-js-sdk/src/crypto-api";

src/components/views/auth/LoginWithQR.tsx

@@ -37,7 +37,6 @@ interface IState {
     userCode?: string;
     checkCode?: string;
     failureReason?: FailureReason;
-    lastScannedCode?: Buffer;
 }
 
 export enum LoginWithQRFailureReason {
@@ -154,7 +153,7 @@ export default class LoginWithQR extends React.Component<IProps, IState> {
             throw new Error("Rendezvous not found");
         }
 
-        if (!this.state.lastScannedCode && this.state.rendezvous?.checkCode !== checkCode) {
+        if (this.state.rendezvous?.checkCode !== checkCode) {
             this.setState({ failureReason: LoginWithQRFailureReason.CheckCodeMismatch });
             return;
         }
@@ -201,7 +200,6 @@ export default class LoginWithQR extends React.Component<IProps, IState> {
             failureReason: undefined,
             userCode: undefined,
             checkCode: undefined,
-            lastScannedCode: undefined,
             mediaPermissionError: false,
         });
     }

src/components/views/elements/crypto/VerificationQRCode.tsx

@@ -12,7 +12,7 @@ import QRCode from "../QRCode";
 
 interface IProps {
     /** The data for the QR code. If `undefined`, a spinner is shown. */
-    qrCodeBytes: undefined | Buffer;
+    qrCodeBytes: undefined | Uint8ClampedArray;
 }
 
 export default class VerificationQRCode extends React.PureComponent<IProps> {

src/components/views/right_panel/VerificationPanel.tsx

@@ -46,7 +46,7 @@ interface IState {
      * We attempt to calculate this once the verification request transitions into the "Ready" phase. If the other
      * side cannot scan QR codes, it will remain `undefined`.
      */
-    qrCodeBytes: Buffer | undefined;
+    qrCodeBytes: Uint8ClampedArray | undefined;
 
     sasEvent: ShowSasCallbacks | null;
     emojiButtonClicked?: boolean;

src/stores/ThreepidInviteStore.ts

@@ -99,7 +99,7 @@ export default class ThreepidInviteStore extends EventEmitter {
 
     private generateIdOf(persisted: IPersistedThreepidInvite): string {
         // Use a consistent "hash" to form an ID.
-        return base32.stringify(Buffer.from(JSON.stringify(persisted)));
+        return base32.stringify(new TextEncoder().encode(JSON.stringify(persisted)));
     }
 
     private translateInvite(persisted: IPersistedThreepidInvite): IThreepidInvite {

src/utils/WidgetUtils.ts

@@ -445,7 +445,7 @@ export default class WidgetUtils {
             // For compatibility with Jitsi, use base32 without padding.
             // More details here:
             // https://github.com/matrix-org/prosody-mod-auth-matrix-user-verification
-            confId = base32.stringify(Buffer.from(roomId), { pad: false });
+            confId = base32.stringify(new TextEncoder().encode(roomId), { pad: false });
         } else {
             // Create a random conference ID
             confId = `Jitsi${randomUppercaseString(1)}${randomLowercaseString(23)}`;

src/utils/exportUtils/HtmlExport.tsx

@@ -431,7 +431,7 @@ export default class HTMLExporter extends Exporter {
                 !this.needsDateSeparator(event, prevEvent) &&
                 shouldFormContinuation(prevEvent, event, this.room.client, false);
             const body = await this.createMessageBody(event, shouldBeJoined);
-            this.totalSize += Buffer.byteLength(body);
+            this.totalSize += new TextEncoder().encode(body).byteLength;
             content += body;
             prevEvent = event;
         }

src/utils/tokens/pickling.ts

@@ -118,7 +118,7 @@ export async function buildAndEncodePickleKey(
             data.encrypted,
         );
         if (pickleKeyBuf) {
-            return encodeUnpaddedBase64(pickleKeyBuf);
+            return encodeUnpaddedBase64(new Uint8Array(pickleKeyBuf));
         }
     } catch {
         logger.error("Error decrypting pickle key");

test/unit-tests/Lifecycle-test.ts

@@ -418,7 +418,7 @@ describe("Lifecycle", () => {
                         undefined,
                     );
 
-                    expect(MatrixClientPeg.start).toHaveBeenCalledWith({ rustCryptoStoreKey: expect.any(Buffer) });
+                    expect(MatrixClientPeg.start).toHaveBeenCalledWith({ rustCryptoStoreKey: expect.any(Uint8Array) });
                 });
 
                 describe("with a refresh token", () => {

test/unit-tests/components/views/elements/crypto/VerificationQRCode-test.tsx

@@ -17,7 +17,9 @@ describe("<VerificationQRCode />", () => {
     });
 
     it("renders a QR code", async () => {
-        const { container, getAllByAltText } = render(<VerificationQRCode qrCodeBytes={Buffer.from("asd")} />);
+        const { container, getAllByAltText } = render(
+            <VerificationQRCode qrCodeBytes={new Uint8ClampedArray(Buffer.from("asd"))} />,
+        );
         // wait for the spinner to go away
         await waitFor(() => getAllByAltText("QR Code").length === 1);
         expect(container).toMatchSnapshot();

test/unit-tests/components/views/right_panel/VerificationPanel-test.tsx

@@ -46,7 +46,7 @@ describe("<VerificationPanel />", () => {
             const request = makeMockVerificationRequest({
                 phase: Phase.Ready,
             });
-            request.generateQRCode.mockResolvedValue(Buffer.from("test", "utf-8"));
+            request.generateQRCode.mockResolvedValue(new Uint8ClampedArray(Buffer.from("test", "utf-8")));
             const container = renderComponent({
                 request: request,
                 layout: "dialog",
@@ -71,7 +71,7 @@ describe("<VerificationPanel />", () => {
             const request = makeMockVerificationRequest({
                 phase: Phase.Ready,
             });
-            request.generateQRCode.mockResolvedValue(Buffer.from("test", "utf-8"));
+            request.generateQRCode.mockResolvedValue(new Uint8ClampedArray(Buffer.from("test", "utf-8")));
             const container = renderComponent({
                 request: request,
                 member: new User("@other:user"),

webpack.config.js

@@ -231,8 +231,6 @@ module.exports = (env, argv) => {
 
                 // Polyfill needed by counterpart
                 "util": require.resolve("util/"),
-                // Polyfill needed by matrix-js-sdk/src/crypto
-                "buffer": require.resolve("buffer/"),
                 // Polyfill needed by sentry
                 "process/browser": require.resolve("process/browser"),
             },
@@ -679,7 +677,6 @@ module.exports = (env, argv) => {
             // Automatically load buffer & process modules as we use them without explicitly
             // importing them
             new webpack.ProvidePlugin({
-                Buffer: ["buffer", "Buffer"],
                 process: "process/browser",
             }),
 

yarn.lock

@@ -4044,11 +4044,6 @@ base64-arraybuffer@^1.0.2:
   resolved "https://registry.yarnpkg.com/base64-arraybuffer/-/base64-arraybuffer-1.0.2.tgz#1c37589a7c4b0746e34bd1feb951da2df01c1bdc"
   integrity sha512-I3yl4r9QB5ZRY3XuJVEPfc2XhZO6YweFPI+UovAzn+8/hb3oJ6lnysaFcjVpkCPfVWFUDvoZ8kmVDP7WyRtYtQ==
 
-base64-js@^1.3.1:
-  version "1.5.1"
-  resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.5.1.tgz#1b1b440160a5bf7ad40b650f095963481903930a"
-  integrity sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==
-
 [email protected]:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/batch/-/batch-0.6.1.tgz#dc34314f4e679318093fc760272525f94bf25c16"
@@ -4170,14 +4165,6 @@ buffer-from@^1.0.0:
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.2.tgz#2b146a6fd72e80b4f55d255f35ed59a3a9a41bd5"
   integrity sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==
 
-buffer@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/buffer/-/buffer-6.0.3.tgz#2ace578459cc8fbe2a70aaa8f52ee63b6a74c6c6"
-  integrity sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==
-  dependencies:
-    base64-js "^1.3.1"
-    ieee754 "^1.2.1"
-
 builtin-modules@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-3.3.0.tgz#cae62812b89801e9656336e46223e030386be7b6"
@@ -6777,7 +6764,7 @@ icss-utils@^5.0.0, icss-utils@^5.1.0:
   resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-5.1.0.tgz#c6be6858abd013d768e98366ae47e25d5887b1ae"
   integrity sha512-soFhflCVWLfRNOPU3iv5Z9VUdT44xFRbzjLsEzSr5AQmgqPMTHdU3PMT1Cf1ssx8fLNJDA1juftYl+PUcv3MqA==
 
-ieee754@^1.1.12, ieee754@^1.2.1:
+ieee754@^1.1.12:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/ieee754/-/ieee754-1.2.1.tgz#8eb7a10a63fff25d15a57b001586d177d1b0d352"
   integrity sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==