signal-desktop/app/updateDefaultSession.ts

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// Copyright 2022 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
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import type { Session, DesktopCapturerSource, IpcMainEvent } from 'electron';
import { desktopCapturer, ipcMain } from 'electron';
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import { v4 as generateUuid } from 'uuid';
import OS from '../ts/util/os/osMain';
import type { LoggerType } from '../ts/types/Logging';
import { strictAssert } from '../ts/util/assert';
import { type IpcResponseType } from '../ts/util/desktopCapturer';
const SPELL_CHECKER_DICTIONARY_DOWNLOAD_URL = `https://updates.signal.org/desktop/hunspell_dictionaries/${process.versions.electron}/`;
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export function updateDefaultSession(
session: Session,
getLogger: () => LoggerType
): void {
session.setSpellCheckerDictionaryDownloadURL(
SPELL_CHECKER_DICTIONARY_DOWNLOAD_URL
);
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session.setDisplayMediaRequestHandler(
async (request, callback) => {
const { frame, videoRequested, audioRequested } = request;
try {
strictAssert(videoRequested, 'Not requesting video');
strictAssert(!audioRequested, 'Requesting audio');
const sources = await desktopCapturer.getSources({
fetchWindowIcons: true,
thumbnailSize: { height: 102, width: 184 },
types: ['screen', 'window'],
});
// Wayland already shows a window/screen selection modal so we just
// have to go with the source that we were given.
if (OS.isLinux() && OS.isWaylandEnabled() && sources.length === 1) {
callback({ video: sources[0] });
return;
}
const id = generateUuid();
ipcMain.once(
`select-capture-sources:${id}:response`,
(_event: IpcMainEvent, stream: DesktopCapturerSource | undefined) => {
try {
callback({ video: stream });
} catch {
// Don't let Electron errors crash the app
}
}
);
frame?.send('select-capture-sources', {
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id,
sources,
} satisfies IpcResponseType);
} catch (error) {
try {
callback({});
} catch {
// Electron throws error here, but this is the only way to cancel the
// request.
}
getLogger().error('Failed to get desktopCapturer sources', error);
}
},
{ useSystemPicker: false }
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);
}