[feature]: Support using system fonts (#304)

* [feature]: Support using system fonts

Uses the **experimental** queryLocalFonts API, when prompted, to get the fonts and do CSS.
Resolves #270 and #288 (by proxy)

Caveats/notes:
- This is experimental, and is only supported by Chrome/Chromium/Edgeium (see https://caniuse.com/?search=querylocalfonts)
- As far as I can tell, the only way to dynamically change the font (shown in https://wicg.github.io/local-font-access/#example-style-with-local-fonts) was by DOM manipulation; css variables did not seem to work
- This shows **all** fonts, including their variants (bold/italic/etc); given that the style names could be localized, not sure of a way to parse this (on my system, for instance, I had 859 different combinations)
- I made fonts a separate top-level setting because it was easier to manipulate without causing as many rerenders; feel free to put that back

* add permission chec

* add electron magic to support custom font

* restrict content types

src/main/main.ts

@@ -21,6 +21,8 @@ import {
     Menu,
     nativeImage,
     BrowserWindowConstructorOptions,
+    protocol,
+    net,
 } from 'electron';
 import electronLocalShortcut from 'electron-localshortcut';
 import log from 'electron-log';
@@ -43,6 +45,8 @@ export default class AppUpdater {
     }
 }
 
+protocol.registerSchemesAsPrivileged([{ privileges: { bypassCSP: true }, scheme: 'feishin' }]);
+
 process.on('uncaughtException', (error: any) => {
     console.log('Error in main process', error);
 });
@@ -653,8 +657,34 @@ app.on('window-all-closed', () => {
     }
 });
 
+const FONT_HEADERS = [
+    'font/collection',
+    'font/otf',
+    'font/sfnt',
+    'font/ttf',
+    'font/woff',
+    'font/woff2',
+];
+
 app.whenReady()
     .then(() => {
+        protocol.handle('feishin', async (request) => {
+            const filePath = `file://${request.url.slice('feishin://'.length)}`;
+            const response = await net.fetch(filePath);
+            const contentType = response.headers.get('content-type');
+
+            if (!contentType || !FONT_HEADERS.includes(contentType)) {
+                getMainWindow()?.webContents.send('custom-font-error', filePath);
+
+                return new Response(null, {
+                    status: 403,
+                    statusText: 'Forbidden',
+                });
+            }
+
+            return response;
+        });
+
         createWindow();
         createTray();
         app.on('activate', () => {

src/main/preload/local-settings.ts

@@ -1,4 +1,4 @@
-import { ipcRenderer, webFrame } from 'electron';
+import { IpcRendererEvent, ipcRenderer, webFrame } from 'electron';
 import Store from 'electron-store';
 
 const store = new Store();
@@ -39,9 +39,14 @@ const setZoomFactor = (zoomFactor: number) => {
     webFrame.setZoomFactor(zoomFactor / 100);
 };
 
+const fontError = (cb: (event: IpcRendererEvent, file: string) => void) => {
+    ipcRenderer.on('custom-font-error', cb);
+};
+
 export const localSettings = {
     disableMediaKeys,
     enableMediaKeys,
+    fontError,
     get,
     passwordGet,
     passwordRemove,

src/renderer/api/types.ts

@@ -1130,3 +1130,12 @@ export enum LyricSource {
 }
 
 export type LyricsOverride = Omit<FullLyricsMetadata, 'lyrics'> & { id: string };
+
+// This type from https://wicg.github.io/local-font-access/#fontdata
+// NOTE: it is still experimental, so this should be updates as appropriate
+export type FontData = {
+    family: string;
+    fullName: string;
+    postscriptName: string;
+    style: string;
+};

src/renderer/app.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo } from 'react';
+import { useEffect, useMemo, useRef } from 'react';
 import { ClientSideRowModelModule } from '@ag-grid-community/client-side-row-model';
 import { ModuleRegistry } from '@ag-grid-community/core';
 import { InfiniteRowModelModule } from '@ag-grid-community/infinite-row-model';
@@ -23,7 +23,7 @@ import { PlayQueueHandlerContext } from '/@/renderer/features/player';
 import { AddToPlaylistContextModal } from '/@/renderer/features/playlists';
 import { getMpvProperties } from '/@/renderer/features/settings/components/playback/mpv-settings';
 import { PlayerState, usePlayerStore, useQueueControls } from '/@/renderer/store';
-import { PlaybackType, PlayerStatus } from '/@/renderer/types';
+import { FontType, PlaybackType, PlayerStatus } from '/@/renderer/types';
 import '@ag-grid-community/styles/ag-grid.css';
 
 ModuleRegistry.registerModules([ClientSideRowModelModule, InfiniteRowModelModule]);
@@ -37,17 +37,48 @@ const remote = isElectron() ? window.electron.remote : null;
 
 export const App = () => {
     const theme = useTheme();
-    const contentFont = useSettingsStore((state) => state.general.fontContent);
+    const { builtIn, custom, system, type } = useSettingsStore((state) => state.font);
     const { type: playbackType } = usePlaybackSettings();
     const { bindings } = useHotkeySettings();
     const handlePlayQueueAdd = useHandlePlayQueueAdd();
     const { clearQueue, restoreQueue } = useQueueControls();
     const remoteSettings = useRemoteSettings();
+    const textStyleRef = useRef<HTMLStyleElement>();
 
     useEffect(() => {
-        const root = document.documentElement;
-        root.style.setProperty('--content-font-family', contentFont);
-    }, [contentFont]);
+        if (type === FontType.SYSTEM && system) {
+            const root = document.documentElement;
+            root.style.setProperty('--content-font-family', 'dynamic-font');
+
+            if (!textStyleRef.current) {
+                textStyleRef.current = document.createElement('style');
+                document.body.appendChild(textStyleRef.current);
+            }
+
+            textStyleRef.current.textContent = `
+            @font-face {
+                font-family: "dynamic-font";
+                src: local("${system}");
+            }`;
+        } else if (type === FontType.CUSTOM && custom) {
+            const root = document.documentElement;
+            root.style.setProperty('--content-font-family', 'dynamic-font');
+
+            if (!textStyleRef.current) {
+                textStyleRef.current = document.createElement('style');
+                document.body.appendChild(textStyleRef.current);
+            }
+
+            textStyleRef.current.textContent = `
+            @font-face {
+                font-family: "dynamic-font";
+                src: url("feishin://${custom}");
+            }`;
+        } else {
+            const root = document.documentElement;
+            root.style.setProperty('--content-font-family', builtIn);
+        }
+    }, [builtIn, custom, system, type]);
 
     const providerValue = useMemo(() => {
         return { handlePlayQueueAdd };

src/renderer/features/settings/components/general/application-settings.tsx

@@ -1,14 +1,27 @@
+import type { IpcRendererEvent } from 'electron';
 import isElectron from 'is-electron';
-import { NumberInput, Select } from '/@/renderer/components';
+import { FileInput, NumberInput, Select, toast } from '/@/renderer/components';
 import {
     SettingsSection,
     SettingOption,
 } from '/@/renderer/features/settings/components/settings-section';
-import { useGeneralSettings, useSettingsStoreActions } from '/@/renderer/store/settings.store';
+import {
+    useFontSettings,
+    useGeneralSettings,
+    useSettingsStoreActions,
+} from '/@/renderer/store/settings.store';
+import { useCallback, useEffect, useMemo, useState } from 'react';
+import { FontType } from '/@/renderer/types';
 
 const localSettings = isElectron() ? window.electron.localSettings : null;
+const ipc = isElectron() ? window.electron.ipc : null;
+
+type Font = {
+    label: string;
+    value: string;
+};
 
-const FONT_OPTIONS = [
+const FONT_OPTIONS: Font[] = [
     { label: 'Archivo', value: 'Archivo' },
     { label: 'Fredoka', value: 'Fredoka' },
     { label: 'Inter', value: 'Inter' },
@@ -20,9 +33,99 @@ const FONT_OPTIONS = [
     { label: 'Work Sans', value: 'Work Sans' },
 ];
 
+const FONT_TYPES: Font[] = [{ label: 'Built-in font', value: FontType.BUILT_IN }];
+
+if (window.queryLocalFonts) {
+    FONT_TYPES.push({ label: 'System font', value: FontType.SYSTEM });
+}
+
+if (isElectron()) {
+    FONT_TYPES.push({ label: 'Custom font', value: FontType.CUSTOM });
+}
+
 export const ApplicationSettings = () => {
     const settings = useGeneralSettings();
+    const fontSettings = useFontSettings();
     const { setSettings } = useSettingsStoreActions();
+    const [localFonts, setLocalFonts] = useState<Font[]>([]);
+
+    const fontList = useMemo(() => {
+        if (fontSettings.custom) {
+            const newFile = new File([], fontSettings.custom.split(/(\\|\/)/g).pop()!);
+            newFile.path = fontSettings.custom;
+            return newFile;
+        }
+        return null;
+    }, [fontSettings.custom]);
+
+    const onFontError = useCallback(
+        (_: IpcRendererEvent, file: string) => {
+            toast.error({
+                message: `${file} is not a valid font file`,
+            });
+
+            setSettings({
+                font: {
+                    ...fontSettings,
+                    custom: null,
+                },
+            });
+        },
+        [fontSettings, setSettings],
+    );
+
+    useEffect(() => {
+        if (localSettings) {
+            localSettings.fontError(onFontError);
+
+            return () => {
+                ipc!.removeAllListeners('custom-font-error');
+            };
+        }
+
+        return () => {};
+    }, [onFontError]);
+
+    useEffect(() => {
+        const getFonts = async () => {
+            if (
+                fontSettings.type === FontType.SYSTEM &&
+                localFonts.length === 0 &&
+                window.queryLocalFonts
+            ) {
+                try {
+                    // WARNING (Oct 17 2023): while this query is valid for chromium-based
+                    // browsers, it is still experimental, and so Typescript will complain
+                    // @ts-ignore
+                    const status = await navigator.permissions.query({ name: 'local-fonts' });
+
+                    if (status.state === 'denied') {
+                        throw new Error('Access denied to local fonts');
+                    }
+
+                    const data = await window.queryLocalFonts();
+                    setLocalFonts(
+                        data.map((font) => ({
+                            label: font.fullName,
+                            value: font.postscriptName,
+                        })),
+                    );
+                } catch (error) {
+                    toast.error({
+                        message: 'An error occurred when trying to get system fonts',
+                    });
+
+                    setSettings({
+                        font: {
+                            ...fontSettings,
+                            type: FontType.BUILT_IN,
+                        },
+                    });
+                }
+            }
+        };
+        getFonts();
+    }, [fontSettings, localFonts, setSettings]);
 
     const options: SettingOption[] = [
         {
@@ -36,27 +139,90 @@ export const ApplicationSettings = () => {
             isHidden: false,
             title: 'Language',
         },
+        {
+            control: (
+                <Select
+                    data={FONT_TYPES}
+                    value={fontSettings.type}
+                    onChange={(e) => {
+                        if (!e) return;
+                        setSettings({
+                            font: {
+                                ...fontSettings,
+                                type: e as FontType,
+                            },
+                        });
+                    }}
+                />
+            ),
+            description:
+                'What font to use. Built-in font selects one of the fonts provided by Feishin. System font allows you to select any font provided by your OS. Custom allows you to provide your own font',
+            isHidden: FONT_TYPES.length === 1,
+            title: 'Use system font',
+        },
         {
             control: (
                 <Select
                     searchable
                     data={FONT_OPTIONS}
-                    defaultValue={settings.fontContent}
+                    value={fontSettings.builtIn}
                     onChange={(e) => {
                         if (!e) return;
                         setSettings({
-                            general: {
-                                ...settings,
-                                fontContent: e,
+                            font: {
+                                ...fontSettings,
+                                builtIn: e,
                             },
                         });
                     }}
                 />
             ),
             description: 'Sets the application content font',
-            isHidden: false,
+            isHidden: localFonts && fontSettings.type !== FontType.BUILT_IN,
             title: 'Font (Content)',
         },
+        {
+            control: (
+                <Select
+                    searchable
+                    data={localFonts}
+                    value={fontSettings.system}
+                    w={300}
+                    onChange={(e) => {
+                        if (!e) return;
+                        setSettings({
+                            font: {
+                                ...fontSettings,
+                                system: e,
+                            },
+                        });
+                    }}
+                />
+            ),
+            description: 'Sets the application content font',
+            isHidden: !localFonts || fontSettings.type !== FontType.SYSTEM,
+            title: 'Font (Content)',
+        },
+        {
+            control: (
+                <FileInput
+                    accept=".ttc,.ttf,.otf,.woff,.woff2"
+                    defaultValue={fontList}
+                    w={300}
+                    onChange={(e) =>
+                        setSettings({
+                            font: {
+                                ...fontSettings,
+                                custom: e?.path ?? null,
+                            },
+                        })
+                    }
+                />
+            ),
+            description: 'Path to custom font',
+            isHidden: fontSettings.type !== FontType.CUSTOM,
+            title: 'Path to custom font',
+        },
         {
             control: (
                 <NumberInput

src/renderer/preload.d.ts

@@ -1,6 +1,6 @@
 import { IpcRendererEvent } from 'electron';
 import { PlayerData, PlayerState } from './store';
-import { InternetProviderLyricResponse, QueueSong } from '/@/renderer/api/types';
+import { FontData, InternetProviderLyricResponse, QueueSong } from '/@/renderer/api/types';
 import { Remote } from '/@/main/preload/remote';
 import { Mpris } from '/@/main/preload/mpris';
 import { MpvPLayer, MpvPlayerListener } from '/@/main/preload/mpv-player';
@@ -76,6 +76,7 @@ declare global {
             remote?: Remote;
             utils?: Utils;
         };
+        queryLocalFonts?: () => Promise<FontData[]>;
     }
 }