Custom themes (#584)

* Add support for custom themes (fixes #560)

* load theme list in site-form.tsx

src/server/index.tsx

@@ -1,4 +1,5 @@
 import express from "express";
+import fs from "fs";
 import { IncomingHttpHeaders } from "http";
 import { Helmet } from "inferno-helmet";
 import { matchPath, StaticRouter } from "inferno-router";
@@ -23,6 +24,8 @@ const server = express();
 const [hostname, port] = process.env["LEMMY_UI_HOST"]
   ? process.env["LEMMY_UI_HOST"].split(":")
   : ["0.0.0.0", "1234"];
+const extraThemesFolder =
+  process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
 
 server.use(express.json());
 server.use(express.urlencoded({ extended: false }));
@@ -46,6 +49,54 @@ server.get("/robots.txt", async (_req, res) => {
   res.send(robotstxt);
 });
 
+server.get("/css/themes/:name", async (req, res) => {
+  res.contentType("text/css");
+  const theme = req.params.name;
+  if (!theme.endsWith(".min.css")) {
+    res.send("Theme must be a css file");
+  }
+
+  const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
+  if (fs.existsSync(customTheme)) {
+    res.sendFile(customTheme);
+  } else {
+    const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
+    res.sendFile(internalTheme);
+  }
+});
+
+function buildThemeList(): string[] {
+  let themes = [
+    "litera",
+    "materia",
+    "minty",
+    "solar",
+    "united",
+    "cyborg",
+    "darkly",
+    "journal",
+    "sketchy",
+    "vaporwave",
+    "vaporwave-dark",
+    "i386",
+    "litely",
+    "nord",
+  ];
+  if (fs.existsSync(extraThemesFolder)) {
+    let dirThemes = fs.readdirSync(extraThemesFolder);
+    let minCssThemes = dirThemes
+      .filter(d => d.endsWith(".min.css"))
+      .map(d => d.replace(".min.css", ""));
+    themes.push(...minCssThemes);
+  }
+  return themes;
+}
+
+server.get("/css/themelist", async (_req, res) => {
+  res.type("json");
+  res.send(JSON.stringify(buildThemeList()));
+});
+
 // server.use(cookieParser());
 server.get("/*", async (req, res) => {
   try {

src/shared/components/app/theme.tsx

@@ -18,7 +18,7 @@ export class Theme extends Component<Props> {
           <link
             rel="stylesheet"
             type="text/css"
-            href={`/static/assets/css/themes/${user.local_user_view.local_user.theme}.min.css`}
+            href={`css/themes/${user.local_user_view.local_user.theme}.min.css`}
           />
         </Helmet>
       );
@@ -28,7 +28,7 @@ export class Theme extends Component<Props> {
           <link
             rel="stylesheet"
             type="text/css"
-            href={`/static/assets/css/themes/${this.props.defaultTheme}.min.css`}
+            href={`/css/themes/${this.props.defaultTheme}.min.css`}
           />
         </Helmet>
       );
@@ -39,7 +39,7 @@ export class Theme extends Component<Props> {
           <link
             rel="stylesheet"
             type="text/css"
-            href="/static/assets/css/themes/litely.min.css"
+            href="/css/themes/litely.min.css"
             id="default-light"
             media="(prefers-color-scheme: light)"
           />
@@ -47,7 +47,7 @@ export class Theme extends Component<Props> {
           <link
             rel="stylesheet"
             type="text/css"
-            href="/static/assets/css/themes/darkly.min.css"
+            href="/css/themes/darkly.min.css"
             id="default-dark"
             media="(prefers-color-scheme: no-preference), (prefers-color-scheme: dark)"
           />

src/shared/components/home/site-form.tsx

@@ -6,7 +6,7 @@ import { WebSocketService } from "../../services";
 import {
   authField,
   capitalizeFirstLetter,
-  themes,
+  fetchThemeList,
   wsClient,
 } from "../../utils";
 import { Spinner } from "../common/icon";
@@ -21,6 +21,7 @@ interface SiteFormProps {
 interface SiteFormState {
   siteForm: EditSite;
   loading: boolean;
+  themeList: string[];
 }
 
 export class SiteForm extends Component<SiteFormProps, SiteFormState> {
@@ -40,6 +41,7 @@ export class SiteForm extends Component<SiteFormProps, SiteFormState> {
       auth: authField(),
     },
     loading: false,
+    themeList: [],
   };
 
   constructor(props: any, context: any) {
@@ -78,6 +80,11 @@ export class SiteForm extends Component<SiteFormProps, SiteFormState> {
     }
   }
 
+  async componentDidMount() {
+    this.state.themeList = await fetchThemeList();
+    this.setState(this.state);
+  }
+
   // Necessary to stop the loading
   componentWillReceiveProps() {
     this.state.loading = false;
@@ -336,7 +343,7 @@ export class SiteForm extends Component<SiteFormProps, SiteFormState> {
                 class="custom-select w-auto"
               >
                 <option value="browser">{i18n.t("browser_default")}</option>
-                {themes.map(theme => (
+                {this.state.themeList.map(theme => (
                   <option value={theme}>{theme}</option>
                 ))}
               </select>

src/shared/components/person/settings.tsx

@@ -29,6 +29,7 @@ import {
   debounce,
   elementUrl,
   fetchCommunities,
+  fetchThemeList,
   fetchUsers,
   getLanguages,
   isBrowser,
@@ -39,7 +40,6 @@ import {
   setTheme,
   setupTippy,
   showLocal,
-  themes,
   toast,
   updateCommunityBlock,
   updatePersonBlock,
@@ -78,6 +78,7 @@ interface SettingsState {
   blockCommunity?: CommunityView;
   currentTab: string;
   siteRes: GetSiteResponse;
+  themeList: string[];
 }
 
 export class Settings extends Component<any, SettingsState> {
@@ -109,6 +110,7 @@ export class Settings extends Component<any, SettingsState> {
     blockCommunityId: 0,
     currentTab: "settings",
     siteRes: this.isoData.site_res,
+    themeList: [],
   };
 
   constructor(props: any, context: any) {
@@ -131,8 +133,10 @@ export class Settings extends Component<any, SettingsState> {
     this.setUserInfo();
   }
 
-  componentDidMount() {
+  async componentDidMount() {
     setupTippy();
+    this.state.themeList = await fetchThemeList();
+    this.setState(this.state);
   }
 
   componentWillUnmount() {
@@ -545,7 +549,7 @@ export class Settings extends Component<any, SettingsState> {
                   {i18n.t("theme")}
                 </option>
                 <option value="browser">{i18n.t("browser_default")}</option>
-                {themes.map(theme => (
+                {this.state.themeList.map(theme => (
                   <option value={theme}>{theme}</option>
                 ))}
               </select>

src/shared/utils.ts

@@ -77,23 +77,6 @@ export const mentionDropdownFetchLimit = 10;
 
 export const relTags = "noopener nofollow";
 
-export const themes = [
-  "litera",
-  "materia",
-  "minty",
-  "solar",
-  "united",
-  "cyborg",
-  "darkly",
-  "journal",
-  "sketchy",
-  "vaporwave",
-  "vaporwave-dark",
-  "i386",
-  "litely",
-  "nord",
-];
-
 const DEFAULT_ALPHABET =
   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
 
@@ -365,7 +348,11 @@ function getBrowserLanguages(): string[] {
   return allowedLangs;
 }
 
-export function setTheme(theme: string, forceReload = false) {
+export async function fetchThemeList(): Promise<string[]> {
+  return fetch("/css/themelist").then(res => res.json());
+}
+
+export async function setTheme(theme: string, forceReload = false) {
   if (!isBrowser()) {
     return;
   }
@@ -377,9 +364,11 @@ export function setTheme(theme: string, forceReload = false) {
     theme = "darkly";
   }
 
+  let themeList = await fetchThemeList();
+
   // Unload all the other themes
-  for (var i = 0; i < themes.length; i++) {
+  for (var i = 0; i < themeList.length; i++) {
-    let styleSheet = document.getElementById(themes[i]);
+    let styleSheet = document.getElementById(themeList[i]);
     if (styleSheet) {
       styleSheet.setAttribute("disabled", "disabled");
     }
@@ -391,7 +380,8 @@ export function setTheme(theme: string, forceReload = false) {
   document.getElementById("default-dark")?.setAttribute("disabled", "disabled");
 
   // Load the theme dynamically
-  let cssLoc = `/static/assets/css/themes/${theme}.min.css`;
+  let cssLoc = `/css/themes/${theme}.min.css`;
+
   loadCss(theme, cssLoc);
   document.getElementById(theme).removeAttribute("disabled");
 }