fix: dynamically load theme from API endpoint (#2688)

* dynamically load theme from API endpoint

* add documentation

docs/docs/documentation/getting-started/installation/backend-config.md

@@ -75,3 +75,24 @@ Changing the webworker settings may cause unforeseen memory leak issues with Mea
 | LDAP_ID_ATTRIBUTE    |   uid   | The LDAP attribute that maps to the user's id                                                                                       |
 | LDAP_NAME_ATTRIBUTE  |  name   | The LDAP attribute that maps to the user's name                                                                                     |
 | LDAP_MAIL_ATTRIBUTE  |  mail   | The LDAP attribute that maps to the user's email                                                                                    |
+
+### Themeing
+
+Setting the following environmental variables will change the theme of the frontend. Note that the themes are the same for all users. This is a break-change when migration from v0.x.x -> 1.x.x.
+
+| Variables             | Default | Description                 |
+| --------------------- | :-----: | --------------------------- |
+| THEME_LIGHT_PRIMARY   | #E58325 | Light Theme Config Variable |
+| THEME_LIGHT_ACCENT    | #007A99 | Light Theme Config Variable |
+| THEME_LIGHT_SECONDARY | #973542 | Light Theme Config Variable |
+| THEME_LIGHT_SUCCESS   | #43A047 | Light Theme Config Variable |
+| THEME_LIGHT_INFO      | #1976D2 | Light Theme Config Variable |
+| THEME_LIGHT_WARNING   | #FF6D00 | Light Theme Config Variable |
+| THEME_LIGHT_ERROR     | #EF5350 | Light Theme Config Variable |
+| THEME_DARK_PRIMARY    | #E58325 | Dark Theme Config Variable  |
+| THEME_DARK_ACCENT     | #007A99 | Dark Theme Config Variable  |
+| THEME_DARK_SECONDARY  | #973542 | Dark Theme Config Variable  |
+| THEME_DARK_SUCCESS    | #43A047 | Dark Theme Config Variable  |
+| THEME_DARK_INFO       | #1976D2 | Dark Theme Config Variable  |
+| THEME_DARK_WARNING    | #FF6D00 | Dark Theme Config Variable  |
+| THEME_DARK_ERROR      | #EF5350 | Dark Theme Config Variable  |

frontend/plugins/theme.ts

@@ -1,7 +1,60 @@
-import { Plugin } from "@nuxt/types"
+import { Plugin } from "@nuxt/types";
 
-const themePlugin: Plugin = ({ $vuetify, $config }) => {
-  $vuetify.theme.themes = $config.themes as typeof $vuetify.theme.themes
+export interface ThemeConfig {
+  lightPrimary: string;
+  lightAccent: string;
+  lightSecondary: string;
+  lightSuccess: string;
+  lightInfo: string;
+  lightWarning: string;
+  lightError: string;
+  darkPrimary: string;
+  darkAccent: string;
+  darkSecondary: string;
+  darkSuccess: string;
+  darkInfo: string;
+  darkWarning: string;
+  darkError: string;
+}
+
+let __cachedTheme: ThemeConfig | undefined;
+
+async function fetchTheme(): Promise<ThemeConfig | undefined> {
+  const route = "/api/app/about/theme";
+
+  try {
+    const response = await fetch(route);
+    const data = await response.json();
+    return data as ThemeConfig;
+  } catch (error) {
+    return undefined;
+  }
+}
+
+const themePlugin: Plugin =  async ({ $vuetify, $config }) => {
+  let theme = __cachedTheme;
+  if (!theme) {
+    theme = await fetchTheme();
+    __cachedTheme = theme;
+  }
+
+  if (theme) {
+    $vuetify.theme.themes.light.primary = theme.lightPrimary;
+    $vuetify.theme.themes.light.accent = theme.lightAccent;
+    $vuetify.theme.themes.light.secondary = theme.lightSecondary;
+    $vuetify.theme.themes.light.success = theme.lightSuccess;
+    $vuetify.theme.themes.light.info = theme.lightInfo;
+    $vuetify.theme.themes.light.warning = theme.lightWarning;
+    $vuetify.theme.themes.light.error = theme.lightError;
+
+    $vuetify.theme.themes.dark.primary = theme.darkPrimary;
+    $vuetify.theme.themes.dark.accent = theme.darkAccent;
+    $vuetify.theme.themes.dark.secondary = theme.darkSecondary;
+    $vuetify.theme.themes.dark.success = theme.darkSuccess;
+    $vuetify.theme.themes.dark.info = theme.darkInfo;
+    $vuetify.theme.themes.dark.warning = theme.darkWarning;
+    $vuetify.theme.themes.dark.error = theme.darkError;
+  }
 
   if ($config.useDark) {
     $vuetify.theme.dark = true;

mealie/core/settings/settings.py

@@ -3,6 +3,8 @@ from pathlib import Path
 
 from pydantic import BaseSettings, NoneStr, validator
 
+from mealie.core.settings.themes import Theme
+
 from .db_providers import AbstractDBProvider, db_provider_factory
 
 
@@ -23,6 +25,8 @@ def determine_secrets(data_dir: Path, production: bool) -> str:
 
 
 class AppSettings(BaseSettings):
+    theme: Theme = Theme()
+
     PRODUCTION: bool
     BASE_URL: str = "http://localhost:8080"
     """trailing slashes are trimmed (ex. `http://localhost:8080/` becomes ``http://localhost:8080`)"""

mealie/core/settings/themes.py

@@ -0,0 +1,22 @@
+from pydantic import BaseSettings
+
+
+class Theme(BaseSettings):
+    light_primary: str = "#E58325"
+    light_accent: str = "#007A99"
+    light_secondary: str = "#973542"
+    light_success: str = "#43A047"
+    light_info: str = "#1976D2"
+    light_warning: str = "#FF6D00"
+    light_error: str = "#EF5350"
+
+    dark_primary: str = "#E58325"
+    dark_accent: str = "#007A99"
+    dark_secondary: str = "#973542"
+    dark_success: str = "#43A047"
+    dark_info: str = "#1976D2"
+    dark_warning: str = "#FF6D00"
+    dark_error: str = "#EF5350"
+
+    class Config:
+        env_prefix = "theme_"

mealie/routes/app/app_about.py

@@ -1,8 +1,8 @@
-from fastapi import APIRouter
+from fastapi import APIRouter, Response
 
 from mealie.core.config import get_app_settings
 from mealie.core.settings.static import APP_VERSION
-from mealie.schema.admin.about import AppInfo
+from mealie.schema.admin.about import AppInfo, AppTheme
 
 router = APIRouter(prefix="/about")
 
@@ -18,3 +18,12 @@ def get_app_info():
         production=settings.PRODUCTION,
         allow_signup=settings.ALLOW_SIGNUP,
     )
+
+
+@router.get("/theme", response_model=AppTheme)
+def get_app_theme(resp: Response):
+    """Get's the current theme settings"""
+    settings = get_app_settings()
+
+    resp.headers["Cache-Control"] = "public, max-age=604800"
+    return AppTheme(**settings.theme.dict())

mealie/schema/admin/about.py

@@ -16,6 +16,24 @@ class AppInfo(MealieModel):
     allow_signup: bool
 
 
+class AppTheme(MealieModel):
+    light_primary: str = "#E58325"
+    light_accent: str = "#007A99"
+    light_secondary: str = "#973542"
+    light_success: str = "#43A047"
+    light_info: str = "#1976D2"
+    light_warning: str = "#FF6D00"
+    light_error: str = "#EF5350"
+
+    dark_primary: str = "#E58325"
+    dark_accent: str = "#007A99"
+    dark_secondary: str = "#973542"
+    dark_success: str = "#43A047"
+    dark_info: str = "#1976D2"
+    dark_warning: str = "#FF6D00"
+    dark_error: str = "#EF5350"
+
+
 class AdminAboutInfo(AppInfo):
     versionLatest: str
     api_port: int