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/**
* Theme CSS loading utilities
*/
import { resolveThemeAppearance } from './appearance.js';
import { CSS_LINK_ID, DOM_SELECTORS } from './constants.js';
import { ThemeErrors, logThemeError } from './errors.js';
export interface ThemeInfo {
id: string;
cssFile: string;
icon?: string | undefined;
}
/**
* Resolves an asset path relative to the site's base URL.
*/
export function resolveAssetPath(assetPath: string, baseUrl: string): string {
// Normalize baseUrl - remove trailing slash if present, then add one
const normalizedBase = baseUrl.replace(/\/$/, '');
const base = normalizedBase ? `${window.location.origin}${normalizedBase}/` : `${window.location.origin}/`;
return new URL(assetPath, base).pathname;
}
/**
* Gets the base URL from the document's data-baseurl attribute.
* Validates the URL to prevent injection attacks:
* - Rejects protocol-relative URLs (//example.com)
* - Rejects non-HTTPS absolute URLs (except localhost)
* - Only allows same-origin or relative paths
*/
export function getBaseUrl(doc: Document): string {
const baseElement = doc.documentElement;
const raw = baseElement?.getAttribute('data-baseurl') || '';
// Empty base URL is valid (use site root)
if (!raw) return '';
// Reject protocol-relative URLs (security risk)
Iif (raw.startsWith('//')) {
logThemeError(ThemeErrors.PROTOCOL_REJECTED());
return '';
}
// Reject non-HTTPS absolute URLs (except localhost for development)
if (raw.startsWith('http://') && !raw.startsWith('http://localhost')) {
logThemeError(ThemeErrors.INSECURE_HTTP_REJECTED());
return '';
}
try {
// Parse relative to current origin to validate
const currentOrigin = typeof window !== 'undefined' ? window.location.origin : 'http://localhost';
const u = new URL(raw, currentOrigin);
// Only allow same-origin URLs or relative paths
Iif (u.origin !== currentOrigin) {
logThemeError(ThemeErrors.CROSS_ORIGIN_REJECTED(u.origin));
return '';
}
return u.pathname.replace(/\/$/, '');
} catch {
return '';
}
}
/**
* Builds the element ID of a theme's stylesheet link.
*
* Single source of truth for the `theme-<id>-css` convention shared by
* the loader and the lazy-CSS helpers.
*
* @param themeId - Theme whose stylesheet link ID to build
* @returns The stylesheet link element ID
*/
export function themeLinkId(themeId: string): string {
return `theme-${themeId}-css`;
}
/**
* Extracts the theme ID from a theme link element's ID.
* Strips a leading "theme-" prefix and trailing "-css" suffix.
*/
function extractThemeIdFromLinkId(linkId: string): string {
return linkId.replace(/^theme-/, '').replace(/-css$/, '');
}
/**
* Clears onload/onerror handlers from a link element to prevent memory leaks.
*/
function clearLinkHandlers(link: HTMLLinkElement): void {
link.onload = null;
link.onerror = null;
}
/**
* Loads a CSS file with a timeout, returning a promise that resolves when loaded.
*/
export function loadCSSWithTimeout(
link: HTMLLinkElement,
themeId: string,
timeoutMs = 10000
): Promise<void> {
return new Promise((resolve, reject) => {
const timeoutId = setTimeout(() => {
clearLinkHandlers(link);
reject(new Error(`Theme ${themeId} load timeout`));
}, timeoutMs);
link.onload = () => {
clearTimeout(timeoutId);
clearLinkHandlers(link);
resolve();
};
link.onerror = () => {
clearTimeout(timeoutId);
clearLinkHandlers(link);
reject(new Error(`Failed to load theme ${themeId}`));
};
});
}
/**
* Gets the current theme from document element classes
*/
export function getCurrentThemeFromClasses(element: HTMLElement): string | null {
const classList = Array.from(element.classList);
for (const className of classList) {
Eif (className.startsWith('theme-')) {
return className.substring(6); // Remove 'theme-' prefix
}
}
return null;
}
/**
* Applies theme class and root data attributes to the document element.
*/
export function applyThemeClass(doc: Document, themeId: string): void {
// Remove existing theme classes in a single batch operation
const themeClasses = Array.from(doc.documentElement.classList).filter((className) =>
className.startsWith('theme-'),
);
if (themeClasses.length > 0) {
doc.documentElement.classList.remove(...themeClasses);
}
// Add the new theme class
doc.documentElement.classList.add(`theme-${themeId}`);
doc.documentElement.setAttribute('data-theme', themeId);
doc.documentElement.setAttribute('data-appearance', resolveThemeAppearance(themeId));
}
/**
* Removes stale theme stylesheet links, keeping the given theme's link
* and the shared base stylesheet.
*/
function removeStaleThemeLinks(doc: Document, keepThemeId: string): void {
doc.querySelectorAll(DOM_SELECTORS.THEME_CSS_LINKS).forEach((link) => {
const linkThemeId = extractThemeIdFromLinkId(link.id);
if (linkThemeId !== keepThemeId && linkThemeId !== 'base') {
link.remove();
}
});
}
/**
* Adopts the blocking script's link element for a theme (prevents
* duplicate CSS loads).
*
* The repoint stays synchronous to preserve the blocking script's
* FOUC-avoidance behaviour; this only makes its outcome observable by
* awaiting the repointed link's load/error settlement. On load failure
* the link is rolled back to its previous identity and href so the
* document keeps the stylesheet that was already working.
*
* @returns true when the theme's CSS is confirmed loaded
*/
async function adoptBlockingLink(
doc: Document,
blockingLink: HTMLLinkElement,
theme: ThemeInfo,
baseUrl: string
): Promise<boolean> {
let resolvedHref: string;
try {
resolvedHref = resolveAssetPath(theme.cssFile, baseUrl);
} catch {
logThemeError(ThemeErrors.INVALID_CSS_PATH(theme.id));
return false;
}
const previousHref = blockingLink.getAttribute('href');
blockingLink.id = themeLinkId(theme.id);
blockingLink.setAttribute('data-theme-id', theme.id);
// Already pointing at the theme's stylesheet (e.g. the blocking script
// loaded it before first paint) — no fetch to await.
if (previousHref === resolvedHref) {
removeStaleThemeLinks(doc, theme.id);
return true;
}
blockingLink.href = resolvedHref;
try {
await loadCSSWithTimeout(blockingLink, theme.id);
} catch (error) {
// Loading failed — restore the link's prior identity and href so the
// previously working stylesheet stays in effect.
blockingLink.id = CSS_LINK_ID;
blockingLink.removeAttribute('data-theme-id');
if (previousHref !== null) {
blockingLink.href = previousHref;
} else {
blockingLink.removeAttribute('href');
}
logThemeError(ThemeErrors.CSS_LOAD_FAILED(theme.id, error));
return false;
}
removeStaleThemeLinks(doc, theme.id);
return true;
}
/**
* Loads theme CSS file if not already loaded.
*
* @returns true when the theme's stylesheet is present and confirmed
* loaded (or was already linked), false when path resolution or the
* network fetch failed
*/
export async function loadThemeCSS(
doc: Document,
theme: ThemeInfo,
baseUrl: string
): Promise<boolean> {
const linkId = themeLinkId(theme.id);
const existingThemeLink = doc.getElementById(linkId) as HTMLLinkElement | null;
if (existingThemeLink) {
// Link already exists — clean up any other stale theme links
removeStaleThemeLinks(doc, theme.id);
return true;
}
// Adopt the blocking script's link element if present (prevents duplicate CSS loads)
const blockingLink = doc.getElementById(CSS_LINK_ID) as HTMLLinkElement | null;
if (blockingLink) {
return adoptBlockingLink(doc, blockingLink, theme, baseUrl);
}
const themeLink = doc.createElement('link');
themeLink.id = linkId;
themeLink.rel = 'stylesheet';
themeLink.type = 'text/css';
themeLink.setAttribute('data-theme-id', theme.id);
try {
themeLink.href = resolveAssetPath(theme.cssFile, baseUrl);
} catch {
logThemeError(ThemeErrors.INVALID_CSS_PATH(theme.id));
return false;
}
doc.head.appendChild(themeLink);
try {
await loadCSSWithTimeout(themeLink, theme.id);
} catch (error) {
// Loading failed — remove the new link and keep prior theme intact
themeLink.remove();
logThemeError(ThemeErrors.CSS_LOAD_FAILED(theme.id, error));
return false;
}
// Only remove old theme links after successful load
removeStaleThemeLinks(doc, theme.id);
return true;
}
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