Implement shared HTML sanitization configuration
**Backend Changes:** - Add html-sanitization-config.json with allowedTags, allowedAttributes, and allowedCssProperties - Create HtmlSanitizationConfigDto for configuration data transfer - Update HtmlSanitizationService to load configuration from JSON file with fallback - Add HtmlSanitizationController with public API endpoint at /api/config/html-sanitization - Update SecurityConfig to allow public access to /api/config/** endpoints **Frontend Changes:** - Add configApi.getHtmlSanitizationConfig() to fetch backend configuration - Create sanitization.ts utility with sanitizeHtml() and sanitizeHtmlSync() functions - Update story reading page to use shared sanitization configuration - Add preloadSanitizationConfig() for early configuration loading - Handle TrustedHTML type conversion and DOMPurify config compatibility **Benefits:** - Consistent HTML sanitization rules between frontend and backend - Centralized configuration in JSON file for easy maintenance - Automatic fallback to safe defaults if configuration loading fails - API-driven approach allows runtime configuration updates - Maintains security while providing flexibility for content formatting Resolves HTML sanitization inconsistencies and provides foundation for configurable content safety rules. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Stefan Hardegger
166
frontend/src/lib/sanitization.ts
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166
frontend/src/lib/sanitization.ts
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import DOMPurify from 'dompurify';
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import { configApi } from './api';
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interface SanitizationConfig {
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allowedTags: string[];
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allowedAttributes: Record<string, string[]>;
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allowedCssProperties: string[];
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removedAttributes: Record<string, string[]>;
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description: string;
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}
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let cachedConfig: SanitizationConfig | null = null;
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let configPromise: Promise<SanitizationConfig> | null = null;
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/**
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* Fetch sanitization configuration from backend
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*/
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async function fetchSanitizationConfig(): Promise<SanitizationConfig> {
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if (cachedConfig) {
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return cachedConfig;
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}
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if (configPromise) {
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return configPromise;
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}
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configPromise = configApi.getHtmlSanitizationConfig()
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.then(config => {
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cachedConfig = config;
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configPromise = null;
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return config;
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})
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.catch(error => {
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console.error('Failed to fetch sanitization config, using fallback:', error);
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configPromise = null;
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// Return fallback configuration
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const fallbackConfig: SanitizationConfig = {
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allowedTags: [
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'p', 'br', 'div', 'span', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
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'b', 'strong', 'i', 'em', 'u', 's', 'strike', 'del', 'ins',
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'sup', 'sub', 'small', 'big', 'mark', 'pre', 'code',
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'ul', 'ol', 'li', 'dl', 'dt', 'dd', 'a',
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'table', 'thead', 'tbody', 'tfoot', 'tr', 'th', 'td', 'caption',
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'blockquote', 'cite', 'q', 'hr'
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],
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allowedAttributes: {
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'p': ['class', 'style'],
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'div': ['class', 'style'],
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'span': ['class', 'style'],
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'h1': ['class', 'style'],
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'h2': ['class', 'style'],
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'h3': ['class', 'style'],
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'h4': ['class', 'style'],
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'h5': ['class', 'style'],
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'h6': ['class', 'style'],
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'a': ['class'],
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'table': ['class'],
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'td': ['class', 'colspan', 'rowspan'],
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'th': ['class', 'colspan', 'rowspan']
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},
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allowedCssProperties: [
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'color', 'background-color', 'font-size', 'font-weight',
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'font-style', 'text-align', 'text-decoration', 'margin',
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'padding', 'text-indent', 'line-height'
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],
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removedAttributes: {
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'a': ['href', 'target']
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},
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description: 'Fallback sanitization configuration'
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};
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cachedConfig = fallbackConfig;
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return fallbackConfig;
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});
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return configPromise;
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}
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/**
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* Create DOMPurify configuration from backend sanitization config
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*/
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function createDOMPurifyConfig(config: SanitizationConfig) {
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const allowedTags = config.allowedTags;
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const allowedAttributes: Record<string, string[]> = { ...config.allowedAttributes };
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// Remove attributes that should be stripped (like href from links)
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if (config.removedAttributes) {
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Object.keys(config.removedAttributes).forEach(tag => {
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const attributesToRemove = config.removedAttributes[tag];
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if (allowedAttributes[tag]) {
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allowedAttributes[tag] = allowedAttributes[tag].filter(
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attr => !attributesToRemove.includes(attr)
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);
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}
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});
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}
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return {
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ALLOWED_TAGS: allowedTags,
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ALLOWED_ATTR: Object.keys(allowedAttributes).reduce((acc: string[], tag) => {
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return [...acc, ...allowedAttributes[tag]];
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}, []),
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// Allow style attribute but sanitize CSS properties
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ALLOW_UNKNOWN_PROTOCOLS: false,
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SANITIZE_DOM: true,
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KEEP_CONTENT: true,
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// Custom hook to sanitize style attributes
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ALLOW_DATA_ATTR: false,
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} as DOMPurify.Config;
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}
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/**
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* Sanitize HTML content using shared configuration from backend
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*/
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export async function sanitizeHtml(html: string): Promise<string> {
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if (!html || html.trim() === '') {
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return '';
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}
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try {
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const config = await fetchSanitizationConfig();
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const domPurifyConfig = createDOMPurifyConfig(config);
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// Configure DOMPurify with our settings
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const cleanHtml = DOMPurify.sanitize(html, domPurifyConfig as any);
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return cleanHtml.toString();
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} catch (error) {
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console.error('Error during HTML sanitization:', error);
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// Fallback to basic DOMPurify sanitization
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return DOMPurify.sanitize(html).toString();
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}
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}
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/**
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* Synchronous sanitization using cached config (for cases where async is not possible)
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* Falls back to basic DOMPurify if no config is cached
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*/
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export function sanitizeHtmlSync(html: string): string {
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if (!html || html.trim() === '') {
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return '';
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}
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if (cachedConfig) {
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const domPurifyConfig = createDOMPurifyConfig(cachedConfig);
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return DOMPurify.sanitize(html, domPurifyConfig as any).toString();
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}
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// Fallback to basic DOMPurify
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console.warn('No cached sanitization config available, using DOMPurify defaults');
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return DOMPurify.sanitize(html).toString();
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}
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/**
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* Preload sanitization configuration (call early in app lifecycle)
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*/
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export function preloadSanitizationConfig(): Promise<SanitizationConfig> {
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return fetchSanitizationConfig();
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}
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/**
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* Clear cached configuration (useful for testing or config updates)
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*/
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export function clearSanitizationCache(): void {
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cachedConfig = null;
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configPromise = null;
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}
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