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<template> |
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<div ref="containerRef" class="ivyforms-safe-html"></div> |
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</template> |
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|
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<script setup lang="ts"> |
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import { ref, onMounted, watch, nextTick } from 'vue' |
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import DOMPurify, { type Config } from 'dompurify' |
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|
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interface Props { |
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html: string |
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fieldType?: string |
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allowedTags?: string[] |
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allowedAttributes?: Record<string, string[]> |
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} |
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|
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const props = withDefaults(defineProps<Props>(), { |
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fieldType: 'unknown', |
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allowedTags: undefined, |
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allowedAttributes: undefined, |
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}) |
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|
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const containerRef = ref<HTMLDivElement>() |
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|
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/** |
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* Get DOMPurify configuration based on field type |
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*/ |
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const getDOMPurifyConfig = (): Config => { |
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const baseConfig: Config = { |
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RETURN_DOM_FRAGMENT: false, |
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RETURN_DOM: false, |
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ALLOWED_URI_REGEXP: |
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/^(?:(?:(?:f|ht)tps?|mailto|tel|callto|sms|cid|xmpp|data):|[^a-z]|[a-z+.-]+(?:[^a-z+.-:]|$))/i, |
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} |
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|
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// Field-specific configurations |
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switch (props.fieldType) { |
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case 'signature': |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: ['img'], |
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ALLOWED_ATTR: ['src', 'alt', 'style', 'class', 'width', 'height'], |
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ALLOWED_URI_REGEXP: /^data:image\/(png|jpeg|jpg|gif|svg\+xml);base64,/i, |
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} |
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|
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case 'confirmation': |
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// For confirmation messages that may contain signature images and formatted text |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: [ |
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'p', |
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'br', |
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'strong', |
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'b', |
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'em', |
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'i', |
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'u', |
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'a', |
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'ul', |
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'ol', |
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'li', |
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'span', |
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'div', |
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'img', // Allow images for signatures |
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'h1', |
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'h2', |
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'h3', |
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'h4', |
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'h5', |
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'h6', |
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'blockquote', |
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], |
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ALLOWED_ATTR: ['href', 'target', 'rel', 'class', 'style', 'src', 'alt', 'width', 'height'], |
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ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|tel|data):)/i, // Allow data URIs for signature images |
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// Allow all CSS in style attributes |
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ALLOW_UNKNOWN_PROTOCOLS: false, |
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SANITIZE_DOM: true, |
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} |
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|
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case 'rich-text': |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: [ |
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'p', |
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'br', |
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'strong', |
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'b', |
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'em', |
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'i', |
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'u', |
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'a', |
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'ul', |
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'ol', |
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'li', |
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'h1', |
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'h2', |
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'h3', |
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'h4', |
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'h5', |
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'h6', |
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'blockquote', |
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'code', |
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'pre', |
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'span', |
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'div', |
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], |
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ALLOWED_ATTR: ['href', 'target', 'rel', 'class', 'style'], |
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} |
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|
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case 'chart': |
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case 'visualization': |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: ['div', 'svg', 'canvas', 'img'], |
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ALLOWED_ATTR: ['class', 'style', 'width', 'height', 'viewBox', 'src', 'alt', 'data-*'], |
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} |
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|
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default: |
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// Custom configuration if provided |
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if (props.allowedTags || props.allowedAttributes) { |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: props.allowedTags, |
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ALLOWED_ATTR: props.allowedAttributes |
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? Object.values(props.allowedAttributes).flat() |
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: undefined, |
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} |
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} |
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|
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// Fallback: very restrictive |
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return { |
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...baseConfig, |
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ALLOWED_TAGS: ['span', 'div'], |
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ALLOWED_ATTR: ['class'], |
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} |
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} |
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} |
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|
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/** |
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* Sanitize HTML using DOMPurify with field-specific configuration |
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*/ |
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const sanitizeHTML = (html: string): string => { |
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if (!html || typeof html !== 'string') { |
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return '' |
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} |
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|
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const config = getDOMPurifyConfig() |
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|
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try { |
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// Store original style attributes to preserve them |
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const styleMap = new Map<Element, string>() |
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|
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// Hook to save original style attributes before DOMPurify processes them |
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DOMPurify.addHook('beforeSanitizeAttributes', (node) => { |
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if (node instanceof Element && node.hasAttribute('style')) { |
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const originalStyle = node.getAttribute('style') |
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if (originalStyle) { |
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styleMap.set(node, originalStyle) |
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} |
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} |
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}) |
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|
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// Hook to restore original style attributes after DOMPurify sanitizes |
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DOMPurify.addHook('afterSanitizeAttributes', (node) => { |
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if (node instanceof Element && styleMap.has(node)) { |
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const originalStyle = styleMap.get(node) |
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if (originalStyle) { |
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// Restore the original style attribute |
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// This preserves all CSS including rgb(), rgba(), etc. |
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node.setAttribute('style', originalStyle) |
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} |
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} |
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}) |
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|
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// Sanitize the HTML |
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const clean = DOMPurify.sanitize(html, { |
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...config, |
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// Allow data URIs and other safe protocols |
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ALLOW_DATA_ATTR: true, |
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// Keep comments for debugging (optional) |
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KEEP_CONTENT: true, |
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// Allow all CSS in style attributes |
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WHOLE_DOCUMENT: false, |
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// Force body context |
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FORCE_BODY: true, |
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}) as string |
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|
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// Clean up hooks after sanitization |
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DOMPurify.removeHook('beforeSanitizeAttributes') |
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DOMPurify.removeHook('afterSanitizeAttributes') |
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|
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return clean |
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} catch (error) { |
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console.error('SafeHTML: Error sanitizing HTML:', error) |
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DOMPurify.removeAllHooks() |
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return '' |
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} |
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} |
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|
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/** |
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* Render sanitized HTML into the container |
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*/ |
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const renderHTML = () => { |
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if (!containerRef.value) return |
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|
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const sanitized = sanitizeHTML(props.html) |
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|
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// Set the sanitized HTML |
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containerRef.value.innerHTML = sanitized |
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} |
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|
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// Render on mount and when HTML changes |
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onMounted(() => { |
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nextTick(() => { |
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renderHTML() |
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}) |
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}) |
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|
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watch( |
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() => props.html, |
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() => { |
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nextTick(() => { |
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renderHTML() |
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}) |
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}, |
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) |
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</script> |
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|
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<style scoped lang="scss"> |
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.ivyforms-safe-html { |
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// Base styles for sanitized HTML content |
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|
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:deep(img) { |
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max-width: 100%; |
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height: auto; |
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display: block; |
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} |
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|
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:deep(a) { |
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color: var(--map-base-brand-symbol-0); |
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text-decoration: none; |
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|
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&:hover { |
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text-decoration: underline; |
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} |
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} |
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|
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:deep(code) { |
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background-color: var(--map-base-dusk-o05); |
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padding: 2px 6px; |
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border-radius: 4px; |
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font-family: monospace; |
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font-size: 0.9em; |
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} |
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|
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:deep(pre) { |
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background-color: var(--map-base-dusk-o05); |
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padding: 12px; |
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border-radius: 8px; |
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overflow-x: auto; |
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|
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code { |
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background: none; |
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padding: 0; |
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} |
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} |
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|
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:deep(blockquote) { |
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border-left: 4px solid var(--map-base-dusk-stroke-0); |
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padding-left: 12px; |
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margin: 8px 0; |
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color: var(--map-base-text-1); |
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} |
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} |
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</style> |
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|
