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import type { ValueSanitizer } from 'roosterjs-content-model-types'; /** * @internal */ export const AllowedTags: ReadonlyArray<string> = [ 'a', 'abbr', 'address', 'area', 'article', 'aside', 'b', 'bdi', 'bdo', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'data', 'datalist', 'dd', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'em', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'img', 'input', 'ins', 'kbd', 'label', 'legend', 'li', 'main', 'map', 'mark', 'menu', 'menuitem', 'meter', 'nav', 'ol', 'optgroup', 'option', 'output', 'p', 'picture', 'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'section', 'select', 'small', 'span', 'strike', 'strong', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'time', 'tr', 'tt', 'u', 'ul', 'var', 'wbr', 'xmp', ]; /** * @internal */ export const DisallowedTags: ReadonlyArray<string> = [ 'applet', 'audio', 'base', 'basefont', 'embed', 'frame', 'frameset', 'iframe', 'link', 'meta', 'noscript', 'object', 'param', 'script', 'slot', 'source', 'style', 'template', 'title', 'track', 'video', ]; const VARIABLE_REGEX = /^\s*var\(\s*[a-zA-Z0-9-_]+\s*(,\s*(.*))?\)\s*$/; const VARIABLE_PREFIX = 'var('; const AllowedAttributes = [ 'accept', 'align', 'alt', 'checked', 'cite', 'class', 'color', 'cols', 'colspan', 'contextmenu', 'coords', 'datetime', 'default', 'dir', 'dirname', 'disabled', 'download', 'face', 'headers', 'height', 'hidden', 'high', 'href', 'hreflang', 'ismap', 'kind', 'label', 'lang', 'list', 'low', 'max', 'maxlength', 'media', 'min', 'multiple', 'open', 'optimum', 'pattern', 'placeholder', 'readonly', 'rel', 'required', 'reversed', 'rows', 'rowspan', 'scope', 'selected', 'shape', 'size', 'sizes', 'span', 'spellcheck', 'src', 'srclang', 'srcset', 'start', 'step', 'style', 'tabindex', 'target', 'title', 'translate', 'type', 'usemap', 'valign', 'value', 'width', 'wrap', 'bgColor', ]; const DefaultStyleValue: { [name: string]: string } = { 'background-color': 'transparent', 'border-bottom-color': 'rgb(0, 0, 0)', 'border-bottom-style': 'none', 'border-bottom-width': '0px', 'border-image-outset': '0', 'border-image-repeat': 'stretch', 'border-image-slice': '100%', 'border-image-source': 'none', 'border-image-width': '1', 'border-left-color': 'rgb(0, 0, 0)', 'border-left-style': 'none', 'border-left-width': '0px', 'border-right-color': 'rgb(0, 0, 0)', 'border-right-style': 'none', 'border-right-width': '0px', 'border-top-color': 'rgb(0, 0, 0)', 'border-top-style': 'none', 'border-top-width': '0px', 'outline-color': 'transparent', 'outline-style': 'none', 'outline-width': '0px', overflow: 'visible', '-webkit-text-stroke-width': '0px', 'word-wrap': 'break-word', 'margin-left': '0px', 'margin-right': '0px', padding: '0px', 'padding-top': '0px', 'padding-left': '0px', 'padding-right': '0px', 'padding-bottom': '0px', border: '0px', 'border-top': '0px', 'border-left': '0px', 'border-right': '0px', 'border-bottom': '0px', 'vertical-align': 'baseline', float: 'none', 'font-style': 'normal', 'font-variant-ligatures': 'normal', 'font-variant-caps': 'normal', 'font-weight': '400', 'letter-spacing': 'normal', orphans: '2', 'text-align': 'start', 'text-indent': '0px', 'text-transform': 'none', widows: '2', 'word-spacing': '0px', 'white-space': 'normal', }; /** * @internal */ export function sanitizeElement( element: HTMLElement, allowedTags: ReadonlyArray<string>, disallowedTags: ReadonlyArray<string>, styleSanitizers?: Readonly<Record<string, ValueSanitizer>>, attributeSanitizers?: Readonly<Record<string, ValueSanitizer>> ): HTMLElement | null { const tag = element.tagName.toLowerCase(); const sanitizedElement = disallowedTags.indexOf(tag) >= 0 ? null : createSanitizedElement( element.ownerDocument, allowedTags.indexOf(tag) >= 0 ? tag : 'span', element.attributes, styleSanitizers, attributeSanitizers ); if (sanitizedElement) { for (let child = element.firstChild; child; child = child.nextSibling) { const newChild = isNodeOfType(child, 'ELEMENT_NODE') ? sanitizeElement( child, allowedTags, disallowedTags, styleSanitizers, attributeSanitizers ) : isNodeOfType(child, 'TEXT_NODE') ? child.cloneNode() : null; if (newChild) { sanitizedElement?.appendChild(newChild); } } } return sanitizedElement; } /** * @internal */ export function createSanitizedElement( doc: Document, tag: string, attributes: NamedNodeMap, styleSanitizers?: Readonly<Record<string, ValueSanitizer>>, attributeSanitizers?: Readonly<Record<string, ValueSanitizer>> ): HTMLElement { const element = doc.createElement(tag); for (let i = 0; i < attributes.length; i++) { const attribute = attributes[i]; const name = attribute.name.toLowerCase().trim(); const value = attribute.value; const sanitizer = attributeSanitizers?.[name]; const newValue = name == 'style' ? processStyles(tag, value, styleSanitizers) : typeof sanitizer == 'function' ? sanitizer(value, tag) : typeof sanitizer === 'boolean' ? sanitizer ? value : null : AllowedAttributes.indexOf(name) >= 0 || name.indexOf('data-') == 0 ? value : null; if ( newValue !== null && newValue !== undefined && !newValue.match(/s\n*c\n*r\n*i\n*p\n*t\n*:/i) // match script: with any NewLine inside. Browser will ignore those NewLine char and still treat it as script prefix ) { element.setAttribute(name, newValue); } } return element; } function processStyles( tagName: string, value: string, styleSanitizers?: Readonly<Record<string, ValueSanitizer>> ) { const pairs = value.split(';'); const result: string[] = []; pairs.forEach(pair => { const valueIndex = pair.indexOf(':'); const name = pair.slice(0, valueIndex).trim(); let value: string = pair.slice(valueIndex + 1).trim(); if (name && value) { Iif (isCssVariable(value)) { value = processCssVariable(value); } const sanitizer = styleSanitizers?.[name]; const sanitizedValue = typeof sanitizer == 'function' ? sanitizer(value, tagName) : sanitizer === false ? null : value; if ( !!sanitizedValue && sanitizedValue != 'inherit' && sanitizedValue != 'initial' && sanitizedValue.indexOf('expression') < 0 && !name.startsWith('-') && DefaultStyleValue[name] != sanitizedValue ) { result.push(`${name}:${sanitizedValue}`); } } }); return result.join(';'); } function processCssVariable(value: string): string { const match = VARIABLE_REGEX.exec(value); return match?.[2] || ''; // Without fallback value, we don't know what does the original value mean, so ignore it } function isCssVariable(value: string): boolean { return value.indexOf(VARIABLE_PREFIX) == 0; } |