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import Matcher from './Matcher'; import Filter from './Filter'; import ElementComponent from './components/Element'; import { FILTER_DENY, FILTER_CAST_NUMBER, FILTER_CAST_BOOL, TAGS, TAGS_BLACKLIST, ATTRIBUTES, ATTRIBUTES_TO_PROPS, TYPE_INLINE, TYPE_BLOCK, CONFIG_BLOCK, } from './constants'; import type { Attributes, PrimitiveType, ParsedNodes, NodeConfig, NodeInterface, ElementProps, } from './types'; const ELEMENT_NODE: number = 1; const TEXT_NODE: number = 3; const INVALID_ROOTS: string[] = ['!DOC', 'HTML', 'HEAD', 'BODY']; export default class Parser { doc: Document; content: ParsedNodes; props: Object; matchers: Matcher<*>[]; filters: Filter[]; keyIndex: number; constructor( markup: string, props: Object = {}, matchers: Matcher<*>[] = [], filters: Filter[] = [], ) { if (!markup) { markup = ''; } else if (typeof markup !== 'string') { throw new TypeError('Interweave parser requires a valid string.'); } this.props = props; this.matchers = matchers; this.filters = filters; this.keyIndex = -1; this.doc = this.createDocument(markup); } /** * Loop through and apply all registered attribute filters to the * provided value. */ applyFilters(attribute: string, value: string): string { return this.filters.reduce((newValue, filter) => ( (filter.attribute === attribute) ? filter.filter(newValue) : newValue ), value); } /** * Loop through and apply all registered matchers to the string. * If a match is found, create a React element, and build a new array. * This array allows React to interpolate and render accordingly. */ applyMatchers( string: string, parentConfig: NodeConfig, ): string | Array<string | React.Element<*>> { const elements = []; const props = this.props; let matchedString = string; let parts = {}; this.matchers.forEach((matcher: Matcher<*>) => { const tagName = matcher.asTag().toLowerCase(); const config = this.getTagConfig(tagName); // Skip matchers that have been disabled from props or are not supported if ( props[matcher.inverseName] || TAGS_BLACKLIST[tagName] || (!props.disableWhitelist && !TAGS[tagName]) ) { return; } // Skip matchers in which the child cannot be rendered if (!this.canRenderChild(parentConfig, config)) { return; } // Continuously trigger the matcher until no matches are found while (parts = matcher.match(matchedString)) { const { match, ...partProps } = parts; // Replace the matched portion with a placeholder matchedString = matchedString.replace(match, `#{{${elements.length}}}#`); // Create an element through the matchers factory this.keyIndex += 1; elements.push(matcher.createElement(match, { ...props, ...(partProps || {}), key: this.keyIndex, })); } }); if (!elements.length) { return matchedString; } // Deconstruct the string into an array so that React can render it const matchedArray = []; let lastIndex = 0; while (parts = matchedString.match(/#\{\{(\d+)\}\}#/)) { const no = parts[1]; // $FlowIssue https://github.com/facebook/flow/issues/2450 const index = parts.index; // Extract the previous string if (lastIndex !== index) { matchedArray.push(matchedString.substring(lastIndex, index)); } // Inject the element matchedArray.push(elements[parseInt(no, 10)]); // Set the next index lastIndex = index + parts[0].length; // Replace the token so it won't be matched again // And so that the string length doesn't change matchedString = matchedString.replace(`#{{${no}}}#`, `%{{${no}}}%`); } // Extra the remaining string if (lastIndex < matchedString.length) { matchedArray.push(matchedString.substring(lastIndex)); } return matchedArray; } /** * Determine whether the child can be rendered within the parent. */ canRenderChild(parentConfig: NodeConfig, childConfig: NodeConfig): boolean { if (!parentConfig.tagName || !childConfig.tagName) { return false; } // Valid children if ( parentConfig.children && parentConfig.children.length && parentConfig.children.indexOf(childConfig.tagName) === -1 ) { return false; } // Valid parent if ( childConfig.parent && childConfig.parent.length && childConfig.parent.indexOf(parentConfig.tagName) === -1 ) { return false; } // Self nesting if (!parentConfig.self && parentConfig.tagName === childConfig.tagName) { return false; } // Block if (!parentConfig.block && childConfig.type === TYPE_BLOCK) { return false; } // Inline if (!parentConfig.inline && childConfig.type === TYPE_INLINE) { return false; } return true; } /** * Convert line breaks in a string to HTML `<br/>` tags. * If the string contains HTML, we should not convert anything, * as line breaks should be handled by `<br/>`s in the markup itself. */ convertLineBreaks(markup: string): string { const { noHtml, disableLineBreaks } = this.props; if (noHtml || disableLineBreaks || markup.match(/<((?:\/[a-z ]+)|(?:[a-z ]+\/))>/ig)) { return markup; } // Replace carriage returns markup = markup.replace(/\r\n/g, '\n'); // Replace long line feeds markup = markup.replace(/\n{3,}/g, '\n\n\n'); // Replace line feeds with `<br/>`s markup = markup.replace(/\n/g, '<br/>'); return markup; } /** * Create a detached HTML document that allows for easy HTML * parsing while not triggering scripts or loading external * resources. */ createDocument(markup: string): Document { const doc = document.implementation.createHTMLDocument('Interweave'); if (INVALID_ROOTS.indexOf(markup.substr(1, 4).toUpperCase()) >= 0) { throw new Error('HTML documents as Interweave content are not supported.'); } else { // $FlowIssue Isn't null doc.body.innerHTML = this.convertLineBreaks(markup); } return doc; } /** * Convert an elements attribute map to an object map. * Returns null if no attributes are defined. */ extractAttributes(node: NodeInterface): ?Attributes { const { disableWhitelist } = this.props; const attributes = {}; let count = 0; if (node.nodeType !== ELEMENT_NODE || !node.attributes) { return null; } Array.from(node.attributes).forEach((attr: { name: string, value: string }) => { const name: string = attr.name.toLowerCase(); const value: string = attr.value; const filter: number = ATTRIBUTES[name]; // Verify the node is safe from attacks if (!this.isSafe(node)) { return; } // Do not allow blacklisted attributes excluding ARIA attributes // Do not allow events or XSS injections if (name.substr(0, 5) !== 'aria-') { if ( (!disableWhitelist && (!filter || filter === FILTER_DENY)) || name.match(/^on/) || value.replace(/(\s|\0|�(9|A|D);)/, '').match(/(javascript|vbscript|livescript|xss):/i) ) { return; } } // Apply filters let newValue: PrimitiveType = this.applyFilters(name, value); // Cast to boolean if (filter === FILTER_CAST_BOOL) { newValue = (newValue === 'true' || newValue === name); // Cast to number } else if (filter === FILTER_CAST_NUMBER) { newValue = parseFloat(newValue); // Cast to string } else { newValue = String(newValue); } attributes[ATTRIBUTES_TO_PROPS[name] || name] = newValue; count += 1; }); if (count === 0) { return null; } return attributes; } /** * Return configuration for a specific tag. * If no tag config exists, return a plain object. */ getTagConfig(tagName: string): NodeConfig { if (TAGS[tagName]) { return { ...TAGS[tagName], tagName, }; } return {}; } /** * Verify that a node is safe from XSS and injection attacks. */ isSafe(node: NodeInterface): boolean { Iif (!(node instanceof HTMLElement)) { return true; } // URLs should only support HTTP and email if ('href' in node) { const href = node.getAttribute('href'); // Fragment protocols start with about: // So let's just allow them if (href && href.charAt(0) === '#') { return true; } // $FlowIssue Protocol only exists for anchors const protocol = (node.protocol || '').toLowerCase(); return ( protocol === ':' || protocol === 'http:' || protocol === 'https:' || protocol === 'mailto:' ); } return true; } /** * Parse the markup by injecting it into a detached document, * while looping over all child nodes and generating an * array to interpolate into JSX. */ parse(): ParsedNodes { // $FlowIssue Body is not null! return this.parseNode(this.doc.body, { ...CONFIG_BLOCK, tagName: 'body', }); } /** * Loop over the nodes children and generate a * list of text nodes and React elements. */ parseNode(parentNode: NodeInterface, parentConfig: NodeConfig): ParsedNodes { const { noHtml, disableWhitelist } = this.props; let content = []; let mergedText = ''; Array.from(parentNode.childNodes).forEach((node: NodeInterface) => { // Create React elements from HTML elements if (node.nodeType === ELEMENT_NODE) { const tagName = node.nodeName.toLowerCase(); const config = this.getTagConfig(tagName); // Never allow these tags if (TAGS_BLACKLIST[tagName]) { return; } // Persist any previous text if (mergedText) { content.push(mergedText); mergedText = ''; } // Only render when the following criteria is met: // - HTML has not been disabled // - Whitelist is disabled OR the child is valid within the parent if (!noHtml && (disableWhitelist || this.canRenderChild(parentConfig, config))) { this.keyIndex += 1; // Build the props as it makes it easier to test const attributes = this.extractAttributes(node); const elementProps: ElementProps = { key: this.keyIndex, tagName, }; if (attributes) { elementProps.attributes = attributes; } if (config.void) { elementProps.selfClose = config.void; } content.push(( <ElementComponent {...elementProps}> {this.parseNode(node, config)} </ElementComponent> )); // Render the children of the current element only. // Important: If the current element is not whitelisted, // use the parent element for the next scope. } else { content = content.concat(this.parseNode(node, config.tagName ? config : parentConfig)); } // Apply matchers if a text node } else if (node.nodeType === TEXT_NODE) { const text = noHtml ? node.textContent : this.applyMatchers(node.textContent, parentConfig); if (Array.isArray(text)) { content = content.concat(text); } else { mergedText += text; } } }); if (mergedText) { content.push(mergedText); } return content; } } |