import * as MarkdownIt from 'markdown-it' import { Injectable } from '@angular/core' import { buildVideoLink, decorateVideoLink } from '@shared/core-utils' import { COMPLETE_RULES, ENHANCED_RULES, ENHANCED_WITH_HTML_RULES, TEXT_RULES, TEXT_WITH_HTML_RULES } from '@shared/core-utils/renderer/markdown' import { HtmlRendererService } from './html-renderer.service' type MarkdownParsers = { textMarkdownIt: MarkdownIt textWithHTMLMarkdownIt: MarkdownIt enhancedMarkdownIt: MarkdownIt enhancedWithHTMLMarkdownIt: MarkdownIt unsafeMarkdownIt: MarkdownIt customPageMarkdownIt: MarkdownIt } type MarkdownConfig = { rules: string[] html: boolean breaks: boolean escape?: boolean } type MarkdownParserConfigs = { [id in keyof MarkdownParsers]: MarkdownConfig } @Injectable() export class MarkdownService { private markdownParsers: MarkdownParsers = { textMarkdownIt: null, textWithHTMLMarkdownIt: null, enhancedMarkdownIt: null, enhancedWithHTMLMarkdownIt: null, unsafeMarkdownIt: null, customPageMarkdownIt: null } private parsersConfig: MarkdownParserConfigs = { textMarkdownIt: { rules: TEXT_RULES, breaks: true, html: false }, textWithHTMLMarkdownIt: { rules: TEXT_WITH_HTML_RULES, breaks: true, html: true, escape: true }, enhancedMarkdownIt: { rules: ENHANCED_RULES, breaks: true, html: false }, enhancedWithHTMLMarkdownIt: { rules: ENHANCED_WITH_HTML_RULES, breaks: true, html: true, escape: true }, unsafeMarkdownIt: { rules: COMPLETE_RULES, breaks: true, html: true, escape: false }, customPageMarkdownIt: { rules: COMPLETE_RULES, breaks: false, html: true, escape: true } } private emojiModule: any constructor (private htmlRenderer: HtmlRendererService) {} textMarkdownToHTML (options: { markdown: string withHtml?: boolean // default false withEmoji?: boolean // default false }) { const { markdown, withHtml = false, withEmoji = false } = options if (withHtml) return this.render({ name: 'textWithHTMLMarkdownIt', markdown, withEmoji }) return this.render({ name: 'textMarkdownIt', markdown, withEmoji }) } enhancedMarkdownToHTML (options: { markdown: string withHtml?: boolean // default false withEmoji?: boolean // default false }) { const { markdown, withHtml = false, withEmoji = false } = options if (withHtml) return this.render({ name: 'enhancedWithHTMLMarkdownIt', markdown, withEmoji }) return this.render({ name: 'enhancedMarkdownIt', markdown, withEmoji }) } markdownToUnsafeHTML (options: { markdown: string }) { return this.render({ name: 'unsafeMarkdownIt', markdown: options.markdown, withEmoji: true }) } customPageMarkdownToHTML (options: { markdown: string additionalAllowedTags: string[] }) { const { markdown, additionalAllowedTags } = options return this.render({ name: 'customPageMarkdownIt', markdown, withEmoji: true, additionalAllowedTags }) } // --------------------------------------------------------------------------- processVideoTimestamps (videoShortUUID: string, html: string) { return html.replace(/((\d{1,2}):)?(\d{1,2}):(\d{1,2})/g, function (str, _, h, m, s) { const t = (3600 * +(h || 0)) + (60 * +(m || 0)) + (+(s || 0)) const url = decorateVideoLink({ url: buildVideoLink({ shortUUID: videoShortUUID }), startTime: t }) // Sync class name with timestamp-route-transformer directive return `${str}` }) } private async render (options: { name: keyof MarkdownParsers markdown: string withEmoji: boolean additionalAllowedTags?: string[] }) { const { name, markdown, withEmoji, additionalAllowedTags } = options if (!markdown) return '' const config = this.parsersConfig[name] if (!this.markdownParsers[name]) { this.markdownParsers[name] = await this.createMarkdownIt(config) if (withEmoji) { if (!this.emojiModule) { this.emojiModule = (await import('markdown-it-emoji/light')).default } this.markdownParsers[name].use(this.emojiModule) } } let html = this.markdownParsers[name].render(markdown) html = this.avoidTruncatedTags(html) if (config.escape) return this.htmlRenderer.toSafeHtml(html, additionalAllowedTags) return html } private async createMarkdownIt (config: MarkdownConfig) { // FIXME: import('...') returns a struct module, containing a "default" field const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: config.breaks, html: config.html }) for (const rule of config.rules) { markdownIt.enable(rule) } this.setTargetToLinks(markdownIt) return markdownIt } private setTargetToLinks (markdownIt: MarkdownIt) { // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { return self.renderToken(tokens, idx, options) } markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) { const token = tokens[index] const targetIndex = token.attrIndex('target') if (targetIndex < 0) token.attrPush([ 'target', '_blank' ]) else token.attrs[targetIndex][1] = '_blank' const relIndex = token.attrIndex('rel') if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ]) else token.attrs[relIndex][1] = 'noopener noreferrer' // pass token to default renderer.* return defaultRender(tokens, index, options, env, self) } } private avoidTruncatedTags (html: string) { return html.replace(/\*\*?([^*]+)$/, '$1') .replace(/]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...') .replace(/\[[^\]]+\]\(([^)]+)$/m, '$1') .replace(/\s?\[[^\]]+\]?[.]{3}<\/p>$/m, '...

') } }