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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 (markdown: string, withHtml = false, withEmoji = false) {
if (withHtml) return this.render({ name: 'textWithHTMLMarkdownIt', markdown, withEmoji })
return this.render({ name: 'textMarkdownIt', markdown, withEmoji })
}
enhancedMarkdownToHTML (markdown: string, withHtml = false, withEmoji = false) {
if (withHtml) return this.render({ name: 'enhancedWithHTMLMarkdownIt', markdown, withEmoji })
return this.render({ name: 'enhancedMarkdownIt', markdown, withEmoji })
}
unsafeMarkdownToHTML (markdown: string, _trustedInput: true) {
return this.render({ name: 'unsafeMarkdownIt', markdown, withEmoji: true })
}
customPageMarkdownToHTML (markdown: string, additionalAllowedTags: string[]) {
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
})
return `<a class="video-timestamp" href="${url}">${str}</a>`
})
}
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(/\*\*?([^*]+)$/, '$1')
.replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...')
.replace(/\[[^\]]+\]\(([^\)]+)$/m, '$1')
.replace(/\s?\[[^\]]+\]?[.]{3}<\/p>$/m, '...</p>')
}
}
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