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1 | import { Injectable } from '@angular/core' | |
2 | import { MarkdownIt } from 'markdown-it' | |
3 | import { buildVideoLink } from '../../../assets/player/utils' | |
4 | import { HtmlRendererService } from '@app/shared/renderer/html-renderer.service' | |
5 | ||
6 | type MarkdownParsers = { | |
7 | textMarkdownIt: MarkdownIt | |
8 | textWithHTMLMarkdownIt: MarkdownIt | |
9 | ||
10 | enhancedMarkdownIt: MarkdownIt | |
11 | enhancedWithHTMLMarkdownIt: MarkdownIt | |
12 | ||
13 | completeMarkdownIt: MarkdownIt | |
14 | } | |
15 | ||
16 | type MarkdownConfig = { | |
17 | rules: string[] | |
18 | html: boolean | |
19 | escape?: boolean | |
20 | } | |
21 | ||
22 | type MarkdownParserConfigs = { | |
23 | [id in keyof MarkdownParsers]: MarkdownConfig | |
24 | } | |
25 | ||
26 | @Injectable() | |
27 | export class MarkdownService { | |
28 | static TEXT_RULES = [ | |
29 | 'linkify', | |
30 | 'autolink', | |
31 | 'emphasis', | |
32 | 'link', | |
33 | 'newline', | |
34 | 'list' | |
35 | ] | |
36 | static TEXT_WITH_HTML_RULES = MarkdownService.TEXT_RULES.concat([ 'html_inline', 'html_block' ]) | |
37 | ||
38 | static ENHANCED_RULES = MarkdownService.TEXT_RULES.concat([ 'image' ]) | |
39 | static ENHANCED_WITH_HTML_RULES = MarkdownService.TEXT_WITH_HTML_RULES.concat([ 'image' ]) | |
40 | ||
41 | static COMPLETE_RULES = MarkdownService.ENHANCED_WITH_HTML_RULES.concat([ 'block', 'inline', 'heading', 'paragraph' ]) | |
42 | ||
43 | private markdownParsers: MarkdownParsers = { | |
44 | textMarkdownIt: null, | |
45 | textWithHTMLMarkdownIt: null, | |
46 | enhancedMarkdownIt: null, | |
47 | enhancedWithHTMLMarkdownIt: null, | |
48 | completeMarkdownIt: null | |
49 | } | |
50 | private parsersConfig: MarkdownParserConfigs = { | |
51 | textMarkdownIt: { rules: MarkdownService.TEXT_RULES, html: false }, | |
52 | textWithHTMLMarkdownIt: { rules: MarkdownService.TEXT_WITH_HTML_RULES, html: true, escape: true }, | |
53 | ||
54 | enhancedMarkdownIt: { rules: MarkdownService.ENHANCED_RULES, html: false }, | |
55 | enhancedWithHTMLMarkdownIt: { rules: MarkdownService.ENHANCED_WITH_HTML_RULES, html: true, escape: true }, | |
56 | ||
57 | completeMarkdownIt: { rules: MarkdownService.COMPLETE_RULES, html: true } | |
58 | } | |
59 | ||
60 | constructor (private htmlRenderer: HtmlRendererService) {} | |
61 | ||
62 | textMarkdownToHTML (markdown: string, withHtml = false) { | |
63 | if (withHtml) return this.render('textWithHTMLMarkdownIt', markdown) | |
64 | ||
65 | return this.render('textMarkdownIt', markdown) | |
66 | } | |
67 | ||
68 | enhancedMarkdownToHTML (markdown: string, withHtml = false) { | |
69 | if (withHtml) return this.render('enhancedWithHTMLMarkdownIt', markdown) | |
70 | ||
71 | return this.render('enhancedMarkdownIt', markdown) | |
72 | } | |
73 | ||
74 | completeMarkdownToHTML (markdown: string) { | |
75 | return this.render('completeMarkdownIt', markdown) | |
76 | } | |
77 | ||
78 | private async render (name: keyof MarkdownParsers, markdown: string) { | |
79 | if (!markdown) return '' | |
80 | ||
81 | const config = this.parsersConfig[ name ] | |
82 | if (!this.markdownParsers[ name ]) { | |
83 | this.markdownParsers[ name ] = await this.createMarkdownIt(config) | |
84 | } | |
85 | ||
86 | let html = this.markdownParsers[ name ].render(markdown) | |
87 | html = this.avoidTruncatedTags(html) | |
88 | ||
89 | if (config.escape) return this.htmlRenderer.toSafeHtml(html) | |
90 | ||
91 | return html | |
92 | } | |
93 | ||
94 | async processVideoTimestamps (html: string) { | |
95 | return html.replace(/((\d{1,2}):)?(\d{1,2}):(\d{1,2})/g, function (str, _, h, m, s) { | |
96 | const t = (3600 * +(h || 0)) + (60 * +(m || 0)) + (+(s || 0)) | |
97 | const url = buildVideoLink({ startTime: t }) | |
98 | return `<a href="${url}">${str}</a>` | |
99 | }) | |
100 | } | |
101 | ||
102 | private async createMarkdownIt (config: MarkdownConfig) { | |
103 | // FIXME: import('...') returns a struct module, containing a "default" field corresponding to our sanitizeHtml function | |
104 | const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default | |
105 | ||
106 | const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: true, html: config.html }) | |
107 | ||
108 | for (const rule of config.rules) { | |
109 | markdownIt.enable(rule) | |
110 | } | |
111 | ||
112 | this.setTargetToLinks(markdownIt) | |
113 | ||
114 | return markdownIt | |
115 | } | |
116 | ||
117 | private setTargetToLinks (markdownIt: MarkdownIt) { | |
118 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer | |
119 | const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { | |
120 | return self.renderToken(tokens, idx, options) | |
121 | } | |
122 | ||
123 | markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) { | |
124 | const token = tokens[index] | |
125 | ||
126 | const targetIndex = token.attrIndex('target') | |
127 | if (targetIndex < 0) token.attrPush([ 'target', '_blank' ]) | |
128 | else token.attrs[targetIndex][1] = '_blank' | |
129 | ||
130 | const relIndex = token.attrIndex('rel') | |
131 | if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ]) | |
132 | else token.attrs[relIndex][1] = 'noopener noreferrer' | |
133 | ||
134 | // pass token to default renderer. | |
135 | return defaultRender(tokens, index, options, env, self) | |
136 | } | |
137 | } | |
138 | ||
139 | private avoidTruncatedTags (html: string) { | |
140 | return html.replace(/\*\*?([^*]+)$/, '$1') | |
141 | .replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...') | |
142 | .replace(/\[[^\]]+\]?\(?([^\)]+)$/, '$1') | |
143 | .replace(/\s?\[[^\]]+\]?[.]{3}<\/p>$/m, '...</p>') | |
144 | } | |
145 | } |