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[github/Chocobozzz/PeerTube.git] / client / src / app / shared / renderer / markdown.service.ts
1 import { Injectable } from '@angular/core'
2
3 import { MarkdownIt } from 'markdown-it'
4
5 @Injectable()
6 export class MarkdownService {
7 static TEXT_RULES = [
8 'linkify',
9 'autolink',
10 'emphasis',
11 'link',
12 'newline',
13 'list'
14 ]
15 static ENHANCED_RULES = MarkdownService.TEXT_RULES.concat([ 'image' ])
16 static COMPLETE_RULES = MarkdownService.ENHANCED_RULES.concat([ 'block', 'inline', 'heading', 'html_inline', 'html_block', 'paragraph' ])
17
18 private textMarkdownIt: MarkdownIt
19 private enhancedMarkdownIt: MarkdownIt
20 private completeMarkdownIt: MarkdownIt
21
22 async textMarkdownToHTML (markdown: string) {
23 if (!markdown) return ''
24
25 if (!this.textMarkdownIt) {
26 this.textMarkdownIt = await this.createMarkdownIt(MarkdownService.TEXT_RULES)
27 }
28
29 const html = this.textMarkdownIt.render(markdown)
30 return this.avoidTruncatedTags(html)
31 }
32
33 async enhancedMarkdownToHTML (markdown: string) {
34 if (!markdown) return ''
35
36 if (!this.enhancedMarkdownIt) {
37 this.enhancedMarkdownIt = await this.createMarkdownIt(MarkdownService.ENHANCED_RULES)
38 }
39
40 const html = this.enhancedMarkdownIt.render(markdown)
41 return this.avoidTruncatedTags(html)
42 }
43
44 async completeMarkdownToHTML (markdown: string) {
45 if (!markdown) return ''
46
47 if (!this.completeMarkdownIt) {
48 this.completeMarkdownIt = await this.createMarkdownIt(MarkdownService.COMPLETE_RULES, true)
49 }
50
51 const html = this.completeMarkdownIt.render(markdown)
52 return this.avoidTruncatedTags(html)
53 }
54
55 private async createMarkdownIt (rules: string[], html = false) {
56 // FIXME: import('...') returns a struct module, containing a "default" field corresponding to our sanitizeHtml function
57 const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default
58
59 const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: true, html })
60
61 for (const rule of rules) {
62 markdownIt.enable(rule)
63 }
64
65 this.setTargetToLinks(markdownIt)
66
67 return markdownIt
68 }
69
70 private setTargetToLinks (markdownIt: MarkdownIt) {
71 // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer
72 const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) {
73 return self.renderToken(tokens, idx, options)
74 }
75
76 markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) {
77 const token = tokens[index]
78
79 const targetIndex = token.attrIndex('target')
80 if (targetIndex < 0) token.attrPush([ 'target', '_blank' ])
81 else token.attrs[targetIndex][1] = '_blank'
82
83 const relIndex = token.attrIndex('rel')
84 if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ])
85 else token.attrs[relIndex][1] = 'noopener noreferrer'
86
87 // pass token to default renderer.
88 return defaultRender(tokens, index, options, env, self)
89 }
90 }
91
92 private avoidTruncatedTags (html: string) {
93 return html.replace(/\*\*?([^*]+)$/, '$1')
94 .replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...')
95 .replace(/\[[^\]]+\]?\(?([^\)]+)$/, '$1')
96
97 }
98 }