lbry-desktop/ui/component/common/markdown-preview.jsx

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// @flow
import * as React from 'react';
import remark from 'remark';
import remarkAttr from 'remark-attr';
import remarkStrip from 'strip-markdown';
import remarkEmoji from 'remark-emoji';
import reactRenderer from 'remark-react';
import ExternalLink from 'component/externalLink';
import defaultSchema from 'hast-util-sanitize/lib/github.json';
import { formatedLinks, inlineLinks } from 'util/remark-lbry';
import { Link } from 'react-router-dom';
import { formatLbryUrlForWeb } from 'util/url';
import EmbedPlayButton from 'component/embedPlayButton';
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type SimpleTextProps = {
children?: React.Node,
};
type SimpleLinkProps = {
href?: string,
title?: string,
children?: React.Node,
};
type MarkdownProps = {
strip?: boolean,
content: ?string,
promptLinks?: boolean,
};
const SimpleText = (props: SimpleTextProps) => {
return <span>{props.children}</span>;
};
const SimpleLink = (props: SimpleLinkProps) => {
const { title, children } = props;
const { href } = props;
if (!href) {
return children || null;
}
if (!href.startsWith('lbry://')) {
return (
<a href={href} title={title}>
{children}
</a>
);
}
const [uri, search] = href.split('?');
const urlParams = new URLSearchParams(search);
const embed = urlParams.get('embed');
if (embed) {
return <EmbedPlayButton uri={uri} />;
}
const webLink = formatLbryUrlForWeb(uri);
// using Link after formatLbryUrl to handle "/" vs "#/"
// for web and desktop scenarios respectively
return (
<Link
title={title}
to={webLink}
onClick={e => {
e.stopPropagation();
}}
>
{children}
</Link>
);
};
// Use github sanitation schema
const schema = { ...defaultSchema };
// Extend sanitation schema to support lbry protocol
schema.protocols.href.push('lbry');
schema.attributes.a.push('embed');
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const REPLACE_REGEX = /(<iframe\s+src=["'])(.*?(?=))(["']\s*><\/iframe>)/g;
const MarkdownPreview = (props: MarkdownProps) => {
const { content, strip, promptLinks } = props;
const strippedContent = content
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? content.replace(REPLACE_REGEX, (iframeHtml, y, iframeSrc) => {
// Let the browser try to create an iframe to see if the markup is valid
const outer = document.createElement('div');
outer.innerHTML = iframeHtml;
const iframe = ((outer.querySelector('iframe'): any): ?HTMLIFrameElement);
if (iframe) {
const src = iframe.src;
if (src && src.startsWith('lbry://')) {
return `${src}?embed=true`;
}
}
return iframeHtml;
})
: '';
const remarkOptions: Object = {
sanitize: schema,
fragment: React.Fragment,
remarkReactComponents: {
a: promptLinks ? ExternalLink : linkProps => <SimpleLink {...linkProps} />,
// Workaraund of remarkOptions.Fragment
div: React.Fragment,
},
};
const remarkAttrOpts = {
scope: 'extended',
elements: ['link'],
extend: { link: ['embed'] },
defaultValue: true,
};
// Strip all content and just render text
if (strip) {
// Remove new lines and extra space
remarkOptions.remarkReactComponents.p = SimpleText;
return (
<span className="markdown-preview">
{
remark()
.use(remarkStrip)
.use(reactRenderer, remarkOptions)
.processSync(content).contents
}
</span>
);
}
return (
<div className="markdown-preview">
{
remark()
.use(remarkAttr, remarkAttrOpts)
// Remark plugins for lbry urls
// Note: The order is important
.use(formatedLinks)
.use(inlineLinks)
// Emojis
.use(remarkEmoji)
.use(reactRenderer, remarkOptions)
.processSync(strippedContent).contents
}
</div>
);
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};
export default MarkdownPreview;