83 lines
2.4 KiB
TypeScript
83 lines
2.4 KiB
TypeScript
/**
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* Card normalizer:
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* Converts API cards into our internal format.
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* @see {@link https://docs.joinmastodon.org/entities/card/}
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*/
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import punycode from 'punycode';
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import { Record as ImmutableRecord, Map as ImmutableMap, fromJS } from 'immutable';
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// https://docs.joinmastodon.org/entities/card/
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export const CardRecord = ImmutableRecord({
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author_name: '',
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author_url: '',
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blurhash: null as string | null,
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description: '',
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embed_url: '',
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height: 0,
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html: '',
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image: null as string | null,
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provider_name: '',
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provider_url: '',
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title: '',
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type: 'link',
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url: '',
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width: 0,
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});
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const IDNA_PREFIX = 'xn--';
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const decodeIDNA = (domain: string): string => {
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return domain
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.split('.')
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.map(part => part.indexOf(IDNA_PREFIX) === 0 ? punycode.decode(part.slice(IDNA_PREFIX.length)) : part)
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.join('.');
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};
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const getHostname = (url: string): string => {
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const parser = document.createElement('a');
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parser.href = url;
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return parser.hostname;
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};
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/** Fall back to Pleroma's OG data */
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const normalizeWidth = (card: ImmutableMap<string, any>) => {
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const width = card.get('width') || card.getIn(['pleroma', 'opengraph', 'width']) || 0;
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return card.set('width', width);
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};
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/** Fall back to Pleroma's OG data */
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const normalizeHeight = (card: ImmutableMap<string, any>) => {
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const height = card.get('height') || card.getIn(['pleroma', 'opengraph', 'height']) || 0;
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return card.set('height', height);
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};
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/** Fall back to Pleroma's OG data */
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const normalizeHtml = (card: ImmutableMap<string, any>) => {
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const html = card.get('html') || card.getIn(['pleroma', 'opengraph', 'html']) || '';
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return card.set('html', html);
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};
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/** Fall back to Pleroma's OG data */
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const normalizeImage = (card: ImmutableMap<string, any>) => {
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const image = card.get('image') || card.getIn(['pleroma', 'opengraph', 'thumbnail_url']) || null;
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return card.set('image', image);
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};
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/** Set provider from URL if not found */
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const normalizeProviderName = (card: ImmutableMap<string, any>) => {
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const providerName = card.get('provider_name') || decodeIDNA(getHostname(card.get('url')));
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return card.set('provider_name', providerName);
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};
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export const normalizeCard = (card: Record<string, any>) => {
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return CardRecord(
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ImmutableMap(fromJS(card)).withMutations(card => {
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normalizeWidth(card);
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normalizeHeight(card);
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normalizeHtml(card);
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normalizeImage(card);
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normalizeProviderName(card);
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}),
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);
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};
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