lbry-desktop/ui/component/fileThumbnail/view.jsx

// @flow
import type { Node } from 'react';
import { getThumbnailCdnUrl } from 'util/thumbnail';
import React from 'react';
import FreezeframeWrapper from './FreezeframeWrapper';
import Placeholder from './placeholder.png';
import classnames from 'classnames';
import useLazyLoading from 'effects/use-lazy-loading';

type Props = {
  uri: string,
  thumbnail: ?string, // externally sourced image
  children?: Node,
  allowGifs: boolean,
  claim: ?StreamClaim,
  doResolveUri: (string) => void,
  className?: string,
};

function FileThumbnail(props: Props) {
  const { claim, uri, doResolveUri, thumbnail: rawThumbnail, children, allowGifs = false, className } = props;
  const passedThumbnail = rawThumbnail && rawThumbnail.trim().replace(/^http:\/\//i, 'https://');
  const thumbnailFromClaim =
    uri && claim && claim.value && claim.value.thumbnail ? claim.value.thumbnail.url : undefined;
  const thumbnail = passedThumbnail || thumbnailFromClaim;
  const hasResolvedClaim = claim !== undefined;
  const thumbnailRef = React.useRef(null);

  React.useEffect(() => {
    if (!hasResolvedClaim && uri) {
      doResolveUri(uri);
    }
  }, [hasResolvedClaim, uri, doResolveUri]);

  useLazyLoading(thumbnailRef);

  if (!allowGifs && thumbnail && thumbnail.endsWith('gif')) {
    return (
      <FreezeframeWrapper src={thumbnail} className={classnames('media__thumb', className)}>
        {children}
      </FreezeframeWrapper>
    );
  }

  let url = thumbnail || (hasResolvedClaim ? Placeholder : '');
  // @if TARGET='web'
  // Pass image urls through a compression proxy
  if (thumbnail) {
    url = getThumbnailCdnUrl({ thumbnail });
  }
  // @endif

  const thumnailUrl = url ? url.replace(/'/g, "\\'") : '';

  return (
    <div
      ref={thumbnailRef}
      data-background-image={thumnailUrl}
      className={classnames('media__thumb', className, {
        'media__thumb--resolving': !hasResolvedClaim,
      })}
    >
      {children}
    </div>
  );
}

export default FileThumbnail;