graphbrainz/src/extensions/mediawiki/resolvers.js

A GraphQL schema, Express server, and middleware for querying the MusicBrainz.

async function resolveMediaWikiImages(source, args, { loaders }) {
  const isURL = (relation) => relation['target-type'] === 'url';
  let rels = source.relations ? source.relations.filter(isURL) : [];
  if (!rels.length) {
    rels = await loaders.lookup
      .load([source._type, source.id, { inc: 'url-rels' }])
      .then((source) => source.relations.filter(isURL));
  }
  const pages = rels
    .filter((rel) => {
      if (rel.type === args.type) {
        const url = new URL(rel.url.resource);
        if (url.pathname.match(/^\/wiki\/(File|Image):/)) {
          return true;
        }
      }
      return false;
    })
    .map((rel) => rel.url.resource);
  return Promise.all(pages.map((page) => loaders.mediaWiki.load(page)));
}

export default {
  MediaWikiImage: {
    descriptionURL: (imageInfo) => imageInfo.descriptionurl,
    canonicalTitle: (imageInfo) => imageInfo.canonicaltitle,
    objectName: (imageInfo) => {
      const data = imageInfo.extmetadata.ObjectName;
      return data ? data.value : null;
    },
    descriptionHTML: (imageInfo) => {
      const data = imageInfo.extmetadata.ImageDescription;
      return data ? data.value : null;
    },
    originalDateTimeHTML: (imageInfo) => {
      const data = imageInfo.extmetadata.DateTimeOriginal;
      return data ? data.value : null;
    },
    categories: (imageInfo) => {
      const data = imageInfo.extmetadata.Categories;
      return data ? data.value.split('|') : [];
    },
    artistHTML: (imageInfo) => {
      const data = imageInfo.extmetadata.Artist;
      return data ? data.value : null;
    },
    creditHTML: (imageInfo) => {
      const data = imageInfo.extmetadata.Credit;
      return data ? data.value : null;
    },
    licenseShortName: (imageInfo) => {
      const data = imageInfo.extmetadata.LicenseShortName;
      return data ? data.value : null;
    },
    licenseURL: (imageInfo) => {
      const data = imageInfo.extmetadata.LicenseUrl;
      return data ? data.value : null;
    },
    metadata: (imageInfo) =>
      Object.keys(imageInfo.extmetadata).map((key) => {
        const data = imageInfo.extmetadata[key];
        return { ...data, name: key };
      }),
  },
  MediaWikiImageMetadata: {
    value: (obj) => (obj.value == null ? obj.value : `${obj.value}`),
  },
  Artist: {
    mediaWikiImages: resolveMediaWikiImages,
  },
  Instrument: {
    mediaWikiImages: resolveMediaWikiImages,
  },
  Label: {
    mediaWikiImages: resolveMediaWikiImages,
  },
  Place: {
    mediaWikiImages: resolveMediaWikiImages,
  },
};