@indiekit/endpoint-micropub/lib/post-type-discovery.js

Micropub endpoint for Indiekit. Enables publishing content to your website using the Micropub protocol.

/**
 * Accepts a JF2 object and attempts to determine the post type
 * @param {object} postTypes - Configured post types
 * @param {object} properties - JF2 properties
 * @returns {string|null} The post type or null if unknown
 * @see {@link https://ptd.spec.indieweb.org/#algorithm}
 */
export const getPostType = (postTypes, properties) => {
  const propertiesMap = new Map(Object.entries(properties));

  // If post has the event type, it’s an event
  if (properties.type && properties.type === "event") {
    return properties.type;
  }

  const basePostTypes = new Map([
    ["rsvp", "rsvp"],
    ["repost", "repost-of"],
    ["like", "like-of"],
    ["reply", "in-reply-to"],
    ["video", "video"],
    ["photo", "photo"],
  ]);

  // Types defined in Post Type Discovery specification

  // Types defined in post type configuration
  for (const [type, { discovery }] of Object.entries(postTypes)) {
    if (!discovery) {
      continue;
    }

    basePostTypes.set(type, discovery);
  }

  for (const basePostType of basePostTypes) {
    if (propertiesMap.has(basePostType[1])) {
      return basePostType[0];
    }
  }

  // If has `children` property that is populated, is collection type
  if (
    properties.children &&
    Array.isArray(properties.children) &&
    properties.children.length > 0
  ) {
    return "collection";
  }

  // Use summary value for content if no content value
  let content;
  if (propertiesMap.has("content")) {
    content =
      properties.content.text || properties.content.html || properties.content;
  } else if (propertiesMap.has("summary")) {
    content = properties.summary;
  }

  // If post has `name` and content, it’s an article
  // This is a deviation from the Post Type Algorithm, which identifies a post
  // as a note if the content is prefixed with the `name` value.
  if (properties.name && content) {
    return "article";
  }

  return "note";
};