gatsby-source-filesystem/extend-file-node.js

Gatsby source plugin for building websites from local data. Markdown, JSON, images, YAML, CSV, and dozens of other data types supported.

"use strict";

const {
  GraphQLString
} = require(`gatsby/graphql`);
const fs = require(`fs-extra`);
const path = require(`path`);
const {
  prefixId,
  CODES
} = require(`./error-utils`);
module.exports = ({
  type,
  getNodeAndSavePathDependency,
  pathPrefix = ``,
  reporter
}) => {
  if (type.name !== `File`) {
    return {};
  }
  return {
    publicURL: {
      type: GraphQLString,
      args: {},
      description: `Copy file to static directory and return public url to it`,
      resolve: (file, fieldArgs, context) => {
        const details = getNodeAndSavePathDependency(file.id, context.path);
        const fileName = `${file.internal.contentDigest}/${details.base}`;
        const publicPath = path.join(process.cwd(), `public`, `static`, fileName);
        if (!fs.existsSync(publicPath)) {
          fs.copySync(details.absolutePath, publicPath, {
            dereference: true
          }, err => {
            if (err) {
              reporter.panic({
                id: prefixId(CODES.MissingResource),
                context: {
                  sourceMessage: `error copying file from ${details.absolutePath} to ${publicPath}`
                }
              }, err);
            }
          });
        }
        return `${pathPrefix}/static/${fileName}`;
      }
    }
  };
};