stac-node-validator/src/loader/node.js

STAC Validator for NodeJS

const axios = require('axios');
const fs = require('fs-extra');
const { isHttpUrl } = require('../utils');

async function loader(uri) {
  if (isHttpUrl(uri)) {
    const response = await axios.get(uri);
    return response.data;
  } else {
    if (await fs.exists(uri)) {
      return JSON.parse(await fs.readFile(uri, 'utf8'));
    } else {
      const url = URL.parse(uri);
      // url.protocol.length > 2 check that it's not a Windows path, e.g. c: as in c://foo/bar
      if (url && url.protocol && url.protocol.length > 2 && url.protocol !== 'file:') {
        throw new Error(`Protocol not supported: ${url.protocol}`);
      } else {
        throw new Error(`File not found: ${uri}`);
      }
    }
  }
}

module.exports = loader;