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'use strict';
const {
ArrayPrototypePush,
RegExpPrototypeExec,
decodeURIComponent,
} = primordials;
const { defaultGetFormat } = require('internal/modules/esm/get_format');
const { validateAssertions } = require('internal/modules/esm/assert');
const { getOptionValue } = require('internal/options');
const { fetchModule } = require('internal/modules/esm/fetch_module');
// Do not eagerly grab .manifest, it may be in TDZ
const policy = getOptionValue('--experimental-policy') ?
require('internal/process/policy') :
null;
const experimentalNetworkImports =
getOptionValue('--experimental-network-imports');
const { Buffer: { from: BufferFrom } } = require('buffer');
const { readFile: readFileAsync } = require('internal/fs/promises').exports;
const { URL } = require('internal/url');
const {
ERR_INVALID_URL,
ERR_UNSUPPORTED_ESM_URL_SCHEME,
} = require('internal/errors').codes;
const DATA_URL_PATTERN = /^[^/]+\/[^,;]+(?:[^,]*?)(;base64)?,([\s\S]*)$/;
async function getSource(url, context) {
const parsed = new URL(url);
let responseURL = url;
let source;
if (parsed.protocol === 'file:') {
source = await readFileAsync(parsed);
} else if (parsed.protocol === 'data:') {
const match = RegExpPrototypeExec(DATA_URL_PATTERN, parsed.pathname);
if (!match) {
throw new ERR_INVALID_URL(url);
}
const { 1: base64, 2: body } = match;
source = BufferFrom(decodeURIComponent(body), base64 ? 'base64' : 'utf8');
} else if (experimentalNetworkImports && (
parsed.protocol === 'https:' ||
parsed.protocol === 'http:'
)) {
const res = await fetchModule(parsed, context);
source = await res.body;
responseURL = res.resolvedHREF;
} else {
const supportedSchemes = ['file', 'data'];
if (experimentalNetworkImports) {
ArrayPrototypePush(supportedSchemes, 'http', 'https');
}
throw new ERR_UNSUPPORTED_ESM_URL_SCHEME(parsed, supportedSchemes);
}
if (policy?.manifest) {
policy.manifest.assertIntegrity(parsed, source);
}
return { responseURL, source };
}
/**
* Node.js default load hook.
* @param {string} url
* @param {object} context
* @returns {object}
*/
async function defaultLoad(url, context) {
let responseURL = url;
const { importAssertions } = context;
let {
format,
source,
} = context;
if (format == null) {
format = await defaultGetFormat(url, context);
}
validateAssertions(url, format, importAssertions);
if (
format === 'builtin' ||
format === 'commonjs'
) {
source = null;
} else if (source == null) {
({ responseURL, source } = await getSource(url, context));
}
return {
format,
responseURL,
source,
};
}
module.exports = {
defaultLoad,
};
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