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const {
ArrayPrototypeConcat,
RegExpPrototypeExec,
decodeURIComponent,
} = primordials;
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 fs = require('internal/fs/promises').exports;
const { URL } = require('internal/url');
const {
ERR_INVALID_URL,
ERR_UNSUPPORTED_ESM_URL_SCHEME,
} = require('internal/errors').codes;
const readFileAsync = fs.readFile;
const DATA_URL_PATTERN = /^[^/]+\/[^,;]+(?:[^,]*?)(;base64)?,([\s\S]*)$/;
async function defaultGetSource(url, context, defaultGetSource) {
const parsed = new URL(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;
} else {
throw new ERR_UNSUPPORTED_ESM_URL_SCHEME(parsed, ArrayPrototypeConcat([
'file',
'data',
experimentalNetworkImports ? ['https', 'http'] : [],
]));
}
if (policy?.manifest) {
policy.manifest.assertIntegrity(parsed, source);
}
return source;
}
exports.defaultGetSource = defaultGetSource;
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