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esm: support https remotely and http locally under flag · nodejs/node@ba639d0 · GitHub

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esm: support https remotely and http locally under flag
Co-authored-by: Jacob Smith <3012099+JakobJingleheimer@users.noreply.github.com> Co-authored-by: James M Snell <jasnell@gmail.com> Co-authored-by: Jordan Harband <ljharb@gmail.com> Co-authored-by: James Sumners <james@sumners.email> PR-URL: #36328 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
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‎doc/api/cli.md‎

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@@ -307,6 +307,16 @@ added: v9.0.0
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Specify the `module` of a custom experimental [ECMAScript module loader][].
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`module` may be any string accepted as an [`import` specifier][].
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### `--experimental-network-imports`
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<!-- YAML
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added: REPLACEME
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-->
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> Stability: 1 - Experimental
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Enable experimental support for the `https:` protocol in `import` specifiers.
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### `--experimental-policy`
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<!-- YAML
@@ -1572,6 +1582,7 @@ Node.js options that are allowed are:
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* `--experimental-json-modules`
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* `--experimental-loader`
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* `--experimental-modules`
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* `--experimental-network-imports`
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* `--experimental-policy`
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* `--experimental-specifier-resolution`
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* `--experimental-top-level-await`

‎doc/api/errors.md‎

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Used by the `Node-API` when `Constructor.prototype` is not an object.
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<a id="ERR_NETWORK_IMPORT_BAD_RESPONSE"></a>
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### `ERR_NETWORK_IMPORT_BAD_RESPONSE`
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> Stability: 1 - Experimental
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Response was received but was invalid when importing a module over the network.
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<a id="ERR_NETWORK_IMPORT_DISALLOWED"></a>
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### `ERR_NETWORK_IMPORT_DISALLOWED`
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> Stability: 1 - Experimental
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A network module attempted to load another module that it is not allowed to
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load. Likely this restriction is for security reasons.
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<a id="ERR_NO_LONGER_SUPPORTED"></a>
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### `ERR_NO_LONGER_SUPPORTED`

‎doc/api/esm.md‎

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@@ -601,6 +601,71 @@ spawn(execPath, [
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});
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```
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## HTTPS and HTTP imports
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> Stability: 1 - Experimental
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Importing network based modules using `https:` and `http:` is supported under
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the `--experimental-network-imports` flag. This allows web browser-like imports
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to work in Node.js with a few differences due to application stability and
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security concerns that are different when running in a privileged environment
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instead of a browser sandbox.
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### Imports are limited to HTTP/1
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Automatic protocol negotiation for HTTP/2 and HTTP/3 is not yet supported.
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### HTTP is limited to loopback addresses
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`http:` is vulnerable to man-in-the-middle attacks and is not allowed to be
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used for addresses outside of the IPv4 address `127.0.0.0/8` (`127.0.0.1` to
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`127.255.255.255`) and the IPv6 address `::1`. Support for `http:` is intended
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to be used for local development.
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### Authentication is never sent to the destination server.
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`Authorization`, `Cookie`, and `Proxy-Authorization` headers are not sent to the
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server. Avoid including user info in parts of imported URLs. A security model
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for safely using these on the server is being worked on.
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### CORS is never checked on the destination server
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CORS is designed to allow a server to limit the consumers of an API to a
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specific set of hosts. This is not supported as it does not make sense for a
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server-based implementation.
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### Cannot load non-network dependencies
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These modules cannot access other modules that are not over `http:` or `https:`.
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To still access local modules while avoiding the security concern, pass in
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references to the local dependencies:
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```mjs
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// file.mjs
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import worker_threads from 'worker_threads';
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import { configure, resize } from 'https://example.com/imagelib.mjs';
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configure({ worker_threads });
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```
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```mjs
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// https://example.com/imagelib.mjs
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let worker_threads;
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export function configure(opts) {
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worker_threads = opts.worker_threads;
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}
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export function resize(img, size) {
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// Perform resizing in worker_thread to avoid main thread blocking
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}
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```
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### Network-based loading is not enabled by default
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For now, the `--experimental-network-imports` flag is required to enable loading
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resources over `http:` or `https:`. In the future, a different mechanism will be
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used to enforce this. Opt-in is required to prevent transitive dependencies
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inadvertently using potentially mutable state that could affect reliability
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of Node.js applications.
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<i id="esm_experimental_loaders"></i>
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## Loaders

‎doc/node.1‎

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.Ar module
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to use as a custom module loader.
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.
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.It Fl -experimental-network-imports
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Enable experimental support for loading modules using `import` over `https:`.
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.
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.It Fl -experimental-policy
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Use the specified file as a security policy.
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.

‎lib/internal/errors.js‎

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@@ -1434,6 +1434,10 @@ E('ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT',
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'start offset of %s should be a multiple of %s', RangeError);
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E('ERR_NAPI_INVALID_TYPEDARRAY_LENGTH',
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'Invalid typed array length', RangeError);
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E('ERR_NETWORK_IMPORT_BAD_RESPONSE',
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"import '%s' received a bad response: %s", Error);
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E('ERR_NETWORK_IMPORT_DISALLOWED',
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"import of '%s' by %s is not supported: %s", Error);
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E('ERR_NO_CRYPTO',
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'Node.js is not compiled with OpenSSL crypto support', Error);
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E('ERR_NO_ICU',
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E('ERR_UNKNOWN_FILE_EXTENSION',
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'Unknown file extension "%s" for %s',
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TypeError);
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E('ERR_UNKNOWN_MODULE_FORMAT', 'Unknown module format: %s', RangeError);
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E('ERR_UNKNOWN_MODULE_FORMAT', 'Unknown module format: %s for URL %s',
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RangeError);
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E('ERR_UNKNOWN_SIGNAL', 'Unknown signal: %s', TypeError);
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E('ERR_UNSUPPORTED_DIR_IMPORT', "Directory import '%s' is not supported " +
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'resolving ES modules imported from %s', Error);
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E('ERR_UNSUPPORTED_ESM_URL_SCHEME', (url) => {
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let msg = 'Only file and data URLs are supported by the default ESM loader';
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E('ERR_UNSUPPORTED_ESM_URL_SCHEME', (url, supported) => {
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let msg = `Only URLs with a scheme in: ${ArrayPrototypeJoin(supported, ', ')} are supported by the default ESM loader`;
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if (isWindows && url.protocol.length === 2) {
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msg +=
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'. On Windows, absolute paths must be valid file:// URLs';

‎lib/internal/main/check_syntax.js‎

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});
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}
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function checkSyntax(source, filename) {
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async function checkSyntax(source, filename) {
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const { getOptionValue } = require('internal/options');
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let isModule = false;
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if (filename === '[stdin]' || filename === '[eval]') {
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isModule = getOptionValue('--input-type') === 'module';
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} else {
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const { defaultResolve } = require('internal/modules/esm/resolve');
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const { defaultGetFormat } = require('internal/modules/esm/get_format');
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const { url } = defaultResolve(pathToFileURL(filename).toString());
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const format = defaultGetFormat(url);
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const { url } = await defaultResolve(pathToFileURL(filename).toString());
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const format = await defaultGetFormat(url);
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isModule = format === 'module';
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}
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if (isModule) {

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