fix(node:http) Export `validateHeaderName` and `validateHeaderValue` functions (#22616)

Modify `_http_outgoing.ts` to support the extended signature of
`validateHeaderName()` used since node v19.5.0/v18.14.0 by adding the
`label` parameter. (see:
https://nodejs.org/api/http.html#httpvalidateheadernamename-label)

Making both validation functions accessible as public exports of
`node:http`

Fixes: #22614

5 files changed, 94 insertions, 16 deletions

diff --git a/ext/node/polyfills/_http_outgoing.ts b/ext/node/polyfills/_http_outgoing.ts
index 0cfc070e6..35526a303 100644
--- a/ext/node/polyfills/_http_outgoing.ts
+++ b/ext/node/polyfills/_http_outgoing.ts
@@ -820,21 +820,25 @@ Object.defineProperty(OutgoingMessage.prototype, "_headerNames", {
   ),
 });
 
-export const validateHeaderName = hideStackFrames((name) => {
-  if (typeof name !== "string" || !name || !checkIsHttpToken(name)) {
-    throw new ERR_INVALID_HTTP_TOKEN("Header name", name);
-  }
-});
+export const validateHeaderName = hideStackFrames(
+  (name: string, label?: string): void => {
+    if (typeof name !== "string" || !name || !checkIsHttpToken(name)) {
+      throw new ERR_INVALID_HTTP_TOKEN(label || "Header name", name);
+    }
+  },
+);
 
-export const validateHeaderValue = hideStackFrames((name, value) => {
-  if (value === undefined) {
-    throw new ERR_HTTP_INVALID_HEADER_VALUE(value, name);
-  }
-  if (checkInvalidHeaderChar(value)) {
-    debug('Header "%s" contains invalid characters', name);
-    throw new ERR_INVALID_CHAR("header content", name);
-  }
-});
+export const validateHeaderValue = hideStackFrames(
+  (name: string, value: string): void => {
+    if (value === undefined) {
+      throw new ERR_HTTP_INVALID_HEADER_VALUE(value, name);
+    }
+    if (checkInvalidHeaderChar(value)) {
+      debug('Header "%s" contains invalid characters', name);
+      throw new ERR_INVALID_CHAR("header content", name);
+    }
+  },
+);
 
 export function parseUniqueHeadersOption(headers) {
   if (!Array.isArray(headers)) {
diff --git a/ext/node/polyfills/http.ts b/ext/node/polyfills/http.ts
index bcbf6674f..933a8dbcd 100644
--- a/ext/node/polyfills/http.ts
+++ b/ext/node/polyfills/http.ts
@@ -38,6 +38,7 @@ import {
   OutgoingMessage,
   parseUniqueHeadersOption,
   validateHeaderName,
+  validateHeaderValue,
 } from "ext:deno_node/_http_outgoing.ts";
 import { ok as assert } from "node:assert";
 import { kOutHeaders } from "ext:deno_node/internal/http.ts";
@@ -1824,6 +1825,8 @@ export {
   METHODS,
   OutgoingMessage,
   STATUS_CODES,
+  validateHeaderName,
+  validateHeaderValue,
 };
 export default {
   Agent,
@@ -1840,4 +1843,6 @@ export default {
   ServerResponse,
   request,
   get,
+  validateHeaderName,
+  validateHeaderValue,
 };
diff --git a/tests/node_compat/config.jsonc b/tests/node_compat/config.jsonc
index d84cc4dd2..3fde8be5a 100644
--- a/tests/node_compat/config.jsonc
+++ b/tests/node_compat/config.jsonc
@@ -365,6 +365,7 @@
       // TODO(lev): ClientRequest.socket is not polyfilled so this test keeps
       //            failing
       //"test-http-client-set-timeout.js",
+      "test-http-header-validators.js",
       "test-http-localaddress.js",
       // TODO(bartlomieju): temporarily disabled while we iterate on the HTTP client
       // "test-http-outgoing-buffer.js",
diff --git a/tests/node_compat/test/parallel/test-http-header-validators.js b/tests/node_compat/test/parallel/test-http-header-validators.js
new file mode 100644
index 000000000..2b2f82339
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-http-header-validators.js
@@ -0,0 +1,69 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+require('../common');
+const assert = require('assert');
+const { validateHeaderName, validateHeaderValue } = require('http');
+
+// Expected static methods
+isFunc(validateHeaderName, 'validateHeaderName');
+isFunc(validateHeaderValue, 'validateHeaderValue');
+
+// Expected to be useful as static methods
+console.log('validateHeaderName');
+// - when used with valid header names - should not throw
+[
+  'user-agent',
+  'USER-AGENT',
+  'User-Agent',
+  'x-forwarded-for',
+].forEach((name) => {
+  console.log('does not throw for "%s"', name);
+  validateHeaderName(name);
+});
+
+// - when used with invalid header names:
+[
+  'איקס-פורוורד-פור',
+  'x-forwarded-fםr',
+].forEach((name) => {
+  console.log('throws for: "%s"', name.slice(0, 50));
+  assert.throws(
+    () => validateHeaderName(name),
+    { code: 'ERR_INVALID_HTTP_TOKEN' }
+  );
+});
+
+console.log('validateHeaderValue');
+// - when used with valid header values - should not throw
+[
+  ['x-valid', 1],
+  ['x-valid', '1'],
+  ['x-valid', 'string'],
+].forEach(([name, value]) => {
+  console.log('does not throw for "%s"', name);
+  validateHeaderValue(name, value);
+});
+
+// - when used with invalid header values:
+[
+  // [header, value, expectedCode]
+  ['x-undefined', undefined, 'ERR_HTTP_INVALID_HEADER_VALUE'],
+  ['x-bad-char', 'לא תקין', 'ERR_INVALID_CHAR'],
+].forEach(([name, value, code]) => {
+  console.log('throws %s for: "%s: %s"', code, name, value);
+  assert.throws(
+    () => validateHeaderValue(name, value),
+    { code }
+  );
+});
+
+// Misc.
+function isFunc(v, ttl) {
+  assert.ok(v.constructor === Function, `${ttl} is expected to be a function`);
+}
diff --git a/tools/node_compat/TODO.md b/tools/node_compat/TODO.md
index eb288c65e..d47ba9d9d 100644
--- a/tools/node_compat/TODO.md
+++ b/tools/node_compat/TODO.md
@@ -3,7 +3,7 @@
 
 NOTE: This file should not be manually edited. Please edit `tests/node_compat/config.json` and run `deno task setup` in `tools/node_compat` dir instead.
 
-Total: 2999
+Total: 2998
 
 - [abort/test-abort-backtrace.js](https://github.com/nodejs/node/tree/v18.12.1/test/abort/test-abort-backtrace.js)
 - [abort/test-abort-fatal-error.js](https://github.com/nodejs/node/tree/v18.12.1/test/abort/test-abort-fatal-error.js)
@@ -1052,7 +1052,6 @@ Total: 2999
 - [parallel/test-http-header-overflow.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-header-overflow.js)
 - [parallel/test-http-header-owstext.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-header-owstext.js)
 - [parallel/test-http-header-read.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-header-read.js)
-- [parallel/test-http-header-validators.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-header-validators.js)
 - [parallel/test-http-hex-write.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-hex-write.js)
 - [parallel/test-http-highwatermark.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-highwatermark.js)
 - [parallel/test-http-host-header-ipv6-fail.js](https://github.com/nodejs/node/tree/v18.12.1/test/parallel/test-http-host-header-ipv6-fail.js)