LibWeb: Add two more scheme helpers to the Fetch infrastructure

Userland/Libraries/LibWeb/Fetch/Infrastructure/URL.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -15,4 +16,18 @@ bool is_local_url(AK::URL const& url)
     return any_of(LOCAL_SCHEMES, [&](auto scheme) { return url.scheme() == scheme; });
 }
 
+// https://fetch.spec.whatwg.org/#fetch-scheme
+bool is_fetch_scheme(StringView scheme)
+{
+    // A fetch scheme is "about", "blob", "data", "file", or an HTTP(S) scheme.
+    return any_of(FETCH_SCHEMES, [&](auto fetch_scheme) { return scheme == fetch_scheme; });
+}
+
+// https://fetch.spec.whatwg.org/#http-scheme
+bool is_http_or_https_scheme(StringView scheme)
+{
+    // An HTTP(S) scheme is "http" or "https".
+    return any_of(HTTP_SCHEMES, [&](auto http_scheme) { return scheme == http_scheme; });
+}
+
 }

Userland/Libraries/LibWeb/Fetch/Infrastructure/URL.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2022, Andreas Kling <linusg@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -30,5 +31,7 @@ inline constexpr Array FETCH_SCHEMES = {
 };
 
 [[nodiscard]] bool is_local_url(AK::URL const&);
+[[nodiscard]] bool is_fetch_scheme(StringView);
+[[nodiscard]] bool is_http_or_https_scheme(StringView);
 
 }