LibWeb: Implement EmbedderPolicy struct

Author: https://github.com/jamierocks
Commit: 190a419715
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/515
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/HTML/EmbedderPolicy.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/HTML/EmbedderPolicy.h>
+
+namespace Web::HTML {
+
+StringView embedder_policy_value_to_string(EmbedderPolicyValue embedder_policy_value)
+{
+    switch (embedder_policy_value) {
+    case EmbedderPolicyValue::UnsafeNone:
+        return "unsafe-none"sv;
+    case EmbedderPolicyValue::RequireCorp:
+        return "require-corp"sv;
+    case EmbedderPolicyValue::Credentialless:
+        return "credentialless"sv;
+    }
+    VERIFY_NOT_REACHED();
+}
+
+Optional<EmbedderPolicyValue> embedder_policy_value_from_string(StringView string)
+{
+    if (string.equals_ignoring_ascii_case("unsafe-none"sv))
+        return EmbedderPolicyValue::UnsafeNone;
+    if (string.equals_ignoring_ascii_case("require-corp"sv))
+        return EmbedderPolicyValue::RequireCorp;
+    if (string.equals_ignoring_ascii_case("credentialless"sv))
+        return EmbedderPolicyValue::Credentialless;
+    return {};
+}
+
+}