LibWeb/CSP: Implement the webrtc directive

Author: https://github.com/Lubrsi
Commit: a5e2fd2e12
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5765

Libraries/LibWeb/ContentSecurityPolicy/Directives/WebRTCDirective.cpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2024, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/ContentSecurityPolicy/Directives/WebRTCDirective.h>
+#include <LibWeb/Infra/Strings.h>
+
+namespace Web::ContentSecurityPolicy::Directives {
+
+GC_DEFINE_ALLOCATOR(WebRTCDirective);
+
+WebRTCDirective::WebRTCDirective(String name, Vector<String> value)
+    : Directive(move(name), move(value))
+{
+}
+
+// https://w3c.github.io/webappsec-csp/#webrtc-pre-connect
+Directive::Result WebRTCDirective::webrtc_pre_connect_check(GC::Ref<Policy const>) const
+{
+    // 1. If this directive’s value contains a single item which is an ASCII case-insensitive match for the string
+    //    "'allow'", return "Allowed".
+    if (value().size() == 1 && value().first().equals_ignoring_ascii_case("'allow'"sv))
+        return Result::Allowed;
+
+    // 2. Return "Blocked".
+    return Result::Blocked;
+}
+
+}