LibWeb/CSP: Implement the media-src directive

Author: https://github.com/Lubrsi
Commit: 1b12aa4d8e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5308
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/ContentSecurityPolicy/Directives/MediaSourceDirective.cpp

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2024, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/ContentSecurityPolicy/Directives/DirectiveOperations.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/MediaSourceDirective.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/Names.h>
+#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
+
+namespace Web::ContentSecurityPolicy::Directives {
+
+GC_DEFINE_ALLOCATOR(MediaSourceDirective);
+
+MediaSourceDirective::MediaSourceDirective(String name, Vector<String> value)
+    : Directive(move(name), move(value))
+{
+}
+
+// https://w3c.github.io/webappsec-csp/#media-src-pre-request
+Directive::Result MediaSourceDirective::pre_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const> request, GC::Ref<Policy const> policy) const
+{
+    // 1. Let name be the result of executing § 6.8.1 Get the effective directive for request on request.
+    auto name = get_the_effective_directive_for_request(request);
+
+    // 2. If the result of executing § 6.8.4 Should fetch directive execute on name, media-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::MediaSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. If the result of executing § 6.7.2.5 Does request match source list? on request, this directive’s value,
+    //    and policy, is "Does Not Match", return "Blocked".
+    if (does_request_match_source_list(request, value(), policy) == MatchResult::DoesNotMatch)
+        return Result::Blocked;
+
+    // 4. Return "Allowed".
+    return Result::Allowed;
+}
+
+// https://w3c.github.io/webappsec-csp/#media-src-post-request
+Directive::Result MediaSourceDirective::post_request_check(GC::Heap&, GC::Ref<Fetch::Infrastructure::Request const> request, GC::Ref<Fetch::Infrastructure::Response const> response, GC::Ref<Policy const> policy) const
+{
+    // 1. Let name be the result of executing § 6.8.1 Get the effective directive for request on request.
+    auto name = get_the_effective_directive_for_request(request);
+
+    // 2. If the result of executing § 6.8.4 Should fetch directive execute on name, media-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::MediaSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. If the result of executing § 6.7.2.6 Does response to request match source list? on response, request, this
+    //    directive’s value, and policy, is "Does Not Match", return "Blocked".
+    if (does_response_match_source_list(response, request, value(), policy) == MatchResult::DoesNotMatch)
+        return Result::Blocked;
+
+    // 4. Return "Allowed".
+    return Result::Allowed;
+}
+
+}