LibWeb/CSP: Implement the script-src directive

Author: https://github.com/Lubrsi
Commit: 0cff47828d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5328
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibWeb/ContentSecurityPolicy/Directives/ScriptSourceDirective.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2024, Luke Wilde <luke@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/ContentSecurityPolicy/Directives/DirectiveOperations.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/Names.h>
+#include <LibWeb/ContentSecurityPolicy/Directives/ScriptSourceDirective.h>
+#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
+
+namespace Web::ContentSecurityPolicy::Directives {
+
+GC_DEFINE_ALLOCATOR(ScriptSourceDirective);
+
+ScriptSourceDirective::ScriptSourceDirective(String name, Vector<String> value)
+    : Directive(move(name), move(value))
+{
+}
+
+// https://w3c.github.io/webappsec-csp/#script-src-pre-request
+Directive::Result ScriptSourceDirective::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, script-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::ScriptSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. Return the result of executing § 6.7.1.1 Script directives pre-request check on request, this directive,
+    //    and policy.
+    return script_directives_pre_request_check(request, *this, policy);
+}
+
+// https://w3c.github.io/webappsec-csp/#script-src-post-request
+Directive::Result ScriptSourceDirective::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, script-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::ScriptSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 3. Return the result of executing § 6.7.1.2 Script directives post-request check on request, response, this
+    //    directive, and policy.
+    return script_directives_post_request_check(request, response, *this, policy);
+}
+
+// https://w3c.github.io/webappsec-csp/#script-src-inline
+Directive::Result ScriptSourceDirective::inline_check(GC::Heap&, GC::Ptr<DOM::Element const> element, InlineType type, GC::Ref<Policy const> policy, String const& source) const
+{
+    // 1. Assert: element is not null or type is "navigation".
+    VERIFY(element || type == InlineType::Navigation);
+
+    // 2. Let name be the result of executing § 6.8.2 Get the effective directive for inline checks on type.
+    auto name = get_the_effective_directive_for_inline_checks(type);
+
+    // 3. If the result of executing § 6.8.4 Should fetch directive execute on name, script-src and policy is "No",
+    //    return "Allowed".
+    if (should_fetch_directive_execute(name, Names::ScriptSrc, policy) == ShouldExecute::No)
+        return Result::Allowed;
+
+    // 4. If the result of executing § 6.7.3.3 Does element match source list for type and source? on element, this
+    //    directive’s value, type, and source, is "Does Not Match", return "Blocked".
+    if (does_element_match_source_list_for_type_and_source(element, value(), type, source) == MatchResult::DoesNotMatch)
+        return Result::Blocked;
+
+    // 5. Return "Allowed".
+    return Result::Allowed;
+}
+
+}