1 files changed, 157 insertions, 0 deletions
diff --git a/dom/security/featurepolicy/FeaturePolicyParser.cpp b/dom/security/featurepolicy/FeaturePolicyParser.cpp
new file mode 100644
index 0000000000..8ab95420aa
--- /dev/null
+++ b/dom/security/featurepolicy/FeaturePolicyParser.cpp
@@ -0,0 +1,157 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FeaturePolicyParser.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/dom/Feature.h"
+#include "mozilla/dom/FeaturePolicyUtils.h"
+#include "mozilla/dom/PolicyTokenizer.h"
+#include "nsIScriptError.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+void ReportToConsoleUnsupportedFeature(Document* aDocument,
+                                       const nsString& aFeatureName) {
+  if (!aDocument) {
+    return;
+  }
+
+  AutoTArray<nsString, 1> params = {aFeatureName};
+
+  nsContentUtils::ReportToConsole(
+      nsIScriptError::warningFlag, "Feature Policy"_ns, aDocument,
+      nsContentUtils::eSECURITY_PROPERTIES,
+      "FeaturePolicyUnsupportedFeatureName", params);
+}
+
+void ReportToConsoleInvalidEmptyAllowValue(Document* aDocument,
+                                           const nsString& aFeatureName) {
+  if (!aDocument) {
+    return;
+  }
+
+  AutoTArray<nsString, 1> params = {aFeatureName};
+
+  nsContentUtils::ReportToConsole(
+      nsIScriptError::warningFlag, "Feature Policy"_ns, aDocument,
+      nsContentUtils::eSECURITY_PROPERTIES,
+      "FeaturePolicyInvalidEmptyAllowValue", params);
+}
+
+void ReportToConsoleInvalidAllowValue(Document* aDocument,
+                                      const nsString& aValue) {
+  if (!aDocument) {
+    return;
+  }
+
+  AutoTArray<nsString, 1> params = {aValue};
+
+  nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                  "Feature Policy"_ns, aDocument,
+                                  nsContentUtils::eSECURITY_PROPERTIES,
+                                  "FeaturePolicyInvalidAllowValue", params);
+}
+
+}  // namespace
+
+/* static */
+bool FeaturePolicyParser::ParseString(const nsAString& aPolicy,
+                                      Document* aDocument,
+                                      nsIPrincipal* aSelfOrigin,
+                                      nsIPrincipal* aSrcOrigin,
+                                      nsTArray<Feature>& aParsedFeatures) {
+  MOZ_ASSERT(aSelfOrigin);
+
+  nsTArray<CopyableTArray<nsString>> tokens;
+  PolicyTokenizer::tokenizePolicy(aPolicy, tokens);
+
+  nsTArray<Feature> parsedFeatures;
+
+  for (const nsTArray<nsString>& featureTokens : tokens) {
+    if (featureTokens.IsEmpty()) {
+      continue;
+    }
+
+    if (!FeaturePolicyUtils::IsSupportedFeature(featureTokens[0])) {
+      ReportToConsoleUnsupportedFeature(aDocument, featureTokens[0]);
+      continue;
+    }
+
+    Feature feature(featureTokens[0]);
+
+    if (featureTokens.Length() == 1) {
+      if (aSrcOrigin) {
+        feature.AppendToAllowList(aSrcOrigin);
+      } else {
+        ReportToConsoleInvalidEmptyAllowValue(aDocument, featureTokens[0]);
+        continue;
+      }
+    } else {
+      // we gotta start at 1 here
+      for (uint32_t i = 1; i < featureTokens.Length(); ++i) {
+        const nsString& curVal = featureTokens[i];
+        if (curVal.LowerCaseEqualsASCII("'none'")) {
+          feature.SetAllowsNone();
+          break;
+        }
+
+        if (curVal.EqualsLiteral("*")) {
+          feature.SetAllowsAll();
+          break;
+        }
+
+        if (curVal.LowerCaseEqualsASCII("'self'")) {
+          feature.AppendToAllowList(aSelfOrigin);
+          continue;
+        }
+
+        if (aSrcOrigin && curVal.LowerCaseEqualsASCII("'src'")) {
+          feature.AppendToAllowList(aSrcOrigin);
+          continue;
+        }
+
+        nsCOMPtr<nsIURI> uri;
+        nsresult rv = NS_NewURI(getter_AddRefs(uri), curVal);
+        if (NS_FAILED(rv)) {
+          ReportToConsoleInvalidAllowValue(aDocument, curVal);
+          continue;
+        }
+
+        nsCOMPtr<nsIPrincipal> origin = BasePrincipal::CreateContentPrincipal(
+            uri, BasePrincipal::Cast(aSelfOrigin)->OriginAttributesRef());
+        if (NS_WARN_IF(!origin)) {
+          ReportToConsoleInvalidAllowValue(aDocument, curVal);
+          continue;
+        }
+
+        feature.AppendToAllowList(origin);
+      }
+    }
+
+    // No duplicate!
+    bool found = false;
+    for (const Feature& parsedFeature : parsedFeatures) {
+      if (parsedFeature.Name() == feature.Name()) {
+        found = true;
+        break;
+      }
+    }
+
+    if (!found) {
+      parsedFeatures.AppendElement(feature);
+    }
+  }
+
+  aParsedFeatures = std::move(parsedFeatures);
+  return true;
+}
+
+}  // namespace mozilla::dom