Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 247 insertions, 0 deletions

diff --git a/dom/xul/XULPersist.cpp b/dom/xul/XULPersist.cpp
new file mode 100644
index 0000000000..5048bd3ddd
--- /dev/null
+++ b/dom/xul/XULPersist.cpp
@@ -0,0 +1,247 @@
+/* -*- 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 https://mozilla.org/MPL/2.0/. */
+
+#include "XULPersist.h"
+
+#include "nsIXULStore.h"
+#include "nsIStringEnumerator.h"
+#include "nsServiceManagerUtils.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "nsContentUtils.h"
+#include "nsIAppWindow.h"
+
+namespace mozilla::dom {
+
+static bool IsRootElement(Element* aElement) {
+  return aElement->OwnerDoc()->GetRootElement() == aElement;
+}
+
+// FIXME: This is a hack to differentiate "attribute is missing" from "attribute
+// is present but empty". Use a newline to avoid virtually all collisions.
+// Ideally the XUL store would be able to store this more reasonably.
+constexpr auto kMissingAttributeToken = u"-moz-missing\n"_ns;
+
+static bool ShouldPersistAttribute(Element* aElement, nsAtom* aAttribute) {
+  if (IsRootElement(aElement)) {
+    // This is not an element of the top document, its owner is
+    // not an AppWindow. Persist it.
+    if (aElement->OwnerDoc()->GetInProcessParentDocument()) {
+      return true;
+    }
+    // The following attributes of xul:window should be handled in
+    // AppWindow::SavePersistentAttributes instead of here.
+    if (aAttribute == nsGkAtoms::screenX || aAttribute == nsGkAtoms::screenY ||
+        aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
+        aAttribute == nsGkAtoms::sizemode) {
+      return false;
+    }
+  }
+  return true;
+}
+
+NS_IMPL_ISUPPORTS(XULPersist, nsIDocumentObserver)
+
+XULPersist::XULPersist(Document* aDocument)
+    : nsStubDocumentObserver(), mDocument(aDocument) {}
+
+XULPersist::~XULPersist() = default;
+
+void XULPersist::Init() {
+  ApplyPersistentAttributes();
+  mDocument->AddObserver(this);
+}
+
+void XULPersist::DropDocumentReference() {
+  mDocument->RemoveObserver(this);
+  mDocument = nullptr;
+}
+
+void XULPersist::AttributeChanged(dom::Element* aElement, int32_t aNameSpaceID,
+                                  nsAtom* aAttribute, int32_t aModType,
+                                  const nsAttrValue* aOldValue) {
+  NS_ASSERTION(aElement->OwnerDoc() == mDocument, "unexpected doc");
+
+  if (aNameSpaceID != kNameSpaceID_None) {
+    return;
+  }
+
+  // See if there is anything we need to persist in the localstore.
+  nsAutoString persist;
+  // Persistence of attributes of xul:window is handled in AppWindow.
+  if (aElement->GetAttr(nsGkAtoms::persist, persist) &&
+      ShouldPersistAttribute(aElement, aAttribute) &&
+      // XXXldb This should check that it's a token, not just a substring.
+      persist.Find(nsDependentAtomString(aAttribute)) >= 0) {
+    // Might not need this, but be safe for now.
+    nsCOMPtr<nsIDocumentObserver> kungFuDeathGrip(this);
+    nsContentUtils::AddScriptRunner(NewRunnableMethod<Element*, nsAtom*>(
+        "dom::XULPersist::Persist", this, &XULPersist::Persist, aElement,
+        aAttribute));
+  }
+}
+
+void XULPersist::Persist(Element* aElement, nsAtom* aAttribute) {
+  if (!mDocument) {
+    return;
+  }
+  // For non-chrome documents, persistance is simply broken
+  if (!mDocument->NodePrincipal()->IsSystemPrincipal()) {
+    return;
+  }
+
+  if (!mLocalStore) {
+    mLocalStore = do_GetService("@mozilla.org/xul/xulstore;1");
+    if (NS_WARN_IF(!mLocalStore)) {
+      return;
+    }
+  }
+
+  nsAutoString id;
+
+  aElement->GetAttr(nsGkAtoms::id, id);
+  nsAtomString attrstr(aAttribute);
+
+  nsAutoCString utf8uri;
+  nsresult rv = mDocument->GetDocumentURI()->GetSpec(utf8uri);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  // Persisting attributes to top level windows is handled by AppWindow.
+  if (IsRootElement(aElement)) {
+    if (nsCOMPtr<nsIAppWindow> win =
+            mDocument->GetAppWindowIfToplevelChrome()) {
+      return;
+    }
+  }
+
+  NS_ConvertUTF8toUTF16 uri(utf8uri);
+  nsAutoString valuestr;
+  if (!aElement->GetAttr(aAttribute, valuestr)) {
+    valuestr = kMissingAttributeToken;
+  }
+
+  mLocalStore->SetValue(uri, id, attrstr, valuestr);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "value set");
+}
+
+nsresult XULPersist::ApplyPersistentAttributes() {
+  if (!mDocument) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  // For non-chrome documents, persistance is simply broken
+  if (!mDocument->NodePrincipal()->IsSystemPrincipal()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // Add all of the 'persisted' attributes into the content
+  // model.
+  if (!mLocalStore) {
+    mLocalStore = do_GetService("@mozilla.org/xul/xulstore;1");
+    if (NS_WARN_IF(!mLocalStore)) {
+      return NS_ERROR_NOT_INITIALIZED;
+    }
+  }
+
+  nsCOMArray<Element> elements;
+
+  nsAutoCString utf8uri;
+  nsresult rv = mDocument->GetDocumentURI()->GetSpec(utf8uri);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  NS_ConvertUTF8toUTF16 uri(utf8uri);
+
+  // Get a list of element IDs for which persisted values are available
+  nsCOMPtr<nsIStringEnumerator> ids;
+  rv = mLocalStore->GetIDsEnumerator(uri, getter_AddRefs(ids));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  bool hasmore;
+  while (NS_SUCCEEDED(ids->HasMore(&hasmore)) && hasmore) {
+    nsAutoString id;
+    ids->GetNext(id);
+
+    // We want to hold strong refs to the elements while applying
+    // persistent attributes, just in case.
+    const nsTArray<Element*>* allElements = mDocument->GetAllElementsForId(id);
+    if (!allElements) {
+      continue;
+    }
+    elements.Clear();
+    elements.SetCapacity(allElements->Length());
+    for (Element* element : *allElements) {
+      elements.AppendObject(element);
+    }
+
+    rv = ApplyPersistentAttributesToElements(id, uri, elements);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult XULPersist::ApplyPersistentAttributesToElements(
+    const nsAString& aID, const nsAString& aDocURI,
+    nsCOMArray<Element>& aElements) {
+  nsresult rv = NS_OK;
+  // Get a list of attributes for which persisted values are available
+  nsCOMPtr<nsIStringEnumerator> attrs;
+  rv = mLocalStore->GetAttributeEnumerator(aDocURI, aID, getter_AddRefs(attrs));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  bool hasmore;
+  while (NS_SUCCEEDED(attrs->HasMore(&hasmore)) && hasmore) {
+    nsAutoString attrstr;
+    attrs->GetNext(attrstr);
+
+    nsAutoString value;
+    rv = mLocalStore->GetValue(aDocURI, aID, attrstr, value);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    RefPtr<nsAtom> attr = NS_Atomize(attrstr);
+    if (NS_WARN_IF(!attr)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    uint32_t cnt = aElements.Length();
+    for (int32_t i = int32_t(cnt) - 1; i >= 0; --i) {
+      Element* element = aElements.SafeElementAt(i);
+      if (!element) {
+        continue;
+      }
+
+      // Applying persistent attributes to top level windows is handled
+      // by AppWindow.
+      if (IsRootElement(element)) {
+        if (nsCOMPtr<nsIAppWindow> win =
+                mDocument->GetAppWindowIfToplevelChrome()) {
+          continue;
+        }
+      }
+
+      if (value == kMissingAttributeToken) {
+        Unused << element->UnsetAttr(kNameSpaceID_None, attr, true);
+      } else {
+        Unused << element->SetAttr(kNameSpaceID_None, attr, value, true);
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom