Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

1 files changed, 246 insertions, 0 deletions

diff --git a/docshell/base/BaseHistory.cpp b/docshell/base/BaseHistory.cpp
new file mode 100644
index 0000000000..a38fb71657
--- /dev/null
+++ b/docshell/base/BaseHistory.cpp
@@ -0,0 +1,246 @@
+/* -*- 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 "BaseHistory.h"
+#include "nsThreadUtils.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Link.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/StaticPrefs_layout.h"
+
+namespace mozilla {
+
+using mozilla::dom::ContentParent;
+using mozilla::dom::Link;
+
+BaseHistory::BaseHistory() : mTrackedURIs(kTrackedUrisInitialSize) {}
+
+BaseHistory::~BaseHistory() = default;
+
+static constexpr nsLiteralCString kDisallowedSchemes[] = {
+    "about"_ns,         "blob"_ns,       "data"_ns,     "chrome"_ns,
+    "imap"_ns,          "javascript"_ns, "mailbox"_ns,  "moz-anno"_ns,
+    "news"_ns,          "page-icon"_ns,  "resource"_ns, "view-source"_ns,
+    "moz-extension"_ns,
+};
+
+bool BaseHistory::CanStore(nsIURI* aURI) {
+  nsAutoCString scheme;
+  if (NS_WARN_IF(NS_FAILED(aURI->GetScheme(scheme)))) {
+    return false;
+  }
+
+  if (!scheme.EqualsLiteral("http") && !scheme.EqualsLiteral("https")) {
+    for (const nsLiteralCString& disallowed : kDisallowedSchemes) {
+      if (scheme.Equals(disallowed)) {
+        return false;
+      }
+    }
+  }
+
+  nsAutoCString spec;
+  aURI->GetSpec(spec);
+  return spec.Length() <= StaticPrefs::browser_history_maxUrlLength();
+}
+
+void BaseHistory::ScheduleVisitedQuery(nsIURI* aURI,
+                                       dom::ContentParent* aForProcess) {
+  mPendingQueries.WithEntryHandle(aURI, [&](auto&& entry) {
+    auto& set = entry.OrInsertWith([] { return ContentParentSet(); });
+    if (aForProcess) {
+      set.Insert(aForProcess);
+    }
+  });
+  if (mStartPendingVisitedQueriesScheduled) {
+    return;
+  }
+  mStartPendingVisitedQueriesScheduled =
+      NS_SUCCEEDED(NS_DispatchToMainThreadQueue(
+          NS_NewRunnableFunction(
+              "BaseHistory::StartPendingVisitedQueries",
+              [self = RefPtr<BaseHistory>(this)] {
+                self->mStartPendingVisitedQueriesScheduled = false;
+                auto queries = std::move(self->mPendingQueries);
+                self->StartPendingVisitedQueries(std::move(queries));
+                MOZ_DIAGNOSTIC_ASSERT(self->mPendingQueries.IsEmpty());
+              }),
+          EventQueuePriority::Idle));
+}
+
+void BaseHistory::CancelVisitedQueryIfPossible(nsIURI* aURI) {
+  mPendingQueries.Remove(aURI);
+  // TODO(bug 1591393): It could be worth to make this virtual and allow places
+  // to stop the existing database query? Needs some measurement.
+}
+
+void BaseHistory::RegisterVisitedCallback(nsIURI* aURI, Link* aLink) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aURI, "Must pass a non-null URI!");
+  MOZ_ASSERT(aLink, "Must pass a non-null Link!");
+
+  if (!CanStore(aURI)) {
+    aLink->VisitedQueryFinished(/* visited = */ false);
+    return;
+  }
+
+  // Obtain our array of observers for this URI.
+  auto* const links =
+      mTrackedURIs.WithEntryHandle(aURI, [&](auto&& entry) -> ObservingLinks* {
+        MOZ_DIAGNOSTIC_ASSERT(!entry || !entry->mLinks.IsEmpty(),
+                              "An empty key was kept around in our hashtable!");
+        if (!entry) {
+          ScheduleVisitedQuery(aURI, nullptr);
+        }
+
+        return &entry.OrInsertWith([] { return ObservingLinks{}; });
+      });
+
+  if (!links) {
+    return;
+  }
+
+  // Sanity check that Links are not registered more than once for a given URI.
+  // This will not catch a case where it is registered for two different URIs.
+  MOZ_DIAGNOSTIC_ASSERT(!links->mLinks.Contains(aLink),
+                        "Already tracking this Link object!");
+
+  links->mLinks.AppendElement(aLink);
+
+  // If this link has already been queried and we should notify, do so now.
+  switch (links->mStatus) {
+    case VisitedStatus::Unknown:
+      break;
+    case VisitedStatus::Unvisited:
+      [[fallthrough]];
+    case VisitedStatus::Visited:
+      aLink->VisitedQueryFinished(links->mStatus == VisitedStatus::Visited);
+      break;
+  }
+}
+
+void BaseHistory::UnregisterVisitedCallback(nsIURI* aURI, Link* aLink) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aURI, "Must pass a non-null URI!");
+  MOZ_ASSERT(aLink, "Must pass a non-null Link object!");
+
+  // Get the array, and remove the item from it.
+  auto entry = mTrackedURIs.Lookup(aURI);
+  if (!entry) {
+    MOZ_ASSERT(!CanStore(aURI),
+               "Trying to unregister URI that wasn't registered, "
+               "and that could be visited!");
+    return;
+  }
+
+  ObserverArray& observers = entry->mLinks;
+  if (!observers.RemoveElement(aLink)) {
+    MOZ_ASSERT_UNREACHABLE("Trying to unregister node that wasn't registered!");
+    return;
+  }
+
+  // If the array is now empty, we should remove it from the hashtable.
+  if (observers.IsEmpty()) {
+    entry.Remove();
+    CancelVisitedQueryIfPossible(aURI);
+  }
+}
+
+void BaseHistory::NotifyVisited(
+    nsIURI* aURI, VisitedStatus aStatus,
+    const ContentParentSet* aListOfProcessesToNotify) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aStatus != VisitedStatus::Unknown);
+
+  NotifyVisitedInThisProcess(aURI, aStatus);
+  if (XRE_IsParentProcess()) {
+    NotifyVisitedFromParent(aURI, aStatus, aListOfProcessesToNotify);
+  }
+}
+
+void BaseHistory::NotifyVisitedInThisProcess(nsIURI* aURI,
+                                             VisitedStatus aStatus) {
+  if (NS_WARN_IF(!aURI)) {
+    return;
+  }
+
+  auto entry = mTrackedURIs.Lookup(aURI);
+  if (!entry) {
+    // If we have no observers for this URI, we have nothing to notify about.
+    return;
+  }
+
+  ObservingLinks& links = entry.Data();
+  links.mStatus = aStatus;
+
+  // If we have a key, it should have at least one observer.
+  MOZ_ASSERT(!links.mLinks.IsEmpty());
+
+  // Dispatch an event to each document which has a Link observing this URL.
+  // These will fire asynchronously in the correct DocGroup.
+
+  const bool visited = aStatus == VisitedStatus::Visited;
+  for (Link* link : links.mLinks.BackwardRange()) {
+    link->VisitedQueryFinished(visited);
+  }
+}
+
+void BaseHistory::SendPendingVisitedResultsToChildProcesses() {
+  MOZ_ASSERT(!mPendingResults.IsEmpty());
+
+  mStartPendingResultsScheduled = false;
+
+  auto results = std::move(mPendingResults);
+  MOZ_ASSERT(mPendingResults.IsEmpty());
+
+  nsTArray<ContentParent*> cplist;
+  nsTArray<dom::VisitedQueryResult> resultsForProcess;
+  ContentParent::GetAll(cplist);
+  for (ContentParent* cp : cplist) {
+    resultsForProcess.ClearAndRetainStorage();
+    for (auto& result : results) {
+      if (result.mProcessesToNotify.IsEmpty() ||
+          result.mProcessesToNotify.Contains(cp)) {
+        resultsForProcess.AppendElement(result.mResult);
+      }
+    }
+    if (!resultsForProcess.IsEmpty()) {
+      Unused << NS_WARN_IF(!cp->SendNotifyVisited(resultsForProcess));
+    }
+  }
+}
+
+void BaseHistory::NotifyVisitedFromParent(
+    nsIURI* aURI, VisitedStatus aStatus,
+    const ContentParentSet* aListOfProcessesToNotify) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  if (aListOfProcessesToNotify && aListOfProcessesToNotify->IsEmpty()) {
+    return;
+  }
+
+  auto& result = *mPendingResults.AppendElement();
+  result.mResult.visited() = aStatus == VisitedStatus::Visited;
+  result.mResult.uri() = aURI;
+  if (aListOfProcessesToNotify) {
+    for (auto* entry : *aListOfProcessesToNotify) {
+      result.mProcessesToNotify.Insert(entry);
+    }
+  }
+
+  if (mStartPendingResultsScheduled) {
+    return;
+  }
+
+  mStartPendingResultsScheduled = NS_SUCCEEDED(NS_DispatchToMainThreadQueue(
+      NewRunnableMethod(
+          "BaseHistory::SendPendingVisitedResultsToChildProcesses", this,
+          &BaseHistory::SendPendingVisitedResultsToChildProcesses),
+      EventQueuePriority::Idle));
+}
+
+}  // namespace mozilla