gecko-dev/dom/base/Link.cpp
Dragana Damjanovic dd.mozilla@gmail.com 638edf0077 Bug 1279440 - Fix prefetch for rel=next. r=smaug
2016-06-23 08:52:00 +02:00

661 lines
16 KiB
C++

/* -*- 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 "Link.h"
#include "mozilla/EventStates.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Element.h"
#include "nsIURL.h"
#include "nsISizeOf.h"
#include "nsIDocShell.h"
#include "nsIPrefetchService.h"
#include "nsCPrefetchService.h"
#include "nsStyleLinkElement.h"
#include "nsEscape.h"
#include "nsGkAtoms.h"
#include "nsHTMLDNSPrefetch.h"
#include "nsString.h"
#include "mozAutoDocUpdate.h"
#include "mozilla/Services.h"
namespace mozilla {
namespace dom {
Link::Link(Element *aElement)
: mElement(aElement)
, mHistory(services::GetHistoryService())
, mLinkState(eLinkState_NotLink)
, mNeedsRegistration(false)
, mRegistered(false)
{
MOZ_ASSERT(mElement, "Must have an element");
}
Link::~Link()
{
UnregisterFromHistory();
}
bool
Link::ElementHasHref() const
{
return ((!mElement->IsSVGElement() &&
mElement->HasAttr(kNameSpaceID_None, nsGkAtoms::href))
|| (!mElement->IsHTMLElement() &&
mElement->HasAttr(kNameSpaceID_XLink, nsGkAtoms::href)));
}
void
Link::TryDNSPrefetch()
{
MOZ_ASSERT(mElement->IsInComposedDoc());
if (ElementHasHref() && nsHTMLDNSPrefetch::IsAllowed(mElement->OwnerDoc())) {
nsHTMLDNSPrefetch::PrefetchLow(this);
}
}
void
Link::CancelDNSPrefetch(nsWrapperCache::FlagsType aDeferredFlag,
nsWrapperCache::FlagsType aRequestedFlag)
{
// If prefetch was deferred, clear flag and move on
if (mElement->HasFlag(aDeferredFlag)) {
mElement->UnsetFlags(aDeferredFlag);
// Else if prefetch was requested, clear flag and send cancellation
} else if (mElement->HasFlag(aRequestedFlag)) {
mElement->UnsetFlags(aRequestedFlag);
// Possible that hostname could have changed since binding, but since this
// covers common cases, most DNS prefetch requests will be canceled
nsHTMLDNSPrefetch::CancelPrefetchLow(this, NS_ERROR_ABORT);
}
}
void
Link::TryDNSPrefetchPreconnectOrPrefetch()
{
MOZ_ASSERT(mElement->IsInComposedDoc());
if (!ElementHasHref()) {
return;
}
nsAutoString rel;
if (!mElement->GetAttr(kNameSpaceID_None, nsGkAtoms::rel, rel)) {
return;
}
if (!nsContentUtils::PrefetchEnabled(mElement->OwnerDoc()->GetDocShell())) {
return;
}
uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(rel,
mElement->NodePrincipal());
if ((linkTypes & nsStyleLinkElement::ePREFETCH) ||
(linkTypes & nsStyleLinkElement::eNEXT)){
nsCOMPtr<nsIPrefetchService> prefetchService(do_GetService(NS_PREFETCHSERVICE_CONTRACTID));
if (prefetchService) {
nsCOMPtr<nsIURI> uri(GetURI());
if (uri) {
nsCOMPtr<nsIDOMNode> domNode = GetAsDOMNode(mElement);
prefetchService->PrefetchURI(uri,
mElement->OwnerDoc()->GetDocumentURI(),
domNode, linkTypes & nsStyleLinkElement::ePREFETCH);
return;
}
}
}
if (linkTypes & nsStyleLinkElement::ePRECONNECT) {
nsCOMPtr<nsIURI> uri(GetURI());
if (uri && mElement->OwnerDoc()) {
mElement->OwnerDoc()->MaybePreconnect(uri,
mElement->AttrValueToCORSMode(mElement->GetParsedAttr(nsGkAtoms::crossorigin)));
return;
}
}
if (linkTypes & nsStyleLinkElement::eDNS_PREFETCH) {
if (nsHTMLDNSPrefetch::IsAllowed(mElement->OwnerDoc())) {
nsHTMLDNSPrefetch::PrefetchLow(this);
}
}
}
void
Link::CancelPrefetch()
{
nsCOMPtr<nsIPrefetchService> prefetchService(do_GetService(NS_PREFETCHSERVICE_CONTRACTID));
if (prefetchService) {
nsCOMPtr<nsIURI> uri(GetURI());
if (uri) {
nsCOMPtr<nsIDOMNode> domNode = GetAsDOMNode(mElement);
prefetchService->CancelPrefetchURI(uri, domNode);
}
}
}
void
Link::SetLinkState(nsLinkState aState)
{
NS_ASSERTION(mRegistered,
"Setting the link state of an unregistered Link!");
NS_ASSERTION(mLinkState != aState,
"Setting state to the currently set state!");
// Set our current state as appropriate.
mLinkState = aState;
// Per IHistory interface documentation, we are no longer registered.
mRegistered = false;
MOZ_ASSERT(LinkState() == NS_EVENT_STATE_VISITED ||
LinkState() == NS_EVENT_STATE_UNVISITED,
"Unexpected state obtained from LinkState()!");
// Tell the element to update its visited state
mElement->UpdateState(true);
}
EventStates
Link::LinkState() const
{
// We are a constant method, but we are just lazily doing things and have to
// track that state. Cast away that constness!
Link *self = const_cast<Link *>(this);
Element *element = self->mElement;
// If we have not yet registered for notifications and need to,
// due to our href changing, register now!
if (!mRegistered && mNeedsRegistration && element->IsInComposedDoc()) {
// Only try and register once.
self->mNeedsRegistration = false;
nsCOMPtr<nsIURI> hrefURI(GetURI());
// Assume that we are not visited until we are told otherwise.
self->mLinkState = eLinkState_Unvisited;
// Make sure the href attribute has a valid link (bug 23209).
// If we have a good href, register with History if available.
if (mHistory && hrefURI) {
nsresult rv = mHistory->RegisterVisitedCallback(hrefURI, self);
if (NS_SUCCEEDED(rv)) {
self->mRegistered = true;
// And make sure we are in the document's link map.
element->GetComposedDoc()->AddStyleRelevantLink(self);
}
}
}
// Otherwise, return our known state.
if (mLinkState == eLinkState_Visited) {
return NS_EVENT_STATE_VISITED;
}
if (mLinkState == eLinkState_Unvisited) {
return NS_EVENT_STATE_UNVISITED;
}
return EventStates();
}
nsIURI*
Link::GetURI() const
{
// If we have this URI cached, use it.
if (mCachedURI) {
return mCachedURI;
}
// Otherwise obtain it.
Link *self = const_cast<Link *>(this);
Element *element = self->mElement;
mCachedURI = element->GetHrefURI();
return mCachedURI;
}
void
Link::SetProtocol(const nsAString &aProtocol)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
nsAString::const_iterator start, end;
aProtocol.BeginReading(start);
aProtocol.EndReading(end);
nsAString::const_iterator iter(start);
(void)FindCharInReadable(':', iter, end);
(void)uri->SetScheme(NS_ConvertUTF16toUTF8(Substring(start, iter)));
SetHrefAttribute(uri);
}
void
Link::SetPassword(const nsAString &aPassword)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
uri->SetPassword(NS_ConvertUTF16toUTF8(aPassword));
SetHrefAttribute(uri);
}
void
Link::SetUsername(const nsAString &aUsername)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
uri->SetUsername(NS_ConvertUTF16toUTF8(aUsername));
SetHrefAttribute(uri);
}
void
Link::SetHost(const nsAString &aHost)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
(void)uri->SetHostPort(NS_ConvertUTF16toUTF8(aHost));
SetHrefAttribute(uri);
}
void
Link::SetHostname(const nsAString &aHostname)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
(void)uri->SetHost(NS_ConvertUTF16toUTF8(aHostname));
SetHrefAttribute(uri);
}
void
Link::SetPathname(const nsAString &aPathname)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
if (!url) {
// Ignore failures to be compatible with NS4.
return;
}
(void)url->SetFilePath(NS_ConvertUTF16toUTF8(aPathname));
SetHrefAttribute(uri);
}
void
Link::SetSearch(const nsAString& aSearch)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
if (!url) {
// Ignore failures to be compatible with NS4.
return;
}
(void)url->SetQuery(NS_ConvertUTF16toUTF8(aSearch));
SetHrefAttribute(uri);
}
void
Link::SetPort(const nsAString &aPort)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
nsresult rv;
nsAutoString portStr(aPort);
// nsIURI uses -1 as default value.
int32_t port = -1;
if (!aPort.IsEmpty()) {
port = portStr.ToInteger(&rv);
if (NS_FAILED(rv)) {
return;
}
}
(void)uri->SetPort(port);
SetHrefAttribute(uri);
}
void
Link::SetHash(const nsAString &aHash)
{
nsCOMPtr<nsIURI> uri(GetURIToMutate());
if (!uri) {
// Ignore failures to be compatible with NS4.
return;
}
(void)uri->SetRef(NS_ConvertUTF16toUTF8(aHash));
SetHrefAttribute(uri);
}
void
Link::GetOrigin(nsAString &aOrigin)
{
aOrigin.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
return;
}
nsString origin;
nsContentUtils::GetUTFOrigin(uri, origin);
aOrigin.Assign(origin);
}
void
Link::GetProtocol(nsAString &_protocol)
{
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
_protocol.AssignLiteral("http");
}
else {
nsAutoCString scheme;
(void)uri->GetScheme(scheme);
CopyASCIItoUTF16(scheme, _protocol);
}
_protocol.Append(char16_t(':'));
}
void
Link::GetUsername(nsAString& aUsername)
{
aUsername.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
return;
}
nsAutoCString username;
uri->GetUsername(username);
CopyASCIItoUTF16(username, aUsername);
}
void
Link::GetPassword(nsAString &aPassword)
{
aPassword.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
return;
}
nsAutoCString password;
uri->GetPassword(password);
CopyASCIItoUTF16(password, aPassword);
}
void
Link::GetHost(nsAString &_host)
{
_host.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
// Do not throw! Not having a valid URI should result in an empty string.
return;
}
nsAutoCString hostport;
nsresult rv = uri->GetHostPort(hostport);
if (NS_SUCCEEDED(rv)) {
CopyUTF8toUTF16(hostport, _host);
}
}
void
Link::GetHostname(nsAString &_hostname)
{
_hostname.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
// Do not throw! Not having a valid URI should result in an empty string.
return;
}
nsContentUtils::GetHostOrIPv6WithBrackets(uri, _hostname);
}
void
Link::GetPathname(nsAString &_pathname)
{
_pathname.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
if (!url) {
// Do not throw! Not having a valid URI or URL should result in an empty
// string.
return;
}
nsAutoCString file;
nsresult rv = url->GetFilePath(file);
if (NS_SUCCEEDED(rv)) {
CopyUTF8toUTF16(file, _pathname);
}
}
void
Link::GetSearch(nsAString &_search)
{
_search.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
if (!url) {
// Do not throw! Not having a valid URI or URL should result in an empty
// string.
return;
}
nsAutoCString search;
nsresult rv = url->GetQuery(search);
if (NS_SUCCEEDED(rv) && !search.IsEmpty()) {
CopyUTF8toUTF16(NS_LITERAL_CSTRING("?") + search, _search);
}
}
void
Link::GetPort(nsAString &_port)
{
_port.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
// Do not throw! Not having a valid URI should result in an empty string.
return;
}
int32_t port;
nsresult rv = uri->GetPort(&port);
// Note that failure to get the port from the URI is not necessarily a bad
// thing. Some URIs do not have a port.
if (NS_SUCCEEDED(rv) && port != -1) {
nsAutoString portStr;
portStr.AppendInt(port, 10);
_port.Assign(portStr);
}
}
void
Link::GetHash(nsAString &_hash)
{
_hash.Truncate();
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
// Do not throw! Not having a valid URI should result in an empty
// string.
return;
}
nsAutoCString ref;
nsresult rv = uri->GetRef(ref);
if (NS_SUCCEEDED(rv) && !ref.IsEmpty()) {
_hash.Assign(char16_t('#'));
if (nsContentUtils::GettersDecodeURLHash()) {
NS_UnescapeURL(ref); // XXX may result in random non-ASCII bytes!
}
AppendUTF8toUTF16(ref, _hash);
}
}
void
Link::ResetLinkState(bool aNotify, bool aHasHref)
{
nsLinkState defaultState;
// The default state for links with an href is unvisited.
if (aHasHref) {
defaultState = eLinkState_Unvisited;
} else {
defaultState = eLinkState_NotLink;
}
// If !mNeedsRegstration, then either we've never registered, or we're
// currently registered; in either case, we should remove ourself
// from the doc and the history.
if (!mNeedsRegistration && mLinkState != eLinkState_NotLink) {
nsIDocument *doc = mElement->GetComposedDoc();
if (doc && (mRegistered || mLinkState == eLinkState_Visited)) {
// Tell the document to forget about this link if we've registered
// with it before.
doc->ForgetLink(this);
}
UnregisterFromHistory();
}
// If we have an href, we should register with the history.
mNeedsRegistration = aHasHref;
// If we've cached the URI, reset always invalidates it.
mCachedURI = nullptr;
// Update our state back to the default.
mLinkState = defaultState;
// We have to be very careful here: if aNotify is false we do NOT
// want to call UpdateState, because that will call into LinkState()
// and try to start off loads, etc. But ResetLinkState is called
// with aNotify false when things are in inconsistent states, so
// we'll get confused in that situation. Instead, just silently
// update the link state on mElement. Since we might have set the
// link state to unvisited, make sure to update with that state if
// required.
if (aNotify) {
mElement->UpdateState(aNotify);
} else {
if (mLinkState == eLinkState_Unvisited) {
mElement->UpdateLinkState(NS_EVENT_STATE_UNVISITED);
} else {
mElement->UpdateLinkState(EventStates());
}
}
}
void
Link::UnregisterFromHistory()
{
// If we are not registered, we have nothing to do.
if (!mRegistered) {
return;
}
NS_ASSERTION(mCachedURI, "mRegistered is true, but we have no cached URI?!");
// And tell History to stop tracking us.
if (mHistory) {
nsresult rv = mHistory->UnregisterVisitedCallback(mCachedURI, this);
NS_ASSERTION(NS_SUCCEEDED(rv), "This should only fail if we misuse the API!");
if (NS_SUCCEEDED(rv)) {
mRegistered = false;
}
}
}
already_AddRefed<nsIURI>
Link::GetURIToMutate()
{
nsCOMPtr<nsIURI> uri(GetURI());
if (!uri) {
return nullptr;
}
nsCOMPtr<nsIURI> clone;
(void)uri->Clone(getter_AddRefs(clone));
return clone.forget();
}
void
Link::SetHrefAttribute(nsIURI *aURI)
{
NS_ASSERTION(aURI, "Null URI is illegal!");
// if we change this code to not reserialize we need to do something smarter
// in SetProtocol because changing the protocol of an URI can change the
// "nature" of the nsIURL/nsIURI implementation.
nsAutoCString href;
(void)aURI->GetSpec(href);
(void)mElement->SetAttr(kNameSpaceID_None, nsGkAtoms::href,
NS_ConvertUTF8toUTF16(href), true);
}
size_t
Link::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
if (mCachedURI) {
nsCOMPtr<nsISizeOf> iface = do_QueryInterface(mCachedURI);
if (iface) {
n += iface->SizeOfIncludingThis(aMallocSizeOf);
}
}
// The following members don't need to be measured:
// - mElement, because it is a pointer-to-self used to avoid QIs
// - mHistory, because it is non-owning
return n;
}
} // namespace dom
} // namespace mozilla