gecko/layout/style/nsFontFaceLoader.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* John Daggett <jdaggett@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* code for loading in @font-face defined font data */
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif /* MOZ_LOGGING */
#include "prlog.h"
#include "nsFontFaceLoader.h"
#include "nsError.h"
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#include "nsIFile.h"
#include "nsILocalFile.h"
#include "nsIStreamListener.h"
#include "nsNetUtil.h"
#include "nsIChannelEventSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsContentUtils.h"
#include "nsIPrefService.h"
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#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIPrincipal.h"
#include "nsIScriptSecurityManager.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIContentPolicy.h"
#include "nsContentPolicyUtils.h"
#include "nsContentErrors.h"
#include "nsCrossSiteListenerProxy.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIChannelPolicy.h"
#include "nsChannelPolicy.h"
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#ifdef PR_LOGGING
static PRLogModuleInfo *gFontDownloaderLog = PR_NewLogModule("fontdownloader");
#endif /* PR_LOGGING */
#define LOG(args) PR_LOG(gFontDownloaderLog, PR_LOG_DEBUG, args)
#define LOG_ENABLED() PR_LOG_TEST(gFontDownloaderLog, PR_LOG_DEBUG)
nsFontFaceLoader::nsFontFaceLoader(gfxFontEntry *aFontToLoad, nsIURI *aFontURI,
nsUserFontSet *aFontSet, nsIChannel *aChannel)
: mFontEntry(aFontToLoad), mFontURI(aFontURI), mFontSet(aFontSet),
mChannel(aChannel)
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{
}
nsFontFaceLoader::~nsFontFaceLoader()
{
if (mLoadTimer) {
mLoadTimer->Cancel();
mLoadTimer = nsnull;
}
if (mFontSet) {
mFontSet->RemoveLoader(this);
}
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}
void
nsFontFaceLoader::StartedLoading(nsIStreamLoader *aStreamLoader)
{
PRInt32 loadTimeout = 3000;
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
prefs->GetIntPref("gfx.downloadable_fonts.fallback_delay", &loadTimeout);
}
if (loadTimeout > 0) {
mLoadTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mLoadTimer) {
mLoadTimer->InitWithFuncCallback(LoadTimerCallback,
static_cast<void*>(this),
loadTimeout,
nsITimer::TYPE_ONE_SHOT);
}
} else {
gfxProxyFontEntry *pe =
static_cast<gfxProxyFontEntry*>(mFontEntry.get());
pe->mLoadingState = gfxProxyFontEntry::LOADING_SLOWLY;
}
mStreamLoader = aStreamLoader;
}
void
nsFontFaceLoader::LoadTimerCallback(nsITimer *aTimer, void *aClosure)
{
nsFontFaceLoader *loader = static_cast<nsFontFaceLoader*>(aClosure);
if (!loader->mFontEntry->mIsProxy) {
return;
}
gfxProxyFontEntry *pe =
static_cast<gfxProxyFontEntry*>(loader->mFontEntry.get());
bool updateUserFontSet = true;
// If the entry is loading, check whether it's >75% done; if so,
// we allow another timeout period before showing a fallback font.
if (pe->mLoadingState == gfxProxyFontEntry::LOADING_STARTED) {
PRInt32 contentLength;
loader->mChannel->GetContentLength(&contentLength);
PRUint32 numBytesRead;
loader->mStreamLoader->GetNumBytesRead(&numBytesRead);
if (contentLength > 0 &&
numBytesRead > 3 * (PRUint32(contentLength) >> 2))
{
// More than 3/4 the data has been downloaded, so allow 50% extra
// time and hope the remainder will arrive before the additional
// time expires.
pe->mLoadingState = gfxProxyFontEntry::LOADING_ALMOST_DONE;
PRUint32 delay;
loader->mLoadTimer->GetDelay(&delay);
loader->mLoadTimer->InitWithFuncCallback(LoadTimerCallback,
static_cast<void*>(loader),
delay >> 1,
nsITimer::TYPE_ONE_SHOT);
updateUserFontSet = false;
LOG(("fontdownloader (%p) 75%% done, resetting timer\n", loader));
}
}
// If the font is not 75% loaded, or if we've already timed out once
// before, we mark this entry as "loading slowly", so the fallback
// font will be used in the meantime, and tell the context to refresh.
if (updateUserFontSet) {
pe->mLoadingState = gfxProxyFontEntry::LOADING_SLOWLY;
nsPresContext *ctx = loader->mFontSet->GetPresContext();
NS_ASSERTION(ctx, "fontSet doesn't have a presContext?");
gfxUserFontSet *fontSet;
if (ctx && (fontSet = ctx->GetUserFontSet()) != nsnull) {
fontSet->IncrementGeneration();
ctx->UserFontSetUpdated();
LOG(("fontdownloader (%p) timeout reflow\n", loader));
}
}
}
NS_IMPL_ISUPPORTS1(nsFontFaceLoader, nsIStreamLoaderObserver)
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NS_IMETHODIMP
nsFontFaceLoader::OnStreamComplete(nsIStreamLoader* aLoader,
nsISupports* aContext,
nsresult aStatus,
PRUint32 aStringLen,
const PRUint8* aString)
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{
if (!mFontSet) {
// We've been canceled
return aStatus;
}
mFontSet->RemoveLoader(this);
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#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsCAutoString fontURI;
mFontURI->GetSpec(fontURI);
if (NS_SUCCEEDED(aStatus)) {
LOG(("fontdownloader (%p) download completed - font uri: (%s)\n",
this, fontURI.get()));
} else {
LOG(("fontdownloader (%p) download failed - font uri: (%s) error: %8.8x\n",
this, fontURI.get(), aStatus));
}
}
#endif
nsPresContext *ctx = mFontSet->GetPresContext();
NS_ASSERTION(ctx && !ctx->PresShell()->IsDestroying(),
"We should have been canceled already");
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// whether an error occurred or not, notify the user font set of the completion
gfxUserFontSet *userFontSet = ctx->GetUserFontSet();
if (!userFontSet) {
return aStatus;
}
// The userFontSet is responsible for freeing the downloaded data
// (aString) when finished with it; the pointer is no longer valid
// after OnLoadComplete returns.
PRBool fontUpdate = userFontSet->OnLoadComplete(mFontEntry,
aString, aStringLen,
aStatus);
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// when new font loaded, need to reflow
if (fontUpdate) {
// Update layout for the presence of the new font. Since this is
// asynchronous, reflows will coalesce.
ctx->UserFontSetUpdated();
LOG(("fontdownloader (%p) reflow\n", this));
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}
return NS_SUCCESS_ADOPTED_DATA;
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}
void
nsFontFaceLoader::Cancel()
{
mFontSet = nsnull;
if (mLoadTimer) {
mLoadTimer->Cancel();
mLoadTimer = nsnull;
}
mChannel->Cancel(NS_BINDING_ABORTED);
}
nsresult
nsFontFaceLoader::CheckLoadAllowed(nsIPrincipal* aSourcePrincipal,
nsIURI* aTargetURI,
nsISupports* aContext)
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{
nsresult rv;
if (!aSourcePrincipal)
return NS_OK;
// check with the security manager
nsIScriptSecurityManager *secMan = nsContentUtils::GetSecurityManager();
rv = secMan->CheckLoadURIWithPrincipal(aSourcePrincipal, aTargetURI,
nsIScriptSecurityManager::STANDARD);
if (NS_FAILED(rv)) {
return rv;
}
// check content policy
PRInt16 shouldLoad = nsIContentPolicy::ACCEPT;
rv = NS_CheckContentLoadPolicy(nsIContentPolicy::TYPE_FONT,
aTargetURI,
aSourcePrincipal,
aContext,
EmptyCString(), // mime type
nsnull,
&shouldLoad,
nsContentUtils::GetContentPolicy(),
nsContentUtils::GetSecurityManager());
if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) {
return NS_ERROR_CONTENT_BLOCKED;
}
return NS_OK;
}
nsUserFontSet::nsUserFontSet(nsPresContext *aContext)
: mPresContext(aContext)
{
NS_ASSERTION(mPresContext, "null context passed to nsUserFontSet");
mLoaders.Init();
}
nsUserFontSet::~nsUserFontSet()
{
NS_ASSERTION(mLoaders.Count() == 0, "mLoaders should have been emptied");
}
static PLDHashOperator DestroyIterator(nsPtrHashKey<nsFontFaceLoader>* aKey,
void* aUserArg)
{
aKey->GetKey()->Cancel();
return PL_DHASH_REMOVE;
}
void
nsUserFontSet::Destroy()
{
mPresContext = nsnull;
mLoaders.EnumerateEntries(DestroyIterator, nsnull);
}
void
nsUserFontSet::RemoveLoader(nsFontFaceLoader *aLoader)
{
mLoaders.RemoveEntry(aLoader);
}
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nsresult
nsUserFontSet::StartLoad(gfxFontEntry *aFontToLoad,
const gfxFontFaceSrc *aFontFaceSrc)
{
nsresult rv;
// check same-site origin
nsIPresShell *ps = mPresContext->PresShell();
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if (!ps)
return NS_ERROR_FAILURE;
NS_ASSERTION(aFontFaceSrc && !aFontFaceSrc->mIsLocal,
"bad font face url passed to fontloader");
NS_ASSERTION(aFontFaceSrc->mURI, "null font uri");
if (!aFontFaceSrc->mURI)
return NS_ERROR_FAILURE;
// use document principal, original principal if flag set
// this enables user stylesheets to load font files via
// @font-face rules
nsCOMPtr<nsIPrincipal> principal = ps->GetDocument()->NodePrincipal();
NS_ASSERTION(aFontFaceSrc->mOriginPrincipal,
"null origin principal in @font-face rule");
if (aFontFaceSrc->mUseOriginPrincipal) {
principal = do_QueryInterface(aFontFaceSrc->mOriginPrincipal);
}
rv = nsFontFaceLoader::CheckLoadAllowed(principal, aFontFaceSrc->mURI,
ps->GetDocument());
if (NS_FAILED(rv)) {
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsCAutoString fontURI, referrerURI;
aFontFaceSrc->mURI->GetSpec(fontURI);
if (aFontFaceSrc->mReferrer)
aFontFaceSrc->mReferrer->GetSpec(referrerURI);
LOG(("fontdownloader download blocked - font uri: (%s) "
"referrer uri: (%s) err: %8.8x\n",
fontURI.get(), referrerURI.get(), rv));
}
#endif
return rv;
}
nsCOMPtr<nsIStreamLoader> streamLoader;
nsCOMPtr<nsILoadGroup> loadGroup(ps->GetDocument()->GetDocumentLoadGroup());
nsCOMPtr<nsIChannel> channel;
// get Content Security Policy from principal to pass into channel
nsCOMPtr<nsIChannelPolicy> channelPolicy;
nsCOMPtr<nsIContentSecurityPolicy> csp;
rv = principal->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, rv);
if (csp) {
channelPolicy = do_CreateInstance("@mozilla.org/nschannelpolicy;1");
channelPolicy->SetContentSecurityPolicy(csp);
channelPolicy->SetLoadType(nsIContentPolicy::TYPE_FONT);
}
rv = NS_NewChannel(getter_AddRefs(channel),
aFontFaceSrc->mURI,
nsnull,
loadGroup,
nsnull,
nsIRequest::LOAD_NORMAL,
channelPolicy);
NS_ENSURE_SUCCESS(rv, rv);
nsRefPtr<nsFontFaceLoader> fontLoader =
new nsFontFaceLoader(aFontToLoad, aFontFaceSrc->mURI, this, channel);
if (!fontLoader)
return NS_ERROR_OUT_OF_MEMORY;
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#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsCAutoString fontURI, referrerURI;
aFontFaceSrc->mURI->GetSpec(fontURI);
if (aFontFaceSrc->mReferrer)
aFontFaceSrc->mReferrer->GetSpec(referrerURI);
LOG(("fontdownloader (%p) download start - font uri: (%s) "
"referrer uri: (%s)\n",
fontLoader.get(), fontURI.get(), referrerURI.get()));
}
#endif
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
if (httpChannel)
httpChannel->SetReferrer(aFontFaceSrc->mReferrer);
rv = NS_NewStreamLoader(getter_AddRefs(streamLoader), fontLoader);
NS_ENSURE_SUCCESS(rv, rv);
PRBool inherits = PR_FALSE;
rv = NS_URIChainHasFlags(aFontFaceSrc->mURI,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
&inherits);
if (NS_SUCCEEDED(rv) && inherits) {
// allow data, javascript, etc URI's
rv = channel->AsyncOpen(streamLoader, nsnull);
} else {
nsCOMPtr<nsIStreamListener> listener =
new nsCrossSiteListenerProxy(streamLoader, principal, channel,
PR_FALSE, &rv);
if (NS_FAILED(rv)) {
fontLoader->DropChannel(); // explicitly need to break ref cycle
}
NS_ENSURE_TRUE(listener, NS_ERROR_OUT_OF_MEMORY);
NS_ENSURE_SUCCESS(rv, rv);
rv = channel->AsyncOpen(listener, nsnull);
}
if (NS_SUCCEEDED(rv)) {
mLoaders.PutEntry(fontLoader);
fontLoader->StartedLoading(streamLoader);
}
return rv;
}