b661246913
nsIPrincipal is not yet threadsafe (bug 1443925). This is a problem in the context of threadsafe nsIURI, where cloning an nsIURI would also AddRef the principal.
To get around this problem, we use nsMainThreadPtrHandle<nsIPrincipal>. This means cloning the URI would not AddRef the principal (it addrefs the nsMainThreadPtrHolder that holds the principal). When the last ref is dropped, the principal is released on the main thread.
We should get rid of this once principals become thread-safe
MozReview-Commit-ID: AbJEhTNXVv6
130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsHostObjectURI_h
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#define nsHostObjectURI_h
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/File.h"
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#include "nsCOMPtr.h"
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#include "nsIClassInfo.h"
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#include "nsIPrincipal.h"
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#include "nsISerializable.h"
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#include "nsIURIWithPrincipal.h"
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#include "nsSimpleURI.h"
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#include "nsIIPCSerializableURI.h"
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#include "nsProxyRelease.h"
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/**
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* These URIs refer to host objects: Blobs, with scheme "blob",
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* MediaStreams, with scheme "mediastream", and MediaSources, with scheme
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* "mediasource".
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*/
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class nsHostObjectURI final
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: public mozilla::net::nsSimpleURI
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, public nsIURIWithPrincipal
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{
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private:
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explicit nsHostObjectURI(nsIPrincipal* aPrincipal)
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: mozilla::net::nsSimpleURI()
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{
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mPrincipal = new nsMainThreadPtrHolder<nsIPrincipal>("nsIPrincipal", aPrincipal, false);
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}
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// For use only from deserialization
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explicit nsHostObjectURI()
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: mozilla::net::nsSimpleURI()
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{}
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIURIWITHPRINCIPAL
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NS_DECL_NSISERIALIZABLE
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NS_DECL_NSICLASSINFO
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NS_DECL_NSIIPCSERIALIZABLEURI
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// Override CloneInternal() and EqualsInternal()
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virtual nsresult CloneInternal(RefHandlingEnum aRefHandlingMode,
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const nsACString& newRef,
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nsIURI** aClone) override;
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virtual nsresult EqualsInternal(nsIURI* aOther,
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RefHandlingEnum aRefHandlingMode,
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bool* aResult) override;
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// Override StartClone to hand back a nsHostObjectURI
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virtual mozilla::net::nsSimpleURI* StartClone(RefHandlingEnum refHandlingMode,
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const nsACString& newRef) override
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{
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nsHostObjectURI* url = new nsHostObjectURI();
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SetRefOnClone(url, refHandlingMode, newRef);
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return url;
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}
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NS_IMETHOD Mutate(nsIURIMutator * *_retval) override;
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nsMainThreadPtrHandle<nsIPrincipal> mPrincipal;
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protected:
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virtual ~nsHostObjectURI() {}
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nsresult SetScheme(const nsACString &aProtocol) override;
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bool Deserialize(const mozilla::ipc::URIParams&);
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nsresult ReadPrivate(nsIObjectInputStream *stream);
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public:
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class Mutator final
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: public nsIURIMutator
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, public BaseURIMutator<nsHostObjectURI>
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, public nsIPrincipalURIMutator
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, public nsISerializable
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{
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NS_DECL_ISUPPORTS
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NS_FORWARD_SAFE_NSIURISETTERS_RET(mURI)
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NS_DEFINE_NSIMUTATOR_COMMON
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NS_IMETHOD
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Write(nsIObjectOutputStream *aOutputStream) override
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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MOZ_MUST_USE NS_IMETHOD
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Read(nsIObjectInputStream* aStream) override
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{
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return InitFromInputStream(aStream);
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}
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MOZ_MUST_USE NS_IMETHOD
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SetPrincipal(nsIPrincipal *aPrincipal) override
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{
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if (!mURI) {
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return NS_ERROR_NULL_POINTER;
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}
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MOZ_ASSERT(NS_IsMainThread());
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mURI->mPrincipal = new nsMainThreadPtrHolder<nsIPrincipal>("nsIPrincipal", aPrincipal, false);
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return NS_OK;
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}
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explicit Mutator() { }
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private:
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virtual ~Mutator() { }
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friend class nsHostObjectURI;
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};
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friend BaseURIMutator<nsHostObjectURI>;
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};
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#define NS_HOSTOBJECTURI_CID \
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{ 0xf5475c51, 0x59a7, 0x4757, \
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{ 0xb3, 0xd9, 0xe2, 0x11, 0xa9, 0x41, 0x08, 0x72 } }
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#define NS_HOSTOBJECTURIMUTATOR_CID \
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{ 0xbbe50ef2, 0x80eb, 0x469d, \
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{ 0xb7, 0x0d, 0x02, 0x85, 0x82, 0x75, 0x38, 0x9f } }
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#endif /* nsHostObjectURI_h */
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