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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
#ifndef PageThumbProtocolHandler_h___
#define PageThumbProtocolHandler_h___
#include "mozilla/Result.h"
#include "mozilla/MozPromise.h"
#include "mozilla/net/RemoteStreamGetter.h"
#include "SubstitutingProtocolHandler.h"
#include "nsIInputStream.h"
#include "nsWeakReference.h"
namespace mozilla {
namespace net {
class RemoteStreamGetter;
class PageThumbProtocolHandler final : public nsISubstitutingProtocolHandler,
public SubstitutingProtocolHandler,
public nsSupportsWeakReference {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_FORWARD_NSIPROTOCOLHANDLER(SubstitutingProtocolHandler::)
NS_FORWARD_NSISUBSTITUTINGPROTOCOLHANDLER(SubstitutingProtocolHandler::)
static already_AddRefed<PageThumbProtocolHandler> GetSingleton();
/**
* To be called in the parent process to obtain an input stream for the
* given thumbnail.
*
* @param aChildURI a moz-page-thumb URI sent from the child.
* @param aTerminateSender out param set to true when the params are invalid
* and indicate the child should be terminated. If |aChildURI| is
* not a moz-page-thumb URI, the child is in an invalid state and
* should be terminated. This outparam will be set synchronously.
*
* @return RemoteStreamPromise
* The RemoteStreamPromise will resolve with an RemoteStreamInfo on
* success, and reject with an nsresult on failure.
*/
RefPtr<RemoteStreamPromise> NewStream(nsIURI* aChildURI,
bool* aTerminateSender);
protected:
~PageThumbProtocolHandler() = default;
private:
explicit PageThumbProtocolHandler();
[[nodiscard]] bool ResolveSpecialCases(const nsACString& aHost,
const nsACString& aPath,
const nsACString& aPathname,
nsACString& aResult) override;
/**
* On entry to this function, *aRetVal is expected to be non-null and already
* addrefed. This function may release the object stored in *aRetVal on entry
* and write a new pointer to an already addrefed channel to *aRetVal.
*
* @param aURI the moz-page-thumb URI.
* @param aLoadInfo the loadinfo for the request.
* @param aRetVal in/out channel param referring to the channel that
* might need to be substituted with a remote channel.
* @return NS_OK if channel has been substituted successfully or no
* substitution at all. Otherwise, returns an error. This function
* will return NS_ERROR_NO_INTERFACE if the URI resolves to a
* non file:// URI.
*/
[[nodiscard]] virtual nsresult SubstituteChannel(
nsIURI* aURI, nsILoadInfo* aLoadInfo, nsIChannel** aRetVal) override;
/**
* This replaces the provided channel with a channel that will proxy the load
* to the parent process.
*
* @param aURI the moz-page-thumb URI.
* @param aLoadInfo the loadinfo for the request.
* @param aRetVal in/out channel param referring to the channel that
* might need to be substituted with a remote channel.
* @return NS_OK if the replacement channel was created successfully.
* Otherwise, returns an error.
*/
Result<Ok, nsresult> SubstituteRemoteChannel(nsIURI* aURI,
nsILoadInfo* aLoadInfo,
nsIChannel** aRetVal);
/*
* Extracts the URL from the query string in the given moz-page-thumb URI
* and queries PageThumbsStorageService using the extracted URL to obtain
* the local file path of the screenshot. This should only be called from
* the parent because PageThumbsStorageService relies on the path of the
* profile directory, which is unavailable in the child.
*
* @param aPath the path of the moz-page-thumb URI.
* @param aHost the host of the moz-page-thumb URI.
* @param aThumbnailPath in/out string param referring to the thumbnail path.
* @return NS_OK if the thumbnail path was obtained successfully. Otherwise
* returns an error.
*/
nsresult GetThumbnailPath(const nsACString& aPath, const nsACString& aHost,
nsString& aThumbnailPath);
// To allow parent IPDL actors to invoke methods on this handler when
// handling moz-page-thumb requests from the child.
static StaticRefPtr<PageThumbProtocolHandler> sSingleton;
// Gets a SimpleChannel that wraps the provided channel.
static void NewSimpleChannel(nsIURI* aURI, nsILoadInfo* aLoadinfo,
RemoteStreamGetter* aStreamGetter,
nsIChannel** aRetVal);
};
} // namespace net
} // namespace mozilla
#endif /* PageThumbProtocolHandler_h___ */
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