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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsBaseChannel_h__
+#define nsBaseChannel_h__
+
+#include "mozilla/Maybe.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/net/NeckoTargetHolder.h"
+#include "mozilla/net/PrivateBrowsingChannel.h"
+#include "nsHashPropertyBag.h"
+#include "nsIAsyncVerifyRedirectCallback.h"
+#include "nsIChannel.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsILoadGroup.h"
+#include "nsILoadInfo.h"
+#include "nsIProgressEventSink.h"
+#include "nsIStreamListener.h"
+#include "nsIThreadRetargetableRequest.h"
+#include "nsIThreadRetargetableStreamListener.h"
+#include "nsITransport.h"
+#include "nsITransportSecurityInfo.h"
+#include "nsIURI.h"
+#include "nsInputStreamPump.h"
+#include "nsString.h"
+#include "nsThreadUtils.h"
+#include "nsCOMPtr.h"
+
+class nsIInputStream;
+class nsICancelable;
+
+//-----------------------------------------------------------------------------
+// nsBaseChannel is designed to be subclassed. The subclass is responsible for
+// implementing the OpenContentStream method, which will be called by the
+// nsIChannel::AsyncOpen and nsIChannel::Open implementations.
+//
+// nsBaseChannel implements nsIInterfaceRequestor to provide a convenient way
+// for subclasses to query both the nsIChannel::notificationCallbacks and
+// nsILoadGroup::notificationCallbacks for supported interfaces.
+//
+// nsBaseChannel implements nsITransportEventSink to support progress & status
+// notifications generated by the transport layer.
+
+class nsBaseChannel
+ : public nsHashPropertyBag,
+ public nsIChannel,
+ public nsIThreadRetargetableRequest,
+ public nsIInterfaceRequestor,
+ public nsITransportEventSink,
+ public nsIAsyncVerifyRedirectCallback,
+ public mozilla::net::PrivateBrowsingChannel<nsBaseChannel>,
+ public mozilla::net::NeckoTargetHolder,
+ protected nsIThreadRetargetableStreamListener {
+ public:
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_NSIREQUEST
+ NS_DECL_NSICHANNEL
+ NS_DECL_NSIINTERFACEREQUESTOR
+ NS_DECL_NSITRANSPORTEVENTSINK
+ NS_DECL_NSIASYNCVERIFYREDIRECTCALLBACK
+ NS_DECL_NSITHREADRETARGETABLEREQUEST
+ NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
+
+ nsBaseChannel();
+
+ protected:
+ // -----------------------------------------------
+ // Methods to be implemented by the derived class:
+
+ virtual ~nsBaseChannel();
+
+ using BlockingPromise = mozilla::MozPromise<nsresult, nsresult, true>;
+
+ private:
+ // Implemented by subclass to supply data stream. The parameter, async, is
+ // true when called from nsIChannel::AsyncOpen and false otherwise. When
+ // async is true, the resulting stream will be used with a nsIInputStreamPump
+ // instance. This means that if it is a non-blocking stream that supports
+ // nsIAsyncInputStream that it will be read entirely on the main application
+ // thread, and its AsyncWait method will be called whenever ReadSegments
+ // returns NS_BASE_STREAM_WOULD_BLOCK. Otherwise, if the stream is blocking,
+ // then it will be read on one of the background I/O threads, and it does not
+ // need to implement ReadSegments. If async is false, this method may return
+ // NS_ERROR_NOT_IMPLEMENTED to cause the basechannel to implement Open in
+ // terms of AsyncOpen (see NS_ImplementChannelOpen).
+ // A callee is allowed to return an nsIChannel instead of an nsIInputStream.
+ // That case will be treated as a redirect to the new channel. By default
+ // *channel will be set to null by the caller, so callees who don't want to
+ // return one an just not touch it.
+ virtual nsresult OpenContentStream(bool async, nsIInputStream** stream,
+ nsIChannel** channel) = 0;
+
+ // Implemented by subclass to begin pumping data for an async channel, in
+ // lieu of returning a stream. If implemented, OpenContentStream will never
+ // be called for async channels. If not implemented, AsyncOpen will fall
+ // back to OpenContentStream.
+ //
+ // On success, the callee must begin pumping data to the stream listener,
+ // and at some point call OnStartRequest followed by OnStopRequest.
+ //
+ // Additionally, when a successful nsresult is returned, then the subclass
+ // should be setting through its two out params either:
+ // - a request object, which may be used to suspend, resume, and cancel
+ // the underlying request.
+ // - or a cancelable object (e.g. when a request can't be returned right away
+ // due to some async work needed to retrieve it). which may be used to
+ // cancel the underlying request (e.g. because the channel has been
+ // canceled)
+ //
+ // Not returning a request or cancelable leads to potentially leaking the
+ // an underling stream pump (which would keep to be pumping data even after
+ // the channel has been canceled and nothing is going to handle the data
+ // available, e.g. see Bug 1706594).
+ virtual nsresult BeginAsyncRead(nsIStreamListener* listener,
+ nsIRequest** request,
+ nsICancelable** cancelableRequest) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+ }
+
+ // This method may return a promise that will keep the input stream pump
+ // suspended until the promise is resolved or rejected. On resolution the
+ // pump is resumed. On rejection the channel is canceled with the resulting
+ // error and then the pump is also resumed to propagate the error to the
+ // channel listener. Use it to do any asynchronous/background tasks you need
+ // to finish prior calling OnStartRequest of the listener. This method is
+ // called right after OpenContentStream() with async == true, after the input
+ // stream pump has already been called asyncRead().
+ virtual nsresult ListenerBlockingPromise(BlockingPromise** aPromise) {
+ NS_ENSURE_ARG(aPromise);
+ *aPromise = nullptr;
+ return NS_OK;
+ }
+
+ // The basechannel calls this method from its OnTransportStatus method to
+ // determine whether to call nsIProgressEventSink::OnStatus in addition to
+ // nsIProgressEventSink::OnProgress. This method may be overriden by the
+ // subclass to enable nsIProgressEventSink::OnStatus events. If this method
+ // returns true, then the statusArg out param specifies the "statusArg" value
+ // to pass to the OnStatus method. By default, OnStatus messages are
+ // suppressed. The status parameter passed to this method is the status value
+ // from the OnTransportStatus method.
+ virtual bool GetStatusArg(nsresult status, nsString& statusArg) {
+ return false;
+ }
+
+ // Called when the callbacks available to this channel may have changed.
+ virtual void OnCallbacksChanged() {}
+
+ // Called when our channel is done, to allow subclasses to drop resources.
+ virtual void OnChannelDone() {}
+
+ public:
+ // ----------------------------------------------
+ // Methods provided for use by the derived class:
+
+ // Redirect to another channel. This method takes care of notifying
+ // observers of this redirect as well as of opening the new channel, if asked
+ // to do so. It also cancels |this| with the status code
+ // NS_BINDING_REDIRECTED. A failure return from this method means that the
+ // redirect could not be performed (no channel was opened; this channel
+ // wasn't canceled.) The redirectFlags parameter consists of the flag values
+ // defined on nsIChannelEventSink.
+ nsresult Redirect(nsIChannel* newChannel, uint32_t redirectFlags,
+ bool openNewChannel);
+
+ // Tests whether a type hint was set. Subclasses can use this to decide
+ // whether to call SetContentType.
+ // NOTE: This is only reliable if the subclass didn't itself call
+ // SetContentType, and should also not be called after OpenContentStream.
+ bool HasContentTypeHint() const;
+
+ // The URI member should be initialized before the channel is used, and then
+ // it should never be changed again until the channel is destroyed.
+ nsIURI* URI() { return mURI; }
+ void SetURI(nsIURI* uri) {
+ NS_ASSERTION(uri, "must specify a non-null URI");
+ NS_ASSERTION(!mURI, "must not modify URI");
+ NS_ASSERTION(!mOriginalURI, "how did that get set so early?");
+ mURI = uri;
+ mOriginalURI = uri;
+ }
+ nsIURI* OriginalURI() { return mOriginalURI; }
+
+ // The security info is a property of the transport-layer, which should be
+ // assigned by the subclass.
+ nsITransportSecurityInfo* SecurityInfo() { return mSecurityInfo; }
+ void SetSecurityInfo(nsITransportSecurityInfo* info) { mSecurityInfo = info; }
+
+ // Test the load flags
+ bool HasLoadFlag(uint32_t flag) { return (mLoadFlags & flag) != 0; }
+
+ // This is a short-cut to calling nsIRequest::IsPending()
+ virtual bool Pending() const {
+ return mPumpingData || mWaitingOnAsyncRedirect;
+ }
+
+ // Blob requests may specify a range header. We must parse, validate, and
+ // store that info in a place where BlobURLInputStream::StoreBlobImplStream
+ // can access it. This class helps to encapsulate that logic.
+ class ContentRange {
+ private:
+ uint64_t mStart;
+ uint64_t mEnd;
+ uint64_t mSize;
+
+ public:
+ uint64_t Start() const { return mStart; }
+ uint64_t End() const { return mEnd; }
+ uint64_t Size() const { return mSize; }
+ bool IsValid() const { return mStart < mSize; }
+ ContentRange() : mStart(0), mEnd(0), mSize(0) {}
+ ContentRange(uint64_t aStart, uint64_t aEnd, uint64_t aSize)
+ : mStart(aStart), mEnd(aEnd), mSize(aSize) {}
+ ContentRange(const nsACString& aRangeHeader, uint64_t aSize);
+ void AsHeader(nsACString& aOutString) const;
+ };
+
+ const mozilla::Maybe<ContentRange>& GetContentRange() const {
+ return mContentRange;
+ }
+
+ void SetContentRange(uint64_t aStart, uint64_t aEnd, uint64_t aSize) {
+ mContentRange.emplace(ContentRange(aStart, aEnd, aSize));
+ }
+
+ bool SetContentRange(const nsACString& aRangeHeader, uint64_t aSize) {
+ auto range = ContentRange(aRangeHeader, aSize);
+ if (!range.IsValid()) {
+ return false;
+ }
+ mContentRange.emplace(range);
+ return true;
+ }
+
+ // Helper function for querying the channel's notification callbacks.
+ template <class T>
+ void GetCallback(nsCOMPtr<T>& result) {
+ GetInterface(NS_GET_TEMPLATE_IID(T), getter_AddRefs(result));
+ }
+
+ // If a subclass does not want to feed transport-layer progress events to the
+ // base channel via nsITransportEventSink, then it may set this flag to cause
+ // the base channel to synthesize progress events when it receives data from
+ // the content stream. By default, progress events are not synthesized.
+ void EnableSynthesizedProgressEvents(bool enable) {
+ mSynthProgressEvents = enable;
+ }
+
+ // Some subclasses may wish to manually insert a stream listener between this
+ // and the channel's listener. The following methods make that possible.
+ void SetStreamListener(nsIStreamListener* listener) { mListener = listener; }
+ nsIStreamListener* StreamListener() { return mListener; }
+
+ protected:
+ void DisallowThreadRetargeting() { mAllowThreadRetargeting = false; }
+
+ virtual void SetupNeckoTarget();
+
+ private:
+ NS_DECL_NSISTREAMLISTENER
+ NS_DECL_NSIREQUESTOBSERVER
+
+ // Called to setup mPump and call AsyncRead on it.
+ nsresult BeginPumpingData();
+
+ // Called when the callbacks available to this channel may have changed.
+ void CallbacksChanged() {
+ mProgressSink = nullptr;
+ mQueriedProgressSink = false;
+ OnCallbacksChanged();
+ }
+
+ // Called when our channel is done. This should drop no-longer-needed
+ // pointers.
+ void ChannelDone() {
+ mListener = nullptr;
+ OnChannelDone();
+ }
+
+ // Handle an async redirect callback. This will only be called if we
+ // returned success from AsyncOpen while posting a redirect runnable.
+ void HandleAsyncRedirect(nsIChannel* newChannel);
+ void ContinueHandleAsyncRedirect(nsresult result);
+ nsresult ContinueRedirect();
+
+ // start URI classifier if requested
+ void ClassifyURI();
+
+ class RedirectRunnable : public mozilla::Runnable {
+ public:
+ RedirectRunnable(nsBaseChannel* chan, nsIChannel* newChannel)
+ : mozilla::Runnable("nsBaseChannel::RedirectRunnable"),
+ mChannel(chan),
+ mNewChannel(newChannel) {
+ MOZ_ASSERT(newChannel, "Must have channel to redirect to");
+ }
+
+ NS_IMETHOD Run() override {
+ mChannel->HandleAsyncRedirect(mNewChannel);
+ return NS_OK;
+ }
+
+ private:
+ RefPtr<nsBaseChannel> mChannel;
+ nsCOMPtr<nsIChannel> mNewChannel;
+ };
+ friend class RedirectRunnable;
+
+ RefPtr<nsInputStreamPump> mPump;
+ RefPtr<nsIRequest> mRequest;
+ nsCOMPtr<nsICancelable> mCancelableAsyncRequest;
+ bool mPumpingData{false};
+ nsCOMPtr<nsIProgressEventSink> mProgressSink;
+ nsCOMPtr<nsIURI> mOriginalURI;
+ nsCOMPtr<nsISupports> mOwner;
+ nsCOMPtr<nsITransportSecurityInfo> mSecurityInfo;
+ nsCOMPtr<nsIChannel> mRedirectChannel;
+ uint32_t mLoadFlags{LOAD_NORMAL};
+ bool mQueriedProgressSink{true};
+ bool mSynthProgressEvents{false};
+ bool mAllowThreadRetargeting{true};
+ bool mWaitingOnAsyncRedirect{false};
+ bool mOpenRedirectChannel{false};
+ uint32_t mRedirectFlags{0};
+ mozilla::Maybe<ContentRange> mContentRange;
+
+ protected:
+ nsCString mContentType;
+ nsCString mContentCharset;
+ nsCOMPtr<nsIURI> mURI;
+ nsCOMPtr<nsILoadGroup> mLoadGroup;
+ nsCOMPtr<nsILoadInfo> mLoadInfo;
+ nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
+ nsCOMPtr<nsIStreamListener> mListener;
+ nsresult mStatus{NS_OK};
+ uint32_t mContentDispositionHint{UINT32_MAX};
+ mozilla::UniquePtr<nsString> mContentDispositionFilename;
+ int64_t mContentLength{-1};
+ bool mWasOpened{false};
+ bool mCanceled{false};
+
+ friend class mozilla::net::PrivateBrowsingChannel<nsBaseChannel>;
+};
+
+#endif // !nsBaseChannel_h__
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 11:24:05 +0000