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Diffstat (limited to 'netwerk/protocol/file/nsFileChannel.cpp')
| -rw-r--r-- | netwerk/protocol/file/nsFileChannel.cpp | 514 |
1 files changed, 514 insertions, 0 deletions
diff --git a/netwerk/protocol/file/nsFileChannel.cpp b/netwerk/protocol/file/nsFileChannel.cpp new file mode 100644 index 0000000000..6dc5f6780b --- /dev/null +++ b/netwerk/protocol/file/nsFileChannel.cpp @@ -0,0 +1,514 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et cin: */ +/* 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 "nsIOService.h" +#include "nsFileChannel.h" +#include "nsBaseContentStream.h" +#include "nsDirectoryIndexStream.h" +#include "nsThreadUtils.h" +#include "nsTransportUtils.h" +#include "nsStreamUtils.h" +#include "nsMimeTypes.h" +#include "nsNetUtil.h" +#include "nsNetCID.h" +#include "nsIOutputStream.h" +#include "nsIFileStreams.h" +#include "nsFileProtocolHandler.h" +#include "nsProxyRelease.h" +#include "nsIContentPolicy.h" +#include "nsContentUtils.h" + +#include "nsIFileURL.h" +#include "nsIURIMutator.h" +#include "nsIFile.h" +#include "nsIMIMEService.h" +#include "prio.h" +#include <algorithm> + +#include "mozilla/TaskQueue.h" +#include "mozilla/Unused.h" + +using namespace mozilla; +using namespace mozilla::net; + +//----------------------------------------------------------------------------- + +class nsFileCopyEvent : public Runnable { + public: + nsFileCopyEvent(nsIOutputStream* dest, nsIInputStream* source, int64_t len) + : mozilla::Runnable("nsFileCopyEvent"), + mDest(dest), + mSource(source), + mLen(len), + mStatus(NS_OK), + mInterruptStatus(NS_OK) {} + + // Read the current status of the file copy operation. + nsresult Status() { return mStatus; } + + // Call this method to perform the file copy synchronously. + void DoCopy(); + + // Call this method to perform the file copy on a background thread. The + // callback is dispatched when the file copy completes. + nsresult Dispatch(nsIRunnable* callback, nsITransportEventSink* sink, + nsIEventTarget* target); + + // Call this method to interrupt a file copy operation that is occuring on + // a background thread. The status parameter passed to this function must + // be a failure code and is set as the status of this file copy operation. + void Interrupt(nsresult status) { + NS_ASSERTION(NS_FAILED(status), "must be a failure code"); + mInterruptStatus = status; + } + + NS_IMETHOD Run() override { + DoCopy(); + return NS_OK; + } + + private: + nsCOMPtr<nsIEventTarget> mCallbackTarget; + nsCOMPtr<nsIRunnable> mCallback; + nsCOMPtr<nsITransportEventSink> mSink; + nsCOMPtr<nsIOutputStream> mDest; + nsCOMPtr<nsIInputStream> mSource; + int64_t mLen; + nsresult mStatus; // modified on i/o thread only + nsresult mInterruptStatus; // modified on main thread only +}; + +void nsFileCopyEvent::DoCopy() { + // We'll copy in chunks this large by default. This size affects how + // frequently we'll check for interrupts. + const int32_t chunk = + nsIOService::gDefaultSegmentSize * nsIOService::gDefaultSegmentCount; + + nsresult rv = NS_OK; + + int64_t len = mLen, progress = 0; + while (len) { + // If we've been interrupted, then stop copying. + rv = mInterruptStatus; + if (NS_FAILED(rv)) break; + + int32_t num = std::min((int32_t)len, chunk); + + uint32_t result; + rv = mSource->ReadSegments(NS_CopySegmentToStream, mDest, num, &result); + if (NS_FAILED(rv)) break; + if (result != (uint32_t)num) { + // stopped prematurely (out of disk space) + rv = NS_ERROR_FILE_NO_DEVICE_SPACE; + break; + } + + // Dispatch progress notification + if (mSink) { + progress += num; + mSink->OnTransportStatus(nullptr, NS_NET_STATUS_WRITING, progress, mLen); + } + + len -= num; + } + + if (NS_FAILED(rv)) mStatus = rv; + + // Close the output stream before notifying our callback so that others may + // freely "play" with the file. + mDest->Close(); + + // Notify completion + if (mCallback) { + mCallbackTarget->Dispatch(mCallback, NS_DISPATCH_NORMAL); + + // Release the callback on the target thread to avoid destroying stuff on + // the wrong thread. + NS_ProxyRelease("nsFileCopyEvent::mCallback", mCallbackTarget, + mCallback.forget()); + } +} + +nsresult nsFileCopyEvent::Dispatch(nsIRunnable* callback, + nsITransportEventSink* sink, + nsIEventTarget* target) { + // Use the supplied event target for all asynchronous operations. + + mCallback = callback; + mCallbackTarget = target; + + // Build a coalescing proxy for progress events + nsresult rv = + net_NewTransportEventSinkProxy(getter_AddRefs(mSink), sink, target); + + if (NS_FAILED(rv)) return rv; + + // Dispatch ourselves to I/O thread pool... + nsCOMPtr<nsIEventTarget> pool = + do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv); + if (NS_FAILED(rv)) return rv; + + return pool->Dispatch(this, NS_DISPATCH_NORMAL); +} + +//----------------------------------------------------------------------------- + +// This is a dummy input stream that when read, performs the file copy. The +// copy happens on a background thread via mCopyEvent. + +class nsFileUploadContentStream : public nsBaseContentStream { + public: + NS_INLINE_DECL_REFCOUNTING_INHERITED(nsFileUploadContentStream, + nsBaseContentStream) + + nsFileUploadContentStream(bool nonBlocking, nsIOutputStream* dest, + nsIInputStream* source, int64_t len, + nsITransportEventSink* sink) + : nsBaseContentStream(nonBlocking), + mCopyEvent(new nsFileCopyEvent(dest, source, len)), + mSink(sink) {} + + bool IsInitialized() { return mCopyEvent != nullptr; } + + NS_IMETHOD ReadSegments(nsWriteSegmentFun fun, void* closure, uint32_t count, + uint32_t* result) override; + NS_IMETHOD AsyncWait(nsIInputStreamCallback* callback, uint32_t flags, + uint32_t count, nsIEventTarget* target) override; + + private: + virtual ~nsFileUploadContentStream() = default; + + void OnCopyComplete(); + + RefPtr<nsFileCopyEvent> mCopyEvent; + nsCOMPtr<nsITransportEventSink> mSink; +}; + +NS_IMETHODIMP +nsFileUploadContentStream::ReadSegments(nsWriteSegmentFun fun, void* closure, + uint32_t count, uint32_t* result) { + *result = 0; // nothing is ever actually read from this stream + + if (IsClosed()) return NS_OK; + + if (IsNonBlocking()) { + // Inform the caller that they will have to wait for the copy operation to + // complete asynchronously. We'll kick of the copy operation once they + // call AsyncWait. + return NS_BASE_STREAM_WOULD_BLOCK; + } + + // Perform copy synchronously, and then close out the stream. + mCopyEvent->DoCopy(); + nsresult status = mCopyEvent->Status(); + CloseWithStatus(NS_FAILED(status) ? status : NS_BASE_STREAM_CLOSED); + return status; +} + +NS_IMETHODIMP +nsFileUploadContentStream::AsyncWait(nsIInputStreamCallback* callback, + uint32_t flags, uint32_t count, + nsIEventTarget* target) { + nsresult rv = nsBaseContentStream::AsyncWait(callback, flags, count, target); + if (NS_FAILED(rv) || IsClosed()) return rv; + + if (IsNonBlocking()) { + nsCOMPtr<nsIRunnable> callback = + NewRunnableMethod("nsFileUploadContentStream::OnCopyComplete", this, + &nsFileUploadContentStream::OnCopyComplete); + mCopyEvent->Dispatch(callback, mSink, target); + } + + return NS_OK; +} + +void nsFileUploadContentStream::OnCopyComplete() { + // This method is being called to indicate that we are done copying. + nsresult status = mCopyEvent->Status(); + + CloseWithStatus(NS_FAILED(status) ? status : NS_BASE_STREAM_CLOSED); +} + +//----------------------------------------------------------------------------- + +nsFileChannel::nsFileChannel(nsIURI* uri) : mUploadLength(0), mFileURI(uri) {} + +nsresult nsFileChannel::Init() { + NS_ENSURE_STATE(mLoadInfo); + + // If we have a link file, we should resolve its target right away. + // This is to protect against a same origin attack where the same link file + // can point to different resources right after the first resource is loaded. + nsCOMPtr<nsIFile> file; + nsCOMPtr<nsIURI> targetURI; +#ifdef XP_WIN + nsAutoString fileTarget; +#else + nsAutoCString fileTarget; +#endif + nsCOMPtr<nsIFile> resolvedFile; + bool symLink; + nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(mFileURI); + if (fileURL && NS_SUCCEEDED(fileURL->GetFile(getter_AddRefs(file))) && + NS_SUCCEEDED(file->IsSymlink(&symLink)) && symLink && +#ifdef XP_WIN + NS_SUCCEEDED(file->GetTarget(fileTarget)) && + NS_SUCCEEDED( + NS_NewLocalFile(fileTarget, true, getter_AddRefs(resolvedFile))) && +#else + NS_SUCCEEDED(file->GetNativeTarget(fileTarget)) && + NS_SUCCEEDED(NS_NewNativeLocalFile(fileTarget, true, + getter_AddRefs(resolvedFile))) && +#endif + NS_SUCCEEDED( + NS_NewFileURI(getter_AddRefs(targetURI), resolvedFile, nullptr))) { + // Make an effort to match up the query strings. + nsCOMPtr<nsIURL> origURL = do_QueryInterface(mFileURI); + nsCOMPtr<nsIURL> targetURL = do_QueryInterface(targetURI); + nsAutoCString queryString; + if (origURL && targetURL && NS_SUCCEEDED(origURL->GetQuery(queryString))) { + Unused + << NS_MutateURI(targetURI).SetQuery(queryString).Finalize(targetURI); + } + + SetURI(targetURI); + SetOriginalURI(mFileURI); + mLoadInfo->SetResultPrincipalURI(targetURI); + } else { + SetURI(mFileURI); + } + + return NS_OK; +} + +nsresult nsFileChannel::MakeFileInputStream(nsIFile* file, + nsCOMPtr<nsIInputStream>& stream, + nsCString& contentType, + bool async) { + // we accept that this might result in a disk hit to stat the file + bool isDir; + nsresult rv = file->IsDirectory(&isDir); + if (NS_FAILED(rv)) { + if (rv == NS_ERROR_FILE_NOT_FOUND) { + CheckForBrokenChromeURL(mLoadInfo, OriginalURI()); + } + + if (async && (NS_ERROR_FILE_NOT_FOUND == rv)) { + // We don't return "Not Found" errors here. Since we could not find + // the file, it's not a directory anyway. + isDir = false; + } else { + return rv; + } + } + + if (isDir) { + rv = nsDirectoryIndexStream::Create(file, getter_AddRefs(stream)); + if (NS_SUCCEEDED(rv) && !HasContentTypeHint()) { + contentType.AssignLiteral(APPLICATION_HTTP_INDEX_FORMAT); + } + } else { + rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), file, -1, -1, + async ? nsIFileInputStream::DEFER_OPEN : 0); + if (NS_SUCCEEDED(rv) && !HasContentTypeHint()) { + // Use file extension to infer content type + nsCOMPtr<nsIMIMEService> mime = do_GetService("@mozilla.org/mime;1", &rv); + if (NS_SUCCEEDED(rv)) { + mime->GetTypeFromFile(file, contentType); + } + } + } + return rv; +} + +nsresult nsFileChannel::OpenContentStream(bool async, nsIInputStream** result, + nsIChannel** channel) { + // NOTE: the resulting file is a clone, so it is safe to pass it to the + // file input stream which will be read on a background thread. + nsCOMPtr<nsIFile> file; + nsresult rv = GetFile(getter_AddRefs(file)); + if (NS_FAILED(rv)) return rv; + + nsCOMPtr<nsIFileProtocolHandler> fileHandler; + rv = NS_GetFileProtocolHandler(getter_AddRefs(fileHandler)); + if (NS_FAILED(rv)) return rv; + + nsCOMPtr<nsIURI> newURI; + if (NS_SUCCEEDED(fileHandler->ReadURLFile(file, getter_AddRefs(newURI))) || + NS_SUCCEEDED(fileHandler->ReadShellLink(file, getter_AddRefs(newURI)))) { + nsCOMPtr<nsIChannel> newChannel; + rv = NS_NewChannel(getter_AddRefs(newChannel), newURI, + nsContentUtils::GetSystemPrincipal(), + nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL, + nsIContentPolicy::TYPE_OTHER); + + if (NS_FAILED(rv)) return rv; + + *result = nullptr; + newChannel.forget(channel); + return NS_OK; + } + + nsCOMPtr<nsIInputStream> stream; + + if (mUploadStream) { + // Pass back a nsFileUploadContentStream instance that knows how to perform + // the file copy when "read" (the resulting stream in this case does not + // actually return any data). + + nsCOMPtr<nsIOutputStream> fileStream; + rv = NS_NewLocalFileOutputStream(getter_AddRefs(fileStream), file, + PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE, + PR_IRUSR | PR_IWUSR); + if (NS_FAILED(rv)) return rv; + + RefPtr<nsFileUploadContentStream> uploadStream = + new nsFileUploadContentStream(async, fileStream, mUploadStream, + mUploadLength, this); + if (!uploadStream || !uploadStream->IsInitialized()) { + return NS_ERROR_OUT_OF_MEMORY; + } + stream = std::move(uploadStream); + + mContentLength = 0; + + // Since there isn't any content to speak of we just set the content-type + // to something other than "unknown" to avoid triggering the content-type + // sniffer code in nsBaseChannel. + // However, don't override explicitly set types. + if (!HasContentTypeHint()) { + SetContentType(nsLiteralCString(APPLICATION_OCTET_STREAM)); + } + } else { + nsAutoCString contentType; + rv = MakeFileInputStream(file, stream, contentType, async); + if (NS_FAILED(rv)) return rv; + + EnableSynthesizedProgressEvents(true); + + // fixup content length and type + + // when we are called from asyncOpen, the content length fixup will be + // performed on a background thread and block the listener invocation via + // ListenerBlockingPromise method + if (!async && mContentLength < 0) { + rv = FixupContentLength(false); + if (NS_FAILED(rv)) { + return rv; + } + } + + if (!contentType.IsEmpty()) { + SetContentType(contentType); + } + } + + *result = nullptr; + stream.swap(*result); + return NS_OK; +} + +nsresult nsFileChannel::ListenerBlockingPromise(BlockingPromise** aPromise) { + NS_ENSURE_ARG(aPromise); + *aPromise = nullptr; + + if (mContentLength >= 0) { + return NS_OK; + } + + nsCOMPtr<nsIEventTarget> sts( + do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID)); + if (!sts) { + return FixupContentLength(true); + } + + RefPtr<TaskQueue> taskQueue = TaskQueue::Create(sts.forget(), "FileChannel"); + RefPtr<nsFileChannel> self = this; + RefPtr<BlockingPromise> promise = + mozilla::InvokeAsync(taskQueue, __func__, [self{std::move(self)}]() { + nsresult rv = self->FixupContentLength(true); + if (NS_FAILED(rv)) { + return BlockingPromise::CreateAndReject(rv, __func__); + } + return BlockingPromise::CreateAndResolve(NS_OK, __func__); + }); + + promise.forget(aPromise); + return NS_OK; +} + +nsresult nsFileChannel::FixupContentLength(bool async) { + MOZ_ASSERT(mContentLength < 0); + + nsCOMPtr<nsIFile> file; + nsresult rv = GetFile(getter_AddRefs(file)); + if (NS_FAILED(rv)) { + return rv; + } + + int64_t size; + rv = file->GetFileSize(&size); + if (NS_FAILED(rv)) { + if (async && NS_ERROR_FILE_NOT_FOUND == rv) { + size = 0; + } else { + return rv; + } + } + mContentLength = size; + + return NS_OK; +} + +//----------------------------------------------------------------------------- +// nsFileChannel::nsISupports + +NS_IMPL_ISUPPORTS_INHERITED(nsFileChannel, nsBaseChannel, nsIUploadChannel, + nsIFileChannel) + +//----------------------------------------------------------------------------- +// nsFileChannel::nsIFileChannel + +NS_IMETHODIMP +nsFileChannel::GetFile(nsIFile** file) { + nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(URI()); + NS_ENSURE_STATE(fileURL); + + // This returns a cloned nsIFile + return fileURL->GetFile(file); +} + +//----------------------------------------------------------------------------- +// nsFileChannel::nsIUploadChannel + +NS_IMETHODIMP +nsFileChannel::SetUploadStream(nsIInputStream* stream, + const nsACString& contentType, + int64_t contentLength) { + NS_ENSURE_TRUE(!Pending(), NS_ERROR_IN_PROGRESS); + + if ((mUploadStream = stream)) { + mUploadLength = contentLength; + if (mUploadLength < 0) { + // Make sure we know how much data we are uploading. + uint64_t avail; + nsresult rv = mUploadStream->Available(&avail); + if (NS_FAILED(rv)) return rv; + // if this doesn't fit in the javascript MAX_SAFE_INTEGER + // pretend we don't know the size + mUploadLength = InScriptableRange(avail) ? avail : -1; + } + } else { + mUploadLength = -1; + } + return NS_OK; +} + +NS_IMETHODIMP +nsFileChannel::GetUploadStream(nsIInputStream** result) { + *result = do_AddRef(mUploadStream).take(); + return NS_OK; +} |