| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "content/browser/download/download_request_core.h" |
| |
| #include <string> |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/format_macros.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/metrics/sparse_histogram.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/thread_task_runner_handle.h" |
| #include "content/browser/byte_stream.h" |
| #include "content/browser/download/download_create_info.h" |
| #include "content/browser/download/download_interrupt_reasons_impl.h" |
| #include "content/browser/download/download_manager_impl.h" |
| #include "content/browser/download/download_request_handle.h" |
| #include "content/browser/download/download_stats.h" |
| #include "content/browser/loader/resource_dispatcher_host_impl.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "content/public/browser/download_interrupt_reasons.h" |
| #include "content/public/browser/download_item.h" |
| #include "content/public/browser/download_manager_delegate.h" |
| #include "content/public/browser/navigation_entry.h" |
| #include "content/public/browser/power_save_blocker.h" |
| #include "content/public/browser/resource_context.h" |
| #include "content/public/browser/web_contents.h" |
| #include "net/base/elements_upload_data_stream.h" |
| #include "net/base/io_buffer.h" |
| #include "net/base/load_flags.h" |
| #include "net/base/net_errors.h" |
| #include "net/base/upload_bytes_element_reader.h" |
| #include "net/http/http_response_headers.h" |
| #include "net/http/http_status_code.h" |
| #include "net/url_request/url_request_context.h" |
| |
| namespace content { |
| |
| namespace { |
| |
| // This is a UserData::Data that will be attached to a URLRequest as a |
| // side-channel for passing download parameters. |
| class DownloadRequestData : public base::SupportsUserData::Data { |
| public: |
| ~DownloadRequestData() override {} |
| |
| static void Attach(net::URLRequest* request, |
| DownloadUrlParameters* download_parameters, |
| uint32_t download_id); |
| static DownloadRequestData* Get(net::URLRequest* request); |
| static void Detach(net::URLRequest* request); |
| |
| scoped_ptr<DownloadSaveInfo> TakeSaveInfo() { return std::move(save_info_); } |
| uint32_t download_id() const { return download_id_; } |
| const DownloadUrlParameters::OnStartedCallback& callback() const { |
| return on_started_callback_; |
| } |
| |
| private: |
| static const int kKey; |
| |
| scoped_ptr<DownloadSaveInfo> save_info_; |
| uint32_t download_id_ = DownloadItem::kInvalidId; |
| DownloadUrlParameters::OnStartedCallback on_started_callback_; |
| }; |
| |
| // static |
| const int DownloadRequestData::kKey = 0; |
| |
| // static |
| void DownloadRequestData::Attach(net::URLRequest* request, |
| DownloadUrlParameters* parameters, |
| uint32_t download_id) { |
| DownloadRequestData* request_data = new DownloadRequestData; |
| request_data->save_info_.reset( |
| new DownloadSaveInfo(parameters->GetSaveInfo())); |
| request_data->download_id_ = download_id; |
| request_data->on_started_callback_ = parameters->callback(); |
| request->SetUserData(&kKey, request_data); |
| } |
| |
| // static |
| DownloadRequestData* DownloadRequestData::Get(net::URLRequest* request) { |
| return static_cast<DownloadRequestData*>(request->GetUserData(&kKey)); |
| } |
| |
| // static |
| void DownloadRequestData::Detach(net::URLRequest* request) { |
| request->RemoveUserData(&kKey); |
| } |
| |
| } // namespace |
| |
| const int DownloadRequestCore::kDownloadByteStreamSize = 100 * 1024; |
| |
| // static |
| scoped_ptr<net::URLRequest> DownloadRequestCore::CreateRequestOnIOThread( |
| uint32_t download_id, |
| DownloadUrlParameters* params) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| DCHECK(download_id == DownloadItem::kInvalidId || |
| !params->content_initiated()) |
| << "Content initiated downloads shouldn't specify a download ID"; |
| |
| // ResourceDispatcherHost{Base} is-not-a URLRequest::Delegate, and |
| // DownloadUrlParameters can-not include resource_dispatcher_host_impl.h, so |
| // we must down cast. RDHI is the only subclass of RDH as of 2012 May 4. |
| scoped_ptr<net::URLRequest> request( |
| params->resource_context()->GetRequestContext()->CreateRequest( |
| params->url(), net::DEFAULT_PRIORITY, nullptr)); |
| request->set_method(params->method()); |
| |
| if (!params->post_body().empty()) { |
| const std::string& body = params->post_body(); |
| scoped_ptr<net::UploadElementReader> reader( |
| net::UploadOwnedBytesElementReader::CreateWithString(body)); |
| request->set_upload( |
| net::ElementsUploadDataStream::CreateWithReader(std::move(reader), 0)); |
| } |
| |
| if (params->post_id() >= 0) { |
| // The POST in this case does not have an actual body, and only works |
| // when retrieving data from cache. This is done because we don't want |
| // to do a re-POST without user consent, and currently don't have a good |
| // plan on how to display the UI for that. |
| DCHECK(params->prefer_cache()); |
| DCHECK_EQ("POST", params->method()); |
| std::vector<scoped_ptr<net::UploadElementReader>> element_readers; |
| request->set_upload(make_scoped_ptr(new net::ElementsUploadDataStream( |
| std::move(element_readers), params->post_id()))); |
| } |
| |
| int load_flags = request->load_flags(); |
| if (params->prefer_cache()) { |
| // If there is upload data attached, only retrieve from cache because there |
| // is no current mechanism to prompt the user for their consent for a |
| // re-post. For GETs, try to retrieve data from the cache and skip |
| // validating the entry if present. |
| if (request->get_upload()) |
| load_flags |= net::LOAD_ONLY_FROM_CACHE; |
| else |
| load_flags |= net::LOAD_PREFERRING_CACHE; |
| } else { |
| load_flags |= net::LOAD_DISABLE_CACHE; |
| } |
| request->SetLoadFlags(load_flags); |
| |
| bool has_last_modified = !params->last_modified().empty(); |
| bool has_etag = !params->etag().empty(); |
| |
| // If we've asked for a range, we want to make sure that we only get that |
| // range if our current copy of the information is good. We shouldn't be |
| // asked to continue if we don't have a verifier. |
| DCHECK(params->offset() == 0 || has_etag || has_last_modified); |
| |
| // If we're not at the beginning of the file, retrieve only the remaining |
| // portion. |
| if (params->offset() > 0 && (has_etag || has_last_modified)) { |
| request->SetExtraRequestHeaderByName( |
| "Range", base::StringPrintf("bytes=%" PRId64 "-", params->offset()), |
| true); |
| |
| // In accordance with RFC 2616 Section 14.27, use If-Range to specify that |
| // the server return the entire entity if the validator doesn't match. |
| // Last-Modified can be used in the absence of ETag as a validator if the |
| // response headers satisfied the HttpUtil::HasStrongValidators() predicate. |
| // |
| // This function assumes that HasStrongValidators() was true and that the |
| // ETag and Last-Modified header values supplied are valid. |
| request->SetExtraRequestHeaderByName( |
| "If-Range", has_etag ? params->etag() : params->last_modified(), true); |
| } |
| |
| for (const auto& header : params->request_headers()) |
| request->SetExtraRequestHeaderByName(header.first, header.second, |
| false /*overwrite*/); |
| |
| DownloadRequestData::Attach(request.get(), std::move(params), download_id); |
| return request; |
| } |
| |
| DownloadRequestCore::DownloadRequestCore(net::URLRequest* request, |
| Delegate* delegate) |
| : delegate_(delegate), |
| request_(request), |
| download_id_(DownloadItem::kInvalidId), |
| last_buffer_size_(0), |
| bytes_read_(0), |
| pause_count_(0), |
| was_deferred_(false), |
| is_partial_request_(false), |
| started_(false), |
| abort_reason_(DOWNLOAD_INTERRUPT_REASON_NONE) { |
| DCHECK(request_); |
| DCHECK(delegate_); |
| RecordDownloadCount(UNTHROTTLED_COUNT); |
| power_save_blocker_ = PowerSaveBlocker::Create( |
| PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension, |
| PowerSaveBlocker::kReasonOther, "Download in progress"); |
| DownloadRequestData* request_data = DownloadRequestData::Get(request_); |
| if (request_data) { |
| save_info_ = request_data->TakeSaveInfo(); |
| download_id_ = request_data->download_id(); |
| on_started_callback_ = request_data->callback(); |
| DownloadRequestData::Detach(request_); |
| is_partial_request_ = save_info_->offset > 0; |
| } else { |
| save_info_.reset(new DownloadSaveInfo); |
| } |
| } |
| |
| DownloadRequestCore::~DownloadRequestCore() { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| // Remove output stream callback if a stream exists. |
| if (stream_writer_) |
| stream_writer_->RegisterCallback(base::Closure()); |
| |
| UMA_HISTOGRAM_TIMES("SB2.DownloadDuration", |
| base::TimeTicks::Now() - download_start_time_); |
| } |
| |
| scoped_ptr<DownloadCreateInfo> DownloadRequestCore::CreateDownloadCreateInfo( |
| DownloadInterruptReason result) { |
| DCHECK(!started_); |
| started_ = true; |
| scoped_ptr<DownloadCreateInfo> create_info(new DownloadCreateInfo( |
| base::Time::Now(), request()->net_log(), std::move(save_info_))); |
| |
| if (result == DOWNLOAD_INTERRUPT_REASON_NONE) |
| create_info->remote_address = request()->GetSocketAddress().host(); |
| create_info->url_chain = request()->url_chain(); |
| create_info->referrer_url = GURL(request()->referrer()); |
| create_info->result = result; |
| create_info->download_id = download_id_; |
| return create_info; |
| } |
| |
| bool DownloadRequestCore::OnResponseStarted( |
| const std::string& override_mime_type) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| DVLOG(20) << __FUNCTION__ << "()" << DebugString(); |
| download_start_time_ = base::TimeTicks::Now(); |
| |
| DownloadInterruptReason result = |
| request()->response_headers() |
| ? HandleSuccessfulServerResponse(*request()->response_headers(), |
| save_info_.get()) |
| : DOWNLOAD_INTERRUPT_REASON_NONE; |
| |
| scoped_ptr<DownloadCreateInfo> create_info = CreateDownloadCreateInfo(result); |
| if (result != DOWNLOAD_INTERRUPT_REASON_NONE) { |
| delegate_->OnStart(std::move(create_info), scoped_ptr<ByteStreamReader>(), |
| base::ResetAndReturn(&on_started_callback_)); |
| return false; |
| } |
| |
| // If it's a download, we don't want to poison the cache with it. |
| request()->StopCaching(); |
| |
| // Lower priority as well, so downloads don't contend for resources |
| // with main frames. |
| request()->SetPriority(net::IDLE); |
| |
| // If the content-length header is not present (or contains something other |
| // than numbers), the incoming content_length is -1 (unknown size). |
| // Set the content length to 0 to indicate unknown size to DownloadManager. |
| int64_t content_length = request()->GetExpectedContentSize() > 0 |
| ? request()->GetExpectedContentSize() |
| : 0; |
| create_info->total_bytes = content_length; |
| |
| // Create the ByteStream for sending data to the download sink. |
| scoped_ptr<ByteStreamReader> stream_reader; |
| CreateByteStream( |
| base::ThreadTaskRunnerHandle::Get(), |
| BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE), |
| kDownloadByteStreamSize, &stream_writer_, &stream_reader); |
| stream_writer_->RegisterCallback( |
| base::Bind(&DownloadRequestCore::ResumeRequest, AsWeakPtr())); |
| |
| if (!override_mime_type.empty()) |
| create_info->mime_type = override_mime_type; |
| else |
| request()->GetMimeType(&create_info->mime_type); |
| |
| // Get the last modified time and etag. |
| const net::HttpResponseHeaders* headers = request()->response_headers(); |
| if (headers) { |
| if (headers->HasStrongValidators()) { |
| // If we don't have strong validators as per RFC 2616 section 13.3.3, then |
| // we neither store nor use them for range requests. |
| if (!headers->EnumerateHeader(nullptr, "Last-Modified", |
| &create_info->last_modified)) |
| create_info->last_modified.clear(); |
| if (!headers->EnumerateHeader(nullptr, "ETag", &create_info->etag)) |
| create_info->etag.clear(); |
| } |
| |
| // Grab the first content-disposition header. There may be more than one, |
| // though as of this writing, the network stack ensures if there are, they |
| // are all duplicates. |
| headers->EnumerateHeader(nullptr, "Content-Disposition", |
| &create_info->content_disposition); |
| |
| if (!headers->GetMimeType(&create_info->original_mime_type)) |
| create_info->original_mime_type.clear(); |
| } |
| |
| // Blink verifies that the requester of this download is allowed to set a |
| // suggested name for the security origin of the download URL. However, this |
| // assumption doesn't hold if there were cross origin redirects. Therefore, |
| // clear the suggested_name for such requests. |
| if (create_info->url_chain.size() > 1 && |
| create_info->url_chain.front().GetOrigin() != |
| create_info->url_chain.back().GetOrigin()) |
| create_info->save_info->suggested_name.clear(); |
| |
| RecordDownloadMimeType(create_info->mime_type); |
| RecordDownloadContentDisposition(create_info->content_disposition); |
| |
| delegate_->OnStart(std::move(create_info), std::move(stream_reader), |
| base::ResetAndReturn(&on_started_callback_)); |
| return true; |
| } |
| |
| bool DownloadRequestCore::OnRequestRedirected() { |
| DVLOG(20) << __FUNCTION__ << "() " << DebugString(); |
| if (is_partial_request_) { |
| // A redirect while attempting a partial resumption indicates a potential |
| // middle box. Trigger another interruption so that the DownloadItem can |
| // retry. |
| abort_reason_ = DOWNLOAD_INTERRUPT_REASON_SERVER_UNREACHABLE; |
| return false; |
| } |
| return true; |
| } |
| |
| // Create a new buffer, which will be handed to the download thread for file |
| // writing and deletion. |
| bool DownloadRequestCore::OnWillRead(scoped_refptr<net::IOBuffer>* buf, |
| int* buf_size, |
| int min_size) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| DCHECK(buf && buf_size); |
| DCHECK(!read_buffer_.get()); |
| |
| *buf_size = min_size < 0 ? kReadBufSize : min_size; |
| last_buffer_size_ = *buf_size; |
| read_buffer_ = new net::IOBuffer(*buf_size); |
| *buf = read_buffer_.get(); |
| return true; |
| } |
| |
| // Pass the buffer to the download file writer. |
| bool DownloadRequestCore::OnReadCompleted(int bytes_read, bool* defer) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| DCHECK(read_buffer_.get()); |
| |
| base::TimeTicks now(base::TimeTicks::Now()); |
| if (!last_read_time_.is_null()) { |
| double seconds_since_last_read = (now - last_read_time_).InSecondsF(); |
| if (now == last_read_time_) |
| // Use 1/10 ms as a "very small number" so that we avoid |
| // divide-by-zero error and still record a very high potential bandwidth. |
| seconds_since_last_read = 0.00001; |
| |
| double actual_bandwidth = (bytes_read) / seconds_since_last_read; |
| double potential_bandwidth = last_buffer_size_ / seconds_since_last_read; |
| RecordBandwidth(actual_bandwidth, potential_bandwidth); |
| } |
| last_read_time_ = now; |
| |
| if (!bytes_read) |
| return true; |
| bytes_read_ += bytes_read; |
| DCHECK(read_buffer_.get()); |
| |
| // Take the data ship it down the stream. If the stream is full, pause the |
| // request; the stream callback will resume it. |
| if (!stream_writer_->Write(read_buffer_, bytes_read)) { |
| PauseRequest(); |
| *defer = was_deferred_ = true; |
| last_stream_pause_time_ = now; |
| } |
| |
| read_buffer_ = NULL; // Drop our reference. |
| |
| if (pause_count_ > 0) |
| *defer = was_deferred_ = true; |
| |
| return true; |
| } |
| |
| void DownloadRequestCore::OnWillAbort(DownloadInterruptReason reason) { |
| DVLOG(20) << __FUNCTION__ << "() reason=" << reason << " " << DebugString(); |
| DCHECK(!started_); |
| abort_reason_ = reason; |
| } |
| |
| void DownloadRequestCore::OnResponseCompleted( |
| const net::URLRequestStatus& status) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| int response_code = status.is_success() ? request()->GetResponseCode() : 0; |
| DVLOG(20) << __FUNCTION__ << "()" << DebugString() |
| << " status.status() = " << status.status() |
| << " status.error() = " << status.error() |
| << " response_code = " << response_code; |
| |
| DownloadInterruptReason reason = HandleRequestStatus(status); |
| |
| if (status.status() == net::URLRequestStatus::CANCELED) { |
| if (abort_reason_ != DOWNLOAD_INTERRUPT_REASON_NONE) { |
| // If a more specific interrupt reason was specified before the request |
| // was explicitly cancelled, then use it. |
| reason = abort_reason_; |
| } else if (status.error() == net::ERR_ABORTED) { |
| // CANCELED + ERR_ABORTED == something outside of the network |
| // stack cancelled the request. There aren't that many things that |
| // could do this to a download request (whose lifetime is separated from |
| // the tab from which it came). We map this to USER_CANCELLED as the |
| // case we know about (system suspend because of laptop close) corresponds |
| // to a user action. |
| // TODO(asanka): A lid close or other power event should result in an |
| // interruption that doesn't discard the partial state, unlike |
| // USER_CANCELLED. (https://crbug.com/166179) |
| if (net::IsCertStatusError(request()->ssl_info().cert_status)) |
| reason = DOWNLOAD_INTERRUPT_REASON_SERVER_CERT_PROBLEM; |
| else |
| reason = DOWNLOAD_INTERRUPT_REASON_USER_CANCELED; |
| } |
| } |
| |
| std::string accept_ranges; |
| bool has_strong_validators = false; |
| if (request()->response_headers()) { |
| request()->response_headers()->EnumerateHeader(nullptr, "Accept-Ranges", |
| &accept_ranges); |
| has_strong_validators = |
| request()->response_headers()->HasStrongValidators(); |
| } |
| RecordAcceptsRanges(accept_ranges, bytes_read_, has_strong_validators); |
| RecordNetworkBlockage(base::TimeTicks::Now() - download_start_time_, |
| total_pause_time_); |
| |
| // Send the info down the stream. Conditional is in case we get |
| // OnResponseCompleted without OnResponseStarted. |
| if (stream_writer_) |
| stream_writer_->Close(reason); |
| |
| // If the error mapped to something unknown, record it so that |
| // we can drill down. |
| if (reason == DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED) { |
| UMA_HISTOGRAM_SPARSE_SLOWLY("Download.MapErrorNetworkFailed", |
| std::abs(status.error())); |
| } |
| |
| stream_writer_.reset(); // We no longer need the stream. |
| read_buffer_ = nullptr; |
| |
| if (started_) |
| return; |
| |
| // OnResponseCompleted() called without OnResponseStarted(). This should only |
| // happen when the request was aborted. |
| DCHECK_NE(reason, DOWNLOAD_INTERRUPT_REASON_NONE); |
| scoped_ptr<DownloadCreateInfo> create_info = CreateDownloadCreateInfo(reason); |
| scoped_ptr<ByteStreamReader> empty_byte_stream; |
| delegate_->OnStart(std::move(create_info), std::move(empty_byte_stream), |
| base::ResetAndReturn(&on_started_callback_)); |
| } |
| |
| void DownloadRequestCore::PauseRequest() { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| |
| ++pause_count_; |
| } |
| |
| void DownloadRequestCore::ResumeRequest() { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| DCHECK_LT(0, pause_count_); |
| |
| --pause_count_; |
| |
| if (!was_deferred_) |
| return; |
| if (pause_count_ > 0) |
| return; |
| |
| was_deferred_ = false; |
| if (!last_stream_pause_time_.is_null()) { |
| total_pause_time_ += (base::TimeTicks::Now() - last_stream_pause_time_); |
| last_stream_pause_time_ = base::TimeTicks(); |
| } |
| |
| delegate_->OnReadyToRead(); |
| } |
| |
| std::string DownloadRequestCore::DebugString() const { |
| return base::StringPrintf( |
| "{" |
| " this=%p " |
| " url_ = " |
| "\"%s\"" |
| " }", |
| reinterpret_cast<const void*>(this), |
| request() ? request()->url().spec().c_str() : "<NULL request>"); |
| } |
| |
| // static |
| DownloadInterruptReason DownloadRequestCore::HandleRequestStatus( |
| const net::URLRequestStatus& status) { |
| net::Error error_code = net::OK; |
| if (status.status() == net::URLRequestStatus::FAILED || |
| // Note cancels as failures too. |
| status.status() == net::URLRequestStatus::CANCELED) { |
| error_code = static_cast<net::Error>(status.error()); // Normal case. |
| // Make sure that at least the fact of failure comes through. |
| if (error_code == net::OK) |
| error_code = net::ERR_FAILED; |
| } |
| |
| // ERR_CONTENT_LENGTH_MISMATCH and ERR_INCOMPLETE_CHUNKED_ENCODING are |
| // allowed since a number of servers in the wild close the connection too |
| // early by mistake. Other browsers - IE9, Firefox 11.0, and Safari 5.1.4 - |
| // treat downloads as complete in both cases, so we follow their lead. |
| if (error_code == net::ERR_CONTENT_LENGTH_MISMATCH || |
| error_code == net::ERR_INCOMPLETE_CHUNKED_ENCODING) { |
| error_code = net::OK; |
| } |
| DownloadInterruptReason reason = ConvertNetErrorToInterruptReason( |
| error_code, DOWNLOAD_INTERRUPT_FROM_NETWORK); |
| |
| return reason; |
| } |
| |
| // static |
| DownloadInterruptReason DownloadRequestCore::HandleSuccessfulServerResponse( |
| const net::HttpResponseHeaders& http_headers, |
| DownloadSaveInfo* save_info) { |
| switch (http_headers.response_code()) { |
| case -1: // Non-HTTP request. |
| case net::HTTP_OK: |
| case net::HTTP_NON_AUTHORITATIVE_INFORMATION: |
| case net::HTTP_PARTIAL_CONTENT: |
| // Expected successful codes. |
| break; |
| |
| case net::HTTP_CREATED: |
| case net::HTTP_ACCEPTED: |
| // Per RFC 2616 the entity being transferred is metadata about the |
| // resource at the target URL and not the resource at that URL (or the |
| // resource that would be at the URL once processing is completed in the |
| // case of HTTP_ACCEPTED). However, we currently don't have special |
| // handling for these response and they are downloaded the same as a |
| // regular response. |
| break; |
| |
| case net::HTTP_NO_CONTENT: |
| case net::HTTP_RESET_CONTENT: |
| // These two status codes don't have an entity (or rather RFC 2616 |
| // requires that there be no entity). They are treated the same as the |
| // resource not being found since there is no entity to download. |
| |
| case net::HTTP_NOT_FOUND: |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT; |
| break; |
| |
| case net::HTTP_REQUESTED_RANGE_NOT_SATISFIABLE: |
| // Retry by downloading from the start automatically: |
| // If we haven't received data when we get this error, we won't. |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_NO_RANGE; |
| break; |
| case net::HTTP_UNAUTHORIZED: |
| case net::HTTP_PROXY_AUTHENTICATION_REQUIRED: |
| // Server didn't authorize this request. |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_UNAUTHORIZED; |
| break; |
| case net::HTTP_FORBIDDEN: |
| // Server forbids access to this resource. |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_FORBIDDEN; |
| break; |
| default: // All other errors. |
| // Redirection and informational codes should have been handled earlier |
| // in the stack. |
| DCHECK_NE(3, http_headers.response_code() / 100); |
| DCHECK_NE(1, http_headers.response_code() / 100); |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_FAILED; |
| } |
| |
| if (save_info && save_info->offset > 0) { |
| // The caller is expecting a partial response. |
| |
| if (http_headers.response_code() != net::HTTP_PARTIAL_CONTENT) { |
| // Requested a partial range, but received the entire response. |
| save_info->offset = 0; |
| save_info->hash_of_partial_file.clear(); |
| save_info->hash_state.reset(); |
| return DOWNLOAD_INTERRUPT_REASON_NONE; |
| } |
| |
| int64_t first_byte = -1; |
| int64_t last_byte = -1; |
| int64_t length = -1; |
| if (!http_headers.GetContentRange(&first_byte, &last_byte, &length)) |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT; |
| DCHECK_GE(first_byte, 0); |
| |
| if (first_byte != save_info->offset) { |
| // The server returned a different range than the one we requested. Assume |
| // the response is bad. |
| // |
| // In the future we should consider allowing offsets that are less than |
| // the offset we've requested, since in theory we can truncate the partial |
| // file at the offset and continue. |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT; |
| } |
| |
| return DOWNLOAD_INTERRUPT_REASON_NONE; |
| } |
| |
| if (http_headers.response_code() == net::HTTP_PARTIAL_CONTENT) |
| return DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT; |
| |
| return DOWNLOAD_INTERRUPT_REASON_NONE; |
| } |
| |
| } // namespace content |