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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/web_ui_loading_util.h"
#include "base/check.h"
#include "base/debug/crash_logging.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/scoped_refptr.h"
#include "base/types/expected.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/system/data_pipe_producer.h"
#include "net/http/http_byte_range.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_util.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
namespace content {
namespace webui {
namespace {
class MemoryDataSource : public mojo::DataPipeProducer::DataSource {
public:
MemoryDataSource(scoped_refptr<base::RefCountedMemory> data,
size_t offset,
size_t size)
: data_(std::move(data)), offset_(offset), size_(size) {}
uint64_t GetLength() const override { return size_; }
ReadResult Read(uint64_t offset, base::span<char> buffer) override {
ReadResult result;
CHECK_LT(offset, size_);
size_t copy_size =
std::min(buffer.size(), size_ - static_cast<size_t>(offset));
base::as_writable_bytes(buffer).copy_prefix_from(base::span(*data_).subspan(
offset_ + static_cast<size_t>(offset), copy_size));
result.bytes_read = copy_size;
result.result = MOJO_RESULT_OK;
return result;
}
private:
scoped_refptr<base::RefCountedMemory> data_;
size_t offset_;
size_t size_;
};
} // namespace
void CallOnError(
mojo::PendingRemote<network::mojom::URLLoaderClient> client_remote,
int error_code) {
mojo::Remote<network::mojom::URLLoaderClient> client(
std::move(client_remote));
network::URLLoaderCompletionStatus status;
status.error_code = error_code;
client->OnComplete(status);
}
base::expected<net::HttpByteRange, GetRequestedRangeError> GetRequestedRange(
const net::HttpRequestHeaders& headers) {
std::optional<std::string> range_header =
headers.GetHeader(net::HttpRequestHeaders::kRange);
if (!range_header) {
return base::unexpected(GetRequestedRangeError::kNoRanges);
}
std::vector<net::HttpByteRange> ranges;
if (!net::HttpUtil::ParseRangeHeader(*range_header, &ranges)) {
return base::unexpected(GetRequestedRangeError::kParseFailed);
}
if (ranges.size() > 1u) {
return base::unexpected(GetRequestedRangeError::kMultipleRanges);
}
return ranges[0];
}
bool SendData(
network::mojom::URLResponseHeadPtr headers,
mojo::PendingRemote<network::mojom::URLLoaderClient> client_remote,
std::optional<net::HttpByteRange> requested_range,
scoped_refptr<base::RefCountedMemory> bytes) {
// The use of MojoCreateDataPipeOptions below means we'll be using uint32_t
// for sizes / offsets.
if (!base::IsValueInRangeForNumericType<uint32_t>(bytes->size())) {
CallOnError(std::move(client_remote), net::ERR_INSUFFICIENT_RESOURCES);
return false;
}
if (requested_range) {
if (!requested_range->ComputeBounds(bytes->size())) {
CallOnError(std::move(client_remote),
net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
return false;
}
}
auto [pipe, output_size] = GetPipe(bytes, requested_range);
// For media content, |content_length| must be known upfront for data that is
// assumed to be fully buffered (as opposed to streamed from the network),
// otherwise the media player will get confused and refuse to play.
// Content delivered via chrome:// URLs is assumed fully buffered.
headers->content_length = output_size;
mojo::Remote<network::mojom::URLLoaderClient> client(
std::move(client_remote));
client->OnReceiveResponse(std::move(headers), std::move(pipe), std::nullopt);
network::URLLoaderCompletionStatus status(net::OK);
status.encoded_data_length = output_size;
status.encoded_body_length = output_size;
status.decoded_body_length = output_size;
client->OnComplete(status);
return true;
}
std::pair<mojo::ScopedDataPipeConsumerHandle, size_t> GetPipe(
scoped_refptr<base::RefCountedMemory> bytes,
std::optional<net::HttpByteRange> requested_range) {
CHECK(base::IsValueInRangeForNumericType<uint32_t>(bytes->size()));
uint32_t output_offset = 0;
size_t output_size = bytes->size();
if (requested_range) {
DCHECK(base::IsValueInRangeForNumericType<uint32_t>(
requested_range->first_byte_position()))
<< "Expecting ComputeBounds() to enforce it";
output_offset = requested_range->first_byte_position();
output_size = requested_range->last_byte_position() -
requested_range->first_byte_position() + 1;
}
MojoCreateDataPipeOptions options;
options.struct_size = sizeof(MojoCreateDataPipeOptions);
options.flags = MOJO_CREATE_DATA_PIPE_FLAG_NONE;
options.element_num_bytes = 1;
// `0` means using the default capacity.
options.capacity_num_bytes = 0;
mojo::ScopedDataPipeProducerHandle pipe_producer_handle;
mojo::ScopedDataPipeConsumerHandle pipe_consumer_handle;
MojoResult create_result = mojo::CreateDataPipe(
&options, pipe_producer_handle, pipe_consumer_handle);
if (create_result != MOJO_RESULT_OK) {
SCOPED_CRASH_KEY_NUMBER("WebUI", "mojo_CreateDataPipe_result",
create_result);
CHECK(false);
}
auto producer =
std::make_unique<mojo::DataPipeProducer>(std::move(pipe_producer_handle));
auto* producer_ptr = producer.get();
producer_ptr->Write(
std::make_unique<MemoryDataSource>(bytes, output_offset, output_size),
base::DoNothingWithBoundArgs(std::move(producer)));
return std::make_pair(std::move(pipe_consumer_handle), output_size);
}
} // namespace webui
} // namespace content
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