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content / browser / renderer_host / data_transfer_util.cc [blame]
// Copyright 2020 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/browser/renderer_host/data_transfer_util.h"
#include <string>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/containers/span.h"
#include "base/files/file_path.h"
#include "base/strings/utf_string_conversions.h"
#include "base/uuid.h"
#include "build/chromeos_buildflags.h"
#include "content/browser/blob_storage/chrome_blob_storage_context.h"
#include "content/browser/file_system_access/file_system_access_manager_impl.h"
#include "content/public/browser/browser_thread.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "net/base/mime_util.h"
#include "services/network/public/mojom/referrer_policy.mojom-shared.h"
#include "storage/browser/blob/blob_storage_context.h"
#include "storage/browser/file_system/external_mount_points.h"
#include "storage/browser/file_system/file_system_context.h"
#include "third_party/blink/public/mojom/blob/serialized_blob.mojom.h"
#include "third_party/blink/public/mojom/drag/drag.mojom.h"
#include "third_party/blink/public/mojom/file_system_access/file_system_access_data_transfer_token.mojom.h"
#include "ui/base/clipboard/clipboard_constants.h"
#include "ui/base/clipboard/file_info.h"
#include "url/gurl.h"
namespace content {
namespace {
// On Chrome OS paths that exist on an external mount point need to be treated
// differently to make sure the File System Access code accesses these paths via
// the correct file system backend. This method checks if this is the case, and
// updates `entry_path` to the path that should be used by the File System
// Access implementation.
content::PathType MaybeRemapPath(base::FilePath* entry_path) {
#if BUILDFLAG(IS_CHROMEOS_ASH)
base::FilePath virtual_path;
auto* external_mount_points =
storage::ExternalMountPoints::GetSystemInstance();
if (external_mount_points->GetVirtualPath(*entry_path, &virtual_path)) {
*entry_path = std::move(virtual_path);
return content::PathType::kExternal;
}
#endif
return content::PathType::kLocal;
}
} // namespace
std::vector<blink::mojom::DataTransferFilePtr> FileInfosToDataTransferFiles(
const std::vector<ui::FileInfo>& filenames,
FileSystemAccessManagerImpl* file_system_access_manager,
int child_id) {
std::vector<blink::mojom::DataTransferFilePtr> result;
for (const ui::FileInfo& file_info : filenames) {
blink::mojom::DataTransferFilePtr file =
blink::mojom::DataTransferFile::New();
file->path = file_info.path;
file->display_name = file_info.display_name;
mojo::PendingRemote<blink::mojom::FileSystemAccessDataTransferToken>
pending_token;
base::FilePath entry_path = file_info.path;
content::PathType path_type = MaybeRemapPath(&entry_path);
base::FilePath display_name = !file_info.display_name.empty()
? file_info.display_name
: entry_path.BaseName();
file_system_access_manager->CreateFileSystemAccessDataTransferToken(
content::PathInfo(path_type, entry_path, display_name.AsUTF8Unsafe()),
child_id, pending_token.InitWithNewPipeAndPassReceiver());
file->file_system_access_token = std::move(pending_token);
result.push_back(std::move(file));
}
return result;
}
std::vector<blink::mojom::DragItemFileSystemFilePtr>
FileSystemFileInfosToDragItemFileSystemFilePtr(
std::vector<DropData::FileSystemFileInfo> file_system_file_infos,
FileSystemAccessManagerImpl* file_system_access_manager,
scoped_refptr<content::ChromeBlobStorageContext> context) {
std::vector<blink::mojom::DragItemFileSystemFilePtr> result;
for (const content::DropData::FileSystemFileInfo& file_system_file :
file_system_file_infos) {
blink::mojom::DragItemFileSystemFilePtr item =
blink::mojom::DragItemFileSystemFile::New();
item->url = file_system_file.url;
item->size = file_system_file.size;
item->file_system_id = file_system_file.filesystem_id;
storage::FileSystemURL file_system_url =
file_system_access_manager->context()->CrackURLInFirstPartyContext(
file_system_file.url);
DCHECK(file_system_url.type() != storage::kFileSystemTypePersistent);
DCHECK(file_system_url.type() != storage::kFileSystemTypeTemporary);
std::string uuid = base::Uuid::GenerateRandomV4().AsLowercaseString();
std::string content_type;
base::FilePath::StringType extension = file_system_url.path().Extension();
if (!extension.empty()) {
std::string mime_type;
// TODO(crbug.com/40291155): Historically for blobs created from
// file system URLs we've only considered well known content types to
// avoid leaking the presence of locally installed applications when
// creating blobs from files in the sandboxed file system. However, since
// this code path should only deal with real/"trusted" paths, we could
// consider taking platform defined mime type mappings into account here
// as well. Note that the approach used here must not block or else it
// can't be called from the UI thread (for example, calls to
// GetMimeTypeFromExtension can block).
if (net::GetWellKnownMimeTypeFromExtension(extension.substr(1),
&mime_type))
content_type = std::move(mime_type);
}
// TODO(crbug.com/41458368): Consider some kind of fallback type when
// the above mime type detection fails.
mojo::PendingRemote<blink::mojom::Blob> blob_remote;
mojo::PendingReceiver<blink::mojom::Blob> blob_receiver =
blob_remote.InitWithNewPipeAndPassReceiver();
item->serialized_blob = blink::mojom::SerializedBlob::New(
uuid, content_type, item->size, std::move(blob_remote));
GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(
&ChromeBlobStorageContext::CreateFileSystemBlob, context,
base::WrapRefCounted(file_system_access_manager->context()),
std::move(blob_receiver), std::move(file_system_url),
std::move(uuid), std::move(content_type), item->size,
base::Time()));
result.push_back(std::move(item));
}
return result;
}
blink::mojom::DragDataPtr DropDataToDragData(
const DropData& drop_data,
FileSystemAccessManagerImpl* file_system_access_manager,
int child_id,
scoped_refptr<ChromeBlobStorageContext> chrome_blob_storage_context) {
// These fields are currently unused when dragging into Blink.
DCHECK(drop_data.download_metadata.empty());
DCHECK(drop_data.file_contents_content_disposition.empty());
std::vector<blink::mojom::DragItemPtr> items;
if (drop_data.text) {
blink::mojom::DragItemStringPtr item = blink::mojom::DragItemString::New();
item->string_type = ui::kMimeTypeText;
item->string_data = *drop_data.text;
items.push_back(blink::mojom::DragItem::NewString(std::move(item)));
}
if (!drop_data.url.is_empty()) {
blink::mojom::DragItemStringPtr item = blink::mojom::DragItemString::New();
item->string_type = ui::kMimeTypeURIList;
item->string_data = base::UTF8ToUTF16(drop_data.url.spec());
item->title = drop_data.url_title;
items.push_back(blink::mojom::DragItem::NewString(std::move(item)));
}
if (drop_data.html) {
blink::mojom::DragItemStringPtr item = blink::mojom::DragItemString::New();
item->string_type = ui::kMimeTypeHTML;
item->string_data = *drop_data.html;
item->base_url = drop_data.html_base_url;
items.push_back(blink::mojom::DragItem::NewString(std::move(item)));
}
std::vector<blink::mojom::DataTransferFilePtr> files =
FileInfosToDataTransferFiles(drop_data.filenames,
file_system_access_manager, child_id);
for (auto& file : files) {
items.push_back(blink::mojom::DragItem::NewFile(std::move(file)));
}
std::vector<blink::mojom::DragItemFileSystemFilePtr> file_system_files =
FileSystemFileInfosToDragItemFileSystemFilePtr(
drop_data.file_system_files, file_system_access_manager,
std::move(chrome_blob_storage_context));
for (auto& file_system_file : file_system_files) {
items.push_back(
blink::mojom::DragItem::NewFileSystemFile(std::move(file_system_file)));
}
if (drop_data.file_contents_source_url.is_valid()) {
blink::mojom::DragItemBinaryPtr item = blink::mojom::DragItemBinary::New();
item->data = mojo_base::BigBuffer(
base::as_bytes(base::make_span(drop_data.file_contents)));
item->is_image_accessible = drop_data.file_contents_image_accessible;
item->source_url = drop_data.file_contents_source_url;
item->filename_extension =
base::FilePath(drop_data.file_contents_filename_extension);
items.push_back(blink::mojom::DragItem::NewBinary(std::move(item)));
}
for (const std::pair<const std::u16string, std::u16string>& data :
drop_data.custom_data) {
blink::mojom::DragItemStringPtr item = blink::mojom::DragItemString::New();
item->string_type = base::UTF16ToUTF8(data.first);
item->string_data = data.second;
items.push_back(blink::mojom::DragItem::NewString(std::move(item)));
}
return blink::mojom::DragData::New(
std::move(items),
// While this shouldn't be a problem in production code, as the
// real file_system_id should never be empty if used in browser to
// renderer messages, some tests use this function to test renderer to
// browser messages, in which case the field is unused and this will hit
// a DCHECK.
drop_data.filesystem_id.empty()
? std::nullopt
: std::optional<std::string>(
base::UTF16ToUTF8(drop_data.filesystem_id)),
/*force_default_action=*/!drop_data.document_is_handling_drag,
drop_data.referrer_policy);
}
blink::mojom::DragDataPtr DropMetaDataToDragData(
const std::vector<DropData::Metadata>& drop_meta_data) {
std::vector<blink::mojom::DragItemPtr> items;
for (const auto& meta_data_item : drop_meta_data) {
if (meta_data_item.kind == DropData::Kind::STRING) {
blink::mojom::DragItemStringPtr item =
blink::mojom::DragItemString::New();
item->string_type = base::UTF16ToUTF8(meta_data_item.mime_type);
// Have to pass a dummy URL here instead of an empty URL because the
// DropData received by browser_plugins goes through a round trip:
// DropData::MetaData --> WebDragData-->DropData. In the end, DropData
// will contain an empty URL (which means no URL is dragged) if the URL in
// WebDragData is empty.
if (base::EqualsASCII(meta_data_item.mime_type, ui::kMimeTypeURIList)) {
item->string_data = u"about:dragdrop-placeholder";
}
items.push_back(blink::mojom::DragItem::NewString(std::move(item)));
continue;
}
// TODO(hush): crbug.com/584789. Blink needs to support creating a file with
// just the mimetype. This is needed to drag files to WebView on Android
// platform.
if ((meta_data_item.kind == DropData::Kind::FILENAME) &&
!meta_data_item.filename.empty()) {
blink::mojom::DataTransferFilePtr item =
blink::mojom::DataTransferFile::New();
item->path = meta_data_item.filename;
items.push_back(blink::mojom::DragItem::NewFile(std::move(item)));
continue;
}
if (meta_data_item.kind == DropData::Kind::FILESYSTEMFILE) {
blink::mojom::DragItemFileSystemFilePtr item =
blink::mojom::DragItemFileSystemFile::New();
item->url = meta_data_item.file_system_url;
items.push_back(
blink::mojom::DragItem::NewFileSystemFile(std::move(item)));
continue;
}
if (meta_data_item.kind == DropData::Kind::BINARY) {
blink::mojom::DragItemBinaryPtr item =
blink::mojom::DragItemBinary::New();
item->source_url = meta_data_item.file_contents_url;
items.push_back(blink::mojom::DragItem::NewBinary(std::move(item)));
continue;
}
}
return blink::mojom::DragData::New(std::move(items), std::nullopt,
/*force_default_action=*/false,
network::mojom::ReferrerPolicy::kDefault);
}
DropData DragDataToDropData(const blink::mojom::DragData& drag_data) {
// This field should be empty when dragging from the renderer.
DCHECK(!drag_data.file_system_id);
DropData result;
for (const blink::mojom::DragItemPtr& item : drag_data.items) {
switch (item->which()) {
case blink::mojom::DragItemDataView::Tag::kString: {
const blink::mojom::DragItemStringPtr& string_item = item->get_string();
std::string str_type = string_item->string_type;
if (str_type == ui::kMimeTypeText) {
result.text = string_item->string_data;
} else if (str_type == ui::kMimeTypeURIList) {
result.url = GURL(string_item->string_data);
if (string_item->title)
result.url_title = *string_item->title;
} else if (str_type == ui::kMimeTypeDownloadURL) {
result.download_metadata = string_item->string_data;
result.referrer_policy = drag_data.referrer_policy;
} else if (str_type == ui::kMimeTypeHTML) {
result.html = string_item->string_data;
if (string_item->base_url)
result.html_base_url = *string_item->base_url;
} else {
result.custom_data.emplace(
base::UTF8ToUTF16(string_item->string_type),
string_item->string_data);
}
break;
}
case blink::mojom::DragItemDataView::Tag::kBinary: {
DCHECK(result.file_contents.empty());
const blink::mojom::DragItemBinaryPtr& binary_item = item->get_binary();
base::span<const uint8_t> contents = base::make_span(binary_item->data);
result.file_contents.assign(contents.begin(), contents.end());
result.file_contents_image_accessible =
binary_item->is_image_accessible;
result.file_contents_source_url = binary_item->source_url;
result.file_contents_filename_extension =
binary_item->filename_extension.value();
if (binary_item->content_disposition) {
result.file_contents_content_disposition =
*binary_item->content_disposition;
}
break;
}
case blink::mojom::DragItemDataView::Tag::kFile: {
const blink::mojom::DataTransferFilePtr& file_item = item->get_file();
// TODO(varunjain): This only works on chromeos. Support win/mac/gtk.
result.filenames.emplace_back(file_item->path, file_item->display_name);
break;
}
case blink::mojom::DragItemDataView::Tag::kFileSystemFile: {
const blink::mojom::DragItemFileSystemFilePtr& file_system_file_item =
item->get_file_system_file();
// This field should be empty when dragging from the renderer.
DCHECK(!file_system_file_item->file_system_id);
DropData::FileSystemFileInfo info;
info.url = file_system_file_item->url;
info.size = file_system_file_item->size;
info.filesystem_id = std::string();
result.file_system_files.push_back(std::move(info));
break;
}
}
}
return result;
}
} // namespace content