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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/image_fetcher/core/image_data_fetcher.h"
#include <utility>
#include "base/functional/bind.h"
#include "components/image_fetcher/core/image_fetcher_metrics_reporter.h"
#include "net/base/data_url.h"
#include "net/base/load_flags.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_status_code.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "url/gurl.h"
#include "url/url_constants.h"
namespace {
const char kContentLocationHeader[] = "Content-Location";
const char kNoUmaClient[] = "NoClient";
const int kDownloadTimeoutSeconds = 30;
} // namespace
namespace image_fetcher {
// An active image URL fetcher request. The struct contains the related requests
// state.
struct ImageDataFetcher::ImageDataFetcherRequest {
ImageDataFetcherRequest(ImageDataFetcherCallback callback,
std::unique_ptr<network::SimpleURLLoader> loader)
: callback(std::move(callback)), loader(std::move(loader)) {}
~ImageDataFetcherRequest() = default;
// The callback to run after the image data was fetched. The callback will
// be run even if the image data could not be fetched successfully.
ImageDataFetcherCallback callback;
std::unique_ptr<network::SimpleURLLoader> loader;
};
ImageDataFetcher::ImageDataFetcher(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: url_loader_factory_(url_loader_factory) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
ImageDataFetcher::~ImageDataFetcher() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void ImageDataFetcher::SetImageDownloadLimit(
std::optional<int64_t> max_download_bytes) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
max_download_bytes_ = max_download_bytes;
}
void ImageDataFetcher::FetchImageData(const GURL& image_url,
ImageDataFetcherCallback callback,
ImageFetcherParams params,
bool send_cookies) {
FetchImageData(
image_url, std::move(callback), params, /*referrer=*/std::string(),
net::ReferrerPolicy::CLEAR_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
send_cookies);
}
void ImageDataFetcher::FetchImageData(
const GURL& image_url,
ImageDataFetcherCallback callback,
const net::NetworkTrafficAnnotationTag& traffic_annotation,
bool send_cookies) {
FetchImageData(
image_url, std::move(callback),
ImageFetcherParams(traffic_annotation, kNoUmaClient),
/*referrer=*/std::string(),
net::ReferrerPolicy::CLEAR_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
send_cookies);
}
void ImageDataFetcher::FetchImageData(
const GURL& image_url,
ImageDataFetcherCallback callback,
const std::string& referrer,
net::ReferrerPolicy referrer_policy,
const net::NetworkTrafficAnnotationTag& traffic_annotation,
bool send_cookies) {
FetchImageData(image_url, std::move(callback),
ImageFetcherParams(traffic_annotation, kNoUmaClient), referrer,
referrer_policy, send_cookies);
}
void ImageDataFetcher::FetchImageData(const GURL& image_url,
ImageDataFetcherCallback callback,
ImageFetcherParams params,
const std::string& referrer,
net::ReferrerPolicy referrer_policy,
bool send_cookies) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Handle data urls explicitly since SimpleURLLoader doesn't.
if (image_url.SchemeIs(url::kDataScheme)) {
RequestMetadata metadata;
std::string charset, data;
if (!net::DataURL::Parse(image_url, &metadata.mime_type, &charset, &data)) {
DVLOG(0) << "Failed to parse data url";
}
std::move(callback).Run(std::move(data), metadata);
return;
}
auto request = std::make_unique<network::ResourceRequest>();
request->url = image_url;
request->referrer_policy = referrer_policy;
request->referrer = GURL(referrer);
if (send_cookies) {
request->credentials_mode = network::mojom::CredentialsMode::kInclude;
request->site_for_cookies = net::SiteForCookies::FromUrl(image_url);
} else {
request->credentials_mode = network::mojom::CredentialsMode::kOmit;
}
std::unique_ptr<network::SimpleURLLoader> loader =
network::SimpleURLLoader::Create(std::move(request),
params.traffic_annotation());
// For compatibility in error handling. This is a little wasteful since the
// body will get thrown out anyway, though.
loader->SetAllowHttpErrorResults(true);
loader->SetTimeoutDuration(base::Seconds(kDownloadTimeoutSeconds));
if (max_download_bytes_.has_value()) {
loader->DownloadToString(
url_loader_factory_.get(),
base::BindOnce(&ImageDataFetcher::OnURLLoaderComplete,
base::Unretained(this), loader.get(), std::move(params)),
max_download_bytes_.value());
} else {
loader->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory_.get(),
base::BindOnce(&ImageDataFetcher::OnURLLoaderComplete,
base::Unretained(this), loader.get(),
std::move(params)));
}
std::unique_ptr<ImageDataFetcherRequest> request_track(
new ImageDataFetcherRequest(std::move(callback), std::move(loader)));
network::SimpleURLLoader* loader_raw = request_track->loader.get();
pending_requests_[loader_raw] = std::move(request_track);
}
void ImageDataFetcher::OnURLLoaderComplete(
const network::SimpleURLLoader* source,
ImageFetcherParams params,
std::unique_ptr<std::string> response_body) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pending_requests_.find(source) != pending_requests_.end());
bool success = source->NetError() == net::OK;
int status_code = source->NetError();
RequestMetadata metadata;
if (success && source->ResponseInfo() && source->ResponseInfo()->headers) {
net::HttpResponseHeaders* headers = source->ResponseInfo()->headers.get();
metadata.mime_type = source->ResponseInfo()->mime_type;
metadata.http_response_code = headers->response_code();
// Just read the first value-pair for this header (not caring about `iter`).
headers->EnumerateHeader(
/*iter=*/nullptr, kContentLocationHeader,
&metadata.content_location_header);
success &= (metadata.http_response_code == net::HTTP_OK);
status_code = metadata.http_response_code;
}
std::string image_data;
if (success && response_body) {
image_data = std::move(*response_body);
}
FinishRequest(source, metadata, image_data);
ImageFetcherMetricsReporter::ReportRequestStatusCode(params.uma_client_name(),
status_code);
}
void ImageDataFetcher::FinishRequest(const network::SimpleURLLoader* source,
const RequestMetadata& metadata,
const std::string& image_data) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto request_iter = pending_requests_.find(source);
CHECK(request_iter != pending_requests_.end());
auto callback = std::move(request_iter->second->callback);
pending_requests_.erase(request_iter);
std::move(callback).Run(image_data, metadata);
// `this` might be destroyed now.
}
void ImageDataFetcher::InjectResultForTesting(const RequestMetadata& metadata,
const std::string& image_data) {
DCHECK_EQ(pending_requests_.size(), 1u);
FinishRequest(pending_requests_.begin()->first, metadata, image_data);
}
} // namespace image_fetcher
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