blob: 1a740614e6341aa9b1e2c964a1d71e6a7dece2e1 [file] [log] [blame]
// Copyright 2013 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 "extensions/browser/blob_reader.h"
#include <limits>
#include <utility>
#include "base/format_macros.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
BlobReader::BlobReader(content::BrowserContext* browser_context,
const std::string& blob_uuid,
BlobReadCallback callback)
: callback_(callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
GURL blob_url;
if (base::StartsWith(blob_uuid, "blob:blobinternal",
base::CompareCase::SENSITIVE)) {
// TODO(michaeln): remove support for deprecated blob urls
blob_url = GURL(blob_uuid);
} else {
blob_url = GURL(std::string("blob:uuid/") + blob_uuid);
}
DCHECK(blob_url.is_valid());
net::NetworkTrafficAnnotationTag traffic_annotation =
net::DefineNetworkTrafficAnnotation("blob_reader", R"(
semantics {
sender: "BlobReader"
description:
"Blobs are used for a variety of use cases, and are basically "
"immutable blocks of data. See https://chromium.googlesource.com/"
"chromium/src/+/master/storage/browser/blob/README.md for an "
"explanation of blobs and their implementation in Chrome. These "
"can be created by scripts in a website, web platform features, or "
"internally in the browser."
trigger:
"Request for reading the contents of a blob."
data:
"A reference to a Blob, File, or CacheStorage entry created from "
"script, a web platform feature, or browser internals."
destination: LOCAL
}
policy {
cookies_allowed: NO
setting: "This feature cannot be disabled by settings."
policy_exception_justification:
"Not implemented. This is a local data fetch request and has no "
"network activity."
})");
fetcher_ = net::URLFetcher::Create(blob_url, net::URLFetcher::GET, this,
traffic_annotation);
fetcher_->SetRequestContext(
content::BrowserContext::GetDefaultStoragePartition(browser_context)
->GetURLRequestContext());
}
BlobReader::~BlobReader() { DCHECK_CURRENTLY_ON(content::BrowserThread::UI); }
void BlobReader::SetByteRange(int64_t offset, int64_t length) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
CHECK_GE(offset, 0);
CHECK_GT(length, 0);
CHECK_LE(offset, std::numeric_limits<int64_t>::max() - length);
net::HttpRequestHeaders headers;
headers.SetHeader(
net::HttpRequestHeaders::kRange,
base::StringPrintf("bytes=%" PRId64 "-%" PRId64, offset,
offset + length - 1));
fetcher_->SetExtraRequestHeaders(headers.ToString());
}
void BlobReader::Start() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
fetcher_->Start();
}
// Overridden from net::URLFetcherDelegate.
void BlobReader::OnURLFetchComplete(const net::URLFetcher* source) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
std::unique_ptr<std::string> response(new std::string);
int64_t first = 0, last = 0, length = 0;
source->GetResponseAsString(response.get());
source->GetResponseHeaders()->GetContentRangeFor206(&first, &last, &length);
callback_.Run(std::move(response), length);
delete this;
}