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// 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 "chrome/browser/extensions/blob_reader.h"
#include "base/format_macros.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_thread.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.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(Profile* profile,
const std::string& blob_uuid,
BlobReadCallback callback)
: callback_(callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
GURL blob_url;
if (StartsWithASCII(blob_uuid, "blob:blobinternal", true)) {
// 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());
fetcher_.reset(net::URLFetcher::Create(
blob_url, net::URLFetcher::GET,
this));
fetcher_->SetRequestContext(profile->GetRequestContext());
}
BlobReader::~BlobReader() { DCHECK_CURRENTLY_ON(content::BrowserThread::UI); }
void BlobReader::SetByteRange(int64 offset, int64 length) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
CHECK_GE(offset, 0);
CHECK_GT(length, 0);
CHECK_LE(offset, kint64max - 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);
scoped_ptr<std::string> response(new std::string);
int64 first = 0, last = 0, length = 0;
source->GetResponseAsString(response.get());
source->GetResponseHeaders()->GetContentRange(&first, &last, &length);
callback_.Run(response.Pass(), length);
delete this;
}
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