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// Copyright 2015 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.
#ifndef NET_CERT_CERT_NET_FETCHER_H_
#define NET_CERT_CERT_NET_FETCHER_H_
#include <vector>
#include "base/callback.h"
#include "net/base/net_errors.h"
#include "net/base/net_export.h"
class GURL;
namespace net {
class URLRequestContext;
// CertNetFetcher is an asynchronous interface for fetching AIA URLs and CRL
// URLs.
//
// -------------------------
// Cancellation of requests
// -------------------------
//
// * Network requests started by the CertNetFetcher can be cancelled by
// deleting the Request object. Cancellation means the request's callback
// will no longer be invoked.
//
// * If the CertNetFetcher is deleted then any outstanding
// requests are automatically cancelled.
//
// * Cancelling a request within the execution of a callback is allowed.
//
// * Deleting the CertNetFetcher from within the execution of a callback is
// allowed.
//
// -------------------------
// Threading
// -------------------------
//
// The CertNetFetcher is expected to be operated from a single thread, which has
// an IO message loop. The URLRequestContext will be accessed from this same
// thread, and callbacks will be posted to this message loop.
//
// For more details see the design document:
// https://docs.google.com/a/chromium.org/document/d/1CdS9YOnPdAyVZBJqHY7ZJ6tUlU71OCvX8kHnaVhf144/edit
class NET_EXPORT CertNetFetcher {
public:
class Request {
public:
virtual ~Request() {}
};
// Callback invoked on request completion. If the Error is OK, then the
// vector contains the response bytes.
using FetchCallback =
base::Callback<void(Error, const std::vector<uint8_t>&)>;
// This value can be used in place of timeout or max size limits.
enum { DEFAULT = -1 };
CertNetFetcher() {}
// Deletion implicitly cancels any outstanding requests.
virtual ~CertNetFetcher() {}
// The Fetch*() methods start an asynchronous request which can be cancelled
// by deleting the returned Request. Here is the meaning of the common
// parameters:
//
// * url -- The http:// URL to fetch.
// * timeout_seconds -- The maximum allowed duration for the fetch job. If
// this delay is exceeded then the request will fail. To use a default
// timeout pass DEFAULT.
// * max_response_bytes -- The maximum size of the response body. If this
// size is exceeded then the request will fail. To use a default timeout
// pass DEFAULT.
// * callback -- The callback that will be invoked on completion of the job.
virtual WARN_UNUSED_RESULT scoped_ptr<Request> FetchCaIssuers(
const GURL& url,
int timeout_milliseconds,
int max_response_bytes,
const FetchCallback& callback) = 0;
virtual WARN_UNUSED_RESULT scoped_ptr<Request> FetchCrl(
const GURL& url,
int timeout_milliseconds,
int max_response_bytes,
const FetchCallback& callback) = 0;
virtual WARN_UNUSED_RESULT scoped_ptr<Request> FetchOcsp(
const GURL& url,
int timeout_milliseconds,
int max_response_bytes,
const FetchCallback& callback) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(CertNetFetcher);
};
} // namespace net
#endif // NET_CERT_NET_CERT_NET_FETCHER_H_
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