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/*
* Copyright 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef PC_WEBRTC_SESSION_DESCRIPTION_FACTORY_H_
#define PC_WEBRTC_SESSION_DESCRIPTION_FACTORY_H_
#include <stdint.h>
#include <functional>
#include <memory>
#include <queue>
#include <string>
#include "absl/functional/any_invocable.h"
#include "api/jsep.h"
#include "api/peer_connection_interface.h"
#include "api/scoped_refptr.h"
#include "api/task_queue/task_queue_base.h"
#include "p2p/base/transport_description.h"
#include "p2p/base/transport_description_factory.h"
#include "pc/media_session.h"
#include "pc/sdp_state_provider.h"
#include "rtc_base/rtc_certificate.h"
#include "rtc_base/rtc_certificate_generator.h"
#include "rtc_base/unique_id_generator.h"
#include "rtc_base/weak_ptr.h"
namespace webrtc {
// This class is used to create offer/answer session description. Certificates
// for WebRtcSession/DTLS are either supplied at construction or generated
// asynchronously. It queues the create offer/answer request until the
// certificate generation has completed, i.e. when OnCertificateRequestFailed or
// OnCertificateReady is called.
class WebRtcSessionDescriptionFactory {
public:
// Can specify either a `cert_generator` or `certificate` to enable DTLS. If
// a certificate generator is given, starts generating the certificate
// asynchronously. If a certificate is given, will use that for identifying
// over DTLS. If neither is specified, DTLS is disabled.
WebRtcSessionDescriptionFactory(
ConnectionContext* context,
const SdpStateProvider* sdp_info,
const std::string& session_id,
bool dtls_enabled,
std::unique_ptr<rtc::RTCCertificateGeneratorInterface> cert_generator,
rtc::scoped_refptr<rtc::RTCCertificate> certificate,
std::function<void(const rtc::scoped_refptr<rtc::RTCCertificate>&)>
on_certificate_ready,
const FieldTrialsView& field_trials);
~WebRtcSessionDescriptionFactory();
WebRtcSessionDescriptionFactory(const WebRtcSessionDescriptionFactory&) =
delete;
WebRtcSessionDescriptionFactory& operator=(
const WebRtcSessionDescriptionFactory&) = delete;
static void CopyCandidatesFromSessionDescription(
const SessionDescriptionInterface* source_desc,
const std::string& content_name,
SessionDescriptionInterface* dest_desc);
void CreateOffer(
CreateSessionDescriptionObserver* observer,
const PeerConnectionInterface::RTCOfferAnswerOptions& options,
const cricket::MediaSessionOptions& session_options);
void CreateAnswer(CreateSessionDescriptionObserver* observer,
const cricket::MediaSessionOptions& session_options);
void set_enable_encrypted_rtp_header_extensions(bool enable) {
session_desc_factory_.set_enable_encrypted_rtp_header_extensions(enable);
}
void set_is_unified_plan(bool is_unified_plan) {
session_desc_factory_.set_is_unified_plan(is_unified_plan);
}
// For testing.
bool waiting_for_certificate_for_testing() const {
return certificate_request_state_ == CERTIFICATE_WAITING;
}
void SetInsecureForTesting() {
transport_desc_factory_.SetInsecureForTesting();
}
private:
enum CertificateRequestState {
CERTIFICATE_NOT_NEEDED,
CERTIFICATE_WAITING,
CERTIFICATE_SUCCEEDED,
CERTIFICATE_FAILED,
};
struct CreateSessionDescriptionRequest {
enum Type {
kOffer,
kAnswer,
};
CreateSessionDescriptionRequest(Type type,
CreateSessionDescriptionObserver* observer,
const cricket::MediaSessionOptions& options)
: type(type), observer(observer), options(options) {}
Type type;
rtc::scoped_refptr<CreateSessionDescriptionObserver> observer;
cricket::MediaSessionOptions options;
};
void InternalCreateOffer(CreateSessionDescriptionRequest request);
void InternalCreateAnswer(CreateSessionDescriptionRequest request);
// Posts failure notifications for all pending session description requests.
void FailPendingRequests(const std::string& reason);
void PostCreateSessionDescriptionFailed(
CreateSessionDescriptionObserver* observer,
RTCError error);
void PostCreateSessionDescriptionSucceeded(
CreateSessionDescriptionObserver* observer,
std::unique_ptr<SessionDescriptionInterface> description);
// Posts `callback` to `signaling_thread_`, and ensures it will be called no
// later than in the destructor.
void Post(absl::AnyInvocable<void() &&> callback);
void OnCertificateRequestFailed();
void SetCertificate(rtc::scoped_refptr<rtc::RTCCertificate> certificate);
std::queue<CreateSessionDescriptionRequest>
create_session_description_requests_;
TaskQueueBase* const signaling_thread_;
cricket::TransportDescriptionFactory transport_desc_factory_;
cricket::MediaSessionDescriptionFactory session_desc_factory_;
uint64_t session_version_;
const std::unique_ptr<rtc::RTCCertificateGeneratorInterface> cert_generator_;
const SdpStateProvider* sdp_info_;
const std::string session_id_;
CertificateRequestState certificate_request_state_;
std::queue<absl::AnyInvocable<void() &&>> callbacks_;
std::function<void(const rtc::scoped_refptr<rtc::RTCCertificate>&)>
on_certificate_ready_;
rtc::WeakPtrFactory<WebRtcSessionDescriptionFactory> weak_factory_{this};
};
} // namespace webrtc
#endif // PC_WEBRTC_SESSION_DESCRIPTION_FACTORY_H_
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