sems/core/AmSipDialog.h

#ifndef AmSipDialog_h
#define AmSipDialog_h

#include "AmSipRequest.h"
#include "AmSipReply.h"

#include <string>
#include <vector>
#include <map>
using std::string;
using std::vector;
using std::map;

#define CONTACT_USER_PREFIX "sems"

/** \brief SIP transaction representation */
struct AmSipTransaction
{
  string       method;
  unsigned int cseq;

  // last reply code
  // (sent or received)
  //int reply_code;

  AmSipTransaction(const string& method, unsigned int cseq)
    : method(method),
       cseq(cseq)
  {}

  AmSipTransaction()
  {}
};

typedef map<int,AmSipTransaction> TransMap;

/**
 * \brief base class for SIP request/reply event handler 
 */
class AmSipDialogEventHandler 
{
 public:
  virtual void onSendRequest(const string& method,
			     const string& content_type,
			     const string& body,
			     string& hdrs,
			     unsigned int cseq)=0;

  virtual void onSendReply(const AmSipRequest& req,
			   unsigned int  code,
			   const string& reason,
			   const string& content_type,
			   const string& body,
			   string& hdrs)=0;

  virtual ~AmSipDialogEventHandler() {};
};

/**
 * \brief implements the dialog state machine
 */
class AmSipDialog
{
  int status;

  TransMap uas_trans;
  TransMap uac_trans;

  AmSipDialogEventHandler* hdl;
  vector<string> route;        // record routing

  int updateStatusReply(const AmSipRequest& req, 
			unsigned int code);

 public:
  enum Status {
	
    Disconnected=0,
    Pending,
    Connected,
    Disconnecting
  };

  static char* status2str[4];

  string user;         // local user
  string domain;       // local domain
  string sip_ip;       // destination IP of first received message
  string sip_port;     // optional: SIP port

  string local_uri;    // local uri
  string remote_uri;   // remote uri

  string contact_uri;  // pre-calculated contact uri

  string callid;
  string remote_tag;
  string local_tag;

  string remote_party; // To/From
  string local_party;  // To/From

  string getRoute(); // record routing
  void   setRoute(const string& n_route);

  string next_hop;     // next_hop for t_uac_dlg

  int cseq;            // CSeq for next request

  AmSipDialog(AmSipDialogEventHandler* h=0)
    : status(Disconnected),cseq(10),hdl(h)
    {}

  ~AmSipDialog();

  bool   getUACTransPending() { return !uac_trans.empty(); }
  int    getStatus() { return status; }
  string getContactHdr();

  void updateStatus(const AmSipRequest& req);
  void updateStatus(const AmSipReply& reply);
  /** update Status from locally originated request (e.g. INVITE) */
  void updateStatusFromLocalRequest(const AmSipRequest& req);

  int reply(const AmSipRequest& req, // Ser's transaction key
	    unsigned int  code, 
	    const string& reason,
	    const string& content_type = "",
	    const string& body = "",
	    const string& hdrs = "");

  int sendRequest(const string& method, 
		  const string& content_type = "",
		  const string& body = "",
		  const string& hdrs = "");
    
  int bye();
  int cancel();
  int update(const string& hdrs);
  int reinvite(const string& hdrs,  
	       const string& content_type,
	       const string& body);
  int invite(const string& hdrs,  
	     const string& content_type,
	     const string& body);
  int refer(const string& refer_to);
  int transfer(const string& target);
  int drop();

  /**
   * @return true if a transaction could be found that
   *              matches the CANCEL's one.
   */
  bool match_cancel(const AmSipRequest& cancel_req);

  /**
   * @return the method of the corresponding uac request
   */
  string get_uac_trans_method(unsigned int cseq);

  static int reply_error(const AmSipRequest& req,
			 unsigned int  code, 
			 const string& reason,
			 const string& hdrs = "");
};


#endif