/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2011 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#ifndef __SSL_H__
#define __SSL_H__

#include "inspsocket.h"
#include <map>
#include <string>

/** ssl_cert is a class which abstracts SSL certificate
 * and key information.
 *
 * Because gnutls and openssl represent key information in
 * wildly different ways, this class allows it to be accessed
 * in a unified manner. These classes are attached to ssl-
 * connected local users using SSLCertExt
 */
class ssl_cert : public refcountbase
{
 public:
	std::string dn;
	std::string issuer;
	std::string error;
	std::string fingerprint;
	bool trusted, invalid, unknownsigner, revoked;

	ssl_cert() : trusted(false), invalid(true), unknownsigner(true), revoked(false) {}

	/** Get certificate distinguished name
	 * @return Certificate DN
	 */
	const std::string& GetDN()
	{
		return dn;
	}

	/** Get Certificate issuer
	 * @return Certificate issuer
	 */
	const std::string& GetIssuer()
	{
		return issuer;
	}

	/** Get error string if an error has occured
	 * @return The error associated with this users certificate,
	 * or an empty string if there is no error.
	 */
	const std::string& GetError()
	{
		return error;
	}

	/** Get key fingerprint.
	 * @return The key fingerprint as a hex string.
	 */
	const std::string& GetFingerprint()
	{
		return fingerprint;
	}

	/** Get trust status
	 * @return True if this is a trusted certificate
	 * (the certificate chain validates)
	 */
	bool IsTrusted()
	{
		return trusted;
	}

	/** Get validity status
	 * @return True if the certificate itself is
	 * correctly formed.
	 */
	bool IsInvalid()
	{
		return invalid;
	}

	/** Get signer status
	 * @return True if the certificate appears to be
	 * self-signed.
	 */
	bool IsUnknownSigner()
	{
		return unknownsigner;
	}

	/** Get revokation status.
	 * @return True if the certificate is revoked.
	 * Note that this only works properly for GnuTLS
	 * right now.
	 */
	bool IsRevoked()
	{
		return revoked;
	}

	bool IsCAVerified()
	{
		return trusted && !invalid && !revoked && !unknownsigner && error.empty();
	}

	std::string GetMetaLine()
	{
		std::stringstream value;
		bool hasError = error.length();
		value << (IsInvalid() ? "v" : "V") << (IsTrusted() ? "T" : "t") << (IsRevoked() ? "R" : "r")
			<< (IsUnknownSigner() ? "s" : "S") << (hasError ? "E" : "e") << " ";
		if (hasError)
			value << GetError();
		else
			value << GetFingerprint() << " " << GetDN() << " " << GetIssuer();
		return value.str();
	}
};

class SSLIOHook : public IOHook
{
 public:
	SSLIOHook(Module* Creator) : IOHook(Creator) {}
	virtual int OnRead(StreamSocket*, std::string& recvq) = 0;
	virtual int OnWrite(StreamSocket*, std::string& sendq) = 0;
	virtual void OnClose(StreamSocket*) = 0;
	virtual ssl_cert* GetCertificate() = 0;
};

/** Get SSL certificates from users.
 * Access via dynamic_reference<UserCertificateProvider>("sslinfo")
 */
class UserCertificateProvider : public DataProvider
{
 public:
	UserCertificateProvider(Module* mod, const std::string& Name) : DataProvider(mod, Name) {}
	virtual ssl_cert* GetCert(User* u) = 0;
	virtual std::string GetFingerprint(User* u) = 0;
};

#endif