/** 
 * @file llplugincookiestore.h
 * @brief LLPluginCookieStore provides central storage for http cookies used by plugins
 *
 * @cond
 * $LicenseInfo:firstyear=2010&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 * @endcond
 */

#ifndef LL_LLPLUGINCOOKIESTORE_H
#define LL_LLPLUGINCOOKIESTORE_H

#include "lldate.h"
#include <map>
#include <string>
#include <iostream>

class LLPluginCookieStore
{
	LOG_CLASS(LLPluginCookieStore);
public:
	LLPluginCookieStore();
	~LLPluginCookieStore();

	// gets all cookies currently in storage -- use when initializing a plugin
	std::string getAllCookies();
	void writeAllCookies(std::ostream& s);
	
	// gets only persistent cookies (i.e. not session cookies) -- use when writing cookies to a file
	std::string getPersistentCookies();
	void writePersistentCookies(std::ostream& s);
	
	// gets cookies which are marked as "changed" -- use when sending periodic updates to plugins
	std::string getChangedCookies(bool clear_changed = true);
	void writeChangedCookies(std::ostream& s, bool clear_changed = true);
	
	// (re)initializes internal data structures and bulk-sets cookies -- use when reading cookies from a file
	void setAllCookies(const std::string &cookies, bool mark_changed = false);
	void readAllCookies(std::istream& s, bool mark_changed = false);
	
	// sets one or more cookies (without reinitializing anything) -- use when receiving cookies from a plugin
	void setCookies(const std::string &cookies, bool mark_changed = true);
	void readCookies(std::istream& s, bool mark_changed = true);

	// sets one or more cookies (without reinitializing anything), supplying a hostname the cookies came from -- use when setting a cookie manually
	void setCookiesFromHost(const std::string &cookies, const std::string &host, bool mark_changed = true);

	// quote or unquote a string as per the definition of 'quoted-string' in rfc2616
	static std::string quoteString(const std::string &s);
	static std::string unquoteString(const std::string &s);

	void removeCookiesByDomain(const std::string &domain);
	
private:

	void setOneCookie(const std::string &s, std::string::size_type cookie_start, std::string::size_type cookie_end, bool mark_changed, const std::string &host = LLStringUtil::null);

	class Cookie
	{
	public:
		static Cookie *createFromString(const std::string &s, std::string::size_type cookie_start = 0, std::string::size_type cookie_end = std::string::npos, const std::string &host = LLStringUtil::null);
		
		// Construct a string from the cookie that uniquely represents it, to be used as a key in a std::map.
		std::string getKey() const;
		std::string getDomain() const;
		
		const std::string &getCookie() const { return mCookie; };
		bool isSessionCookie() const { return mDate.isNull(); };

		bool isDead() const { return mDead; };
		void setDead(bool dead) { mDead = dead; };
		
		bool isChanged() const { return mChanged; };
		void setChanged(bool changed) { mChanged = changed; };

		const LLDate &getDate() const { return mDate; };
		
	private:
		Cookie(const std::string &s, std::string::size_type cookie_start = 0, std::string::size_type cookie_end = std::string::npos);
		bool parse(const std::string &host);
		std::string::size_type findFieldEnd(std::string::size_type start = 0, std::string::size_type end = std::string::npos);
		bool matchName(std::string::size_type start, std::string::size_type end, const char *name);
		
		std::string mCookie;	// The full cookie, in RFC 2109 string format
		LLDate mDate;			// The expiration date of the cookie.  For session cookies, this will be a null date (mDate.isNull() is true).
		// Start/end indices of various parts of the cookie string.  Stored as indices into the string to save space and time.
		std::string::size_type mNameStart, mNameEnd;
		std::string::size_type mValueStart, mValueEnd;
		std::string::size_type mDomainStart, mDomainEnd;
		std::string::size_type mPathStart, mPathEnd;
		bool mDead;
		bool mChanged;
	};
	
	typedef std::map<std::string, Cookie*> cookie_map_t;
	
	cookie_map_t mCookies;
	bool mHasChangedCookies;
	
	void clearCookies();
	void removeCookie(const std::string &key);
};

#endif // LL_LLPLUGINCOOKIESTORE_H