/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008-2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "content.h"
#include "../core/request.h"
#include "../core/error.h"
#include "../core/db.h"
#include "../core/data.h"






bool Content::PrivCheckAccess()
{
	// we do not check permissions here
	// permissions depends on the user, group, and privileges
	// but we cannot use parameter 'r' on files
	// and only logged users can change permissions

	if( !request.session->puser || (request.is_item && request.IsParam("r")) )
	{
		request.status = WINIX_ERR_PERMISSION_DENIED;
		return false;
	}

return true;
}



bool Content::ChangeOwner(Item & item, long user_id, long group_id)
{
	if( user_id!=item.user_id || group_id!=item.group_id )
	{
		if( !request.CanChangeUser(item, user_id) )
		{
			log << log3 << "Content: can't change the user" << logend;
			return false;
		}
		
		if( !request.CanChangeGroup(item, group_id) )
		{
			log << log3 << "Content: can't change the group" << logend;
			return false;
		}
	}

	item.user_id  = user_id;
	item.group_id = group_id;

return true;
}



bool Content::ChangePrivileges(Item & item, int privileges)
{
	if(	privileges != item.privileges )
	{
		if( !request.CanChangePrivileges(item, privileges) )
		{
			log << log3 << "Content: can't change privileges" << logend;
			return false;
		}
	}

	item.privileges = privileges;

return true;
}



void Content::ChangePriv(Item & item, long user_id, long group_id, int privileges)
{
	if( change_owner )
	{
		if( !ChangeOwner(item, user_id, group_id) )
			return;
	}

	if( change_priv )
	{
		if( !ChangePrivileges(item, privileges) )
			return;
	}

	request.status = db.EditPrivById(item, item.id);
}



void Content::PrivLogStart(const char * what, long user, long group, int priv)
{
	log << log2 << what;

	if( change_owner )
	{
		User  * puser  = data.users.GetUser(user);
		Group * pgroup = data.groups.GetGroup(group);

		log << "new user: ";

		if( puser )
			log << puser->name;
		else
			log << "id: " << user;

		log << ", new group: ";

		if( pgroup )
			log << pgroup->name;
		else
			log << "id: " << group;

		if( change_priv )
			log << ", ";
	}

	if( change_priv )
	{
		char buf[30];
		sprintf(buf, "0%o", priv);
		log << "privileges: " << buf;
	}

	log << logend;
}



void Content::PrivLog(const char * what, long id, const std::string & url)
{
Item * root = 0;

	if( id != -1 )
		root = data.dirs.GetRootDir();

	log << log3 << "Content: " << what;

	if( root && root->id == id )
		log << "(root)";
	else
		log << url;

	log << logend;
}


void Content::PrivFilesInDir(long parent_id)
{
	Db::ItemQuery iq;

	iq.SetAll(false, false);
	iq.sel_user_id = iq.sel_group_id = iq.sel_guest_name = iq.sel_privileges = true;

	iq.WhereParentId(parent_id);
	iq.WhereType(Item::file);

	db.GetItems(request.item_table, iq);


	std::vector<Item>::iterator i = request.item_table.begin();

	for( ; i != request.item_table.end() ; ++i)
	{
		PrivLog("changed file: ", -1, i->url);
		ChangePriv(*i, user_id_file, group_id_file, priv_file);
	}
}


// recurrence
void Content::PrivDir(long parent_id)
{
	PrivFilesInDir(parent_id);


	DirContainer::ParentIterator i = data.dirs.FindFirstParent(parent_id);

	for( ; i != data.dirs.ParentEnd() ; i = data.dirs.NextParent(i) )
	{
		PrivLog("changed dir: ", -1, i->second->url);
		ChangePriv(*(i->second), user_id_dir, group_id_dir, priv_dir);

		if( subdirectories )
			PrivDir(i->second->id);
	}
}


bool Content::ReadPriv(const char * user_in, const char * group_in, const char * priv_in,
					   long & user_id, long & group_id, int & priv)
{
	std::string * user_str  = request.PostVar(user_in);
	std::string * group_str = request.PostVar(group_in);
	std::string * priv_str  = request.PostVar(priv_in);

	if( change_owner && (!user_str || !group_str) )
	{
		log << log1 << "Content: PostFunPriv: there is no some post variables for changing the owner" << logend;
		return false;
	}

	if( change_priv && !priv_str )
	{
		log << log1 << "Content: PostFunPriv: there is no some post variables for changing privileges" << logend;
		return false;
	}

	if( change_owner )
	{
		user_id   = data.users.GetUserId( *user_str );
		group_id  = data.groups.GetGroupId( *group_str );
	}

	if( change_priv )
		priv = strtol( priv_str->c_str() , 0, 8);

return true;
}


void Content::PrivDir()
{
	if( !ReadPriv("userfile", "groupfile", "privilegesfile", user_id_file, group_id_file, priv_file) )
		return;

	if( !ReadPriv("userdir", "groupdir", "privilegesdir", user_id_dir, group_id_dir, priv_dir) )
		return;

	PrivLogStart("Content: changes for files: ", user_id_file, group_id_file, priv_file);
	PrivLogStart("Content: changes for dirs:  ", user_id_dir,  group_id_dir,  priv_dir);


	if( request.IsPostVar("changecurrentdir") )
	{
		Item & last_dir = *request.dir_table.back();
		PrivLog("changed dir: ", last_dir.id, last_dir.url);
		ChangePriv(*request.dir_table.back(), user_id_dir, group_id_dir, priv_dir);
	}


	subdirectories = request.IsPostVar("changesubdirs");

	// go through all directories
	PrivDir(request.dir_table.back()->id);

	RedirectToLastDir();
}



// changing only one item (either a dir or file)
void Content::PrivOneItem()
{
	if( !ReadPriv("user", "group", "privileges", user_id_file, group_id_file, priv_file) )
		return;

	PrivLogStart("Content: changes:  ", user_id_file,  group_id_file,  priv_file);

	if( request.is_item )
	{
		ChangePriv(request.item, user_id_file, group_id_file, priv_file);
		RedirectTo(request.item);
	}
	else
	{
		ChangePriv(*request.dir_table.back(), user_id_file, group_id_file, priv_file);
		RedirectToLastDir();
	}
}



void Content::PostFunPriv()
{
	if( !PrivCheckAccess() )
		return;

	change_owner = (request.pfunction->code == FUN_PRIV || request.pfunction->code == FUN_CHOWN);
	change_priv  = (request.pfunction->code == FUN_PRIV || request.pfunction->code == FUN_CHMOD);

	if( request.IsParam("r") )
	{
		PrivDir();
	}
	else
	{
		PrivOneItem();
	}

	data.dirs.CheckRootDir();
}



void Content::FunPriv()
{
	PrivCheckAccess();
}