/** BEGIN COPYRIGHT BLOCK
 * This Program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; version 2 of the License.
 * 
 * This Program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
 * Non-GPL Code may instantiate templates or use macros or inline functions from
 * the Approved Interfaces without causing the resulting work to be covered by
 * the GNU General Public License. Only Red Hat, Inc. may make changes or
 * additions to the list of Approved Interfaces. You must obey the GNU General
 * Public License in all respects for all of the Program code and other code used
 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
 * provide this exception without modification, you must delete this exception
 * statement from your version and license this file solely under the GPL without
 * exception. 
 * 
 * 
 * Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
 * Copyright (C) 2009 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

/* telex.c - Telex Number syntax routines */

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "syntax.h"

static int telex_filter_ava( Slapi_PBlock *pb, struct berval *bvfilter,
		Slapi_Value **bvals, int ftype, Slapi_Value **retVal );
static int telex_filter_sub( Slapi_PBlock *pb, char *initial, char **any,
		char *final, Slapi_Value **bvals );
static int telex_values2keys( Slapi_PBlock *pb, Slapi_Value **val,
		Slapi_Value ***ivals, int ftype );
static int telex_assertion2keys_ava( Slapi_PBlock *pb, Slapi_Value *val,
		Slapi_Value ***ivals, int ftype );
static int telex_assertion2keys_sub( Slapi_PBlock *pb, char *initial, char **any,
		char *final, Slapi_Value ***ivals );
static int telex_compare(struct berval	*v1, struct berval	*v2);
static int telex_validate(struct berval *val);

/* the first name is the official one from RFC 4517 */
static char *names[] = { "Telex Number", "telexnumber", TELEXNUMBER_SYNTAX_OID, 0 };

static Slapi_PluginDesc pdesc = { "telex-syntax", VENDOR, DS_PACKAGE_VERSION,
	"Telex Number attribute syntax plugin" };

int
telex_init( Slapi_PBlock *pb )
{
	int	rc, flags;

	LDAPDebug( LDAP_DEBUG_PLUGIN, "=> telex_init\n", 0, 0, 0 );

	rc = slapi_pblock_set( pb, SLAPI_PLUGIN_VERSION,
	    (void *) SLAPI_PLUGIN_VERSION_01 );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_DESCRIPTION,
	    (void *)&pdesc );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_FILTER_AVA,
	    (void *) telex_filter_ava );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_FILTER_SUB,
	    (void *) telex_filter_sub );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_VALUES2KEYS,
	    (void *) telex_values2keys );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_ASSERTION2KEYS_AVA,
	    (void *) telex_assertion2keys_ava );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_ASSERTION2KEYS_SUB,
	    (void *) telex_assertion2keys_sub );
	flags = SLAPI_PLUGIN_SYNTAX_FLAG_ORDERING;
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_FLAGS,
	    (void *) &flags );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_NAMES,
	    (void *) names );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_OID,
	    (void *) TELEXNUMBER_SYNTAX_OID );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_COMPARE,
	    (void *) telex_compare );
	rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_SYNTAX_VALIDATE,
	    (void *) telex_validate );

	LDAPDebug( LDAP_DEBUG_PLUGIN, "<= telex_init %d\n", rc, 0, 0 );
	return( rc );
}

static int
telex_filter_ava(
    Slapi_PBlock		*pb,
    struct berval	*bvfilter,
    Slapi_Value	**bvals,
    int			ftype,
	Slapi_Value **retVal
)
{
	return( string_filter_ava( bvfilter, bvals, SYNTAX_CIS,
	    ftype, retVal ) );
}


static int
telex_filter_sub(
    Slapi_PBlock		*pb,
    char		*initial,
    char		**any,
    char		*final,
    Slapi_Value	**bvals
)
{
	return( string_filter_sub( pb, initial, any, final, bvals, SYNTAX_CIS ) );
}

static int
telex_values2keys(
    Slapi_PBlock		*pb,
    Slapi_Value	**vals,
    Slapi_Value	***ivals,
    int			ftype
)
{
	return( string_values2keys( pb, vals, ivals, SYNTAX_CIS,
	    ftype ) );
}

static int
telex_assertion2keys_ava(
    Slapi_PBlock		*pb,
    Slapi_Value	*val,
    Slapi_Value	***ivals,
    int			ftype
)
{
	return(string_assertion2keys_ava( pb, val, ivals,
	    SYNTAX_CIS, ftype ));
}

static int
telex_assertion2keys_sub(
    Slapi_PBlock		*pb,
    char		*initial,
    char		**any,
    char		*final,
    Slapi_Value	***ivals
)
{
	return( string_assertion2keys_sub( pb, initial, any, final, ivals,
	    SYNTAX_CIS ) );
}

static int telex_compare(    
	struct berval	*v1,
    struct berval	*v2
)
{
	return value_cmp(v1, v2, SYNTAX_CIS, 3 /* Normalise both values */);
}

static int
telex_validate(
	struct berval	*val
)
{
	int rc = 0;    /* assume the value is valid */
	const char *start = NULL;
	const char *end = NULL;
	const char *p = NULL;
	const char *p2 = NULL;
	int num_dollars = 0;

	/* Per RFC4517:
	 *
	 * telex-number  = actual-number DOLLAR country-code
	 *                   DOLLAR answerback
	 * actual-number = PrintableString
	 * country-code  = PrintableString
	 * answerback    = PrintableString
	 */

	/* Don't allow a 0 length string */
	if ((val == NULL) || (val->bv_len == 0)) {
		rc = 1;
		goto exit;
	}

	start = &(val->bv_val[0]);
	end = &(val->bv_val[val->bv_len - 1]);

	/* Look for the DOLLAR separators. */
	for (p = start; p <= end; p++) {
		if (IS_DOLLAR(*p)) {
			num_dollars++;

			/* Ensure we don't have an empty element. */
			if ((p == start) || (p == end)) {
				rc = 1;
				goto exit;
			}

			for (p2 = start; p2 < p; p2++) {
				if (!IS_PRINTABLE(*p2)) {
				        rc = 1;
				        goto exit;
				}
			}

			/* Reset start to the beginning
			 * of the next element.  We're
			 * guaranteed to have another
			 * char after p. */
			start = p + 1;

			if (num_dollars == 2) {
				/* Validate the answerback element
				 * and exit. */
				for (p2 = start; p2 <= end; p2++) {
					if (!IS_PRINTABLE(*p2)) {
						rc = 1;
						goto exit;
					}
				}

				/* We've hit the end and it's
				 * all valid.  We're done. */
				goto exit;
			}
		}
	}

	/* Make sure we found all three elements. */
	if (num_dollars != 2) {
		rc = 1;
		goto exit;
	}

exit:
	return rc;
}