/** BEGIN COPYRIGHT BLOCK
 * Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
 * Copyright (C) 2009 Red Hat, Inc.
 * All rights reserved.
 *
 * License: GPL (version 3 or any later version).
 * See LICENSE for details.
 * END COPYRIGHT BLOCK **/

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

/* teletex.c - Teletex Terminal Identifier syntax routines */

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

static int teletex_filter_ava(Slapi_PBlock *pb, struct berval *bvfilter, Slapi_Value **bvals, int ftype, Slapi_Value **retVal);
static int teletex_filter_sub(Slapi_PBlock *pb, char *initial, char **any, char * final, Slapi_Value **bvals);
static int teletex_values2keys(Slapi_PBlock *pb, Slapi_Value **val, Slapi_Value ***ivals, int ftype);
static int teletex_assertion2keys_ava(Slapi_PBlock *pb, Slapi_Value *val, Slapi_Value ***ivals, int ftype);
static int teletex_assertion2keys_sub(Slapi_PBlock *pb, char *initial, char **any, char * final, Slapi_Value ***ivals);
static int teletex_compare(struct berval *v1, struct berval *v2);
static int teletex_validate(struct berval *val);
static int ttx_param_validate(const char *start, const char *end);
static void teletex_normalize(
    Slapi_PBlock *pb,
    char *s,
    int trim_spaces,
    char **alt);

/* the first name is the official one from RFC 4517 */
static char *names[] = {"Teletex Terminal Identifier", "teletextermid", TELETEXTERMID_SYNTAX_OID, 0};

static Slapi_PluginDesc pdesc = {"teletextermid-syntax", VENDOR, DS_PACKAGE_VERSION,
                                 "Teletex Terminal Identifier attribute syntax plugin"};

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

    slapi_log_err(SLAPI_LOG_PLUGIN, SYNTAX_PLUGIN_SUBSYSTEM, "=> teletex_init\n");

    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 *)teletex_filter_ava);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_FILTER_SUB,
                           (void *)teletex_filter_sub);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_VALUES2KEYS,
                           (void *)teletex_values2keys);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_ASSERTION2KEYS_AVA,
                           (void *)teletex_assertion2keys_ava);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_ASSERTION2KEYS_SUB,
                           (void *)teletex_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 *)TELETEXTERMID_SYNTAX_OID);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_COMPARE,
                           (void *)teletex_compare);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_VALIDATE,
                           (void *)teletex_validate);
    rc |= slapi_pblock_set(pb, SLAPI_PLUGIN_SYNTAX_NORMALIZE,
                           (void *)teletex_normalize);

    slapi_log_err(SLAPI_LOG_PLUGIN, SYNTAX_PLUGIN_SUBSYSTEM, "<= teletex_init %d\n", rc);
    return (rc);
}

static int
teletex_filter_ava(
    Slapi_PBlock *pb,
    struct berval *bvfilter,
    Slapi_Value **bvals,
    int ftype,
    Slapi_Value **retVal)
{
    int filter_normalized = 0;
    int syntax = SYNTAX_CIS;
    if (pb) {
        slapi_pblock_get(pb, SLAPI_PLUGIN_SYNTAX_FILTER_NORMALIZED,
                         &filter_normalized);
        if (filter_normalized) {
            syntax |= SYNTAX_NORM_FILT;
        }
    }
    return (string_filter_ava(bvfilter, bvals, syntax,
                              ftype, retVal));
}


static int
teletex_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
teletex_values2keys(
    Slapi_PBlock *pb,
    Slapi_Value **vals,
    Slapi_Value ***ivals,
    int ftype)
{
    return (string_values2keys(pb, vals, ivals, SYNTAX_CIS,
                               ftype));
}

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

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

    /* Per RFC4517:
     *
     * teletex-id = ttx-term *(DOLLAR ttx-param)
     * ttx-term   = PrintableString
     * ttx-param  = ttx-key COLON ttx-value
     * tty-key    = "graphic" / "control" / "misc" / "page" / "private"
     * ttx-value  = *ttx-value-octet
     *
     * ttx-value-octet = %x00-23
     *                   / (%x5C "24")  ; escaped "$"
     *                   / %x25-5B
     *                   / (%x5C "5C")  ; escaped "\"
     *                   / %x5D-FF
     */

    /* 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 a DOLLAR separator. */
    for (p = start; p <= end; p++) {
        if (IS_DOLLAR(*p)) {
            /* Ensure we don't have an empty element. */
            if ((p == start) || (p == end)) {
                rc = 1;
                goto exit;
            }

            if (!got_ttx_term) {
                /* Validate the ttx-term. */
                while (start < p) {
                    if (!IS_PRINTABLE(*start)) {
                        rc = 1;
                        goto exit;
                    }
                    start++;
                }

                got_ttx_term = 1;
            } else {
                /* Validate the ttx-param. */
                if ((rc = ttx_param_validate(start, p - 1)) != 0) {
                    rc = 1;
                    goto exit;
                }
            }

            /* Reset start to point at the
             * next ttx-param.  We're
             * guaranteed to have at least
             * one more char after p. */
            start = p + 1;
        }
    }

    /* If we didn't find the ttx-term, validate
     * the whole value as the ttx-term. */
    if (!got_ttx_term) {
        for (p = start; p <= end; p++) {
            if (!IS_PRINTABLE(*p)) {
                rc = 1;
                goto exit;
            }
        }
    } else {
        /* Validate the final ttx-param. */
        rc = ttx_param_validate(start, end);
    }

exit:
    return rc;
}

static int
ttx_param_validate(
    const char *start,
    const char *end)
{
    int rc = 0;
    const char *p = NULL;
    int found_colon = 0;

    for (p = start; p <= end; p++) {
        if (IS_COLON(*p)) {
            found_colon = 1;

            /* Validate the ttx-key before the COLON. */
            switch (p - start) {
            case 4:
                /* "misc" / "page" */
                if ((strncmp(start, "misc", 4) != 0) &&
                    (strncmp(start, "page", 4) != 0)) {
                    rc = 1;
                    goto exit;
                }
                break;
            case 7:
                /* "graphic" / "control" / "private" */
                if ((strncmp(start, "graphic", 7) != 0) &&
                    (strncmp(start, "control", 7) != 0) &&
                    (strncmp(start, "private", 7) != 0)) {
                    rc = 1;
                    goto exit;
                }
                break;
            default:
                rc = 1;
                goto exit;
            }

            /* Validate the ttx-value after the COLON.
             * It is allowed to be 0 length. */
            if (p != end) {
                for (++p; p <= end; p++) {
                    /* Ensure that '\' is only used
                     * to escape a '$' or a '\'. */
                    if (*p == '\\') {
                        p++;
                        /* Ensure that we're not at the end of the value */
                        if ((p > end) || ((strncmp(p, "24", 2) != 0) && (strncasecmp(p, "5C", 2) != 0))) {
                            rc = 1;
                            goto exit;
                        } else {
                            /* advance the pointer to point to the end
                             * of the hex code for the escaped character */
                            p++;
                        }
                    } else if (*p == '$') {
                        /* This should be escaped.  Fail. */
                        rc = 1;
                        goto exit;
                    }
                }
            }

            /* We're done. */
            break;
        }
    }

    /* If we didn't find a COLON, fail. */
    if (!found_colon) {
        rc = 1;
    }

exit:
    return rc;
}

static void
teletex_normalize(
    Slapi_PBlock *pb __attribute__((unused)),
    char *s,
    int trim_spaces,
    char **alt)
{
    value_normalize_ext(s, SYNTAX_CIS, trim_spaces, alt);
    return;
}