#ifndef SRS2_H
#define SRS2_H
#include <stdint.h>
#include <time.h>

/* Adjusted to s/qmail (feh) */

/* Copyright (c) 2004 Shevek (srs@anarres.org)
 * All rights reserved.
 *
 * This file is a part of libsrs2 from http://www.libsrs2.org/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, under the terms of either the GNU General Public
 * License version 2 or the BSD license, at the discretion of the
 * user. Copies of these licenses have been included in the libsrs2
 * distribution. See the the file called LICENSE for more
 * information.
 */

/* This is ugly, but reasonably safe. */
#undef TRUE
#define TRUE 1
#undef FALSE
#define FALSE 0

#define SRSSEP  '='
#define SRS0TAG "SRS0"
#define SRS1TAG "SRS1"

/* Error codes */

#define SRS_ERRTYPE_MASK   0xf000
#define SRS_ERRTYPE_NONE   0x0000
#define SRS_ERRTYPE_CONFIG 0x1000
#define SRS_ERRTYPE_INPUT  0x2000
#define SRS_ERRTYPE_SYNTAX 0x4000
#define SRS_ERRTYPE_SRS    0x8000

#define SRS_SUCCESS        (0)
#define SRS_ENOTSRSADDRESS (1)
#define SRS_ENOTREWRITTEN  (2)

#define SRS_ENOSECRETS        (SRS_ERRTYPE_CONFIG | 1)
#define SRS_ESEPARATORINVALID (SRS_ERRTYPE_CONFIG | 2)

#define SRS_ENOSENDERATSIGN (SRS_ERRTYPE_INPUT | 1)
#define SRS_EBUFTOOSMALL    (SRS_ERRTYPE_INPUT | 2)

#define SRS_ENOSRS0HOST       (SRS_ERRTYPE_SYNTAX | 1)
#define SRS_ENOSRS0USER       (SRS_ERRTYPE_SYNTAX | 2)
#define SRS_ENOSRS0HASH       (SRS_ERRTYPE_SYNTAX | 3)
#define SRS_ENOSRS0STAMP      (SRS_ERRTYPE_SYNTAX | 4)
#define SRS_ENOSRS1HOST       (SRS_ERRTYPE_SYNTAX | 5)
#define SRS_ENOSRS1USER       (SRS_ERRTYPE_SYNTAX | 6)
#define SRS_ENOSRS1HASH       (SRS_ERRTYPE_SYNTAX | 7)
#define SRS_EBADTIMESTAMPCHAR (SRS_ERRTYPE_SYNTAX | 8)
#define SRS_EHASHTOOSHORT     (SRS_ERRTYPE_SYNTAX | 9)

#define SRS_ETIMESTAMPOUTOFDATE (SRS_ERRTYPE_SRS | 1)
#define SRS_EHASHINVALID        (SRS_ERRTYPE_SRS | 2)

#define SRS_ERROR_TYPE(x) ((x) & SRS_ERRTYPE_MASK)

/* SRS implementation */

#define SRS_IS_SRS_ADDRESS(x)                                          \
  ((strncasecmp((x), "SRS", 3) == 0) && (strchr("01", (x)[3]) != NULL) \
   && (strchr("-+=", (x)[4]) != NULL))

typedef void *(*srs_malloc_t)(size_t);
typedef void *(*srs_realloc_t)(void *, size_t);
typedef void (*srs_free_t)(void *);

typedef int srs_bool;

typedef struct _srs_t {
  /* Rewriting parameters */
  //  stralloc cookies;
  char **secrets;
  int numsecrets;
  char separator;

  /* Security parameters */
  int maxage; /* Maximum allowed age in seconds */
  int hashlen;
  int hashmin;

  /* Behaviour parameters */
  srs_bool alwaysrewrite; /* Rewrite even into same domain? */
  srs_bool noforward;     /* Never perform forwards rewriting */
  srs_bool noreverse;     /* Never perform reverse rewriting */
  char **neverrewrite;    /* A list of non-rewritten domains */
} srs_t;

/* Interface */
int srs_set_malloc(srs_malloc_t m, srs_realloc_t r, srs_free_t f);
srs_t *srs_new(void);
void srs_init(srs_t *);
void srs_free(srs_t *);
int srs_forward(srs_t *, char *, int, const char *, const char *);
int srs_forward_alloc(srs_t *, char **, const char *, const char *);
int srs_reverse(srs_t *, char *, int, const char *);
int srs_reverse_alloc(srs_t *, char **, const char *);
const char *srs_strerror(int);
int srs_add_secret(srs_t *, const char *);
const char *srs_get_secret(srs_t *, int);
/* You probably shouldn't call these. */
int srs_timestamp_create(srs_t *, char *, time_t);
int srs_timestamp_check(srs_t *, const char *);

#define SRS_PARAM_DECLARE(n, t)         \
  int srs_set_##n(srs_t *srs, t value); \
  t srs_get_##n(srs_t *srs);

SRS_PARAM_DECLARE(alwaysrewrite, srs_bool)
SRS_PARAM_DECLARE(separator, char)
SRS_PARAM_DECLARE(maxage, int)
SRS_PARAM_DECLARE(hashlen, int)
SRS_PARAM_DECLARE(hashmin, int)
SRS_PARAM_DECLARE(noforward, srs_bool)
SRS_PARAM_DECLARE(noreverse, srs_bool)

#endif /* SRS2_H */