/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com

  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; either
  version 2.1 of the License, or (at your option) any later version.

  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <osipparser2/internal.h>

#include <osipparser2/osip_port.h>
#include <osipparser2/osip_message.h>
#include <osipparser2/osip_parser.h>
#include "parser.h"

/* adds the from header to message.              */
/* INPUT : char *hvalue | value of header.    */
/* OUTPUT: osip_message_t *sip | structure to save results.  */
/* returns -1 on error. */
int osip_message_set_from(osip_message_t *sip, const char *hvalue) {
  int i;

  if (hvalue == NULL || hvalue[0] == '\0')
    return OSIP_SUCCESS;

  if (sip->from != NULL)
    return OSIP_SYNTAXERROR;

  i = osip_from_init(&(sip->from));

  if (i != 0)
    return i;

  sip->message_property = 2;
  i = osip_from_parse(sip->from, hvalue);

  if (i != 0) {
    osip_from_free(sip->from);
    sip->from = NULL;
    return i;
  }

  return OSIP_SUCCESS;
}

#ifndef MINISIZE
/* returns the from header.            */
/* INPUT : osip_message_t *sip | sip message.   */
/* returns null on error. */
osip_from_t *osip_message_get_from(const osip_message_t *sip) {
  return sip->from;
}
#endif

int osip_from_init(osip_from_t **from) {
  *from = (osip_from_t *) osip_malloc(sizeof(osip_from_t));

  if (*from == NULL)
    return OSIP_NOMEM;

  (*from)->displayname = NULL;
  (*from)->url = NULL;

  osip_list_init(&(*from)->gen_params);

  return OSIP_SUCCESS;
}

/* deallocates a osip_from_t structure.  */
/* INPUT : osip_from_t *from | from. */
void osip_from_free(osip_from_t *from) {
  if (from == NULL)
    return;

  if (from->url != NULL) {
    osip_uri_free(from->url);
  }

  osip_free(from->displayname);

  osip_generic_param_freelist(&from->gen_params);

  osip_free(from);
}

/* parses the string as a from header.                   */
/* INPUT : const char *string | pointer to a from string.*/
/* OUTPUT: osip_from_t *from | structure to save results.     */
/* returns -1 on error. */
int osip_from_parse(osip_from_t *from, const char *hvalue) {
  const char *displayname = NULL;
  const char *url = NULL;
  const char *url_end = NULL;
  const char *gen_params;
  const char *ptr;
  int i;

  if (from == NULL || hvalue == NULL)
    return OSIP_BADPARAMETER;

  /* How to parse:

     we'll place the pointers:
     displayname  =>  beginning of displayname
     url          =>  beginning of url
     url_end      =>  end       of url
     gen_params  =>  beginning of params

     examples:

     jack <sip:amoizard@antisip.com>;tag=34erZ
     ^     ^                ^ ^

     sip:amoizard@antisip.com;tag=34erZ
     ^                ^^
   */
  /* search for first char */
  ptr = hvalue;

  while (ptr[0] != '\0') {
    if (ptr[0] == ' ') {
      ptr++;
      continue;
    }

    if (ptr[0] == '"') {
      displayname = ptr;
      break;
    }

    break;
  }

  if (ptr[0] == '\0')
    return OSIP_SUCCESS; /* empty header allowed? */

  if (displayname != NULL) {
    /* displayname IS A quoted-string (not a '*token') */
    const char *second = NULL;

    /* search for quotes */
    second = __osip_quote_find(displayname + 1);

    if (second == NULL)
      return OSIP_SYNTAXERROR; /* missing quote */

    if (second - displayname + 2 >= 2) {
      from->displayname = (char *) osip_malloc(second - displayname + 2);

      if (from->displayname == NULL)
        return OSIP_NOMEM;

      osip_strncpy(from->displayname, displayname, second - displayname + 1);
      /* osip_clrspace(from->displayname); */ /*should we do that? */

      /* special case: "<sip:joe@big.org>" <sip:joe@really.big.com> */
    } /* else displayname is empty? */

    ptr = second + 1;

    while (ptr[0] != '\0') {
      if (ptr[0] == ' ') {
        ptr++;
        continue;
      }

      if (ptr[0] == '<') {
        url = ptr;
        break;
      }

      break;
    }

    if (url == NULL)
      return OSIP_SYNTAXERROR; /* '<' MUST exist */

    if (ptr[1] == '\0')
      return OSIP_SYNTAXERROR; /* '<' MUST contain something */

  } else {
    /* 1*(alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~" ) */
    /* search for URL -> continue until non allowed element is found */
    const char *beg = ptr;

    while (ptr[0] != '\0') {
      if (ptr[0] == ' ') {
        ptr++;
        continue;
      }

      if (ptr[0] >= 'a' && ptr[0] <= 'z') {
        ptr++;
        continue;
      }

      if (ptr[0] >= 'A' && ptr[0] <= 'Z') {
        ptr++;
        continue;
      }

      if (ptr[0] >= '0' && ptr[0] <= '9') {
        ptr++;
        continue;
      }

      if (ptr[0] == '-' || ptr[0] == '.' || ptr[0] == '!' || ptr[0] == '%' || ptr[0] == '*' || ptr[0] == '_' || ptr[0] == '+' || ptr[0] == '`' || ptr[0] == '\'' || ptr[0] == '~') {
        ptr++;
        continue;
      }

      url = ptr;
      break;
    }

    if (ptr[0] == '\0' || url == NULL)
      return OSIP_SYNTAXERROR; /* not special char found? broken header? */

    if (ptr[0] == '<') {
      /* "<" found for URI */
      if (ptr[1] == '\0')
        return OSIP_SYNTAXERROR; /* '<' MUST contain something */

      if (url - beg > 0) {
        from->displayname = (char *) osip_malloc(url - beg + 1);

        if (from->displayname == NULL)
          return OSIP_NOMEM;

        osip_clrncpy(from->displayname, hvalue, url - beg);
      }

    } else if (ptr[0] == ':') {
      /* this was a scheme for a URL? */
      url = beg;

    } else {
      /* this is some non URL header? */
      url = beg;
    }
  }

  /* define url_end and gen_params for name-addr */
  if (url[0] == '<') {
    url++;
    ptr = url;
    /* first occurence of ">" is the end of url */
    url_end = strchr(ptr, '>');

    if (url_end == NULL)
      return OSIP_SYNTAXERROR;

    url_end--;
    gen_params = strchr(url_end, ';');
  }

  /* define url_end and gen_params for addr-spec */
  if (url_end == NULL) {
    /* rfc3261 // 20.10 Contact:
       Even if the "display-name" is empty, the "name-addr" form MUST be
       used if the "addr-spec" contains a comma, semicolon, or question
       mark.  There may or may not be LWS between the display-name and the
       "<".
       Conclusion: there is no semicolon (in username) before the semicolon generic param delimiter... */
    gen_params = strchr(url, ';');

    if (gen_params != NULL)
      url_end = gen_params - 1;

    else
      url_end = url + strlen(url);
  }

  if (gen_params != NULL) { /* now we are sure a param exist */
    i = __osip_generic_param_parseall(&from->gen_params, gen_params);

    if (i != 0) {
      return i;
    }
  }

  /* set the url */
  {
    char *tmp;

    if (url_end - url + 2 < 7)
      return OSIP_SYNTAXERROR;

    i = osip_uri_init(&(from->url));

    if (i != 0)
      return i;

    tmp = (char *) osip_malloc(url_end - url + 2);

    if (tmp == NULL)
      return OSIP_NOMEM;

    osip_strncpy(tmp, url, url_end - url + 1);
    i = osip_uri_parse(from->url, tmp);
    osip_free(tmp);

    if (i != 0)
      return i;
  }
  return OSIP_SUCCESS;
}

/* returns the from header as a string.  */
/* INPUT : osip_from_t *from | from header.   */
/* returns -1 on error. */
int osip_from_to_str(const osip_from_t *from, char **dest) {
  char *url;
  char *buf;
  int i;
  size_t len;

  *dest = NULL;

  if ((from == NULL) || (from->url == NULL))
    return OSIP_BADPARAMETER;

  i = osip_uri_to_str(from->url, &url);

  if (i != 0)
    return i;

  if (from->displayname == NULL)
    len = strlen(url) + 5;

  else
    len = strlen(url) + strlen(from->displayname) + 5;

  buf = (char *) osip_malloc(len);

  if (buf == NULL) {
    osip_free(url);
    return OSIP_NOMEM;
  }

  if (from->displayname != NULL)
    sprintf(buf, "%s <%s>", from->displayname, url);

  else
    /* from rfc2543bis-04: for authentication related issue!
       "The To and From header fields always include the < and >
       delimiters even if the display-name is empty." */
    sprintf(buf, "<%s>", url);

  osip_free(url);

  {
    size_t plen;
    char *tmp;
    osip_list_iterator_t it;
    osip_generic_param_t *u_param = (osip_generic_param_t *) osip_list_get_first(&from->gen_params, &it);

    while (u_param != OSIP_SUCCESS) {
      if (u_param->gvalue == NULL)
        plen = strlen(u_param->gname) + 2;

      else
        plen = strlen(u_param->gname) + strlen(u_param->gvalue) + 3;

      len = len + plen;
      buf = (char *) osip_realloc(buf, len);
      tmp = buf;
      tmp = tmp + strlen(tmp);

      if (u_param->gvalue == NULL)
        snprintf(tmp, len - (tmp - buf), ";%s", u_param->gname);

      else
        snprintf(tmp, len - (tmp - buf), ";%s=%s", u_param->gname, u_param->gvalue);

      u_param = (osip_generic_param_t *) osip_list_get_next(&it);
    }
  }
  *dest = buf;
  return OSIP_SUCCESS;
}

char *osip_from_get_displayname(osip_from_t *from) {
  if (from == NULL)
    return NULL;

  return from->displayname;
}

void osip_from_set_displayname(osip_from_t *from, char *displayname) {
  from->displayname = displayname;
}

osip_uri_t *osip_from_get_url(osip_from_t *from) {
  if (from == NULL)
    return NULL;

  return from->url;
}

void osip_from_set_url(osip_from_t *from, osip_uri_t *url) {
  from->url = url;
}

int osip_from_param_get(osip_from_t *from, int pos, osip_generic_param_t **fparam) {
  *fparam = NULL;

  if (from == NULL)
    return OSIP_BADPARAMETER;

  if (osip_list_size(&from->gen_params) <= pos)
    return OSIP_UNDEFINED_ERROR; /* does not exist */

  *fparam = (osip_generic_param_t *) osip_list_get(&from->gen_params, pos);
  return pos;
}

int osip_from_clone(const osip_from_t *from, osip_from_t **dest) {
  int i;
  osip_from_t *fr;

  *dest = NULL;

  if (from == NULL)
    return OSIP_BADPARAMETER;

  i = osip_from_init(&fr);

  if (i != 0) /* allocation failed */
    return i;

  if (from->displayname != NULL) {
    fr->displayname = osip_strdup(from->displayname);

    if (fr->displayname == NULL) {
      osip_from_free(fr);
      return OSIP_NOMEM;
    }
  }

  if (from->url != NULL) {
    i = osip_uri_clone(from->url, &(fr->url));

    if (i != 0) {
      osip_from_free(fr);
      return i;
    }
  }

  i = osip_list_clone(&from->gen_params, &fr->gen_params, (int (*)(void *, void **)) & osip_generic_param_clone);

  if (i != 0) {
    osip_from_free(fr);
    return i;
  }

  *dest = fr;
  return OSIP_SUCCESS;
}

int osip_from_compare(osip_from_t *from1, osip_from_t *from2) {
  char *tag1;
  char *tag2;

  if (from1 == NULL || from2 == NULL)
    return OSIP_BADPARAMETER;

  if (from1->url == NULL || from2->url == NULL)
    return OSIP_BADPARAMETER;

  /* we could have a sip or sips url, but if string!=NULL,
     host part will be NULL. */
  if (from1->url->host == NULL && from2->url->host == NULL) {
    if (from1->url->string == NULL || from2->url->string == NULL)
      return OSIP_UNDEFINED_ERROR;

    if (0 == strcmp(from1->url->string, from2->url->string))
      return OSIP_SUCCESS;
  }

  if (from1->url->host == NULL || from2->url->host == NULL)
    return OSIP_UNDEFINED_ERROR;

  /* compare url including tag */
  if (0 != strcmp(from1->url->host, from2->url->host))
    return OSIP_UNDEFINED_ERROR;

  if (from1->url->username != NULL && from2->url->username != NULL)
    if (0 != strcmp(from1->url->username, from2->url->username))
      return OSIP_UNDEFINED_ERROR;

  tag1 = NULL;
  tag2 = NULL;
  {
    osip_list_iterator_t it;
    osip_generic_param_t *u_param = (osip_generic_param_t *) osip_list_get_first(&from1->gen_params, &it);

    while (u_param != OSIP_SUCCESS) {
      if (0 == strncmp(u_param->gname, "tag", 3)) {
        tag1 = u_param->gvalue;
        break;
      }

      u_param = (osip_generic_param_t *) osip_list_get_next(&it);
    }
  }
  {
    osip_list_iterator_t it;
    osip_generic_param_t *u_param = (osip_generic_param_t *) osip_list_get_first(&from2->gen_params, &it);

    while (u_param != OSIP_SUCCESS) {
      if (0 == strncmp(u_param->gname, "tag", 3)) {
        tag2 = u_param->gvalue;
        break;
      }

      u_param = (osip_generic_param_t *) osip_list_get_next(&it);
    }
  }

  /* sounds like a BUG!
     if tag2 exists and tag1 does not, then it will
     return OSIP_SUCCESS;
     in the first request, (INVITE) the To field does not
     contain any tag. The response contains one! and the
     response must match the request....
   */
  /* so we test the tags only when both exist! */
  if (tag1 != NULL && tag2 != NULL)
    if (0 != strcmp(tag1, tag2))
      return OSIP_UNDEFINED_ERROR;

  /* We could return a special case, when */
  /* only one tag exists?? */

  return OSIP_SUCCESS; /* return code changed to 0 from release 0.6.1 */
}

int __osip_generic_param_parseall(osip_list_t *gen_params, const char *params) {
  int i;
  char *pname;
  char *pvalue;

  const char *comma;
  const char *equal;
  const char *startquote;
  const char *endquote;

  /* find '=' wich is the separator for one param */
  /* find ';' wich is the separator for multiple params */

  equal = next_separator(params + 1, '=', ';');
  comma = strchr(params + 1, ';');

  /* If comma points after value start quote, move it to after end quote */
  if (equal != NULL) {
    const char *tmp;

    startquote = NULL;

    for (tmp = equal + 1; tmp[0] == ' '; tmp++) {
    }

    if (tmp[0] == '"')
      startquote = tmp;

    if (startquote != NULL && comma > startquote) {
      comma = NULL;
      endquote = __osip_quote_find(startquote + 1);

      if (endquote)
        comma = strchr(endquote, ';');
    }
  }

  while (comma != NULL) {
    if (equal == NULL) {
      equal = comma;
      pvalue = NULL;

    } else {
      const char *tmp;

      /* check for NULL param with an '=' character */
      tmp = equal + 1;
      tmp += strspn(tmp, "\t ");
      pvalue = NULL;

      if (*tmp != ',' && *tmp != '\0') {
        if (comma - equal < 2)
          return OSIP_SYNTAXERROR;

        pvalue = (char *) osip_malloc(comma - equal);

        if (pvalue == NULL)
          return OSIP_NOMEM;

        osip_strncpy(pvalue, equal + 1, comma - equal - 1);
      }
    }

    if (equal - params < 2) {
      osip_free(pvalue);
      return OSIP_SYNTAXERROR;
    }

    pname = (char *) osip_malloc(equal - params);

    if (pname == NULL) {
      osip_free(pvalue);
      return OSIP_NOMEM;
    }

    osip_strncpy(pname, params + 1, equal - params - 1);

    i = osip_generic_param_add(gen_params, pname, pvalue);

    if (i != OSIP_SUCCESS) {
      osip_free(pname);
      osip_free(pvalue);
      return OSIP_NOMEM;
    }

    params = comma;
    equal = next_separator(params + 1, '=', ';');
    comma = strchr(params + 1, ';');

    /* If comma points after value start quote, move it to after end quote */
    if (equal != NULL) {
      const char *tmp;

      startquote = NULL;

      for (tmp = equal + 1; tmp[0] == ' '; tmp++) {
      }

      if (tmp[0] == '"')
        startquote = tmp;

      if (startquote != NULL && comma > startquote) {
        comma = NULL;
        endquote = __osip_quote_find(startquote + 1);

        if (endquote)
          comma = strchr(endquote, ';');
      }
    }
  }

  /* this is the last header (comma==NULL) */
  comma = params + strlen(params);

  if (equal == NULL) {
    equal = comma; /* at the end */
    pvalue = NULL;

    if (equal - params < 2) {
      osip_free(pvalue);
      return OSIP_SUCCESS; /* empty comma? */
    }

  } else {
    const char *tmp;

    /* check for NULL param with an '=' character */
    tmp = equal + 1;
    tmp += strspn(tmp, "\t ");
    pvalue = NULL;

    if (*tmp != ',' && *tmp != '\0') {
      if (comma - equal < 2)
        return OSIP_SYNTAXERROR;

      pvalue = (char *) osip_malloc(comma - equal);

      if (pvalue == NULL)
        return OSIP_NOMEM;

      osip_strncpy(pvalue, equal + 1, comma - equal - 1);
    }
  }

  if (equal - params < 2) {
    osip_free(pvalue);
    return OSIP_SYNTAXERROR;
  }

  pname = (char *) osip_malloc(equal - params);

  if (pname == NULL) {
    osip_free(pvalue);
    return OSIP_NOMEM;
  }

  osip_strncpy(pname, params + 1, equal - params - 1);

  i = osip_generic_param_add(gen_params, pname, pvalue);

  if (i != OSIP_SUCCESS) {
    osip_free(pname);
    osip_free(pvalue);
    return OSIP_NOMEM;
  }

  return OSIP_SUCCESS;
}

void osip_generic_param_set_value(osip_generic_param_t *fparam, char *value) {
  fparam->gvalue = value;
}

char *osip_generic_param_get_name(const osip_generic_param_t *fparam) {
  if (fparam == NULL)
    return NULL;

  return fparam->gname;
}

void osip_generic_param_set_name(osip_generic_param_t *fparam, char *name) {
  fparam->gname = name;
}

char *osip_generic_param_get_value(const osip_generic_param_t *fparam) {
  if (fparam == NULL)
    return NULL;

  if (fparam->gname == NULL)
    return NULL; /* name is mandatory */

  return fparam->gvalue;
}

int osip_from_tag_match(osip_from_t *from1, osip_from_t *from2) {
  osip_generic_param_t *tag_from1;
  osip_generic_param_t *tag_from2;

  if (from1 == NULL || from2 == NULL)
    return OSIP_BADPARAMETER;

  osip_from_param_get_byname(from1, "tag", &tag_from1);
  osip_from_param_get_byname(from2, "tag", &tag_from2);

  if (tag_from1 == NULL && tag_from2 == NULL)
    return OSIP_SUCCESS;

  if ((tag_from1 != NULL && tag_from2 == NULL) || (tag_from1 == NULL && tag_from2 != NULL))
    return OSIP_UNDEFINED_ERROR;

  if (tag_from1->gvalue == NULL || tag_from2->gvalue == NULL)
    return OSIP_UNDEFINED_ERROR;

  if (0 != strcmp(tag_from1->gvalue, tag_from2->gvalue))
    return OSIP_UNDEFINED_ERROR;

  return OSIP_SUCCESS;
}