/*
  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_parser.h>

#define MIME_MAX_BOUNDARY_LEN 70

extern const char *osip_protocol_version;

static int strcat_simple_header(char **_string, size_t *malloc_size, char **_message, void *ptr_header, char *header_name, size_t size_of_header, int (*xxx_to_str)(void *, char **), char **next);
static int strcat_headers_one_per_line(char **_string, size_t *malloc_size, char **_message, osip_list_t *headers, char *header, size_t size_of_header, int (*xxx_to_str)(void *, char **), char **next);

static int __osip_message_startline_to_strreq(osip_message_t *sip, char **dest) {
  const char *sip_version;
  char *tmp;
  char *rquri;
  int i;

  *dest = NULL;

  if ((sip == NULL) || (sip->req_uri == NULL) || (sip->sip_method == NULL))
    return OSIP_BADPARAMETER;

  i = osip_uri_to_str(sip->req_uri, &rquri);

  if (i != 0)
    return i;

  if (sip->sip_version == NULL)
    sip_version = osip_protocol_version;

  else
    sip_version = sip->sip_version;

  *dest = (char *) osip_malloc(strlen(sip->sip_method) + strlen(rquri) + strlen(sip_version) + 3);

  if (*dest == NULL) {
    osip_free(rquri);
    return OSIP_NOMEM;
  }

  tmp = *dest;

  tmp = osip_str_append(tmp, sip->sip_method);
  *tmp = ' ';
  tmp++;
  tmp = osip_str_append(tmp, rquri);
  *tmp = ' ';
  tmp++;
  strcpy(tmp, sip_version);

  osip_free(rquri);
  return OSIP_SUCCESS;
}

static int __osip_message_startline_to_strresp(osip_message_t *sip, char **dest) {
  char *tmp;
  const char *sip_version;
  char status_code[5];

  *dest = NULL;

  if ((sip == NULL) || (sip->reason_phrase == NULL) || (sip->status_code < 100) || (sip->status_code > 699))
    return OSIP_BADPARAMETER;

  if (sip->sip_version == NULL)
    sip_version = osip_protocol_version;

  else
    sip_version = sip->sip_version;

  sprintf(status_code, "%u", sip->status_code);

  *dest = (char *) osip_malloc(strlen(sip_version) + 3 + strlen(sip->reason_phrase) + 4);

  if (*dest == NULL)
    return OSIP_NOMEM;

  tmp = *dest;

  tmp = osip_str_append(tmp, sip_version);
  *tmp = ' ';
  tmp++;

  tmp = osip_strn_append(tmp, status_code, 3);
  *tmp = ' ';
  tmp++;
  strcpy(tmp, sip->reason_phrase);

  return OSIP_SUCCESS;
}

static int __osip_message_startline_to_str(osip_message_t *sip, char **dest) {
  if (sip->sip_method != NULL)
    return __osip_message_startline_to_strreq(sip, dest);

  if (sip->status_code != 0)
    return __osip_message_startline_to_strresp(sip, dest);

  OSIP_TRACE(osip_trace(__FILE__, __LINE__, TRACE_LEVEL1, NULL, "ERROR method has no value or status code is 0!\n"));
  return OSIP_BADPARAMETER; /* should never come here */
}

char *osip_message_get_reason_phrase(const osip_message_t *sip) {
  return sip->reason_phrase;
}

int osip_message_get_status_code(const osip_message_t *sip) {
  return sip->status_code;
}

char *osip_message_get_method(const osip_message_t *sip) {
  return sip->sip_method;
}

char *osip_message_get_version(const osip_message_t *sip) {
  return sip->sip_version;
}

osip_uri_t *osip_message_get_uri(const osip_message_t *sip) {
  return sip->req_uri;
}

static int strcat_simple_header(char **_string, size_t *malloc_size, char **_message, void *ptr_header, char *header_name, size_t size_of_header, int (*xxx_to_str)(void *, char **), char **next) {
  char *string;
  char *message;
  char *tmp;
  int i;

  string = *_string;
  message = *_message;

  if (ptr_header != NULL) {
    if (*malloc_size < message - string + 100 + size_of_header) {
      /* take some memory in order to avoid using osip_realloc too often */
      size_t size = message - string;

      *malloc_size = message - string + size_of_header + 100;
      string = osip_realloc(string, *malloc_size);

      if (string == NULL) {
        osip_free(*_string); /* pointer for string */
        *_string = NULL;
        *_message = NULL;
        return OSIP_NOMEM;
      }

      *_string = string;
      message = string + size;
    }

    message = osip_strn_append(message, header_name, size_of_header);

    i = xxx_to_str(ptr_header, &tmp);

    if (i != 0) {
      *_string = string;
      *_message = message;
      *next = NULL;
      return i;
    }

    if (*malloc_size < message - string + strlen(tmp) + 100) {
      size_t size = message - string;

      *malloc_size = message - string + strlen(tmp) + 100;
      string = osip_realloc(string, *malloc_size);

      if (string == NULL) {
        osip_free(*_string); /* pointer for string */
        *_string = NULL;
        *_message = NULL;
        return OSIP_NOMEM;
      }

      *_string = string;
      message = string + size;
    }

    message = osip_str_append(message, tmp);
    osip_free(tmp);
    message = osip_strn_append(message, OSIP_CRLF, 2);
  }

  *_string = string;
  *_message = message;
  *next = message;
  return OSIP_SUCCESS;
}

static int strcat_headers_one_per_line(char **_string, size_t *malloc_size, char **_message, osip_list_t *headers, char *header, size_t size_of_header, int (*xxx_to_str)(void *, char **), char **next) {
  char *string;
  char *message;
  char *tmp;
  int i;
  osip_list_iterator_t it;
  void *elt = osip_list_get_first(headers, &it);

  string = *_string;
  message = *_message;

  while (elt != OSIP_SUCCESS) {
    if (*malloc_size < message - string + 100 + size_of_header)
    /* take some memory avoid to osip_realloc too much often */
    {
      /* should not happen often */
      size_t size = message - string;

      *malloc_size = message - string + size_of_header + 100;
      string = osip_realloc(string, *malloc_size);

      if (string == NULL) {
        osip_free(*_string); /* pointer for string */
        *_string = NULL;
        *_message = NULL;
        return OSIP_NOMEM;
      }

      *_string = string;
      message = string + size;
    }

    osip_strncpy(message, header, size_of_header);
    i = xxx_to_str(elt, &tmp);

    if (i != 0) {
      *_string = string;
      *_message = message;
      *next = NULL;
      return i;
    }

    message = message + strlen(message);

    if (*malloc_size < message - string + strlen(tmp) + 100) {
      size_t size = message - string;

      *malloc_size = message - string + strlen(tmp) + 100;
      string = osip_realloc(string, *malloc_size);

      if (string == NULL) {
        osip_free(*_string); /* pointer for string */
        *_string = NULL;
        *_message = NULL;
        return OSIP_NOMEM;
      }

      *_string = string;
      message = string + size;
    }

    message = osip_str_append(message, tmp);
    osip_free(tmp);
    message = osip_strn_append(message, OSIP_CRLF, 2);
    elt = osip_list_get_next(&it);
  }

  *_string = string;
  *_message = message;
  *next = message;
  return OSIP_SUCCESS;
}

/* return values:
   1: structure and buffer "message" are identical.
   2: buffer "message" is not up to date with the structure info (call osip_message_to_str to update it).
   -1 on error.
 */
int osip_message_get__property(const osip_message_t *sip) {
  if (sip == NULL)
    return OSIP_BADPARAMETER;

  return sip->message_property;
}

int osip_message_force_update(osip_message_t *sip) {
  if (sip == NULL)
    return OSIP_BADPARAMETER;

  sip->message_property = 2;
  return OSIP_SUCCESS;
}

static int _osip_message_realloc(char **message, char **dest, size_t needed, size_t *malloc_size) {
  size_t size = *message - *dest;

  if (*malloc_size < (size_t)(size + needed + 100)) {
    *malloc_size = size + needed + 100;
    *dest = osip_realloc(*dest, *malloc_size);

    if (*dest == NULL)
      return OSIP_NOMEM;

    *message = *dest + size;
  }

  return OSIP_SUCCESS;
}

static int _osip_message_to_str(osip_message_t *sip, char **dest, size_t *message_length, int sipfrag) {
  size_t malloc_size;
  size_t total_length = 0;

  /* Added at SIPit day1 */
  char *start_of_bodies;
  char *content_length_to_modify = NULL;

  char *message;
  char *next;
  char *tmp;
  int pos;
  int i;
  char *boundary = NULL;

  malloc_size = SIP_MESSAGE_MAX_LENGTH;

  *dest = NULL;

  if (sip == NULL)
    return OSIP_BADPARAMETER;

  {
    if (1 == osip_message_get__property(sip)) { /* message is already available in "message" */

      *dest = osip_malloc(sip->message_length + 1);

      if (*dest == NULL)
        return OSIP_NOMEM;

      memcpy(*dest, sip->message, sip->message_length);
      (*dest)[sip->message_length] = '\0';

      if (message_length != NULL)
        *message_length = sip->message_length;

      return OSIP_SUCCESS;

    } else {
      /* message should be rebuilt: delete the old one if exists. */
      osip_free(sip->message);
      sip->message = NULL;
    }
  }

  message = (char *) osip_malloc(SIP_MESSAGE_MAX_LENGTH); /* ???? message could be > 4000  */

  if (message == NULL)
    return OSIP_NOMEM;

  *dest = message;

  /* add the first line of message */
  i = __osip_message_startline_to_str(sip, &tmp);

  if (i != 0) {
    if (!sipfrag) {
      osip_free(*dest);
      *dest = NULL;
      return i;
    }

    /* A start-line isn't required for message/sipfrag parts. */

  } else {
    size_t message_len = strlen(tmp);

    if (_osip_message_realloc(&message, dest, message_len + 3, &malloc_size) < 0) {
      osip_free(tmp);
      *dest = NULL;
      return OSIP_NOMEM;
    }

    message = osip_str_append(message, tmp);
    osip_free(tmp);
    message = osip_strn_append(message, OSIP_CRLF, 2);
  }

  {
    struct to_str_table {
      char header_name[30];
      int header_length;
      osip_list_t *header_list;
      void *header_data;
      int (*to_str)(void *, char **);
    }
#ifndef MINISIZE
    table[25] =
#else
    table[16] =
#endif
        {{"Via: ", 5, NULL, NULL, (int (*)(void *, char **)) & osip_via_to_str},
         {"Record-Route: ", 14, NULL, NULL, (int (*)(void *, char **)) & osip_record_route_to_str},
         {"Route: ", 7, NULL, NULL, (int (*)(void *, char **)) & osip_route_to_str},
         {"From: ", 6, NULL, NULL, (int (*)(void *, char **)) & osip_from_to_str},
         {"To: ", 4, NULL, NULL, (int (*)(void *, char **)) & osip_to_to_str},
         {"Call-ID: ", 9, NULL, NULL, (int (*)(void *, char **)) & osip_call_id_to_str},
         {"CSeq: ", 6, NULL, NULL, (int (*)(void *, char **)) & osip_cseq_to_str},
         {"Contact: ", 9, NULL, NULL, (int (*)(void *, char **)) & osip_contact_to_str},
         {"Authorization: ", 15, NULL, NULL, (int (*)(void *, char **)) & osip_authorization_to_str},
         {"WWW-Authenticate: ", 18, NULL, NULL, (int (*)(void *, char **)) & osip_www_authenticate_to_str},
         {"Proxy-Authenticate: ", 20, NULL, NULL, (int (*)(void *, char **)) & osip_www_authenticate_to_str},
         {"Proxy-Authorization: ", 21, NULL, NULL, (int (*)(void *, char **)) & osip_authorization_to_str},
         {"Call-Info: ", 11, NULL, NULL, (int (*)(void *, char **)) & osip_call_info_to_str},
         {"Content-Type: ", 14, NULL, NULL, (int (*)(void *, char **)) & osip_content_type_to_str},
         {"Mime-Version: ", 14, NULL, NULL, (int (*)(void *, char **)) & osip_content_length_to_str},
#ifndef MINISIZE
         {"Allow: ", 7, NULL, NULL, (int (*)(void *, char **)) & osip_allow_to_str},
         {"Content-Encoding: ", 18, NULL, NULL, (int (*)(void *, char **)) & osip_content_encoding_to_str},
         {"Alert-Info: ", 12, NULL, NULL, (int (*)(void *, char **)) & osip_call_info_to_str},
         {"Error-Info: ", 12, NULL, NULL, (int (*)(void *, char **)) & osip_call_info_to_str},
         {"Accept: ", 8, NULL, NULL, (int (*)(void *, char **)) & osip_accept_to_str},
         {"Accept-Encoding: ", 17, NULL, NULL, (int (*)(void *, char **)) & osip_accept_encoding_to_str},
         {"Accept-Language: ", 17, NULL, NULL, (int (*)(void *, char **)) & osip_accept_language_to_str},
         {"Authentication-Info: ", 21, NULL, NULL, (int (*)(void *, char **)) & osip_authentication_info_to_str},
         {"Proxy-Authentication-Info: ", 27, NULL, NULL, (int (*)(void *, char **)) & osip_authentication_info_to_str},
#endif
         {{'\0'}, 0, NULL, NULL, NULL}};
    table[0].header_list = &sip->vias;
    table[1].header_list = &sip->record_routes;
    table[2].header_list = &sip->routes;
    table[3].header_data = sip->from;
    table[4].header_data = sip->to;
    table[5].header_data = sip->call_id;
    table[6].header_data = sip->cseq;
    table[7].header_list = &sip->contacts;
    table[8].header_list = &sip->authorizations;
    table[9].header_list = &sip->www_authenticates;
    table[10].header_list = &sip->proxy_authenticates;
    table[11].header_list = &sip->proxy_authorizations;
    table[12].header_list = &sip->call_infos;
    table[13].header_data = sip->content_type;
    table[14].header_data = sip->mime_version;
#ifndef MINISIZE
    table[15].header_list = &sip->allows;
    table[16].header_list = &sip->content_encodings;
    table[17].header_list = &sip->alert_infos;
    table[18].header_list = &sip->error_infos;
    table[19].header_list = &sip->accepts;
    table[20].header_list = &sip->accept_encodings;
    table[21].header_list = &sip->accept_languages;
    table[22].header_list = &sip->authentication_infos;
    table[23].header_list = &sip->proxy_authentication_infos;
#endif

    pos = 0;

    while (table[pos].header_name[0] != '\0') {
      if (table[13].header_list == NULL)
        i = strcat_simple_header(dest, &malloc_size, &message, table[pos].header_data, table[pos].header_name, table[pos].header_length, ((int (*)(void *, char **)) table[pos].to_str), &next);

      i = strcat_headers_one_per_line(dest, &malloc_size, &message, table[pos].header_list, table[pos].header_name, table[pos].header_length, ((int (*)(void *, char **)) table[pos].to_str), &next);

      if (i != 0) {
        osip_free(*dest);
        *dest = NULL;
        return i;
      }

      message = next;

      pos++;
    }
  }

  {
    osip_list_iterator_t it;
    osip_header_t *header = (osip_header_t *) osip_list_get_first(&sip->headers, &it);

    while (header != OSIP_SUCCESS) {
      size_t header_len = 0;

      i = osip_header_to_str(header, &tmp);

      if (i != 0) {
        osip_free(*dest);
        *dest = NULL;
        return i;
      }

      header_len = strlen(tmp);

      if (_osip_message_realloc(&message, dest, header_len + 3, &malloc_size) < 0) {
        osip_free(tmp);
        *dest = NULL;
        return OSIP_NOMEM;
      }

      message = osip_str_append(message, tmp);
      osip_free(tmp);
      message = osip_strn_append(message, OSIP_CRLF, 2);

      header = (osip_header_t *) osip_list_get_next(&it);
    }
  }

  /* we have to create the body before adding the contentlength */
  /* add enough lenght for "Content-Length: " */

  if (_osip_message_realloc(&message, dest, 16, &malloc_size) < 0)
    return OSIP_NOMEM;

  if (sipfrag && osip_list_eol(&sip->bodies, 0)) {
    /* end of headers */
    osip_strncpy(message, OSIP_CRLF, 2);
    message = message + 2;

    /* same remark as at the beginning of the method */
    sip->message_property = 1;
    sip->message = osip_strdup(*dest);
    sip->message_length = message - *dest;

    if (message_length != NULL)
      *message_length = message - *dest;

    return OSIP_SUCCESS; /* it's all done */
  }

  osip_strncpy(message, "Content-Length: ", 16);
  message = message + 16;

  /* SIPit Day1
     ALWAYS RECALCULATE?
     if (sip->contentlength!=NULL)
     {
     i = osip_content_length_to_str(sip->contentlength, &tmp);
     if (i!=0) {
     osip_free(*dest);
     *dest = NULL;
     return i;
     }
     osip_strncpy(message,tmp,strlen(tmp));
     osip_free(tmp);
     }
     else
     { */
  if (osip_list_eol(&sip->bodies, 0)) /* no body */
    message = osip_strn_append(message, "0", 1);

  else {
    /* BUG: p130 (rfc2543bis-04)
       "No SP after last token or quoted string"

       In fact, if extra spaces exist: the stack can't be used
       to make user-agent that wants to make authentication...
       This should be changed...
     */

    content_length_to_modify = message;
    message = osip_str_append(message, "     ");
  }

  /*  } */

  message = osip_strn_append(message, OSIP_CRLF, 2);

  /* end of headers */
  message = osip_strn_append(message, OSIP_CRLF, 2);

  start_of_bodies = message;
  total_length = start_of_bodies - *dest;

  if (osip_list_eol(&sip->bodies, 0)) {
    /* same remark as at the beginning of the method */
    sip->message_property = 1;
    sip->message = osip_strdup(*dest);
    sip->message_length = total_length;

    if (message_length != NULL)
      *message_length = total_length;

    return OSIP_SUCCESS; /* it's all done */
  }

  if (sip->content_type && sip->content_type->type && !osip_strcasecmp(sip->content_type->type, "multipart")) {
    osip_generic_param_t *ct_param = NULL;

    /* find the boundary */
    i = osip_generic_param_get_byname(&sip->content_type->gen_params, "boundary", &ct_param);

    if ((i >= 0) && ct_param && ct_param->gvalue) {
      size_t len = strlen(ct_param->gvalue);

      if (len > MIME_MAX_BOUNDARY_LEN) {
        osip_free(*dest);
        *dest = NULL;
        return OSIP_SYNTAXERROR;
      }

      if (len == 1 && ct_param->gvalue[0] == '"') { /* fixed Jan 10,2020: avoid a negative length copy if boundary contains only one quote */
        osip_free(*dest);
        *dest = NULL;
        return OSIP_SYNTAXERROR;
      }

      if (len == 2 && ct_param->gvalue[0] == '"' && ct_param->gvalue[1] == '"') { /* do not accept empty boundary */
        osip_free(*dest);
        *dest = NULL;
        return OSIP_SYNTAXERROR;
      }

      boundary = osip_malloc(len + 5);

      if (boundary == NULL) {
        osip_free(*dest);
        *dest = NULL;
        return OSIP_NOMEM;
      }

      osip_strncpy(boundary, OSIP_CRLF, 2);
      osip_strncpy(boundary + 2, "--", 2);

      if (ct_param->gvalue[0] == '"' && ct_param->gvalue[len - 1] == '"')
        osip_strncpy(boundary + 4, ct_param->gvalue + 1, len - 2);

      else
        osip_strncpy(boundary + 4, ct_param->gvalue, len);
    }
  }

  {
    osip_list_iterator_t it;
    osip_body_t *body = (osip_body_t *) osip_list_get_first(&sip->bodies, &it);

    while (body != OSIP_SUCCESS) {
      size_t body_length;

      if (boundary) {
        /* Needs at most 77 bytes,
           last realloc allocate at least 100 bytes extra */
        message = osip_str_append(message, boundary);
        message = osip_strn_append(message, OSIP_CRLF, 2);
      }

      i = osip_body_to_str(body, &tmp, &body_length);

      if (i != 0) {
        osip_free(*dest);
        *dest = NULL;

        if (boundary)
          osip_free(boundary);

        return i;
      }

      if (malloc_size < message - *dest + 100 + body_length) {
        size_t size = message - *dest;
        int offset_of_body;
        int offset_content_length_to_modify = 0;

        offset_of_body = (int) (start_of_bodies - *dest);

        if (content_length_to_modify != NULL)
          offset_content_length_to_modify = (int) (content_length_to_modify - *dest);

        malloc_size = message - *dest + body_length + 100;
        *dest = osip_realloc(*dest, malloc_size);

        if (*dest == NULL) {
          osip_free(tmp); /* fixed 09/Jun/2005 */

          if (boundary)
            osip_free(boundary);

          return OSIP_NOMEM;
        }

        start_of_bodies = *dest + offset_of_body;

        if (content_length_to_modify != NULL)
          content_length_to_modify = *dest + offset_content_length_to_modify;

        message = *dest + size;
      }

      memcpy(message, tmp, body_length);
      message[body_length] = '\0';
      osip_free(tmp);
      message = message + body_length;

      body = (osip_body_t *) osip_list_get_next(&it);
    }
  }

  if (boundary) {
    /* Needs at most 79 bytes,
       last realloc allocate at least 100 bytes extra */
    message = osip_str_append(message, boundary);
    message = osip_strn_append(message, "--", 2);
    message = osip_strn_append(message, OSIP_CRLF, 2);

    osip_free(boundary);
    boundary = NULL;
  }

  if (content_length_to_modify == NULL) {
    osip_free(*dest);
    *dest = NULL;
    return OSIP_SYNTAXERROR;
  }

  /* we NOW have the length of bodies: */
  {
    size_t size = message - start_of_bodies;
    char tmp2[15];

    total_length += size;
    snprintf(tmp2, 15, "%i", (int) size);
    /* do not use osip_strncpy here! */
    memcpy(content_length_to_modify + 5 - strlen(tmp2), tmp2, strlen(tmp2));
  }

  /* same remark as at the beginning of the method */
  sip->message_property = 1;
  sip->message = osip_malloc(total_length + 1);

  if (sip->message != NULL) {
    memcpy(sip->message, *dest, total_length);
    sip->message[total_length] = '\0';
    sip->message_length = total_length;

    if (message_length != NULL)
      *message_length = total_length;
  }

  return OSIP_SUCCESS;
}

int osip_message_to_str(osip_message_t *sip, char **dest, size_t *message_length) {
  return _osip_message_to_str(sip, dest, message_length, 0);
}

int osip_message_to_str_sipfrag(osip_message_t *sip, char **dest, size_t *message_length) {
  return _osip_message_to_str(sip, dest, message_length, 1);
}