#define _XOPEN_SOURCE 700
#include <libowfat/buffer.h>
#include <libowfat/errmsg.h>
#include <unistd.h>
#include <stdlib.h>

#include "nobotgate.h"

#define dieusage() die(100,"usage: ",argv0," tokenfile allowed-handler denied-handler")

static stralloc token;
static char *tokenfile, *cmd_valid, *cmd_invalid;

static void run(void) {
  char tmp[]=PATH_TMP"/nobotgate.XXXXXX";
  int tmpfd;
  char buf[8192];
  buffer b;
  char *cmd;
  tmpfd=mkstemp(tmp);
  if (tmpfd<0) diesys(111,"create temporary file ",tmp);

  buffer_init_write(&b,tmpfd,buf,sizeof buf);
  if (!send_headers(buffer_0,&b))
    die(111,"copy stdin to temporary file");

  lseek(tmpfd,0,SEEK_SET);
  buffer_init_read(&b,tmpfd,buf,sizeof buf);
  if (!parse_token(&b,&token)) {
    carp("failed to parse token");
    goto err;
  }

  cmd=check_token(tokenfile,&token)
    ? cmd_valid
    : cmd_invalid;
  lseek(tmpfd,0,SEEK_SET);
  dup2(tmpfd,0);
  unlink(tmp);
  buffer_close(&b);
  stralloc_free(&token);
  carp("execing ",cmd);
  execlp(cmd,cmd,NULL);
err:
  unlink(tmp);
  exit(111);
}

int main(int argc,char **argv)
{
  errmsg_iam(*argv);
  argv++; argc--;
  if (argc != 3) dieusage();
  tokenfile=argv[0];
  cmd_valid=argv[1];
  cmd_invalid=argv[2];
  run();
}