/*
** Return the default restriction GLOB
*/
const char *robot_restrict_default(void){
  return "timelineX,diff,annotate,zip,fileage,file";
}

/*
** Return true if zTag matches one of the tags in the robot-restrict
** setting.
*/
int robot_restrict_has_tag(const char *zTag){
  static const char *zGlob = 0;
  if( zGlob==0 ){
    zGlob = db_get("robot-restrict",robot_restrict_default());
    if( zGlob==0 ) zGlob = "";
  }
  if( zGlob[0]==0 || fossil_strcmp(zGlob, "off")==0 ){
    return 0;
  }
  return glob_multi_match(zGlob,zTag);
}

/*
** Check to see if the page named in the argument is on the
** robot-restrict list.  If it is on the list and if the user
** is "nobody" then bring up a captcha to test to make sure that
** client is not a robot.
**
** This routine returns true if a captcha was rendered and if subsequent
** page generation should be aborted.  It returns false if the page
** should not be restricted and should be rendered normally.
*/
int robot_restrict(const char *zPage){
int robot_restrict(const char *zTag){
  const char *zGlob;
  static int bKnownPass = 0;

  if( robot.resultCache==KNOWN_NOT_ROBOT ) return 0;
  if( bKnownPass ) return 0;
  zGlob = db_get("robot-restrict",robot_restrict_default());
  if( !robot_restrict_has_tag(zTag) ) return 0;
  if( zGlob==0 || zGlob[0]==0 || fossil_strcmp(zGlob, "off")==0 ){
    bKnownPass = 1;
    return 0;   /* Robot restriction is turned off */
  }
  if( !glob_multi_match(zGlob, zPage) ) return 0;
  if( !client_might_be_a_robot() ) return 0;

  /* Generate the proof-of-work captcha */   
  ask_for_proof_that_client_is_not_robot();
  return 1;
}