plugins/header_rewrite/ruleset.h

/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
//////////////////////////////////////////////////////////////////////////////////////////////
//
// Implement the classes for the various types of hash keys we support.
//
#pragma once

#include <string>

#include "matcher.h"
#include "factory.h"
#include "resources.h"
#include "parser.h"

///////////////////////////////////////////////////////////////////////////////
// Class holding one ruleset. A ruleset is one (or more) pre-conditions, and
// one (or more) operators.
//
class RuleSet
{
public:
  RuleSet() { TSDebug(PLUGIN_NAME_DBG, "RuleSet CTOR"); }

  ~RuleSet()
  {
    TSDebug(PLUGIN_NAME_DBG, "RulesSet DTOR");
    delete next;
    delete _cond;
    delete _oper;
  }

  // noncopyable
  RuleSet(const RuleSet &) = delete;
  void operator=(const RuleSet &) = delete;

  // No reason to inline these
  void append(RuleSet *rule);
  bool add_condition(Parser &p, const char *filename, int lineno);
  bool add_operator(Parser &p, const char *filename, int lineno);
  ResourceIDs get_all_resource_ids() const;

  bool
  has_operator() const
  {
    return nullptr != _oper;
  }

  bool
  has_condition() const
  {
    return nullptr != _cond;
  }

  void
  set_hook(TSHttpHookID hook)
  {
    _hook = hook;
  }

  TSHttpHookID
  get_hook() const
  {
    return _hook;
  }

  ResourceIDs
  get_resource_ids() const
  {
    return _ids;
  }

  bool
  eval(const Resources &res) const
  {
    if (nullptr == _cond) {
      return true;
    } else {
      return _cond->do_eval(res);
    }
  }

  bool
  last() const
  {
    return _last;
  }

  OperModifiers
  exec(const Resources &res) const
  {
    _oper->do_exec(res);
    return _opermods;
  }

  RuleSet *next = nullptr; // Linked list

private:
  Condition *_cond   = nullptr;                        // First pre-condition (linked list)
  Operator *_oper    = nullptr;                        // First operator (linked list)
  TSHttpHookID _hook = TS_HTTP_READ_RESPONSE_HDR_HOOK; // Which hook is this rule for

  // State values (updated when conds / operators are added)
  ResourceIDs _ids        = RSRC_NONE;
  OperModifiers _opermods = OPER_NONE;
  bool _last              = false;
};