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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef NET_BASE_MAPPED_HOST_RESOLVER_H_
      6 #define NET_BASE_MAPPED_HOST_RESOLVER_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "base/memory/scoped_ptr.h"
     12 #include "net/base/host_mapping_rules.h"
     13 #include "net/base/host_resolver.h"
     14 
     15 namespace net {
     16 
     17 // This class wraps an existing HostResolver instance, but modifies the
     18 // request before passing it off to |impl|. This is different from
     19 // MockHostResolver which does the remapping at the HostResolverProc
     20 // layer, so it is able to preserve the effectiveness of the cache.
     21 class MappedHostResolver : public HostResolver {
     22  public:
     23   // Creates a MappedHostResolver that forwards all of its requests through
     24   // |impl|.  It takes ownership of |impl|.
     25   explicit MappedHostResolver(HostResolver* impl);
     26   virtual ~MappedHostResolver();
     27 
     28   // Adds a rule to this mapper. The format of the rule can be one of:
     29   //
     30   //   "MAP" <hostname_pattern> <replacement_host> [":" <replacement_port>]
     31   //   "EXCLUDE" <hostname_pattern>
     32   //
     33   // The <replacement_host> can be either a hostname, or an IP address literal.
     34   //
     35   // Returns true if the rule was successfully parsed and added.
     36   bool AddRuleFromString(const std::string& rule_string) {
     37     return rules_.AddRuleFromString(rule_string);
     38   }
     39 
     40   // Takes a comma separated list of rules, and assigns them to this resolver.
     41   void SetRulesFromString(const std::string& rules_string) {
     42     rules_.SetRulesFromString(rules_string);
     43   }
     44 
     45   // HostResolver methods:
     46   virtual int Resolve(const RequestInfo& info,
     47                       AddressList* addresses,
     48                       CompletionCallback* callback,
     49                       RequestHandle* out_req,
     50                       const BoundNetLog& net_log);
     51   virtual void CancelRequest(RequestHandle req);
     52   virtual void AddObserver(Observer* observer);
     53   virtual void RemoveObserver(Observer* observer);
     54   virtual HostResolverImpl* GetAsHostResolverImpl();
     55 
     56  private:
     57   scoped_ptr<HostResolver> impl_;
     58 
     59   HostMappingRules rules_;
     60 };
     61 
     62 }  // namespace net
     63 
     64 #endif  // NET_BASE_MAPPED_HOST_RESOLVER_H_
     65