src/acl/RequestHeaderStrategy.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_ACLREQUESTHEADERSTRATEGY_H
  10 #define SQUID_ACLREQUESTHEADERSTRATEGY_H
  11 #include "acl/Acl.h"
  12 #include "acl/Data.h"
  13 #include "acl/FilledChecklist.h"
  14 #include "acl/Strategy.h"
  15 #include "HttpRequest.h"
  16
  17 template <http_hdr_type header>
  18
  19 class ACLRequestHeaderStrategy : public ACLStrategy<char const *>
  20 {
  21
  22 public:
  23     virtual int match (ACLData<char const *> * &, ACLFilledChecklist *, ACLFlags &);
  24     virtual bool requiresRequest() const {return true;}
  25
  26     static ACLRequestHeaderStrategy *Instance();
  27     /* Not implemented to prevent copies of the instance. */
  28     /* Not private to prevent brain dead g+++ warnings about
  29      * private constructors with no friends */
  30     ACLRequestHeaderStrategy(ACLRequestHeaderStrategy const &);
  31
  32 private:
  33     static ACLRequestHeaderStrategy *Instance_;
  34     ACLRequestHeaderStrategy() {}
  35
  36     ACLRequestHeaderStrategy&operator=(ACLRequestHeaderStrategy const &);
  37 };
  38
  39 template <http_hdr_type header>
  40 int
  41 ACLRequestHeaderStrategy<header>::match (ACLData<char const *> * &data, ACLFilledChecklist *checklist, ACLFlags &)
  42 {
  43     char const *theHeader = checklist->request->header.getStr(header);
  44
  45     if (NULL == theHeader)
  46         return 0;
  47
  48     return data->match(theHeader);
  49 }
  50
  51 template <http_hdr_type header>
  52 ACLRequestHeaderStrategy<header> *
  53 ACLRequestHeaderStrategy<header>::Instance()
  54 {
  55     if (!Instance_)
  56         Instance_ = new ACLRequestHeaderStrategy<header>;
  57
  58     return Instance_;
  59 }
  60
  61 template <http_hdr_type header>
  62 ACLRequestHeaderStrategy<header> * ACLRequestHeaderStrategy<header>::Instance_ = NULL;
  63
  64 #endif /* SQUID_REQUESTHEADERSTRATEGY_H */
  65