Yingdi Yu | 48e8c0c | 2014-03-19 12:01:55 -0700 | [diff] [blame] | 1 | /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */ |
| 2 | /** |
| 3 | * Copyright (C) 2013 Regents of the University of California. |
| 4 | * @author: Yingdi Yu <yingdi@cs.ucla.edu> |
| 5 | * See COPYING for copyright and distribution information. |
| 6 | */ |
| 7 | |
| 8 | #ifndef NDN_SECURITY_CONF_FILTER_HPP |
| 9 | #define NDN_SECURITY_CONF_FILTER_HPP |
| 10 | |
| 11 | #include "../../common.hpp" |
| 12 | #include "../../data.hpp" |
| 13 | #include "../../interest.hpp" |
| 14 | #include "../../util/regex.hpp" |
| 15 | #include <boost/algorithm/string.hpp> |
| 16 | |
| 17 | #include "common.hpp" |
| 18 | |
| 19 | namespace ndn { |
| 20 | namespace security { |
| 21 | namespace conf { |
| 22 | |
| 23 | class Filter |
| 24 | { |
| 25 | public: |
| 26 | virtual |
| 27 | ~Filter() |
| 28 | { |
| 29 | } |
| 30 | |
| 31 | virtual bool |
| 32 | match(const Data& data) = 0; |
| 33 | |
| 34 | virtual bool |
| 35 | match(const Interest& interest) = 0; |
| 36 | }; |
| 37 | |
| 38 | class RelationNameFilter : public Filter |
| 39 | { |
| 40 | public: |
| 41 | enum Relation |
| 42 | { |
| 43 | RELATION_EQUAL, |
| 44 | RELATION_IS_PREFIX_OF, |
| 45 | RELATION_IS_STRICT_PREFIX_OF, |
| 46 | }; |
| 47 | |
| 48 | RelationNameFilter(const Name& name, Relation relation) |
| 49 | : m_name(name) |
| 50 | , m_relation(relation) |
| 51 | { |
| 52 | } |
| 53 | |
| 54 | virtual |
| 55 | ~RelationNameFilter() |
| 56 | { |
| 57 | } |
| 58 | |
| 59 | virtual bool |
| 60 | match(const Data& data) |
| 61 | { |
| 62 | return match(data.getName()); |
| 63 | } |
| 64 | |
| 65 | virtual bool |
| 66 | match(const Interest& interest) |
| 67 | { |
| 68 | if (interest.getName().size() < 2) |
| 69 | return false; |
| 70 | |
| 71 | Name signedName = interest.getName().getPrefix(-2); |
| 72 | return match(signedName); |
| 73 | } |
| 74 | |
| 75 | private: |
| 76 | bool |
| 77 | match(const Name& name) |
| 78 | { |
| 79 | switch (m_relation) |
| 80 | { |
| 81 | case RELATION_EQUAL: |
| 82 | return (name == m_name); |
| 83 | case RELATION_IS_PREFIX_OF: |
| 84 | return m_name.isPrefixOf(name); |
| 85 | case RELATION_IS_STRICT_PREFIX_OF: |
| 86 | return (m_name.isPrefixOf(name) && m_name != name); |
| 87 | default: |
| 88 | return false; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | private: |
| 93 | Name m_name; |
| 94 | Relation m_relation; |
| 95 | }; |
| 96 | |
| 97 | class RegexNameFilter : public Filter |
| 98 | { |
| 99 | public: |
| 100 | explicit |
| 101 | RegexNameFilter(const Regex& regex) |
| 102 | : m_regex(regex) |
| 103 | { |
| 104 | } |
| 105 | |
| 106 | virtual |
| 107 | ~RegexNameFilter() |
| 108 | { |
| 109 | } |
| 110 | |
| 111 | virtual bool |
| 112 | match(const Data& data) |
| 113 | { |
| 114 | return m_regex.match(data.getName()); |
| 115 | } |
| 116 | |
| 117 | virtual bool |
| 118 | match(const Interest& interest) |
| 119 | { |
| 120 | if (interest.getName().size() < 2) |
| 121 | return false; |
| 122 | |
| 123 | Name signedName = interest.getName().getPrefix(-2); |
| 124 | return m_regex.match(signedName); |
| 125 | } |
| 126 | |
| 127 | private: |
| 128 | Regex m_regex; |
| 129 | }; |
| 130 | |
| 131 | class FilterFactory |
| 132 | { |
| 133 | public: |
| 134 | static shared_ptr<Filter> |
| 135 | create(const ConfigSection& configSection) |
| 136 | { |
| 137 | ConfigSection::const_iterator propertyIt = configSection.begin(); |
| 138 | |
| 139 | if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first, "type")) |
| 140 | throw Error("Expect <filter.type>!"); |
| 141 | |
| 142 | std::string type = propertyIt->second.data(); |
| 143 | |
| 144 | if (boost::iequals(type, "name")) |
| 145 | return createNameFilter(configSection); |
| 146 | else |
| 147 | throw Error("Unsupported filter.type: " + type); |
| 148 | } |
| 149 | private: |
| 150 | static shared_ptr<Filter> |
| 151 | createNameFilter(const ConfigSection& configSection) |
| 152 | { |
| 153 | ConfigSection::const_iterator propertyIt = configSection.begin(); |
| 154 | propertyIt++; |
| 155 | |
| 156 | if (propertyIt == configSection.end()) |
| 157 | throw Error("Expect more properties for filter(name)"); |
| 158 | |
| 159 | if (boost::iequals(propertyIt->first, "name")) |
| 160 | { |
| 161 | // Get filter.name |
| 162 | Name name; |
| 163 | try |
| 164 | { |
| 165 | name = Name(propertyIt->second.data()); |
| 166 | } |
| 167 | catch (Name::Error& e) |
| 168 | { |
| 169 | throw Error("Wrong filter.name: " + propertyIt->second.data()); |
| 170 | } |
| 171 | |
| 172 | propertyIt++; |
| 173 | |
| 174 | // Get filter.relation |
| 175 | if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first, "relation")) |
| 176 | throw Error("Expect <filter.relation>!"); |
| 177 | |
| 178 | std::string relationString = propertyIt->second.data(); |
| 179 | propertyIt++; |
| 180 | |
| 181 | RelationNameFilter::Relation relation; |
| 182 | if (boost::iequals(relationString, "equal")) |
| 183 | relation = RelationNameFilter::RELATION_EQUAL; |
| 184 | else if (boost::iequals(relationString, "is-prefix-of")) |
| 185 | relation = RelationNameFilter::RELATION_IS_PREFIX_OF; |
| 186 | else if (boost::iequals(relationString, "is-strict-prefix-of")) |
| 187 | relation = RelationNameFilter::RELATION_IS_STRICT_PREFIX_OF; |
| 188 | else |
| 189 | throw Error("Unsupported relation: " + relationString); |
| 190 | |
| 191 | |
| 192 | if (propertyIt != configSection.end()) |
| 193 | throw Error("Expect the end of filter!"); |
| 194 | |
| 195 | return make_shared<RelationNameFilter>(boost::cref(name), |
| 196 | boost::cref(relation)); |
| 197 | } |
| 198 | else if (boost::iequals(propertyIt->first, "regex")) |
| 199 | { |
| 200 | std::string regexString = propertyIt->second.data(); |
| 201 | propertyIt++; |
| 202 | |
| 203 | if (propertyIt != configSection.end()) |
| 204 | throw Error("Expect the end of filter!"); |
| 205 | |
| 206 | try |
| 207 | { |
| 208 | return shared_ptr<RegexNameFilter>(new RegexNameFilter(regexString)); |
| 209 | } |
| 210 | catch (const Regex::Error& e) |
| 211 | { |
| 212 | throw Error("Wrong filter.regex: " + regexString); |
| 213 | } |
| 214 | } |
| 215 | else |
| 216 | throw Error("Wrong filter(name) properties"); |
| 217 | } |
| 218 | }; |
| 219 | |
| 220 | } // namespace conf |
| 221 | } // namespace security |
| 222 | } // namespace ndn |
| 223 | |
| 224 | #endif // NDN_SECURITY_CONF_FILTER_HPP |