. /src /server /fresh.cpp
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1   // 1   //
2   // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 4   // Distributed under the Boost Software License, Version 1.0. (See accompanying
5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/http 7   // Official repository: https://github.com/cppalliance/http
8   // 8   //
9   9  
10   #include <boost/http/server/fresh.hpp> 10   #include <boost/http/server/fresh.hpp>
11   #include <boost/http/field.hpp> 11   #include <boost/http/field.hpp>
12   12  
13   namespace boost { 13   namespace boost {
14   namespace http { 14   namespace http {
15   15  
16   namespace { 16   namespace {
17   17  
18   // Check if ETag matches If-None-Match 18   // Check if ETag matches If-None-Match
19   // Returns true if they match (response is fresh) 19   // Returns true if they match (response is fresh)
20   bool 20   bool
MISUBC 21   ✗ etag_matches( 21   ✗ etag_matches(
22   core::string_view if_none_match, 22   core::string_view if_none_match,
23   core::string_view etag ) noexcept 23   core::string_view etag ) noexcept
24   { 24   {
MISUBC 25   ✗ if( if_none_match.empty() || etag.empty() ) 25   ✗ if( if_none_match.empty() || etag.empty() )
MISUBC 26   ✗ return false; 26   ✗ return false;
27   27  
28   // "*" matches any ETag 28   // "*" matches any ETag
MISUBC 29   ✗ if( if_none_match == "*" ) 29   ✗ if( if_none_match == "*" )
MISUBC 30   ✗ return true; 30   ✗ return true;
31   31  
32   // Simple comparison - check if ETag appears in the list 32   // Simple comparison - check if ETag appears in the list
33   // In full implementation, would need to handle weak vs strong 33   // In full implementation, would need to handle weak vs strong
34   // and parse comma-separated list properly 34   // and parse comma-separated list properly
35   35  
36   // Remove W/ prefix for comparison if present 36   // Remove W/ prefix for comparison if present
MISUBC 37   ✗ auto strip_weak = []( core::string_view s ) -> core::string_view 37   ✗ auto strip_weak = []( core::string_view s ) -> core::string_view
38   { 38   {
MISUBC 39   ✗ if( s.size() >= 2 && 39   ✗ if( s.size() >= 2 &&
MISUBC 40   ✗ ( s[0] == 'W' || s[0] == 'w' ) && 40   ✗ ( s[0] == 'W' || s[0] == 'w' ) &&
MISUBC 41   ✗ s[1] == '/' ) 41   ✗ s[1] == '/' )
MISUBC 42   ✗ return s.substr( 2 ); 42   ✗ return s.substr( 2 );
MISUBC 43   ✗ return s; 43   ✗ return s;
44   }; 44   };
45   45  
MISUBC 46   ✗ auto const etag_val = strip_weak( etag ); 46   ✗ auto const etag_val = strip_weak( etag );
47   47  
48   // Simple contains check for the ETag value 48   // Simple contains check for the ETag value
MISUBC 49   ✗ auto pos = if_none_match.find( etag_val ); 49   ✗ auto pos = if_none_match.find( etag_val );
MISUBC 50   ✗ if( pos != core::string_view::npos ) 50   ✗ if( pos != core::string_view::npos )
MISUBC 51   ✗ return true; 51   ✗ return true;
52   52  
53   // Also check without weak prefix in if_none_match 53   // Also check without weak prefix in if_none_match
MISUBC 54   ✗ auto const inm_stripped = strip_weak( if_none_match ); 54   ✗ auto const inm_stripped = strip_weak( if_none_match );
MISUBC 55   ✗ if( inm_stripped == etag_val ) 55   ✗ if( inm_stripped == etag_val )
MISUBC 56   ✗ return true; 56   ✗ return true;
57   57  
MISUBC 58   ✗ return false; 58   ✗ return false;
59   } 59   }
60   60  
61   // Parse HTTP date and compare 61   // Parse HTTP date and compare
62   // Returns true if response's Last-Modified <= request's If-Modified-Since 62   // Returns true if response's Last-Modified <= request's If-Modified-Since
63   // For simplicity, doing string comparison (works for RFC 7231 dates) 63   // For simplicity, doing string comparison (works for RFC 7231 dates)
64   bool 64   bool
MISUBC 65   ✗ not_modified_since( 65   ✗ not_modified_since(
66   core::string_view if_modified_since, 66   core::string_view if_modified_since,
67   core::string_view last_modified ) noexcept 67   core::string_view last_modified ) noexcept
68   { 68   {
MISUBC 69   ✗ if( if_modified_since.empty() || last_modified.empty() ) 69   ✗ if( if_modified_since.empty() || last_modified.empty() )
MISUBC 70   ✗ return false; 70   ✗ return false;
71   71  
72   // HTTP dates in RFC 7231 format are lexicographically comparable 72   // HTTP dates in RFC 7231 format are lexicographically comparable
73   // when in the same format (preferred format) 73   // when in the same format (preferred format)
74   // For a robust implementation, would parse dates properly 74   // For a robust implementation, would parse dates properly
MISUBC 75   ✗ return last_modified <= if_modified_since; 75   ✗ return last_modified <= if_modified_since;
76   } 76   }
77   77  
78   } // (anon) 78   } // (anon)
79   79  
80   bool 80   bool
HITCBC 81   1 is_fresh( 81   1 is_fresh(
82   request const& req, 82   request const& req,
83   response const& res ) noexcept 83   response const& res ) noexcept
84   { 84   {
85   // Get conditional request headers 85   // Get conditional request headers
HITCBC 86   1 auto const if_none_match = req.value_or( 86   1 auto const if_none_match = req.value_or(
87   field::if_none_match, "" ); 87   field::if_none_match, "" );
HITCBC 88   1 auto const if_modified_since = req.value_or( 88   1 auto const if_modified_since = req.value_or(
89   field::if_modified_since, "" ); 89   field::if_modified_since, "" );
90   90  
91   // If no conditional headers, not fresh 91   // If no conditional headers, not fresh
HITCBC 92   1 if( if_none_match.empty() && if_modified_since.empty() ) 92   1 if( if_none_match.empty() && if_modified_since.empty() )
HITCBC 93   1 return false; 93   1 return false;
94   94  
95   // Get response caching headers 95   // Get response caching headers
MISUBC 96   ✗ auto const etag = res.value_or( field::etag, "" ); 96   ✗ auto const etag = res.value_or( field::etag, "" );
MISUBC 97   ✗ auto const last_modified = res.value_or( 97   ✗ auto const last_modified = res.value_or(
98   field::last_modified, "" ); 98   field::last_modified, "" );
99   99  
100   // Check ETag first (stronger validator) 100   // Check ETag first (stronger validator)
MISUBC 101   ✗ if( ! if_none_match.empty() ) 101   ✗ if( ! if_none_match.empty() )
102   { 102   {
MISUBC 103   ✗ if( ! etag.empty() && etag_matches( if_none_match, etag ) ) 103   ✗ if( ! etag.empty() && etag_matches( if_none_match, etag ) )
MISUBC 104   ✗ return true; 104   ✗ return true;
105   // If If-None-Match present but doesn't match, not fresh 105   // If If-None-Match present but doesn't match, not fresh
MISUBC 106   ✗ return false; 106   ✗ return false;
107   } 107   }
108   108  
109   // Fall back to If-Modified-Since 109   // Fall back to If-Modified-Since
MISUBC 110   ✗ if( ! if_modified_since.empty() && ! last_modified.empty() ) 110   ✗ if( ! if_modified_since.empty() && ! last_modified.empty() )
111   { 111   {
MISUBC 112   ✗ return not_modified_since( if_modified_since, last_modified ); 112   ✗ return not_modified_since( if_modified_since, last_modified );
113   } 113   }
114   114  
MISUBC 115   ✗ return false; 115   ✗ return false;
116   } 116   }
117   117  
118   } // http 118   } // http
119   } // boost 119   } // boost