| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 Vinnie Falco (vinnie dot falco at gmail dot com) | ||
| 3 | // | ||
| 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) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/http | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/http/server/fresh.hpp> | ||
| 11 | #include <boost/http/field.hpp> | ||
| 12 | |||
| 13 | namespace boost { | ||
| 14 | namespace http { | ||
| 15 | |||
| 16 | namespace { | ||
| 17 | |||
| 18 | // Check if ETag matches If-None-Match | ||
| 19 | // Returns true if they match (response is fresh) | ||
| 20 | bool | ||
| 21 | ✗ | etag_matches( | |
| 22 | core::string_view if_none_match, | ||
| 23 | core::string_view etag ) noexcept | ||
| 24 | { | ||
| 25 | ✗ | if( if_none_match.empty() || etag.empty() ) | |
| 26 | ✗ | return false; | |
| 27 | |||
| 28 | // "*" matches any ETag | ||
| 29 | ✗ | if( if_none_match == "*" ) | |
| 30 | ✗ | return true; | |
| 31 | |||
| 32 | // Simple comparison - check if ETag appears in the list | ||
| 33 | // In full implementation, would need to handle weak vs strong | ||
| 34 | // and parse comma-separated list properly | ||
| 35 | |||
| 36 | // Remove W/ prefix for comparison if present | ||
| 37 | ✗ | auto strip_weak = []( core::string_view s ) -> core::string_view | |
| 38 | { | ||
| 39 | ✗ | if( s.size() >= 2 && | |
| 40 | ✗ | ( s[0] == 'W' || s[0] == 'w' ) && | |
| 41 | ✗ | s[1] == '/' ) | |
| 42 | ✗ | return s.substr( 2 ); | |
| 43 | ✗ | return s; | |
| 44 | }; | ||
| 45 | |||
| 46 | ✗ | auto const etag_val = strip_weak( etag ); | |
| 47 | |||
| 48 | // Simple contains check for the ETag value | ||
| 49 | ✗ | auto pos = if_none_match.find( etag_val ); | |
| 50 | ✗ | if( pos != core::string_view::npos ) | |
| 51 | ✗ | return true; | |
| 52 | |||
| 53 | // Also check without weak prefix in if_none_match | ||
| 54 | ✗ | auto const inm_stripped = strip_weak( if_none_match ); | |
| 55 | ✗ | if( inm_stripped == etag_val ) | |
| 56 | ✗ | return true; | |
| 57 | |||
| 58 | ✗ | return false; | |
| 59 | } | ||
| 60 | |||
| 61 | // Parse HTTP date and compare | ||
| 62 | // Returns true if response's Last-Modified <= request's If-Modified-Since | ||
| 63 | // For simplicity, doing string comparison (works for RFC 7231 dates) | ||
| 64 | bool | ||
| 65 | ✗ | not_modified_since( | |
| 66 | core::string_view if_modified_since, | ||
| 67 | core::string_view last_modified ) noexcept | ||
| 68 | { | ||
| 69 | ✗ | if( if_modified_since.empty() || last_modified.empty() ) | |
| 70 | ✗ | return false; | |
| 71 | |||
| 72 | // HTTP dates in RFC 7231 format are lexicographically comparable | ||
| 73 | // when in the same format (preferred format) | ||
| 74 | // For a robust implementation, would parse dates properly | ||
| 75 | ✗ | return last_modified <= if_modified_since; | |
| 76 | } | ||
| 77 | |||
| 78 | } // (anon) | ||
| 79 | |||
| 80 | bool | ||
| 81 | ✗ | is_fresh( | |
| 82 | request const& req, | ||
| 83 | response const& res ) noexcept | ||
| 84 | { | ||
| 85 | // Get conditional request headers | ||
| 86 | ✗ | auto const if_none_match = req.value_or( | |
| 87 | field::if_none_match, "" ); | ||
| 88 | ✗ | auto const if_modified_since = req.value_or( | |
| 89 | field::if_modified_since, "" ); | ||
| 90 | |||
| 91 | // If no conditional headers, not fresh | ||
| 92 | ✗ | if( if_none_match.empty() && if_modified_since.empty() ) | |
| 93 | ✗ | return false; | |
| 94 | |||
| 95 | // Get response caching headers | ||
| 96 | ✗ | auto const etag = res.value_or( field::etag, "" ); | |
| 97 | ✗ | auto const last_modified = res.value_or( | |
| 98 | field::last_modified, "" ); | ||
| 99 | |||
| 100 | // Check ETag first (stronger validator) | ||
| 101 | ✗ | if( ! if_none_match.empty() ) | |
| 102 | { | ||
| 103 | ✗ | if( ! etag.empty() && etag_matches( if_none_match, etag ) ) | |
| 104 | ✗ | return true; | |
| 105 | // If If-None-Match present but doesn't match, not fresh | ||
| 106 | ✗ | return false; | |
| 107 | } | ||
| 108 | |||
| 109 | // Fall back to If-Modified-Since | ||
| 110 | ✗ | if( ! if_modified_since.empty() && ! last_modified.empty() ) | |
| 111 | { | ||
| 112 | ✗ | return not_modified_since( if_modified_since, last_modified ); | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | return false; | |
| 116 | } | ||
| 117 | |||
| 118 | } // http | ||
| 119 | } // boost | ||
| 120 |