libs/http/src/server/fresh.cpp
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libs/http/src/server/fresh.cpp
| Line | Hits | Source Code |
|---|---|---|
| 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 |