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Refactor ETag handling: use 'auto' for type inference and improve code readability

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yhirose
2025-12-05 12:42:46 -05:00
parent c5dfb1019c
commit 42e762ddd6
1 changed files with 23 additions and 19 deletions
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42
httplib.h
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@@ -2976,8 +2976,8 @@ inline std::string from_i_to_hex(size_t n) {
inline std::string compute_etag(const FileStat &fs) {
if (!fs.is_file()) { return std::string(); }
time_t mtime_raw = fs.mtime();
size_t mtime = mtime_raw < 0 ? 0 : static_cast<size_t>(mtime_raw);
auto mtime_raw = fs.mtime();
auto mtime = mtime_raw < 0 ? 0 : static_cast<size_t>(mtime_raw);
auto size = fs.size();
return std::string("W/\"") + from_i_to_hex(mtime) + "-" +
@@ -8359,10 +8359,11 @@ inline bool Server::handle_file_request(Request &req, Response &res) {
// Compute and set weak ETag based on mtime+size.
auto etag = detail::compute_etag(stat);
auto mtime = stat.mtime();
auto last_modified = detail::file_mtime_to_http_date(mtime);
if (!etag.empty()) { res.set_header("ETag", etag); }
auto mtime = stat.mtime();
auto last_modified = detail::file_mtime_to_http_date(mtime);
if (!last_modified.empty()) {
res.set_header("Last-Modified", last_modified);
}
@@ -8372,15 +8373,16 @@ inline bool Server::handle_file_request(Request &req, Response &res) {
// 2. If-Modified-Since is checked only when If-None-Match is absent
if (req.has_header("If-None-Match")) {
if (!etag.empty()) {
auto inm = req.get_header_value("If-None-Match");
bool matched = false;
auto val = req.get_header_value("If-None-Match");
auto matched = false;
// NOTE: We use exact string matching here. This works correctly
// because our server always generates weak ETags (W/"..."), and
// clients typically send back the same ETag they received.
// RFC 9110 Section 8.8.3.2 allows weak comparison for
// If-None-Match, where W/"x" and "x" would match, but this
// simplified implementation requires exact matches.
detail::split(inm.data(), inm.data() + inm.size(), ',',
detail::split(val.data(), val.data() + val.size(), ',',
[&](const char *b, const char *e) {
if (!matched) {
auto tag = std::string(b, e);
@@ -8394,31 +8396,33 @@ inline bool Server::handle_file_request(Request &req, Response &res) {
}
}
} else if (req.has_header("If-Modified-Since")) {
auto ims = req.get_header_value("If-Modified-Since");
auto ims_time = detail::parse_http_date(ims);
if (ims_time != static_cast<time_t>(-1) && mtime <= ims_time) {
auto val = req.get_header_value("If-Modified-Since");
auto t = detail::parse_http_date(val);
if (t != static_cast<time_t>(-1) && mtime <= t) {
res.status = StatusCode::NotModified_304;
return true;
}
}
// Handle If-Range for partial content requests (RFC 9110 Section 13.1.5).
// If-Range is only evaluated when Range header is present.
// If the validator matches, serve partial content; otherwise serve full content.
// Handle If-Range for partial content requests (RFC 9110
// Section 13.1.5). If-Range is only evaluated when Range header is
// present. If the validator matches, serve partial content; otherwise
// serve full content.
if (!req.ranges.empty() && req.has_header("If-Range")) {
auto if_range = req.get_header_value("If-Range");
auto val = req.get_header_value("If-Range");
auto valid = false;
if (detail::is_strong_etag(if_range)) {
if (detail::is_strong_etag(val)) {
// RFC 9110 Section 13.1.5: If-Range requires strong ETag
// comparison.
valid = (!etag.empty() && if_range == etag);
} else if (detail::is_weak_etag(if_range)) {
valid = (!etag.empty() && val == etag);
} else if (detail::is_weak_etag(val)) {
// Weak ETags are not valid for If-Range (RFC 9110 Section 13.1.5)
valid = false;
} else {
// HTTP-date comparison
auto if_range_time = detail::parse_http_date(if_range);
auto if_range_time = detail::parse_http_date(val);
valid = (if_range_time != static_cast<time_t>(-1) &&
mtime <= if_range_time);
}