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Enhance HTTP date parsing with improved error handling and locale support

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This commit is contained in:
yhirose
2025-12-04 23:45:33 -05:00
parent 8d6123c126
commit d934f569cb
1 changed files with 23 additions and 11 deletions
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34
httplib.h
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@@ -2999,19 +2999,31 @@ inline std::string file_mtime_to_http_date(time_t mtime) {
// Parse HTTP-date (RFC 7231) to time_t. Returns -1 on failure.
inline time_t parse_http_date(const std::string &date_str) {
struct tm tm_buf;
memset(&tm_buf, 0, sizeof(tm_buf));
// Try RFC 7231 preferred format: "Sun, 06 Nov 1994 08:49:37 GMT"
const char *p = strptime(date_str.c_str(), "%a, %d %b %Y %H:%M:%S", &tm_buf);
if (!p) {
// Try RFC 850 format: "Sunday, 06-Nov-94 08:49:37 GMT"
p = strptime(date_str.c_str(), "%A, %d-%b-%y %H:%M:%S", &tm_buf);
// Create a classic locale object once for all parsing attempts
const std::locale classic_locale = std::locale::classic();
// Try to parse using std::get_time (C++11, cross-platform)
auto try_parse = [&](const char *fmt) -> bool {
std::istringstream ss(date_str);
ss.imbue(classic_locale);
memset(&tm_buf, 0, sizeof(tm_buf));
ss >> std::get_time(&tm_buf, fmt);
return !ss.fail();
};
// RFC 7231 preferred format: "Sun, 06 Nov 1994 08:49:37 GMT"
if (!try_parse("%a, %d %b %Y %H:%M:%S")) {
// RFC 850 format: "Sunday, 06-Nov-94 08:49:37 GMT"
if (!try_parse("%A, %d-%b-%y %H:%M:%S")) {
// asctime format: "Sun Nov 6 08:49:37 1994"
if (!try_parse("%a %b %d %H:%M:%S %Y")) {
return static_cast<time_t>(-1);
}
}
}
if (!p) {
// Try asctime format: "Sun Nov 6 08:49:37 1994"
p = strptime(date_str.c_str(), "%a %b %d %H:%M:%S %Y", &tm_buf);
}
if (!p) { return static_cast<time_t>(-1); }
#ifdef _WIN32
return _mkgmtime(&tm_buf);