Move class HttpDate to tdutils.

3 files changed, 128 insertions, 0 deletions

diff --git a/tdutils/CMakeLists.txt b/tdutils/CMakeLists.txt
index 1240682fc..f63bd90e5 100644
--- a/tdutils/CMakeLists.txt
+++ b/tdutils/CMakeLists.txt
@@ -107,6 +107,7 @@ set(TDUTILS_SOURCE
   td/utils/Gzip.cpp
   td/utils/GzipByteFlow.cpp
   td/utils/Hints.cpp
+  td/utils/HttpDate.cpp
   td/utils/HttpUrl.cpp
   td/utils/JsonBuilder.cpp
   td/utils/logging.cpp
@@ -231,6 +232,7 @@ set(TDUTILS_SOURCE
   td/utils/HazardPointers.h
   td/utils/Heap.h
   td/utils/Hints.h
+  td/utils/HttpDate.h
   td/utils/HttpUrl.h
   td/utils/int_types.h
   td/utils/invoke.h
diff --git a/tdutils/td/utils/HttpDate.cpp b/tdutils/td/utils/HttpDate.cpp
new file mode 100644
index 000000000..da290ae3a
--- /dev/null
+++ b/tdutils/td/utils/HttpDate.cpp
@@ -0,0 +1,92 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/utils/HttpDate.h"
+
+#include "td/utils/misc.h"
+#include "td/utils/Parser.h"
+#include "td/utils/Slice.h"
+
+namespace td {
+
+Result<int32> HttpDate::to_unix_time(int32 year, int32 month, int32 day, int32 hour, int32 minute, int32 second) {
+  if (year < 1970 || year > 2037) {
+    return Status::Error("Invalid year");
+  }
+  if (month < 1 || month > 12) {
+    return Status::Error("Invalid month");
+  }
+  if (day < 1 || day > days_in_month(year, month)) {
+    return Status::Error("Invalid day");
+  }
+  if (hour < 0 || hour >= 24) {
+    return Status::Error("Invalid hour");
+  }
+  if (minute < 0 || minute >= 60) {
+    return Status::Error("Invalid minute");
+  }
+  if (second < 0 || second > 60) {
+    return Status::Error("Invalid second");
+  }
+
+  int32 res = 0;
+  for (int32 y = 1970; y < year; y++) {
+    res += (is_leap(y) + 365) * seconds_in_day();
+  }
+  for (int32 m = 1; m < month; m++) {
+    res += days_in_month(year, m) * seconds_in_day();
+  }
+  res += (day - 1) * seconds_in_day();
+  res += hour * 60 * 60;
+  res += minute * 60;
+  res += second;
+  return res;
+}
+
+Result<int32> HttpDate::parse_http_date(string slice) {
+  Parser p(slice);
+  p.read_till(',');  // ignore week day
+  p.skip(',');
+  p.skip_whitespaces();
+  p.skip_nofail('0');
+  TRY_RESULT(day, to_integer_safe<int32>(p.read_word()));
+  auto month_name = p.read_word();
+  to_lower_inplace(month_name);
+  TRY_RESULT(year, to_integer_safe<int32>(p.read_word()));
+  p.skip_whitespaces();
+  p.skip_nofail('0');
+  TRY_RESULT(hour, to_integer_safe<int32>(p.read_till(':')));
+  p.skip(':');
+  p.skip_nofail('0');
+  TRY_RESULT(minute, to_integer_safe<int32>(p.read_till(':')));
+  p.skip(':');
+  p.skip_nofail('0');
+  TRY_RESULT(second, to_integer_safe<int32>(p.read_word()));
+  auto gmt = p.read_word();
+  TRY_STATUS(std::move(p.status()));
+  if (gmt != "GMT") {
+    return Status::Error("Timezone must be GMT");
+  }
+
+  static Slice month_names[12] = {"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"};
+
+  int month = 0;
+
+  for (int m = 1; m <= 12; m++) {
+    if (month_names[m - 1] == month_name) {
+      month = m;
+      break;
+    }
+  }
+
+  if (month == 0) {
+    return Status::Error("Unknown month name");
+  }
+
+  return to_unix_time(year, month, day, hour, minute, second);
+}
+
+}  // namespace td
diff --git a/tdutils/td/utils/HttpDate.h b/tdutils/td/utils/HttpDate.h
new file mode 100644
index 000000000..a2daf0784
--- /dev/null
+++ b/tdutils/td/utils/HttpDate.h
@@ -0,0 +1,34 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+#include "td/utils/common.h"
+#include "td/utils/Status.h"
+
+namespace td {
+
+class HttpDate {
+  static bool is_leap(int32 year) {
+    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
+  }
+
+  static int32 seconds_in_day() {
+    return 24 * 60 * 60;
+  }
+
+ public:
+  static int32 days_in_month(int32 year, int32 month) {
+    static int cnt[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+    return cnt[month - 1] + (month == 2 && is_leap(year));
+  }
+
+  static Result<int32> to_unix_time(int32 year, int32 month, int32 day, int32 hour, int32 minute, int32 second);
+
+  static Result<int32> parse_http_date(string slice);
+};
+
+}  // namespace td