distributed.camp
A Python port of the Invisible Internet Project (I2P)
1"""Build time sanity checks — earliest/latest reasonable system clock values.
2
3Ported from net.i2p.time.BuildTime.
4"""
5
6import time
7from datetime import datetime, timezone
8
9
10# Hardcoded earliest reasonable time (update periodically)
11_EARLIEST_STR = "2025-05-26 12:00:00"
12_EARLIEST_LONG_MS = 1748217600 * 1000 # fallback if parse fails
13_YEARS_25_MS = 25 * 365 * 24 * 60 * 60 * 1000
14
15
16def _parse_earliest() -> int:
17 """Parse the earliest reasonable time string, return ms since epoch."""
18 try:
19 dt = datetime.strptime(_EARLIEST_STR, "%Y-%m-%d %H:%M:%S").replace(
20 tzinfo=timezone.utc
21 )
22 return int(dt.timestamp() * 1000)
23 except (ValueError, OverflowError):
24 return _EARLIEST_LONG_MS
25
26
27_earliest_time = _parse_earliest()
28_latest_time = _earliest_time + _YEARS_25_MS
29# In Python context, we don't read JAR manifests — build time = earliest
30_build_time = _earliest_time
31
32
33class BuildTime:
34 """Get build date sanity bounds for clock validation.
35
36 In the Python port, we don't read JAR manifests, so build_time
37 defaults to the hardcoded earliest time.
38 """
39
40 @staticmethod
41 def get_build_time() -> int:
42 """Return build time in milliseconds since epoch."""
43 return _build_time
44
45 @staticmethod
46 def get_earliest_time() -> int:
47 """Return the earliest reasonable time in ms since epoch."""
48 return _earliest_time
49
50 @staticmethod
51 def get_latest_time() -> int:
52 """Return the latest reasonable time in ms since epoch."""
53 return _latest_time