niko
75 lines
3.5 KiB
C#
75 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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using Campus_live_rewrite.api.server.Classes;
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namespace Campus_live_rewrite.api.server
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{
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/// <summary>
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/// Rate limit on POST /api/gamerewards/v1/request - the whole request, not just the reward
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/// box it may offer.
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///
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/// The client asks for a reward twice around the end of a game: rewardType=PostGameActivity
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/// (the game complete) and, once a day, rewardType=FirstActivityOfDay. Before this the
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/// currency and XP were paid on EVERY PostGameActivity - only the three-choice box sat behind
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/// a cooldown - so a client replaying the call farmed tokens and levels.
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///
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/// The rule:
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/// - FirstActivityOfDay is once per day (PlayerDB.TryClaimDailyReward, unchanged) and is
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/// always let through when it is the day's first.
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/// - PostGameActivity is at most ONE per ConfigCampus.GameRewardCompleteCooldownSeconds per
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/// player ... EXCEPT when the player's daily FirstActivityOfDay was accepted within the
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/// last GameRewardDailyGraceSeconds: the two arrive together at the end of the day's
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/// first game, and that game complete must not be eaten by a cooldown the previous game
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/// started. The grace is consumed by the one game complete it lets through.
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/// A refused request is answered null (nothing offered) and pays nothing.
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/// </summary>
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public static class GameRewardGate
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{
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private static readonly object _lock = new();
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private static readonly Dictionary<ulong, DateTime> _lastComplete = new();
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private static readonly Dictionary<ulong, DateTime> _dailyGrace = new();
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/// <summary>Call when a FirstActivityOfDay claim was ACCEPTED (it was the day's first).</summary>
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public static void NoteDailyAccepted(ulong playerId)
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{
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lock (_lock) _dailyGrace[playerId] = DateTime.UtcNow;
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}
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/// <summary>
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/// Whether a PostGameActivity may be paid now. Marks the clock when it may.
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/// <paramref name="why"/> explains a refusal.
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/// </summary>
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public static bool TryGameComplete(ulong playerId, out string why)
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{
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why = "";
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int cd = ConfigCampus.GameRewardCompleteCooldownSeconds;
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var now = DateTime.UtcNow;
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lock (_lock)
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{
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bool graced = _dailyGrace.TryGetValue(playerId, out var daily)
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&& (now - daily).TotalSeconds <= ConfigCampus.GameRewardDailyGraceSeconds;
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if (graced)
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{
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_dailyGrace.Remove(playerId); // one game complete rides on the daily bonus
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_lastComplete[playerId] = now;
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return true;
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}
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if (cd > 0 && _lastComplete.TryGetValue(playerId, out var last) && (now - last).TotalSeconds < cd)
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{
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why = $"game complete {Math.Round((now - last).TotalSeconds)}s after the last one (limit one per {cd}s)";
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return false;
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}
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_lastComplete[playerId] = now;
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return true;
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}
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}
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/// <summary>The gate for a request of <paramref name="type"/>; only game completes are limited here.</summary>
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public static bool Allow(ulong playerId, GameRewardType type, out string why)
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{
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why = "";
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return type != GameRewardType.PostGameActivity || TryGameComplete(playerId, out why);
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}
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}
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}
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