feat: add TRPG roll command

docs/permsys.md

@@ -16,6 +16,7 @@
 - `konabot/common/permsys/__init__.py`
   - 暴露 `PermManager`、`DepPermManager`、`require_permission`
   - 负责数据库初始化、启动迁移、超级管理员默认授权
+  - 提供 `register_default_allow_permission()` 用于注册“启动时默认放行”的权限键
 - `konabot/common/permsys/entity.py`
   - 定义 `PermEntity`
   - 将事件转换为可查询的实体链
@@ -134,6 +135,14 @@ PermEntity("ob11", "user", str(account)), "*", True
 
 也就是说，配置中的超级管理员会直接拥有全部权限。
 
+此外，模块也支持插件在导入阶段通过 `register_default_allow_permission("some.key")` 注册默认放行的权限键；这些键会在启动时被写入到：
+
+```python
+PermEntity("sys", "global", "global"), "some.key", True
+```
+
+这适合“默认所有人可用，但仍希望后续能被权限系统单独关闭”的功能。
+
 这属于启动时自动灌入的保底策略，不依赖手工授权命令。
 
 ## 在插件中使用

konabot/common/permsys/__init__.py

@@ -14,6 +14,7 @@ from konabot.common.permsys.repo import PermRepo
 
 
 db = DatabaseManager(DATA_PATH / "perm.sqlite3")
+_default_allow_permissions: set[str] = set()
 
 
 _EntityLike = Event | PermEntity | list[PermEntity]
@@ -91,6 +92,10 @@ def create_startup():  # pragma: no cover
                 await pm.update_permission(
                     PermEntity("ob11", "user", str(account)), "*", True
                 )
+            for key in _default_allow_permissions:
+                await pm.update_permission(
+                    PermEntity("sys", "global", "global"), key, True
+                )
 
     @driver.on_shutdown
     async def _():
@@ -103,6 +108,10 @@ def create_startup():  # pragma: no cover
 DepPermManager = Annotated[PermManager, Depends(perm_manager)]
 
 
+def register_default_allow_permission(key: str):
+    _default_allow_permissions.add(key)
+
+
 def require_permission(perm: str) -> Rule:  # pragma: no cover
     async def check_permission(event: Event, pm: DepPermManager) -> bool:
         return await pm.check_has_permission(event, perm)

konabot/docs/user/roll.txt

@@ -0,0 +1,53 @@
+**roll** - 面向跑团的文本骰子指令
+
+## 用法
+
+`roll 表达式`
+
+支持常见骰子写法：
+
+- `roll 3d6`
+- `roll d20+5`
+- `roll 2d8+1d4+3`
+- `roll d%`
+- `roll 4dF`
+
+## 说明
+
+- `NdM` 表示掷 N 个 M 面骰，例如 `3d6`
+- `d20` 等价于 `1d20`
+- `d%` 表示百分骰，范围 1 到 100
+- `dF` 表示 Fate/Fudge 骰，单骰结果为 -1、0、+1
+- 支持用 `+`、`-` 连接多个项，也支持常数修正
+
+## 返回格式
+
+会返回总结果，以及每一项的明细。
+
+例如：
+
+- `roll 3d6`
+  可能返回：
+  - `3d6 = 11`
+  - `+3d6=[2, 4, 5]`
+
+- `roll d20+5`
+  可能返回：
+  - `d20+5 = 19`
+  - `+1d20=[14] +5=5`
+
+## 限制
+
+为防止刷屏和滥用，当前实现会限制：
+
+- 单项最多 100 个骰子
+- 单个骰子最多 1000 面
+- 一次表达式最多 20 项
+- 一次表达式最多实际掷 200 个骰子
+- 结果过长时会直接拒绝
+
+## 权限
+
+需要 `trpg.roll` 权限。
+
+默认启动时会给系统全局授予允许，因此通常所有人都能用；如有需要可再用权限系统单独关闭。

konabot/plugins/trpg_roll/__init__.py

@@ -0,0 +1,35 @@
+import nonebot
+from nonebot.adapters import Event
+from nonebot_plugin_alconna import UniMessage, UniMsg
+
+from konabot.common.permsys import register_default_allow_permission, require_permission
+from konabot.plugins.trpg_roll.core import RollError, roll_expression
+
+
+PERMISSION_KEY = "trpg.roll"
+register_default_allow_permission(PERMISSION_KEY)
+
+
+matcher = nonebot.on_message(
+    rule=require_permission(PERMISSION_KEY),
+)
+
+
+@matcher.handle()
+async def _(event: Event, msg: UniMsg):
+    text = msg.extract_plain_text().strip()
+    lowered = text.lower()
+    if lowered == "roll" or lowered.startswith("roll "):
+        expr = text[4:].strip()
+    else:
+        return
+
+    if not expr:
+        await UniMessage.text("用法：roll 3d6 / roll d20+5 / roll 2d8+1d4+3 / roll 4dF").send(event)
+        return
+
+    try:
+        result = roll_expression(expr)
+        await UniMessage.text(result.format()).send(event)
+    except RollError as e:
+        await UniMessage.text(str(e)).send(event)

konabot/plugins/trpg_roll/core.py

@@ -0,0 +1,143 @@
+import random
+import re
+from dataclasses import dataclass
+
+
+MAX_DICE_COUNT = 100
+MAX_DICE_FACES = 1000
+MAX_TERM_COUNT = 20
+MAX_TOTAL_ROLLS = 200
+MAX_EXPRESSION_LENGTH = 200
+MAX_MESSAGE_LENGTH = 1200
+
+_TOKEN_RE = re.compile(r"([+-]?)(\d*d(?:%|[fF]|\d+)|\d+)")
+_DICE_RE = re.compile(r"(?i)(\d*)d(%|f|\d+)")
+
+# 常见跑团表达式示例：3d6、d20+5、2d8+1d4+3、d%、4dF
+
+
+class RollError(ValueError):
+    pass
+
+
+@dataclass(slots=True)
+class RollTermResult:
+    sign: int
+    source: str
+    detail: str
+    value: int
+
+
+@dataclass(slots=True)
+class RollResult:
+    expression: str
+    total: int
+    terms: list[RollTermResult]
+
+    def format(self) -> str:
+        parts = [f"{term.source}={term.detail}" for term in self.terms]
+        detail = " ".join(parts)
+        text = f"{self.expression} = {self.total}"
+        if detail:
+            text += f"\n{detail}"
+        if len(text) > MAX_MESSAGE_LENGTH:
+            raise RollError("结果过长，请减少骰子数量或简化表达式")
+        return text
+
+
+def _parse_single_term(raw: str, sign: int, rng: random.Random) -> RollTermResult:
+    dice_match = _DICE_RE.fullmatch(raw)
+    if dice_match:
+        count_text, faces_text = dice_match.groups()
+        count = int(count_text) if count_text else 1
+        if count <= 0:
+            raise RollError("骰子个数必须大于 0")
+        if count > MAX_DICE_COUNT:
+            raise RollError(f"单项最多只能掷 {MAX_DICE_COUNT} 个骰子")
+
+        if faces_text == "%":
+            faces = 100
+            rolls = [rng.randint(1, 100) for _ in range(count)]
+        elif faces_text.lower() == "f":
+            rolls = [rng.choice((-1, 0, 1)) for _ in range(count)]
+            total = sum(rolls) * sign
+            signed = "+" if sign > 0 else "-"
+            return RollTermResult(
+                sign=sign,
+                source=f"{signed}{count}dF",
+                detail="[" + ", ".join(f"{v:+d}" for v in rolls) + "]",
+                value=total,
+            )
+        else:
+            faces = int(faces_text)
+            if faces <= 0:
+                raise RollError("骰子面数必须大于 0")
+            if faces > MAX_DICE_FACES:
+                raise RollError(f"骰子面数不能超过 {MAX_DICE_FACES}")
+            rolls = [rng.randint(1, faces) for _ in range(count)]
+
+        total = sum(rolls) * sign
+        signed = "+" if sign > 0 else "-"
+        return RollTermResult(
+            sign=sign,
+            source=f"{signed}{count}d{faces_text.upper()}",
+            detail="[" + ", ".join(map(str, rolls)) + "]",
+            value=total,
+        )
+
+    value = int(raw) * sign
+    signed = "+" if sign > 0 else "-"
+    return RollTermResult(sign=sign, source=f"{signed}{raw}", detail=str(abs(value)), value=value)
+
+
+def roll_expression(expr: str, rng: random.Random | None = None) -> RollResult:
+    expr = expr.strip().replace(" ", "")
+    if not expr:
+        raise RollError("请提供要掷的表达式，例如 roll 3d6 或 roll d20+5")
+    if len(expr) > MAX_EXPRESSION_LENGTH:
+        raise RollError("表达式太长了")
+
+    matches = list(_TOKEN_RE.finditer(expr))
+    if not matches:
+        raise RollError("无法解析表达式，请使用如 3d6、d20+5、2d8+1d4+3、4dF 这样的格式")
+
+    rebuilt = "".join(m.group(0) for m in matches)
+    if rebuilt != expr:
+        raise RollError("表达式中含有无法识别的内容")
+    if len(matches) > MAX_TERM_COUNT:
+        raise RollError(f"表达式项数不能超过 {MAX_TERM_COUNT}")
+
+    total_rolls = 0
+    for m in matches:
+        token = m.group(2)
+        dice_match = _DICE_RE.fullmatch(token)
+        if dice_match:
+            count_text, faces_text = dice_match.groups()
+            count = int(count_text) if count_text else 1
+            if count <= 0:
+                raise RollError("骰子个数必须大于 0")
+            if count > MAX_DICE_COUNT:
+                raise RollError(f"单项最多只能掷 {MAX_DICE_COUNT} 个骰子")
+            if faces_text not in {"%", "f", "F"}:
+                faces = int(faces_text)
+                if faces <= 0:
+                    raise RollError("骰子面数必须大于 0")
+                if faces > MAX_DICE_FACES:
+                    raise RollError(f"骰子面数不能超过 {MAX_DICE_FACES}")
+            total_rolls += count
+    if total_rolls > MAX_TOTAL_ROLLS:
+        raise RollError(f"一次最多只能实际掷 {MAX_TOTAL_ROLLS} 个骰子")
+
+    rng = rng or random.Random()
+    terms: list[RollTermResult] = []
+    total = 0
+    for idx, match in enumerate(matches):
+        sign_text, raw = match.groups()
+        sign = -1 if sign_text == "-" else 1
+        if idx == 0 and sign_text == "":
+            sign = 1
+        term = _parse_single_term(raw, sign, rng)
+        terms.append(term)
+        total += term.value
+
+    return RollResult(expression=expr, total=total, terms=terms)

tests/test_permsys_default_allow.py

@@ -0,0 +1,40 @@
+from contextlib import asynccontextmanager
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pytest
+
+from konabot.common.database import DatabaseManager
+from konabot.common.permsys import PermManager, register_default_allow_permission
+from konabot.common.permsys.entity import PermEntity
+from konabot.common.permsys.migrates import execute_migration
+
+
+@asynccontextmanager
+async def tempdb():
+    with TemporaryDirectory() as _tempdir:
+        tempdir = Path(_tempdir)
+        db = DatabaseManager(tempdir / "perm.sqlite3")
+        yield db
+        await db.close_all_connections()
+
+
+@pytest.mark.asyncio
+async def test_register_default_allow_permission_records_key():
+    register_default_allow_permission("test.default.allow")
+
+    async with tempdb() as db:
+        async with db.get_conn() as conn:
+            await execute_migration(conn)
+
+        pm = PermManager(db)
+        await pm.update_permission(
+            PermEntity("sys", "global", "global"),
+            "test.default.allow",
+            True,
+        )
+
+        assert await pm.check_has_permission(
+            [PermEntity("dummy", "user", "1"), PermEntity("sys", "global", "global")],
+            "test.default.allow.sub",
+        )

tests/test_trpg_roll.py

@@ -0,0 +1,66 @@
+import random
+
+import pytest
+
+from konabot.plugins.trpg_roll.core import RollError, roll_expression
+
+
+class FakeRandom:
+    def __init__(self, randint_values: list[int] | None = None, choice_values: list[int] | None = None):
+        self._randint_values = list(randint_values or [])
+        self._choice_values = list(choice_values or [])
+
+    def randint(self, _a: int, _b: int) -> int:
+        assert self._randint_values
+        return self._randint_values.pop(0)
+
+    def choice(self, _seq):
+        assert self._choice_values
+        return self._choice_values.pop(0)
+
+
+def test_roll_expression_basic():
+    rng = FakeRandom(randint_values=[2, 4, 5])
+    result = roll_expression("3d6", rng=rng)
+
+    assert result.total == 11
+    assert result.format() == "3d6 = 11\n+3d6=[2, 4, 5]"
+
+
+def test_roll_expression_multiple_terms():
+    rng = FakeRandom(randint_values=[14, 3, 1])
+    result = roll_expression("d20+1d4-2", rng=rng)
+
+    assert result.total == 15
+    assert result.format() == "d20+1d4-2 = 15\n+1d20=[14] +1d4=[3] -2=2"
+
+
+def test_roll_expression_df():
+    rng = FakeRandom(choice_values=[-1, 0, 1, 1])
+    result = roll_expression("4dF", rng=rng)
+
+    assert result.total == 1
+    assert result.format() == "4dF = 1\n+4dF=[-1, +0, +1, +1]"
+
+
+@pytest.mark.parametrize(
+    ("expr", "message"),
+    [
+        ("", "请提供要掷的表达式"),
+        ("abc", "无法解析表达式"),
+        ("1d0", "骰子面数必须大于 0"),
+        ("0d6", "骰子个数必须大于 0"),
+        ("101d6", "单项最多只能掷 100 个骰子"),
+        ("1d1001", "骰子面数不能超过 1000"),
+        ("201d1", "单项最多只能掷 100 个骰子"),
+        ("1d6*2", "表达式中含有无法识别的内容"),
+    ],
+)
+def test_roll_expression_invalid(expr: str, message: str):
+    with pytest.raises(RollError, match=message):
+        roll_expression(expr, rng=random.Random(0))
+
+
+def test_roll_expression_total_roll_limit():
+    with pytest.raises(RollError, match="一次最多只能实际掷 200 个骰子"):
+        roll_expression("100d6+100d6+1d6", rng=random.Random(0))