release: Iridium 26.9.1

MCDR plugin: item share, hat, player head, calculator, join MOTD.
All rights reserved. Author: 云镜之端/SKYMirror

.gitignore

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+__pycache__/
+*.py[cod]
+*.egg-info/
+.pytest_cache/
+config/
+logs/
+.DS_Store
+Iridium.mcdr

CHANGELOG.md

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+# Changelog
+
+本文件记录 Iridium 的重要变更。
+
+## [26.9.1] - 2026-09-13
+
+### Added
+- `!!share`：展示主手物品（悬停完整数据，1.16+ 点击复制，可选提示音）
+- `!!hat`：主手物品与头部装备互换（需 RCON）
+- `!!head [player]`：获取一个玩家头颅，支持冷却与权限
+- `!!c <expression>`：游戏内四则运算计算器（AST 白名单，零依赖）
+- 进服 MOTD：开服天数、自定义文案、可点击链接、`§` 颜色
+- 进服命令提示（可点击填入聊天框）
+- 按 Minecraft 版本分支；不支持的功能会明确提示
+
+### Security
+- 玩家名统一清洗为 `[A-Za-z0-9_]` 并限长后再拼进 `/give`、`data get`、`item replace`
+- 控制台命令去除换行，防止拆成多行二次执行
+- tellraw 对物品 SNBT 做 JSON 转义与长度截断
+- MOTD 链接仅允许 `http://` / `https://`

LICENSE

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+Copyright (c) 2026 云镜之端/SKYMirror. All Rights Reserved.
+
+本软件及相关文档文件（以下统称“本软件”）之著作权归 云镜之端/SKYMirror 所有。
+
+保留所有权益。未经著作权人书面许可，不得对本软件进行复制、修改、合并、发布、
+分发、再许可、出售或以其他方式使用（包括但不限于商业用途）。
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Iridium
+
+MCDReforged 插件：物品展示 / 戴头 / 获取头颅 / 游戏内计算器 / 进服 MOTD。
+
+| | |
+|---|---|
+| 版本 | **26.9.1** |
+| 作者 | 云镜之端/SKYMirror |
+| 许可 | 保留所有权益（All Rights Reserved） |
+| 前置 | MCDReforged `>= 2.6.0` |
+| MC | **1.7.10+**（按版本分支；不支持的功能会提示） |
+| 依赖 | 无第三方 Python 包 |
+
+## 功能一览
+
+| 功能 | 说明 |
+|------|------|
+| `!!share` | 展示主手物品：悬停看完整 NBT/组件，1.16+ 可点击复制，可选提示音 |
+| `!!hat` | 主手与头部装备互换 |
+| `!!head [player]` | 给自己或指定玩家 **1 个** 头颅；有冷却 |
+| `!!c <表达式>` | 四则运算 + 括号：`+ - * / // % ** ^` |
+| 进服 MOTD | 开服天数、自定义行、可点击链接、`§` 颜色 |
+| 进服命令提示 | 可点击填入聊天框 |
+
+## 安装
+
+### 方式 A：使用发布包
+
+1. 下载 `Iridium.mcdr`
+2. 放入 MCDR 的 `plugins/` 目录
+3. `!!MCDR reload plugin` 或重启 MCDR
+
+### 方式 B：从源码打包
+
+```bash
+./pack.sh
+# 或
+zip -r Iridium.mcdr iridium lang mcdreforged.plugin.json LICENSE
+```
+
+### 使用 `!!hat` / 无 RCON 的 `!!share`
+
+在 `server.properties` 中启用 RCON，并在 MCDR 配置里填好连接信息：
+
+```properties
+enable-rcon=true
+rcon.port=25575
+rcon.password=your_password
+```
+
+| 功能 | 无 RCON | 有 RCON |
+|------|---------|---------|
+| `!!share` | 可用（解析控制台回包，空手可能超时提示） | 推荐 |
+| `!!hat` | 不可用（会提示） | 必需 |
+
+## 命令
+
+| 命令 | 权限（默认） | 说明 |
+|------|--------------|------|
+| `!!share` | `permission` | 展示主手物品 |
+| `!!hat` | `permission` | 手与头盔交换 |
+| `!!head` | `permission` | 给自己一个头颅 |
+| `!!head <player>` | `permission` | 给自己一个该玩家的头颅 |
+| `!!c <表达式>` | `permission` | 计算并私聊回复结果 |
+
+帮助列表可用 `!!help` 查看（已注册 help message）。
+
+## 版本能力
+
+| 功能 | 1.7.10 | 1.8–1.12 | 1.13–1.16 | 1.17–1.20.4 | 1.20.5+ |
+|------|:------:|:--------:|:---------:|:-----------:|:-------:|
+| `!!c` | ✅ | ✅ | ✅ | ✅ | ✅ |
+| `!!head` | ✅ | ✅ | ✅ | ✅ | ✅ profile 组件 |
+| `!!share` | ❌ 提示 | ✅ entitydata | ✅ data get | ✅ | ✅ |
+| `!!hat` | ❌ 提示 | ✅ RCON | ✅ RCON | ✅ RCON | ✅ RCON |
+| MOTD / 进服提示 | ✅ | ✅ | ✅ | ✅ | ✅ |
+
+无法检测版本时会提示；可在配置中设置 `force_version`（如 `"1.12.2"`）。
+
+## 配置
+
+路径：`config/iridium.json`（首次加载自动生成）
+
+```json
+{
+	"permission": 1,
+	"head_cooldown_seconds": 60,
+	"hat_cooldown_seconds": 3,
+	"share_sound": true,
+	"force_version": "",
+	"join_tip": true,
+	"join_tip_delay_seconds": 1.5,
+	"motd_enabled": true,
+	"motd_start_day": "",
+	"motd_lines": [
+		"§6欢迎 §e{player}§6 加入服务器！",
+		"§7服务器已开服 §b{days}§7 天",
+		"§7官网: {link:§b点击打开官网|https://www.skymirror.top}",
+		"§7QQ群: §f985402607"
+	]
+}
+```
+
+| 字段 | 默认 | 说明 |
+|------|------|------|
+| `permission` | `1` | 各命令最低权限（0 控制台 / 1 普通玩家 / 2 OP） |
+| `head_cooldown_seconds` | `60` | `!!head` 冷却；`0` 不限制 |
+| `hat_cooldown_seconds` | `3` | `!!hat` 冷却；`0` 不限制 |
+| `share_sound` | `true` | `!!share` 是否播放提示音 |
+| `force_version` | `""` | 强制 MC 版本；留空自动检测 |
+| `join_tip` | `true` | 进服是否提示可用命令 |
+| `join_tip_delay_seconds` | `1.5` | 进服消息延迟；`0` 立即 |
+| `motd_enabled` | `true` | 是否发送 MOTD |
+| `motd_start_day` | `""` | 开服日期 `YYYY-MM-DD`（当天算第 1 天）；留空不显示天数 |
+| `motd_lines` | 见上 | MOTD 文本行 |
+
+修改配置后执行 `!!MCDR reload plugin` 生效。
+
+### MOTD 语法
+
+| 语法 | 含义 |
+|------|------|
+| `{player}` | 进服玩家名（已清洗） |
+| `{days}` / `{day}` | 开服天数 |
+| `{online}` | 在线人数，拿不到为 `?` |
+| `{link:文字\|https://url}` | 可点击链接 |
+| `{link:https://url}` | 可点击链接，显示完整 URL |
+| `§` | 原版颜色/样式（§a §e §l §r 等） |
+
+仅当 `motd_lines` 中**没有** `{days}`/`{day}` 时，才会在末尾自动追加「开服第 N 天」。
+
+## 常见问题
+
+**`!!hat` 说需要 RCON？**  
+未开启 RCON，或 MCDR 未配置 RCON 连接。见上文「使用 !!hat」。
+
+**进服没有 MOTD？**  
+检查 `motd_enabled`、`join_tip_delay_seconds`；若延迟 >0，消息会在进服后约 1.5 秒出现。
+
+**版本检测失败？**  
+等待 VersionDetector 完成，或配置 `force_version`。
+
+**`!!share` 超时？**  
+多为无 RCON 且空手（控制台无 `SelectedItem` 回包）。可开 RCON 或先手持物品再试。
+
+**如何关闭进服提示？**  
+`join_tip` 与 `motd_enabled` 可分别设为 `false`。
+
+## 安全说明
+
+- 计算器：字符 + AST 白名单，不执行任意 Python；指数上限 64。
+- 玩家名进入游戏命令前统一清洗为 `[A-Za-z0-9_]`（最长 32）。
+- 控制台命令会去掉换行，避免拆成多行执行。
+- MOTD 链接仅 `http(s)`。
+- `!!head` 每次固定 1 个，并受冷却限制。
+
+## 开发与测试
+
+```bash
+python3 tests/test_pure.py
+```
+
+无需启动 Minecraft；覆盖命令拼装、NBT 解析、计算器、MOTD 与清洗逻辑。
+
+## 版权
+
+Copyright (c) 2026 云镜之端/SKYMirror. All Rights Reserved.
+
+未经书面许可，不得复制、修改、分发或用于商业用途。详见 [LICENSE](LICENSE)。

iridium/__init__.py

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+"""Iridium — item share / hat / head / calculator for MCDReforged.
+
+Copyright (c) 2026 云镜之端/SKYMirror. All Rights Reserved.
+"""
+
+from mcdreforged.api.all import *
+
+import iridium.calculator as calculator
+import iridium.hat as hat
+import iridium.head as head
+import iridium.join_tip as join_tip
+import iridium.share as share
+from iridium.config import CONFIG_FILE, Config, apply_config
+from iridium.version_util import tr
+
+
+def on_load(server: PluginServerInterface, prev_module) -> None:
+	loaded = server.load_config_simple(
+		CONFIG_FILE,
+		target_class=Config,
+		in_data_folder=False,
+	)
+	apply_config(loaded)
+	server.logger.info(tr("loaded"))
+
+	share.register(server)
+	hat.register(server)
+	head.register(server)
+	calculator.register(server)
+	join_tip.register(server)
+
+	server.register_event_listener(MCDRPluginEvents.GENERAL_INFO, share.handle_info)
+
+	ver_hint = loaded.force_version or "auto"
+	server.logger.info(tr("version_mode", ver_hint))
+
+
+def on_unload(server: PluginServerInterface) -> None:
+	server.logger.info(tr("unloaded"))

iridium/calculator.py

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+import ast
+import operator
+import re
+from typing import Any, Union
+
+from mcdreforged.api.all import *
+
+from iridium.config import config
+from iridium.utils import check_permission
+from iridium.version_util import tr
+
+Number = Union[int, float]
+
+_BIN_OPS = {
+	ast.Add: operator.add,
+	ast.Sub: operator.sub,
+	ast.Mult: operator.mul,
+	ast.Div: operator.truediv,
+	ast.FloorDiv: operator.floordiv,
+	ast.Mod: operator.mod,
+	ast.Pow: operator.pow,
+}
+_UNARY_OPS = {
+	ast.UAdd: operator.pos,
+	ast.USub: operator.neg,
+}
+
+MAX_EXPR_LEN = 200
+MAX_POW = 64
+
+
+class CalcError(Exception):
+	pass
+
+
+def _eval_node(node: ast.AST) -> Any:
+	if isinstance(node, ast.Expression):
+		return _eval_node(node.body)
+	# ast.Constant covers int/float on Python 3.8+; do not touch ast.Num (removed in 3.12)
+	if isinstance(node, ast.Constant) and isinstance(node.value, (int, float)):
+		return node.value
+	if isinstance(node, ast.UnaryOp) and type(node.op) in _UNARY_OPS:
+		return _UNARY_OPS[type(node.op)](_eval_node(node.operand))
+	if isinstance(node, ast.BinOp) and type(node.op) in _BIN_OPS:
+		left = _eval_node(node.left)
+		right = _eval_node(node.right)
+		if isinstance(node.op, ast.Pow):
+			if isinstance(right, (int, float)) and abs(right) > MAX_POW:
+				raise CalcError("power too large")
+		return _BIN_OPS[type(node.op)](left, right)
+	raise CalcError("unsupported expression")
+
+
+def safe_eval(expression: str) -> Number:
+	expr = expression.strip()
+	if not expr:
+		raise CalcError("empty")
+	if len(expr) > MAX_EXPR_LEN:
+		raise CalcError("expression too long")
+	if not re.fullmatch(r"[0-9+\-*/%().\s^]+", expr):
+		raise CalcError("illegal character")
+	expr = expr.replace("^", "**")
+	try:
+		tree = ast.parse(expr, mode="eval")
+	except SyntaxError as e:
+		raise CalcError(str(e))
+	return _eval_node(tree)
+
+
+def _format_result(value: Number) -> str:
+	if isinstance(value, float):
+		if value.is_integer() and abs(value) < 1e15:
+			return str(int(value))
+		return f"{value:.12g}"
+	return str(value)
+
+
+def do_calc(server: PluginServerInterface, src: CommandSource, context: dict) -> None:
+	if not check_permission(src, config.permission):
+		return
+	expression = context.get("expression", "").strip()
+	try:
+		result = safe_eval(expression)
+	except CalcError as e:
+		src.reply(RText(tr("calc_error", expression, str(e)), RColor.red))
+		return
+	except ZeroDivisionError:
+		src.reply(RText(tr("calc_div_zero"), RColor.red))
+		return
+	except Exception as e:
+		src.reply(RText(tr("calc_error", expression, str(e)), RColor.red))
+		return
+
+	out = _format_result(result)
+	# Private reply to avoid flooding public chat
+	src.reply(
+		RTextList(
+			RText("[Iridium] ", RColor.gray),
+			RText(expression, RColor.yellow),
+			RText(" = ", RColor.gray),
+			RText(out, RColor.aqua, styles=RStyle.bold),
+		)
+	)
+
+
+def register(server: PluginServerInterface) -> None:
+	builder = SimpleCommandBuilder()
+	builder.command("!!c", lambda src: src.reply(RText(tr("calc_usage"), RColor.yellow)))
+	builder.command("!!c <expression>", do_calc)
+	builder.arg("expression", GreedyText)
+	builder.register(server)
+	server.register_help_message("!!c <expression>", tr("calc_help"))

iridium/config.py

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+from typing import List
+
+from mcdreforged.api.all import *
+
+
+class Config(Serializable):
+	# 使用 !!share / !!hat / !!head / !!c 所需的最低权限等级
+	permission: int = 1
+	# !!head 冷却时间（秒），0 表示不限制
+	head_cooldown_seconds: int = 60
+	# !!hat 冷却时间（秒），0 表示不限制
+	hat_cooldown_seconds: int = 3
+	# !!share 是否播放提示音
+	share_sound: bool = True
+	# 强制指定 MC 版本号（如 "1.12.2"），留空则自动检测
+	force_version: str = ""
+	# 玩家加入时是否提示可用命令
+	join_tip: bool = True
+	# 加入提示延迟（秒），避免和进服消息挤在一起
+	join_tip_delay_seconds: float = 1.5
+	# 是否发送进服 MOTD（开服天数 + 自定义行）
+	motd_enabled: bool = True
+	# 开服日期，格式 YYYY-MM-DD，用于计算开服天数；留空则不显示天数
+	motd_start_day: str = ""
+	# MOTD 文本行。支持：
+	#   {player} 玩家名
+	#   {days}   开服天数
+	#   {online} 在线人数（拿不到时显示 ?）
+	#   {link:显示文字|https://url}  可点击链接
+	#   {link:https://url}           链接，显示为完整 URL
+	#   § 颜色代码
+	motd_lines: List[str] = [
+		"§6欢迎 §e{player}§6 加入服务器！",
+		"§7服务器已开服 §b{days}§7 天",
+		"§7官网: {link:§b点击打开官网|https://www.skymirror.top}",
+		"§7QQ群: §f985402607",
+	]
+
+
+CONFIG_FILE = "config/iridium.json"
+
+# 模块级单例；on_load 时原地更新字段，避免各模块持有过期引用
+config = Config()
+
+
+def apply_config(new_cfg: Config) -> None:
+	config.permission = new_cfg.permission
+	config.head_cooldown_seconds = new_cfg.head_cooldown_seconds
+	config.hat_cooldown_seconds = new_cfg.hat_cooldown_seconds
+	config.share_sound = new_cfg.share_sound
+	config.force_version = new_cfg.force_version
+	config.join_tip = new_cfg.join_tip
+	config.join_tip_delay_seconds = new_cfg.join_tip_delay_seconds
+	config.motd_enabled = new_cfg.motd_enabled
+	config.motd_start_day = new_cfg.motd_start_day
+	config.motd_lines = list(new_cfg.motd_lines)

iridium/hat.py

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+import re
+from typing import Optional, Tuple
+
+from mcdreforged.api.all import *
+
+from iridium.config import config
+from iridium.utils import (
+	check_cooldown,
+	check_permission,
+	looks_like_item_snbt,
+	mark_cooldown,
+	parse_selected_item,
+	require_player,
+	rcon_query,
+	safe_execute,
+	sanitize_name,
+	strip_data_prefix,
+)
+from iridium.version_util import is_at_least, require_version, tr
+
+AIR_RE = re.compile(r'id\s*:\s*"(minecraft:)?air"')
+
+
+def _is_air(snbt: Optional[str]) -> bool:
+	if snbt is None:
+		return True
+	stripped = snbt.strip()
+	return stripped in ("{}", "", "[]") or bool(AIR_RE.search(stripped))
+
+
+def _can_swap(version: Version) -> bool:
+	return is_at_least(version, "1.8")
+
+
+def _entitydata_query(player: str) -> str:
+	return f"entitydata {sanitize_name(player)} {{}}"
+
+
+def _selected_query(player: str, version: Version) -> str:
+	name = sanitize_name(player)
+	if is_at_least(version, "1.13"):
+		return f"data get entity {name} SelectedItem"
+	return _entitydata_query(player)
+
+
+def _head_query(player: str, version: Version) -> str:
+	name = sanitize_name(player)
+	if is_at_least(version, "1.13"):
+		return f"data get entity {name} equipment.head"
+	return _entitydata_query(player)
+
+
+def _head_slot(version: Version) -> str:
+	if is_at_least(version, "1.13"):
+		return "armor.head"
+	return "slot.armor.head"
+
+
+def _hand_slot(version: Version, hotbar_index: int = 0) -> str:
+	if is_at_least(version, "1.13"):
+		return "weapon.mainhand"
+	if is_at_least(version, "1.9"):
+		return "slot.weapon"
+	return f"slot.hotbar.{hotbar_index}"
+
+
+def _extract_selected_slot(payload: str) -> int:
+	body = strip_data_prefix(payload)
+	m = re.search(r"SelectedItemSlot\s*:\s*(\d+)", body)
+	return int(m.group(1)) if m else 0
+
+
+def _extract_head_item(payload: str, version: Version) -> Optional[str]:
+	body = strip_data_prefix(payload)
+	if not body or not looks_like_item_snbt(body):
+		return None
+	if is_at_least(version, "1.13"):
+		body = body.strip()
+		if _is_air(body):
+			return None
+		return body
+	m = re.search(r"Inventory\s*:", body)
+	if m is None:
+		return None
+	i = m.end()
+	while i < len(body) and body[i].isspace():
+		i += 1
+	if i >= len(body) or body[i] != "[":
+		return None
+	depth = 0
+	inv = ""
+	for j in range(i, len(body)):
+		if body[j] == "[":
+			depth += 1
+		elif body[j] == "]":
+			depth -= 1
+			if depth == 0:
+				inv = body[i : j + 1]
+				break
+	if not inv:
+		return None
+	for sm in re.finditer(r"\{(?:[^{}]|\{[^{}]*\})*\}", inv):
+		if re.search(r"Slot\s*:\s*103b?", sm.group(0)):
+			item = sm.group(0)
+			return None if _is_air(item) else item
+	return None
+
+
+def _split_snbt_compound(snbt: str, key: str) -> Optional[str]:
+	m = re.search(rf"(?:^|[{{,\s]){re.escape(key)}\s*:\s*(\{{)", snbt)
+	if m is None:
+		return None
+	start = m.start(1)
+	depth = 0
+	for i in range(start, len(snbt)):
+		if snbt[i] == "{":
+			depth += 1
+		elif snbt[i] == "}":
+			depth -= 1
+			if depth == 0:
+				return snbt[start : i + 1]
+	return None
+
+
+def _components_to_command_inner(components_compound: str) -> str:
+	"""
+	Convert a data-get components compound into item-command component list form.
+
+	data get (1.20.5+):  components:{"minecraft:custom_name":{...}, "minecraft:damage":1}
+	item replace form:   minecraft:item[minecraft:custom_name={...},minecraft:damage=1]
+	"""
+	inner = components_compound.strip()[1:-1].strip()
+	if not inner:
+		return ""
+	# Top-level key:value pairs. Values may be compounds/lists/scalars.
+	parts = []
+	i = 0
+	n = len(inner)
+	while i < n:
+		while i < n and inner[i] in ", \t\n":
+			i += 1
+		if i >= n:
+			break
+		# key
+		key_m = re.match(r'"([^"]+)"', inner[i:])
+		if key_m is None:
+			key_m = re.match(r"([A-Za-z0-9_.:\-]+)", inner[i:])
+			if key_m is None:
+				i += 1
+				continue
+		key = key_m.group(1)
+		i += key_m.end()
+		while i < n and inner[i].isspace():
+			i += 1
+		if i >= n or inner[i] != ":":
+			continue
+		i += 1
+		while i < n and inner[i].isspace():
+			i += 1
+		# value
+		if i >= n:
+			break
+		if inner[i] == "{":
+			depth = 0
+			start = i
+			while i < n:
+				if inner[i] == "{":
+					depth += 1
+				elif inner[i] == "}":
+					depth -= 1
+					if depth == 0:
+						i += 1
+						break
+				i += 1
+			value = inner[start:i]
+		elif inner[i] == "[":
+			depth = 0
+			start = i
+			while i < n:
+				if inner[i] == "[":
+					depth += 1
+				elif inner[i] == "]":
+					depth -= 1
+					if depth == 0:
+						i += 1
+						break
+				i += 1
+			value = inner[start:i]
+		elif inner[i] == '"':
+			start = i
+			i += 1
+			while i < n:
+				if inner[i] == "\\":
+					i += 2
+					continue
+				if inner[i] == '"':
+					i += 1
+					break
+				i += 1
+			value = inner[start:i]
+		else:
+			start = i
+			while i < n and inner[i] not in ",":
+				i += 1
+			value = inner[start:i].strip()
+		parts.append(f"{key}={value}")
+	return ", ".join(parts)
+
+
+def _item_to_command_form(snbt: str, version: Version) -> Tuple[str, Optional[int]]:
+	id_m = re.search(r'id\s*:\s*"([^"]+)"', snbt)
+	if id_m is None:
+		return "minecraft:air", 1
+	item_id = id_m.group(1)
+	cnt: Optional[int] = None
+	if is_at_least(version, "1.20.5"):
+		c_m = re.search(r"\bcount\s*:\s*(\d+)", snbt)
+		cnt = int(c_m.group(1)) if c_m else 1
+		comps = _split_snbt_compound(snbt, "components")
+		if comps and comps != "{}":
+			inner = _components_to_command_inner(comps)
+			if inner:
+				return f"{item_id}[{inner}]", cnt
+		return item_id, cnt
+
+	c_m = re.search(r"Count\s*:\s*(\d+)", snbt)
+	cnt = int(c_m.group(1)) if c_m else 1
+	tag = _split_snbt_compound(snbt, "tag")
+	if tag and tag != "{}":
+		return f"{item_id}{tag}", cnt
+	return item_id, cnt
+
+
+def _replace_with(player: str, slot: str, item_snbt: str, version: Version) -> str:
+	name = sanitize_name(player)
+	part, count = _item_to_command_form(item_snbt, version)
+	if part.endswith(":air") or part == "air":
+		part = "air"
+		count = None
+	if is_at_least(version, "1.17"):
+		cmd = f"item replace entity {name} {slot} with {part}"
+		if count is not None and count != 1:
+			cmd += f" {count}"
+		return cmd
+	cmd = f"replaceitem entity {name} {slot} {part}"
+	if count is not None and count != 1:
+		cmd += f" {count}"
+	return cmd
+
+
+def _extract_item_payload(payload: str, version: Version) -> Optional[str]:
+	body = strip_data_prefix(payload)
+	if not looks_like_item_snbt(body):
+		return None
+	if is_at_least(version, "1.13"):
+		return body.strip()
+	return parse_selected_item(body)
+
+
+def _do_swap(server: PluginServerInterface, src: CommandSource, player: str, version: Version) -> bool:
+	if not is_at_least(version, "1.13"):
+		# Single entitydata dump contains both SelectedItem and head Inventory slot
+		dump = rcon_query(server, _entitydata_query(player))
+		if dump is None:
+			src.reply(RText(tr("hat_query_failed"), RColor.red))
+			return False
+		hotbar_index = _extract_selected_slot(dump)
+		hand = _extract_item_payload(dump, version)
+		if hand is None or _is_air(hand):
+			src.reply(RText(tr("hand_is_empty"), RColor.red))
+			return False
+		head = _extract_head_item(dump, version)
+	else:
+		hand_raw = rcon_query(server, _selected_query(player, version))
+		if hand_raw is None:
+			src.reply(RText(tr("hat_query_failed"), RColor.red))
+			return False
+		hotbar_index = 0
+		hand = _extract_item_payload(hand_raw, version)
+		if hand is None or _is_air(hand):
+			src.reply(RText(tr("hand_is_empty"), RColor.red))
+			return False
+		head = None
+		head_raw = rcon_query(server, _head_query(player, version))
+		if head_raw is not None:
+			head = _extract_head_item(head_raw, version)
+
+	head_slot = _head_slot(version)
+	hand_slot = _hand_slot(version, hotbar_index)
+	name = sanitize_name(player)
+
+	if is_at_least(version, "1.17"):
+		safe_execute(
+			server,
+			f"item replace entity {name} {head_slot} from entity {name} weapon.mainhand",
+		)
+		if head and not _is_air(head):
+			safe_execute(server, _replace_with(player, hand_slot, head, version))
+		else:
+			safe_execute(server, f"item replace entity {name} {hand_slot} with air")
+	else:
+		safe_execute(server, _replace_with(player, head_slot, hand, version))
+		if head and not _is_air(head):
+			safe_execute(server, _replace_with(player, hand_slot, head, version))
+		else:
+			safe_execute(server, _replace_with(player, hand_slot, "minecraft:air", version))
+
+	src.reply(RText(tr("hat_success"), RColor.green))
+	return True
+
+
+def do_hat(server: PluginServerInterface, src: CommandSource) -> None:
+	player = require_player(src)
+	if player is None:
+		return
+	if not check_permission(src, config.permission):
+		return
+	version = require_version(server, src)
+	if version is None:
+		return
+	if not _can_swap(version):
+		src.reply(RText(tr("hat_unsupported_version", str(version)), RColor.red))
+		return
+	if not server.is_rcon_running():
+		src.reply(RText(tr("hat_need_rcon"), RColor.red))
+		return
+	if not check_cooldown(src, player, "hat", config.hat_cooldown_seconds):
+		return
+
+	if _do_swap(server, src, player, version):
+		mark_cooldown(player, "hat")
+
+
+def register(server: PluginServerInterface) -> None:
+	server.register_command(Literal("!!hat").runs(lambda src: do_hat(server, src)))
+	server.register_help_message("!!hat", tr("hat_help"))

iridium/head.py

@@ -0,0 +1,52 @@
+from mcdreforged.api.all import *
+
+from iridium.config import config
+from iridium.utils import (
+	check_cooldown,
+	check_permission,
+	mark_cooldown,
+	require_player,
+	safe_execute,
+	sanitize_name,
+)
+from iridium.version_util import is_at_least, require_version, tr
+
+
+def _give_head_command(player: str, target: str, version: Version) -> str:
+	# Defense in depth: never interpolate an unsanitized name
+	safe_player = sanitize_name(player) or "Steve"
+	safe_target = sanitize_name(target) or safe_player
+	if is_at_least(version, "1.20.5"):
+		return f'give {safe_player} minecraft:player_head[minecraft:profile="{safe_target}"] 1'
+	if is_at_least(version, "1.13"):
+		return f'give {safe_player} minecraft:player_head{{SkullOwner:"{safe_target}"}} 1'
+	return f'give {safe_player} minecraft:skull 1 3 {{SkullOwner:"{safe_target}"}}'
+
+
+def do_head(server: PluginServerInterface, src: CommandSource, context: dict) -> None:
+	player = require_player(src)
+	if player is None:
+		return
+	if not check_permission(src, config.permission):
+		return
+	version = require_version(server, src)
+	if version is None:
+		return
+
+	target = context.get("player_name") or player
+	safe_target = sanitize_name(target) or sanitize_name(player) or player
+	if not check_cooldown(src, player, "head", config.head_cooldown_seconds):
+		return
+
+	safe_execute(server, _give_head_command(player, safe_target, version))
+	mark_cooldown(player, "head")
+	src.reply(RText(tr("head_success", safe_target), RColor.green))
+
+
+def register(server: PluginServerInterface) -> None:
+	builder = SimpleCommandBuilder()
+	builder.command("!!head", lambda src: do_head(server, src, {}))
+	builder.command("!!head <player_name>", lambda src, ctx: do_head(server, src, ctx))
+	builder.arg("player_name", Text)
+	builder.register(server)
+	server.register_help_message("!!head [player]", tr("head_help", config.head_cooldown_seconds))

iridium/join_tip.py

@@ -0,0 +1,242 @@
+import re
+import threading
+from datetime import datetime
+from typing import List, Optional, Tuple
+
+from mcdreforged.api.all import *
+
+from iridium.config import config
+from iridium.utils import sanitize_name
+from iridium.version_util import tr
+
+LINK_WITH_TEXT_RE = re.compile(r"\{link:(?P<text>[^|}]+)\|(?P<url>[^}]+)\}")
+LINK_URL_ONLY_RE = re.compile(r"\{link:(?P<url>[^}|]+)\}")
+
+_COLOR_MAP = {
+	"0": RColor.black,
+	"1": RColor.dark_blue,
+	"2": RColor.dark_green,
+	"3": RColor.dark_aqua,
+	"4": RColor.dark_red,
+	"5": RColor.dark_purple,
+	"6": RColor.gold,
+	"7": RColor.gray,
+	"8": RColor.dark_gray,
+	"9": RColor.blue,
+	"a": RColor.green,
+	"b": RColor.aqua,
+	"c": RColor.red,
+	"d": RColor.light_purple,
+	"e": RColor.yellow,
+	"f": RColor.white,
+}
+
+_STYLE_MAP = {
+	"k": RStyle.obfuscated,
+	"l": RStyle.bold,
+	"m": RStyle.strikethrough,
+	"n": RStyle.underlined,
+	"o": RStyle.italic,
+}
+
+
+def server_days() -> Optional[int]:
+	raw = (config.motd_start_day or "").strip()
+	if not raw:
+		return None
+	for fmt in ("%Y-%m-%d", "%Y/%m/%d", "%Y.%m.%d"):
+		try:
+			start = datetime.strptime(raw, fmt)
+		except ValueError:
+			continue
+		return max(0, (datetime.now() - start).days) + 1
+	return None
+
+
+def online_hint(server: ServerInterface) -> str:
+	try:
+		info = server.get_server_information()
+		if info is not None and getattr(info, "player_count", None) is not None:
+			return str(info.player_count)
+	except Exception:
+		pass
+	return "?"
+
+
+def replace_placeholders(line: str, player: str, server: ServerInterface) -> str:
+	days = server_days()
+	days_text = str(days) if days is not None else "?"
+	# Sanitize player name before it can re-enter the {link:...} parser or § codes
+	safe_player = sanitize_name(player) or "Player"
+	return (
+		line.replace("{player}", safe_player)
+		.replace("{days}", days_text)
+		.replace("{day}", days_text)
+		.replace("{online}", online_hint(server))
+	)
+
+
+def parse_colored_pieces(segment: str) -> List[RText]:
+	"""Split a string with § color codes into RText pieces."""
+	pieces: List[RText] = []
+	color: Optional[RColor] = None
+	styles: List[RStyle] = []
+	buf = ""
+
+	def flush() -> None:
+		nonlocal buf
+		if not buf:
+			return
+		pieces.append(RText(buf, color=color, styles=list(styles) if styles else None))
+		buf = ""
+
+	i = 0
+	n = len(segment)
+	while i < n:
+		if segment[i] == "§" and i + 1 < n:
+			code = segment[i + 1].lower()
+			i += 2
+			if code == "r":
+				flush()
+				color = None
+				styles = []
+				continue
+			if code in _COLOR_MAP:
+				flush()
+				color = _COLOR_MAP[code]
+				styles = []
+				continue
+			if code in _STYLE_MAP:
+				flush()
+				style = _STYLE_MAP[code]
+				if style not in styles:
+					styles.append(style)
+				continue
+			buf += f"§{code}"
+			continue
+		buf += segment[i]
+		i += 1
+	flush()
+	return pieces or [RText(segment or "")]
+
+
+def _apply_click(piece: RText, url: str) -> RText:
+	return piece.c(RAction.open_url, url).h(RText(url, RColor.gray))
+
+
+def render_motd_line(line: str, player: str, server: ServerInterface) -> List[RText]:
+	raw = replace_placeholders(line, player, server)
+
+	# Tokenize: plain text | (text, url)
+	tokens: List[Tuple[str, str, Optional[str]]] = []
+	last = 0
+
+	def push_text(chunk: str) -> None:
+		if chunk:
+			tokens.append(("text", chunk, None))
+
+	for match in LINK_WITH_TEXT_RE.finditer(raw):
+		push_text(raw[last : match.start()])
+		tokens.append(("link", match.group("text"), match.group("url").strip()))
+		last = match.end()
+
+	# Remaining part may still contain {link:url}
+	rest = raw[last:]
+	pos = 0
+	for match in LINK_URL_ONLY_RE.finditer(rest):
+		push_text(rest[pos : match.start()])
+		url = match.group("url").strip()
+		tokens.append(("link", url, url))
+		pos = match.end()
+	push_text(rest[pos:])
+	if not tokens:
+		tokens.append(("text", raw, None))
+
+	out: List[RText] = []
+	for kind, text, url in tokens:
+		if kind == "text":
+			out.extend(parse_colored_pieces(text))
+			continue
+		assert url is not None
+		if not url.lower().startswith(("http://", "https://")):
+			out.extend(parse_colored_pieces(text))
+			continue
+		colored = parse_colored_pieces(text)
+		if not colored:
+			colored = [RText(text, RColor.aqua)]
+		for piece in colored:
+			out.append(_apply_click(piece, url))
+	return out
+
+
+def build_motd(player: str, server: ServerInterface) -> Optional[RTextList]:
+	if not config.motd_enabled:
+		return None
+	lines = list(config.motd_lines or [])
+	if not lines:
+		return None
+	parts: List[RText] = [
+		RText(tr("motd_header"), RColor.gold, styles=[RStyle.bold])
+	]
+	for line in lines:
+		parts.append(RText("\n"))
+		parts.extend(render_motd_line(line, player, server))
+	# Only auto-append the day footer when no line already uses {days}/{day}
+	days = server_days()
+	if days is not None and not any(("{days}" in ln or "{day}" in ln) for ln in lines):
+		parts.append(RText("\n"))
+		parts.append(RText(tr("motd_days", days), RColor.gray))
+	return RTextList(*parts)
+
+
+def command_line(cmd: str, desc: str) -> List[RText]:
+	return [
+		RText(cmd, RColor.aqua, styles=[RStyle.underlined])
+		.c(RAction.suggest_command, cmd)
+		.h(RText(tr("join_tip_click"), RColor.gray)),
+		RText(" - ", RColor.dark_gray),
+		RText(desc, RColor.white),
+	]
+
+
+def build_command_tip() -> RTextList:
+	parts: List[RText] = [
+		RText("[Iridium] ", RColor.gray),
+		RText(tr("join_tip_header"), RColor.gold),
+	]
+	for cmd, desc in (
+		("!!share", tr("share_help")),
+		("!!hat", tr("hat_help")),
+		("!!head", tr("head_help_short")),
+		("!!c 1+1", tr("calc_help")),
+	):
+		parts.append(RText("\n"))
+		parts.extend(command_line(cmd, desc))
+	return RTextList(*parts)
+
+
+def send_join_message(server: ServerInterface, player: str) -> None:
+	try:
+		motd = build_motd(player, server)
+		if motd is not None:
+			server.tell(player, motd)
+		if config.join_tip:
+			server.tell(player, build_command_tip())
+	except Exception as e:
+		server.logger.debug(f"join message failed for {player}: {e}")
+
+
+def on_player_joined(server: PluginServerInterface, player: str, info: Info) -> None:
+	if not config.motd_enabled and not config.join_tip:
+		return
+	delay = max(0.0, float(config.join_tip_delay_seconds))
+	if delay <= 0:
+		send_join_message(server, player)
+		return
+	timer = threading.Timer(delay, lambda: send_join_message(server, player))
+	timer.daemon = True
+	timer.start()
+
+
+def register(server: PluginServerInterface) -> None:
+	server.register_event_listener(MCDRPluginEvents.PLAYER_JOIN, on_player_joined)

iridium/share.py

@@ -0,0 +1,213 @@
+import json
+import re
+import threading
+import time
+from typing import Dict, Optional, Tuple
+
+from mcdreforged.api.all import *
+
+from iridium.config import config
+from iridium.utils import (
+	check_permission,
+	looks_like_item_snbt,
+	parse_selected_item,
+	require_player,
+	rcon_query,
+	safe_execute,
+	sanitize_name,
+	strip_data_prefix,
+)
+from iridium.version_util import is_at_least, require_version, tr
+
+# pending share requests: player -> (src, version, expire_ts)
+_pending: Dict[str, Tuple[CommandSource, Version, float]] = {}
+_pending_lock = threading.Lock()
+
+PENDING_TTL = 5.0
+# Keep tellraw well under typical command-length limits
+MAX_SNBT_LEN = 20000
+
+PLAYER_DATA_RE = re.compile(
+	r"^(?P<name>\S+) has the following entity data: (?P<data>.*)$",
+	re.IGNORECASE,
+)
+
+
+def _can_read_selected_item(version: Version) -> bool:
+	return is_at_least(version, "1.8")
+
+
+def _query_command(player: str, version: Version) -> str:
+	name = sanitize_name(player)
+	if is_at_least(version, "1.13"):
+		return f"data get entity {name} SelectedItem"
+	return f"entitydata {name} {{}}"
+
+
+def _sound_command(version: Version) -> str:
+	if is_at_least(version, "1.9"):
+		return "playsound minecraft:entity.arrow.hit_player master @a"
+	return "playsound random.successful_hit @a"
+
+
+def _is_air(snbt: Optional[str]) -> bool:
+	if snbt is None:
+		return True
+	stripped = snbt.strip()
+	return stripped in ("{}", "", "[]") or bool(
+		re.search(r'id\s*:\s*"(minecraft:)?air"', stripped)
+	)
+
+
+def _json_str(value: str) -> str:
+	return json.dumps(value, ensure_ascii=False)[1:-1]
+
+
+def _build_tellraw(player: str, item_snbt: str, version: Version) -> str:
+	# Truncate pathological NBT (huge books etc.) so the command stays valid
+	if len(item_snbt) > MAX_SNBT_LEN:
+		item_snbt = item_snbt[:MAX_SNBT_LEN] + "..."
+	snbt = _json_str(item_snbt)
+	player_js = _json_str(sanitize_name(player) or player)
+
+	if is_at_least(version, "1.21.5"):
+		hover = '{"action":"show_item","contents":"' + snbt + '"}'
+	else:
+		hover = '{"action":"show_item","value":"' + snbt + '"}'
+
+	if is_at_least(version, "1.16"):
+		click = '{"action":"copy_to_clipboard","value":"' + snbt + '"}'
+		click_label = _json_str(tr("click_copy"))
+	else:
+		# pre-1.16 has no copy_to_clipboard; suggest the version-appropriate query cmd
+		safe_player = sanitize_name(player)
+		if is_at_least(version, "1.13"):
+			suggest = f"/data get entity {safe_player} SelectedItem"
+		else:
+			suggest = f"/entitydata {safe_player} {{}}"
+		click = '{"action":"suggest_command","value":"' + _json_str(suggest) + '"}'
+		click_label = _json_str(tr("click_suggest"))
+
+	id_match = re.search(r'id\s*:\s*"([^"]+)"', item_snbt)
+	item_id = id_match.group(1) if id_match else "?"
+	name_match = re.search(r'"text"\s*:\s*"([^"]+)"', item_snbt)
+	display = name_match.group(1) if name_match else item_id
+	display_js = _json_str(display)
+
+	json_text = (
+		'[{"text":"[Iridium] ","color":"gray"},'
+		'{"text":"' + player_js + '","color":"yellow"},'
+		'{"text":" ' + _json_str(tr("share_showing")) + ' "},'
+		'{"text":"' + display_js + '","color":"aqua","hoverEvent":' + hover + "},"
+		'{"text":" [' + click_label + ']","color":"aqua","bold":true,'
+		'"underlined":true,"hoverEvent":' + hover + ',"clickEvent":' + click + "}]"
+	)
+	return f"tellraw @a {json_text}"
+
+
+def _send_share(
+	server: PluginServerInterface,
+	src: CommandSource,
+	player: str,
+	item_snbt: str,
+	version: Version,
+) -> bool:
+	if _is_air(item_snbt) or not looks_like_item_snbt(item_snbt):
+		src.reply(RText(tr("hand_is_empty"), RColor.red))
+		return False
+	safe_execute(server, _build_tellraw(player, item_snbt, version))
+	if config.share_sound:
+		safe_execute(server, _sound_command(version))
+	src.reply(RText(tr("share_done"), RColor.green))
+	return True
+
+
+def _extract_item(payload: str, version: Version) -> Optional[str]:
+	"""Normalize an entity-data payload into a single-item SNBT string, or None."""
+	if not payload:
+		return None
+	body = strip_data_prefix(payload)
+	if not looks_like_item_snbt(body):
+		return None
+	if is_at_least(version, "1.13"):
+		return body.strip()
+	return parse_selected_item(body)
+
+
+def _purge_expired_pending() -> None:
+	now = time.time()
+	expired = [p for p, (_, _, exp) in _pending.items() if now >= exp]
+	for p in expired:
+		_pending.pop(p, None)
+
+
+def do_share(server: PluginServerInterface, src: CommandSource) -> None:
+	player = require_player(src)
+	if player is None:
+		return
+	if not check_permission(src, config.permission):
+		return
+	version = require_version(server, src)
+	if version is None:
+		return
+	if not _can_read_selected_item(version):
+		src.reply(RText(tr("share_unsupported_version", str(version)), RColor.red))
+		return
+
+	query = _query_command(player, version)
+	raw = rcon_query(server, query)
+	if raw is not None:
+		item = _extract_item(raw, version)
+		if item is None:
+			src.reply(RText(tr("hand_is_empty"), RColor.red))
+			return
+		_send_share(server, src, player, item, version)
+		return
+
+	with _pending_lock:
+		_purge_expired_pending()
+		_pending[player] = (src, version, time.time() + PENDING_TTL)
+	safe_execute(server, query)
+
+	# If the console never answers (empty hand / command error), tell the player
+	def _timeout_notice() -> None:
+		with _pending_lock:
+			pending = _pending.get(player)
+			if pending is None:
+				return
+			src2, _ver, expire = pending
+			if time.time() < expire:
+				return
+			_pending.pop(player, None)
+		src2.reply(RText(tr("share_timeout"), RColor.red))
+
+	timer = threading.Timer(PENDING_TTL + 0.1, _timeout_notice)
+	timer.daemon = True
+	timer.start()
+
+
+def handle_info(server: PluginServerInterface, info: Info) -> None:
+	if info.is_player:
+		return
+	match = PLAYER_DATA_RE.match(info.content)
+	if match is None:
+		return
+	name = match.group("name")
+	with _pending_lock:
+		pending = _pending.pop(name, None)
+	if pending is None:
+		return
+	src, version, expire = pending
+	if time.time() >= expire:
+		src.reply(RText(tr("share_timeout"), RColor.red))
+		return
+	item = _extract_item(match.group(0), version)
+	if item is None:
+		src.reply(RText(tr("hand_is_empty"), RColor.red))
+		return
+	_send_share(server, src, name, item, version)
+
+
+def register(server: PluginServerInterface) -> None:
+	server.register_command(Literal("!!share").runs(lambda src: do_share(server, src)))
+	server.register_help_message("!!share", tr("share_help"))

iridium/utils.py

@@ -0,0 +1,142 @@
+import re
+import time
+from typing import Dict, Optional
+
+from mcdreforged.api.all import *
+
+from iridium.version_util import tr
+
+DATA_PREFIX_RE = re.compile(r"^.+ has the following entity data: ", re.IGNORECASE)
+# A payload that looks like an item / entity SNBT, not an error line
+SNBT_ITEM_RE = re.compile(r'id\s*:\s*"', re.IGNORECASE)
+# Only allow Minecraft-safe name characters
+SAFE_NAME_RE = re.compile(r"[^A-Za-z0-9_]")
+MAX_NAME_LEN = 32
+
+# player -> last success timestamp
+_cooldowns: Dict[str, float] = {}
+
+
+def sanitize_name(raw: str) -> str:
+	"""Keep only [A-Za-z0-9_], cap length. Empty string means invalid."""
+	return SAFE_NAME_RE.sub("", raw or "").strip()[:MAX_NAME_LEN]
+
+
+def sanitize_cmd(text: str) -> str:
+	"""Neutralize characters that could split a console/RCON command line."""
+	# Newlines/carriage returns would create a second command on stdin
+	return (text or "").replace("\r", " ").replace("\n", " ")
+
+
+def safe_execute(server: PluginServerInterface, command: str) -> None:
+	server.execute(sanitize_cmd(command))
+
+
+def check_permission(src: CommandSource, level: int) -> bool:
+	if src.has_permission(level):
+		return True
+	src.reply(RText(tr("required_permission", level), RColor.red))
+	return False
+
+
+def require_player(src: CommandSource) -> Optional[str]:
+	if not src.is_player:
+		src.reply(RText(tr("player_only"), RColor.red))
+		return None
+	return src.get_info().player
+
+
+def check_cooldown(src: CommandSource, player: str, bucket: str, seconds: int) -> bool:
+	"""Return True if the player may proceed. seconds <= 0 disables the limit."""
+	if seconds <= 0:
+		return True
+	key = f"{bucket}:{player}"
+	now = time.time()
+	last = _cooldowns.get(key)
+	if last is not None and now - last < seconds:
+		remain = max(1, int(seconds - (now - last) + 0.999))
+		src.reply(RText(tr("on_cooldown", remain), RColor.red))
+		return False
+	return True
+
+
+def mark_cooldown(player: str, bucket: str) -> None:
+	_cooldowns[f"{bucket}:{player}"] = time.time()
+
+
+def strip_data_prefix(payload: str) -> str:
+	"""Strip the '<name> has the following entity data: ' prefix."""
+	return DATA_PREFIX_RE.sub("", payload, count=1).strip()
+
+
+def looks_like_item_snbt(snbt: str) -> bool:
+	"""True when the text contains an item id field (not a command error line)."""
+	return bool(snbt) and bool(SNBT_ITEM_RE.search(snbt))
+
+
+def _read_balanced(text: str, start: int, open_ch: str, close_ch: str) -> Optional[str]:
+	"""Return the balanced substring starting at text[start] == open_ch."""
+	if start >= len(text) or text[start] != open_ch:
+		return None
+	depth = 0
+	for i in range(start, len(text)):
+		c = text[i]
+		if c == open_ch:
+			depth += 1
+		elif c == close_ch:
+			depth -= 1
+			if depth == 0:
+				return text[start : i + 1]
+	return None
+
+
+def extract_compound(payload: str, key: str) -> Optional[str]:
+	"""
+	Extract a top-level field such as SelectedItem from entity NBT text.
+	Supports compound `{...}` and list `[...]` values.
+	"""
+	m = re.search(rf"(?:^|[{{,\s]){re.escape(key)}\s*:", payload)
+	if m is None:
+		return None
+	i = m.end()
+	while i < len(payload) and payload[i].isspace():
+		i += 1
+	if i >= len(payload):
+		return None
+	if payload[i] == "{":
+		return _read_balanced(payload, i, "{", "}")
+	if payload[i] == "[":
+		return _read_balanced(payload, i, "[", "]")
+	# primitive value until comma or closing brace/bracket
+	j = i
+	while j < len(payload) and payload[j] not in ",}]":
+		j += 1
+	return payload[i:j].strip()
+
+
+def parse_selected_item(entity_nbt: str) -> Optional[str]:
+	"""Pull SelectedItem (or first HandItems entry) out of a full player NBT dump."""
+	value = extract_compound(entity_nbt, "SelectedItem")
+	if value is not None and looks_like_item_snbt(value):
+		return value
+
+	hand_items = extract_compound(entity_nbt, "HandItems")
+	if hand_items is None:
+		return None
+	# HandItems: [{id:"...",Count:1b},{}] — take the first non-empty item
+	inner = re.search(r"\{[^{}]*(?:\{[^{}]*\}[^{}]*)*\}", hand_items)
+	if inner is not None:
+		item = inner.group(0)
+		if looks_like_item_snbt(item):
+			return item
+	return None
+
+
+def rcon_query(server: PluginServerInterface, command: str) -> Optional[str]:
+	if not server.is_rcon_running():
+		return None
+	try:
+		return server.rcon_query(command)
+	except Exception as e:
+		server.logger.debug(f"RCON query failed: {e}")
+		return None

iridium/version_util.py

@@ -0,0 +1,50 @@
+from typing import Optional
+
+from mcdreforged.api.all import *
+
+from iridium.config import config
+
+# Fallback strings when ServerInterface is unavailable (unit tests / early import)
+_FALLBACK = {
+	"click_copy": "click to copy data",
+	"click_suggest": "click for data command",
+	"calc_usage": "Usage: !!c <expression>",
+	"share_showing": "is showing",
+}
+
+
+def tr(key: str, *args) -> str:
+	si = ServerInterface.get_instance()
+	if si is None:
+		text = _FALLBACK.get(key, key)
+		if args:
+			try:
+				return text.format(*args)
+			except Exception:
+				return text
+		return text
+	return si.tr(f"iridium.{key}", *args)
+
+
+def get_mc_version(server: PluginServerInterface) -> Optional[Version]:
+	"""Return the detected Minecraft server version, or None."""
+	if config.force_version:
+		try:
+			return Version(config.force_version)
+		except Exception:
+			server.logger.warning(tr("bad_force_version", config.force_version))
+	info = server.get_server_information()
+	if info is None or info.version is None:
+		return None
+	return info.version
+
+
+def require_version(server: PluginServerInterface, src: CommandSource) -> Optional[Version]:
+	version = get_mc_version(server)
+	if version is None:
+		src.reply(RText(tr("version_unknown"), RColor.red))
+	return version
+
+
+def is_at_least(version: Version, target: str) -> bool:
+	return version >= Version(target)

lang/en_us.yml

@@ -0,0 +1,32 @@
+iridium.loaded: Iridium loaded
+iridium.unloaded: Iridium unloaded
+iridium.version_mode: Version detection mode: {0}
+iridium.bad_force_version: Invalid force_version in config: {0}
+iridium.version_unknown: Unable to detect Minecraft version. Wait for VersionDetector, or set force_version in config
+iridium.player_only: This command can only be used by a player in-game
+iridium.required_permission: Insufficient permission, requires level {0}
+iridium.on_cooldown: Cooldown, wait {0}s
+iridium.hand_is_empty: No usable item in hand
+iridium.share_help: Show the item in your main hand (hover to view)
+iridium.share_done: Item shared to chat
+iridium.share_unsupported_version: Version {0} cannot read held item (needs Minecraft 1.8+)
+iridium.share_timeout: Timed out reading held item, try again later
+iridium.click_copy: click to copy data
+iridium.click_suggest: click for data command
+iridium.share_showing: is showing
+iridium.hat_help: Swap the item in your hand with your head slot
+iridium.hat_success: Swapped hand item with head equipment
+iridium.hat_unsupported_version: Version {0} does not support !!hat (needs Minecraft 1.8+)
+iridium.hat_need_rcon: !!hat requires RCON enabled to read and swap item data
+iridium.hat_query_failed: Failed to query player item data
+iridium.head_help: Get one player head (optional player name, cooldown {0}s)
+iridium.head_help_short: Get one player head (optional player name)
+iridium.head_success: You received a head of {0}
+iridium.calc_help: Evaluate an expression, e.g. !!c 1+2*(3-1)
+iridium.calc_usage: Usage: !!c <expression>, e.g. !!c 1+2*(3-1)
+iridium.calc_error: Cannot calculate {0}: {1}
+iridium.calc_div_zero: Division by zero
+iridium.join_tip_header: Iridium is enabled. Available commands: (click to fill chat)
+iridium.join_tip_click: click to fill chat
+iridium.motd_header: Server Info
+iridium.motd_days: Day {0} since server start

lang/zh_cn.yml

@@ -0,0 +1,32 @@
+iridium.loaded: Iridium 已加载
+iridium.unloaded: Iridium 已卸载
+iridium.version_mode: 版本检测模式: {0}
+iridium.bad_force_version: 配置 force_version 无效: {0}
+iridium.version_unknown: 无法检测 Minecraft 版本，请等待服务器完成 VersionDetector，或在配置中设置 force_version
+iridium.player_only: 该命令只能由玩家在游戏内使用
+iridium.required_permission: 权限不足，需要权限等级 {0}
+iridium.on_cooldown: 冷却中，请再等待 {0} 秒
+iridium.hand_is_empty: 手上没有可处理的物品
+iridium.share_help: 展示手上物品的完整信息（悬停查看）
+iridium.share_done: 已在聊天栏展示物品
+iridium.share_unsupported_version: 当前版本 {0} 无法读取手持物品（需要 Minecraft 1.8+）
+iridium.share_timeout: 读取手持物品超时，请稍后再试
+iridium.click_copy: 点击复制完整数据
+iridium.click_suggest: 点击获取完整数据命令
+iridium.share_showing: 正在展示
+iridium.hat_help: 将手上物品与头部装备互换
+iridium.hat_success: 已交换手上物品与头部装备
+iridium.hat_unsupported_version: 当前版本 {0} 不支持 !!hat（需要 Minecraft 1.8+）
+iridium.hat_need_rcon: !!hat 需要启用 RCON 才能读取并交换物品数据
+iridium.hat_query_failed: 读取玩家物品数据失败
+iridium.head_help: 获取一个玩家头颅（可指定玩家名，冷却 {0} 秒）
+iridium.head_help_short: 获取一个玩家头颅（可指定玩家名）
+iridium.head_success: 已给予你 {0} 的头颅
+iridium.calc_help: 计算表达式，例如 !!c 1+2*(3-1)
+iridium.calc_usage: 用法: !!c <表达式>，例如 !!c 1+2*(3-1)
+iridium.calc_error: 无法计算 {0}: {1}
+iridium.calc_div_zero: 除数不能为 0
+iridium.join_tip_header: 本服已启用 Iridium，可用命令：（点击命令可填入聊天框）
+iridium.join_tip_click: 点击填入聊天栏
+iridium.motd_header: 服务器信息
+iridium.motd_days: 开服第 {0} 天

mcdreforged.plugin.json

@@ -0,0 +1,18 @@
+{
+	"id": "iridium",
+	"version": "26.9.1",
+	"name": "Iridium",
+	"description": {
+		"zh_cn": "物品展示 / 戴头 / 获取头颅 / 游戏内计算器 / 进服 MOTD",
+		"en_us": "Item share / hat / player head / calculator / join MOTD"
+	},
+	"author": [
+		"云镜之端/SKYMirror"
+	],
+	"dependencies": {
+		"mcdreforged": ">=2.6.0"
+	},
+	"resources": [
+		"lang"
+	]
+}

pack.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Pack Iridium.mcdr for release. Run from repo root.
+set -euo pipefail
+cd "$(dirname "$0")"
+rm -f Iridium.mcdr
+zip -r Iridium.mcdr iridium lang mcdreforged.plugin.json LICENSE \
+	-x '*__pycache__*' -x '*.pyc'
+echo "Built Iridium.mcdr"

tests/test_pure.py

@@ -0,0 +1,253 @@
+"""Pure-function unit tests (no live MCDR server required)."""
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from mcdreforged.api.all import Version
+
+from iridium.calculator import CalcError, safe_eval
+from iridium.hat import (
+	_components_to_command_inner,
+	_extract_head_item,
+	_hand_slot,
+	_head_slot,
+	_item_to_command_form,
+	_is_air,
+)
+from iridium.head import _give_head_command
+from iridium.utils import (
+	extract_compound,
+	looks_like_item_snbt,
+	parse_selected_item,
+	sanitize_cmd,
+	sanitize_name,
+	strip_data_prefix,
+)
+
+
+def test_strip_prefix():
+	payload = 'Notch has the following entity data: {id:"minecraft:stone",Count:1b}'
+	assert strip_data_prefix(payload) == '{id:"minecraft:stone",Count:1b}'
+
+
+def test_parse_selected_item():
+	nbt = '{SelectedItem:{id:"minecraft:diamond_sword",Count:1b,tag:{Damage:1}},SelectedItemSlot:0}'
+	assert parse_selected_item(nbt) == '{id:"minecraft:diamond_sword",Count:1b,tag:{Damage:1}}'
+
+
+def test_extract_compound():
+	nbt = '{foo:1,SelectedItem:{id:"minecraft:apple",Count:3b},bar:2}'
+	assert extract_compound(nbt, "SelectedItem") == '{id:"minecraft:apple",Count:3b}'
+
+
+def test_extract_list_field():
+	nbt = '{HandItems:[{id:"minecraft:stone",Count:1b},{}]}'
+	value = extract_compound(nbt, "HandItems")
+	assert value is not None
+	assert value.startswith("[")
+	assert "minecraft:stone" in value
+
+
+def test_parse_hand_items_fallback():
+	nbt = '{HandItems:[{id:"minecraft:stone",Count:2b},{}]}'
+	item = parse_selected_item(nbt)
+	assert item == '{id:"minecraft:stone",Count:2b}'
+
+
+def test_looks_like_item_snbt():
+	assert looks_like_item_snbt('{id:"minecraft:stone",Count:1b}')
+	assert not looks_like_item_snbt("No data found for SelectedItem")
+	assert not looks_like_item_snbt("")
+	assert not looks_like_item_snbt("{}")
+
+
+def test_head_commands():
+	assert (
+		_give_head_command("Steve", "Notch", Version("1.20.5"))
+		== 'give Steve minecraft:player_head[minecraft:profile="Notch"] 1'
+	)
+	assert (
+		_give_head_command("Steve", "Notch", Version("1.16.5"))
+		== 'give Steve minecraft:player_head{SkullOwner:"Notch"} 1'
+	)
+	assert (
+		_give_head_command("Steve", "Notch", Version("1.12.2"))
+		== 'give Steve minecraft:skull 1 3 {SkullOwner:"Notch"}'
+	)
+	assert (
+		_give_head_command("Steve", 'Evil"name', Version("1.16.5"))
+		== 'give Steve minecraft:player_head{SkullOwner:"Evilname"} 1'
+	)
+	assert (
+		_give_head_command("Steve", 'Notch;give @a diamond', Version("1.16.5"))
+		== 'give Steve minecraft:player_head{SkullOwner:"Notchgiveadiamond"} 1'
+	)
+	# component / NBT breakout attempts
+	assert (
+		_give_head_command("Steve", 'alex"}{id:"minecraft:stone', Version("1.16.5"))
+		== 'give Steve minecraft:player_head{SkullOwner:"alexidminecraftstone"} 1'
+	)
+	assert (
+		_give_head_command("Steve", 'x[minecraft:profile=y]', Version("1.20.5"))
+		== 'give Steve minecraft:player_head[minecraft:profile="xminecraftprofiley"] 1'
+	)
+	# executor name is sanitized too
+	assert (
+		_give_head_command('Steve";give', "Notch", Version("1.16.5"))
+		== 'give Stevegive minecraft:player_head{SkullOwner:"Notch"} 1'
+	)
+	# length cap
+	assert (
+		_give_head_command("Steve", "A" * 100, Version("1.16.5"))
+		== 'give Steve minecraft:player_head{SkullOwner:"' + "A" * 32 + '"} 1'
+	)
+
+
+def test_item_form_modern():
+	part, count = _item_to_command_form(
+		'{id:"minecraft:diamond",count:2,components:{"minecraft:custom_name":"x"}}',
+		Version("1.20.5"),
+	)
+	assert part == 'minecraft:diamond[minecraft:custom_name="x"]'
+	assert count == 2
+
+
+def test_components_to_command_inner():
+	inner = _components_to_command_inner(
+		'{"minecraft:custom_name":{text:"hi"}, "minecraft:damage":1, "minecraft:enchantments":{}}'
+	)
+	assert 'minecraft:custom_name={text:"hi"}' in inner
+	assert "minecraft:damage=1" in inner
+	assert "minecraft:enchantments={}" in inner
+
+
+def test_item_form_legacy():
+	part, count = _item_to_command_form(
+		'{id:"minecraft:stone",Count:1b,tag:{display:{Name:"hi"}}}',
+		Version("1.12.2"),
+	)
+	assert part == 'minecraft:stone{display:{Name:"hi"}}'
+	assert count == 1
+
+
+def test_slots():
+	assert _head_slot(Version("1.20.1")) == "armor.head"
+	assert _head_slot(Version("1.12.2")) == "slot.armor.head"
+	assert _hand_slot(Version("1.20.1")) == "weapon.mainhand"
+	assert _hand_slot(Version("1.12.2")) == "slot.weapon"
+	assert _hand_slot(Version("1.8.9"), 3) == "slot.hotbar.3"
+	assert _hand_slot(Version("1.8.9")) == "slot.hotbar.0"
+
+
+def test_head_extract_1_12():
+	payload = (
+		'Steve has the following entity data: '
+		'{SelectedItem:{id:"minecraft:stone",Count:1b},'
+		'Inventory:[{Slot:103b,id:"minecraft:iron_helmet",Count:1b},{Slot:0b,id:"minecraft:dirt",Count:1b}]}'
+	)
+	item = _extract_head_item(payload, Version("1.12.2"))
+	assert item is not None
+	assert "iron_helmet" in item
+
+
+def test_is_air():
+	assert _is_air(None)
+	assert _is_air("{}")
+	assert _is_air('{id:"minecraft:air"}')
+	assert not _is_air('{id:"minecraft:stone",Count:1b}')
+
+
+def test_calculator():
+	assert safe_eval("1+2*3") == 7
+	assert safe_eval("(1+2)*(3-1)") == 6
+	assert abs(safe_eval("10/4") - 2.5) < 1e-9
+	assert safe_eval("2**10") == 1024
+	assert safe_eval("2^10") == 1024
+	try:
+		safe_eval("__import__('os')")
+		raise AssertionError("should reject")
+	except CalcError:
+		pass
+	try:
+		safe_eval("1;print(1)")
+		raise AssertionError("should reject")
+	except CalcError:
+		pass
+
+
+class _DummyServer:
+	def get_server_information(self):
+		return None
+
+
+def test_motd_days_and_links():
+	from datetime import datetime
+
+	from iridium import join_tip
+	from iridium.config import Config, apply_config
+
+	cfg = Config()
+	cfg.motd_start_day = "2020-01-01"
+	cfg.motd_enabled = True
+	apply_config(cfg)
+	days = join_tip.server_days()
+	assert days is not None
+	assert days == (datetime.now() - datetime(2020, 1, 1)).days + 1
+
+	pieces = join_tip.render_motd_line(
+		"§e欢迎 §f{player}§e，官网 {link:§b打开|https://example.com}",
+		"Steve",
+		_DummyServer(),
+	)
+	assert pieces
+	joined = "".join(p.to_plain_text() for p in pieces)
+	assert "Steve" in joined
+	assert "打开" in joined
+
+
+def test_motd_placeholder_replacement():
+	from iridium import join_tip
+	from iridium.config import Config, apply_config
+
+	cfg = Config()
+	cfg.motd_start_day = ""
+	cfg.motd_lines = ["hi {player} / {days} / {online}"]
+	apply_config(cfg)
+	text = join_tip.replace_placeholders("hi {player} / {days} / {online}", "Alex", _DummyServer())
+	assert text == "hi Alex / ? / ?"
+
+
+def test_sanitize_name_and_cmd():
+	assert sanitize_name("Steve") == "Steve"
+	assert sanitize_name('Evil";give') == "Evilgive"
+	assert sanitize_name("A" * 100) == "A" * 32
+	assert sanitize_name("") == ""
+	assert sanitize_cmd("give x\ngive y") == "give x give y"
+	assert sanitize_cmd("a\r\nb") == "a  b"
+
+
+def test_share_query_sanitizes_player():
+	from mcdreforged.api.all import Version
+
+	from iridium.share import _build_tellraw, _query_command
+
+	cmd = _query_command('Steve";op', Version("1.16.5"))
+	assert 'Steveop' in cmd
+	assert '";' not in cmd
+	tr = _build_tellraw('Bad"name', '{id:"minecraft:stone",Count:1b}', Version("1.20.1"))
+	assert "Badname" in tr
+
+
+if __name__ == "__main__":
+	fns = [v for k, v in sorted(globals().items()) if k.startswith("test_") and callable(v)]
+	failed = 0
+	for fn in fns:
+		try:
+			fn()
+			print(f"PASS {fn.__name__}")
+		except Exception as e:
+			failed += 1
+			print(f"FAIL {fn.__name__}: {e}")
+	print(f"\n{len(fns) - failed}/{len(fns)} passed")
+	sys.exit(1 if failed else 0)