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windows/lanremote/protocol.py

@@ -0,0 +1,179 @@
+# -*- coding: utf-8 -*-
+"""通信协议常量与编解码。
+
+设计目标：双端零外部依赖。
+  * Windows 端：Python 标准库 socket + json
+  * 安卓端：java.net.Socket + 系统自带 org.json
+
+传输格式：TCP 长连接，每条消息一行 UTF-8 JSON，以 \\n 结尾。
+二进制负载（图片/音频/文件）用 base64 分块传输。
+"""
+from __future__ import annotations
+
+import base64
+import json
+
+DEFAULT_PORT = 8765
+PROTOCOL_VERSION = 1
+MAX_LINE_BYTES = 8 * 1024 * 1024        # 单行上限 8MB（约 6MB 原始数据）
+CHUNK_SIZE = 256 * 1024
+# 单次传输（文件 / 图片 / 音频）的总体积上限
+MAX_TOTAL_BYTES = 256 * 1024 * 1024                 # 分块大小 256KB
+
+# ---- 客户端 -> 服务端 命令 ----
+CMD_PAIR = "pair"
+CMD_AUTH = "auth"
+CMD_PING = "ping"
+CMD_IMAGE = "image"
+CMD_AUDIO = "audio"
+CMD_MEDIA = "media"
+CMD_CLIP_SET = "clip_set"
+CMD_CLIP_GET = "clip_get"
+CMD_POWER = "power"
+CMD_RUN = "run"
+CMD_SAY = "say"
+CMD_VOICE_LIST = "voice_list"
+CMD_SET_VOICE = "set_voice"
+CMD_AUDIO_LIST = "audio_list"
+CMD_PLAY_LOCAL = "play_local"
+CMD_SHUTDOWN_TIMER = "shutdown_timer"   # 定时关机 / 取消
+CMD_MONITOR = "monitor"                 # 关闭 / 打开显示器
+CMD_OPEN_URL = "open_url"               # 在电脑浏览器打开网址
+CMD_QUICK = "quick"                     # 快捷启动程序
+CMD_OPEN_FOLDER = "open_folder"         # 打开常用文件夹
+CMD_PROC_LIST = "proc_list"             # 进程列表
+CMD_PROC_KILL = "proc_kill"             # 结束进程
+CMD_BATTERY = "battery"                 # 电量
+CMD_DISK = "disk"                       # 磁盘占用
+CMD_PERF = "perf"                       # CPU / 内存占用
+CMD_CLIP_HISTORY = "clip_history"       # 剪贴板历史
+CMD_SET_WALLPAPER = "set_wallpaper"     # 把收到的图设为壁纸
+CMD_SAY_CLIP = "say_clip"               # 朗读剪贴板
+CMD_FEATURE_LIST = "feature_list"       # 电脑端能做哪些功能
+CMD_FEATURE_RUN = "feature_run"         # 执行某个功能
+CMD_AUDIO_PAUSE = "audio_pause"         # 暂停电脑正在播的音频
+CMD_AUDIO_RESUME = "audio_resume"       # 继续播放
+CMD_AUDIO_STATUS = "audio_status"       # 当前播放状态
+CMD_NOTIFY = "notify"
+CMD_FILE_PUSH = "file_push"
+CMD_FILE_LIST = "file_list"
+CMD_FILE_PULL = "file_pull"
+CMD_INFO = "info"
+CMD_SCREEN_START = "screen_start"
+CMD_SCREEN_STOP = "screen_stop"
+CMD_SCREENSHOT = "screenshot"
+
+# ---- 服务端 -> 客户端 事件 ----
+EVT_FILE = "file"
+EVT_CLIP = "clip"
+EVT_STATUS = "status"
+EVT_LOG = "log"
+EVT_FRAME = "frame"
+EVT_SCREEN_STOPPED = "screen_stopped"
+
+MEDIA_ACTIONS = {
+    "playpause": 0xB3,
+    "next": 0xB0,
+    "prev": 0xB1,
+    "stop": 0xB2,
+    "volup": 0xAF,
+    "voldown": 0xAE,
+    "mute": 0xAD,
+}
+
+POWER_ACTIONS = {"shutdown", "restart", "lock", "sleep", "abort"}
+
+# 手表端会用到的中文动作名（便于 UI 直接显示）
+MEDIA_LABELS = {
+    "playpause": "播放/暂停",
+    "next": "下一曲",
+    "prev": "上一曲",
+    "stop": "停止",
+    "volup": "音量+",
+    "voldown": "音量-",
+    "mute": "静音",
+}
+
+POWER_LABELS = {
+    "shutdown": "关机",
+    "restart": "重启",
+    "lock": "锁屏",
+    "sleep": "睡眠",
+    "abort": "取消关机",
+}
+
+
+def dumps(obj: dict) -> bytes:
+    """编码成一行 JSON（UTF-8 + 换行）。"""
+    return (json.dumps(obj, ensure_ascii=False, separators=(",", ":")) + "\n").encode("utf-8")
+
+
+def loads(line: bytes) -> dict:
+    """解析一行 JSON。"""
+    return json.loads(line.decode("utf-8", errors="replace").strip())
+
+
+def b64encode(data: bytes) -> str:
+    return base64.b64encode(data).decode("ascii")
+
+
+def b64decode(text: str) -> bytes:
+    return base64.b64decode(text.encode("ascii"))
+
+
+def chunk_bytes(data: bytes, size: int = CHUNK_SIZE):
+    """把字节流切成若干块，产出 (seq, is_last, chunk)。"""
+    if not data:
+        yield 0, True, b""
+        return
+    total = (len(data) + size - 1) // size
+    for index in range(total):
+        piece = data[index * size:(index + 1) * size]
+        yield index, index == total - 1, piece
+
+
+class ChunkTooLarge(Exception):
+    """分块累积超过上限，或顺序不对。"""
+
+
+class ChunkAssembler:
+    """接收端：按 seq 收集分块，拼回完整数据。
+
+    MAX_LINE_BYTES 只管单行，累积体积必须另外设上限 ——
+    否则已配对设备可以一直发 chunk 把内存吃干（最后 bytes() 还要再翻一倍）。
+    """
+
+    def __init__(self, limit: int = MAX_TOTAL_BYTES):
+        self._buf = bytearray()
+        self._expected = 0
+        self._limit = int(limit)
+
+    def feed(self, seq: int, is_last: bool, data: bytes) -> bytes | None:
+        """返回完整数据（当收到最后一块时），否则 None。
+
+        顺序不对或超限时抛 ChunkTooLarge，不静默拼出坏文件。
+        """
+        if seq == 0:
+            self._buf = bytearray()
+            self._expected = 0
+        if seq != self._expected:
+            self._buf = bytearray()
+            self._expected = 0
+            raise ChunkTooLarge(
+                f"分块顺序不对（收到 {seq}，应为 {self._expected}）")
+        if len(self._buf) + len(data) > self._limit:
+            self._buf = bytearray()
+            self._expected = 0
+            raise ChunkTooLarge(f"文件超过上限（{self._limit // 1048576} MB）")
+        self._buf.extend(data)
+        self._expected = seq + 1
+        if is_last:
+            result = bytes(self._buf)
+            self._buf = bytearray()
+            self._expected = 0
+            return result
+        return None
+
+    def reset(self) -> None:
+        self._buf = bytearray()
+        self._expected = 0