feat: 新增聊天导出与语音转录 CLI 脚本 (#57)
* feat: 新增聊天导出与语音转录 CLI 脚本
新增两个独立 CLI 脚本,用于将单个聊天导出为结构化 JSON、并批量
填充语音消息的 Whisper 转录。区别于 MCP 工具:这些脚本面向离线
导出/归档,适合一次性拉取大量消息,或在会话外喂给其他 LLM/索引
管线使用。
- export_chat.py:跨分片合并某个聊天的全部消息,按时间排序后输出
紧凑 JSON(type 为 text 时省略,is_group 仅群聊保留等)。复用
mcp_server 中的消息解析/发送者解析辅助函数。
- transcribe_chat.py:读入 export_chat.py 产出的 JSON,对所有尚
未转录的 voice 消息调用 Whisper,原地写回 transcription 字段。
幂等(已有 transcription 的消息跳过)、崩溃安全(每条写回一次
输出文件)。
- .gitignore:新增 *.json 通配,避免本地导出文件被误提交。
config.example.json 已被跟踪,不受影响。
修复:transcribe_chat.py 原先调用 _silk_to_wav 时缺少 local_id
参数(commit c149389 将 local_id 加入签名用于文件名唯一化),
本 PR 中已补齐。
* docs: 新增聊天导出 JSON 数据格式文档
新增 docs/chat_export_format.md,描述 export_chat.py 与
transcribe_chat.py 产出的 JSON schema:顶层字段、消息对象的必填/
可选字段、默认值省略规则,以及加载与过滤的 Python 示例。
与现有 docs/macos-*.md 指南风格一致,避免在脚本 docstring 中堆叠
大段表格。export_chat.py 的 docstring 加一行指针指向本文档。
* docs: 聊天导出格式文档翻译为中文
与 docs/macos-*.md 既有指南保持一致的语言风格,将
docs/chat_export_format.md 翻译为中文。JSON 字段名、Python
代码示例等技术标识保持英文不变。
* fix: 回应 PR #57 review — 崩溃处理、幂等性、schema 补全
根据 review (#57) 的反馈:
- export_chat.py: _resolve_chat_context 返回 None 时的崩溃改为友好
退出,并在 resolve 成功后打印 display_name (username),便于用户
核对 resolve_username 的模糊匹配结果。
- export_chat.py: _query_messages 的 limit=999999 改为 None,避免
超长历史被悄悄截断(_query_messages 对 None 会省略 LIMIT 子句)。
- export_chat.py: 输出 JSON 顶层新增 username 字段,让
transcribe_chat.py 可以跳过二次模糊匹配,避免同名联系人漂移。
- transcribe_chat.py: 优先读取 JSON 顶层的 username,旧导出文件
(无 username)回退到按 chat 名解析,保持向后兼容。
- transcribe_chat.py: 删除未使用的 import io / import wave,将循环
内的 import datetime 提至模块顶部。
- export_chat.py: _decode_sticker_desc 的 varint 单字节简化给出
注释说明局限,以及对 create_time 排序加 "or 0" 防御。
- export_chat.py / transcribe_chat.py: 模块 docstring 翻译为中文,
与 docs/macos-*.md 保持一致。
- docs/chat_export_format.md: 同步补充 username 字段说明。
- .gitignore: 将 *.json 收窄为 *_export*.json / *_transcribed*.json,
避免误屏蔽未来的 config/fixtures,同时匹配导出工具实际产出的
文件名。
This commit is contained in:
4
.gitignore
vendored
4
.gitignore
vendored
@@ -9,6 +9,10 @@ decoded_images/
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*.db-wal
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*.db.tmp_monitor
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# Chat export/transcription output files (contain private message data)
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*_export*.json
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*_transcribed*.json
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# Hook outputs
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hook_output.txt
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hook_start_output.txt
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97
docs/chat_export_format.md
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97
docs/chat_export_format.md
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@@ -0,0 +1,97 @@
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# 聊天导出 JSON 数据格式
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`export_chat.py` 与 `transcribe_chat.py` 生成的 JSON 文件采用紧凑格式:
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默认值与空值会被省略。本文档说明如何加载和解读这类文件。
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## 生成文件
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```bash
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.venv/bin/python3 export_chat.py <chat_name> [output.json]
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.venv/bin/python3 transcribe_chat.py <input.json> [output.json]
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```
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`export_chat.py` 负责原始导出;`transcribe_chat.py` 使用 Whisper(CPU)
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为语音消息填充转录文本。`transcribe_chat.py` 可重复运行 —— 已转录的
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消息会被跳过。
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## 顶层结构
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```json
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{
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"chat": "<display name>",
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"username": "<wxid 或 @chatroom>",
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"exported_at": "YYYY-MM-DD HH:MM:SS",
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"is_group": true,
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"messages": [ ... ]
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}
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```
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- `chat` —— 聊天的显示名(联系人名或群名)。
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- `username` —— 稳定的 WeChat 用户名(1-on-1 聊天为 `wxid_*`,群聊为 `*@chatroom`)。
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`transcribe_chat.py` 会优先读取本字段而非基于 `chat` 再次模糊匹配,避免同名联系人漂移。
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- `exported_at` —— 本地时间字符串,仅作溯源用途。
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- `is_group` —— **仅**群聊出现且为 `true`;1-on-1 聊天时省略。
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- `messages` —— 消息数组,跨所有 DB 分片按时间由旧到新排序。
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消息条数 = `len(messages)`,没有 `total` 字段。
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## 消息对象
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每条消息必有三个字段:`local_id`、`timestamp`、`sender`。
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其余字段均为**可选**,当值为默认值或 null 时会被省略。
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| 字段 | 类型 | 必填 | 含义 / 缺失时的默认值 |
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| --------------- | ------ | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `local_id` | int | 是 | WeChat 内该聊天的稳定行 ID。用于重跑转录或对比导出时的消息匹配。 |
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| `timestamp` | int | 是 | Unix 时间戳(秒级,本地时间已换算为秒)。通过 `datetime.fromtimestamp(ts)` 转换。 |
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| `sender` | string | 是 | `"me"` 代表当前登录用户;否则为发送者的显示名 —— 1-on-1 聊天中是联系人名,群聊中是群成员名。对于无法归属的消息(如系统通知)为 `""`。 |
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| `type` | string | 否 | 消息类型。**缺失时视为 `"text"`**。已知取值:`text`、`image`、`voice`、`sticker`、`video`、`link_or_file`、`call`、`system`、`recall`、`contact_card`、`location`。 |
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| `content` | string | 否 | 消息的渲染文本。当没有可提取内容时省略(例如部分图片 / 通话 / 系统事件)。 |
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| `transcription` | string | 否 | **仅**在 `type: "voice"` 且已完成转录的消息上出现。若 Whisper 未产出文本可能为空串 `""`。 |
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## 加载示例
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带默认值的遍历:
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```python
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import json
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from datetime import datetime
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with open("chat_export_transcribed.json") as f:
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data = json.load(f)
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is_group = data.get("is_group", False)
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for m in data["messages"]:
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mtype = m.get("type", "text")
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when = datetime.fromtimestamp(m["timestamp"])
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sender = m["sender"] # "me" | 联系人/群成员名 | ""
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text = m.get("content", "")
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if mtype == "voice":
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text = m.get("transcription") or "[voice, untranscribed]"
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print(f"[{when:%Y-%m-%d %H:%M}] {sender or '(system)'}: {text}")
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```
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判断消息是否由自己发出:
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```python
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from_me = m["sender"] == "me"
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```
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筛选仍需转录的语音消息:
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```python
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pending = [m for m in data["messages"]
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if m.get("type") == "voice" and not m.get("transcription")]
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```
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## 解读注意事项
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- **系统消息**(`type: "system"`)的 `sender` 为 `""` —— 不属于任何人。
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常见内容:撤回通知("X 撤回了一条消息")、添加好友事件等。
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- **空转录**(`transcription: ""`)表示 Whisper 已经运行但未产出文本,
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通常是极短或静音片段。这与"尚未转录"(字段缺失)是不同的状态。
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- **非文本消息的 `content`** 是渲染摘要:`[视频] 12秒`、`[表情] 哈哈`、
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`[图片]` 等。原始媒体仍在 WeChat DB 中,可用 `mcp_server.py` 中的
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辅助函数(`decode_image`、`decode_voice`)取出。
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- **群聊**中的 `sender` 是群成员解析后的显示名;当前登录用户仍为 `"me"`。
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249
export_chat.py
Normal file
249
export_chat.py
Normal file
@@ -0,0 +1,249 @@
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"""
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将单个聊天的全部消息导出为 JSON。
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用法:
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.venv/bin/python3 export_chat.py <chat_name> [output.json]
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参数:
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<chat_name> 联系人显示名、备注名、群名或 wxid。
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[output.json] 可选输出路径,默认 "<chat_name>_export.json"。
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示例:
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.venv/bin/python3 export_chat.py <contact_name>
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.venv/bin/python3 export_chat.py <group_name> /tmp/out.json
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输出 JSON 的紧凑结构:
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{
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"chat": "<display name>",
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"username": "<wxid 或 @chatroom>",
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"exported_at": "YYYY-MM-DD HH:MM:SS",
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"is_group": true, // 仅群聊出现
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"messages": [
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{"local_id": 1, "timestamp": 1713..., "sender": "me", "content": "..."},
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{"local_id": 2, "timestamp": 1713..., "sender": "<name>", "type": "voice"}
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]
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}
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默认值/空值会被省略: text 消息省略 "type",无可提取内容时省略 "content",
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1-on-1 聊天省略 "is_group"。
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语音消息以 type "voice" 导出且不带 transcription 字段;运行
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transcribe_chat.py 可用 Whisper 补齐转录。
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需先完成 WeChat DB 解密(详见 README)。
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完整 schema、字段语义与加载示例: docs/chat_export_format.md
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"""
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import json
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import sqlite3
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import sys
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from contextlib import closing
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from datetime import datetime
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import mcp_server
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MSG_TYPE_MAP = {
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1: "text",
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3: "image",
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34: "voice",
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42: "contact_card",
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43: "video",
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47: "sticker",
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48: "location",
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49: "link_or_file",
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50: "call",
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10000: "system",
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10002: "recall",
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}
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def _msg_type_str(local_type):
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base, _ = mcp_server._split_msg_type(local_type)
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return MSG_TYPE_MAP.get(base, f"type_{local_type}")
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def _resolve_sender(row, ctx, names, id_to_username):
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"""Resolve the sender of a message.
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Returns "me" for the logged-in user, or the sender's display name otherwise
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(the contact's name in 1-on-1 chats, the member's name in groups). Empty
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string for unattributable messages (e.g. system notifications).
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"""
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local_id, local_type, create_time, real_sender_id, content, ct = row
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decoded = mcp_server._decompress_content(content, ct)
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sender_from_content, _ = mcp_server._format_message_text(
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local_id, local_type, decoded, ctx["is_group"], ctx["username"], ctx["display_name"], names
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)
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label = mcp_server._resolve_sender_label(
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real_sender_id,
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sender_from_content,
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ctx["is_group"],
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ctx["username"],
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ctx["display_name"],
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names,
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id_to_username,
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)
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return label or ""
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def _decode_sticker_desc(b64_desc):
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"""WeChat encodes sticker labels as base64 protobuf: repeated (lang, text) pairs.
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Returns the 'default' language label (usually Chinese), or None.
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Limitation: treats the length byte as a single octet rather than a real protobuf
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varint — labels >127 bytes would be misread. In practice sticker descriptions are
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short (<30 chars), so this is adequate. Also sensitive to the bytes b"default"
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appearing inside a preceding value; no such cases observed.
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"""
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import base64
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try:
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raw = base64.b64decode(b64_desc)
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except Exception:
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return None
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# Find the 'default' marker; text follows as: \x12 <varint len> <utf-8>
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i = raw.find(b"default")
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if i < 0 or i + 7 >= len(raw) or raw[i + 7] != 0x12:
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return None
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try:
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text_len = raw[i + 8]
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text_bytes = raw[i + 9 : i + 9 + text_len]
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return text_bytes.decode("utf-8") or None
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except (IndexError, UnicodeDecodeError):
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return None
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def _format_sticker_message(content):
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root = mcp_server._parse_xml_root(content) if content else None
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if root is None:
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return "[表情]"
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emoji = root.find(".//emoji")
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if emoji is None:
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return "[表情]"
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desc = emoji.get("desc") or ""
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label = _decode_sticker_desc(desc) if desc else None
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return f"[表情] {label}" if label else "[表情]"
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def _format_system_message(content):
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if not content:
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return "[系统消息]"
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if "<sysmsg" not in content:
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return content
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root = mcp_server._parse_xml_root(content)
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if root is None:
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return content
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inner = root.findtext(".//content")
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return inner.strip() if inner else content
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def _format_video_message(content):
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root = mcp_server._parse_xml_root(content) if content else None
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if root is None:
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return "[视频]"
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video = root.find(".//videomsg")
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if video is None:
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return "[视频]"
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playlength = video.get("playlength")
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return f"[视频] {playlength}秒" if playlength else "[视频]"
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def _extract_content(local_id, local_type, content, ct, chat_username, chat_display_name):
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content = mcp_server._decompress_content(content, ct)
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if content is None:
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return None
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base, _ = mcp_server._split_msg_type(local_type)
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if base == 1:
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return content or ""
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if base == 43:
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return _format_video_message(content)
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if base == 47:
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return _format_sticker_message(content)
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if base == 49:
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return mcp_server._format_app_message_text(
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content, local_type, False, chat_username, chat_display_name, {}
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)
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if base == 50:
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return mcp_server._format_voip_message_text(content)
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if base == 10000:
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return _format_system_message(content)
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if base == 10002:
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return "[撤回消息]"
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return None
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def export_chat(chat_name, output_path):
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ctx = mcp_server._resolve_chat_context(chat_name)
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if ctx is None:
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print(f"Could not resolve chat: {chat_name}")
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sys.exit(1)
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username = ctx["username"]
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display_name = ctx["display_name"]
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# resolve_username 对模糊匹配会静默选第一个命中,打印一下便于用户核对。
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print(f"Resolved to: {display_name} ({username})")
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if not ctx["message_tables"]:
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print(f"No message tables found for {username}")
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sys.exit(1)
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names = mcp_server.get_contact_names()
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# Each shard has its own Name2Id table, so we must pair rows with the
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# id_to_username map from their source DB.
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all_rows = []
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for table_info in ctx["message_tables"]:
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db_path = table_info["db_path"]
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table_name = table_info["table_name"]
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with closing(sqlite3.connect(db_path)) as conn:
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id_to_username = mcp_server._load_name2id_maps(conn)
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rows = mcp_server._query_messages(conn, table_name, limit=None, oldest_first=True)
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for row in rows:
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all_rows.append((row, id_to_username))
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# Sort across shards by create_time (defensive "or 0" in case a row has NULL).
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all_rows.sort(key=lambda pair: pair[0][2] or 0)
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messages = []
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for row, id_to_username in all_rows:
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local_id, local_type, create_time, real_sender_id, content, ct = row
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sender = _resolve_sender(row, ctx, names, id_to_username)
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type_str = _msg_type_str(local_type)
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rendered = _extract_content(local_id, local_type, content, ct, username, display_name)
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# Compact format: omit defaults/nulls. type defaults to "text", transcription
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# is added later by transcribe_chat.py only for voice messages. See CLAUDE.md.
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msg = {
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"local_id": local_id,
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"timestamp": create_time,
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"sender": sender,
|
||||
}
|
||||
if type_str != "text":
|
||||
msg["type"] = type_str
|
||||
if rendered is not None:
|
||||
msg["content"] = rendered
|
||||
messages.append(msg)
|
||||
|
||||
output = {
|
||||
"chat": display_name,
|
||||
"username": username,
|
||||
"exported_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
|
||||
"messages": messages,
|
||||
}
|
||||
if ctx["is_group"]:
|
||||
output["is_group"] = True
|
||||
|
||||
with open(output_path, "w", encoding="utf-8") as f:
|
||||
json.dump(output, f, ensure_ascii=False, indent=2)
|
||||
|
||||
print(f"Exported {len(messages)} messages to {output_path}")
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
if len(sys.argv) < 2:
|
||||
print("Usage: python3 export_chat.py <chat_name> [output.json]")
|
||||
sys.exit(1)
|
||||
chat = sys.argv[1]
|
||||
out = sys.argv[2] if len(sys.argv) > 2 else f"{chat}_export.json"
|
||||
export_chat(chat, out)
|
||||
102
transcribe_chat.py
Normal file
102
transcribe_chat.py
Normal file
@@ -0,0 +1,102 @@
|
||||
"""
|
||||
为聊天导出 JSON 中的语音消息补齐转录文本。
|
||||
|
||||
用法:
|
||||
.venv/bin/python3 transcribe_chat.py <input.json> [output.json]
|
||||
|
||||
参数:
|
||||
<input.json> 由 export_chat.py 产出的 JSON。
|
||||
[output.json] 可选输出路径,默认 "<input>_transcribed.json"。
|
||||
|
||||
完整流程示例:
|
||||
.venv/bin/python3 export_chat.py <chat_name> /tmp/chat.json
|
||||
.venv/bin/python3 transcribe_chat.py /tmp/chat.json /tmp/chat_transcribed.json
|
||||
|
||||
行为说明:
|
||||
- 使用 OpenAI Whisper (CPU,单线程) 对每条语音消息转录。
|
||||
- 幂等: 已有 "transcription" 字段的消息会被跳过,因此崩溃/中断后可安全重跑。
|
||||
- 崩溃安全: 每处理完一条即整体重写输出 JSON,进程中断最多丢失当前一条。
|
||||
- 首次运行会下载 Whisper 模型 (~145 MB) 并缓存。
|
||||
|
||||
需要 WeChat DB 仍然在线/已解密 —— 语音 blob 是从 DB 现场按 local_id 读取的,
|
||||
不从 JSON 读。
|
||||
"""
|
||||
import json
|
||||
import os
|
||||
import sys
|
||||
from datetime import datetime
|
||||
|
||||
import mcp_server
|
||||
|
||||
|
||||
def _transcribe_local_id(username, local_id):
|
||||
row = mcp_server._fetch_voice_row(username, local_id)
|
||||
if row is None:
|
||||
return "[not found]"
|
||||
|
||||
voice_data, create_time = row
|
||||
try:
|
||||
wav_path, _ = mcp_server._silk_to_wav(voice_data, create_time, username, local_id)
|
||||
except Exception as e:
|
||||
return f"[decode error: {e}]"
|
||||
|
||||
try:
|
||||
model = mcp_server._get_whisper_model()
|
||||
result = model.transcribe(wav_path)
|
||||
return result.get("text", "").strip()
|
||||
except Exception as e:
|
||||
return f"[transcribe error: {e}]"
|
||||
|
||||
|
||||
def transcribe_export(input_path, output_path):
|
||||
with open(input_path, encoding="utf-8") as f:
|
||||
data = json.load(f)
|
||||
|
||||
# 优先使用导出 JSON 中已记录的 username,避免重新模糊匹配导致同名联系人漂移。
|
||||
username = data.get("username")
|
||||
chat_name = data.get("chat", "")
|
||||
if not username:
|
||||
username = mcp_server.resolve_username(chat_name)
|
||||
if not username:
|
||||
print(f"Could not resolve username for: {chat_name}")
|
||||
sys.exit(1)
|
||||
|
||||
messages = data["messages"]
|
||||
# Compact format: type is absent for text; transcription is only present when filled.
|
||||
pending = [m for m in messages if m.get("type") == "voice" and not m.get("transcription")]
|
||||
total = len(pending)
|
||||
|
||||
if total == 0:
|
||||
print("No voice messages to transcribe.")
|
||||
return
|
||||
|
||||
print(f"Found {total} voice messages to transcribe.")
|
||||
print("Loading Whisper model (first run downloads ~145MB)...")
|
||||
mcp_server._get_whisper_model()
|
||||
print("Model ready.\n")
|
||||
|
||||
for i, msg in enumerate(pending, 1):
|
||||
local_id = msg["local_id"]
|
||||
ts = msg["timestamp"]
|
||||
ts_str = datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M:%S") if isinstance(ts, (int, float)) else ts
|
||||
print(f"[{i}/{total}] local_id={local_id} ({ts_str}) ... ", end="", flush=True)
|
||||
result = _transcribe_local_id(username, local_id)
|
||||
msg["transcription"] = result
|
||||
print(repr(result[:60]) if result else '""')
|
||||
|
||||
# Save after each transcription so progress isn't lost on crash
|
||||
with open(output_path, "w", encoding="utf-8") as f:
|
||||
json.dump(data, f, ensure_ascii=False, indent=2)
|
||||
|
||||
print(f"\nDone. Written to {output_path}")
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
if len(sys.argv) < 2:
|
||||
print("Usage: python3 transcribe_chat.py <input.json> [output.json]")
|
||||
sys.exit(1)
|
||||
|
||||
inp = sys.argv[1]
|
||||
base, ext = os.path.splitext(inp)
|
||||
out = sys.argv[2] if len(sys.argv) > 2 else f"{base}_transcribed{ext}"
|
||||
transcribe_export(inp, out)
|
||||
Reference in New Issue
Block a user