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254 lines
10 KiB
JavaScript
254 lines
10 KiB
JavaScript
/**
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* @dsh-local/workspace-scoped-picker — 会话内工作区目录选择器（根 = 用户自有目录）。
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*
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* 档案 18：官方 `dsh-host-directory-picker-browse` 的策略是 whole-filesystem scope
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* （向导 /etc、/usr、/proc），本包把 enumerate/create 的根收敛为「当前用户自有目录」，
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* **所有用户含 admin 一视同仁**；越界一律抛 seam 的封闭错误码。
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*
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* 根解析优先级：`process.env.DSH_WORKSPACE_ROOT` → `process.cwd()`
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* （编排器 spawn 时以 `--chdir <userRoot>/ws` 启动，故 cwd 即用户工作区，双保险）。
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*
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* 依赖策略（红线 R2：不复制、不修改官方包）：
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* 唯一需要官方物 = seam 基类；用**绝对路径动态 import** 取得，解析到与核心同一个模块实例
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* （ESM 模块缓存按 realpath 去重）。可选 env `DSH_SEAM_DIRECTORY_PICKER` 指定路径。
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*
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* 官方契约（对齐 `dsh-host-directory-picker` 类型定义 与 `-browse` 实现）：
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* - 默认导出 = 继承 `DirectoryPicker` 的 Service 子类；加载即注册 `ctx.directoryPicker`
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* - `capability()` 返回稳定对象：`{ kind: 'browse', list(path?, signal?), createDirectory(path, name) }`
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* - 列举只返回**目录**行，按名排序，跟随指向目录的符号链接，`hidden` = 点号前缀
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* - `crumbs` = 祖先链（本实现以自有根为顶层，而不是文件系统 /）
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* - 错误码封闭：`directory-unreadable` / `directory-exists` / `directory-create-failed`
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*
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* @module @dsh-local/workspace-scoped-picker
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*/
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import { mkdir, opendir, realpath, stat } from 'node:fs/promises'
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import { basename, dirname, isAbsolute, join, resolve, sep } from 'node:path'
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import { pathToFileURL } from 'node:url'
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/** 单个列举层级的行数上限（与官方后端同为 GitHub 风格 1000）。 */
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const MAX_ENTRIES = 1000
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/** 官方 seam 基类的候选绝对路径（按序尝试首个可导入者）。 */
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const DEFAULT_SEAM_CANDIDATES = [
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'/usr/local/lib/node_modules/@deepseek-ai/dsh/node_modules/@deepseek-ai/dsh-host-directory-picker/lib/index.js',
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'/usr/local/lib/node_modules/@deepseek-ai/dsh-host-directory-picker/lib/index.js',
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]
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/** 解析并导入官方 seam 基类。 */
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async function loadSeam() {
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const candidates = []
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const override = process.env.DSH_SEAM_DIRECTORY_PICKER
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if (override !== undefined && override !== '') candidates.push(override)
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candidates.push(...DEFAULT_SEAM_CANDIDATES)
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const failures = []
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for (const candidate of candidates) {
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try {
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const mod = await import(pathToFileURL(candidate).href)
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if (typeof mod.DirectoryPicker !== 'function') throw new Error('seam module has no DirectoryPicker export')
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return mod
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} catch (error) {
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failures.push(`${candidate}: ${error instanceof Error ? error.message : String(error)}`)
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}
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}
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throw new Error(
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`workspace-scoped-picker: 无法解析官方 seam 基类（@deepseek-ai/dsh-host-directory-picker）。已尝试：\n ${failures.join('\n ')}\n` +
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'可通过环境变量 DSH_SEAM_DIRECTORY_PICKER 指定该包 lib/index.js 的绝对路径。',
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)
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}
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const { DirectoryPicker, DirectoryPickerError } = await loadSeam()
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/** 单段目录名校验（不得含分隔符，不得为 . / ..）。 */
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function isSingleSegment(name) {
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return name.trim() !== '' && name !== '.' && name !== '..' && !name.includes('/') && !name.includes('\\')
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}
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/**
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* 自有目录作用域内的目录选择服务。
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* 范围语义：`list()` 的根 = 自有目录；向上不可越界；`crumbs` 顶层即自有目录。
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*/
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class WorkspaceScopedDirectoryPicker extends DirectoryPicker {
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/** 自有根（绝对路径）。 */
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root = resolve(process.env.DSH_WORKSPACE_ROOT ?? process.cwd())
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/** 稳定的 browse 能力对象（consumers 可能跨调用缓存它）。 */
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browseCapability = {
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kind: 'browse',
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list: (path, signal) => this.list(path, signal),
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createDirectory: (path, name) => this.createDirectory(path, name),
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}
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/** @param ctx - cordis 上下文（由 loader 注入）。 */
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constructor(ctx) {
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super(ctx)
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// 加载标记：实例启动日志里可直接确认本插件是否生效（排障用，2026-09-11）。
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process.stderr.write(
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`[workspace-scoped-picker] loaded root=${this.root} (${process.env.DSH_WORKSPACE_ROOT !== undefined ? 'env' : 'cwd'})\n`,
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)
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}
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/** @returns 稳定的 `browse` 能力对象。 */
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capability() {
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return this.browseCapability
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}
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/** 自有根（含符号链接解析后的真实路径）。 */
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async realRoot() {
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try {
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return await realpath(this.root)
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} catch {
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return this.root
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}
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}
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/**
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* 校验候选路径落在自有根之内（先词法归一，再 realpath 抗符号链接逃逸）。
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* 注：用普通方法而非 `#私有字段`——服务实例可能被框架 Proxy 包装，私有 brand 检查会失败。
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* @param candidate - 待校验的绝对路径。
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* @param code - 校验失败时抛出的封闭错误码。
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* @returns 归一后的绝对路径。
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*/
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async assertInside(candidate, code) {
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if (typeof candidate !== 'string' || !isAbsolute(candidate)) {
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throw new DirectoryPickerError(code, String(candidate), `not a fully qualified path: ${String(candidate)}`)
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}
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const target = resolve(candidate)
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const realRoot = await this.realRoot()
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const lexicalOk = target === realRoot || target.startsWith(realRoot.endsWith(sep) ? realRoot : realRoot + sep)
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if (!lexicalOk) {
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throw new DirectoryPickerError(code, target, `outside the workspace root: ${target}`)
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}
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// 抗符号链接：若目标已存在，比较真实路径；不存在则沿用词法判定（调用方随后会自然失败）。
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try {
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const realTarget = await realpath(target)
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const inside =
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realTarget === realRoot || realTarget.startsWith(realRoot.endsWith(sep) ? realRoot : realRoot + sep)
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if (!inside) throw new DirectoryPickerError(code, target, `symlink escapes the workspace root: ${target}`)
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} catch (error) {
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if (error instanceof DirectoryPickerError) throw error
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// ENOENT：目标不存在，交由上层语义处理（列举会报 directory-unreadable）。
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}
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return target
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}
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/**
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* 自有根到目标（含）的祖先链，顶层即自有根 —— crumbs 不暴露文件系统 /。
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* 顶层用**友好名**（默认「我的工作区」，可用 DSH_WORKSPACE_LABEL 覆盖），
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* 不在 UI 上展示 `/var/lib/.../users/<uuid>/ws` 这类完整路径（档案 24 后续项）。
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*/
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crumbs(target) {
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const rootLabel = process.env.DSH_WORKSPACE_LABEL ?? '我的工作区'
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const chain = []
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let current = target
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for (;;) {
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chain.unshift({
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name: current === this.root ? rootLabel : basename(current),
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path: current,
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hidden: false,
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})
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if (current === this.root) return chain
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const parent = dirname(current)
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if (parent === current) return chain // 兜底：理论不可达（越界已在入口拦截）
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current = parent
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}
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}
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/**
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* 列举自有根内的一层目录。
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* @param path - 省略时列举自有根。
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* @param signal - 可选中止信号。
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* @returns 列举结果（`home` 锚点为自有根）。
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*/
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async list(path, signal) {
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const target = path === undefined ? this.root : await this.assertInside(path, 'directory-unreadable')
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let dir
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try {
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dir = await opendir(target)
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} catch (error) {
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throw new DirectoryPickerError(
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'directory-unreadable',
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target,
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`cannot list ${target}: ${error instanceof Error ? error.message : String(error)}`,
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)
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}
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const names = []
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let truncated = false
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try {
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for await (const entry of dir) {
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if (signal?.aborted === true) throw new DirectoryPickerError('directory-unreadable', target, 'aborted')
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if (names.length >= MAX_ENTRIES) {
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truncated = true
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break
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}
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if (!entry.isDirectory() && !entry.isSymbolicLink()) continue
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const child = join(target, entry.name)
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if (entry.isSymbolicLink()) {
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// 与官方后端一致：跟随指向目录的符号链接；断链/指向文件则跳过。
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try {
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const st = await stat(child)
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if (!st.isDirectory()) continue
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} catch {
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continue
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}
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}
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// 符号链接目标也必须留在自有根内，否则不展示（避免借链接越界浏览）。
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try {
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await this.assertInside(child, 'directory-unreadable')
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} catch {
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continue
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}
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names.push(entry.name)
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}
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} finally {
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await dir.close().catch(() => undefined)
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}
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names.sort((a, b) => a.localeCompare(b))
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return {
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path: target,
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home: this.root,
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crumbs: this.crumbs(target),
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entries: names.map((name) => ({
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name,
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path: join(target, name),
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hidden: name.startsWith('.'),
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})),
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truncated,
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}
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}
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/**
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* 在自有根内的既有父目录下创建单层子目录。
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* @param path - 父目录（省略时用自有根）。
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* @param name - 单个路径段。
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* @returns 新目录的绝对路径。
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*/
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async createDirectory(path, name) {
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const parent = path === undefined || path === '' ? this.root : await this.assertInside(path, 'directory-create-failed')
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if (typeof name !== 'string' || !isSingleSegment(name)) {
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throw new DirectoryPickerError(
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'directory-create-failed',
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join(parent, String(name)),
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`"${String(name)}" is not a single path segment`,
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)
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}
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const target = join(parent, name)
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await this.assertInside(target, 'directory-create-failed')
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try {
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await mkdir(target)
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return target
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} catch (error) {
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const code = error instanceof Error && 'code' in error ? error.code : undefined
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if (code === 'EEXIST') throw new DirectoryPickerError('directory-exists', target, `${target} already exists`)
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throw new DirectoryPickerError(
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'directory-create-failed',
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target,
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`cannot create ${target}: ${error instanceof Error ? error.message : String(error)}`,
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)
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}
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}
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}
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export { WorkspaceScopedDirectoryPicker, isSingleSegment }
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export default WorkspaceScopedDirectoryPicker
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