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-# Groups Refactor — Per-Root Permissions & App Plugin Architecture
-
-> **Superseded by `MESHBAY_DESIGN.md`.** This was the roots and app-settings refactor; its design
-> content now lives in §6.2 (RO/RW, eject), §9.3 (enablement and settings).
->
-> It is kept because code comments, tests and other documents cite its
-> sections and its labels, and because it records reasoning a synthesis
-> compresses. **Where it disagrees with `MESHBAY_DESIGN.md`, the design
-> document is right; where either disagrees with the code, the code is.**
-> `MESHBAY_DESIGN.md` §16 maps every section reference here onto its
-> replacement, and §13 defines every label.
-
-> Status: **Complete** (2026-09-07). All three phases built, reviewed and
-> tested against a running node.
->
-> This is the most significant refactoring of the project. It changes how roots
-> are permissioned, how group applications are configured, and how the Settings
-> and Create Group pages are structured.
->
-> §7b, §7c and §7d record what each phase's review found and where the plan
-> below was wrong. Several entries are rules rather than one-off fixes; §7d
-> also lists what a person still has to test by hand.
-
----
-
-## 0. Summary of changes
-
-| Area | Before | After |
-|---|---|---|
-| Root permissions | One root marked `upload=True`; binary `member_upload` toggle per group | Each root is **RO** (default) or **RW**; multiple RW roots allowed; fully RO group is valid |
-| Upload policy | Separate section in Settings; `member_upload` signed op | **Removed.** RO/RW on the root is the mechanism. Files shows Upload only on RW roots. Chat disables attachments when its configured directory is not on a RW root |
-| Root metadata | `name, path, kind, upload, direct` | `name, path, kind, writable, removable, direct` |
-| Removable flag | Not tracked | Per-root boolean, set by operator. Enables the **eject/plug** button for safe device removal |
-| Safe eject | Auto-detected only (`path.is_dir()`) | Operator-initiated eject button in Settings AND Files root view. `ejected` state distinct from `available`. Indexer freezes entries, no data loss |
-| Files app | Can be disabled | **Always enabled**, transparently. Not shown in the app toggle list |
-| App selection at group creation | Checkbox list of all apps | **Removed.** Files is enabled automatically; other apps are configured later in Settings |
-| Settings layout | Monolithic: apps checkboxes, TMDB, MusicBrainz, directories, uploads — all in `group-settings.js` | **Structured:** Shared directories (top, expanded) → per-app sections (each with toggle + icon + title, collapsed, settings hidden until enabled) → Scan/Danger/Devices/Members |
-| App settings code | All inlined in `group-settings.js` (1338 lines) | Each app has `ui/<APP_NAME>-app-settings.js`; loaded by discovery (presence of the file) |
-| App enablement UI | One "Applications" section with checkboxes | Each app is a collapsible section with its own toggle in the title. The toggle is the enablement control |
-| Folder picker | Flat `<select>` with depth-indented names | **Folder tree popup**: modal, root icons, `[+]` expand, sub-directory selection |
-| Server-side app ops | Per-app functions in `ops.py` (`set_video_root`, `set_audio_root`, `set_photo_roots`, ...) | Generic `set_app_directory()` / `set_app_directories()` + app-specific wrappers where needed |
-| CLI | `group add --dir --upload-dir`; `member upload` concept | `group add --dir [--writable]`; `root add/remove/set` with `--writable`/`--read-only`/`--removable` |
-| MNP | 1.0 | 1.1 (additive: new fields on roots, new generic app-directory messages). 1.0 peers still work |
-
----
-
-## 1. Design decisions
-
-### 1.1 RO/RW replaces upload + member_upload
-
-The current model has two orthogonal mechanisms: (a) one root is the upload target,
-(b) `member_upload` toggles whether non-operators can upload there. The new model
-collapses both into one property per root: **writable**.
-
-- `writable = false` (default): the root is read-only for everyone, including the
- operator via the UI. Content is placed there out-of-band (filesystem, rsync, USB).
-- `writable = true`: any group member may upload to this root (into the quarantine
- subdirectory, same protections as today — allowlist, no overwrite, size cap).
-
-Multiple roots can be writable. Zero can be writable (fully read-only group). The
-operator controls which roots are RW by toggling a switch in the shared directories
-table.
-
-**What this removes:**
-- The `member_upload` toggle and its `OP_MEMBER_UPLOAD` signed op
-- The `member_upload` / `member_upload_ack` MNP message types (deprecated, still
- parsed for backward compat)
-- The Uploads section in Settings
-- The concept of "the upload root" (singular)
-
-**What this preserves:**
-- The quarantine directory, filename allowlist, no-overwrite check, size cap
-- The `_do_file_upload` handler in `webrtc_server.py` — now checks `writable` on
- the target root instead of checking `upload` + `member_upload`
-- The operator's ability to create a read-only group (set all roots RO)
-
-### 1.2 Files is always enabled
-
-`files` is removed from the toggleable app list. It is always present in
-`enabled_apps` and cannot be disabled. The current ability to hide it was misleading:
-MNP still permits root exploration regardless. The tab bar always shows Files.
-
-`apps.js` keeps `files` in `APPS` but marks it `alwaysEnabled: true`. The Settings
-page skips it when rendering app toggle sections.
-
-### 1.3 Per-app settings files
-
-Each app that has configurable settings exports a settings component from
-`ui/<APP_NAME>-app-settings.js`. The file is optional — an app with no settings
-(like Files today) has no settings file and gets only a toggle.
-
-The `APPS` registry in `apps.js` gains an optional `Settings` field per entry,
-imported from the corresponding settings file. The group-settings page iterates
-`APPS`, skips `files`, and renders a collapsible section for each, with:
-
-- The app's monochrome icon + localized title in the section header
-- A toggle switch in the header (disabled by default)
-- The app's `Settings` component below, **hidden until the toggle is on**
-- A Save button per app section (some saves trigger caching — TMDB, MusicBrainz)
-
-**Discovery mechanism:** In the browser context, "file discovery" is registration in
-`apps.js`. Adding a new app means: write `<APP>-app.js` + `<APP>-app-settings.js`,
-add one entry to `APPS` in `apps.js`, add the key to `ALLOWED_APPS` on the node.
-Server-side enforcement via `ALLOWED_APPS` prevents client-side hacks from enabling
-an unrecognized app.
-
-### 1.4 Folder tree widget
-
-A reusable modal popup (`FolderTreePicker`) that:
-
-- Appears centered on screen, semi-transparent backdrop
-- Lists root directories at the top level, with the same folder icons as Files
-- Each root can be expanded via `[+]` / collapsed via `[-]`, explorer-tree style
-- Sub-directories load from the existing `nodeDirs` data (already available from the
- file index, no new endpoint needed)
-- Supports **single-select** mode (Chat) and **multi-select** mode (Videos, Music,
- Photos)
-- Shows the root's RO/RW badge next to each root name
-- For apps that require RW (Chat): RO roots and their children are greyed out /
- unselectable, with a tooltip explaining why
-- OK / Cancel buttons at the bottom
-- Returns the selected path(s) relative to the root (e.g., `Movies/Action`)
-
-The widget replaces the current flat `<select>` dropdowns in all app settings. It is
-also usable in other UI contexts (the video player's folder navigation already does
-something similar ad-hoc).
-
-### 1.5 Shared directories table
-
-A reusable component (`SharedDirectoriesTable`) used in both the group Settings page
-and the Create Group wizard (developed once, shared). Features:
-
-- Borderless table, one row per root
-- Columns: **Name** (with folder icon), **Path** (truncated with tooltip on hover),
- **RW toggle** (switch, default off), **Removable toggle** (checkbox),
- **Eject/Plug button** (visible only when removable is checked — see §1.5b),
- **Delete button** (trash icon, with confirmation)
-- Ejected roots show a distinct visual state: greyed-out row, eject icon replaced by
- a plug icon
-- The first root in the Create Group wizard defaults to RW
-- A concise explanatory sentence at the top: "At least one directory is required.
- Read-write directories accept uploads from group members."
-- Add button: opens the native folder picker (Electron) or a path input (web, admin
- only)
-- Cannot delete the last root (refused with explanation)
-- Each change is a signed operator op (`ROOT_ADD`, `ROOT_REMOVE`, or new
- `ROOT_UPDATE` for toggling writable/removable on an existing root)
-
-### 1.5b Safe eject for removable devices
-
-**Problem.** An operator stores data on a USB drive. Unplugging it without warning
-triggers the watchdog — file deletions propagate as though the operator erased an
-entire library. The existing `refresh_availability()` auto-detects this and freezes
-entries (good), but there is no way to eject cleanly before unplugging, and no way
-to re-plug without a full rescan.
-
-**The `ejected` state.** A root has two independent runtime states:
-
-- `ejected` (bool, default `false`): operator-controlled, persisted in `roster.db`.
- Set by clicking the eject button; cleared by clicking plug.
-- `available` (bool, runtime): computed as `not ejected and is_live()`. This is
- what clients and the indexer see.
-
-The distinction matters: when the operator clicks "eject" but hasn't physically
-unplugged yet, `is_live()` returns `true` but `available` is `false` because
-`ejected` is `true`. Without this, `refresh_availability()` would immediately
-flip it back to available.
-
-**Eject flow:**
-
-1. Operator clicks the eject button (⏏) on a removable root
-2. Confirmation dialog: "Eject *Movies*? Files from this directory will be
- temporarily hidden to all members. You can safely unplug the device."
-3. On confirm: `PUT /api/groups/{gid}/roots/{name}/eject` → `ops.eject_root()`
-4. `ops.eject_root()`: sets `ejected = true` in `roster.db`, marks root
- `available = false`, stops the watchdog observer for that root
-5. The indexer **freezes** all entries from that root (existing behavior — no
- deletions, no index updates, cached data preserved)
-6. `index_sync` update propagates to connected peers: the root's `available` is
- now `false`
-7. All apps filter out entries from unavailable roots (Files already does this
- partially — needs to be complete across Videos, Music, Photos)
-8. The operator can now safely unplug the device
-
-**Plug flow:**
-
-1. Operator plugs the device back in and clicks the plug button (🔌)
-2. `PUT /api/groups/{gid}/roots/{name}/plug` → `ops.plug_root()`
-3. `ops.plug_root()`: checks `is_live()` first — if the path is not accessible,
- refuses with "Directory not found. Is the device connected?"
-4. On success: sets `ejected = false`, marks root `available = true`, restarts
- the watchdog observer
-5. The indexer **rescans the root** — its frozen entries are dropped and the
- directory is read again. (The plan said "a reconciliation, not a full
- rescan"; it is a rescan, deliberately. It is the same path a root coming
- back from `refresh_availability` already took, and a device people carry
- around can come back arbitrarily different — the hash cache means unchanged
- files are not re-read, which is where the cost would have been.)
-6. `index_sync` update propagates — entries reappear in all apps
-
-**The flag is persisted, and restored at startup.** `ejected` lives in
-`roster.db` (`root_ejected:<folded name>`), not in `node.toml`: it is runtime
-state, and an operator's hand-written config must not be rewritten because a USB
-drive was unplugged. It has to survive a restart — a restart is exactly what an
-operator does after noticing a drive fell off, and a flag that only lived in
-memory would let the scan that follows read the empty mount point as an erased
-library. `daemon._build_roots()` merges the two sources; it is the only place
-that builds a `RootSet` for a group.
-
-**Auto-detection safety net.** If a `removable` root's path suddenly disappears
-(operator unplugged without clicking eject):
-
-- `refresh_availability()` detects `is_live() = false`
-- Because `removable = true`, it sets `ejected = true` automatically (as if the
- operator had clicked eject), and reports it through the indexer's
- `on_root_ejected` callback so the daemon writes it to `roster.db` — an
- auto-eject that only existed in memory would be undone by the next restart
-- Entries freeze, no deletions propagate
-- The root stays in "ejected" state until the operator explicitly plugs it back
-
-For non-removable roots, the existing behavior is unchanged: `available` flips
-based on `is_live()`, entries freeze when unavailable, rescan when available again.
-
-**Eject button in Files app.** In addition to the Settings table, an eject button
-appears in the Files app root-level view, next to each removable root's name. This
-provides quick access without navigating to Settings. Same confirmation dialog,
-same API call. Ejected roots show as greyed-out with a plug icon to re-enable.
-
-**What is NOT deleted on eject:**
-
-- Index entries (frozen, not removed)
-- TMDB / MusicBrainz cached metadata
-- Video thumbnails in `media_cache`
-- Chat message history referencing files on that root
-- App directory configurations pointing to that root (but flagged as temporarily
- invalid — the app shows a warning, not an error)
-
-**MNP message:** `ROOT_EJECT` / `ROOT_EJECT_ACK` and `ROOT_PLUG` / `ROOT_PLUG_ACK`
-— signed operator ops, same pattern as `ROOT_UPDATE`. Broadcast to all connected
-peers so they see the availability change immediately without waiting for the next
-`index_sync`.
-
-### 1.6 Server-side normalization (ops.py)
-
-Two generic functions replace the per-app specific ones:
-
-```python
-def set_app_directory(state, group_id, app_key, path, *, require_writable=False):
- """Set a single directory for an app. Validates path is within a named root.
- If require_writable, refuses paths under RO roots."""
-
-def set_app_directories(state, group_id, app_key, paths, *, require_writable=False):
- """Set multiple directories for an app. Same validation."""
-```
-
-Existing functions (`set_video_root`, `set_audio_root`, `set_photo_roots`) become
-thin wrappers calling the generic versions, preserving the current MNP message types
-and roster keys for backward compat. New apps use the generic functions directly.
-
-### 1.7 Chat settings additions
-
-- **Directory picker** (single, RW-only): selects the directory for chat file
- attachments. If no RW root exists, the picker shows an explanation and the
- attachment button is disabled in the chat UI. If the selected directory's root is
- later set to RO, the setting is flagged as invalid and attachments are disabled
- until corrected.
-- **Link preview toggle** (new, server-side): the operator can disable link previews
- for the group. Stored in `roster.db` as `chat_link_preview` (default: enabled).
- The node's `linkpreview.py` checks this setting before unfurling. The toggle is a
- `ToggleSwitch` in the Chat settings section.
-
-### 1.8 Videos/Music/Photos settings changes
-
-**Videos:**
-- Directory picker changes from single to **multi-directory** (via folder tree widget)
-- TMDB settings section moved here from the monolithic settings
-- TMDB API key field: no longer says "optional" or mentions the default key.
- Instead, a prompt to sign up on TMDB with a direct link to generate a key
-- Per-app Save button triggers TMDB cache sweep
-
-**Music:**
-- Directory picker changes from single to **multi-directory**
-- MusicBrainz settings section moved here
-- Per-app Save button triggers MusicBrainz cache sweep
-
-**Photos:**
-- Multi-directory picker (already multi, just moves to the folder tree widget)
-- No third-party service settings
-
-### 1.9 Handshake ack changes
-
-The `handshake_ack` payload gains per-root metadata:
-
-```python
-# Current
-"roots": [{"name": "Movies", "path": "/mnt/movies", ...}]
-"member_upload": True
-
-# New
-"roots": [{"name": "Movies", "path": "/mnt/movies", "writable": False, "removable": True, ...}]
-# member_upload removed (deprecated, still parsed by old clients)
-```
-
-For backward compatibility with MNP 1.0 peers:
-- A 1.0 client that does not see `writable` on roots falls back to the old model
- (root with `upload=True` is writable, `member_upload` from the ack controls access)
-- A 1.1 node continues to send `member_upload` as a computed value: `True` if any
- root is writable, `False` otherwise — so old clients behave sensibly
-- `member_upload` is no longer writable via MNP ops; the node computes it from roots
-
-### 1.10 CLI changes
-
-As built. The group is a `--group` option rather than a positional, matching
-every other verb in this CLI, and the negative flags are spelled `--no-writable`
-/ `--no-removable` rather than `--read-only`, so each pair reads as one setting.
-
-```
-# Group creation (first root defaults to RW)
-meshbay-node group add <name> --dir <path> # first root, RW
-meshbay-node group add <name> --dir <path> --no-writable # first root, RO
-
-# Root management (--group is optional with one group configured)
-meshbay-node root list [--group <name>]
-meshbay-node root add <path> [--name <name>] [--writable] [--removable]
-meshbay-node root remove <name> [--yes]
-meshbay-node root set <name> --writable | --no-writable
-meshbay-node root set <name> --removable | --no-removable
-meshbay-node root eject <name> # safe eject
-meshbay-node root plug <name> # re-plug
-
-# Deprecated (accepted with a warning)
---upload-dir → "use --writable on the target root instead"
-member upload → removed; use 'root set --no-writable' / '--writable'
-```
-
-### 1.11 HelloWorld proof-of-concept
-
-A minimal app that validates the plugin architecture end to end:
-
-- `static/helloworld-app.js`: renders a greeting and lists files in its configured
- directory
-- `static/helloworld-app-settings.js`: single-directory picker (via folder tree
- widget), no other settings
-- Entry in `apps.js` with `key: "helloworld"`, icon, label, Component, Settings
-- `ALLOWED_APPS` extended on the node
-- No dedicated `helloworld.py` — uses the generic `set_app_directory()` function,
- which is the whole point
-
-The HelloWorld app is **not shipped in production**. It lives in the tree as a
-reference implementation and can be excluded from the build. Its value is proving
-that the plugin mechanism works: zero changes to `group-settings.js`,
-`group-page.js`, `webrtc_server.py` or `ops.py` to add it.
-
-### 1.12 Migration (existing nodes)
-
-A script in `QE/migration/` (not versioned) handles Fedora and Ubuntu nodes:
-
-**node.toml:**
-- `upload = true` → `writable = true`
-- `upload = false` (or absent) → `writable = false`
-- Add `removable = false` to all roots that lack it
-- Remove `upload_dir` from `[[groups]]` blocks (if present)
-
-**roster.db:**
-- If `member_upload = "off"` for a group: set all that group's roots to
- `writable = false` (the intent was "no uploads")
-- Rename `video_root` → `video_directories` (wrap single value in a list)
-- Rename `audio_root` → `audio_directories` (same)
-- `photo_roots` → `photo_directories` (rename only)
-- Remove `member_upload` rows
-- Add `chat_link_preview = "true"` default for groups with chat enabled
-- Add `chat_directory` for groups that had an upload root (default: the upload
- root's path)
-
-**Protocol version:**
-- MNP version file bumped to 1.1
-
-**The script is idempotent** — running it twice is safe.
-
----
-
-## 2. Phase 1 — Root RO/RW model + Shared Directories UI
-
-**Goal:** Change the data model from `upload` to `writable`/`removable`, build the
-shared directories table, restructure the top of Settings and the Create Group
-wizard. Remove the Uploads section. Files always enabled.
-
-**Testable after this phase:** Create a group with RO/RW roots, toggle RW in
-Settings, add/remove roots in the new table, see the Upload button appear/disappear
-in Files based on the current root's writable flag, eject a removable root and verify
-files disappear from all apps without data loss, plug it back and verify files
-reappear, CLI works with new syntax including `root eject/plug`.
-
-### 2.1 Backend changes
-
-| File | Change |
-|---|---|
-| `config.py` | `RootSpec`: add `writable: bool = False`, `removable: bool = False`. Remove `upload` field. `__post_init__` migration: `upload=True` → `writable=True`. Parse new fields from node.toml |
-| `roots.py` | `Root` dataclass: add `writable`, `removable`, `ejected`. Remove `upload`. `available` becomes a computed property: `not self.ejected and self.is_live()`. `_settle_upload_root()` removed. `RootSet.build()`: validate at least one root exists (no RW minimum). `refresh_availability()`: when a `removable` root's path disappears, auto-set `ejected=True` (safety net). Collision checks unchanged |
-| `ops.py` | `add_root()`: accept `writable`, `removable` params. `remove_root()`: refuse removing last root (unchanged). `attach_group()`: first root defaults to `writable=True`. Remove `set_member_upload()`. New: `update_root()` for toggling writable/removable on an existing root (signed op `OP_ROOT_UPDATE`). New: `eject_root()` — sets `ejected=True`, stops watchdog for that root. New: `plug_root()` — checks `is_live()`, sets `ejected=False`, triggers reconciliation |
-| `roster.py` | No schema change (generic key/value). Remove `member_upload` handling from `_apply_group_settings()` |
-| `ui/app.py` | `POST /api/groups/{gid}/roots`: accept `writable`, `removable`. New: `PATCH /api/groups/{gid}/roots/{name}` → `ops.update_root()`. New: `PUT /api/groups/{gid}/roots/{name}/eject` → `ops.eject_root()`. New: `PUT /api/groups/{gid}/roots/{name}/plug` → `ops.plug_root()`. Remove `PUT /api/groups/{gid}/member-upload` |
-| `daemon.py` (CLI) | New `root` subcommand: `add`, `remove`, `set`, `list`. `group add --dir` defaults to `writable=True`. Deprecate `--upload-dir` with warning. Remove `member upload` command |
-| `webrtc_server.py` | Handshake ack: add `writable`/`removable`/`ejected` per root. Compute `member_upload` for backward compat. `_do_file_upload`: check `root.writable` instead of `root.upload` + `member_upload_allowed`. Handle `ROOT_UPDATE`, `ROOT_EJECT`, `ROOT_PLUG` MNP messages. Broadcast root availability changes to all connected peers. `ALLOWED_APPS`: add `"files"` to always-enabled set |
-| `protocol.py` | New message types: `ROOT_UPDATE` / `ROOT_UPDATE_ACK`, `ROOT_EJECT` / `ROOT_EJECT_ACK`, `ROOT_PLUG` / `ROOT_PLUG_ACK`. `ROOT_ADD` gains `writable`, `removable` fields |
-| `indexer.py` | `eject_root()`: stop the watchdog observer for that root, do NOT touch entries. `plug_root()`: restart observer, trigger reconciliation pass. `refresh_availability()`: auto-eject removable roots whose path disappears (set `ejected=True` instead of just flipping `available`) |
-| `handshake.py` | MNP version → 1.1 (minor, additive) |
-
-### 2.2 Frontend changes
-
-| File | Change |
-|---|---|
-| `group-settings.js` | New `SharedDirectoriesTable` component (reusable). Includes eject/plug button per removable root. Move to top of settings (after Invite/Pair). Remove the Uploads toggle section. Remove the old Directories section (root management part — app root pickers stay for now). Calls loopback API for add/remove/update/eject/plug root |
-| `create-group-page.js` | Replace app checkboxes with nothing (Files auto-enabled). Replace directory section with `SharedDirectoriesTable` (same component). First root defaults `writable=true`. Step 2: remove `set enabled_apps` call (Files is automatic) |
-| `files-app.js` | Upload button visibility: check `currentRoot.writable && currentRoot.available`. Upload target: the root currently being browsed. Hide upload affordances on RO roots. Eject/plug button next to each removable root name in root-level view. Ejected roots greyed out with plug icon. Entries from unavailable roots filtered out of all views |
-| `chat-app.js` | Attachment button: disabled if no RW root exists or if the chat directory's root is RO or unavailable. Tooltip explaining why |
-| `group-page.js` | `nodeRoots` state: include `writable`/`removable`/`ejected` from handshake ack. Handle `ROOT_EJECT_ACK`/`ROOT_PLUG_ACK` broadcasts to update root state live. Remove `memberUpload` state. Remove `onUploadPolicy` callback |
-| `video-app.js` | Filter entries: exclude files from unavailable roots |
-| `music-app.js` | Filter entries: exclude files from unavailable roots |
-| `photos-app.js` | Filter entries: exclude files from unavailable roots |
-| `apps.js` | Add `alwaysEnabled: true` to `files` entry |
-| `transport.js` | Parse new root fields from handshake ack |
-
-### 2.3 Localization
-
-New keys in `locales/*.js`:
-- `sharedDirectories`, `sharedDirectoriesHint` ("At least one directory is
- required...")
-- `readOnly`, `readWrite`, `removableDevice`
-- `uploadNotAvailableRO` (tooltip: "This directory is read-only")
-- `ejectRoot`, `ejectRootConfirm` ("Eject *{name}*? Files from this directory
- will be temporarily hidden...")
-- `plugRoot`, `plugRootFailed` ("Directory not found. Is the device connected?")
-- `rootEjected` (status label shown on ejected roots)
-- Deprecation: `uploadToggle*` keys can be removed
-
----
-
-## 3. Phase 2 — App Settings Plugin Architecture + Folder Tree Widget
-
-**Goal:** Split app settings into per-app files, build the folder tree widget,
-restructure Settings with per-app collapsible sections. Normalize server-side
-ops.
-
-**Testable after this phase:** Each app has its own settings section with toggle.
-Folder tree popup works for directory selection. TMDB/MusicBrainz settings are in
-their app sections. Chat has link preview toggle. Videos/Music use multi-directory.
-
-### 3.1 Folder tree widget
-
-| File | Change |
-|---|---|
-| `static/folder-tree.js` (new) | `FolderTreePicker` component. Props: `roots` (with writable/removable), `dirs` (flat list from index), `mode` ("single"/"multi"), `requireWritable` (bool), `selected` (current selection), `onSelect` callback. Renders a modal with tree-view of directories. Builds tree structure from flat `nodeDirs` paths |
-
-**Behavior:**
-- Modal overlay with semi-transparent backdrop, centered panel
-- Root level: each root with folder icon, name, RO/RW badge, removable badge
-- `[+]` / `[-]` toggle to expand/collapse children
-- Directories sorted alphabetically at each level
-- Single mode: clicking a directory selects it (highlight), deselects previous
-- Multi mode: clicking a directory toggles its selection (checkbox visual)
-- `requireWritable=true`: RO roots and all their children are greyed out and
- unclickable, with a brief explanation at the top of the modal
-- Selected path shown at the bottom of the modal
-- OK (disabled if nothing valid selected) and Cancel buttons
-- Escape key closes
-
-### 3.2 Per-app settings files
-
-| File | Content |
-|---|---|
-| `static/chat-app-settings.js` (new) | `ChatSettings` component. Single-directory picker (folder tree, `requireWritable=true`). Link preview toggle (`ToggleSwitch`). Save button. Validates: selected directory must be on a RW root |
-| `static/video-app-settings.js` (new) | `VideoSettings` component. Multi-directory picker (folder tree). TMDB section: toggle + API key + language (moved from `group-settings.js`). TMDB key prompt: "Sign up on TMDB to generate your API key" with link, no "optional" wording. Save triggers TMDB sweep |
-| `static/music-app-settings.js` (new) | `MusicSettings` component. Multi-directory picker. MusicBrainz section: toggle (moved from `group-settings.js`). Save triggers MusicBrainz sweep |
-| `static/photos-app-settings.js` (new) | `PhotoSettings` component. Multi-directory picker. No third-party settings. Save button |
-| `static/apps.js` | Each `APPS` entry gains `Settings` field imported from the corresponding settings file. `files` has no `Settings` (no per-app config). `files` has `alwaysEnabled: true` (from Phase 1) |
-
-### 3.3 Settings page restructure
-
-| File | Change |
-|---|---|
-| `group-settings.js` | Remove all inlined app settings (TMDB section, MusicBrainz section, app root pickers). Remove the Applications checkbox section. New rendering loop: for each app in `APPS` where `!app.alwaysEnabled && app.Settings`, render a `CollapsibleSection` with: icon + title in header, toggle switch in header, `app.Settings` component inside (visible only when enabled). Section collapsed by default. App toggle triggers signed `OP_APPS_ENABLED` op |
-
-**Final settings layout:**
-
-```
-1. Invite form (if admin & invite-only)
-2. Pair operator (if nodeAdmin & not paired)
-── App configuration ──
-3. Shared directories (expanded, SharedDirectoriesTable)
-4. 💬 Chat [toggle] (collapsed)
- └─ Directory picker, Link preview toggle, Save
-5. 🎬 Videos [toggle] (collapsed)
- └─ Directory picker (multi), TMDB settings, Save
-6. 🎵 Music [toggle] (collapsed)
- └─ Directory picker (multi), MusicBrainz settings, Save
-7. 📷 Photos [toggle] (collapsed)
- └─ Directory picker (multi), Save
-8. [Future apps discovered from APPS registry]
-── Node tuning ──
-9. Scan tuning (reconcile, debounce)
-── Danger zone ──
-10. Leave / Delete group
-── Identity ──
-11. My devices
-12. Members table
-```
-
-### 3.4 Server-side normalization
-
-| File | Change |
-|---|---|
-| `ops.py` | New generic: `set_app_directory(state, group_id, app_key, path, require_writable=False)` and `set_app_directories(state, group_id, app_key, paths, require_writable=False)`. Both validate path(s) within named roots and check writable if required. Existing `set_video_root` → wrapper calling `set_app_directories("video", ...)`. Same for audio, photo. New: `set_chat_directory(state, group_id, path)` → `set_app_directory("chat", path, require_writable=True)`. New: `set_chat_link_preview(state, group_id, enabled)` |
-| `webrtc_server.py` | Handle new MNP messages: `CHAT_DIRECTORY` / `ACK`, `CHAT_LINK_PREVIEW` / `ACK`. Refactor `VIDEO_ROOT` handler to use generic. Handshake ack: add `chat_directory`, `chat_link_preview` |
-| `protocol.py` | New message types: `CHAT_DIRECTORY`, `CHAT_LINK_PREVIEW` (and acks) |
-| `ui/app.py` | New endpoints: `PUT /api/groups/{gid}/chat-directory`, `PUT /api/groups/{gid}/chat-link-preview`. Generic: `PUT /api/groups/{gid}/app-directories/{app_key}` |
-| `linkpreview.py` | Check `chat_link_preview` setting before unfurling |
-
-### 3.5 Handshake ack additions
-
-```python
-"chat_directory": "/Shared/uploads",
-"chat_link_preview": True,
-"video_directories": ["/Movies", "/Series"], # replaces video_root (single)
-"audio_directories": ["/Music"], # replaces audio_root (single)
-"photo_directories": ["/Photos", "/Camera"], # replaces photo_roots
-```
-
-Old field names (`video_root`, `audio_root`, `photo_roots`) still sent for backward
-compat with MNP 1.0 clients. New clients read the `*_directories` form.
-
----
-
-## 4. Phase 3 — HelloWorld, CLI polish & Migration
-
-**Goal:** Prove the plugin architecture with a HelloWorld app, finalize CLI changes,
-write and test the migration script.
-
-### 4.1 HelloWorld app
-
-| File | Content |
-|---|---|
-| `static/helloworld-app.js` (new) | Minimal component: renders "Hello, World!" heading + lists files from its configured directory. Uses `entries` from `commonProps`, filtered by the configured path |
-| `static/helloworld-app-settings.js` (new) | `HelloWorldSettings` component: single-directory picker via `FolderTreePicker`, Save button. Uses `set_app_directory("helloworld", path)` on the generic endpoint |
-| `apps.js` | New entry: `{ key: "helloworld", icon: "👋", labelKey: "helloWorld", Component: HelloWorldApp, Settings: HelloWorldSettings }` |
-| `webrtc_server.py` | Add `"helloworld"` to `ALLOWED_APPS` |
-
-**Validation:** enabling HelloWorld in Settings, picking a directory, saving, and
-seeing the file list in the HelloWorld tab — with **zero changes** to
-`group-settings.js`, `group-page.js`, or `ops.py`. If this works, any future app
-can be added the same way.
-
-### 4.2 CLI final polish
-
-- `root` subcommand fully tested: `add`, `remove`, `set`, `list`
-- `group add --upload-dir` prints deprecation warning and maps to `--dir <path>
- --writable`
-- `member upload` command removed (prints migration guidance)
-- Help text updated to reflect RO/RW model
-- `test_cli_dispatch.py` updated for all new verbs
-
-### 4.3 Migration script
-
-`QE/migration/migrate_groups_v2.sh` (or `.py`) — not versioned, for Fedora/Ubuntu
-nodes only.
-
-**node.toml transformations:**
-```
-upload = true → writable = true
-upload = false → writable = false
-(no upload field) → writable = false
-(add removable = false to every root that lacks it)
-(remove upload_dir lines from [[groups]] blocks)
-```
-
-**roster.db transformations:**
-```sql
--- Convert member_upload=off to all-RO roots (handled via ops on restart)
--- Rename app directory keys
-UPDATE group_settings SET key = 'video_directories' WHERE key = 'video_root';
-UPDATE group_settings SET key = 'audio_directories' WHERE key = 'audio_root';
-UPDATE group_settings SET key = 'photo_directories' WHERE key = 'photo_roots';
--- Wrap single values in JSON arrays for video/audio
--- Add chat defaults
-INSERT INTO group_settings (group_id, key, value)
- SELECT group_id, 'chat_link_preview', 'true'
- FROM group_settings WHERE key = 'enabled_apps' AND value LIKE '%chat%';
--- Remove member_upload rows
-DELETE FROM group_settings WHERE key = 'member_upload';
-```
-
-**Idempotency:** every transformation is guarded (`IF NOT EXISTS`, check before
-rename, etc.). Safe to run twice.
-
-**Rollback:** the script backs up `node.toml` and `roster.db` before any change.
-
-### 4.4 Windows notes
-
-No migration script needed for Windows (manual setup). Functional non-regression
-testing only:
-- Drive letter roots (`D:\Movies`, `E:\Music`) work with RO/RW
-- Removable flag on USB drives
-- Folder tree widget handles backslash paths
-- Create Group wizard with Windows paths
-
----
-
-## 5. Risk assessment
-
-| Risk | Mitigation |
-|---|---|
-| Upload regression | Phase 1 is self-contained: test uploads on RW roots, verify refused on RO roots, before touching app settings |
-| Eject data loss | Eject freezes entries (existing `freeze-not-empty` path). Ejected roots are never rescanned. Auto-eject safety net for surprise unplugs on removable roots. Explicit reconciliation (not full rescan) on plug |
-| Indexer race on eject | Watchdog observer is stopped synchronously before `ejected=true` is set. No window where the watchdog sees a missing path and processes deletions |
-| MNP backward compat | Computed `member_upload` in ack for 1.0 clients. New fields additive. Old field names kept alongside new ones |
-| Monolithic `group-settings.js` diff | Phase 2 extracts code into new files; the old code is deleted, not refactored. Clear before/after |
-| Folder tree perf with large indexes | `nodeDirs` is already computed. Tree construction is O(n) on directory count, not file count. Lazy child rendering on expand |
-| Windows path handling | Existing NFC normalization and path handling unchanged. New fields (`writable`, `removable`) are path-independent booleans. Drive letters work as root paths |
-| Migration data loss | Script backs up before changes. Idempotent. Tested on a staging node before production |
-
----
-
-## 6. Files touched (by phase)
-
-### Phase 1
-```
-packages/meshbay-node/src/meshbay_node/config.py
-packages/meshbay-node/src/meshbay_node/roots.py
-packages/meshbay-node/src/meshbay_node/ops.py
-packages/meshbay-node/src/meshbay_node/roster.py
-packages/meshbay-node/src/meshbay_node/ui/app.py
-packages/meshbay-node/src/meshbay_node/daemon.py
-packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
-packages/meshbay-common/src/meshbay_common/protocol.py
-packages/meshbay-common/src/meshbay_common/handshake.py
-packages/meshbay-hub/src/meshbay_hub/static/group-settings.js
-packages/meshbay-hub/src/meshbay_hub/static/create-group-page.js
-packages/meshbay-hub/src/meshbay_hub/static/group-page.js
-packages/meshbay-hub/src/meshbay_hub/static/files-app.js
-packages/meshbay-hub/src/meshbay_hub/static/chat-app.js
-packages/meshbay-hub/src/meshbay_hub/static/apps.js
-packages/meshbay-hub/src/meshbay_hub/static/transport.js
-packages/meshbay-node/src/meshbay_node/indexer/indexer.py
-packages/meshbay-hub/src/meshbay_hub/static/video-app.js
-packages/meshbay-hub/src/meshbay_hub/static/music-app.js
-packages/meshbay-hub/src/meshbay_hub/static/photos-app.js
-packages/meshbay-hub/src/meshbay_hub/static/locales/*.js
-```
-
-### Phase 2
-```
-packages/meshbay-hub/src/meshbay_hub/static/folder-tree.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/chat-app-settings.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/video-app-settings.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/music-app-settings.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/photos-app-settings.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/group-settings.js (extract)
-packages/meshbay-hub/src/meshbay_hub/static/apps.js
-packages/meshbay-node/src/meshbay_node/ops.py
-packages/meshbay-node/src/meshbay_node/ui/app.py
-packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
-packages/meshbay-node/src/meshbay_node/linkpreview.py
-packages/meshbay-common/src/meshbay_common/protocol.py
-packages/meshbay-hub/src/meshbay_hub/static/locales/*.js
-```
-
-### Phase 3
-```
-packages/meshbay-hub/src/meshbay_hub/static/helloworld-app.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/helloworld-app-settings.js (new)
-packages/meshbay-hub/src/meshbay_hub/static/apps.js
-packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
-packages/meshbay-node/src/meshbay_node/daemon.py
-tests/test_cli_dispatch.py
-QE/migration/migrate_groups_v2.py (new, not versioned)
-```
-
----
-
-## 7. Estimated effort
-
-| Phase | Scope | Approx. size |
-|---|---|---|
-| Phase 1 | Data model + shared dirs UI + eject/plug + CLI + remove uploads | ~1800 lines changed/added |
-| Phase 2 | Folder tree + 4 app-settings files + settings restructure + server normalization | ~1800 lines changed/added |
-| Phase 3 | HelloWorld + CLI polish + migration script | ~500 lines |
-
-Each phase is one focused Claude session. Test between phases.
-
----
-
-## 7b. Phase 1 review (2026-09-06)
-
-What the plan above got wrong, and what was actually built. The first three
-entries are **rules for phases 2 and 3**, not one-off fixes: each describes a
-shape the same code can take again.
-
-### The rules
-
-**An operator is not sitting at their node.** The shared directories table read
-its roots exclusively from the loopback API (`platform.node.available`), which
-resolves to "not available" in a browser. So the section rendered for nobody on
-the web — while the Uploads controls it replaced *had* worked there — and the
-`transport.updateRoot` / `ejectRoot` / `plugRoot` methods written next to it
-were unreachable. §2.2 of the plan said "calls loopback API", and that was the
-mistake: MNP is the path that must exist, and loopback is the fallback for a
-local node with no live connection. Every operator-facing control phase 2 adds
-(the folder tree, four app settings panes, the link-preview toggle) needs the
-MNP route first. Pinned by `test_upload_controls_hidden.py`.
-
-**A reply that carries state nobody could have predicted has to be handed on.**
-`transport.js` resolves an admin `*_ack` against the pending request and
-returns, deliberately: every caller already updates local state from the value
-it chose. The root acks are not like that — they carry the node's whole roots
-table, including things only it knows (availability, the name it settled on,
-the eject a failed plug left in place). Returning left the operator who clicked
-Eject as the single client that never saw it happen, while every *other* peer
-got the broadcast. Any phase-2 op returning computed state has the same shape.
-
-**A control that writes needs to name where.** The node was given a `root`
-field on `file_upload` and no client ever sent it, so every upload went to
-`writable_roots[0]` while the Files toolbar offered the button based on the root
-being browsed. With two writable roots, uploading from one wrote into the other.
-This is the failure `_settle_upload_root`'s deleted docstring existed to
-prevent, reintroduced by removing it. Chat's attachments have the same problem
-one level up and get an explicit `attachRoot` until §1.7 gives them a
-configured directory.
-
-### The rest
-
-- **`ejected` was written to `roster.db` and never read back**, and the
- auto-eject path did not persist at all. Both fixed; see §1.5b.
-- **`PUT /api/groups/{gid}/member-upload` became a stub returning `200
- {"deprecated": true}`.** A route that answers OK and changes nothing is
- indistinguishable from a working one to whoever calls it. Removed.
-- **The wizard ignored the first root's RW switch** — `ops.attach_group` always
- wrote `writable = true`. It takes the flag now.
-- **`refresh_availability` was the only reader of a root's config.** The reload
- path compared roots on `(name, path)`, so an operator editing `writable` in
- `node.toml` and reloading saw nothing happen. The comparison includes the
- flags.
-- **The table had no Path column** (§1.5 asked for one). Two libraries whose
- folders share a basename are indistinguishable without it, and the basename is
- the identity — so it is the one thing that has to be visible.
-- **Phase 1 shipped no tests.** 29 of the suite's failures were its own. The
- gap that mattered was not the broken helpers but that eject, plug, per-root
- upload refusal and the `node.toml` rewrite had no coverage at all:
- `test_root_eject.py`, `test_root_writable_policy.py` and the new cases in
- `test_ops.py` / `test_node_status.py` / `test_security_regressions.py` are
- that. `test_member_upload_policy.py` is gone — it tested a removed feature.
-- **`chat-app.js` was in §2.2's file list and was never touched.**
-- **Eight of the ten locales were missing the new keys.** `test_locales.py`
- holds them to `en.js`, so this was a failing test rather than a silent gap —
- but it is worth noting that adding a key means adding it ten times.
-
-### Still open, deliberately
-
-- **The operator can no longer have a directory only they may write to.** RW is
- open to every member; RO refuses everyone including the operator. This
- reverses draft-v6's structural decision 9, which is annotated there. It is a
- real capability removed, and if it turns out to be wanted the answer is a
- third state on the root, not the old group-wide switch.
-- `test_ops.py::test_a_backslash_path_written_into_node_toml_stays_parseable`
- fails on any non-Windows machine and always has — it builds a
- `PurePosixPath` from a Windows path. Unrelated to this refactor, left alone.
-
----
-
-## 7c. Phase 2 as built (2026-09-06)
-
-The plan held. Four things were done differently, and one of them is a rule.
-
-### The rule
-
-**A settings key added to the client must be added ten times.** `test_locales`
-holds the nine other catalogues to `en.js`, so a missing key is a failing test
-rather than a silent gap — but Phase 2 added 27 keys, and doing them one file
-at a time is how the Phase 1 gap happened. Write the table, generate the
-insert.
-
-**And a second one, which cost a bug in this phase:** `node --check foo.js`
-does **not** reliably report a module syntax error. It accepted a file with
-`${/* ... */''}` — htm template syntax, pasted into a plain object literal —
-and reported success. Copying to `.mjs` first forces the module parser, which
-reports it. `test_spa_syntax.py` now does that for every module; the suite had
-no syntax check at all before, which is how the file was committed.
-
-### Done differently
-
-- **Almost no migration script.** The plan (§4.3) called for one to rename
- `video_root` → `video_directories` in `roster.db`. Instead the roster falls
- back to the old key when the new one is unset, and the first save through the
- new path leaves it behind. A script that has to be run by hand on the machine
- where it matters is a step that does not happen; a fallback is one that
- cannot be skipped. `node.toml` needs nothing either — `upload = true` is read
- as `writable`.
-
- **One transformation genuinely cannot be a fallback**, and an earlier draft
- of this section wrongly said the script was unnecessary altogether. A group
- whose operator had turned `member_upload` *off* has that switch ignored after
- the upgrade, because nothing consults it any more — and its root still says
- `upload = true`, so it accepts uploads from every member again. Nobody is
- told. "Uploads are off for this group" and "this root is writable" are two
- different sentences that happened to disagree, and only the operator knows
- which they meant; there is nothing to infer. `QE/migration/check_upload_policy.py`
- reads both files, reports the groups affected, and prints the `root set
- --no-writable` line for each. Read-only, exits non-zero when something needs
- a decision, so it can gate a deploy.
-- **`music`, not `audio`.** The app's registry key was `music` while its
- storage said `audio_root` and its ops said `set_audio_root`. One identifier
- per app now — the registry key — with the correspondence in exactly one
- table (`Roster.LEGACY_DIR_KEYS`).
-- **One storage shape.** `set_app_directory` (single) writes a one-element
- list, so there is no scalar form anywhere below the wire. `video_root` and
- friends survive on the handshake ack only, *derived* from the list rather
- than stored beside it — a second stored value drifts within one run, which
- reads as "it works after a restart".
-- **The panes call the transport themselves.** The plan had every pane report
- through one `onSave`, which would have made the page a dispatcher naming
- every app's settings keys — the thing the phase exists to remove. The line
- is: what every app has (directories) the page does, generically; what one
- app alone has (a TMDB key, a link-preview switch) the pane does with the
- transport it is handed. An app that only wants directories touches neither
- file, which is `test_app_settings_plugin.py`'s subject.
-
-### Worth knowing
-
-- `settings-ui.js` exists because `group-settings` → `apps` → a pane →
- `group-settings` is an import cycle, and ES modules answer that with a
- temporal-dead-zone `ReferenceError` at first render — the component simply
- does not appear, which is the fault already recorded in CLAUDE.md about hook
- ordering. The shared widgets live outside both.
-- The folder picker asks the node for **nothing**. The tree is derived from
- paths the client already holds, so it shows what the group's index contains
- and no more — a folder the node never indexed does not exist as far as the
- group is concerned. There is no folder-browsing protocol and this does not
- add one.
-- `_ASSETS` in `webapp.py` had to grow by six. Modules reached through the
- registry rather than imported by name are exactly the ones nothing else would
- notice changing, and a stale one is served from a browser cache with no
- version bump. `test_asset_versioning` caught it.
-- **What Phase 3 still owes:** the HelloWorld app (§4.1) — which is the actual
- proof of the above, since every test here reads source rather than adding an
- app and watching it work — plus the CLI polish and the Windows pass.
-
----
-
-## 7d. Phase 3 as built (2026-09-07)
-
-### HelloWorld earned its place
-
-It was written last and immediately found two things no amount of source
-reading had: `group-settings.js` fell back to the *whole* registry when a group
-had no `enabled_apps` yet — which would have enabled a hidden app for everyone
-— and `group-page.js` wrote out `videoDirectories` / `musicDirectories` /
-`photoDirectories` by hand, so a fifth app would have needed that file edited.
-Both are fixed by making the code less app-specific, and the plugin claim is
-now true rather than nearly true.
-
-That is the argument for keeping it: every other test of the architecture reads
-source for the *absence* of app names, which proves nobody wrote a special case
-— not that a new app works. Deleting HelloWorld would leave the claim resting
-entirely on tests that read text.
-
-**It is hidden behind `?dev=1`**, not excluded from the build as §4.1 imagined.
-There is no build step to exclude it from, and an unregistered app proves
-nothing, since registration is exactly what is claimed to be sufficient. The
-flag is the same opt-in shape as `transport.js`'s `?trace=1`.
-
-### The CLI
-
-**`--upload-dir` is gone, not deprecated.** It was documented as the old
-spelling first, which was wrong and was caught in review. It wrote `upload_dir`
-into a *brand-new* `[[groups]]` block, and `GroupConfig.__post_init__` reads
-that key by forcing every other root read-only and appending that path as the
-one writable one — so `group add --dir X --writable --upload-dir Y` silently
-made X read-only. Two mechanisms deciding which directories accept uploads, one
-of them invisible, in a group created after the model that replaced it. The
-*read* path stays, because an existing node.toml must keep working; that is the
-only legitimate use, and nothing writes the key any more.
-
-`member upload` reached the generic usage line for the other `member` verbs —
-"usage: meshbay-node member upload <username>" — which advertises a removed
-feature and sends the operator looking for a username it would then reject. It
-names `root set --writable` now. `--upload-dir` still works, so an existing
-script keeps working, but its help and the man page say it is the old spelling.
-
-### Windows
-
-`test_windows_root_shapes.py` covers what can be covered from here: drive
-letters and UNC through `as_posix()` into TOML, a drive root having no basename
-to derive a name from, and a case-insensitive collision — which on NTFS and
-exFAT is one directory indexed as two roots. All pass.
-
-**What still needs a person on Windows**, and cannot be faked:
-
-- `ReadDirectoryChangesW` dropping events under load — the reason periodic
- reconciliation is mandatory, and the reason eject exists at all
-- `MAX_PATH` against a deep library, on download and on upload
-- whether an eject actually lets the drive be removed, and a plug picks it back
- up — the eject/plug pair is the least-exercised thing in all three phases
-- the folder-tree picker against backslash paths in the UI
-- the Create Group wizard with a drive-letter root
-
-### What the whole refactor still owes
-
-Nothing in the plan. Two things it did not think of:
-
-- **`_do_dir_delete` was never checked against RO/RW.** `_do_file_upload` and
- `_do_dir_create` both gained the `writable` check; deletion is operator-only
- and so is not the same hole, but the asymmetry is worth a look.
-- **`index_delta` carries roots but not `dirs`.** A folder created by another
- member does not reach a connected client's folder picker until a full
- `index_sync`. Small, and the picker offers root names from the roots table
- regardless, so nothing is unreachable — but it is the same class as the bug
- §7d's roots fix closed.