mirror of
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fix(starlark): code review fixes - security, robustness, and schema parsing
## Security Fixes - manager.py: Check _update_manifest_safe return values to prevent silent failures - manager.py: Improve temp file cleanup in _save_manifest to prevent leaks - manager.py: Fix uninstall order (manifest → memory → disk) for consistency - api_v3.py: Add path traversal validation in uninstall endpoint - api_v3.py: Implement atomic writes for manifest files with temp + rename - pixlet_renderer.py: Relax config validation to only block dangerous shell metacharacters ## Frontend Robustness - plugins_manager.js: Add safeLocalStorage wrapper for restricted contexts (private browsing) - starlark_config.html: Scope querySelector to container to prevent modal conflicts ## Schema Parsing Improvements - pixlet_renderer.py: Indentation-aware get_schema() extraction (handles nested functions) - pixlet_renderer.py: Handle quoted defaults with commas (e.g., "New York, NY") - tronbyte_repository.py: Validate file_name is string before path traversal checks ## Dependencies - requirements.txt: Update Pillow (10.4.0), PyYAML (6.0.2), requests (2.32.0) ## Documentation - docs/STARLARK_APPS_GUIDE.md: Comprehensive guide explaining: - How Starlark apps work - That apps come from Tronbyte (not LEDMatrix) - Installation, configuration, troubleshooting - Links to upstream projects All changes improve security, reliability, and user experience. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
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docs/STARLARK_APPS_GUIDE.md
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# Starlark Apps Guide
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## Overview
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The Starlark Apps plugin for LEDMatrix enables you to run **Tidbyt/Tronbyte community apps** on your LED matrix display without modification. This integration allows you to access hundreds of pre-built widgets and apps from the vibrant Tidbyt community ecosystem.
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## Important: Third-Party Content
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**⚠️ Apps are NOT managed by the LEDMatrix project**
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- Starlark apps are developed and maintained by the **Tidbyt/Tronbyte community**
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- LEDMatrix provides the runtime environment but does **not** create, maintain, or support these apps
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- All apps originate from the [Tronbyte Apps Repository](https://github.com/tronbyt/apps)
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- App quality, functionality, and security are the responsibility of individual app authors
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- LEDMatrix is not affiliated with Tidbyt Inc. or the Tronbyte project
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## What is Starlark?
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[Starlark](https://github.com/bazelbuild/starlark) is a Python-like language originally developed by Google for the Bazel build system. Tidbyt adopted Starlark for building LED display apps because it's:
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- **Sandboxed**: Apps run in a safe, restricted environment
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- **Simple**: Python-like syntax that's easy to learn
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- **Deterministic**: Apps produce consistent output
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- **Fast**: Compiled and optimized for performance
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## How It Works
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### Architecture
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```
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┌─────────────────────────────────────────────────────────┐
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│ LEDMatrix System │
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│ ┌────────────────────────────────────────────────────┐ │
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│ │ Starlark Apps Plugin (manager.py) │ │
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│ │ • Manages app lifecycle (install/uninstall) │ │
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│ │ • Handles app configuration │ │
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│ │ • Schedules app rendering │ │
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│ └─────────────────┬──────────────────────────────────┘ │
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│ │ │
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│ ┌─────────────────▼──────────────────────────────────┐ │
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│ │ Pixlet Renderer (pixlet_renderer.py) │ │
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│ │ • Executes .star files using Pixlet CLI │ │
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│ │ • Extracts configuration schemas │ │
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│ │ • Outputs WebP animations │ │
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│ └─────────────────┬──────────────────────────────────┘ │
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│ │ │
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│ ┌─────────────────▼──────────────────────────────────┐ │
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│ │ Frame Extractor (frame_extractor.py) │ │
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│ │ • Decodes WebP animations into frames │ │
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│ │ • Scales/centers output for display size │ │
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│ │ • Manages frame timing │ │
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│ └─────────────────┬──────────────────────────────────┘ │
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│ │ │
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│ ┌─────────────────▼──────────────────────────────────┐ │
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│ │ LED Matrix Display │ │
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│ │ • Renders final output to physical display │ │
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│ └────────────────────────────────────────────────────┘ │
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└─────────────────────────────────────────────────────────┘
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▲
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│
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Downloads apps from
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│
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┌───────────────────┴─────────────────────────────────────┐
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│ Tronbyte Apps Repository (GitHub) │
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│ • 974+ community-built apps │
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│ • Weather, sports, stocks, games, clocks, etc. │
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│ • https://github.com/tronbyt/apps │
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└──────────────────────────────────────────────────────────┘
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```
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### Rendering Pipeline
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1. **User installs app** from the Tronbyte repository via web UI
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2. **Plugin downloads** the `.star` file (and any assets like images/fonts)
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3. **Schema extraction** parses configuration options from the `.star` source
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4. **User configures** the app through the web UI (timezone, location, API keys, etc.)
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5. **Pixlet renders** the app with user config → produces WebP animation
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6. **Frame extraction** decodes WebP → individual PIL Image frames
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7. **Display scaling** adapts 64x32 Tidbyt output to your matrix size
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8. **Rotation** cycles through your installed apps based on schedule
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## Getting Started
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### 1. Install Pixlet
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Pixlet is the rendering engine that executes Starlark apps. The plugin will attempt to use:
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1. **Bundled binary** (recommended): Downloaded to `bin/pixlet/pixlet-{platform}-{arch}`
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2. **System installation**: If `pixlet` is available in your PATH
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#### Auto-Install via Web UI
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Navigate to: **Plugins → Starlark Apps → Status → Install Pixlet**
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This runs the bundled installation script which downloads the appropriate binary for your platform.
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#### Manual Installation
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```bash
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cd /path/to/LEDMatrix
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bash scripts/download_pixlet.sh
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```
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Verify installation:
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```bash
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./bin/pixlet/pixlet-linux-amd64 version
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# Pixlet 0.50.2 (or later)
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```
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### 2. Enable the Starlark Apps Plugin
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1. Open the web UI
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2. Navigate to **Plugins**
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3. Find **Starlark Apps** in the installed plugins list
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4. Enable the plugin
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5. Configure settings:
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- **Magnify**: Auto-calculated based on your display size (or set manually)
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- **Render Interval**: How often apps re-render (default: 300s)
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- **Display Duration**: How long each app shows (default: 15s)
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- **Cache Output**: Enable to reduce re-rendering (recommended)
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### 3. Browse and Install Apps
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1. Navigate to **Plugins → Starlark Apps → App Store**
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2. Browse available apps (974+ options)
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3. Filter by category: Weather, Sports, Finance, Games, Clocks, etc.
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4. Click **Install** on desired apps
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5. Configure each app:
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- Set location/timezone
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- Enter API keys if required
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- Customize display preferences
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### 4. Configure Apps
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Each app may have different configuration options:
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#### Common Configuration Types
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- **Location** (lat/lng/timezone): For weather, clocks, transit
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- **API Keys**: For services like weather, stocks, sports scores
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- **Display Preferences**: Colors, units, layouts
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- **Dropdown Options**: Team selections, language, themes
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- **Toggles**: Enable/disable features
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Configuration is stored in `starlark-apps/{app-id}/config.json` and persists across app updates.
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## App Sources and Categories
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All apps are sourced from the [Tronbyte Apps Repository](https://github.com/tronbyt/apps). Popular categories include:
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### 🌤️ Weather
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- Analog Clock (with weather)
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- Current Weather
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- Weather Forecast
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- Air Quality Index
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### 🏈 Sports
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- NFL Scores
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- NBA Scores
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- MLB Scores
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- NHL Scores
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- Soccer/Football Scores
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- Formula 1 Results
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### 💰 Finance
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- Stock Tickers
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- Cryptocurrency Prices
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- Market Indices
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### 🎮 Games & Fun
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- Conway's Game of Life
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- Pong
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- Nyan Cat
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- Retro Animations
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### 🕐 Clocks
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- Analog Clock
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- Fuzzy Clock
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- Binary Clock
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- Word Clock
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### 📰 Information
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- News Headlines
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- RSS Feeds
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- GitHub Activity
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- Reddit Feed
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### 🚌 Transit & Travel
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- Transit Arrivals
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- Flight Tracker
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- Train Schedules
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## Display Size Compatibility
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Tronbyte/Tidbyt apps are designed for **64×32 displays**. LEDMatrix automatically adapts content for different display sizes:
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### Magnification
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The plugin calculates optimal magnification based on your display:
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```
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magnify = floor(min(display_width / 64, display_height / 32))
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```
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Examples:
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- **64×32**: magnify = 1 (native, pixel-perfect)
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- **128×64**: magnify = 2 (2x scaling, crisp)
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- **192×64**: magnify = 2 (2x + horizontal centering)
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- **256×64**: magnify = 2 (2x + centering)
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### Scaling Modes
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**Config → Starlark Apps → Scale Method:**
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- `nearest` (default): Sharp pixels, retro look
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- `bilinear`: Smooth scaling, slight blur
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- `bicubic`: Higher quality smooth scaling
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- `lanczos`: Best quality, most processing
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**Center vs Scale:**
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- `scale_output=true`: Stretch to fill display (may distort aspect ratio)
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- `center_small_output=true`: Center output without stretching (preserves aspect ratio)
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## Configuration Schema Extraction
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LEDMatrix automatically extracts configuration schemas from Starlark apps by parsing the `get_schema()` function in the `.star` source code.
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### Supported Field Types
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| Starlark Type | Web UI Rendering |
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|--------------|------------------|
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| `schema.Location` | Lat/Lng/Timezone picker |
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| `schema.Text` | Text input field |
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| `schema.Toggle` | Checkbox/switch |
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| `schema.Dropdown` | Select dropdown |
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| `schema.Color` | Color picker |
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| `schema.DateTime` | Date/time picker |
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| `schema.OAuth2` | Warning message (not supported) |
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| `schema.PhotoSelect` | Warning message (not supported) |
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| `schema.LocationBased` | Text fallback with note |
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| `schema.Typeahead` | Text fallback with note |
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### Schema Coverage
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- **90-95%** of apps: Full schema support
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- **5%**: Partial extraction (complex/dynamic schemas)
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- **<1%**: No schema (apps without configuration)
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Apps without extracted schemas can still run with default settings.
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## File Structure
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```
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LEDMatrix/
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├── plugin-repos/starlark-apps/ # Plugin source code
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│ ├── manager.py # Main plugin logic
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│ ├── pixlet_renderer.py # Pixlet CLI wrapper
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│ ├── frame_extractor.py # WebP decoder
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│ ├── tronbyte_repository.py # GitHub API client
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│ └── requirements.txt # Python dependencies
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│
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├── starlark-apps/ # Installed apps (user data)
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│ ├── manifest.json # App registry
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│ │
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│ └── analogclock/ # Example app
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│ ├── analogclock.star # Starlark source
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│ ├── config.json # User configuration
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│ ├── schema.json # Extracted schema
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│ ├── cached_render.webp # Rendered output cache
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│ └── images/ # App assets (if any)
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│ ├── hour_hand.png
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│ └── minute_hand.png
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│
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├── bin/pixlet/ # Pixlet binaries
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│ ├── pixlet-linux-amd64
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│ ├── pixlet-linux-arm64
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│ └── pixlet-darwin-arm64
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│
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└── scripts/
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└── download_pixlet.sh # Pixlet installer
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```
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## API Keys and External Services
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Many apps require API keys for external services:
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### Common API Services
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- **Weather**: OpenWeatherMap, Weather.gov, Dark Sky
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- **Sports**: ESPN, The Sports DB, SportsData.io
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- **Finance**: Alpha Vantage, CoinGecko, Yahoo Finance
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- **Transit**: TransitLand, NextBus, local transit APIs
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- **News**: NewsAPI, Reddit, RSS feeds
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### Security Note
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- API keys are stored in `config.json` files on disk
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- The LEDMatrix web interface does NOT encrypt API keys
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- Ensure your Raspberry Pi is on a trusted network
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- Use read-only or limited-scope API keys when possible
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- **Never commit `starlark-apps/*/config.json` to version control**
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## Troubleshooting
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### Pixlet Not Found
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**Symptom**: "Pixlet binary not found" error
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**Solutions**:
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1. Run auto-installer: **Plugins → Starlark Apps → Install Pixlet**
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2. Manual install: `bash scripts/download_pixlet.sh`
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3. Check permissions: `chmod +x bin/pixlet/pixlet-*`
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4. Verify architecture: `uname -m` matches binary name
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### App Fails to Render
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**Symptom**: "Rendering failed" error in logs
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**Solutions**:
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1. Check logs: `journalctl -u ledmatrix | grep -i pixlet`
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2. Verify config: Ensure all required fields are filled
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3. Test manually: `./bin/pixlet/pixlet-linux-amd64 render starlark-apps/{app-id}/{app-id}.star`
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4. Missing assets: Some apps need images/fonts that may fail to download
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5. API issues: Check API keys and rate limits
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### Schema Not Extracted
|
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|
||||
**Symptom**: App installs but shows no configuration options
|
||||
|
||||
**Solutions**:
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1. App may not have a `get_schema()` function (normal for some apps)
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2. Schema extraction failed: Check logs for parse errors
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3. Manual config: Edit `starlark-apps/{app-id}/config.json` directly
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4. Report issue: File bug with app details at LEDMatrix GitHub
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|
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### Apps Show Distorted/Wrong Size
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||||
|
||||
**Symptom**: Content appears stretched, squished, or cropped
|
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|
||||
**Solutions**:
|
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1. Check magnify setting: **Plugins → Starlark Apps → Config**
|
||||
2. Try `center_small_output=true` to preserve aspect ratio
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||||
3. Adjust `magnify` manually (1-8) for your display size
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||||
4. Some apps assume 64×32 - may not scale perfectly to all sizes
|
||||
|
||||
### App Shows Outdated Data
|
||||
|
||||
**Symptom**: Weather, sports scores, etc. don't update
|
||||
|
||||
**Solutions**:
|
||||
1. Check render interval: **App Config → Render Interval** (300s default)
|
||||
2. Force re-render: **Plugins → Starlark Apps → {App} → Render Now**
|
||||
3. Clear cache: Restart LEDMatrix service
|
||||
4. API rate limits: Some services throttle requests
|
||||
5. Check app logs for API errors
|
||||
|
||||
## Performance Considerations
|
||||
|
||||
### Render Intervals
|
||||
|
||||
- Apps re-render on a schedule (default: 300s = 5 minutes)
|
||||
- Lower intervals = more CPU/API usage
|
||||
- Recommended minimums:
|
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- Static content (clocks): 30-60s
|
||||
- Weather: 300s (5min)
|
||||
- Sports scores: 60-120s
|
||||
- Stock tickers: 60s
|
||||
|
||||
### Caching
|
||||
|
||||
Enable caching to reduce CPU load:
|
||||
- `cache_rendered_output=true` (recommended)
|
||||
- `cache_ttl=300` (5 minutes)
|
||||
|
||||
Cached WebP files are stored in `starlark-apps/{app-id}/cached_render.webp`
|
||||
|
||||
### Display Rotation
|
||||
|
||||
Balance number of enabled apps with display duration:
|
||||
- 5 apps × 15s = 75s full cycle
|
||||
- 20 apps × 15s = 300s (5min) cycle
|
||||
|
||||
Long cycles may cause apps to render before being displayed.
|
||||
|
||||
## Limitations
|
||||
|
||||
### Unsupported Features
|
||||
|
||||
- **OAuth2 Authentication**: Apps requiring OAuth login won't work
|
||||
- **PhotoSelect**: Image upload from mobile device not supported
|
||||
- **Push Notifications**: Apps can't receive real-time events
|
||||
- **Background Jobs**: No persistent background tasks
|
||||
|
||||
### API Rate Limits
|
||||
|
||||
Many apps use free API tiers with rate limits:
|
||||
- Rendering too frequently may exceed limits
|
||||
- Use appropriate `render_interval` settings
|
||||
- Consider paid API tiers for heavy usage
|
||||
|
||||
### Display Size Constraints
|
||||
|
||||
Apps designed for 64×32 may not utilize larger displays fully:
|
||||
- Content may appear small on 128×64+ displays
|
||||
- Magnification helps but doesn't add detail
|
||||
- Some apps hard-code 64×32 dimensions
|
||||
|
||||
## Advanced Usage
|
||||
|
||||
### Manual App Installation
|
||||
|
||||
Upload custom `.star` files:
|
||||
1. Navigate to **Starlark Apps → Upload**
|
||||
2. Select `.star` file from disk
|
||||
3. Configure app ID and metadata
|
||||
4. Set render/display timing
|
||||
|
||||
### Custom App Development
|
||||
|
||||
While LEDMatrix runs Tronbyte apps, you can also create your own:
|
||||
|
||||
1. **Learn Starlark**: [Tidbyt Developer Docs](https://tidbyt.dev/)
|
||||
2. **Write `.star` file**: Use Pixlet APIs for rendering
|
||||
3. **Test locally**: `pixlet render myapp.star`
|
||||
4. **Upload**: Use LEDMatrix web UI to install
|
||||
5. **Share**: Contribute to [Tronbyte Apps](https://github.com/tronbyt/apps) repo
|
||||
|
||||
### Configuration Reference
|
||||
|
||||
**Plugin Config** (`config/config.json` → `plugins.starlark-apps`):
|
||||
|
||||
```json
|
||||
{
|
||||
"enabled": true,
|
||||
"magnify": 0, // 0 = auto, 1-8 = manual
|
||||
"render_timeout": 30, // Max seconds for Pixlet render
|
||||
"cache_rendered_output": true, // Cache WebP files
|
||||
"cache_ttl": 300, // Cache duration (seconds)
|
||||
"scale_output": true, // Scale to display size
|
||||
"scale_method": "nearest", // nearest|bilinear|bicubic|lanczos
|
||||
"center_small_output": false, // Center instead of scale
|
||||
"default_frame_delay": 50, // Frame timing (ms)
|
||||
"max_frames": null, // Limit frames (null = unlimited)
|
||||
"auto_refresh_apps": true // Auto re-render on interval
|
||||
}
|
||||
```
|
||||
|
||||
**App Config** (`starlark-apps/{app-id}/config.json`):
|
||||
|
||||
```json
|
||||
{
|
||||
"location": "{\"lat\":\"40.7128\",\"lng\":\"-74.0060\",\"timezone\":\"America/New_York\"}",
|
||||
"units": "imperial",
|
||||
"api_key": "your-api-key-here",
|
||||
"render_interval": 300, // App-specific override
|
||||
"display_duration": 15 // App-specific override
|
||||
}
|
||||
```
|
||||
|
||||
## Resources
|
||||
|
||||
### Official Documentation
|
||||
|
||||
- **Tidbyt Developer Docs**: https://tidbyt.dev/
|
||||
- **Starlark Language**: https://github.com/bazelbuild/starlark
|
||||
- **Pixlet Repository**: https://github.com/tidbyt/pixlet
|
||||
- **Tronbyte Apps**: https://github.com/tronbyt/apps
|
||||
|
||||
### LEDMatrix Documentation
|
||||
|
||||
- [Plugin Development Guide](PLUGIN_DEVELOPMENT_GUIDE.md)
|
||||
- [REST API Reference](REST_API_REFERENCE.md)
|
||||
- [Troubleshooting Guide](TROUBLESHOOTING.md)
|
||||
|
||||
### Community
|
||||
|
||||
- **Tidbyt Community**: https://discuss.tidbyt.com/
|
||||
- **Tronbyte Apps Issues**: https://github.com/tronbyt/apps/issues
|
||||
- **LEDMatrix Issues**: https://github.com/ChuckBuilds/LEDMatrix/issues
|
||||
|
||||
## License and Legal
|
||||
|
||||
- **LEDMatrix**: MIT License (see project root)
|
||||
- **Starlark Apps Plugin**: MIT License (part of LEDMatrix)
|
||||
- **Pixlet**: Apache 2.0 License (Tidbyt Inc.)
|
||||
- **Tronbyte Apps**: Various licenses (see individual app headers)
|
||||
- **Starlark Language**: Apache 2.0 License (Google/Bazel)
|
||||
|
||||
**Disclaimer**: LEDMatrix is an independent project and is not affiliated with, endorsed by, or sponsored by Tidbyt Inc. The Starlark Apps plugin enables interoperability with Tidbyt's open-source ecosystem but does not imply any official relationship.
|
||||
|
||||
## Support
|
||||
|
||||
For issues with:
|
||||
- **LEDMatrix integration**: File issues at [LEDMatrix GitHub](https://github.com/ChuckBuilds/LEDMatrix/issues)
|
||||
- **Specific apps**: File issues at [Tronbyte Apps](https://github.com/tronbyt/apps/issues)
|
||||
- **Pixlet rendering**: File issues at [Pixlet Repository](https://github.com/tidbyt/pixlet/issues)
|
||||
|
||||
---
|
||||
|
||||
**Ready to get started?** Install the Starlark Apps plugin and explore 974+ community apps! 🎨
|
||||
Reference in New Issue
Block a user