Add hosted HTML apps prototype to Shopify CLI #6796
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This commit implements a prototype for hosted HTML applications in the Shopify CLI, based on technical requirements for static/hosted apps. ## Key Features - New `hosted_html` extension type specification - Support for pure HTML/CSS/JS apps (no React required) - Iframe sandboxing with srcdoc for security isolation - Hash-based routing support via postMessage API - Static file serving with comprehensive MIME type support - File validation (size limits, HTTPS enforcement) - Dev server integration with sandboxed rendering ## Files Added - `hosted_html.ts`: Extension specification with validation - Middleware: `getHostedHtmlMiddleware()` for sandboxed serving - Test app: Complete sample hosted HTML application - Documentation: HOSTED_HTML_PROTOTYPE.md ## Implementation Details ### Security Model - Iframe with srcdoc creates null origin for isolation - Sandbox attributes: allow-scripts, allow-same-origin, allow-forms - CSP headers restrict frame ancestors - HTTPS enforcement for external resources - 50MB bundle size limit ### Build System - Uses existing `copy_files` build mode - Copies HTML, CSS, JS, images, fonts to dist/ - Validates file types and sizes - Ignores node_modules, .git, test files ### Dev Server - New route handler for hosted_html extensions - Wraps content in sandboxed iframe wrapper - Supports client-side navigation via postMessage - Serves assets from build directory ## Technical Background Based on internal tech docs and discussions about: - Asset management and CDN scalability - Security sandboxing similar to UI extensions - Content-addressable hashing for assets (future work) - Direct API access by default - Escape hatch from UI Extensions framework ## Testing Sample test app included in `test-hosted-app/`: - Demonstrates pure HTML/CSS/JS structure - Client-side routing example - Sandboxed execution validation - Mock API integration ## Future Work - AMF module integration for deployment - Content-addressable asset hashing - Image optimization service integration - Subdomain isolation per app - Session token support for Shopify API 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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This commit implements a prototype for hosted HTML applications in the Shopify CLI, based on technical requirements for static/hosted apps.
Key Features
hosted_htmlextension type specificationFiles Added
hosted_html.ts: Extension specification with validationgetHostedHtmlMiddleware()for sandboxed servingImplementation Details
Security Model
Build System
copy_filesbuild modeDev Server
Technical Background
Based on internal tech docs and discussions about:
Testing
Sample test app included in
test-hosted-app/:Future Work
🤖 Generated with Claude Code
WHY are these changes introduced?
Fixes #0000
WHAT is this pull request doing?
How to test your changes?
Post-release steps
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