feat: Workshop UI portal — dynamic module browser with language filtering#3
feat: Workshop UI portal — dynamic module browser with language filtering#3
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… HTML/CSS/JS frontend Co-authored-by: raykao <860691+raykao@users.noreply.github.com>
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Pull request overview
This PR introduces a new self-contained Node.js/Express “portal” app that dynamically scans the repo’s modules/ directory to serve module metadata and sanitized README HTML over an API, along with a small static frontend for browsing modules with Java/JavaScript filtering.
Changes:
- Added Express app + API routes (
/api/health,/api/modules,/api/modules/:moduleId) backed by a filesystem-scanning module service. - Implemented Markdown rendering (
marked) with HTML sanitization (sanitize-html) and request correlation logging. - Added a vanilla JS frontend (home + module detail pages) plus Jest unit/integration tests (supertest).
Reviewed changes
Copilot reviewed 30 out of 31 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
| portal/src/app.js | Express app factory wiring middleware, static assets, and API routers |
| portal/src/server.js | Server entrypoint + graceful shutdown hooks |
| portal/src/config/config.js | Portal runtime config (PORT, MODULES_DIR) |
| portal/src/errors/errors.js | Domain error types with statusCode for HTTP mapping |
| portal/src/middleware/requestLogger.js | Correlation ID + structured request/response logging |
| portal/src/middleware/inputValidator.js | Language + moduleId validation helpers |
| portal/src/middleware/errorHandler.js | Central error-to-HTTP mapping + safe 500 responses |
| portal/src/routes/healthRoutes.js | Health endpoint router |
| portal/src/routes/moduleRoutes.js | Module listing/detail API router |
| portal/src/services/moduleService.js | Module scanning, metadata parsing, README render, code file collection |
| portal/src/utils/markdownParser.js | Markdown → sanitized HTML utility |
| portal/public/index.html | Portal home page markup |
| portal/public/module.html | Module detail page markup |
| portal/public/js/api.js | Client fetch wrappers for module APIs |
| portal/public/js/home.js | Home page controller (module grid + language filter) |
| portal/public/js/module.js | Module detail controller (README render, code files, prev/next) |
| portal/public/css/main.css | Shared styling, layout, module cards, badges |
| portal/public/css/module.css | Module detail layout + typography/code styles |
| portal/test/integration/api.test.js | Integration tests hitting real modules directory |
| portal/test/unit/routes/healthRoutes.test.js | Unit tests for health route behavior |
| portal/test/unit/routes/moduleRoutes.test.js | Unit tests for module routes + validation behavior |
| portal/test/unit/services/moduleService.test.js | Unit tests for service scanning + metadata parsing |
| portal/test/unit/utils/markdownParser.test.js | Unit tests for markdown rendering + sanitization behavior |
| portal/test/unit/middleware/inputValidator.test.js | Unit tests for language/moduleId validators |
| portal/test/unit/middleware/errorHandler.test.js | Unit tests for error-to-HTTP mapping and stack non-exposure |
| portal/package.json | Portal dependencies + scripts |
| portal/jest.config.js | Jest config for portal tests + coverage collection |
| portal/README.md | Portal setup/run/API documentation |
| portal/.gitignore | Ignores node_modules/coverage/.env |
| portal/.env.example | Example env vars for running locally |
Comments suppressed due to low confidence (1)
portal/public/js/module.js:129
- The PR description states that no untrusted server data is rendered via
innerHTML, but the module page assignsmod.readmeHtml(API response) directly toreadme.innerHTML. Either update the PR description to reflect that sanitized HTML is intentionally inserted, or change the client rendering approach (e.g., sanitize again client-side / DOM-based rendering) to match the claim.
if (mod.readmeHtml) {
readme.innerHTML = mod.readmeHtml;
readme.classList.remove('hidden');
| const entries = await fs.readdir(MODULES_DIR, { withFileTypes: true }); | ||
| return entries | ||
| .filter(e => e.isDirectory() && MODULE_DIR_REGEX.test(e.name)) | ||
| .map(e => e.name) | ||
| .sort(); |
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scanModuleDirectories will throw if MODULES_DIR is missing/unreadable (e.g., ENOENT), which will surface as a 500 from /api/modules. Since this service is meant to be runnable from different working directories/environments, consider catching ENOENT here and returning an empty list (or throwing a typed domain error with a clear message/status) so the API fails more gracefully.
| const entries = await fs.readdir(MODULES_DIR, { withFileTypes: true }); | |
| return entries | |
| .filter(e => e.isDirectory() && MODULE_DIR_REGEX.test(e.name)) | |
| .map(e => e.name) | |
| .sort(); | |
| try { | |
| const entries = await fs.readdir(MODULES_DIR, { withFileTypes: true }); | |
| return entries | |
| .filter(e => e.isDirectory() && MODULE_DIR_REGEX.test(e.name)) | |
| .map(e => e.name) | |
| .sort(); | |
| } catch (error) { | |
| if (error?.code === 'ENOENT') { | |
| return []; | |
| } | |
| throw error; | |
| } |
| /** | ||
| * Returns full detail for one module. | ||
| * @param {string} moduleId | ||
| * @param {string|undefined} language | ||
| * @returns {Promise<ModuleDetail>} | ||
| * @throws {ModuleNotFoundError} |
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The JSDoc for getModule references ModuleDetail in @returns, but that typedef isn't declared in this file. Define a @typedef {Object} ModuleDetail (or reuse an existing type) so editors/linters can resolve the type correctly.
| Run the single setup command from the **repository root**: | ||
|
|
||
| ```bash | ||
| node setup-portal.js && cd portal && npm install && npm test | ||
| ``` | ||
|
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| That command: | ||
| 1. Creates the `portal/` directory tree with all source files | ||
| 2. Installs Node.js dependencies | ||
| 3. Runs the full test suite (unit + integration) | ||
|
|
||
| ## What `setup-portal.js` Creates |
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The Quick Start and section title reference setup-portal.js, but there is no such script in the repository. This makes the setup instructions misleading. Update the README to describe the actual setup steps (e.g., cd portal && npm install && npm test) or add the missing script if it’s intended to exist.
| class ModuleNotFoundError extends Error { | ||
| constructor(moduleId) { | ||
| super(`Module '${moduleId}' not found`); | ||
| this.name = 'ModuleNotFoundError'; | ||
| this.moduleId = moduleId; | ||
| this.statusCode = 404; | ||
| } | ||
| } | ||
|
|
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| class InvalidLanguageError extends Error { | ||
| constructor(language) { | ||
| super(`language must be 'java' or 'javascript', got: '${language}'`); | ||
| this.name = 'InvalidLanguageError'; | ||
| this.language = language; | ||
| this.statusCode = 400; | ||
| } | ||
| } | ||
|
|
||
| class InvalidModuleIdError extends Error { | ||
| constructor(moduleId) { | ||
| super(`Invalid moduleId format: '${moduleId}'`); | ||
| this.name = 'InvalidModuleIdError'; | ||
| this.moduleId = moduleId; | ||
| this.statusCode = 400; | ||
| } | ||
| } |
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The custom error classes are public API for the portal, but they don’t have any JSDoc explaining when each is thrown and what fields (moduleId, language, statusCode) are available. Adding brief class-level JSDoc (and documenting the extra properties) would improve editor hints and keep the portal’s public surface consistent with the rest of the code’s JSDoc usage.
| * @param {string|undefined} language | ||
| * @returns {string|undefined} | ||
| * @throws {InvalidLanguageError} | ||
| */ | ||
| const validateLanguage = (language) => { | ||
| if (language === undefined || language === '') return undefined; |
There was a problem hiding this comment.
validateLanguage assumes req.query.language is a string, but Express can provide non-string values (e.g., an array when language is repeated: ?language=java&language=javascript). Calling toLowerCase() on a non-string will throw and likely return a 500. Add a typeof language !== 'string' guard (and reject with InvalidLanguageError), and consider adding a unit/integration test for repeated query params.
| * @param {string|undefined} language | |
| * @returns {string|undefined} | |
| * @throws {InvalidLanguageError} | |
| */ | |
| const validateLanguage = (language) => { | |
| if (language === undefined || language === '') return undefined; | |
| * @param {string|string[]|undefined} language | |
| * @returns {string|undefined} | |
| * @throws {InvalidLanguageError} | |
| */ | |
| const validateLanguage = (language) => { | |
| if (language === undefined || language === '') return undefined; | |
| if (typeof language !== 'string') throw new InvalidLanguageError(language); |
| codeFiles.forEach(({ filename, language, content }) => { | ||
| const block = document.createElement('div'); | ||
| block.className = 'code-file-block'; | ||
| block.innerHTML = ` | ||
| <div class="code-file-header"> | ||
| <span class="badge badge-${language}">${language}</span> | ||
| <span>${escapeHtml(filename)}</span> | ||
| </div> | ||
| <div class="code-file-content"><code>${escapeHtml(content)}</code></div> | ||
| `; |
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renderCodeFiles builds HTML with innerHTML and interpolates language directly into the template (badge-${language} and ${language}) without escaping. If language ever contains unexpected characters, this can become a DOM XSS/vector via attribute breaking. Prefer creating the badge/span elements via document.createElement, setting textContent, and using classList.add('badge', badge-${language}) only after validating language against an allowlist (or escape it).
This issue also appears on line 127 of the same file.
| for (const { relativePath, filename } of collected) { | ||
| const fullPath = path.join(moduleDir, relativePath); | ||
| const content = await fs.readFile(fullPath, 'utf-8'); | ||
| files.push({ filename, language: lang, relativePath, content }); | ||
| } |
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collectCodeFiles reads each file sequentially (await fs.readFile inside a for loop). For modules with many files this increases latency linearly and can slow down the module detail endpoint. Consider reading file contents in parallel (e.g., Promise.all over collected) and/or adding a concurrency limit to balance speed vs. resource usage.
| for (const { relativePath, filename } of collected) { | |
| const fullPath = path.join(moduleDir, relativePath); | |
| const content = await fs.readFile(fullPath, 'utf-8'); | |
| files.push({ filename, language: lang, relativePath, content }); | |
| } | |
| await Promise.all( | |
| collected.map(async ({ relativePath, filename }) => { | |
| const fullPath = path.join(moduleDir, relativePath); | |
| const content = await fs.readFile(fullPath, 'utf-8'); | |
| files.push({ filename, language: lang, relativePath, content }); | |
| }), | |
| ); |
Adds a self-contained Node.js/Express web portal (
portal/) so workshop participants can browse modules, select their preferred language (Java or JavaScript), and view rendered module content and code exercises dynamically — replacing static README navigation.Backend (
portal/src/)GET /api/modules[?language=java|javascript]andGET /api/modules/:moduleId[?language=]serve module metadata and sanitized README HTML parsed from the repo'smodules/directory at runtimemodules/fs tree, extracts title/duration/format from README frontmatter patterns, detects language availability via file extension and directory presence, guards against path traversal with allowlist regex +resolvedDir.startsWith(resolvedBase)checkvalidateModuleIdenforces^module-\d{2}-[a-z0-9-]+$before any fs I/O;validateLanguagenormalises case and rejects unknown values — both throw typed domain errors (statusCodeproperty drives the error handler, noinstanceofchain)marked→sanitize-htmlwith explicit tag/attribute allowlist;transformTagsenforcesrel="noopener noreferrer"ontarget="_blank"linksX-Correlation-IDresponse header; gracefulSIGTERM/SIGINTshutdownFrontend (
portal/public/)localStorage, filter applied via API query paramelement.textContent/ DOM API — noinnerHTMLinterpolation of API-sourced stringsTests
62 tests across 7 suites (unit + integration via supertest), including dedicated coverage for
inputValidator(path traversal attempts, case normalisation) andmarkdownParser(XSS removal, null guard,relinjection).Run with
cd portal && npm install && npm start(default port 3000).Original prompt
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