From 5c1ce581b858fee16c4f52f4b80299e0804d8a18 Mon Sep 17 00:00:00 2001 From: TamLa21297 Date: Sun, 3 May 2026 23:13:57 +0700 Subject: [PATCH] [BE] Code challenge - La Thanh Tam --- .gitignore | 22 + src/problem4/README.md | 54 + src/problem4/package-lock.json | 1434 ++++++++++++++++ src/problem4/package.json | 12 + src/problem4/sum_to_n.test.ts | 43 + src/problem4/sum_to_n.ts | 38 + src/problem4/tsconfig.json | 12 + src/problem4/vitest.config.ts | 8 + src/problem5/.env.example | 2 + src/problem5/README.md | 149 ++ src/problem5/data/app.db-shm | Bin 0 -> 32768 bytes src/problem5/data/app.db-wal | Bin 0 -> 32992 bytes src/problem5/data/smoke.db-shm | Bin 0 -> 32768 bytes src/problem5/data/smoke.db-wal | Bin 0 -> 32992 bytes src/problem5/data/test.db-shm | Bin 0 -> 32768 bytes src/problem5/data/test.db-wal | Bin 0 -> 20632 bytes src/problem5/package-lock.json | 2013 +++++++++++++++++++++++ src/problem5/package.json | 24 + src/problem5/src/app.ts | 24 + src/problem5/src/db.ts | 32 + src/problem5/src/functions/resources.ts | 182 ++ src/problem5/src/index.ts | 23 + src/problem5/src/mappers.ts | 12 + src/problem5/src/repository.ts | 96 ++ src/problem5/src/routes/resources.ts | 49 + src/problem5/src/types.ts | 38 + src/problem5/tsconfig.json | 15 + src/problem6/IMPROVEMENTS.md | 43 + src/problem6/README.md | 207 +++ 29 files changed, 4532 insertions(+) create mode 100644 .gitignore create mode 100644 src/problem4/README.md create mode 100644 src/problem4/package-lock.json create mode 100644 src/problem4/package.json create mode 100644 src/problem4/sum_to_n.test.ts create mode 100644 src/problem4/sum_to_n.ts create mode 100644 src/problem4/tsconfig.json create mode 100644 src/problem4/vitest.config.ts create mode 100644 src/problem5/.env.example create mode 100644 src/problem5/README.md create mode 100644 src/problem5/data/app.db-shm create mode 100644 src/problem5/data/app.db-wal create mode 100644 src/problem5/data/smoke.db-shm create mode 100644 src/problem5/data/smoke.db-wal create mode 100644 src/problem5/data/test.db-shm create mode 100644 src/problem5/data/test.db-wal create mode 100644 src/problem5/package-lock.json create mode 100644 src/problem5/package.json create mode 100644 src/problem5/src/app.ts create mode 100644 src/problem5/src/db.ts create mode 100644 src/problem5/src/functions/resources.ts create mode 100644 src/problem5/src/index.ts create mode 100644 src/problem5/src/mappers.ts create mode 100644 src/problem5/src/repository.ts create mode 100644 src/problem5/src/routes/resources.ts create mode 100644 src/problem5/src/types.ts create mode 100644 src/problem5/tsconfig.json create mode 100644 src/problem6/IMPROVEMENTS.md create mode 100644 src/problem6/README.md diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000000..429baa55d1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,22 @@ +# Dependencies +*node_modules/ + +# TypeScript build output +dist/ +*.tsbuildinfo + +# Tests / coverage +coverage/ + +# Logs & env +*.log +.env +.env.* +!.env.example + +# OS +.DS_Store +Thumbs.db +.history/ +*.db +*.db-journal diff --git a/src/problem4/README.md b/src/problem4/README.md new file mode 100644 index 0000000000..22b2349f66 --- /dev/null +++ b/src/problem4/README.md @@ -0,0 +1,54 @@ +# Problem 4: Summation to n + +This folder contains three TypeScript implementations of the **triangular number** (sum of integers from 1 through n inclusive) + +Example: `sum_to_n(5) === 1 + 2 + 3 + 4 + 5 === 15`. + +**Assumption:** The mathematical result is always less than `Number.MAX_SAFE_INTEGER` (so you stay in the range where double-precision arithmetic in JavaScript is exact for these integers). + +## Files + +| File | Purpose | +| ------------------ | ----------------------------------------------------------------------------- | +| `sum_to_n.ts` | Three exported functions: `sum_to_n_a`, `sum_to_n_b`, `sum_to_n_c` | +| `sum_to_n.test.ts` | Vitest checks against known values and cross-checks all three implementations | +| `tsconfig.json` | Strict TypeScript; `module` / `moduleResolution` set to `Node16` | +| `vitest.config.ts` | Runs tests in Node against `*.test.ts` | + +## Implementations + +| Function | Approach | Time | Extra space | +| ------------ | ------------------------ | ---- | ------------ | +| `sum_to_n_a` | Closed form \(n(n+1)/2\) | O(1) | O(1) | +| `sum_to_n_b` | Iterative `for` loop | O(n) | O(1) | +| `sum_to_n_c` | `Array.from` + `reduce` | O(n) | O(n) (array) | + +For large nonnegative `n`, **`sum_to_n_a`** does the least work. **`sum_to_n_b`** is straightforward and allocation-free. **`sum_to_n_c`** mirrors a functional style but pays for building an array. + +## Setup + +From this directory: + +```bash +npm install +``` + +## Tests + +```bash +npm test +``` + +Runs Vitest once (`vitest run`). For watch mode while editing: + +```bash +npx vitest +``` + +## Compile (optional) + +Emit JavaScript into `dist/`: + +```bash +npx tsc -p . +``` diff --git a/src/problem4/package-lock.json b/src/problem4/package-lock.json new file mode 100644 index 0000000000..23a9f9faad --- /dev/null +++ b/src/problem4/package-lock.json @@ -0,0 +1,1434 @@ +{ + "name": "problem4", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "problem4", + "devDependencies": { + "typescript": "^5.4.5", + "vitest": "^2.1.9" + } + }, + "node_modules/@esbuild/aix-ppc64": { + "version": "0.21.5", + "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz", + "integrity": "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ==", + "cpu": [ + "ppc64" + ], + "dev": true, + "license": "MIT", + "optional": true, + "os": [ + "aix" + ], + "engines": { + "node": ">=12" + } + }, + "node_modules/@esbuild/android-arm": { + "version": 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"vitest"; +import { sum_to_n_a, sum_to_n_b, sum_to_n_c } from "./sum_to_n.js"; + +describe("sum_to_n", () => { + const cases: { n: number; expected: number }[] = [ + { n: 5, expected: 15 }, + { n: 0, expected: 0 }, + { n: 1, expected: 1 }, + { n: 100, expected: 5050 }, + ]; + + for (const { n, expected } of cases) { + it(`sum_to_n_a(${n}) === ${expected}`, () => { + expect(sum_to_n_a(n)).toBe(expected); + }); + it(`sum_to_n_b(${n}) === ${expected}`, () => { + expect(sum_to_n_b(n)).toBe(expected); + }); + it(`sum_to_n_c(${n}) === ${expected}`, () => { + expect(sum_to_n_c(n)).toBe(expected); + }); + } + + it("implementations agree for several values", () => { + for (const n of [0, 1, 2, 10, 50, 123]) { + const a = sum_to_n_a(n); + expect(sum_to_n_b(n)).toBe(a); + expect(sum_to_n_c(n)).toBe(a); + } + }); + + it("logs to console.error and throws RangeError when n < 0", () => { + const spy = vi.spyOn(console, "error").mockImplementation(() => {}); + + for (const fn of [sum_to_n_a, sum_to_n_b, sum_to_n_c] as const) { + expect(() => fn(-1)).toThrow(RangeError); + expect(() => fn(-1)).toThrow(/non-negative/); + } + + expect(spy).toHaveBeenCalled(); + spy.mockRestore(); + }); +}); diff --git a/src/problem4/sum_to_n.ts b/src/problem4/sum_to_n.ts new file mode 100644 index 0000000000..c1af751658 --- /dev/null +++ b/src/problem4/sum_to_n.ts @@ -0,0 +1,38 @@ +/** + * Summation 1 + 2 + … + n (triangular number). + * Assumes the mathematical result is < Number.MAX_SAFE_INTEGER. + * Requires n >= 0; otherwise logs to stderr and throws. + * Log error if n < 0. + */ + +function requireNonNegative(n: number, label: string): void { + if (n < 0) { + console.error(`[${label}] n must be >= 0, got:`, n); + throw new RangeError(`${label}: n must be non-negative, got ${n}`); + } +} + +/** O(1) time, O(1) space — single arithmetic expression. */ +export function sum_to_n_a(n: number): number { + requireNonNegative(n, "sum_to_n_a"); + return (n * (n + 1)) / 2; +} + +/** O(n) time, O(1) space — linear passes, no extra allocations. */ +export function sum_to_n_b(n: number): number { + requireNonNegative(n, "sum_to_n_b"); + let sum = 0; + for (let i = 1; i <= n; i++) { + sum += i; + } + return sum; +} + +/** O(n) time, O(n) space — allocates an array of length n; clearer functional style. */ +export function sum_to_n_c(n: number): number { + requireNonNegative(n, "sum_to_n_c"); + return Array.from({ length: n }, (_, i) => i + 1).reduce( + (acc, x) => acc + x, + 0, + ); +} diff --git a/src/problem4/tsconfig.json b/src/problem4/tsconfig.json new file mode 100644 index 0000000000..0f8f3c9188 --- /dev/null +++ b/src/problem4/tsconfig.json @@ -0,0 +1,12 @@ +{ + "compilerOptions": { + "target": "ES2020", + "module": "Node16", + "moduleResolution": "Node16", + "strict": true, + "declaration": true, + "outDir": "dist", + "rootDir": "." + }, + "include": ["*.ts"] +} diff --git a/src/problem4/vitest.config.ts b/src/problem4/vitest.config.ts new file mode 100644 index 0000000000..a574e804e4 --- /dev/null +++ b/src/problem4/vitest.config.ts @@ -0,0 +1,8 @@ +import { defineConfig } from "vitest/config"; + +export default defineConfig({ + test: { + environment: "node", + include: ["*.test.ts"], + }, +}); diff --git a/src/problem5/.env.example b/src/problem5/.env.example new file mode 100644 index 0000000000..fc0388faee --- /dev/null +++ b/src/problem5/.env.example @@ -0,0 +1,2 @@ +PORT=3000 +DATABASE_PATH=./data/app.db diff --git a/src/problem5/README.md b/src/problem5/README.md new file mode 100644 index 0000000000..f9f238d1fb --- /dev/null +++ b/src/problem5/README.md @@ -0,0 +1,149 @@ +# Express CRUD API (TypeScript) + +Backend service built with **Express** and **TypeScript**. Resources are stored in **SQLite** via `better-sqlite3`. + +## Prerequisites + +- **Node.js** 18+ (recommended: current LTS) +- npm (comes with Node.js) + +On Windows, native addons such as `better-sqlite3` may require [build tools for Visual Studio](https://visualstudio.microsoft.com/visual-cpp-build-tools/) if prebuilt binaries are not available for your Node version. + +## Configuration + +1. Copy the example environment file and adjust if needed: + + ```bash + copy .env.example .env + ``` + + On Unix-like shells: + + ```bash + cp .env.example .env + ``` + +2. Environment variables: + + | Variable | Description | Default | + | --------------- | ---------------------------------------------- | --------------- | + | `PORT` | HTTP port | `3000` | + | `DATABASE_PATH` | Path to the SQLite file (relative or absolute) | `./data/app.db` | + + The `data` directory is created automatically when the server starts. + +## Install and run + +```bash +cd problem5 +npm install +``` + +**Development** (auto-reload on file changes): + +```bash +npm run dev +``` + +**Production build**: + +```bash +npm run build +npm start +``` + +The server listens on `http://localhost:` (default `3000`). A health check is available at `GET /health`. + +## API: resources CRUD + +Base path: `/api/resources` + +| Method | Path | Description | +| -------- | -------------------- | ------------------------------ | +| `POST` | `/api/resources` | Create a resource | +| `GET` | `/api/resources` | List resources (filters below) | +| `GET` | `/api/resources/:id` | Get one resource by id | +| `PUT` | `/api/resources/:id` | Update a resource (partial) | +| `DELETE` | `/api/resources/:id` | Delete a resource | + +### List filters (query string) + +| Query | Description | +| -------- | ----------------------------------------------------------- | +| `status` | `draft`, `active`, or `archived` | +| `q` | Case-sensitive substring match on `title` and `description` | +| `limit` | Page size (default `50`, max `200`) | +| `offset` | Offset for pagination (default `0`) | + +Example: `GET /api/resources?status=active&q=report&limit=10&offset=0` + +### Resource JSON shape + +```json +{ + "id": 1, + "title": "Example", + "description": "Optional text", + "status": "draft", + "createdAt": "2026-05-02T12:00:00", + "updatedAt": "2026-05-02T12:00:00" +} +``` + +### Create (`POST /api/resources`) + +Body: + +```json +{ + "title": "Required title", + "description": "Optional", + "status": "draft" +} +``` + +`status` is optional (defaults to `draft`). `description` may be omitted, a string, or `null`. + +### Update (`PUT /api/resources/:id`) + +Send any subset of `title`, `description`, `status`. At least one field is required. + +### Delete (`DELETE /api/resources/:id`) + +Returns `204 No Content` on success. + +## Example (curl) + +```bash +# Create +curl -s -X POST http://localhost:3000/api/resources ^ + -H "Content-Type: application/json" ^ + -d "{\"title\":\"My item\",\"status\":\"active\"}" + +# List with filter +curl -s "http://localhost:3000/api/resources?status=active" + +# Get by id +curl -s http://localhost:3000/api/resources/1 + +# Update +curl -s -X PUT http://localhost:3000/api/resources/1 ^ + -H "Content-Type: application/json" ^ + -d "{\"title\":\"Updated\"}" + +# Delete +curl -s -X DELETE http://localhost:3000/api/resources/1 +``` + +On macOS/Linux, use `\` instead of `^` for line continuation, or single-line commands. + +## Project layout + +- `src/index.ts` — entry, HTTP server, graceful shutdown +- `src/app.ts` — Express app and routes +- `src/db.ts` — SQLite connection and schema +- `src/repository.ts` — data access +- `src/routes/resources.ts` — REST 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"@types/express": "^4.17.21", + "@types/node": "^22.10.1", + "tsx": "^4.19.2", + "typescript": "^5.4.5" + } +} diff --git a/src/problem5/src/app.ts b/src/problem5/src/app.ts new file mode 100644 index 0000000000..9733584226 --- /dev/null +++ b/src/problem5/src/app.ts @@ -0,0 +1,24 @@ +import cors from "cors"; +import express from "express"; +import type Database from "better-sqlite3"; +import { ResourceRepository } from "./repository.js"; +import { createResourcesRouter } from "./routes/resources.js"; + +export function createApp(db: Database.Database) { + const app = express(); + app.use(cors()); + app.use(express.json()); + + const repo = new ResourceRepository(db); + app.use("/api/resources", createResourcesRouter(repo)); + + app.get("/health", (_req, res) => { + res.json({ ok: true }); + }); + + app.use((_req, res) => { + res.status(404).json({ error: "Not found." }); + }); + + return app; +} diff --git a/src/problem5/src/db.ts b/src/problem5/src/db.ts new file mode 100644 index 0000000000..469b2250d7 --- /dev/null +++ b/src/problem5/src/db.ts @@ -0,0 +1,32 @@ +import Database from "better-sqlite3"; +import fs from "node:fs"; +import path from "node:path"; + +function resolveDbPath(): string { + const fromEnv = process.env.DATABASE_PATH; + if (fromEnv) { + return path.isAbsolute(fromEnv) + ? fromEnv + : path.resolve(process.cwd(), fromEnv); + } + return path.join(process.cwd(), "data", "app.db"); +} + +export function openDatabase(): Database.Database { + const dbPath = resolveDbPath(); + fs.mkdirSync(path.dirname(dbPath), { recursive: true }); + const db = new Database(dbPath); + db.pragma("journal_mode = WAL"); + db.exec(` + CREATE TABLE IF NOT EXISTS resources ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + title TEXT NOT NULL, + description TEXT, + status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'active', 'archived')), + created_at TEXT NOT NULL DEFAULT (datetime('now')), + updated_at TEXT NOT NULL DEFAULT (datetime('now')) + ); + CREATE INDEX IF NOT EXISTS idx_resources_status ON resources (status); + `); + return db; +} diff --git a/src/problem5/src/functions/resources.ts b/src/problem5/src/functions/resources.ts new file mode 100644 index 0000000000..106d9c3ac7 --- /dev/null +++ b/src/problem5/src/functions/resources.ts @@ -0,0 +1,182 @@ +import type { Request, Response } from "express"; +import type { ResourceRepository } from "../repository.js"; +import { rowToResource } from "../mappers.js"; +import type { + CreateResourceInput, + ListResourcesQuery, + ResourceStatus, + UpdateResourceInput, +} from "../types.js"; + +const STATUSES: ResourceStatus[] = ["draft", "active", "archived"]; + +/** Returns a valid status or undefined if missing/invalid (caller may return 400). */ +function parseStatus(value: unknown): ResourceStatus | undefined { + if (typeof value !== "string") return undefined; + return STATUSES.includes(value as ResourceStatus) + ? (value as ResourceStatus) + : undefined; +} + +/** Parses a query param as a finite integer; undefined if absent or not a number. */ +function parseOptionalInt(value: unknown): number | undefined { + if (value === undefined || value === null || value === "") return undefined; + const n = Number(value); + return Number.isFinite(n) ? Math.trunc(n) : undefined; +} + +/** Lists resources with optional status/text filters and pagination controls. */ +export function listResources( + repo: ResourceRepository, + req: Request, + res: Response, +) { + const status = parseStatus(req.query.status); + const q = typeof req.query.q === "string" ? req.query.q : undefined; + const limit = parseOptionalInt(req.query.limit); + const offset = parseOptionalInt(req.query.offset); + + if (req.query.status !== undefined && status === undefined) { + res.status(400).json({ + error: "Invalid status; use draft, active, or archived.", + }); + return; + } + + const query: ListResourcesQuery = { + ...(status !== undefined && { status }), + ...(q !== undefined && { q }), + ...(limit !== undefined && { limit }), + ...(offset !== undefined && { offset }), + }; + + const rows = repo.list(query); + res.json({ items: rows.map(rowToResource) }); +} + +/** Returns one resource by numeric id, with 400/404 guards for invalid or missing data. */ +export function getResourceById( + repo: ResourceRepository, + req: Request, + res: Response, +) { + const id = Number(req.params.id); + if (!Number.isInteger(id) || id < 1) { + res.status(400).json({ error: "Invalid id." }); + return; + } + const row = repo.findById(id); + if (!row) { + res.status(404).json({ error: "Resource not found." }); + return; + } + res.json(rowToResource(row)); +} + +/** Validates payload and creates a new resource, returning 201 with mapped API shape. */ +export function createResource( + repo: ResourceRepository, + req: Request, + res: Response, +) { + const body = req.body as Partial; + if (typeof body.title !== "string" || body.title.trim() === "") { + console.error(body); + res + .status(400) + .json({ error: "title is required and must be a non-empty string." }); + return; + } + const status = parseStatus(body.status); + if (body.status !== undefined && status === undefined) { + res.status(400).json({ + error: "Invalid status; use draft, active, or archived.", + }); + return; + } + let description: string | null = null; + if (body.description !== undefined) { + if (body.description === null) description = null; + else if (typeof body.description === "string") + description = body.description; + else { + res.status(400).json({ error: "description must be a string or null." }); + return; + } + } + + const input: CreateResourceInput = { + title: body.title.trim(), + description, + ...(status !== undefined && { status }), + }; + const row = repo.create(input); + res.status(201).json(rowToResource(row)); +} + +/** Applies partial updates to a resource and rejects empty update payloads. */ +export function updateResource( + repo: ResourceRepository, + req: Request, + res: Response, +) { + const id = Number(req.params.id); + if (!Number.isInteger(id) || id < 1) { + res.status(400).json({ error: "Invalid id." }); + return; + } + const body = req.body as Partial; + const status = parseStatus(body.status); + if (body.status !== undefined && status === undefined) { + res.status(400).json({ + error: "Invalid status; use draft, active, or archived.", + }); + return; + } + const input: UpdateResourceInput = {}; + if (body.title !== undefined) { + if (typeof body.title !== "string" || body.title.trim() === "") { + res + .status(400) + .json({ error: "title must be a non-empty string when provided." }); + return; + } + input.title = body.title.trim(); + } + if (body.description !== undefined) { + input.description = + typeof body.description === "string" ? body.description : null; + } + if (status !== undefined) input.status = status; + + if (Object.keys(input).length === 0) { + res.status(400).json({ error: "Provide at least one field to update." }); + return; + } + + const row = repo.update(id, input); + if (!row) { + res.status(404).json({ error: "Resource not found." }); + return; + } + res.json(rowToResource(row)); +} + +/** Deletes a resource by id and responds with 204 when deletion succeeds. */ +export function deleteResource( + repo: ResourceRepository, + req: Request, + res: Response, +) { + const id = Number(req.params.id); + if (!Number.isInteger(id) || id < 1) { + res.status(400).json({ error: "Invalid id." }); + return; + } + const deleted = repo.delete(id); + if (!deleted) { + res.status(404).json({ error: "Resource not found." }); + return; + } + res.status(204).send(); +} diff --git a/src/problem5/src/index.ts b/src/problem5/src/index.ts new file mode 100644 index 0000000000..a36b3ae2a4 --- /dev/null +++ b/src/problem5/src/index.ts @@ -0,0 +1,23 @@ +import "dotenv/config"; +import { createServer } from "node:http"; +import { openDatabase } from "./db.js"; +import { createApp } from "./app.js"; + +const port = Number(process.env.PORT) || 3000; +const db = openDatabase(); +const app = createApp(db); +const server = createServer(app); + +server.listen(port, () => { + console.log(`Server listening on http://localhost:${port}`); +}); + +function shutdown() { + server.close(() => { + db.close(); + process.exit(0); + }); +} + +process.on("SIGINT", shutdown); +process.on("SIGTERM", shutdown); diff --git a/src/problem5/src/mappers.ts b/src/problem5/src/mappers.ts new file mode 100644 index 0000000000..bc289722d6 --- /dev/null +++ b/src/problem5/src/mappers.ts @@ -0,0 +1,12 @@ +import type { Resource, ResourceRow } from "./types.js"; + +export function rowToResource(row: ResourceRow): Resource { + return { + id: row.id, + title: row.title, + description: row.description, + status: row.status, + createdAt: row.created_at, + updatedAt: row.updated_at, + }; +} diff --git a/src/problem5/src/repository.ts b/src/problem5/src/repository.ts new file mode 100644 index 0000000000..0f3dba23c7 --- /dev/null +++ b/src/problem5/src/repository.ts @@ -0,0 +1,96 @@ +import type Database from "better-sqlite3"; +import type { + CreateResourceInput, + ListResourcesQuery, + ResourceRow, + UpdateResourceInput, +} from "./types.js"; + +export class ResourceRepository { + constructor(private readonly db: Database.Database) {} + + create(input: CreateResourceInput): ResourceRow { + const status = input.status ?? "draft"; + const stmt = this.db.prepare(` + INSERT INTO resources (title, description, status) + VALUES (@title, @description, @status) + RETURNING id, title, description, status, created_at, updated_at + `); + return stmt.get({ + title: input.title, + description: input.description ?? null, + status, + }) as ResourceRow; + } + + findById(id: number): ResourceRow | undefined { + const stmt = this.db.prepare(` + SELECT id, title, description, status, created_at, updated_at + FROM resources WHERE id = ? + `); + return stmt.get(id) as ResourceRow | undefined; + } + + list(filters: ListResourcesQuery): ResourceRow[] { + const conditions: string[] = []; + const params: Record = {}; + + if (filters.status) { + conditions.push("status = @status"); + params.status = filters.status; + } + if (filters.q && filters.q.trim() !== "") { + conditions.push( + "(title LIKE @q OR IFNULL(description, '') LIKE @q)" + ); + params.q = `%${filters.q.trim()}%`; + } + + const where = + conditions.length > 0 ? `WHERE ${conditions.join(" AND ")}` : ""; + const limit = Math.min(Math.max(filters.limit ?? 50, 1), 200); + const offset = Math.max(filters.offset ?? 0, 0); + + const sql = ` + SELECT id, title, description, status, created_at, updated_at + FROM resources + ${where} + ORDER BY id DESC + LIMIT ${limit} OFFSET ${offset} + `; + const stmt = this.db.prepare(sql); + return stmt.all(params) as ResourceRow[]; + } + + update(id: number, input: UpdateResourceInput): ResourceRow | undefined { + const existing = this.findById(id); + if (!existing) return undefined; + + const title = input.title ?? existing.title; + const description = + input.description !== undefined ? input.description : existing.description; + const status = input.status ?? existing.status; + + const stmt = this.db.prepare(` + UPDATE resources + SET title = @title, + description = @description, + status = @status, + updated_at = datetime('now') + WHERE id = @id + RETURNING id, title, description, status, created_at, updated_at + `); + return stmt.get({ + id, + title, + description, + status, + }) as ResourceRow | undefined; + } + + delete(id: number): boolean { + const stmt = this.db.prepare(`DELETE FROM resources WHERE id = ?`); + const result = stmt.run(id); + return result.changes > 0; + } +} diff --git a/src/problem5/src/routes/resources.ts b/src/problem5/src/routes/resources.ts new file mode 100644 index 0000000000..56bd88b2b3 --- /dev/null +++ b/src/problem5/src/routes/resources.ts @@ -0,0 +1,49 @@ +/** + * HTTP handlers for `/api/resources`. + * Mounted in `app.ts` at that path. Register `GET /` before `GET /:id` so the + * list route is not treated as an id (e.g. "list" would otherwise match :id). + */ +import { Router } from "express"; +import { + createResource, + deleteResource, + getResourceById, + listResources, + updateResource, +} from "../functions/resources.js"; +import type { ResourceRepository } from "../repository.js"; + +export function createResourcesRouter(repo: ResourceRepository): Router { + const router = Router(); + + // GET /api/resources — list with optional filters: status, q, limit, offset + router.get("/", (req, res) => listResources(repo, req, res)); + + // GET /api/resources/:id — single resource or 404 + router.get("/:id", (req, res) => getResourceById(repo, req, res)); + + // POST /api/resources — create (201) + /** + * body: { + * title: string; + * description: string | null; + * status: "draft" | "active" | "archived"; + * } + */ + router.post("/", (req, res) => createResource(repo, req, res)); + + // PUT /api/resources/:id — partial update; at least one field required + /** + * body: { + * title: string; + * description: string | null; + * status: "draft" | "active" | "archived"; + * } + */ + router.put("/:id", (req, res) => updateResource(repo, req, res)); + + // DELETE /api/resources/:id — 204 on success + router.delete("/:id", (req, res) => deleteResource(repo, req, res)); + + return router; +} diff --git a/src/problem5/src/types.ts b/src/problem5/src/types.ts new file mode 100644 index 0000000000..9772d23fed --- /dev/null +++ b/src/problem5/src/types.ts @@ -0,0 +1,38 @@ +export type ResourceStatus = "draft" | "active" | "archived"; + +export interface ResourceRow { + id: number; + title: string; + description: string | null; + status: ResourceStatus; + created_at: string; + updated_at: string; +} + +export interface Resource { + id: number; + title: string; + description: string | null; + status: ResourceStatus; + createdAt: string; + updatedAt: string; +} + +export interface CreateResourceInput { + title: string; + description?: string | null; + status?: ResourceStatus; +} + +export interface UpdateResourceInput { + title?: string; + description?: string | null; + status?: ResourceStatus; +} + +export interface ListResourcesQuery { + status?: ResourceStatus; + q?: string; + limit?: number; + offset?: number; +} diff --git a/src/problem5/tsconfig.json b/src/problem5/tsconfig.json new file mode 100644 index 0000000000..960ac809a7 --- /dev/null +++ b/src/problem5/tsconfig.json @@ -0,0 +1,15 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "resolveJsonModule": true + }, + "include": ["src/**/*"] +} diff --git a/src/problem6/IMPROVEMENTS.md b/src/problem6/IMPROVEMENTS.md new file mode 100644 index 0000000000..397112c273 --- /dev/null +++ b/src/problem6/IMPROVEMENTS.md @@ -0,0 +1,43 @@ +# Live Leaderboard API — Implementation improvements & notes + +This file collects **additional comments for improvement**: optional enhancements, trade-offs, and testing guidance. It is **not** part of the normative software requirements. For requirements, flows, and diagrams, see [README.md](./README.md). + +Nothing here replaces the hard security requirements in [README §6 — Security and authorisation](./README.md#6-security-and-authorisation). + +--- + +## Security and integrity + +- Prefer **deriving `user_id` from the auth token** instead of trusting request body fields. +- If the action is validated elsewhere, treat this API as a **reward sink**: only accept **signed, short-lived, one-use** proofs of completion. +- Add **audit logging** (who gained points, when, source IP, correlation id) for dispute handling and fraud investigation. + +## Performance and scale + +- Use a **sorted set** (e.g. Redis) for O(log N) rank updates if write volume is high; snapshot top 10 to a durable store periodically if needed. +- **Debounce** or **coalesce** live broadcasts if many updates arrive in the same second to reduce client churn. + +## Live transport + +- **SSE** is simpler for read-only push; **WebSocket** if bidirectional ping/pong or future features are needed. +- Consider **segmented channels** (e.g. per tournament or namespace) if the product grows beyond a single global board. + +## API design + +- Expose **ETag** or `Last-Modified` on **GET /leaderboard** for HTTP caching where appropriate. +- Document **versioning** (`/v1/...`) early to avoid breaking mobile or third-party clients later. + +## Fairness and abuse + +- Server-side **ceilings** on points per action type once action types are modelled. +- Optional **manual moderation** hooks (freeze user, rollback score) for support and operations. + +## Testing guidance + +- Contract tests for **auth failure**, **cross-user tampering**, **replay**, and **idempotent retry**. +- Load tests on **live fan-out** (many viewers, frequent updates). + +## Operational extras (optional) + +- **Alerting** on spikes in `401`/`403` or score-update rate (possible abuse or misconfiguration). +- **Feature flags** to disable increments or switch to read-only mode during incidents. diff --git a/src/problem6/README.md b/src/problem6/README.md new file mode 100644 index 0000000000..fc7995e5d1 --- /dev/null +++ b/src/problem6/README.md @@ -0,0 +1,207 @@ +# Live Leaderboard API — Module Specification + +This document specifies a backend module for an **API service** that maintains a **top-10 scoreboard**, accepts **authenticated score updates** after user actions, and delivers **live leaderboard updates** to connected clients. It is intended for handoff to a backend engineering team for implementation; technology choices below are **recommendations**, not mandates, unless marked as a hard requirement. + +## 1. Goals and scope + +### In scope + +- Persist and expose the **top 10** users by score (ties broken by a deterministic rule—see [§4](#4-data-model)). +- Provide an HTTP API to **increment a user’s score** only when the caller is **authorised** to do so for that user. +- Support **live refresh** of the scoreboard for viewers (sub-second to low-second latency is desirable). +- **Prevent unauthorised score inflation** (malicious clients cannot arbitrarily increase scores). + +### Out of scope (explicit) + +- Definition or validation of the **user action** itself (game logic, task completion, anti-cheat on the client). +- User registration, profile management, or full identity lifecycle (assumed to exist or to be stubbed per environment). + +--- + +## 2. Actors + +| Actor | Role | +| ------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- | +| **End user (browser/app)** | Completes an action; the client then calls this API with credentials. | +| **Scoreboard viewer** | Reads the leaderboard; may be the same user or anonymous. | +| **API service (this module)** | Authenticates score updates, updates persisted scores, publishes leaderboard changes. | +| **Optional: Action / reward service** | May issue a **short-lived, signed “completion token”** proving an action was allowed (recommended pattern—see [§6](#6-security-and-authorisation)). | + +--- + +## 3. Functional requirements + +### 3.1 Leaderboard (read) + +- The system must return the **current top 10** entries, each including at minimum: + - **Rank** (1–10) + - **User identifier** (opaque ID or public display handle—product decision) + - **Score** (non-negative integer unless product specifies decimals) +- Ordering: **descending by score**; for ties, use a **stable rule** (e.g. earlier “first to reach that score” wins, or lexicographic user id—must be documented in implementation). + +### 3.2 Score update (write) + +- When a user **completes an action**, the client performs an **API call** to record the score increase. +- The server must **attribute the increase to exactly one user** and apply a **bounded increment** (see [§6](#6-security-and-authorisation)). +- The operation must be **idempotent** when a client retries the same logical completion (e.g. same idempotency key or signed token used once). + +### 3.3 Live updates + +- Viewers of the scoreboard must receive **updates without manual full-page refresh** when the top 10 **may have changed** (after any successful score update that affects the leaderboard, or on connect). +- Acceptable transports include **WebSocket**, **Server-Sent Events (SSE)**, or **long polling**; WebSocket or SSE are preferred for efficiency. + +--- + +## 4. Data model + +Minimal conceptual model (exact schema is an implementation detail): +| Entity / field | Description | +| -------------- | ----------- | +| **User score** | `user_id` (unique), `score` (integer ≥ 0), `updated_at` | +| **Leaderboard cache (optional)** | Materialised top 10 or Redis sorted set for fast read + broadcast | +**Recommendation:** maintain authoritative totals in a durable store; use a cache or periodic query for “top 10” if scale requires it. + +--- + +## 5. API surface (normative behaviour) + +Exact paths and JSON field names can be adjusted to fit existing API conventions; **behaviour** must match. + +### 5.1 Get leaderboard (HTTP) + +- **Method:** `GET` +- **Auth:** **Public** or **optional auth** (product decision). Anonymous viewers must not see anything that violates privacy policy (e.g. internal user ids). +- **Response:** `200` with body containing an ordered list of up to **10** entries (see [§3.1](#31-leaderboard-read)). + +### 5.2 Increment score (HTTP) + +- **Method:** `POST` (or `PATCH` if aligned with existing APIs) +- **Auth:** **Required** — caller must prove identity and right to increase **that** user’s score. +- **Request body (conceptual):** + - `user_id` — target user (may be inferred from token instead of body to prevent tampering) + - `points` — increment amount; **must be validated** (positive integer, **upper cap per request**) + - Optional: `idempotency_key` or **one-time completion token** (see [§6](#6-security-and-authorisation)) +- **Responses:** + - `200` / `204` — applied; response may include new total and whether leaderboard changed + - `401` — missing/invalid authentication + - `403` — authenticated but not allowed to update this score + - `409` — duplicate idempotency / token replay + - `422` — invalid payload (e.g. points out of range) + - `429` — rate limited + +### 5.3 Live channel + +- **Protocol:** WebSocket or SSE (or documented fallback). +- **Auth for subscribers:** **Public read** is acceptable for a public leaderboard; restrict if scores are sensitive. +- **Events:** At minimum, a **“leaderboard_updated”** (or equivalent) event carrying the **current top 10** snapshot after a relevant write, plus an initial snapshot on subscribe. + +--- + +## 6. Security and authorisation + +**Hard requirement:** score increases must not be possible for arbitrary unauthenticated clients. + +### 6.1 Recommended patterns (choose one or combine) + +1. **Session or JWT bound to user** + The client sends a **Bearer token** (or session cookie). The server **ignores `user_id` in the body** and derives the subject from the token, then increments **only that user’s** score. Prevents “change body to another user’s id” attacks. +2. **Signed completion token (service-to-service or client-presented)** + The component that **knows** the action completed issues a **short-lived signed JWT** (or HMAC token) including `user_id`, `points` (or allowed range), `exp`, and `jti` (nonce). The leaderboard API **verifies signature** with a shared secret or public key, enforces **one-time use** of `jti`, and applies the increment. Prevents fake completions even if the user tampers with the client. +3. **Rate limiting and caps** + Per IP, per user, and global limits; **maximum points per request** and **maximum increments per time window**. +4. **Idempotency** + Support `Idempotency-Key` header or intrinsic token `jti` so retries do not double-award. + +### 6.2 Threats to mitigate + +| Threat | Mitigation | +| ------------------------------------------- | ---------------------------------------------------------------------- | +| Forged requests increasing any user’s score | AuthN + bind update to token subject or verify signed completion token | +| Replay of the same completion many times | One-time tokens / idempotency store | +| Brute-force high scores | Rate limits + server-side max points per event | +| Scraping or DoS on live endpoint | Connection limits, optional auth, CDN/WAF in front | + +--- + +## 7. Execution flow (diagrams) + +### 7.1 Score update and broadcast (happy path) + +```mermaid +sequenceDiagram + participant U as User client + participant API as Leaderboard API + participant Auth as Auth verifier + participant DB as Persistent store + participant Pub as Pub/sub or channel manager + participant W as WebSocket / SSE clients + U->>API: POST increment score (credentials + payload) + API->>Auth: Validate token / signature + Auth-->>API: Subject + claims OK + API->>API: Validate points, idempotency, rate limits + API->>DB: Apply increment (transaction) + DB-->>API: New totals / affected rows + API->>API: Recompute or refresh top 10 if needed + API->>Pub: Publish leaderboard_updated + Pub->>W: Push snapshot to subscribers + API-->>U: 200 OK (optional body with new rank/score) +``` + +### 7.2 Viewer connects for live leaderboard + +```mermaid +sequenceDiagram + participant V as Viewer client + participant API as Leaderboard API + participant Live as Live transport layer + participant DB as Persistent store + V->>API: Open WebSocket / subscribe SSE + API->>Live: Register connection + API->>DB: Load current top 10 + DB-->>API: Rows + API->>V: Initial leaderboard snapshot + API->>V: leaderboard_updated (new top 10) +``` + +### 7.3 Component view (logical) + +```mermaid +flowchart LR + subgraph Clients + A[Action client] + B[Scoreboard viewer] + end + subgraph Leaderboard module + R[HTTP REST] + L[Live gateway] + S[Score service] + C[Leaderboard query] + end + D[(Primary storage)] + P[[Optional cache / pub-sub]] + A --> R + B --> R + B --> L + R --> S + S --> D + S --> P + C --> D + C --> P + L --> P +``` + +--- + +## 8. Non-functional requirements + +- **Consistency:** After a successful write, subsequent **GET** and **live** payloads must reflect the update within the **same server** or cluster consistency guarantees (eventual consistency across regions is acceptable if documented). +- **Availability:** Live connections should degrade gracefully (client reconnect with backoff). +- **Observability:** Metrics for update rate, auth failures, broadcast lag; structured logs without leaking secrets. + +--- + +## 9. Open decisions for product / platform + +- Public vs authenticated **read** of the leaderboard. +- Display **nickname** vs opaque id; GDPR / COPPA if applicable. +- Whether **anonymous** users have scores (usually no—require login).