feat: scaffold workspace with search, fetch, and extract packages

2026-08-08 10:43:00 +08:00
parent 405602a943
commit 1de559c321
30 changed files with 1381 additions and 0 deletions
@@ -0,0 +1,6 @@
+# Steam Web API key (required for fetching item details / file_url).
+# Get one at https://steamcommunity.com/dev/apikey
+STEAM_API_KEY=
+
+# Port for the proxy server.
+PORT=3000
@@ -0,0 +1,5 @@
+node_modules/
+dist/
+*.log
+.env
+.env.local
@@ -0,0 +1,61 @@
+# TTS Workshop
+
+Search the Tabletop Simulator Steam Workshop, fetch full TTS save files, and
+analyze their contents. A lightweight, client-only pnpm monorepo.
+
+## Packages
+
+| Package             | Role                                                   | Runtime    |
+| ------------------- | ------------------------------------------------------ | ---------- |
+| `apps/proxy`        | Hono HTTP server: Workshop search + save fetch         | Node       |
+| `packages/tts`      | Fetch save from Steam, BSON-parse to `TTSMod`          | Node       |
+| `packages/extract`  | Analyze a `TTSMod`: objects, asset refs, downloads     | Isomorphic |
+| `packages/shared`   | Shared types + zod schemas                             | Isomorphic |
+
+See [`docs/architecture.md`](docs/architecture.md) for the architecture and
+[`docs/implementation-plan.md`](docs/implementation-plan.md) for the plan.
+
+## Setup
+
+```sh
+pnpm install
+cp .env.example .env   # then set STEAM_API_KEY
+pnpm dev               # runs the proxy at http://localhost:3000
+```
+
+Get a Steam Web API key at https://steamcommunity.com/dev/apikey (free).
+
+## API
+
+| Method | Path              | Description                                  |
+| ------ | ----------------- | -------------------------------------------- |
+| GET    | `/health`         | Liveness                                     |
+| GET    | `/search?q=&page=`| Search the Workshop (scrapes browse page)    |
+| GET    | `/items/:id`      | Full parsed `TTSMod` (BSON save)             |
+| GET    | `/items/:id/file` | Raw save bytes, filename from header         |
+
+## Commands
+
+```sh
+pnpm dev          # run the proxy (tsx watch)
+pnpm build        # compile all packages
+pnpm typecheck    # typecheck all packages
+pnpm lint         # lint all packages
+```
+
+## How search works
+
+Steam has no official search API. The proxy fetches the Workshop browse page
+(`steamcommunity.com/workshop/browse/?appid=286160`) and parses the embedded
+`window.SSR.renderContext` JSON (a React Query cache containing a
+`workshop_browse` entry with the results). This is more robust than scraping
+the DOM, but Steam can still change the page structure — if search breaks, that
+parser is the first place to look.
+
+## Notes
+
+- `STEAM_API_KEY` is only needed for `/items/*` (resolving `file_url`). Search
+  works without it.
+- Each request fetches fresh; there is no caching by design (client-only tool).
+- `packages/extract` has zero runtime dependencies and runs in browser or Node,
+  ready for a future frontend.
@@ -0,0 +1,26 @@
+{
+  "name": "@tts/proxy",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.js",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc -p tsconfig.json",
+    "start": "node dist/index.js",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "lint": "echo \"no lint configured\""
+  },
+  "dependencies": {
+    "@hono/node-server": "^1.13.7",
+    "@tts/shared": "workspace:*",
+    "@tts/tts": "workspace:*",
+    "hono": "^4.6.14",
+    "zod": "^3.24.1"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.2",
+    "tsx": "^4.19.2",
+    "typescript": "^5.7.2"
+  }
+}
@@ -0,0 +1,25 @@
+import { z } from 'zod';
+
+const envSchema = z.object({
+  STEAM_API_KEY: z.string().min(1, 'STEAM_API_KEY is required'),
+  PORT: z.coerce.number().int().min(1).max(65535).default(3000),
+});
+
+export type Env = z.infer<typeof envSchema>;
+
+/** Hono bindings type so `c.env` is typed in route handlers. */
+export interface Bindings {
+  STEAM_API_KEY: string;
+  PORT: number;
+}
+
+export function loadEnv(source: NodeJS.ProcessEnv = process.env): Env {
+  const parsed = envSchema.safeParse(source);
+  if (!parsed.success) {
+    const issues = parsed.error.issues
+      .map((i) => `${i.path.join('.')}: ${i.message}`)
+      .join('; ');
+    throw new Error(`Invalid environment: ${issues}`);
+  }
+  return parsed.data;
+}
@@ -0,0 +1,27 @@
+import { serve } from '@hono/node-server';
+import { cors } from 'hono/cors';
+import { Hono } from 'hono';
+import { loadEnv, type Bindings } from './env.js';
+import health from './routes/health.js';
+import items from './routes/items.js';
+import search from './routes/search.js';
+
+const env = loadEnv();
+
+const app = new Hono<{ Bindings: Bindings }>();
+
+app.use('*', cors());
+app.route('/health', health);
+app.route('/search', search);
+app.route('/items', items);
+
+serve(
+  {
+    fetch: app.fetch,
+    port: env.PORT,
+    overrideGlobalObjects: true,
+  },
+  (info) => {
+    console.log(`TTS proxy listening on http://localhost:${info.port}`);
+  },
+);
@@ -0,0 +1,7 @@
+import { Hono } from 'hono';
+
+const app = new Hono();
+
+app.get('/', (c) => c.json({ status: 'ok' }));
+
+export default app;
@@ -0,0 +1,57 @@
+import { Hono } from 'hono';
+import { itemIdSchema, type TTSMod } from '@tts/shared';
+import { fetchMod, fetchModFile, TtsError } from '@tts/tts';
+import type { Bindings } from '../env.js';
+
+const app = new Hono<{ Bindings: Bindings }>();
+
+app.get('/:id', async (c) => {
+  const id = c.req.param('id');
+  if (!itemIdSchema.safeParse(id).success) {
+    return c.json({ error: 'Item ID must be a number' }, 400);
+  }
+
+  const apiKey = c.env.STEAM_API_KEY;
+  if (!apiKey) {
+    return c.json({ error: 'STEAM_API_KEY is not configured' }, 500);
+  }
+
+  try {
+    const mod = await fetchMod(id, apiKey);
+    return c.json<TTSMod>(mod);
+  } catch (err) {
+    if (err instanceof TtsError) {
+      return c.json({ error: err.message }, err.status as 400 | 404 | 500 | 502);
+    }
+    return c.json({ error: String(err) }, 500);
+  }
+});
+
+app.get('/:id/file', async (c) => {
+  const id = c.req.param('id');
+  if (!itemIdSchema.safeParse(id).success) {
+    return c.json({ error: 'Item ID must be a number' }, 400);
+  }
+
+  const apiKey = c.env.STEAM_API_KEY;
+  if (!apiKey) {
+    return c.json({ error: 'STEAM_API_KEY is not configured' }, 500);
+  }
+
+  try {
+    const { data, filename } = await fetchModFile(id, apiKey);
+    return new Response(data, {
+      headers: {
+        'Content-Type': 'application/octet-stream',
+        'Content-Disposition': `attachment; filename="${filename}"`,
+      },
+    });
+  } catch (err) {
+    if (err instanceof TtsError) {
+      return c.json({ error: err.message }, err.status as 400 | 404 | 500 | 502);
+    }
+    return c.json({ error: String(err) }, 500);
+  }
+});
+
+export default app;
@@ -0,0 +1,106 @@
+import { Hono } from 'hono';
+import { searchQuerySchema, type SearchResult } from '@tts/shared';
+
+const BROWSE_URL = 'https://steamcommunity.com/workshop/browse/';
+const TTS_APP_ID = '286160';
+
+const app = new Hono();
+
+interface BrowseResult {
+  publishedfileid: string;
+  title: string;
+  preview_url: string;
+  file_url?: string;
+  tags?: { tag: string }[];
+  time_created?: number;
+  time_updated?: number;
+}
+
+interface BrowseData {
+  current_page: number;
+  total_pages: number;
+  total_count: number;
+  results: BrowseResult[];
+  next_cursor: string;
+}
+
+/**
+ * Steam embeds the Workshop browse results as a JSON blob inside
+ * `window.SSR.renderContext`. The renderContext is a JS-escaped JSON string
+ * whose `queryData` field is itself a JSON string containing React Query
+ * cache entries. We locate the `workshop_browse` query and read its results.
+ */
+function parseBrowseResults(html: string): BrowseData | null {
+  const scriptMatch = /<script[^>]*>([\s\S]*?)<\/script>/g;
+  const ASSIGNMENT = 'window.SSR.renderContext=JSON.parse(';
+  let m: RegExpExecArray | null;
+  while ((m = scriptMatch.exec(html))) {
+    const script = m[1] ?? '';
+    const start = script.indexOf(ASSIGNMENT);
+    if (start === -1) continue;
+
+    const openQuote = start + ASSIGNMENT.length + 1;
+    const lastTerm = script.lastIndexOf('");');
+    if (lastTerm === -1 || lastTerm <= openQuote) continue;
+
+    const raw = script.slice(openQuote, lastTerm);
+    const jsonText = JSON.parse('"' + raw + '"');
+    const renderContext = JSON.parse(jsonText);
+    const queryData = JSON.parse(renderContext.queryData);
+    const browse = queryData.queries.find((q: { queryKey: unknown[] }) =>
+      JSON.stringify(q.queryKey).includes('workshop_browse'),
+    );
+    if (browse?.state?.data?.results) {
+      return browse.state.data as BrowseData;
+    }
+  }
+  return null;
+}
+
+app.get('/', async (c) => {
+  const parsed = searchQuerySchema.safeParse(c.req.query());
+  if (!parsed.success) {
+    return c.json({ error: parsed.error.issues[0]?.message }, 400);
+  }
+  const { q, page } = parsed.data;
+
+  const url = new URL(BROWSE_URL);
+  url.searchParams.set('appid', TTS_APP_ID);
+  url.searchParams.set('searchtext', q);
+  url.searchParams.set('pagenum', String(page));
+
+  let html: string;
+  try {
+    const res = await fetch(url);
+    if (!res.ok) {
+      return c.json({ error: `Steam browse page responded ${res.status}` }, 502);
+    }
+    html = await res.text();
+  } catch (err) {
+    return c.json({ error: `Failed to fetch browse page: ${String(err)}` }, 502);
+  }
+
+  const data = parseBrowseResults(html);
+  if (!data) {
+    return c.json({ error: 'Could not parse Workshop browse results' }, 502);
+  }
+
+  const items: SearchResult['items'] = data.results.map((r) => ({
+    id: r.publishedfileid,
+    title: r.title,
+    author: '',
+    previewImageUrl: r.preview_url,
+    fileUrl: r.file_url,
+    tags: r.tags?.map((t) => t.tag),
+    timeCreated: r.time_created,
+    timeUpdated: r.time_updated,
+  }));
+
+  return c.json<SearchResult>({
+    items,
+    page: data.current_page,
+    hasMore: data.current_page < data.total_pages,
+  });
+});
+
+export default app;
@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "lib": ["ES2022", "DOM"],
+    "types": ["node"]
+  },
+  "include": ["src"]
+}
@@ -0,0 +1,16 @@
+{
+  "name": "tts-workshop",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "pnpm --filter @tts/proxy dev",
+    "build": "pnpm -r build",
+    "lint": "pnpm -r lint",
+    "typecheck": "pnpm -r typecheck"
+  },
+  "packageManager": "pnpm@10.33.0",
+  "devDependencies": {
+    "typescript": "^5.7.2"
+  }
+}
@@ -0,0 +1,25 @@
+{
+  "name": "@tts/extract",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "lint": "echo \"no lint configured\""
+  },
+  "dependencies": {
+    "@tts/shared": "workspace:*"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.2"
+  }
+}
@@ -0,0 +1,81 @@
+import type { AssetRef } from '@tts/shared';
+
+/** Guess a MIME type from a URL's file extension. */
+export function guessMimeType(url: string): string {
+  const ext = url.split('?')[0]!.split('.').pop()!.toLowerCase();
+  switch (ext) {
+    case 'png':
+      return 'image/png';
+    case 'jpg':
+    case 'jpeg':
+      return 'image/jpeg';
+    case 'gif':
+      return 'image/gif';
+    case 'webp':
+      return 'image/webp';
+    case 'pdf':
+      return 'application/pdf';
+    default:
+      return 'application/octet-stream';
+  }
+}
+
+/** Download a single asset as a `Blob`. */
+export async function downloadAsset(url: string): Promise<Blob> {
+  const res = await fetch(url);
+  if (!res.ok) {
+    throw new Error(`Failed to download asset (${res.status}): ${url}`);
+  }
+  return res.blob();
+}
+
+export interface DownloadProgress {
+  done: number;
+  total: number;
+  url: string;
+}
+
+export interface DownloadOptions {
+  concurrency?: number;
+  onProgress?: (p: DownloadProgress) => void;
+}
+
+export interface DownloadedAsset {
+  ref: AssetRef;
+  blob: Blob;
+}
+
+/**
+ * Download multiple assets with limited concurrency and a progress callback.
+ */
+export async function downloadAll(
+  refs: AssetRef[],
+  options: DownloadOptions = {},
+): Promise<DownloadedAsset[]> {
+  const concurrency = options.concurrency ?? 4;
+  const results: DownloadedAsset[] = [];
+  let done = 0;
+
+  const worker = async (ref: AssetRef): Promise<void> => {
+    const blob = await downloadAsset(ref.url);
+    results.push({ ref, blob });
+    done += 1;
+    options.onProgress?.({ done, total: refs.length, url: ref.url });
+  };
+
+  const queue = [...refs];
+  const workers: Promise<void>[] = [];
+  for (let i = 0; i < Math.min(concurrency, queue.length); i++) {
+    workers.push(
+      (async () => {
+        while (queue.length > 0) {
+          const ref = queue.shift()!;
+          await worker(ref);
+        }
+      })(),
+    );
+  }
+
+  await Promise.all(workers);
+  return results;
+}
@@ -0,0 +1,4 @@
+export * from './traverse.js';
+export * from './objects.js';
+export * from './refs.js';
+export * from './download.js';
@@ -0,0 +1,32 @@
+import type { TTSMod, TTSObject } from '@tts/shared';
+import { markParent, traverseMod } from './traverse.js';
+
+/**
+ * Flatten all objects in a save into an array.
+ * Ensures parent links are set before returning.
+ */
+export function flattenObjects(mod: TTSMod): TTSObject[] {
+  for (const state of mod.ObjectStates) {
+    markParent(state);
+  }
+  return [...traverseMod(mod)];
+}
+
+/**
+ * Filter objects by a predicate (name, GUID, type, etc.).
+ */
+export function filterObjects(
+  mod: TTSMod,
+  predicate: (o: TTSObject) => boolean,
+): TTSObject[] {
+  return flattenObjects(mod).filter(predicate);
+}
+
+/**
+ * Find a single object by GUID.
+ */
+export function findObject(mod: TTSMod, guid: string): TTSObject | undefined {
+  return flattenObjects(mod).find((o) => o.GUID === guid);
+}
+
+export { markParent, traverseMod } from './traverse.js';
@@ -0,0 +1,60 @@
+import type { AssetRef, TTSMod, TTSObject } from '@tts/shared';
+import { markParent, traverseMod } from './traverse.js';
+
+/**
+ * Extract every external asset reference from a single object.
+ */
+export function extractRefs(o: TTSObject): AssetRef[] {
+  const refs: AssetRef[] = [];
+  const ownerGuid = o.GUID;
+
+  if (o.CustomPDF?.PDFUrl) {
+    refs.push({ kind: 'pdf', url: o.CustomPDF.PDFUrl, ownerGuid });
+  }
+
+  if (o.CustomDeck) {
+    for (const deck of Object.values(o.CustomDeck)) {
+      if (deck.FaceURL) {
+        refs.push({ kind: 'deckFace', url: deck.FaceURL, ownerGuid });
+      }
+      if (deck.BackURL) {
+        refs.push({ kind: 'deckBack', url: deck.BackURL, ownerGuid });
+      }
+    }
+  }
+
+  if (o.CustomImage?.ImageURL) {
+    refs.push({ kind: 'image', url: o.CustomImage.ImageURL, ownerGuid });
+  }
+  if (o.CustomImage?.ImageSecondaryURL) {
+    refs.push({
+      kind: 'imageSecondary',
+      url: o.CustomImage.ImageSecondaryURL,
+      ownerGuid,
+    });
+  }
+
+  return refs;
+}
+
+/**
+ * Collect all asset references across a whole save, deduped by URL.
+ */
+export function collectRefs(mod: TTSMod): AssetRef[] {
+  for (const state of mod.ObjectStates) {
+    markParent(state);
+  }
+  const seen = new Set<string>();
+  const refs: AssetRef[] = [];
+  for (const o of traverseMod(mod)) {
+    for (const ref of extractRefs(o)) {
+      if (!seen.has(ref.url)) {
+        seen.add(ref.url);
+        refs.push(ref);
+      }
+    }
+  }
+  return refs;
+}
+
+export { markParent, traverseMod } from './traverse.js';
@@ -0,0 +1,34 @@
+import type { TTSMod, TTSObject } from '@tts/shared';
+
+/**
+ * Recursively set each object's `Parent` to its container.
+ * Mutates the tree in place.
+ */
+export function markParent(o: TTSObject): void {
+  if (o.ContainedObjects) {
+    for (const each of o.ContainedObjects) {
+      each.Parent = o;
+      markParent(each);
+    }
+  }
+}
+
+/**
+ * Yield every object in a save, descending into Bags and Custom_Model_Bags.
+ * Accepts either a full `TTSMod` or a single `TTSObject`.
+ */
+export function* traverseMod(
+  mod: TTSMod | TTSObject,
+): Iterable<TTSObject> {
+  if ('ObjectStates' in mod) {
+    for (const one of mod.ObjectStates) {
+      yield* traverseMod(one);
+    }
+  } else if (mod.Name === 'Bag' || mod.Name === 'Custom_Model_Bag') {
+    for (const one of mod.ContainedObjects ?? []) {
+      yield* traverseMod(one);
+    }
+  } else {
+    yield mod;
+  }
+}
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "lib": ["ES2022", "DOM"]
+  },
+  "include": ["src"]
+}
@@ -0,0 +1,25 @@
+{
+  "name": "@tts/shared",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "lint": "echo \"no lint configured\""
+  },
+  "dependencies": {
+    "zod": "^3.24.1"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.2"
+  }
+}
@@ -0,0 +1,2 @@
+export * from './types.js';
+export * from './schemas.js';
@@ -0,0 +1,54 @@
+import { z } from 'zod';
+
+/** Validate a Workshop item ID (a non-empty run of digits). */
+export const itemIdSchema = z
+  .string()
+  .regex(/^\d+$/, 'Item ID must be a number')
+  .min(1);
+
+/** Query params for `GET /search`. */
+export const searchQuerySchema = z.object({
+  q: z.string().trim().min(1, 'Search query is required'),
+  page: z.coerce.number().int().min(1).default(1),
+});
+
+export const assetKindSchema = z.enum([
+  'pdf',
+  'deckFace',
+  'deckBack',
+  'image',
+  'imageSecondary',
+]);
+
+export const assetRefSchema = z.object({
+  kind: assetKindSchema,
+  url: z.string().url(),
+  ownerGuid: z.string(),
+});
+
+export const extractedObjectSchema = z.object({
+  guid: z.string(),
+  name: z.string(),
+  type: z.string(),
+  parentGuid: z.string().optional(),
+  childrenGuids: z.array(z.string()),
+  refs: z.array(assetRefSchema),
+});
+
+export const workshopItemSchema = z.object({
+  id: z.string(),
+  title: z.string(),
+  author: z.string(),
+  previewImageUrl: z.string(),
+  fileUrl: z.string().optional(),
+  description: z.string().optional(),
+  tags: z.array(z.string()).optional(),
+  timeCreated: z.number().optional(),
+  timeUpdated: z.number().optional(),
+});
+
+export const searchResultSchema = z.object({
+  items: z.array(workshopItemSchema),
+  page: z.number(),
+  hasMore: z.boolean(),
+});
@@ -0,0 +1,84 @@
+/**
+ * A single object inside a Tabletop Simulator save file.
+ * Mirrors the structure produced by BSON-deserializing a TTS save.
+ */
+export interface TTSObject {
+  Name: string;
+  GUID: string;
+  Description: string;
+  /** Set by `markParent` during traversal; not present in the raw save. */
+  Parent?: TTSObject;
+
+  CustomPDF?: {
+    PDFUrl: string;
+  };
+
+  ContainedObjects?: TTSObject[];
+
+  CardID?: number;
+  CustomDeck?: {
+    [key: number]: {
+      BackURL: string;
+      FaceURL: string;
+      UniqueBack: boolean;
+      NumHeight: number;
+      NumWidth: number;
+    };
+  };
+  CustomImage?: {
+    ImageURL: string;
+    ImageSecondaryURL: string;
+  };
+}
+
+/** A full Tabletop Simulator save file. */
+export interface TTSMod {
+  GameMode: string;
+  Date: string;
+  ObjectStates: TTSObject[];
+}
+
+/** Metadata for a Workshop item, from the Steam Web API. */
+export interface WorkshopItem {
+  id: string;
+  title: string;
+  author: string;
+  previewImageUrl: string;
+  fileUrl?: string;
+  description?: string;
+  tags?: string[];
+  timeCreated?: number;
+  timeUpdated?: number;
+}
+
+/** A page of Workshop search results. */
+export interface SearchResult {
+  items: WorkshopItem[];
+  page: number;
+  hasMore: boolean;
+}
+
+/** A reference to an external asset embedded in a TTS object. */
+export type AssetKind =
+  | 'pdf'
+  | 'deckFace'
+  | 'deckBack'
+  | 'image'
+  | 'imageSecondary';
+
+export interface AssetRef {
+  kind: AssetKind;
+  url: string;
+  /** GUID of the object that owns this reference. */
+  ownerGuid: string;
+}
+
+/** A flattened, lightweight view of an object for inspection/rendering. */
+export interface ExtractedObject {
+  guid: string;
+  name: string;
+  type: string;
+  parentGuid?: string;
+  childrenGuids: string[];
+  refs: AssetRef[];
+}
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src"]
+}
@@ -0,0 +1,26 @@
+{
+  "name": "@tts/tts",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "lint": "echo \"no lint configured\""
+  },
+  "dependencies": {
+    "@tts/shared": "workspace:*",
+    "bson": "^6.10.1"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.2"
+  }
+}
@@ -0,0 +1,35 @@
+/** Errors thrown by the TTS fetcher. */
+
+export class TtsError extends Error {
+  constructor(
+    message: string,
+    readonly status: number = 500,
+  ) {
+    super(message);
+    this.name = 'TtsError';
+  }
+}
+
+/** The Steam API returned no details for the requested item. */
+export class ItemNotFoundError extends TtsError {
+  constructor(id: string) {
+    super(`No Workshop item found for id ${id}`, 404);
+    this.name = 'ItemNotFoundError';
+  }
+}
+
+/** The item exists but has no downloadable `file_url`. */
+export class NoFileError extends TtsError {
+  constructor(id: string) {
+    super(`Workshop item ${id} has no downloadable save file`, 404);
+    this.name = 'NoFileError';
+  }
+}
+
+/** The Steam API rejected the request (bad key, rate limit, etc.). */
+export class SteamApiError extends TtsError {
+  constructor(message: string, status = 502) {
+    super(message, status);
+    this.name = 'SteamApiError';
+  }
+}
@@ -0,0 +1,113 @@
+import { deserialize } from 'bson';
+import type { TTSMod } from '@tts/shared';
+import { ItemNotFoundError, NoFileError, SteamApiError } from './errors.js';
+
+const STEAM_API_URL =
+  'https://api.steampowered.com/ISteamRemoteStorage/GetPublishedFileDetails/v1/';
+
+interface SteamPublishedFileDetails {
+  publishedfileid: string;
+  title: string;
+  creator: string;
+  preview_url: string;
+  file_url?: string;
+  description?: string;
+  tags?: { tag: string }[];
+  time_created?: number;
+  time_updated?: number;
+}
+
+interface SteamResponse {
+  response: {
+    result: number;
+    resultcount: number;
+    publishedfiledetails?: SteamPublishedFileDetails[];
+  };
+}
+
+/**
+ * Fetch a full TTS save for a Workshop item and BSON-deserialize it.
+ *
+ * @param id Workshop item ID (digits only).
+ * @param apiKey Steam Web API key.
+ */
+export async function fetchMod(id: string, apiKey: string): Promise<TTSMod> {
+  const fileUrl = await getFileUrl(id, apiKey);
+
+  const saveRes = await fetch(fileUrl);
+  if (!saveRes.ok) {
+    throw new SteamApiError(
+      `Failed to download save file (${saveRes.status})`,
+      502,
+    );
+  }
+
+  const buffer = await saveRes.arrayBuffer();
+  return deserialize(new Uint8Array(buffer)) as TTSMod;
+}
+
+/**
+ * Derive a filename from a `content-disposition` header.
+ * Parses `filename="..."`; falls back to the URL path, then a default.
+ */
+export function getFileName(url: string, disposition: string | null): string {
+  if (disposition) {
+    const match = disposition.match(/filename\*?=(?:"([^"]*)"|([^;\s]*))/i);
+    const name = match?.[1] ?? match?.[2];
+    if (name) {
+      return name;
+    }
+  }
+  return new URL(url).pathname.split('/').pop() || 'save.json';
+}
+
+/**
+ * Fetch the raw save file bytes for a Workshop item.
+ * Returns the bytes plus a derived filename.
+ */
+export async function fetchModFile(
+  id: string,
+  apiKey: string,
+): Promise<{ data: ArrayBuffer; filename: string }> {
+  const fileUrl = await getFileUrl(id, apiKey);
+
+  const res = await fetch(fileUrl);
+  if (!res.ok) {
+    throw new SteamApiError(
+      `Failed to download save file (${res.status})`,
+      502,
+    );
+  }
+
+  const data = await res.arrayBuffer();
+  const filename = getFileName(fileUrl, res.headers.get('content-disposition'));
+  return { data, filename };
+}
+
+/** Resolve the `file_url` for a Workshop item via the Steam API. */
+async function getFileUrl(id: string, apiKey: string): Promise<string> {
+  const params = new URLSearchParams();
+  params.append('key', apiKey);
+  params.append('itemcount', '1');
+  params.append('publishedfileids[0]', id);
+
+  const res = await fetch(STEAM_API_URL, {
+    method: 'POST',
+    body: params,
+  });
+  if (!res.ok) {
+    throw new SteamApiError(`Steam API responded ${res.status}`, 502);
+  }
+
+  const json = (await res.json()) as SteamResponse;
+  const details = json.response.publishedfiledetails?.[0];
+  if (!details) {
+    throw new ItemNotFoundError(id);
+  }
+  if (!details.file_url) {
+    throw new NoFileError(id);
+  }
+  return details.file_url;
+}
+
+export * from './errors.js';
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "lib": ["ES2022", "DOM"]
+  },
+  "include": ["src"]
+}
@@ -0,0 +1,411 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    devDependencies:
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+
+  apps/proxy:
+    dependencies:
+      '@hono/node-server':
+        specifier: ^1.13.7
+        version: 1.19.17(hono@4.13.1)
+      '@tts/shared':
+        specifier: workspace:*
+        version: link:../../packages/shared
+      '@tts/tts':
+        specifier: workspace:*
+        version: link:../../packages/tts
+      hono:
+        specifier: ^4.6.14
+        version: 4.13.1
+      zod:
+        specifier: ^3.24.1
+        version: 3.25.76
+    devDependencies:
+      '@types/node':
+        specifier: ^22.10.2
+        version: 22.20.1
+      tsx:
+        specifier: ^4.19.2
+        version: 4.23.11
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+
+  packages/extract:
+    dependencies:
+      '@tts/shared':
+        specifier: workspace:*
+        version: link:../shared
+    devDependencies:
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+
+  packages/shared:
+    dependencies:
+      zod:
+        specifier: ^3.24.1
+        version: 3.25.76
+    devDependencies:
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+
+  packages/tts:
+    dependencies:
+      '@tts/shared':
+        specifier: workspace:*
+        version: link:../shared
+      bson:
+        specifier: ^6.10.1
+        version: 6.10.4
+    devDependencies:
+      typescript:
+        specifier: ^5.7.2
+        version: 5.9.3
+
+packages:
+
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+    engines: {node: '>=18'}
+    cpu: [x64]
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+
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+
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+
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+    cpu: [x64]
+    os: [netbsd]
+
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+    engines: {node: '>=18'}
+    cpu: [arm64]
+    os: [openbsd]
+
+  '@esbuild/openbsd-x64@0.28.1':
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+    engines: {node: '>=18'}
+    cpu: [x64]
+    os: [openbsd]
+
+  '@esbuild/openharmony-arm64@0.28.1':
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+    engines: {node: '>=18'}
+    cpu: [arm64]
+    os: [openharmony]
+
+  '@esbuild/sunos-x64@0.28.1':
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+    engines: {node: '>=18'}
+    cpu: [x64]
+    os: [sunos]
+
+  '@esbuild/win32-arm64@0.28.1':
+    resolution: {integrity: sha512-lCv9eK/H6ZJWbE7bh2nw54CZ9M2nupBxJcTsdk/QQnWkdSjKGuxmmH8/GWrlT1eMmZfn4dGcCjRte397WqfQXA==}
+    engines: {node: '>=18'}
+    cpu: [arm64]
+    os: [win32]
+
+  '@esbuild/win32-ia32@0.28.1':
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+    engines: {node: '>=18'}
+    cpu: [ia32]
+    os: [win32]
+
+  '@esbuild/win32-x64@0.28.1':
+    resolution: {integrity: sha512-bm4Mowrv+GXMlpWX++EcXw/iLyd1o3+bJkC2DkWXYVvgZCqD/bSj9ctZeAMC3cIxgjRVR2Dufaiu4YPxr5gW1A==}
+    engines: {node: '>=18'}
+    cpu: [x64]
+    os: [win32]
+
+  '@hono/node-server@1.19.17':
+    resolution: {integrity: sha512-dSneS5qhiauZWGDCeK4o695Xd9nUNjviSZCMQrj10eetr8Uln1ucn6bbphOM6UynAMMtNIzZNSpL9vnASJwrPQ==}
+    engines: {node: '>=18.14.1'}
+    peerDependencies:
+      hono: ^4
+
+  '@types/node@22.20.1':
+    resolution: {integrity: sha512-EANqOCF9QFyra+4pfxUcX9STKJpCLjMbObVzljIJomAWSnuSIEAvyzEU53GaajbXJEgdh0iEcPL+DGvpUd4k1Q==}
+
+  bson@6.10.4:
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+    engines: {node: '>=16.20.1'}
+
+  esbuild@0.28.1:
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+    engines: {node: '>=18'}
+    hasBin: true
+
+  fsevents@2.3.3:
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+    engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
+    os: [darwin]
+
+  hono@4.13.1:
+    resolution: {integrity: sha512-kdJoFVv2xmayw6cY09H7AbMJMt8Jn5jdlEdXsP7AGBdF2DIptVlKlOLKXP41yPip4/a3yQPv9gVcJYI8YY04dw==}
+    engines: {node: '>=16.9.0'}
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+
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+
+snapshots:
+
+  '@esbuild/aix-ppc64@0.28.1':
+    optional: true
+
+  '@esbuild/android-arm64@0.28.1':
+    optional: true
+
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+
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+    optional: true
+
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+    optional: true
+
+  '@esbuild/linux-s390x@0.28.1':
+    optional: true
+
+  '@esbuild/linux-x64@0.28.1':
+    optional: true
+
+  '@esbuild/netbsd-arm64@0.28.1':
+    optional: true
+
+  '@esbuild/netbsd-x64@0.28.1':
+    optional: true
+
+  '@esbuild/openbsd-arm64@0.28.1':
+    optional: true
+
+  '@esbuild/openbsd-x64@0.28.1':
+    optional: true
+
+  '@esbuild/openharmony-arm64@0.28.1':
+    optional: true
+
+  '@esbuild/sunos-x64@0.28.1':
+    optional: true
+
+  '@esbuild/win32-arm64@0.28.1':
+    optional: true
+
+  '@esbuild/win32-ia32@0.28.1':
+    optional: true
+
+  '@esbuild/win32-x64@0.28.1':
+    optional: true
+
+  '@hono/node-server@1.19.17(hono@4.13.1)':
+    dependencies:
+      hono: 4.13.1
+
+  '@types/node@22.20.1':
+    dependencies:
+      undici-types: 6.21.0
+
+  bson@6.10.4: {}
+
+  esbuild@0.28.1:
+    optionalDependencies:
+      '@esbuild/aix-ppc64': 0.28.1
+      '@esbuild/android-arm': 0.28.1
+      '@esbuild/android-arm64': 0.28.1
+      '@esbuild/android-x64': 0.28.1
+      '@esbuild/darwin-arm64': 0.28.1
+      '@esbuild/darwin-x64': 0.28.1
+      '@esbuild/freebsd-arm64': 0.28.1
+      '@esbuild/freebsd-x64': 0.28.1
+      '@esbuild/linux-arm': 0.28.1
+      '@esbuild/linux-arm64': 0.28.1
+      '@esbuild/linux-ia32': 0.28.1
+      '@esbuild/linux-loong64': 0.28.1
+      '@esbuild/linux-mips64el': 0.28.1
+      '@esbuild/linux-ppc64': 0.28.1
+      '@esbuild/linux-riscv64': 0.28.1
+      '@esbuild/linux-s390x': 0.28.1
+      '@esbuild/linux-x64': 0.28.1
+      '@esbuild/netbsd-arm64': 0.28.1
+      '@esbuild/netbsd-x64': 0.28.1
+      '@esbuild/openbsd-arm64': 0.28.1
+      '@esbuild/openbsd-x64': 0.28.1
+      '@esbuild/openharmony-arm64': 0.28.1
+      '@esbuild/sunos-x64': 0.28.1
+      '@esbuild/win32-arm64': 0.28.1
+      '@esbuild/win32-ia32': 0.28.1
+      '@esbuild/win32-x64': 0.28.1
+
+  fsevents@2.3.3:
+    optional: true
+
+  hono@4.13.1: {}
+
+  tsx@4.23.11:
+    dependencies:
+      esbuild: 0.28.1
+    optionalDependencies:
+      fsevents: 2.3.3
+
+  typescript@5.9.3: {}
+
+  undici-types@6.21.0: {}
+
+  zod@3.25.76: {}
@@ -0,0 +1,3 @@
+packages:
+  - 'apps/*'
+  - 'packages/*'
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022"],
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "declaration": true,
+    "sourceMap": true
+  }
+}