feat: add thingiverse support

src/lib/fetcha.ts

@@ -1,4 +1,5 @@
 import printablesComFetcha from './fetcha/printables.com';
+import thingiverseComFetcha from './fetcha/thingiverse.com';
 
 export type FetchaFile = {
   name: string;
@@ -15,6 +16,9 @@ export default async function fetcha(url: string): Promise<FetchaFile[]> {
     case 'printables.com':
     case 'www.printables.com':
       return await printablesComFetcha(url, '.scad');
+    case 'thingiverse.com':
+    case 'www.thingiverse.com':
+      return await thingiverseComFetcha(url, '.scad');
     default: {
       const urlParts = url.split('/');
 

src/lib/fetcha/thingiverse.com.ts

@@ -0,0 +1,54 @@
+import { FetchaFile } from '../fetcha';
+
+type Stl = {
+  id: number;
+  name: string;
+  fileSize: number;
+  // filePreviewPath: string; // Always empty in my tests
+};
+
+export default async function thingiverseComFetcha(
+  url: string,
+  fileNameFilter?: string
+): Promise<FetchaFile[]> {
+  // Url is expected to look like `https://www.thingiverse.com/thing:2523187`.
+  // We need to extract the id from the url, which is `2523187` in this case.
+  const idString = url.match(/\/thing:(\d+)/)?.[1];
+
+  // Download the current app bundle which contains a bearer token.
+  const appBundleResponse = await fetch(
+    'https://cdn.thingiverse.com/site/js/app.bundle.js'
+  );
+  const appBundle = await appBundleResponse.text();
+
+  // The app bundle contains minified code, and at the time of writing this comment, the token
+  // is located in a `u="<token>"` string. The closest identifiable string before that definition
+  // is `https://tv-zip.thingiverse.com`. So we could search for that string and then search fowards
+  // for the token. *But* also at the time of writing, it was the only 32char long a-z0-9 string in
+  // the entire app bundle. So we can just search for that.
+
+  /* const tokenStart = appBundle.indexOf('https://tv-zip.thingiverse.com');
+  const searchPart = appBundle.substring(tokenStart);
+  const token = searchPart.match(/u="([a-f0-9]{32})"/)?.[1];*/
+
+  const token = appBundle.match(/="([a-f0-9]{32})"/)?.[1];
+
+  // With the token we can now get the list of files
+  const thingResponse = await fetch(
+    `https://api.thingiverse.com/things/${idString}`,
+    {
+      headers: {
+        Authorization: `Bearer ${token}`,
+      },
+    }
+  );
+  const thing = await thingResponse.json();
+
+  return thing.zip_data.files
+    .filter((file) => file.name.match(fileNameFilter || ''))
+    .map((file) => ({
+      description: '',
+      name: file.name,
+      url: file.url,
+    }));
+}