feat: add weekly curriculum cover image upload and display

tests/remote-module-files.cjs

@@ -0,0 +1,44 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+const vm = require('node:vm');
+const { spawnSync } = require('node:child_process');
+const ts = require('typescript');
+const source = fs.readFileSync(path.join(__dirname, '../src/main/remoteModuleFiles.ts'), 'utf8');
+const context = { exports: {}, Buffer };
+vm.runInNewContext(ts.transpileModule(source, { compilerOptions: { module: ts.ModuleKind.CommonJS } }).outputText, context);
+const script = context.exports.remoteModuleFilesScript;
+const root = fs.mkdtempSync(path.join(os.tmpdir(), 'module-files-'));
+function run(request) {
+  return spawnSync('bash', ['-s'], { input: script(root, request), encoding: 'utf8' });
+}
+function read(request) {
+  const result = run(request);
+  assert.equal(result.status, 0, result.stderr);
+  return JSON.parse(result.stdout);
+}
+try {
+  fs.mkdirSync(path.join(root, 'src'));
+  fs.mkdirSync(path.join(root, 'build'));
+  fs.writeFileSync(path.join(root, 'src', 'hello.py'), 'first\nHello world\n');
+  fs.writeFileSync(path.join(root, 'build', 'hidden.py'), 'Hello');
+  fs.writeFileSync(path.join(root, 'large.txt'), 'x'.repeat(1048577));
+  fs.writeFileSync(path.join(root, 'binary.txt'), Buffer.from([0, 1]));
+  fs.symlinkSync('/etc/passwd', path.join(root, 'outside.txt'));
+  const listing = read({ action: 'list' });
+  assert.deepEqual(listing, { filePaths: ['binary.txt', 'large.txt', 'src/hello.py'], folders: ['src'] });
+  assert.equal(read({ action: 'content', path: 'src/hello.py' }).content, 'first\nHello world\n');
+  for (const file of ['large.txt', 'binary.txt']) {
+    assert.equal(read({ action: 'content', path: file }).content, 'Binary or large file preview is not available.');
+  }
+  for (const file of ['../outside.txt', '/etc/passwd', 'outside.txt', 'missing.py']) {
+    assert.notEqual(run({ action: 'content', path: file }).status, 0);
+  }
+  assert.deepEqual(read({ action: 'search', query: 'HELLO' }), [{ file: 'src/hello.py', lineNumber: 2, lineText: 'Hello world' }]);
+  fs.writeFileSync(path.join(root, 'src', 'many.txt'), 'hello\n'.repeat(300));
+  assert.equal(read({ action: 'search', query: 'hello' }).length, 200);
+  console.log('Remote module listing, on-demand content, path validation and search tests passed.');
+} finally {
+  fs.rmSync(root, { recursive: true, force: true });
+}