实现快传，完善快传和网盘的功能，实现文件的互传等一系列功能

front/src/lib/file-share.test.ts

@@ -0,0 +1,32 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  buildFileShareUrl,
+  FILE_SHARE_ROUTE_PREFIX,
+  getPostLoginRedirectPath,
+} from './file-share';
+
+test('buildFileShareUrl builds a browser-router share url', () => {
+  assert.equal(
+    buildFileShareUrl('https://yoyuzh.xyz', 'share-token-1', 'browser'),
+    'https://yoyuzh.xyz/share/share-token-1',
+  );
+});
+
+test('buildFileShareUrl builds a hash-router share url', () => {
+  assert.equal(
+    buildFileShareUrl('https://yoyuzh.xyz/', 'share-token-1', 'hash'),
+    'https://yoyuzh.xyz/#/share/share-token-1',
+  );
+});
+
+test('getPostLoginRedirectPath keeps safe in-site paths only', () => {
+  assert.equal(getPostLoginRedirectPath('/share/share-token-1'), '/share/share-token-1');
+  assert.equal(getPostLoginRedirectPath('https://evil.example.com'), '/overview');
+  assert.equal(getPostLoginRedirectPath(null), '/overview');
+});
+
+test('FILE_SHARE_ROUTE_PREFIX stays aligned with the public share route', () => {
+  assert.equal(FILE_SHARE_ROUTE_PREFIX, '/share');
+});