fix: Z-Library 按需获取下载地址并发布 v2.1.4

src/_test/sources.test.js

@@ -16,6 +16,11 @@ test('注册表：每个源都实现完整接口', () => {
     }
     assert.ok(s.name, `${s.id} 缺 name`);
   }
+  assert.strictEqual(list.find((source) => source.id === 'zlib').downloadOnDemand, true);
+  assert.ok(
+    list.filter((source) => source.id !== 'zlib').every((source) => source.downloadOnDemand === false),
+    '只有会消耗下载额度的 Z-Library 应按点击解析'
+  );
 });
 
 test('注册表：开放教材与中英文维基文库已启用', () => {
@@ -527,7 +532,9 @@ test('zlib: postId 缺 hash 时详情仍可用', async () => {
     });
     const d = await zlib.detail('123/');
     assert.strictEqual(d.title, 'B');
+    assert.strictEqual(urls.length, 1, '打开详情不应顺带请求下载接口');
     assert.ok(urls[0].includes('/eapi/book/123'), urls[0]);
+    assert.ok(!urls[0].includes('/file'), '打开详情消耗了下载额度: ' + urls[0]);
     assert.ok(!urls[0].includes('/eapi/book/123/?'), '缺 hash 时不该留下尾斜杠: ' + urls[0]);
   } finally {
     auth.getSession = origSession;

src/_test/ui.test.js

@@ -218,6 +218,28 @@ test('下载区接入全局任务中心且完成按钮使用高对比绿色底
   assert.match(rule[1], /color:\s*#07130b/);
 });
 
+test('Z-Library 进入详情不消耗下载额度，点击下载后才解析并开始任务', () => {
+  const browse = fs.readFileSync(path.join(__dirname, '..', 'ui', 'views', 'browse.js'), 'utf8');
+  const openDetail = browse.slice(
+    browse.indexOf('async function openDetail'),
+    browse.indexOf('function sourceNameOf')
+  );
+  assert.match(openDetail, /if \(sourceDownloadsOnDemand\(activeSourceId\)\)/);
+  assert.match(openDetail, /renderOnDemandDownload\(postId, activeSourceId, token\)/);
+  assert.match(openDetail, /else\s*\{\s*loadDownload\(postId, activeSourceId, token\)/);
+
+  const onDemand = browse.slice(
+    browse.indexOf('function renderOnDemandDownload'),
+    browse.indexOf('// 当前条目的元数据')
+  );
+  const clickAt = onDemand.indexOf('btn.onclick = async');
+  const resolveAt = onDemand.indexOf('window.api.sources.download', clickAt);
+  const startAt = onDemand.indexOf('download.click()', resolveAt);
+  assert.ok(clickAt >= 0 && resolveAt > clickAt, '下载地址在用户点击前被获取');
+  assert.ok(startAt > resolveAt, '解析下载地址后没有立即开始真实下载');
+  assert.match(onDemand, /每日免费下载额度有限，仅在点击后获取下载地址/);
+});
+
 test('主窗口在设置旁提供持久化明暗主题切换', () => {
   const html = fs.readFileSync(path.join(__dirname, '..', 'ui', 'index.html'), 'utf8');
   const app = fs.readFileSync(path.join(__dirname, '..', 'ui', 'app.js'), 'utf8');