fix: browser API chrome.downloads.download 代码及Mock修正#1410
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Pull request overview
该 PR 旨在修复 chrome.downloads.download 在存在 onDeterminingFilename 监听器时可能忽略 filename 的 Chromium 已知问题（Close #1409），通过在 service worker 侧引入统一的下载封装来稳定处理文件名覆盖，并同步完善 chrome.downloads 的 mock 与单元测试，确保行为可回归验证。
Changes:
- 新增
startDownload下载封装：集中处理onDeterminingFilename+onChanged，并为调用方提供完成/中断回调。 - 将 service worker 中相关下载调用（如备份导出、GM_download）改为使用新封装，以规避文件名覆盖失效问题。
- 重写
chrome.downloadsmock，补齐 Promise/callback 形态与事件模拟，并新增对应单测覆盖。
Reviewed changes
Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
| src/app/service/service_worker/synchronize.ts | 备份导出下载改为走 startDownload 封装 |
| src/app/service/service_worker/gm_api/gm_api.ts | GM_download 下载流程改为使用 startDownload + 回调通知 |
| src/app/service/service_worker/download.ts | 新增下载封装：注册/卸载监听、文件名覆盖与完成/中断回调 |
| src/app/service/service_worker/download.test.ts | 为下载封装与 mock 下载行为新增单测覆盖 |
| src/app/service/content/gm_api/gm_api.ts | 优化 native->browser 下载链路的 Object URL 释放时机（覆盖更多回包分支） |
| packages/chrome-extension-mock/index.ts | chromeMock.init 时重置 downloads mock 状态 |
| packages/chrome-extension-mock/downloads.ts | 重写 downloads mock：支持 Promise/callback、事件与文件名决策流程 |
Comment on lines
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| @@ -1060,30 +1061,44 @@ export default class GMApi extends GM_Base { | |||
| } as GMTypes.DownloadDetails<string>, | |||
| ]); | |||
| if (aborted) return; | |||
| let released = false; | |||
| const releaseResources = () => { | |||
| if (released) return; | |||
| released = true; | |||
| setTimeout(() => { | |||
| // 释放不需要的 URL | |||
| URL.revokeObjectURL(url); | |||
| }, 1); | |||
| }; | |||
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先研究一下 Copilot 的说法 DRAFT PR |
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Description / 描述
Close #1409
chrome.downloads.onDeterminingFilename。这是官方已知的 Chromium Bug。 https://issues.chromium.org/issues/40706258 。实作起来可以解决问题，所以就先这样吧。chrome.downloads.onDeterminingFilename，重新包装了chrome.downloads.download相关的操作。chrome.downloads的 mockScreenshots / 截图
Filename for chrome.downloads.download is ignored if onDeterminingFilename listener exists
https://issues.chromium.org/issues/40734759