feat: API to save external links as attachments

[LIlGG]

What type of PR is this?

/kind api-change
/kind feature
/area core

What this PR does / why we need it:

see #2335

增加将第三方资源转存为附件资源的接口。

/apis/api.console.halo.run/v1alpha1/attachments/-/upload-from-url

UC:

/apis/uc.api.content.halo.run/v1alpha1/attachments/-/upload-from-url

其中参数为

{
  "url": "string",
  "filename": "string",
  "groupName": "string",
  "policyName": "string"
}

How to test it?

测试能否将第三方接口的资源保存至附件中。
测试各类附件，例如图片、视频、文本等。

Does this PR introduce a user-facing change?

增加通过链接转存第三方资源至附件库的接口

[codecov]

Codecov Report

Attention: Patch coverage is 52.10084% with 57 lines in your changes missing coverage. Please review.

Project coverage is 58.26%. Comparing base (6cd8dc8) to head (00bdf66).
Report is 15 commits behind head on main.

Files	Patch %	Lines
.../endpoint/uc/content/UcPostAttachmentEndpoint.java	28.57%	45 Missing ⚠️
...app/infra/DefaultReactiveUrlDataBufferFetcher.java	0.00%	4 Missing ⚠️
...n/java/run/halo/app/infra/utils/FileNameUtils.java	0.00%	4 Missing ⚠️
...ension/attachment/endpoint/AttachmentEndpoint.java	92.00%	1 Missing and 1 partial ⚠️
...tension/service/impl/DefaultAttachmentService.java	91.30%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6364      +/-   ##
============================================
+ Coverage     58.18%   58.26%   +0.08%     
- Complexity     3774     3786      +12     
============================================
  Files           651      651              
  Lines         22125    22221      +96     
  Branches       1538     1544       +6     
============================================
+ Hits          12873    12947      +74     
- Misses         8641     8663      +22     
  Partials        611      611              

☔ View full report in Codecov by Sentry.
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[JohnNiang]

Hi @LIlGG ，我已经创建了新的 PR 专门用来修改 API 文档的版本，这样可以避免当前 PR 产生一些无关的修改。

See #6378 for more.

待该 PR 合并后，你可以通过重新生成 API 文档和 api-client 来解决冲突。

./gradlew generateOpenApiDocs
make -C ui api-client-gen

[LIlGG]

Hi @LIlGG ，我已经创建了新的 PR 专门用来修改 API 文档的版本，这样可以避免当前 PR 产生一些无关的修改。

了解了，等此 PR 合并之后我会重新生成一次 OpenAPI。

[LIlGG]

/hold 目前接口还需要有很多需要考虑设计的地方，比如

• 安全性，对于第三方资源的类型进行限制。
• 文件大小，对于文件的大小进行限制。
• 需要对个人中心提供单独的接口。

因此暂时先停止合并，等待其配套工作完成之后再做此功能。

[JohnNiang]

Hi @LIlGG ，请先解决一下代码格式问题。

[LIlGG]

/unhold

对于文件安全性和大小的限制，在 PR #6390 中已经实现。

[guqing]

测试失败了需要修复一下

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[JohnNiang]

/ping @halo-dev/sig-halo
/approve

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing, JohnNiang, ruibaby

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