视频号小店商家客服 API Implementation Plan

For agentic workers: REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (- [ ]) syntax for tracking.

Goal: 为 weixin-java-channel 增加商家客服媒体上传和消息发送 API。

Architecture: 以独立的客服子服务封装两条官方 API，通过既有 BaseWxChannelServiceImpl 完成鉴权、JSON 请求与 multipart 上传。请求模型保持强类型，服务层测试使用可记录调用的测试替身，避免真实网络依赖。

Tech Stack: Java 8、Maven、TestNG、Lombok、Jackson 注解。

Global Constraints

• Java 8 兼容，不新增依赖。
• API 路径固定为 /channels/ec/commkf/cosupload 和 /channels/ec/commkf/sendmsg。
• 使用 TestNG，所有新增测试不使用真实微信凭据。

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Task 1: 请求与响应模型

Files:

• Create: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/bean/kf/WxChannelKfCosUploadResponse.java

• Create: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/bean/kf/WxChannelKfSendMsgParam.java

• Create: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/bean/kf/WxChannelKfSendMsgResponse.java

• Test: weixin-java-channel/src/test/java/me/chanjar/weixin/channel/bean/kf/WxChannelKfBeanTest.java

• Write JSON encode/decode tests for request_id, open_id, msg_type, text.content, cos_url and msg_id.

• Run the test and verify it fails because the classes do not exist.

• Add the minimal annotated model classes and nested message content types.

• Run the test and verify it passes.

Task 2: 服务入口与请求执行

Files:

• Create: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/api/WxChannelKfService.java

• Create: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/api/impl/WxChannelKfServiceImpl.java

• Modify: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/api/WxChannelService.java

• Modify: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/api/impl/BaseWxChannelServiceImpl.java

• Modify: weixin-java-channel/src/main/java/me/chanjar/weixin/channel/constant/WxChannelApiUrlConstants.java

• Test: weixin-java-channel/src/test/java/me/chanjar/weixin/channel/api/impl/WxChannelKfServiceImplTest.java

• Write tests proving the service uses the documented URLs, uploads file, open_id, msg_type, decodes both responses, and caches getKfService().

• Run the test and verify it fails because the API is absent.

• Add the minimal service API, implementation, constants and cached service entry point.

• Run the focused tests and module test suite, then inspect git diff --check.