如何在不获取文件的情况下从 CID 和 UnixFS 元数据中确定文件内容类型？

Question

我正在寻找一种使用文件的 CID 和 UnixFS 元数据检测文件内容类型的方法，而不必使用幻数等方法获取实际文件内容和分析有效负载. 我对 IPFS 网关如何确定要在Content-Type响应标头中发送的值特别感兴趣.

IPFS moderator · Answer

In the current implementation, the file extension and magic bytes are used to determine the file type. For example, you can refer to the code snippet from Kubos repository here to see how this is done. However, we are also working on adding support for CBOR/JSON based on the codec from CID. This can be seen in the pull request here. With this enhancement, we will be able to skip the sniffing process for these specific data types. In the future, we plan to leverage metadata from UnixFS, which can be in either protobuf or _headers file format. This will further enhance our ability to accurately determine the file type. Please let me know if you have any further questions or if theres anything else I can assist you with.

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如何在不获取文件的情况下从 CID 和 UnixFS 元数据中确定文件内容类型？

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