cnpmjs.org support custom storage, but all the storage need follow the rules:

• async function upload(filepath, options)
  • filepath: upload file path
  • options
    • key: identifie of this file
    • size: file size
• async function uploadBuffer(fileBuffer, options)
  • fileBuffer: upload file content buffer
  • options
    • key: identifie of this file
    • size: fileBuffer size
    • shasum: fileBuffer sha1
    • shasum256: fileBuffer sha256
• async function remove(key)
  • key: file identifie
• async function download(key, savePath, options)[optional]
  • key: file identifie
  • savePath: download path
  • options
    • timeout
• async function createDownloadStream(key, options)[optional]
  • key: file identifie
  • options
    • timeout
  • return {ReadStream}
• async function url(key)[optional] url method should be async function too.
  • key: file identifie
• async function readBytes(key, options)[optional]
  • key: file identifie
  • options
    • timeout
• async function appendBuffer(fileBuffer, options)[optional]
  • fileBuffer: upload file content buffer
  • options
    • key: identifie of this file

All function are async function.

1. Can download the uploaded file through http request. like qn-cnpm.

• uploadBuffer: use options.key to customize the filename, then callback {url: 'http://test.com/xxx.tgz'}.
• url: accept a key and respond download url.
• remove: remove file by key

2. Can not download by http request. like sfs-client or oss-cnpm.

• uploadBuffer: upload the file, and must callback {key: 'xxx'}, so cnpmjs.org can record the key, and use this key to download or remove.
• download: need provide download api to download the file by key.
• createDownloadStream: streaming download file by key
• remove: remove file by key

• fs: A filesystem storage wrapper
• sfs: A wrapper for a simple distribute file storage system sfs
• qn: qiniu cloud storage service wrapper
• oss: alicloud oss storage service wrapper
• upyun: upyun cloud storage service wrapper
• cos: cos Qcloud Cloud Object Storage
• s3-cnpm: s3-cnpm Amazon S3 storage wrapper
• s3-cnpmcore: S3 storage wrapper for cnpmcore, see https://github.com/cnpm/cnpmcore/issues/353