Provide API for download file from provider URL

[alphakevin]

Description

1. Client request for original URL of specified file.
2. Server redirects or returns signed URL points to provider.
3. Client get the file or make another request with the returned URL.

Sketch

Redirect

GET http://server-host/api/namespaces/:namespace/files/:files_id/download?origin=1

Response

HTTP/1.1 301 Moved Permanently
Location: <origin-url>

Fetch URL

GET http://server-host/api/namespaces/:namespace/files/:files_id/origin-url?download=1

Response

{
  url: '<origin-url>',
}

Batch fetch URLs

POST http://server-host/api/namespaces/:namespace/urls

{
  download: true,
  origin: true,
  files: [
    '<file1_id>',
    '<file2_id>',
    ...
  ]
}

Response

[
  {
    id: '<file1_id>',
    url: '<url1>',
  },
  {
    id: '<file2_id>',
    url: '<url2>',
  },
  ...
]

[zhf]

By client, you mean cube-server or end-user?
and server...

[alphakevin]

@zhf the client is a nexusdocs-client instance or the app using it, the server is the nexusdocs-server instance.

Requested url could be generated earlier, and when user request for the url, if origin parameter is set true and not using a native gridfs provider, the server will redirect user to the original url of the provider.

[alphakevin]

Converting images is also supported by Ali OSS provider now!