New API call - POST /choir/songpart/upload

[glynnbird]

This API call takes three parameters:

• choirId - the id of the choir
• songId - the id of the song whose part is being uploaded
• partId - the id of the song part being uploaded
• extension - the file extension e.g. webm (without the .)

It assumes that POST /choir/songpart has already been called to generate a partId - that API call records the data in the database. This API call grants access to upload the video file by creating a presigned URL that can be used by the front-end to upload the song part without having access to COS.

Returns:

{
  ok: true,
  method: 'PUT',
  url: 'https://some.url.com/path/key',
  key: 'x+y+z.web',
  bucket: 'mybucket'
}

The supplied URL will only work for a ten minutes.