[wp-trac] [WordPress Trac] #39553: Use REST API endpoints for Plupload backend

[WordPress Trac]

#39553: Use REST API endpoints for Plupload backend
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 Reporter:  rmccue       |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.8
Component:  Media        |    Version:  4.7
 Severity:  normal       |   Keywords:  has-patch
  Focuses:  rest-api     |
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 `async-upload.php` currently handles all our backend uploading needs.
 However, with the new `POST /wp/v2/media` endpoint in the REST API, we no
 longer need a specialised API.

 I had a quick (30 min) go at converting this, and it actually worked out
 pretty well, which is crazy. There are sure to be a tonne of backwards
 compatibility concerns to tackle here (especially around the custom
 parameters that can be passed along), but I'm confident we can tackle
 them.

 Working proof-of-concept patch attached. This changes both the Media
 Library uploader (`wp-plupload.js`) and `media-new.php`
 (`media_upload_form`/`plupload/handlers.js`).

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Ticket URL: <https://core.trac.wordpress.org/ticket/39553>
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