Download all assets

[m-mohr]

Once I've found some data using the search command, I'd like to download all assets. It would be a nice convenience functionality to add so that people don't need to fiddle around with fs libraries themselves.

[matthewhanson]

@gadomski and I discussed today. It seems a reasonable thing to expect PySTAC to support via the same STAC_IO mechanism, allowing other libraries to override to allow downloading using other protocols (e.g., s3).

By default this could support simple http requests. Recommend adding this as a PySTAC issue. Clients could then override this to support downloading using e.g., fsspec.

[gadomski]

N.B. I've created a separate library for this behavior here: https://github.com/gadomski/stac-asset. Once I release v0.1 of stac-asset, I plan on moving it to https://github.com/stac-utils, and we can could/should this issue in favor of that library.

Reasons why I thought a separate library was appropriate:

• stac-asset is async-first, which is pretty key for downloading a bunch of assets at once
• There's some vendor- and implementation-specific logic required to do multi-provider asset-download support. This logic might require more frequent updates than is appropriate for a "base" library like pystac-client.
• stac-asset's CLI is currently built to work well w/ pystac-client's CLI output, e.g.:

stac-client search http://stac-api.test -c foo --max-items 10 | stac-asset download

[gadomski]

Ok, we're moved to stac-utils, so I'm closing this issue as complete-via-other-repo: https://github.com/stac-utils/stac-asset.