Add Openchecker to OKAPI

[following5]

It would be pretty simple to add OCPL "Openchecker" support to OKAPI, e.g. a new method like services/caches/check. Should also include some throttling then, so that no "brute force" try-and-error checks are possible through OKAPI.

Checkers are often used on-site, so having that available e.g. in c:geo would be very nice.

Any thoughts / pros / cons on that?

[kojoty]

in my opinion it could be useful - no cons of that (of course if it is more-less resistant for brute-force like you mentioned)

[following5]

Okay. I will make a PR with implementation proposal.

Then, this would be the first OCPL-only feature, as you discussed with wrygiel in #463. :) But OCDE users also requested a checker ... maybe it will be added later.

[following5]

See also opencaching/opencaching-pl#1492: openchecker improvement: show nearing results

[andrixnet]

OCPL code already has brute force prevention built-in. Could be reused.