Validation of request parameters/body according to openapi v3 json

[Ladas]

Lets design how to share validation in all of our APIs.

I have a POC, which is basically just testing that the validation gem I've picked works for ingress-api https://github.com/ManageIQ/topological_inventory-ingress_api/pull/47/files#diff-fdb60c134b290dc6cd1033a065180563R27

The gem I've picked and battle-tested is ota42y/openapi_parser#33 (with 1 pending PR)

I've tested it on ingress openapi.json which is pretty complex https://github.com/ManageIQ/topological_inventory-ingress_api/blob/master/public/doc/openapi-3-v0.0.2.json

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Now how do we want to integrate this to all of our APIs? As a before_action for controller? Into rack middleware (existing project is https://github.com/interagent/committee but supports only 1 schema per server)?. More thoughts?

[Ladas]

cc @Fryguy @agrare @gmcculloug @abellotti @bdunne who else might be interested?

[gmcculloug]

@Ladas Seeing @gtanzillo missing from the list is making me wonder if you meant him and not me. 🤔

[Ladas]

@gmcculloug ah I wanted to add all gregs :-) @Fryguy said that your team should be involved too, since we want the request validation in all services

[Ladas]

Implemented as before_action, @gmcculloug you should be able to use this in your projects for validation of API requests.