Support openapi extensions in proper resources

[sergicastro]

Even openapi extensions specific documentation enumerates a list of allowed places where extensions can be used, there are more resources that can support them, for example, Servers as its specific documentation shows.

Current kin-openapi version 0.39.0 supports extensions in the resources described in openapi extensions doc.

But would be useful to expand extensions to the rest of the resources that support them.

Note: This applies to v2.0 and v3.0 specs.

[fenollp]

Could you be more specific?
Did you notice https://pkg.go.dev/github.com/getkin/[email protected]/openapi3#ExtensionProps
What do you feel is missing, exactly (an example?)?

[sergicastro]

Sure, I notice it, I used it in paths and I expect to be able to use it in servers, since openapi doc says servers support extensions:

Currently, I can call path.Extensions but not server.Extensions.

[sergicastro]

I guess, support extensions in the missing resources just requires the structs to extend ExtensionsProps, right?
I could take I look.

[sergicastro]

@fenollp thanks for your quick work. I added extensions to a few missing resources.