Enable response validation per OpenAPI spec

[mjgiarlo]

1. Uncomment # config.middleware.use Committee::Middleware::ResponseValidation, schema_path: 'openapi.yml' in config/application.rb
2. Run the specs and watch the failures
3. Fix the failures

[aaron-collier]

This is blocked by:

interagent/committee#257

Since some of our responses are XML and the committee gem requires responses to be JSON for validation.

[jmartin-sul]

i believe this may now be unblocked, as the committee issue linked from april 2020 appears to have been fixed in august 2020. @aaron-collier, i'm going to move this into "in progress", but if you'd prefer to unassign yourself and kick it back to "ready", no objection from me. there may be other blockers besides interagent/committee#257, but seems worth a re-visit to find out what specifically.

[aaron-collier]

@jmartin-sul just saw this in the in-progress column, happy to pick it back up.

[justinlittman]

For what it is worth, I believe that for other apps, we only do response validation during tests.

[justinlittman]

See https://github.com/sul-dlss/dor-services-app/blob/main/config/application.rb#L57-L66

[aaron-collier]

I think this is still blocked by interagent/committee#300

Well, that ticket is a feature request for the same issue I'm seeing working on this:

     Committee::InvalidResponse:
       #/components/schemas/ContentDiff expected object, but received String: "<?xml version=\"1.0\"?>\n<fileInventoryDifference objectId=\"xx123yy9999\" differenceCount=\"0\" basis=\"v0\" other=\"new-contentMetadata-all\" reportDatetime=\"2022-11-01T20:05:54Z\">\n  <fileGroupDifference groupId=\"content\" differenceCount=\"0\" identical=\"0\" copyadded=\"0\" copydeleted=\"0\" renamed=\"0\" modified=\"0\" added=\"0\" deleted=\"0\">\n    <subset change=\"identical\" count=\"0\"/>\n    <subset change=\"copyadded\" count=\"0\"/>\n    <subset change=\"copydeleted\" count=\"0\"/>\n    <subset change=\"renamed\" count=\"0\"/>\n    <subset change=\"modified\" count=\"0\"/>\n    <subset change=\"added\" count=\"0\"/>\n    <subset change=\"deleted\" count=\"0\"/>\n  </fileGroupDifference>\n</fileInventoryDifference>\n"