Implements the OAI-PMH protocol at the '/oai' endpoint.

[bmquinn]

Description

Implements the OAI-PMH protocol at the '/oai' endpoint. The endpoint supports both 'GET' and 'POST' requests according to the specification. All responses should return XML documents that validate against the OAI_PMH schema

Supports the following verbs:

• GetRecord
• Identify
• ListIdentifiers
• ListMetadataFormats
• ListRecords
• ListSets

Tests:
100% test coverage, check out test/integration/oai.test.js to see all the error case handling required by the OAI-PMH specification

Steps to test

For "list requests" (e.g. ListRecords):

• Make a request using the verb and metadataPrefix parameters: http://localhost:3000/oai?verb=ListRecords&metadataPrefix=oai_dc
• Make subsequent requests including the resumptionToken returned in the previous request: http://localhost:3000/oai?verb=ListRecords&metadataPrefix=oai_dc&resumptionToken=FGluY2x1ZGVfY29udGV4dF91dWlkDXF1ZXJ5QW5kRmV0Y2gBFm1jN3ZCajdnUURpbUhad1hIYnNsQmcAAAAAAAB2DhZXbmtMZVF5Q1JsMi1ScGRsYUlHLUtB
• Repeat the previous step until the list is complete. You'll know it is complete when you get an XML response with an empty resumptionToken element
• If you continue to make requests using that same resumptionToken you should get an error response with badResumptionToken

For all other verbs, pass in the verb and any required parameters using either POST or GET requests:

• curl http://localhost:3000/oai?verb=GetRecord&identifier=c02c149f-1df1-4252-ae93-79031c676e71&metadataPrefix=oai_dc
• curl -X POST 'http://localhost:3000/oai' --data 'verb=Identify'

[kdid]

Looks 👍