extends: ["spectral:oas"]
documentationUrl: https://www.crossref.org/documentation/retrieve-metadata/rest-api/
rules:
  crossref-info-contact:
    description: API info object should reference Crossref contact.
    given: "$.info.contact"
    severity: error
    then:
      field: url
      function: pattern
      functionOptions:
        match: "crossref"
  crossref-required-paths:
    description: API must define core entity collections used across the platform.
    given: "$.paths"
    severity: error
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          required:
            - /works
            - /journals
            - /members
            - /funders
            - /types
            - /licenses
            - /prefixes
  crossref-doi-paths:
    description: API must define lookup paths for individual DOIs and agency.
    given: "$.paths"
    severity: error
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          required:
            - /works/{doi}
            - /works/{doi}/agency
  crossref-operation-id:
    description: All operations must define an operationId.
    given: "$.paths.*.*"
    severity: error
    then:
      field: operationId
      function: truthy
  crossref-tags:
    description: All operations must define tags.
    given: "$.paths.*.*"
    severity: error
    then:
      field: tags
      function: truthy
  crossref-works-tag:
    description: Works endpoints should be tagged with Works.
    given: "$.paths['/works','/works/{doi}'].get.tags"
    severity: warn
    then:
      function: schema
      functionOptions:
        schema:
          type: array
          contains:
            const: Works