extends:
  - spectral:oas

# Spectral linting rules for the ClinicalTrials.gov Data API v2.
# https://clinicaltrials.gov/data-api/api — open, unauthenticated,
# JSON-by-default REST API hosted at https://clinicaltrials.gov/api/v2.
rules:
  ctg-info-contact:
    description: API contact information must be present.
    severity: error
    given: "$.info"
    then:
      field: contact
      function: truthy

  ctg-info-license:
    description: API license must be declared.
    severity: warn
    given: "$.info"
    then:
      field: license
      function: truthy

  ctg-server-https:
    description: All server URLs must use HTTPS.
    severity: error
    given: "$.servers[*].url"
    then:
      function: pattern
      functionOptions:
        match: "^https://"

  ctg-server-versioned:
    description: Data API server URL must include /api/v2.
    severity: warn
    given: "$.servers[?(@.url && @.url.indexOf('clinicaltrials.gov') > -1)].url"
    then:
      function: pattern
      functionOptions:
        match: "/api/v2$"

  ctg-operation-tags:
    description: Every operation must declare at least one tag.
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete]"
    then:
      field: tags
      function: schema
      functionOptions:
        schema:
          type: array
          minItems: 1

  ctg-operation-summary:
    description: Every operation must include a short summary.
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete]"
    then:
      field: summary
      function: truthy

  ctg-operation-id:
    description: Every operation must declare a unique operationId.
    severity: error
    given: "$.paths[*][get,post,put,patch,delete]"
    then:
      field: operationId
      function: truthy

  ctg-pagination-page-size:
    description: List endpoints should support pageSize and pageToken parameters.
    severity: info
    given: "$.paths[?(@property == '/studies')].get.parameters[*].name"
    then:
      function: enumeration
      functionOptions:
        values:
          - pageSize
          - pageToken
          - query.term
          - query.cond
          - query.intr
          - query.locn
          - filter.overallStatus
          - format
          - countTotal
          - fields

  ctg-nct-id-pattern:
    description: nctId path parameters should match the NCT identifier pattern.
    severity: warn
    given: "$.paths[?(@property.match(/{nctId}/))]"
    then:
      function: truthy