National Tsing Hua University API Rules

# method: derived
# x-source-url: openapi/_original/nthu-data-api.yaml (NTHU Student Association contract)
# note: Authored by API Evangelist, not published by National Tsing Hua University.
formats:
- oas3
rules:
  nthu-info-version:
    description: 'API info must carry a semantic version (observed: 2.0.0).'
    given: $.info
    severity: warn
    then:
      field: version
      function: truthy
  nthu-operation-id:
    description: Every operation must declare an operationId (NTHU uses camelCase
      getX/listX/searchX).
    given: $.paths[*][get,post,put,delete]
    severity: error
    then:
      field: operationId
      function: truthy
  nthu-operation-tags:
    description: Operations are grouped by campus unit tag (Announcements, Buses,
      Courses, etc.).
    given: $.paths[*][get,post,put,delete]
    severity: warn
    then:
      field: tags
      function: truthy
  nthu-snake-case-properties:
    description: Schema property names use snake_case (with documented camelCase exceptions
      like routeEN).
    given: $.components.schemas[*].properties[*]~
    severity: hint
    then:
      function: pattern
      functionOptions:
        match: ^[a-zA-Z][a-zA-Z0-9_]*$
  nthu-uri-format-on-links:
    description: 'Link/url/image fields should declare format: uri.'
    given: $.components.schemas[*].properties[link,url,image]
    severity: hint
    then:
      field: format
      function: truthy