ColorfulClouds API Rules

# Caiyun Weather API (ColorfulClouds) — Spectral Ruleset
#
# Opinionated ruleset enforcing the conventions observed across the
# Caiyun Weather v2.6 OpenAPI spec. Path-embedded token, lng,lat tuple
# in path, snake_case JSON properties, camelCase operationIds, and
# Title Case tags prefixed with "Caiyun Weather".

rules:

  # ── INFO / METADATA ──────────────────────────────────────────────
  info-title-required:
    description: API title must be present and start with the provider prefix.
    severity: error
    given: $.info
    then:
      - field: title
        function: truthy
      - field: title
        function: pattern
        functionOptions:
          match: '^Caiyun Weather'

  info-description-min-length:
    description: API description must be present and detailed (>= 80 chars).
    severity: warn
    given: $.info
    then:
      - field: description
        function: truthy
      - field: description
        function: length
        functionOptions:
          min: 80

  info-version-required:
    description: API version must be present.
    severity: error
    given: $.info
    then:
      - field: version
        function: truthy

  info-contact-required:
    description: Contact object must be present with a URL.
    severity: warn
    given: $.info.contact
    then:
      - field: url
        function: truthy

  # ── OPENAPI VERSION ──────────────────────────────────────────────
  openapi-version-3:
    description: Spec must target OpenAPI 3.x.
    severity: error
    given: $.openapi
    then:
      function: pattern
      functionOptions:
        match: '^3\.'

  # ── SERVERS ──────────────────────────────────────────────────────
  servers-required:
    description: Servers array must be defined.
    severity: error
    given: $
    then:
      field: servers
      function: truthy

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

  servers-canonical-host:
    description: Servers should target api.caiyunapp.com.
    severity: warn
    given: $.servers[*]
    then:
      field: url
      function: pattern
      functionOptions:
        match: 'api\.caiyunapp\.com'

  # ── PATHS ────────────────────────────────────────────────────────
  paths-no-trailing-slash:
    description: Paths must not end with a trailing slash.
    severity: error
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        notMatch: '.+/$'

  paths-lowercase:
    description: Path segments must be lowercase (kebab-case allowed).
    severity: warn
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: '^[/{}a-z0-9._\-,]+$'

  paths-token-in-path:
    description: >-
      Caiyun encodes the API token as a path segment. Forecast paths must
      include the {token} parameter immediately after the version prefix.
    severity: warn
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: '^/(\{token\}/|precipitation/)'

  # ── OPERATIONS ───────────────────────────────────────────────────
  operation-operationId-required:
    description: Every operation must have an operationId.
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: truthy

  operation-operationId-camel:
    description: operationId must be camelCase.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: pattern
      functionOptions:
        match: '^[a-z][a-zA-Z0-9]+$'

  operation-summary-required:
    description: Every operation must have a summary.
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: truthy

  operation-summary-prefix:
    description: Summaries must begin with "Caiyun Weather".
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: pattern
      functionOptions:
        match: '^Caiyun Weather '

  operation-description-required:
    description: Every operation must have a description.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: description
      function: truthy

  operation-tags-required:
    description: Every operation must declare at least one tag.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: tags
      function: truthy

  operation-microcks-extension:
    description: Each operation should declare x-microcks-operation for mock parity.
    severity: info
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: x-microcks-operation
      function: truthy

  # ── TAGS ─────────────────────────────────────────────────────────
  tags-global-defined:
    description: Global tags array must be defined with descriptions.
    severity: warn
    given: $
    then:
      field: tags
      function: truthy

  tags-title-case:
    description: Global tag names must use Title Case (no kebab, no snake).
    severity: warn
    given: $.tags[*]
    then:
      field: name
      function: pattern
      functionOptions:
        match: '^[A-Z][A-Za-z0-9]*( [A-Z][A-Za-z0-9]*)*$'

  tags-description-required:
    description: Global tags must have descriptions.
    severity: info
    given: $.tags[*]
    then:
      field: description
      function: truthy

  # ── PARAMETERS ───────────────────────────────────────────────────
  parameter-description-required:
    description: Every parameter must have a description.
    severity: warn
    given: $..parameters[*]
    then:
      field: description
      function: truthy

  parameter-snake-case:
    description: Query and path parameters must use snake_case (lng, lat, dailysteps, hourlysteps, alert, begin, granu).
    severity: warn
    given: $..parameters[?(@.in == 'query')]
    then:
      field: name
      function: pattern
      functionOptions:
        match: '^[a-z][a-z0-9_]*$'

  parameter-schema-required:
    description: Every parameter must declare a schema with a type.
    severity: error
    given: $..parameters[*]
    then:
      - field: schema
        function: truthy

  # ── RESPONSES ────────────────────────────────────────────────────
  response-2xx-required:
    description: Each operation must declare at least one 2xx response.
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ['200']
            - required: ['201']
            - required: ['202']
            - required: ['204']

  response-401-on-token-paths:
    description: Token-bearing endpoints should document 401 Unauthorized responses.
    severity: warn
    given: $.paths[?(@property.match(/\{token\}/))][get].responses
    then:
      field: '401'
      function: truthy

  response-429-on-token-paths:
    description: Token-bearing endpoints should document 429 Too Many Requests responses.
    severity: warn
    given: $.paths[?(@property.match(/\{token\}/))][get].responses
    then:
      field: '429'
      function: truthy

  response-description-required:
    description: Every response object must have a description.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy

  response-json-content:
    description: Successful responses should be application/json (except precipitation map tiles).
    severity: info
    given: $.paths[?(!@property.match(/precipitation/))][get].responses.200.content
    then:
      field: application/json
      function: truthy

  # ── SCHEMAS ──────────────────────────────────────────────────────
  schema-property-snake-case:
    description: >-
      Schema property names must use snake_case to match Caiyun's JSON wire
      format (precipitation_2h, apparent_temperature, life_index, air_quality,
      cloudrate, dswrf, etc.). Exemptions are made for life-index sub-keys
      that ship in camelCase from the upstream API (carWashing, coldRisk).
    severity: warn
    given: $.components.schemas[*].properties
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: '^([a-z][a-z0-9_]*|carWashing|coldRisk)$'

  schema-type-required:
    description: Top-level schemas must declare a type.
    severity: warn
    given: $.components.schemas[*]
    then:
      field: type
      function: truthy

  schema-description-required:
    description: Top-level schemas should carry a description.
    severity: info
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy

  schema-skycon-enum:
    description: SkyCon enum must include the canonical Caiyun phenomena.
    severity: warn
    given: $.components.schemas.SkyCon
    then:
      field: enum
      function: schema
      functionOptions:
        schema:
          type: array
          contains:
            enum:
              - CLEAR_DAY
              - CLEAR_NIGHT
              - PARTLY_CLOUDY_DAY
              - PARTLY_CLOUDY_NIGHT
              - CLOUDY
              - LIGHT_RAIN
              - HEAVY_RAIN

  # ── SECURITY ─────────────────────────────────────────────────────
  security-defined:
    description: Global security must be declared.
    severity: warn
    given: $
    then:
      field: security
      function: truthy

  security-schemes-defined:
    description: Security schemes must be defined.
    severity: error
    given: $.components.securitySchemes
    then:
      function: truthy

  # ── HTTP METHOD CONVENTIONS ─────────────────────────────────────
  get-no-request-body:
    description: GET operations must not declare a request body.
    severity: error
    given: $.paths[*].get
    then:
      field: requestBody
      function: falsy

  caiyun-get-only-api:
    description: >-
      The Caiyun Weather API is read-only — operations should use GET.
    severity: warn
    given: $.paths[*]
    then:
      function: schema
      functionOptions:
        schema:
          not:
            anyOf:
              - required: [post]
              - required: [put]
              - required: [patch]
              - required: [delete]

  # ── GENERAL QUALITY ─────────────────────────────────────────────
  no-empty-descriptions:
    description: Descriptions must not be empty strings.
    severity: warn
    given: $..description
    then:
      function: truthy

  examples-on-parameters:
    description: Parameters should carry an example value.
    severity: info
    given: $..parameters[*]
    then:
      field: example
      function: truthy