Affirm API Rules

# affirm — Spectral ruleset (strengthened)
# Plain Spectral. Existing hand-authored rules preserved; measured rules added
# from this provider's own OpenAPI conventions by strengthen_ruleset.py,
# then self-validated against the spec.
#
# Provenance:
#   - servers-https-only: 100% of servers already https (error)
#   - servers-expected-domain: 9/9 servers on affirm.com
#   - path-params-casing: snake @ 100% (n=18)
#   - query-params-casing: snake @ 100% (n=18)
#   - operationid-casing: camel @ 100% (n=29)
#   - schema-names-casing: pascal @ 100% (n=29)
#   - schema-properties-casing: snake @ 100% (n=186)
#   - security: global (root) — NOT emitting operation-security-required
#   - error-schema-defined: Error
#   - operation-documents-401: 100% adherence
#   - pagination params observed: ['cursor', 'limit']
#   - merge: kept 35 existing, added 7 measured, upgraded 0
#   - added: servers-expected-domain, path-params-casing, query-params-casing, schema-names-casing, schema-properties-casing, error-schema-defined, operation-documents-401
extends:
  - spectral:oas
rules:
  info-title-required:
    description: API title must be present and start with "Affirm"
    severity: error
    given: $.info
    then:
    - field: title
      function: truthy
  info-title-affirm-prefix:
    description: API title must start with "Affirm"
    severity: warn
    given: $.info.title
    then:
      function: pattern
      functionOptions:
        match: ^Affirm
  info-description-required:
    description: API info must have a description
    severity: error
    given: $.info
    then:
      field: description
      function: truthy
  info-version-required:
    description: API version must be present
    severity: error
    given: $.info
    then:
      field: version
      function: truthy
  info-contact-required:
    description: Contact information should be provided
    severity: warn
    given: $.info
    then:
      field: contact
      function: truthy
  openapi-version:
    description: OpenAPI version must be 3.x
    severity: error
    given: $
    then:
      field: openapi
      function: pattern
      functionOptions:
        match: ^3\.
  servers-defined:
    description: Servers must be defined
    severity: error
    given: $
    then:
      field: servers
      function: truthy
  servers-https:
    description: All server URLs must use HTTPS
    severity: error
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: ^https://
  servers-description:
    description: Server entries should have descriptions
    severity: warn
    given: $.servers[*]
    then:
      field: description
      function: truthy
  paths-kebab-case:
    description: Path segments should use kebab-case
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        match: ^(/[a-z0-9{}-]+)+$
  paths-no-trailing-slash:
    description: Paths must not have trailing slashes
    severity: error
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        notMatch: /$
  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-affirm-prefix:
    description: Operation summaries must start with "Affirm"
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].summary
    then:
      function: pattern
      functionOptions:
        match: ^Affirm
  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-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-case:
    description: OperationIds should use camelCase
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].operationId
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-zA-Z0-9]+$
  operation-tags-required:
    description: Every operation must have at least one tag
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: tags
      function: truthy
  tag-global-defined:
    description: Global tags array should be defined
    severity: warn
    given: $
    then:
      field: tags
      function: truthy
  tag-description:
    description: Tags should have descriptions
    severity: warn
    given: $.tags[*]
    then:
      field: description
      function: truthy
  parameter-description-required:
    description: All parameters must have descriptions
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    then:
      field: description
      function: truthy
  parameter-schema-type:
    description: Parameters must have a schema with a type
    severity: error
    given: $.paths[*][get,post,put,patch,delete].parameters[*].schema
    then:
      field: type
      function: truthy
  request-body-description:
    description: Request bodies should have descriptions
    severity: warn
    given: $.paths[*][post,put,patch].requestBody
    then:
      field: description
      function: truthy
  request-body-json-content:
    description: Request bodies should include application/json content type
    severity: warn
    given: $.paths[*][post,put,patch].requestBody.content
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          minProperties: 1
  response-success-required:
    description: Every operation must have a 2xx success response
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          anyOf:
          - required:
            - '200'
          - required:
            - '201'
          - required:
            - '204'
  response-description-required:
    description: All response objects must have descriptions
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy
  response-401-defined:
    description: Operations using auth should document 401 responses
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          required:
          - '401'
  schema-description:
    description: Top-level schemas should have descriptions
    severity: warn
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy
  schema-properties-snake-case:
    description: Schema property names should use snake_case
    severity: info
    given: $.components.schemas[*].properties[*]~
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-z0-9_]*$
  schema-type-defined:
    description: Schema objects should have a type defined
    severity: warn
    given: $.components.schemas[*]
    then:
      field: type
      function: truthy
  security-schemes-defined:
    description: Security schemes must be defined in components
    severity: error
    given: $.components
    then:
      field: securitySchemes
      function: truthy
  security-global-defined:
    description: Global security should be defined
    severity: warn
    given: $
    then:
      field: security
      function: truthy
  get-no-request-body:
    description: GET operations must not have request bodies
    severity: error
    given: $.paths[*].get
    then:
      field: requestBody
      function: falsy
  delete-no-request-body:
    description: DELETE operations should not have request bodies
    severity: warn
    given: $.paths[*].delete
    then:
      field: requestBody
      function: falsy
  no-empty-descriptions:
    description: Descriptions must not be empty strings
    severity: error
    given: $..description
    then:
      function: pattern
      functionOptions:
        match: .+
  operation-examples-encouraged:
    description: Operations should have examples for better documentation
    severity: info
    given: $.paths[*][get,post,put,patch,delete].responses[*].content.application/json
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          anyOf:
          - required:
            - example
          - required:
            - examples
  servers-expected-domain:
    description: Server URLs should be on the affirm.com domain.
    severity: warn
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: affirm\.com
  path-params-casing:
    description: Path parameters should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.paths[*].parameters[?(@.in=='path')].name
    then:
      function: casing
      functionOptions:
        type: snake
  query-params-casing:
    description: Query parameters should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[?(@.in=='query')]
    then:
      field: name
      function: casing
      functionOptions:
        type: snake
  schema-names-casing:
    description: Component schema names should be PascalCase (the dominant convention in this API).
    severity: warn
    given: $.components.schemas
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: pascal
  schema-properties-casing:
    description: Schema properties should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.components.schemas[*].properties
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: snake
  error-schema-defined:
    description: A shared error schema (Error) should be defined for error payloads.
    severity: warn
    given: $.components.schemas
    then:
      field: Error
      function: truthy
  operation-documents-401:
    description: Operations should document a 401 response (documented on 100% of this API's operations).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      field: '401'
      function: truthy