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OpenAPI Integration

This document explains what OpenAPI is, how the reference architecture uses it, and how to keep the spec in sync with your code.

What Is OpenAPI?​

OpenAPI (formerly Swagger) is a language-agnostic specification for describing HTTP APIs. A single openapi.json file documents every endpoint, its parameters, request bodies, and response schemas. This single source of truth drives:

  • Runtime routing – OpenApiRouteList reads openapi.json to map incoming requests to controller methods.
  • Swagger UI – An interactive browser UI is served at http://localhost:8080/docs/ so you can explore and test endpoints without a separate tool.
  • Contract testing – OpenApiValidation (via ByJG\ApiTools) asserts that every test response conforms to the declared schema.

How swagger-php Scans src/​

The project uses zircote/swagger-php to scan PHP attribute annotations in src/ and produce public/docs/openapi.json.

Run the generator whenever you add or change annotations:

APP_ENV=dev composer run openapi

The composer script invokes swagger-php with the src/ directory as the scan target. The output is written to public/docs/openapi.json.

The Generated File​

public/docs/openapi.json is generated and should be committed to version control so that:

  • The application can boot without running the generator.
  • Tests can validate responses even in CI environments.
  • Swagger UI always has an up-to-date spec to render.

Swagger UI​

When the dev server is running, open http://localhost:8080/docs/ to browse the interactive API documentation. Every endpoint, parameter, and schema defined in openapi.json is rendered with a built-in "Try it out" feature.

Contract Testing Overview​

BaseApiTestCase mixes in OpenApiValidation, which intercepts every sendRequest() call and validates the HTTP response against the schema declared in openapi.json. This means:

  • A missing required field in the response body causes the test to fail.
  • An undocumented status code causes the test to fail.
  • Schema drift between code and spec is caught automatically in CI.

See Testing for practical examples.

Keeping the Spec in Sync​

Keep docs in sync

Whenever you change PHP attribute annotations in src/, rerun APP_ENV=dev composer run openapi. The regenerated public/docs/openapi.json is what OpenApiRouteList reads at runtime and what the tests validate against.

A common workflow:

  1. Add or update #[OA\Get], #[OA\Post], etc. attributes in a controller.
  2. Run APP_ENV=dev composer run openapi to regenerate the spec.
  3. Run APP_ENV=test composer run test to verify the new endpoint passes contract tests.
  4. Commit both the updated controller and the regenerated openapi.json.