OAD [ōd]

Parse, validate and convert OpenAPI Definitions in exist-db.

This is a wrapper around the Swagger-Parser library.

Installation

1. Download a pre-built XAR from the releases
2. Install the package in your exist-db instance
3. Restart the database
4. Try

   import module namespace oad="//eeditiones.org/ns/oad";
   
   oad:report('https://petstore3.swagger.io/api/v3/openapi.json')

Usage

All module functions assume you have a API specification stored in exist or available via HTTP. The spec can be YAML or JSON. It allows to work with internal and external references.

In order for the Swagger-parser to be able to resolve external, relative references all of them need to be public.

If $uri is a DB-path (with or without xmldb:) it will be converted to a REST-lookup first. This means the REST endpoint must be accessible.

Example

If you have a specification stored in /db/apps/myapp/api.json

{
  "openapi" : "3.0.2",
  "info" : { "title" : "my specification", "version": "1.0.0" },
  "paths" : {
    "/find" : {
      "get" : {
        "responses" : {
          "200" : {
            "description" : "result",
            "content" : {
              "text/plain" : {
                "schema" : {
                  "type" : "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Then

import module namespace oad="//eeditiones.org/ns/oad";

oad:report('/db/apps/myapp/api.json')

will return

<info>
    <title>my specification</title>
    <description/>
    <version>1.0.0</version>
    <servers>
        <server url="/"/>
    </servers>
</info>

and

import module namespace oad="//eeditiones.org/ns/oad";

oad:validate('/db/apps/myapp/api.json')

yields

true()

Functions

oad:validate($uri as xs:string) as xs:boolean

Returns true() if the API definition is valid, false() otherwise (use oad:report to see the list of issues found).

oad:report($uri as xs:string) as document()

Inspect the given definition and summarize the information into an XML document with an info-element at its root. If the parser encounters issues these are listed as separate error-elements under errors.

oad:flatten($uri as xs:string) as xs:string

Flatten will inspect the given definition and extract schemas, parameters and such into components. They are then replaced by references.

oad:resolve($uri as xs:string) as xs:string

Resolves both internal and external references in an API definition. This will allow you to use it with Roaster, for example.

oad:convert($uri as xs:string, map(xs:string, *)) as xs:string

The swiss-army knife of the available functions. Can convert definitions from one format to the other (JSON to YAML/ YAML to JSON) while also allowing you to either resolve or flatten the definition.

The available options are listed in the table below:

option	description	allowed values	default
format	serialization format	"json", "yaml"	"json"
method	what to do with references?	"flatten", "resolve""	none

Build

• Requirements
  • Java 8
  • Apache Maven 3.3+

mvn package

will create a oad-<version>.xar file in the target/ sub-folder.

Tests

There are no unit tests that will be executed when building the project. The build package does include xqsuite tests which test the integration into exist-db works as intended.

You can call that as part of your development workflow by running

./run-integration-tests.sh

Release

mvn release:prepare

mvn release:perform