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An object oriented approach to generating OpenAPI specs, implemented in PHP.
License: MIT License
Languages: PHP
An object oriented approach to generating OpenAPI specs, implemented in PHP.
You can build up your API spec using immutable PHP classes, and then export the spec to JSON (or YAML with the help of another package).
This package is dependency free and makes heavy use of PHP 7 features, mainly being type hints and enabling strict types. This should make your life a lot easier when working with a good IDE that can use this information.
You can install the package via composer:
composer require goldspecdigital/oooas
See the code sample below for the most basic usage:
use GoldSpecDigital\ObjectOrientedOAS\Objects\{
Info, MediaType, Operation, PathItem, Response, Schema, Tag
};
use GoldSpecDigital\ObjectOrientedOAS\OpenApi;
// Create a tag for all the user endpoints.
$usersTag = Tag::create()
->name('Users')
->description('All user related endpoints');
// Create the info section.
$info = Info::create()
->title('API Specification')
->version('v1')
->description('For using the Example App API');
// Create the user schema.
$userSchema = Schema::object()
->properties(
Schema::string('id')->format(Schema::FORMAT_UUID),
Schema::string('name'),
Schema::integer('age')->example(23),
Schema::string('created_at')->format(Schema::FORMAT_DATE_TIME)
);
// Create the user response.
$userResponse = Response::create()
->statusCode(200)
->description('OK')
->content(
MediaType::json()->schema($userSchema)
);
// Create the operation for the route (i.e. GET, POST, etc.).
$showUser = Operation::get()
->responses($userResponse)
->tags($usersTag)
->summary('Get an individual user')
->operationId('users.show');
// Define the /users path along with the supported operations.
$usersPath = PathItem::create()
->route('/users')
->operations($showUser);
// Create the main OpenAPI object composed off everything created above.
$openApi = OpenApi::create()
->openapi(OpenApi::OPENAPI_3_0_2)
->info($info)
->paths($usersPath)
->tags($usersTag);
header('Content-Type: application/json');
echo $openApi->toJson();
Using the same code above will output the following YAML:
In this example, the YAML may seem simpler to look at, however once the spec starts to increase in size - the ability to reuse objects and split them into separate files easily will be a massive help.
openapi: 3.0.2
info:
title: API Specification
description: For using the Example App API
version: v1
paths:
"/users":
get:
tags:
- Users
summary: Get an individual user
operationId: users.show
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
properties:
id:
format: uuid
type: string
name:
type: string
age:
type: integer
example: 23
created_at:
format: date-time
type: string
tags:
- name: Users
description: All user related endpoints
Built in output to YAML has been omitted on purpose to keep this package dependency free. However, you can easily convert the array to a YAML string using several open source packages. See below for an example of outputting to both JSON and YAML:
use GoldSpecDigital\ObjectOrientedOAS\OpenApi;
use Symfony\Component\Yaml\Yaml;
$openApi = OpenApi::create();
$json = $openApi->toJson();
$array = $openApi->toArray();
$yaml = Yaml::dump($array);
If you want to learn more about the OpenAPI schema, then have a look at the official OpenAPI Specification.
Alternatively, if you would like a quick reference, then check out the OpenAPI Map project created by Arnaud Lauret.
You can use this interactive tool to figure out what objects go where and how they relate to one another.
Each object has setter methods for it's supported properties. Most of these
methods allow null
values which will need to be explicitly passed (see the
next example for how to unset using variadic setter methods). This will have the
effect of unsetting the property:
$info = Info::create()
->title('Example API');
$openApi = OpenApi::create()
->info($info);
echo $openApi->toJson(); // '{"info": {"title": "Example API"}}'
$openApi = $openApi->info(null);
echo $openApi->toJson(); // '{}'
For variadic setter methods, if you call the method and don't supply any parameters, then this will have the effect of unsetting the property:
$path = PathItem::create()
->route('/users');
$openApi = OpenApi::create()
->paths($path);
echo $openApi->toJson(); // '{"paths": {"/users": []}}'
$openApi = $openApi->paths();
echo $openApi->toJson(); // '{}'
You can easily retrieve a property using a magic getter. These have been implemented for all properties for every object. DocBlocks have been provided to give better auto-completion in IDEs:
$info = Info::create()->title('Example API');
echo $info->title; // 'Example API'
Every object has an optional $objectId
property which is a string
and can
either be set in the class constructor or the preferred create()
method. This
property is used when a parent object needs to use a name for the children.
An example of this in use is when a schema object is composed of other schema properties:
$schema = Schema::create()
->type(Schema::TYPE_OBJECT)
->properties(
Schema::create('username')->type(Schema::TYPE_STRING),
Schema::create('age')->type(Schema::TYPE_INTEGER)
);
echo $schema->toJson();
/*
{
"type": "object",
"properties": {
"username": {
"type": "string"
},
"age": {
"type": "integer"
}
}
}
*/
If an object contains any helper creation methods, then these methods also allow
you to specify the $objectId
property as a parameter. The code sample below is
functionally identical to the one above:
$schema = Schema::object()
->properties(
Schema::string('username'),
Schema::integer('age')
);
echo $schema->toJson();
/*
{
"type": "object",
"properties": {
"username": {
"type": "string"
},
"age": {
"type": "integer"
}
}
}
*/
The use of $ref
has been applied to every single object to use as you wish.
You may substitute any object for a $ref
by invoking the ref()
static method
on the object class:
$schema = AllOf::create()
->schemas(
Schema::ref('#/components/schemas/ExampleSchema')
);
echo $schema->toJson();
/*
{
"allOf": [
["$ref": "#/components/schemas/ExampleSchema"]
]
}
*/
You can add specification extensions to all objects:
$schema = Schema::create()
->x('foo', 'bar')
->x('items', Schema::array()->items(Schema::string()));
echo $schema->toJson();
/*
{
"x-foo": "bar",
"x-items": {
"type": "array",
"items": {
"type": "string"
}
}
}
*/
echo $schema->{'x-foo'}; // 'bar'
You can also unset specification extensions by invoking the x()
method and
only providing the key:
$schema = Schema::create()
->x('foo', 'bar')
->x('items', Schema::array()->items(Schema::string()));
$schema = $schema->x('foo');
echo $schema->toJson();
/*
{
"x-items": {
"type": "array",
"items": {
"type": "string"
}
}
}
*/
To retrieve an array of all the specification extensions you can call the $x
property:
$schema = Schema::create()
->x('foo', 'bar')
->x('items', Schema::array()->items(Schema::string()));
echo json_encode($schema->x);
/*
{
"x-foo": "bar",
"x-items": {
"type": "array",
"items": {
"type": "string"
}
}
}
*/
In order to perform schema validation you must first install the
justinrainbow/json-schema
package:
composer require justinrainbow/json-schema:^5.2
Once installed, you may now make use of the validate()
method on the OpenApi
object:
$openApi = OpenApi::create();
$openApi->validate();
If you haven't installed the justinrainbow/json-schema
package and attempt to
use the validate()
method, then a RuntimeException
will be thrown.
If validation fails for the schema, then a
GoldSpecDigital\ObjectOrientedOAS\Exceptions\ValidationException
will be
thrown. You can use the getErrors()
method on this exception to retrieve all
of the validation errors.
To run the test suite you can use the following commands:
# To run both style and unit tests.
composer test
# To run only style tests.
composer test:style
# To run only unit tests.
composer test:unit
If you receive any errors from the style tests, you can automatically fix most, if not all of the issues with the following command:
composer fix:style
Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.
We use SemVer for versioning. For the versions available, see the tags on this repository.
See also the list of contributors who participated in this project.
This project is licensed under the MIT License - see the LICENSE.md file for details.