Swagger Support
===============

It is possible to make your application produce Swagger-compliant JSON output
based on ``@ApiDoc`` annotations, which can be used for consumption by
`swagger-ui`_.

Annotation options
------------------

A couple of properties has been added to ``@ApiDoc``:

To define a **resource description**::

    /**
     * @ApiDoc(
     *     resource=true,
     *     resourceDescription="Operations on users.",
     *     description="Retrieve list of users."
     *  )
     */
    public function listUsersAction()
    {
          /* Stuff */
    }

The ``resourceDescription`` is distinct from ``description`` as it applies to the
whole resource group and not just the particular API endpoint.

Defining a form-type as a GET form
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If you use forms to capture GET requests, you will have to specify the
``paramType`` to ``query`` in the annotation::

    /**
     * @ApiDoc(
     *    input = {"class" = "Foo\ContentBundle\Form\SearchType", "paramType" = "query"},
     *   ...
     * )
     */

    public function searchAction(Request $request)
    {

Multiple response models
------------------------

Swagger provides you the ability to specify alternate output models for
different status codes. Example, ``200`` would return your default resource object
in JSON form, but ``400`` may return a custom validation error list object. This
can be specified through the ``responseMap`` property::

    /**
     * @ApiDoc(
     *     description="Retrieve list of users.",
     *     statusCodes={
     *         400 = "Validation failed."
     *     },
     *     responseMap={
     *     	200 = "FooBundle\Entity\User",
     *         400 = {
     *             "class"="CommonBundle\Model\ValidationErrors",
     *             "parsers"={"Nelmio\ApiDocBundle\Parser\JmsMetadataParser"}
     *         }
     *     }
     *  )
     */
    public function updateUserAction()
    {
          /* Stuff */
    }

This will tell Swagger that ``CommonBundle\Model\ValidationErrors`` is returned
when this endpoint returns a ``400 Validation failed.`` HTTP response.

.. note::

    You can omit the ``200`` entry in the ``responseMap`` property and specify
    the default ``output`` property instead. That will result on the same thing.

Integration with ``swagger-api/swagger-ui``
---------------------------------------

You could import the routes for use with `swagger-ui`_.

.. code-block:: yaml

    #app/config/routing.yml
    nelmio_api_swagger:
        resource: "@NelmioApiDocBundle/Resources/config/swagger_routing.yml"
        prefix: /api-docs

Et voila!, simply specify http://yourdomain.com/api-docs in your ``swagger-ui``
instance and you are good to go.

.. note::

    If your ``swagger-ui`` instance does not live under the same domain, you
    will probably encounter some problems related to same-origin policy
    violations. `NelmioCorsBundle`_ can solve this problem for you. Read through
    how to allow cross-site requests for the ``/api-docs/*`` pages.

Dumping the Swagger-compliant JSON API definitions
--------------------------------------------------

To display all JSON definitions:

.. code-block:: bash

    $ php app/console api:swagger:dump

To dump just the resource list:

.. code-block:: bash

    $ php app/console api:swagger:dump --list-only

To dump just the API definition the ``users`` resource:

.. code-block:: bash

    $ php app/console api:swagger:dump --resource=users

Specify the ``--pretty`` flag to display a prettified JSON output.

Dump to files
~~~~~~~~~~~~~

You can specify the destination if you wish to dump the JSON definition to a file:

.. code-block:: bash

    $ php app/console api:swagger:dump --list-only swagger-docs/api-docs.json
    $ php app/console api:swagger:dump --resource=users swagger-docs/users.json

Or, you can dump everything into a directory in one command:

.. code-block:: bash

    $ php app/console api:swagger:dump swagger-docs

Model naming
------------

By default, the model naming strategy used is the ``dot_notation`` strategy. The
model IDs are simply the Fully Qualified Class Name (FQCN) of the class
associated to it, with the ``\`` replaced with ``.``:

.. code-block:: text

    Vendor\UserBundle\Entity\User => Vendor.UserBundle.Entity.User

You can also change the ``model_naming_strategy`` in the configuration to
``last_segment_only``, if you want model IDs to be just the class name minus the
namespaces (``Vendor\UserBundle\Entity\User => User``). This will not afford you
the guarantee that model IDs are unique, but that would really just depend on
the classes you have in use.

.. _`swagger-ui`: https://github.com/swagger-api/swagger-ui
.. _`NelmioCorsBundle`: https://github.com/nelmio/NelmioCorsBundle