swagger_ui_engine

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swagger_ui_engine

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Include swagger-ui as rails engine and document your API with simple JSON or YAML files.

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# SwaggerUiEngine

Include [swagger-ui](https://github.com/swagger-api/swagger-ui) as Rails engine and document your API with simple YAML files.

[![Gem Version](https://badge.fury.io/rb/swagger_ui_engine.svg)](https://badge.fury.io/rb/swagger_ui_engine) [![Build Status](https://travis-ci.org/zuzannast/swagger_ui_engine.svg?branch=master)](https://travis-ci.org/zuzannast/swagger_ui_engine) [![Code Climate](https://codeclimate.com/github/zuzannast/swagger_ui_engine/badges/gpa.svg)](https://codeclimate.com/github/zuzannast/swagger_ui_engine)

## Versions

Swagger UI version | Rails version
------------------ | ----------------
2.2.10             | >= 4.2, <6

## Features
* Supports API documentation versioning / multiple APIs documentation
* Easily configurable Swagger interface and OAuth2 authorization
* Enables using Swagger interface translations
* Works with API-only applications
* Simple, clear and actively maintained :ok_woman:

## Problem
Working on a Rails API, I've wanted to document my endpoints in the clearest and easiest way possible. My goal was to have the documentation separated from the actual codebase and to have a web UI version of Swagger for testing and reading it. Using Rails 5 default API, I didn't need to include Grape, so I took a look into some other existing solutions. Most of them were no longer supported (e.g. [swagger_engine](https://github.com/batdevis/swagger_engine) and [swagger-ui_rails](https://github.com/d4be4st/swagger-ui_rails)) or required adding some extra code for the actual documentation (e.g. [swagger-docs](https://github.com/richhollis/swagger-docs)). Also, none of them supported Swagger web UI configuration, so I decided to write and maintain a gem on my own that would allow others to include Swagger web UI as Rails engine and support writing simple documentation in YAML files.

## Installation

Add to Gemfile

```
gem 'swagger_ui_engine'
```

And then run:

```
$ bundle
```

## Usage

### Mount

Add to your `config/routes.rb`

```
mount SwaggerUiEngine::Engine, at: "/api_docs"
```

You can place this route under `admin_constraint` or other restricted path, or configure basic HTTP authentication.

#### Devise auth

```
authenticate :user, lambda { |u| u.admin? } do
  mount SwaggerUiEngine::Engine, at: "/api_docs"
end
```

#### Basic HTTP auth

Set admin username and password in an initializer:

```
# config/initializers/swagger_ui_engine.rb

SwaggerUiEngine.configure do |config|
  config.admin_username = ENV['ADMIN_USERNAME']
  config.admin_password = ENV['ADMIN_PASSWORD']
end
```

### Initialize

#### Versioned API documentations

Set the path of your json/yaml versioned documentations in an initializer:

```
# config/initializers/swagger_ui_engine.rb

SwaggerUiEngine.configure do |config|
  config.swagger_url = {
    v1: 'api/v1/swagger.yaml',
    v2: 'api/v2/swagger.yaml',
  }
end
```

and place your main documentation file under `/public/api` path.

#### Single API documentation

**NOTE**: This is a compatibility patch for the `SwaggerUiEngine` gem versions `<= 0.0.5`. It's recommended to version your API documentation from the beginning.

You can define your main documentation url in a hash value (same way as in the versioned documentations) or pass single string with the url:

```
# config/initializers/swagger_ui_engine.rb

SwaggerUiEngine.configure do |config|
  config.swagger_url = 'api/swagger.yaml'
end
```

### Configure
Config Name | Swagger parameter name | Description
--- | --- | ---
config.swagger_url | url | The url pointing `swagger.yaml` (Swagger 2.0) as per [OpenAPI Spec](https://github.com/OAI/OpenAPI-Specification/). Accepts a Hash, with API version names as keys and documentation URLs as values. Also accepts a String pointing to documentation for all versions.
config.doc_expansion | docExpansion | Controls how the API listing is displayed. It can be set to 'none' (default), 'list' (shows operations for each resource), or 'full' (fully expanded: shows operations and their details).
config.model_rendering | defaultModelRendering | Controls how models are shown when the API is first rendered. It can be set to 'model' or 'schema', and the default is 'schema'.
config.request_headers | showRequestHeaders | Whether or not to show the headers that were sent when making a request via the 'Try it out!' option. Defaults to `false`.
config.json_editor | jsonEditor | Enables a graphical view for editing complex bodies.  Defaults to `false`.
config.translator_enabled | translations | Enables Swagger Ui translations. Defaults to `false`.
config.validator_enabled | validatorUrl | Enables documentation validator.  Defaults to `false` (`validatorUrl: 'null'`).

#### OAuth2 configuration
You can configure OAuth2 default authorization.

Config Name | Swagger parameter name | Description
--- | --- | ---
config.oauth_client_id | client_id | Default clientId. MUST be a string
config.oauth_client_secret | client_secret | Default clientSecret. MUST be a string
config.oauth_realm | realm | realm query parameter (for oauth1) added to `authorizationUrl` and `tokenUrl` . MUST be a string
config.oauth_app_name | appName | application name, displayed in authorization popup. MUST be a string
config.oauth_scope_separator | scopeSeparator | scope separator for passing scopes, encoded before calling, default value is a space (encoded value `%20`). MUST be a string
config.oauth_query_string_params | additionalQueryStringParams | Additional query parameters added to `authorizationUrl` and `tokenUrl`. MUST be an object

### Edit your json/yaml files

You can use [Swagger editor](https://github.com/swagger-api/swagger-editor) to write and validate your Swagger docs.

## Example app

Here's an example use of [SwaggerUiEngine in Rails application](https://github.com/zuzannast/swagger_ui_engine_example).

## Contributing

You're very much welcome to contribute to this repository. Start by creating a Github issue and describing your change thoroughly. If you decide to publish a pull request, please make sure it points to the latest versioned branch instead of master.

## License

This project is available under MIT-LICENSE. :sunny:

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