Available from Camel 2.19

The rest-swagger configures rest producers from Swagger (Open API) specification document and delegates to a component implementing the RestProducerFactory interface. Currently known working components are:

Maven users will need to add the following dependency to their pom.xml for this component:

URI format

 

Where operationId is the ID of the operation in the Swagger specification, and specificationPath is the path to the specification.
If the `specificationPath` is not specified it defaults to swagger.json. The lookup mechanism uses Camel's ResourceHelper to load the resource, which means that you can use CLASSPATH resources (classpath:my-specification.json), files (file:/some/path.json), the web (http://api.example.com/swagger.json) or reference a bean (ref:nameOfBean) or use a method of a bean (bean:nameOfBean.methodName) to get the specification resource, failing that Swagger's own resource loading support.

This component does not act as a HTTP client, it delegates that to another component mentioned above. The lookup mechanism searches for a single component that implements the RestProducerFactory interface and uses that. If the CLASSPATH contains more than one, then the property componentName should be set to indicate which component to delegate to.

Most of the configuration is taken from the Swagger specification but the option exists to override those by specifying them on the component or on the endpoint. Typically you would just need to override the host or basePath if those differ from the specification.

NOTE: The host parameter should contain the absolute URI containing scheme, hostname and port number, for instance https://api.example.com.

With componentName you specify what component is used to perform the requests, this named component needs to be present in the Camel context and implement the required RestProducerFactory interface - as do the components listed at the top.

If you do not specify the componentName at either component or endpoint level, CLASSPATH is searched for a suitable delegate. There should be only one component present on the CLASSPATH that implements the RestProducerFactory interface for this to work.

Name

Default Value

Description

basePath

""

API basePath for example /v2. Default is unset if set overrides the value present in Swagger specification.

componentName

null

Name of the Camel component that will perform the requests. The compnent must be present in Camel registry and it must implement RestProducerFactory service provider interface. If not set CLASSPATH is searched for single component that implements RestProducerFactory SPI. Can be overriden in endpoint configuration.

consumes

null

What payload type this component capable of consuming. Could be one type like application/json or multiple types as application/json application/xml; q=0.5 according to the RFC7231. This equates to the value of Accept HTTP header. If set overrides any value found in the Swagger specification. Can be overriden in endpoint configuration

host

null

Scheme hostname and port to direct the HTTP requests to in the form of http[s]://hostname:port. Can be configured at the endpoint component or in the correspoding REST configuration in the Camel Context. If you give this component a name (e.g. petstore) that REST configuration is consulted first rest-swagger next and global configuration last. If set overrides any value found in the Swagger specification RestConfiguration. Can be overriden in endpoint configuration.

produces

null

What payload type this component is producing. For example application/json according to the RFC7231. This equates to the value of Content-Type HTTP header. If set overrides any value present in the Swagger specification. Can be overriden in endpoint configuration.

specificationUri

"swagger.json"

Path to the Swagger specification file. The scheme host base path are taken from this specification but these can be overriden with properties on the component or endpoint level. If not given the component tries to load swagger.json resource. Can be overriden in endpoint configuration.

operationId

 

Endpoint only, the ID of the operation from the Swagger specification.

Example: PetStore

Checkout the example in the camel-example-rest-swagger project in the examples directory.

For example if you wanted to use the PetStore provided REST API simply reference the specification URI and desired operation id from the Swagger specification or download the specification and store it as swagger.json (in the root) of CLASSPATH that way it will be automaticaly used. Let’s use the Undertow component to perform all the requests and Camels excelent support for Spring Boot.

Here are our dependencies defined in Maven POM file:

Start by defining the Undertow component and the RestSwaggerComponent:

NOTE: Support in Camel for Spring Boot will auto create the UndertowComponent Spring bean, and you can configure it using application.properties (or application.yml) using prefix camel.component.undertow.. We are defining the petstore component here in order to have a named component in the Camel context that we can use to interact with the PetStore REST API, if this is the only rest-swagger component used we might configure it in the same manner (using application.properties).

Now in our application we can simply use the ProducerTemplate to invoke PetStore REST methods:

 

 

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