How to Add an API v1 Route
Write SPARQL templates
Add any SPARQL templates you need to src/main/twirl/queries/sparql/v1,
using the Twirl template
engine.
Write Responder Request and Response Messages
Add a file to the org.knora.webapi.messages.v2.responder
package, containing case classes for your responder's request and
response messages. Add a trait that the responder's request messages
extend. Each request message type should contain a UserADM.
Response message classes that represent a complete API response must
extend KnoraResponseV1, and must therefore have a toJsValue method
that converts the response message to a JSON AST using
spray-json.
Write a Responder
Write a class that extends org.knora.webapi.responders.Responder,
and add it to the org.knora.webapi.responders.v1 package.
Give your responder a receive(msg: YourCustomType) method that handles each of your
request message types by generating a Future containing a response message.
Add the path of your responder to the org.knora.webapi.responders package object,
and add code to ResponderManager to instantiate an object for your responder class.
Then add a case to the receive method in ResponderManager, to match
messages that extend your request message trait, and pass them to the responder's
receive method. The responder's resulting Future must be passed to the ActorUtil.future2Message.
See Futures with Akka and
Error Handling for details.
Write a Route
Add a class to the org.knora.webapi.routing.v1 package for your
route, using the Akka HTTP Routing DSL.
See the routes in that package for examples. Typically, each route
route will construct a responder request message and pass it to
RouteUtilV1.runRdfRouteWithFuture to handle the request.
Finally, add your knoraApiPath function to the apiRoutes member
variable in KnoraService. Any exception thrown inside the route will
be handled by the KnoraExceptionHandler, so that the correct client
response (including the HTTP status code) will be returned.