encodinggroovymultipartform-datarest-clienthttpbuilder

encoder function for multipart/form-data in groovy

I need to form a 'multipart/form-data' REST request with jpeg image and JSON file as the content.I am stuck with encoding the 'multipart/form-data' as a zip file.

Can someone tell me, how I can achieve this with groovy RESTClient? I could not find any documentation regarding this.

Solution

  • As it can be seen in the docs RESTClient extends HTTPBuilder. HTTPBuilder has a getEncoder method that can be used to add dedicated encoder (with type and method). See the following piece of code:

    import org.codehaus.groovy.runtime.MethodClosure
import javax.ws.rs.core.MediaType

//this part adds a special encoder    
def client = new RESTClient('some host')
client.encoder.putAt(MediaType.MULTIPART_FORM_DATA, new MethodClosure(this, 'encodeMultiPart'))

//here is the method for the encoder added above
HttpEntity encodeMultiPart(MultipartBody body) {
    MultipartEntityBuilder.create()
    .addBinaryBody(
        'file', 
        body.file, 
        ContentType.MULTIPART_FORM_DATA, 
        body.filename
    ).build()
}

//here's how MultipartBody class looks:
class MultipartBody {
   InputStream file
   String filename
}

    Now to create a multipart request You need to pass an instance of MultipartBody as a body argument to the request.