For destination path without filename information use source file name

 * Uses filename from nexus redirect location header

refs #10

src/main/groovy/com/simplifyops/rundeck/plugin/nexus/NexusDeliverArtifactStepPlugin.groovy

@@ -97,7 +97,10 @@ public class NexusDeliverArtifactStepPlugin implements StepPlugin {
 
         String customDestinationPath = destinationPath;
         if (destinationPath.endsWith("/")) {
-            customDestinationPath = customDestinationPath + tempFile.getName();
+
+            def originalFileName = NexusHttpRequestHandler.resolveArtifactFileName(nexus, nexusUser, nexusPassword, query)
+
+            customDestinationPath = customDestinationPath + (originalFileName ? originalFileName : tempFile.getName());
         }
         context.getNodes().each { node ->
             def nodedata = DataContextUtils.nodeData(node)

src/main/groovy/com/simplifyops/rundeck/plugin/nexus/NexusHttpRequestHandler.groovy

@@ -6,7 +6,8 @@ import groovyx.net.http.HTTPBuilder
 import groovyx.net.http.Method
 import groovyx.net.http.URIBuilder
 import groovyx.net.http.ContentType
-
+import org.apache.http.impl.client.AbstractHttpClient
+import org.apache.http.params.BasicHttpParams
 
 class NexusHttpRequestHandler {
 
@@ -16,9 +17,51 @@ class NexusHttpRequestHandler {
         FileNotFound, UnexepectedFailure
     }
 
+    static resolveArtifactFileName(host, user, password, query) {
+
+        def redirectLocation
+        def uri = buildUri(host, query)
+
+        def http = new HTTPBuilder(uri)
+
+        AbstractHttpClient ahc = http.client
+        BasicHttpParams params = new BasicHttpParams();
+        params.setParameter("http.protocol.handle-redirects",false)
+        ahc.setParams(params)
+
+        if (user && password) {
+            http.auth.basic user, password
+        }
+
+        http.request( Method.GET, ContentType.ANY ) {
+
+            response.'307' = { rsp ->
+                redirectLocation = rsp.headers?.Location
+            }
+
+            response.failure = { resp ->
+                throw new StepException("Status code: ${resp.status}. Uri: ${uri}", Reason.UnexepectedFailure)
+            }
+
+            response.'404' = { resp ->
+                throw new StepException("Artifact not found in matching query: ${uri}", Reason.FileNotFound)
+            }
+        }
+
+        if (redirectLocation) {
+            def fileName = redirectLocation.substring(redirectLocation.lastIndexOf("/") + 1)
+            println "Nexus artifact filename: ${fileName}"
+
+            return fileName
+        }
+
+        throw new StepException("Location Header was not set for given uri: ${uri}", Reason.UnexepectedFailure)
+
+    }
+
     static handleRequest(host, user, password, query, successHandler) {
 
-        def uri = new URIBuilder(host + REDIRECT_URL).setQuery(query);
+        def uri = buildUri(host, query)
 
         println "Nexus request URL: ${uri}"
 
@@ -42,6 +85,10 @@ class NexusHttpRequestHandler {
         }
     }
 
+    static buildUri (host, query) {
+        return new URIBuilder(host + REDIRECT_URL).setQuery(query)
+    }
+
     static buildQuery(group , artifact, version, repo, packaging, classifier) {
 
         def query = [g: group, a: artifact, v: version, r: repo, p: packaging]