Added a REST command to upload topology configuration.
diff --git a/web/api/src/main/java/org/onlab/onos/rest/ConfigResource.java b/web/api/src/main/java/org/onlab/onos/rest/ConfigResource.java
new file mode 100644
index 0000000..219abbd
--- /dev/null
+++ b/web/api/src/main/java/org/onlab/onos/rest/ConfigResource.java
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.onlab.onos.rest;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.onlab.onos.net.device.DeviceProviderRegistry;
+import org.onlab.onos.net.host.HostProviderRegistry;
+import org.onlab.onos.net.link.LinkProviderRegistry;
+import org.onlab.rest.BaseResource;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Resource that acts as an ancillary provider for uploading pre-configured
+ * devices, ports and links.
+ */
+@Path("config")
+public class ConfigResource extends BaseResource {
+
+    @POST
+    @Path("topology")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response topology(InputStream input) throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        JsonNode cfg = mapper.readTree(input);
+        new ConfigProvider(cfg, get(DeviceProviderRegistry.class),
+                           get(LinkProviderRegistry.class),
+                           get(HostProviderRegistry.class)).parse();
+        return Response.ok(mapper.createObjectNode().toString()).build();
+    }
+
+}