DNS lookup strategy

src/main/groovy/io/kamax/mxisd/lookup/RootProvider.groovy

@@ -20,15 +20,13 @@
 
 package io.kamax.mxisd.lookup
 
-import groovy.json.JsonSlurper
 import io.kamax.mxisd.api.ThreePidType
 import org.springframework.stereotype.Component
 
 @Component
-class RootProvider implements ThreePidProvider {
+class RootProvider extends RemoteIdentityServerProvider {
 
     private List<String> roots = Arrays.asList("https://matrix.org", "https://vector.im")
-    private JsonSlurper json = new JsonSlurper()
 
     @Override
     int getPriority() {
@@ -38,13 +36,9 @@ class RootProvider implements ThreePidProvider {
     @Override
     Optional<?> find(ThreePidType type, String threePid) {
         for (String root : roots) {
-            HttpURLConnection rootSrvConn = (HttpURLConnection) new URL(
-                    "${root}/_matrix/identity/api/v1/lookup?medium=${type}&address=${threePid}"
-            ).openConnection()
-
-            def output = json.parseText(rootSrvConn.getInputStream().getText())
-            if (output['address'] != null) {
-                return Optional.of(output)
+            Optional<?> answer = find(root, type, threePid)
+            if (answer.isPresent()) {
+                return answer
             }
         }