--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/server/auth/UserClient.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,158 @@
+package org.dive4elements.river.client.server.auth;
+
+import javax.xml.xpath.XPathConstants;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+
+import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
+import org.dive4elements.artifacts.httpclient.http.HttpClient;
+import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
+
+/**
+ * UserClient is a class to allow easier communication
+ * with the REST based artifact user protocol
+ */
+public class UserClient {
+
+    private static final Logger logger = Logger.getLogger(UserClient.class);
+
+    private String url;
+
+    public UserClient(String url) {
+        this.url = url;
+    }
+
+    public boolean userExists(User user) throws ConnectionException {
+        if (user == null) {
+            return false;
+        }
+
+        Element data = this.findUser(user);
+
+        String XPATH_USERACCOUNT = "/art:user/art:account/@art:name";
+
+        String account = XMLUtils.xpathString(
+            data, XPATH_USERACCOUNT, ArtifactNamespaceContext.INSTANCE);
+
+        if (account == null) {
+            return false;
+        }
+
+        return account.equals(user.getAccount());
+    }
+
+    public boolean createUser(User user) throws ConnectionException {
+        if(user == null) {
+            logger.warn("createUser: given user is null");
+            return false;
+        }
+
+        logger.debug("Creating new user " + user.getName());
+        HttpClient client = new HttpClientImpl(this.url);
+
+        Document document = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
+            document,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX
+        );
+
+        Element action = creator.create("action");
+
+        Element type = creator.create("type");
+        type.setAttribute("name", "create");
+        Element artuser = creator.create("user");
+        artuser.setAttribute("name", user.getName());
+        Element account = creator.create("account");
+        account.setAttribute("name", user.getAccount());
+
+        //TODO create roles
+        artuser.appendChild(account);
+        action.appendChild(type);
+        action.appendChild(artuser);
+        document.appendChild(action);
+
+        logger.debug("Create user request xml: " + XMLUtils.toString(document));
+
+        Document resp = client.createUser(document);
+
+        logger.debug("Create user response xml: " + XMLUtils.toString(resp));
+
+        String XPATH_RESPONSE = "/art:result";
+        Node nresult = (Node) XMLUtils.xpath(
+            resp,
+            XPATH_RESPONSE,
+            XPathConstants.NODE,
+            ArtifactNamespaceContext.INSTANCE);
+        String result = nresult.getTextContent();
+        return (result != null && result.equalsIgnoreCase("success"));
+    }
+
+    public NodeList listUsers() throws ConnectionException {
+        HttpClient client = new HttpClientImpl(this.url);
+
+        Document users = (Document) client.listUsers();
+
+        String XPATH_USERS = "/art:users/art:user";
+
+        return (NodeList) XMLUtils.xpath(
+            users,
+            XPATH_USERS,
+            XPathConstants.NODESET,
+            ArtifactNamespaceContext.INSTANCE);
+    }
+
+    public Element findUser(User user) throws ConnectionException {
+        if(user == null) {
+            throw new IllegalArgumentException("user is null");
+        }
+
+        HttpClient client = new HttpClientImpl(this.url);
+
+        Document document = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
+            document,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX
+        );
+
+        Element action = creator.create("action");
+
+        Element type = creator.create("type");
+        type.setAttribute("name", "find");
+        Element account = creator.create("account");
+        account.setAttribute("name", user.getAccount());
+
+        action.appendChild(type);
+        action.appendChild(account);
+        document.appendChild(action);
+
+        boolean debug = logger.isDebugEnabled();
+
+        if (debug) {
+            logger.debug("Find user request xml: " +
+                XMLUtils.toString(document));
+        }
+
+        Document resp = client.findUser(document);
+
+        if (debug) {
+            logger.debug("Find user request response xml: " +
+                XMLUtils.toString(resp));
+        }
+
+        return resp.getDocumentElement();
+    }
+}
+// vim: set si et fileencoding=utf-8 ts=4 sw=4 tw=80:
+