Implement computed attributes

15 files changed, 876 insertions, 4 deletions

diff --git a/src/org/traccar/BasePipelineFactory.java b/src/org/traccar/BasePipelineFactory.java
index 620c4729a..11457905d 100644
--- a/src/org/traccar/BasePipelineFactory.java
+++ b/src/org/traccar/BasePipelineFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2017 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,6 +38,8 @@ import org.traccar.events.MotionEventHandler;
 import org.traccar.events.OverspeedEventHandler;
 import org.traccar.events.AlertEventHandler;
 import org.traccar.helper.Log;
+import org.traccar.processing.ComputedAttributesHandler;
+import org.traccar.processing.CopyAttributesHandler;
 
 import java.net.InetSocketAddress;
 
@@ -53,6 +55,7 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
     private GeolocationHandler geolocationHandler;
     private HemisphereHandler hemisphereHandler;
     private CopyAttributesHandler copyAttributesHandler;
+    private ComputedAttributesHandler computedAttributesHandler;
 
     private CommandResultEventHandler commandResultEventHandler;
     private OverspeedEventHandler overspeedEventHandler;
@@ -153,6 +156,10 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
             copyAttributesHandler = new CopyAttributesHandler();
         }
 
+        if (Context.getConfig().getBoolean("processing.computedAttributes.enable")) {
+            computedAttributesHandler = new ComputedAttributesHandler();
+        }
+
         if (Context.getConfig().getBoolean("event.enable")) {
             commandResultEventHandler = new CommandResultEventHandler();
             overspeedEventHandler = new OverspeedEventHandler();
@@ -209,6 +216,10 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory {
             pipeline.addLast("copyAttributes", copyAttributesHandler);
         }
 
+        if (computedAttributesHandler != null) {
+            pipeline.addLast("computedAttributes", computedAttributesHandler);
+        }
+
         if (Context.getDataManager() != null) {
             pipeline.addLast("dataHandler", new DefaultDataHandler());
         }
diff --git a/src/org/traccar/Context.java b/src/org/traccar/Context.java
index bfef3807b..07ede4cad 100644
--- a/src/org/traccar/Context.java
+++ b/src/org/traccar/Context.java
@@ -27,6 +27,7 @@ import org.apache.velocity.app.VelocityEngine;
 import org.eclipse.jetty.util.URIUtil;
 import org.traccar.database.AliasesManager;
 import org.traccar.database.CalendarManager;
+import org.traccar.database.AttributesManager;
 import org.traccar.database.ConnectionManager;
 import org.traccar.database.DataManager;
 import org.traccar.database.DeviceManager;
@@ -173,6 +174,12 @@ public final class Context {
         return aliasesManager;
     }
 
+    private static AttributesManager attributesManager;
+
+    public static AttributesManager getAttributesManager() {
+        return attributesManager;
+    }
+
     private static StatisticsManager statisticsManager;
 
     public static StatisticsManager getStatisticsManager() {
@@ -310,6 +317,8 @@ public final class Context {
 
         aliasesManager = new AliasesManager(dataManager);
 
+        attributesManager = new AttributesManager(dataManager);
+
         statisticsManager = new StatisticsManager();
 
         if (config.getBoolean("sms.smpp.enable")) {
diff --git a/src/org/traccar/api/resource/AttributePermissionResource.java b/src/org/traccar/api/resource/AttributePermissionResource.java
new file mode 100644
index 000000000..1924bcdf1
--- /dev/null
+++ b/src/org/traccar/api/resource/AttributePermissionResource.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.api.resource;
+
+import java.sql.SQLException;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+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 org.traccar.Context;
+import org.traccar.api.BaseResource;
+import org.traccar.model.AttributePermission;
+
+@Path("permissions/attributes")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class AttributePermissionResource extends BaseResource {
+
+    @POST
+    public Response add(AttributePermission entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
+        Context.getDataManager().linkAttribute(entity.getUserId(), entity.getAttributeId());
+        Context.getAttributesManager().refreshUserAttributes();
+        return Response.ok(entity).build();
+    }
+
+    @DELETE
+    public Response remove(AttributePermission entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkUser(getUserId(), entity.getUserId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
+        Context.getDataManager().unlinkAttribute(entity.getUserId(), entity.getAttributeId());
+        Context.getAttributesManager().refreshUserAttributes();
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/api/resource/AttributeResource.java b/src/org/traccar/api/resource/AttributeResource.java
new file mode 100644
index 000000000..7751a9360
--- /dev/null
+++ b/src/org/traccar/api/resource/AttributeResource.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.api.resource;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+import org.traccar.Context;
+import org.traccar.api.BaseResource;
+import org.traccar.database.AttributesManager;
+import org.traccar.model.Attribute;
+
+@Path("attributes/computed")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class AttributeResource extends BaseResource {
+
+    @GET
+    public Collection<Attribute> get(
+            @QueryParam("all") boolean all, @QueryParam("userId") long userId, @QueryParam("groupId") long groupId,
+            @QueryParam("deviceId") long deviceId, @QueryParam("refresh") boolean refresh) throws SQLException {
+
+        AttributesManager attributesManager = Context.getAttributesManager();
+        if (refresh) {
+            attributesManager.refreshAttributes();
+        }
+
+        Set<Long> result = new HashSet<>();
+        if (all) {
+            if (Context.getPermissionsManager().isAdmin(getUserId())) {
+                result.addAll(attributesManager.getAllAttributes());
+            } else {
+                Context.getPermissionsManager().checkManager(getUserId());
+                result.addAll(attributesManager.getManagedAttributes(getUserId()));
+            }
+        } else {
+            if (userId == 0) {
+                userId = getUserId();
+            }
+            Context.getPermissionsManager().checkUser(getUserId(), userId);
+            result.addAll(attributesManager.getUserAttributes(userId));
+        }
+
+        if (groupId != 0) {
+            Context.getPermissionsManager().checkGroup(getUserId(), groupId);
+            result.retainAll(attributesManager.getGroupAttributes(groupId));
+        }
+
+        if (deviceId != 0) {
+            Context.getPermissionsManager().checkDevice(getUserId(), deviceId);
+            result.retainAll(attributesManager.getDeviceAttributes(deviceId));
+        }
+        return attributesManager.getAttributes(result);
+
+    }
+    @POST
+    public Response add(Attribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getAttributesManager().addAttribute(entity);
+        Context.getDataManager().linkAttribute(getUserId(), entity.getId());
+        Context.getAttributesManager().refreshUserAttributes();
+        return Response.ok(entity).build();
+    }
+
+    @Path("{id}")
+    @PUT
+    public Response update(Attribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getId());
+        Context.getAttributesManager().updateAttribute(entity);
+        return Response.ok(entity).build();
+    }
+
+    @Path("{id}")
+    @DELETE
+    public Response remove(@PathParam("id") long id) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), id);
+        Context.getAttributesManager().removeAttribute(id);
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/api/resource/DeviceAttributeResource.java b/src/org/traccar/api/resource/DeviceAttributeResource.java
new file mode 100644
index 000000000..8d80c9235
--- /dev/null
+++ b/src/org/traccar/api/resource/DeviceAttributeResource.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.api.resource;
+
+import java.sql.SQLException;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+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 org.traccar.Context;
+import org.traccar.api.BaseResource;
+import org.traccar.model.DeviceAttribute;
+
+@Path("devices/attributes")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class DeviceAttributeResource extends BaseResource {
+
+    @POST
+    public Response add(DeviceAttribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
+        Context.getDataManager().linkDeviceAttribute(entity.getDeviceId(), entity.getAttributeId());
+        Context.getAttributesManager().refresh();
+        return Response.ok(entity).build();
+    }
+
+    @DELETE
+    public Response remove(DeviceAttribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkDevice(getUserId(), entity.getDeviceId());
+        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getAttributeId());
+        Context.getDataManager().unlinkDeviceAttribute(entity.getDeviceId(), entity.getAttributeId());
+        Context.getAttributesManager().refresh();
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/api/resource/GroupAttributeResource.java b/src/org/traccar/api/resource/GroupAttributeResource.java
new file mode 100644
index 000000000..84b876d34
--- /dev/null
+++ b/src/org/traccar/api/resource/GroupAttributeResource.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.api.resource;
+
+import java.sql.SQLException;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+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 org.traccar.Context;
+import org.traccar.api.BaseResource;
+import org.traccar.model.GroupAttribute;
+
+@Path("groups/attributes")
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class GroupAttributeResource extends BaseResource {
+
+    @POST
+    public Response add(GroupAttribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
+        Context.getPermissionsManager().checkAttribute(getUserId(), entity.getAttributeId());
+        Context.getDataManager().linkGroupAttribute(entity.getGroupId(), entity.getAttributeId());
+        Context.getAttributesManager().refresh();
+        return Response.ok(entity).build();
+    }
+
+    @DELETE
+    public Response remove(GroupAttribute entity) throws SQLException {
+        Context.getPermissionsManager().checkReadonly(getUserId());
+        Context.getPermissionsManager().checkGroup(getUserId(), entity.getGroupId());
+        Context.getPermissionsManager().checkGeofence(getUserId(), entity.getAttributeId());
+        Context.getDataManager().unlinkGroupAttribute(entity.getGroupId(), entity.getAttributeId());
+        Context.getAttributesManager().refresh();
+        return Response.noContent().build();
+    }
+
+}
diff --git a/src/org/traccar/database/AttributesManager.java b/src/org/traccar/database/AttributesManager.java
new file mode 100644
index 000000000..362d6130f
--- /dev/null
+++ b/src/org/traccar/database/AttributesManager.java
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.database;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.AttributePermission;
+import org.traccar.model.Attribute;
+import org.traccar.model.Device;
+import org.traccar.model.DeviceAttribute;
+import org.traccar.model.GroupAttribute;
+
+public class AttributesManager {
+
+    private final DataManager dataManager;
+
+    private final Map<Long, Attribute> attributes = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> deviceAttributes = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> deviceAttributesWithGroups = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> groupAttributes = new ConcurrentHashMap<>();
+    private final Map<Long, Set<Long>> userAttributes = new ConcurrentHashMap<>();
+
+    public AttributesManager(DataManager dataManager) {
+        this.dataManager = dataManager;
+        refreshAttributes();
+    }
+
+    public Set<Long> getUserAttributes(long userId) {
+        if (!userAttributes.containsKey(userId)) {
+            userAttributes.put(userId, new HashSet<Long>());
+        }
+        return userAttributes.get(userId);
+    }
+
+    public Set<Long> getGroupAttributes(long groupId) {
+        if (!groupAttributes.containsKey(groupId)) {
+            groupAttributes.put(groupId, new HashSet<Long>());
+        }
+        return groupAttributes.get(groupId);
+    }
+
+    public Set<Long> getDeviceAttributes(long deviceId) {
+        return getDeviceAttributes(deviceAttributes, deviceId);
+    }
+
+    public Set<Long> getAllDeviceAttributes(long deviceId) {
+        return getDeviceAttributes(deviceAttributesWithGroups, deviceId);
+    }
+
+    private Set<Long> getDeviceAttributes(Map<Long, Set<Long>> deviceAttributes, long deviceId) {
+        if (!deviceAttributes.containsKey(deviceId)) {
+            deviceAttributes.put(deviceId, new HashSet<Long>());
+        }
+        return deviceAttributes.get(deviceId);
+    }
+
+    public final void refreshAttributes() {
+        if (dataManager != null) {
+            try {
+                attributes.clear();
+                for (Attribute attribute : dataManager.getAttributes()) {
+                    attributes.put(attribute.getId(), attribute);
+                }
+            } catch (SQLException error) {
+                Log.warning(error);
+            }
+        }
+        refreshUserAttributes();
+        refresh();
+    }
+
+    public final void refreshUserAttributes() {
+        if (dataManager != null) {
+            try {
+                userAttributes.clear();
+                for (AttributePermission attributePermission : dataManager.getAttributePermissions()) {
+                    getUserAttributes(attributePermission.getUserId()).add(attributePermission.getAttributeId());
+                }
+            } catch (SQLException error) {
+                Log.warning(error);
+            }
+        }
+    }
+
+    public final void refresh() {
+        if (dataManager != null) {
+            try {
+
+                Collection<GroupAttribute> databaseGroupAttributes = dataManager.getGroupAttributes();
+
+                groupAttributes.clear();
+                for (GroupAttribute groupAttribute : databaseGroupAttributes) {
+                    getGroupAttributes(groupAttribute.getGroupId()).add(groupAttribute.getAttributeId());
+                }
+
+                Collection<DeviceAttribute> databaseDeviceAttributes = dataManager.getDeviceAttributes();
+                Collection<Device> allDevices = Context.getDeviceManager().getAllDevices();
+
+                deviceAttributes.clear();
+                deviceAttributesWithGroups.clear();
+
+                for (DeviceAttribute deviceAttribute : databaseDeviceAttributes) {
+                    getDeviceAttributes(deviceAttribute.getDeviceId())
+                        .add(deviceAttribute.getAttributeId());
+                    getAllDeviceAttributes(deviceAttribute.getDeviceId())
+                        .add(deviceAttribute.getAttributeId());
+                }
+
+                for (Device device : allDevices) {
+                    long groupId = device.getGroupId();
+                    while (groupId != 0) {
+                        getAllDeviceAttributes(device.getId()).addAll(getGroupAttributes(groupId));
+                        if (Context.getDeviceManager().getGroupById(groupId) != null) {
+                            groupId = Context.getDeviceManager().getGroupById(groupId).getGroupId();
+                        } else {
+                            groupId = 0;
+                        }
+                    }
+                }
+
+            } catch (SQLException error) {
+                Log.warning(error);
+            }
+        }
+    }
+
+    public void addAttribute(Attribute attribute) throws SQLException {
+        dataManager.addAttribute(attribute);
+        attributes.put(attribute.getId(), attribute);
+    }
+
+    public void updateAttribute(Attribute attribute) throws SQLException {
+        dataManager.updateAttribute(attribute);
+        Attribute cachedAttribute = attributes.get(attribute.getId());
+        cachedAttribute.setDescription(attribute.getDescription());
+        cachedAttribute.setAttribute(attribute.getAttribute());
+        cachedAttribute.setExpression(attribute.getExpression());
+        cachedAttribute.setType(attribute.getType());
+    }
+
+    public void removeAttribute(long computedAttributeId) throws SQLException {
+        dataManager.removeAttribute(computedAttributeId);
+        attributes.remove(computedAttributeId);
+        refreshUserAttributes();
+        refresh();
+    }
+
+    public boolean checkAttribute(long userId, long attributeId) {
+        return getUserAttributes(userId).contains(attributeId);
+    }
+
+    public Attribute getAttribute(long id) {
+        return attributes.get(id);
+    }
+
+    public final Collection<Attribute> getAttributes(Set<Long> attributeIds) {
+        Collection<Attribute> result = new LinkedList<>();
+        for (long attributeId : attributeIds) {
+            result.add(getAttribute(attributeId));
+        }
+        return result;
+    }
+
+    public final Set<Long> getAllAttributes() {
+        return attributes.keySet();
+    }
+
+    public final Set<Long> getManagedAttributes(long userId) {
+        Set<Long> attributes = new HashSet<>();
+        attributes.addAll(getUserAttributes(userId));
+        for (long managedUserId : Context.getPermissionsManager().getUserPermissions(userId)) {
+            attributes.addAll(getUserAttributes(managedUserId));
+        }
+        return attributes;
+    }
+
+}
diff --git a/src/org/traccar/database/DataManager.java b/src/org/traccar/database/DataManager.java
index 0c5f458a2..acbaac17b 100644
--- a/src/org/traccar/database/DataManager.java
+++ b/src/org/traccar/database/DataManager.java
@@ -37,13 +37,17 @@ import liquibase.resource.ResourceAccessor;
 import org.traccar.Config;
 import org.traccar.helper.Log;
 import org.traccar.model.AttributeAlias;
+import org.traccar.model.AttributePermission;
 import org.traccar.model.Calendar;
 import org.traccar.model.CalendarPermission;
+import org.traccar.model.Attribute;
 import org.traccar.model.Device;
+import org.traccar.model.DeviceAttribute;
 import org.traccar.model.DevicePermission;
 import org.traccar.model.Event;
 import org.traccar.model.Geofence;
 import org.traccar.model.Group;
+import org.traccar.model.GroupAttribute;
 import org.traccar.model.GroupGeofence;
 import org.traccar.model.GroupPermission;
 import org.traccar.model.Notification;
@@ -548,4 +552,84 @@ public class DataManager {
                 .executeUpdate();
     }
 
+    public Collection<Attribute> getAttributes() throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery("database.selectAttributes"))
+                .executeQuery(Attribute.class);
+    }
+
+    public void addAttribute(Attribute attribute) throws SQLException {
+        attribute.setId(QueryBuilder.create(dataSource, getQuery("database.insertAttribute"), true)
+                .setObject(attribute)
+                .executeUpdate());
+    }
+
+    public void updateAttribute(Attribute attribute) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.updateAttribute"))
+                .setObject(attribute)
+                .executeUpdate();
+    }
+
+    public void removeAttribute(long computedAttributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.deleteAttribute"))
+                .setLong("id", computedAttributeId)
+                .executeUpdate();
+    }
+
+    public Collection<AttributePermission> getAttributePermissions() throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery("database.selectAttributePermissions"))
+                .executeQuery(AttributePermission.class);
+    }
+
+    public void linkAttribute(long userId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.linkAttribute"))
+                .setLong("userId", userId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
+    public void unlinkAttribute(long userId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.unlinkAttribute"))
+                .setLong("userId", userId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
+    public Collection<GroupAttribute> getGroupAttributes() throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery("database.selectGroupAttributes"))
+                .executeQuery(GroupAttribute.class);
+    }
+
+    public void linkGroupAttribute(long groupId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.linkGroupAttribute"))
+                .setLong("groupId", groupId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
+    public void unlinkGroupAttribute(long groupId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.unlinkGroupAttribute"))
+                .setLong("groupId", groupId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
+    public Collection<DeviceAttribute> getDeviceAttributes() throws SQLException {
+        return QueryBuilder.create(dataSource, getQuery("database.selectDeviceAttributes"))
+                .executeQuery(DeviceAttribute.class);
+    }
+
+    public void linkDeviceAttribute(long deviceId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.linkDeviceAttribute"))
+                .setLong("deviceId", deviceId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
+    public void unlinkDeviceAttribute(long deviceId, long attributeId) throws SQLException {
+        QueryBuilder.create(dataSource, getQuery("database.unlinkDeviceAttribute"))
+                .setLong("deviceId", deviceId)
+                .setLong("attributeId", attributeId)
+                .executeUpdate();
+    }
+
 }
diff --git a/src/org/traccar/database/PermissionsManager.java b/src/org/traccar/database/PermissionsManager.java
index e4bd6f5db..11f147c7c 100644
--- a/src/org/traccar/database/PermissionsManager.java
+++ b/src/org/traccar/database/PermissionsManager.java
@@ -310,6 +310,18 @@ public class PermissionsManager {
         }
     }
 
+    public void checkAttribute(long userId, long attributeId) throws SecurityException {
+        if (!Context.getAttributesManager().checkAttribute(userId, attributeId) && !isAdmin(userId)) {
+            checkManager(userId);
+            for (long managedUserId : getUserPermissions(userId)) {
+                if (Context.getAttributesManager().checkAttribute(managedUserId, attributeId)) {
+                    return;
+                }
+            }
+            throw new SecurityException("Attribute access denied");
+        }
+    }
+
     public void checkCalendar(long userId, long calendarId) throws SecurityException {
         if (!Context.getCalendarManager().checkCalendar(userId, calendarId) && !isAdmin(userId)) {
             checkManager(userId);
diff --git a/src/org/traccar/model/Attribute.java b/src/org/traccar/model/Attribute.java
new file mode 100644
index 000000000..9c3b5e43b
--- /dev/null
+++ b/src/org/traccar/model/Attribute.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.model;
+
+public class Attribute {
+
+    private long id;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    private String description;
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    private String attribute;
+
+    public String getAttribute() {
+        return attribute;
+    }
+
+    public void setAttribute(String attribute) {
+        this.attribute = attribute;
+    }
+
+    private String expression;
+
+    public String getExpression() {
+        return expression;
+    }
+
+    public void setExpression(String expression) {
+        this.expression = expression;
+    }
+
+    private String type;
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+}
diff --git a/src/org/traccar/model/AttributePermission.java b/src/org/traccar/model/AttributePermission.java
new file mode 100644
index 000000000..fe2fe7b6e
--- /dev/null
+++ b/src/org/traccar/model/AttributePermission.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.model;
+
+public class AttributePermission {
+
+    private long userId;
+
+    public long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(long userId) {
+        this.userId = userId;
+    }
+
+    private long attributeId;
+
+    public long getAttributeId() {
+        return attributeId;
+    }
+
+    public void setAttributeId(long attributeId) {
+        this.attributeId = attributeId;
+    }
+
+}
diff --git a/src/org/traccar/model/DeviceAttribute.java b/src/org/traccar/model/DeviceAttribute.java
new file mode 100644
index 000000000..e0ac6dd98
--- /dev/null
+++ b/src/org/traccar/model/DeviceAttribute.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.model;
+
+public class DeviceAttribute {
+
+    private long deviceId;
+
+    public long getDeviceId() {
+        return deviceId;
+    }
+
+    public void setDeviceId(long deviceId) {
+        this.deviceId = deviceId;
+    }
+
+    private long attributeId;
+
+    public long getAttributeId() {
+        return attributeId;
+    }
+
+    public void setAttributeId(long attributeId) {
+        this.attributeId = attributeId;
+    }
+}
diff --git a/src/org/traccar/model/GroupAttribute.java b/src/org/traccar/model/GroupAttribute.java
new file mode 100644
index 000000000..a7e8a80bc
--- /dev/null
+++ b/src/org/traccar/model/GroupAttribute.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.model;
+
+public class GroupAttribute {
+
+    private long groupId;
+
+    public long getGroupId() {
+        return groupId;
+    }
+
+    public void setGroupId(long groupId) {
+        this.groupId = groupId;
+    }
+
+    private long attributeId;
+
+    public long getAttributeId() {
+        return attributeId;
+    }
+
+    public void setAttributeId(long attributeId) {
+        this.attributeId = attributeId;
+    }
+}
diff --git a/src/org/traccar/processing/ComputedAttributesHandler.java b/src/org/traccar/processing/ComputedAttributesHandler.java
new file mode 100644
index 000000000..ea7c0aa1d
--- /dev/null
+++ b/src/org/traccar/processing/ComputedAttributesHandler.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * Licensed 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.traccar.processing;
+
+import java.util.Collection;
+
+import org.apache.commons.jexl2.JexlEngine;
+import org.apache.commons.jexl2.JexlException;
+import org.apache.commons.jexl2.MapContext;
+import org.traccar.BaseDataHandler;
+import org.traccar.Context;
+import org.traccar.helper.Log;
+import org.traccar.model.Attribute;
+import org.traccar.model.Position;
+
+public class ComputedAttributesHandler extends BaseDataHandler {
+
+    private JexlEngine engine;
+
+    public ComputedAttributesHandler() {
+        engine = new JexlEngine();
+        engine.setStrict(true);
+    }
+
+    public Object computeAttribute(Attribute attribute, Position position) throws JexlException {
+        MapContext expressionContext = new MapContext();
+        expressionContext.set("position", position);
+        return engine.createExpression(attribute.getExpression()).evaluate(expressionContext);
+    }
+
+    @Override
+    protected Position handlePosition(Position position) {
+        Collection<Attribute> attributes = Context.getAttributesManager().getAttributes(
+                Context.getAttributesManager().getAllDeviceAttributes(position.getDeviceId()));
+        for (Attribute attribute : attributes) {
+            if (attribute.getAttribute() != null) {
+                Object result = null;
+                try {
+                    result = computeAttribute(attribute, position);
+                } catch (JexlException error) {
+                    Log.warning(error);
+                }
+                if (result != null) {
+                    try {
+                        switch (attribute.getType()) {
+                            case "number":
+                                position.getAttributes().put(attribute.getAttribute(), (Number) result);
+                                break;
+                            case "boolean":
+                                position.getAttributes().put(attribute.getAttribute(), (Boolean) result);
+                                break;
+                            default:
+                                position.getAttributes().put(attribute.getAttribute(), result.toString());
+                        }
+                    } catch (ClassCastException error) {
+                        Log.warning(error);
+                    }
+                }
+            }
+        }
+        return position;
+    }
+
+}
diff --git a/src/org/traccar/CopyAttributesHandler.java b/src/org/traccar/processing/CopyAttributesHandler.java
index 18052d0ea..3a96ca98d 100644
--- a/src/org/traccar/CopyAttributesHandler.java
+++ b/src/org/traccar/processing/CopyAttributesHandler.java
@@ -1,6 +1,6 @@
 /*
- * Copyright 2016 Anton Tananaev (anton@traccar.org)
- * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Andrey Kunitsyn (andrey@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.traccar;
+package org.traccar.processing;
 
+import org.traccar.BaseDataHandler;
+import org.traccar.Context;
 import org.traccar.model.Position;
 
 public class CopyAttributesHandler extends BaseDataHandler {