dashboard: Add HTTP API to get the version the of the dashboard (#800)

sentinel-dashboard/pom.xml

@@ -175,6 +175,7 @@
         <resources>
             <resource>
                 <directory>src/main/resources</directory>
+                <filtering>true</filtering>
             </resource>
 
             <resource>

sentinel-dashboard/src/main/java/com/alibaba/csp/sentinel/dashboard/controller/VersionController.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * 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 com.alibaba.csp.sentinel.dashboard.controller;
+
+import com.alibaba.csp.sentinel.dashboard.domain.Result;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author hisenyuan
+ * @date 2019-05-30 10:47:50
+ */
+@RestController
+@RequestMapping(value = "/")
+public class VersionController {
+    @Value("${sentinel.dashboard.version:''}")
+    private String sentinelDashboardVersion;
+    private static String VERSION_PATTERN = "-";
+
+    @RequestMapping(value = "/getVersion")
+    public Result<String> getVersion() {
+        if (sentinelDashboardVersion != null) {
+            String res = sentinelDashboardVersion;
+            if (sentinelDashboardVersion.contains(VERSION_PATTERN)) {
+                res = sentinelDashboardVersion.substring(0, sentinelDashboardVersion.indexOf(VERSION_PATTERN));
+            }
+            return Result.ofSuccess(res);
+        } else {
+            return Result.ofFail(1, "getVersion failed");
+        }
+    }
+}

sentinel-dashboard/src/main/resources/application.properties

@@ -13,4 +13,7 @@ logging.pattern.file= %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %
 auth.filter.exclude-urls=/,/auth/login,/auth/logout,/registry/machine
 auth.filter.exclude-url-suffixes=htm,html,js,css,map,ico,ttf,woff,png
 auth.username=sentinel
-auth.password=sentinel
+auth.password=sentinel
+
+# get the project version for index
+sentinel.dashboard.version=${project.version}