Resolve "auto notification about new release"

Closes #961 (closed)

frontend-js/src/main/js/Admin.js

@@ -16,7 +16,11 @@ var UsersAdminPanel = require('./gui/admin/UsersAdminPanel');
 
 // noinspection JSUnusedLocalSymbols
 var logger = require('./logger');
+var request = require('request');
+var semver = require('semver');
 var GuiUtils = require('./gui/leftPanel/GuiUtils');
+var NetworkError = require('./NetworkError');
+var GuiConnector = require('./GuiConnector');
 
 /**
  * Default constructor.
@@ -110,12 +114,15 @@ Admin.prototype.getElement = function () {
  * @returns {Promise}
  */
 Admin.prototype.init = function () {
+  var self = this;
   var promises = [];
-  for (var i = 0; i < this._panels.length; i++) {
-    promises.push(this._panels[i].init());
+  for (var i = 0; i < self._panels.length; i++) {
+    promises.push(self._panels[i].init());
   }
   return Promise.all(promises).then(function () {
     $(window).trigger('resize');
+  }).then(function () {
+    return self.checkAvailableVersion();
   });
 };
 
@@ -148,6 +155,64 @@ Admin.prototype.destroy = function () {
   return Promise.all(promises);
 };
 
+/**
+ *
+ * @return {Promise<T>}
+ */
+Admin.prototype.checkAvailableVersion = function () {
+  var self = this;
+
+  var localVersion = semver.coerce(self.getConfiguration().getVersion());
+  return self.getLatestPublishedVersion().then(function (publishedVersion) {
+    if (semver.gt(publishedVersion, localVersion) > 0) {
+      GuiConnector.warn("New minerva version (" + publishedVersion + ") was released. Please upgrade your minerva instance or contact system administrator to do so.");
+    }
+  });
+};
+
+/**
+ *
+ * @return {Promise}
+ */
+Admin.prototype.getLatestPublishedVersion = function () {
+  return new Promise(function (resolve, reject) {
+    var url = "https://minerva-net.lcsb.uni.lu/proxy/?url=https://webdav-r3lab.uni.lu/public/minerva/";
+    request(url, function (error, response, body) {
+      if (error) {
+        reject(new NetworkError(error.message, {
+          content: body,
+          url: url
+        }));
+      } else if (response.statusCode !== 200) {
+        reject(new NetworkError(url + " rejected with status code: " + response.statusCode, {
+          content: body,
+          url: url,
+          statusCode: response.statusCode
+        }));
+      } else {
+        var content;
+        // for some reason sometimes result is an object not a string
+        if (typeof body === 'string' || body instanceof String) {
+          content = body;
+        } else {
+          content = JSON.stringify(body);
+        }
+        var re = /href="[\w.]+/g;
+        var result = content.match(re);
+        for (var i = result.length - 1; i >= 0; i--) {
+          result[i] = result[i].replace("href=\"", "");
+          if (!semver.valid(result[i])) {
+            logger.warn("Invalid version: " + result[i]);
+            result.splice(i, 1);
+          }
+        }
+        result.sort(semver.compare);
+        resolve(result[result.length - 1]);
+      }
+    });
+  });
+};
+
 /**
  *
  * @param {ServerConnector} serverConnector