Revert "Removed getFieldTop logic"

This reverts commit d187f914da.

public/controllers/agent/agents-preview.js

@@ -73,6 +73,10 @@ export class AgentsPreviewController {
     this.versions = [];
     this.groups = [];
     this.nodes = [];
+    this.mostActiveAgent = {
+      name: '',
+      id: ''
+    };
 
     // Load URL params
     if (loc && loc.tab) {
@@ -151,13 +155,20 @@ export class AgentsPreviewController {
 
       const api = JSON.parse(this.appState.getCurrentAPI()).id;
       const clusterInfo = this.appState.getClusterInfo();
+      const firstUrlParam =
+        clusterInfo.status === 'enabled' ? 'cluster' : 'manager';
+      const secondUrlParam = clusterInfo[firstUrlParam];
 
-      const agentsUnique = await this.genericReq.request(
-        'GET',
-        '/api/agents-unique/' + api,
-        {}
-      );
+      const pattern = this.appState.getCurrentPattern();
 
+      const data = await Promise.all([
+        this.genericReq.request('GET', '/api/agents-unique/' + api, {}),
+        this.genericReq.request(
+          'GET',
+          `/elastic/top/${firstUrlParam}/${secondUrlParam}/agent.name/${pattern}`
+        )
+      ]);
+      const [agentsUnique, agentsTop] = data;
       const unique = agentsUnique.data.result;
 
       this.searchBarModel = {
@@ -193,6 +204,22 @@ export class AgentsPreviewController {
       this.agentsCountNeverConnected = unique.summary.agentsCountNeverConnected;
       this.agentsCountTotal = unique.summary.agentsCountTotal;
       this.agentsCoverity = unique.summary.agentsCoverity;
+
+      if (agentsTop.data.data === '') {
+        this.mostActiveAgent.name = this.appState.getClusterInfo().manager;
+        this.mostActiveAgent.id = '000';
+      } else {
+        this.mostActiveAgent.name = agentsTop.data.data;
+        const info = await this.genericReq.request(
+          'GET',
+          `/elastic/top/${firstUrlParam}/${secondUrlParam}/agent.id/${pattern}`
+        );
+        if (info.data.data === '' && this.mostActiveAgent.name !== '') {
+          this.mostActiveAgent.id = '000';
+        } else {
+          this.mostActiveAgent.id = info.data.data;
+        }
+      }
     } catch (error) {
       this.errorInit = this.errorHandler.handle(error, false, false, true);
     }

public/templates/agents-prev/agents-prev.html

@@ -106,6 +106,21 @@
                             -</p>
                     </div>
                 </div>
+                <div class="euiFlexItem euiFlexItem--flexGrowZero">
+
+                    <div class="euiStat">
+                        <div class="euiText euiText--small euiStat__description">
+                            <p>Most active agent</p>
+                        </div>
+                        <p ng-if="ctrl.lastAgent && ctrl.lastAgent.id && ctrl.mostActiveAgent.id !== '000'"
+                            ng-click="ctrl.showAgent(ctrl.mostActiveAgent)"
+                            class="euiTitle euiTitle--small euiStat__title wz-text-link cursor-pointer">
+                            {{ctrl.mostActiveAgent.name}}</p>
+                        <p ng-if="!ctrl.lastAgent || !ctrl.lastAgent.id"
+                            class="euiTitle euiTitle--small euiStat__title">
+                            -</p>
+                    </div>
+                </div>
             </div>
         </div>
     </div>

server/controllers/wazuh-elastic.js

@@ -192,6 +192,70 @@ export class WazuhElasticCtrl {
     }
   }
 
+  /**
+   * This get the fields keys
+   * @param {Object} req
+   * @param {Object} reply
+   * @returns {Array<Object>} fields or ErrorResponse
+   */
+  async getFieldTop(req, reply) {
+    try {
+      // Top field payload
+      let payload = {
+        size: 1,
+        query: {
+          bool: {
+            must: [],
+            must_not: {
+              term: {
+                'agent.id': '000'
+              }
+            },
+            filter: { range: { timestamp: {} } }
+          }
+        },
+        aggs: {
+          '2': {
+            terms: {
+              field: '',
+              size: 1,
+              order: { _count: 'desc' }
+            }
+          }
+        }
+      };
+
+      // Set up time interval, default to Last 24h
+      const timeGTE = 'now-1d';
+      const timeLT = 'now';
+      payload.query.bool.filter.range['timestamp']['gte'] = timeGTE;
+      payload.query.bool.filter.range['timestamp']['lt'] = timeLT;
+
+      // Set up match for default cluster name
+      payload.query.bool.must.push(
+        req.params.mode === 'cluster'
+          ? { match: { 'cluster.name': req.params.cluster } }
+          : { match: { 'manager.name': req.params.cluster } }
+      );
+
+      payload.aggs['2'].terms.field = req.params.field;
+      payload.pattern = req.params.pattern;
+
+      const data = await this.wzWrapper.searchWazuhAlertsWithPayload(payload);
+
+      return data.hits.total.value === 0 ||
+        typeof data.aggregations['2'].buckets[0] === 'undefined'
+        ? { statusCode: 200, data: '' }
+        : {
+            statusCode: 200,
+            data: data.aggregations['2'].buckets[0].key
+          };
+    } catch (error) {
+      log('wazuh-elastic:getFieldTop', error.message || error);
+      return ErrorResponse(error.message || error, 4004, 500, reply);
+    }
+  }
+
   /**
    * This get the elastic setup settings
    * @param {Object} req

server/routes/wazuh-elastic.js

@@ -66,6 +66,15 @@ export function WazuhElasticRouter(server) {
     }
   });
 
+  // Returns the agent with most alerts
+  server.route({
+    method: 'GET',
+    path: '/elastic/top/{mode}/{cluster}/{field}/{pattern}',
+    handler(req, res) {
+      return ctrl.getFieldTop(req, res);
+    }
+  });
+
   // Return Wazuh Appsetup info
   server.route({
     method: 'GET',

test/server/wazuh-elastic.js

@@ -100,6 +100,10 @@ describe('wazuh-elastic', () => {
     });
   });
 
+  /*it('GET /elastic/top/{mode}/{cluster}/{field}/{pattern}', async () => {
+        throw Error('Test not implemented...')
+    })*/
+
   describe('Checking .wazuh-version index', () => {
     it('GET /elastic/setup', async () => {
       const res = await needle(