Added suport for timefilter/min/max in Vega urls (#124077)

docs/user/dashboard/vega-reference.asciidoc

@@ -351,6 +351,8 @@ a configuration option for changing the tooltip position and padding:
 *Vega* can load data from any URL. To enable, set `vis_type_vega.enableExternalUrls: true` in `kibana.yml`,
 then restart {kib}.
 
+You can make the current time range part of the external as a millisecond timestamp by using the placeholders `%timefilter_min%` and `%timefilter_max%`, e.g. `http://example.com?min=%timefilter_min%`.
+
 [float]
 [[vega-inspector]]
 ====== Vega Inspector

src/plugins/vis_types/vega/public/data_model/vega_parser.test.js

@@ -8,6 +8,7 @@
 import { cloneDeep } from 'lodash';
 import 'jest-canvas-mock';
 import { euiThemeVars } from '@kbn/ui-theme';
+import { TimeCache } from './time_cache';
 import { VegaParser } from './vega_parser';
 import { bypassExternalUrlCheck } from '../vega_view/vega_base_view';
 
@@ -226,7 +227,12 @@ describe('VegaParser._resolveEsQueries', () => {
           },
         };
       };
-      const vp = new VegaParser(spec, searchApiStub, 0, 0, mockGetServiceSettings);
+      const tc = new (class extends TimeCache {
+        getTimeBounds() {
+          return { min: 123456, max: 654321 };
+        }
+      })();
+      const vp = new VegaParser(spec, searchApiStub, tc, 0, mockGetServiceSettings);
       await vp._resolveDataUrls();
 
       expect(vp.spec).toEqual(expected);
@@ -265,6 +271,20 @@ describe('VegaParser._resolveEsQueries', () => {
       { data: { url: bypassExternalUrlCheck('url1') } }
     )
   );
+  test(
+    'timefilter_min',
+    check(
+      { data: { url: 'http://example.com?min=%timefilter_min%' } },
+      { data: { url: 'http://example.com?min=123456' } }
+    )
+  );
+  test(
+    'timefilter_max',
+    check(
+      { data: { url: 'http://example.com?min=%timefilter_max%' } },
+      { data: { url: 'http://example.com?min=654321' } }
+    )
+  );
 });
 
 describe('VegaParser.parseSchema', () => {

src/plugins/vis_types/vega/public/data_model/vega_parser.ts

@@ -676,6 +676,11 @@ The URL is an identifier only. Kibana and your browser will never access this UR
           );
         }
         onFind(obj as Data);
+      } else if (key === 'data' && typeof obj.url === 'string') {
+        const bounds = this.timeCache.getTimeBounds();
+        obj.url = obj.url
+          .replaceAll('%timefilter_min%', bounds.min.toString())
+          .replaceAll('%timefilter_max%', bounds.max.toString());
       } else {
         for (const k of Object.keys(obj)) {
           this._findObjectDataUrls(obj[k], onFind, k);