Add date wrapping metadata

lib/cartodb/api/middlewares/layergroup-metadata.js

@@ -7,6 +7,7 @@ module.exports = function setMetadataToLayergroup (layergroupMetadata, includeQu
         layergroupMetadata.addAnalysesMetadata(user, layergroup, analysesResults, includeQuery);
         layergroupMetadata.addTurboCartoContextMetadata(layergroup, mapConfig.obj(), context);
         layergroupMetadata.addAggregationContextMetadata(layergroup, mapConfig.obj(), context);
+        layergroupMetadata.addDateWrappingMetadata (layergroup, mapConfig.obj());
         layergroupMetadata.addTileJsonMetadata(layergroup, user, mapConfig);
 
         next();

lib/cartodb/utils/date-wrapper.js

@@ -8,19 +8,19 @@ const DATE_OIDS = Object.freeze({
 
 /**
  * Wrap a query transforming all date columns into a unix epoch
- * @param {*} originalQuery 
- * @param {*} fields 
+ * @param {*} originalQuery
+ * @param {*} fields
  */
 function wrapDates(originalQuery, fields) {
     return `
-        SELECT 
-            ${fields.map(field =>  _isDateType(field) ? _castColumnToEpoch(field.name) : `${field.name}`).join(',')} 
-        FROM 
+        SELECT
+            ${fields.map(field =>  _isDateType(field) ? _castColumnToEpoch(field.name) : `${field.name}`).join(',')}
+        FROM
             (${originalQuery}) _cdb_epoch_transformation `;
 }
 
 /**
- * @param {object} field 
+ * @param {object} field
  */
 function _isDateType(field) {
     return DATE_OIDS.hasOwnProperty(field.dataTypeID);
@@ -31,9 +31,25 @@ function _isDateType(field) {
  * @param {string} column - The name of the date column
  */
 function _castColumnToEpoch(columnName) {
-    return `date_part('epoch', ${columnName}) as "${columnName}"`;
+    return `date_part('epoch', "${columnName}") as "${columnName}"`;
+}
+
+function wrappedDates(query) {
+    if (query.match(/\b_cdb_epoch_transformation\b/)) {
+        const columns = [];
+        const fieldMatcher = /\bdate_part\('epoch', "([^"]+)"\) as "([^"]+)"/gmi;
+        let match;
+        do {
+            match = fieldMatcher.exec(query);
+            if (match && match[1] === match[2]) {
+                columns.push(match[1]);
+            }
+        } while (match);
+        return columns;
+    }
 }
 
 module.exports = {
-    wrapDates
+    wrapDates,
+    wrappedDates
 };

lib/cartodb/utils/layergroup-metadata.js

@@ -1,3 +1,5 @@
+const dateWrapper = require('./date-wrapper');
+
 module.exports = class LayergroupMetadata {
     constructor (resourceLocator) {
         this.resourceLocator = resourceLocator;
@@ -165,4 +167,18 @@ module.exports = class LayergroupMetadata {
             });
         }
     }
+
+    addDateWrappingMetadata (layergroup, mapConfig) {
+        if (layergroup.metadata && Array.isArray(layergroup.metadata.layers) && Array.isArray(mapConfig.layers)) {
+            layergroup.metadata.layers = layergroup.metadata.layers.map(function(layer, layerIndex) {
+                const mapConfigLayer = mapConfig.layers[layerIndex];
+                const wrappedColumns = dateWrapper.wrappedDates(mapConfigLayer.options.sql);
+                if (wrappedColumns) {
+                    layer.meta.dates_as_numbers = wrappedColumns;
+                }
+                return layer;
+            });
+        }
+    }
+
 };