Check tenant IDs of cached queries before sending to Grafana

components/analytics-mgt/grafana-mgt/io.entgra.analytics.mgt.grafana.proxy.core/src/main/java/io/entgra/analytics/mgt/grafana/proxy/core/service/impl/GrafanaQueryServiceImpl.java

@@ -68,8 +68,23 @@ public class GrafanaQueryServiceImpl implements GrafanaQueryService {
             int datasourceId = datasourceIdJson.getAsInt();
             CacheManager cacheManager = CacheManager.getInstance();
             String encodedQuery = cacheManager.getEncodedQueryCache().getIfPresent(rawSql);
-            if (cacheManager.getEncodedQueryCache().getIfPresent(rawSql) != null) {
+            if (encodedQuery != null && !encodedQuery.isEmpty()) {
+                // Checks if the tenant ID in the cached query (encodedQuery) is matching the current tenant ID
+                // taken from Carbon Context and if it's not matching then the query is modified with the current
+                // tenant ID and then added to the cache
+                if (encodedQuery.contains(GrafanaConstants.ENCODED_QUERY_TENANT_ID_KEY)) {
+                    String encodedQueryTenantId = GrafanaPreparedQueryBuilder.getEncodedQueryTenantId(encodedQuery);
+                    boolean isMatchingTenantId = GrafanaPreparedQueryBuilder.isMatchingTenantId(encodedQueryTenantId);
+                    if (isMatchingTenantId) {
                         queryObj.addProperty(GrafanaConstants.RAW_SQL_KEY, encodedQuery);
+                    } else {
+                        String modifiedEncodedQuery = GrafanaPreparedQueryBuilder.modifyEncodedQuery(encodedQuery);
+                        CacheManager.getInstance().getEncodedQueryCache().put(rawSql, modifiedEncodedQuery);
+                        queryObj.addProperty(GrafanaConstants.RAW_SQL_KEY, modifiedEncodedQuery);
+                    }
+                } else {
+                    queryObj.addProperty(GrafanaConstants.RAW_SQL_KEY, encodedQuery);
+                }
                 return;
             }
             Datasource datasource = cacheManager.getDatasourceAPICache().getIfPresent(datasourceId);

components/analytics-mgt/grafana-mgt/io.entgra.analytics.mgt.grafana.proxy.core/src/main/java/io/entgra/analytics/mgt/grafana/proxy/core/sql/query/GrafanaPreparedQueryBuilder.java

@@ -38,6 +38,7 @@ public class GrafanaPreparedQueryBuilder {
     private static final String VAR_PARAM_TEMPLATE = "$param";
     private static final String GRAFANA_QUOTED_VAR_REGEX = "('\\$(\\d|\\w|_)+')|('\\$\\{.*?\\}')|(\"\\$(\\d|\\w|_)+\")|(\"\\$\\{.*?\\}\")";
     private static final String GRAFANA_VAR_REGEX = "(\\$(\\d|\\w|_)+)|(\\$\\{.*?\\})";
+    private static final String ENCODED_QUERY_TENANT_ID_REGEX = "TENANT_ID\\s=\\s('[^']+'|-?[1-9]\\d*|0)";
 
 
     public static PreparedQuery build(String queryTemplate, String rawQuery) throws QueryMisMatch {
@@ -125,6 +126,60 @@ public class GrafanaPreparedQueryBuilder {
         return new PreparedQuery(preparedQueryBuilder.toString(), parameters);
     }
 
+    /**
+     * Get the tenant ID used in the cached query with the matching regex pattern which are integers that
+     * may or may not have surrounding single quotes and could have a minus sign (e.g., '-1234')
+     * @param encodedQuery the cached query
+     * @return returns the tenant ID extracted from the cached query
+     */
+    public static String getEncodedQueryTenantId(String encodedQuery) {
+        Pattern pattern = Pattern.compile(ENCODED_QUERY_TENANT_ID_REGEX);
+        Matcher matcher = pattern.matcher(encodedQuery);
+        String encodedQueryTenantId = "";
+        while (matcher.find()) {
+            encodedQueryTenantId = matcher.group(1);
+            if (encodedQueryTenantId != null && !encodedQueryTenantId.isEmpty()) {
+                break;
+            }
+        }
+        return unQuoteString(encodedQueryTenantId);
+    }
+
+    /**
+     * Checks if passed tenant ID is matching with tenant ID from Carbon Context
+     * @param encodedQueryTenantId the tenant ID
+     * @return true if tenant IDs match otherwise false
+     */
+    public static boolean isMatchingTenantId(String encodedQueryTenantId) {
+        if (encodedQueryTenantId != null && !encodedQueryTenantId.isEmpty()) {
+            return GrafanaUtil.getTenantId() == Integer.parseInt(encodedQueryTenantId);
+        }
+        return false;
+    }
+
+    /**
+     * Modify the tenant ID used in the cached query to the current tenant ID taken from Carbon Context
+     * with the matching regex pattern which are integers that may or may not have surrounding single quotes and
+     * could have a minus sign (e.g., '-1234')
+     * @param encodedQuery the cached query
+     * @return returns the modified query with the current tenant ID
+     */
+    public static String modifyEncodedQuery(String encodedQuery) {
+        Pattern pattern = Pattern.compile(ENCODED_QUERY_TENANT_ID_REGEX);
+        Matcher matcher = pattern.matcher(encodedQuery);
+        StringBuffer stringBuffer = new StringBuffer(encodedQuery.length());
+        String encodedQueryTenantId = "";
+        while (matcher.find()) {
+            encodedQueryTenantId = matcher.group(1);
+            if (encodedQueryTenantId != null && !encodedQueryTenantId.isEmpty()) {
+                matcher.appendReplacement(stringBuffer, Matcher.quoteReplacement(
+                        GrafanaConstants.ENCODED_QUERY_TENANT_ID_KEY + " " + GrafanaUtil.getTenantId()));
+            }
+        }
+        matcher.appendTail(stringBuffer);
+        return stringBuffer.toString();
+    }
+
     private static String[] splitByComma(String str) {
         // Using regex to avoid splitting by comma inside quotes
         return str.split("(\\s|\\t)*,(\\s|\\t)*(?=(?:[^'\"]*['|\"][^'\"]*['|\"])*[^'\"]*$)");
@@ -194,5 +249,4 @@ public class GrafanaPreparedQueryBuilder {
     private static String singleQuoteString(String str) {
         return "'" + str + "'";
     }
-
 }

components/analytics-mgt/grafana-mgt/io.entgra.analytics.mgt.grafana.proxy.core/src/main/java/io/entgra/analytics/mgt/grafana/proxy/core/util/GrafanaConstants.java

@@ -39,6 +39,7 @@ public class GrafanaConstants {
     public static final int IFRAME_URL_DASHBOARD_UID_INDEX = 1;
 
     public static final String TENANT_ID_VAR_NAME = "tenantId";
+    public static final String ENCODED_QUERY_TENANT_ID_KEY = "TENANT_ID =";
     public static final String VAR_PREFIX = "$";
     public static final String TENANT_ID_VAR = VAR_PREFIX + TENANT_ID_VAR_NAME;
     public static final String QUERY_PARAM_VAR_PREFIX = "var-";