Add validation to the period enum

Author: hasithakn

components/org.wso2.openbanking.cds.metrics/src/main/java/org/wso2/openbanking/cds/metrics/util/PeriodEnum.java

@@ -48,4 +48,21 @@ public String toString() {
         return String.valueOf(text);
     }
 
+    /**
+     * Check if the given period is valid enum value
+     * Valid values : CURRENT, HISTORIC, ALL
+     * As defined in the specification values MUST be in all caps.
+     *
+     * @param period - Period to be checked
+     * @return - true if the period is valid, false otherwise
+     */
+    public static boolean isValidPeriodEnum(String period) {
+        for (PeriodEnum periodEnum : PeriodEnum.values()) {
+            if (periodEnum.name().equals(period)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
 }

internal-apis/internal-webapps/org.wso2.openbanking.cds.metrics.endpoint/src/main/java/org/wso2/openbanking/cds/metrics/endpoint/impl/MetricsApiImpl.java

@@ -63,6 +63,15 @@ public Response getMetrics(String xV, String period, String xMinV) {
                     "Requested x-v version is not supported", new CDSErrorMeta()));
             return Response.status(Response.Status.NOT_ACCEPTABLE).entity(ErrorUtil.getErrorJson(errorList)).build();
         }
+
+        if (!PeriodEnum.isValidPeriodEnum(period)) {
+            log.error("Error occurred due to invalid period value.");
+            JSONArray errorList = new JSONArray();
+            errorList.add(ErrorUtil.getErrorObject(ErrorConstants.AUErrorEnum.INVALID_FIELD,
+                    "Requested period value is invalid", new CDSErrorMeta()));
+            return Response.status(Response.Status.BAD_REQUEST).entity(ErrorUtil.getErrorJson(errorList)).build();
+        }
+
         PeriodEnum periodEnum = PeriodEnum.fromString(period);
 
         try {