Fix Certificate test case and delete and search option

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.cert.admin.api/src/main/java/io/entgra/device/mgt/core/certificate/mgt/cert/admin/api/CertificateManagementAdminService.java

@@ -247,14 +247,15 @@ public interface CertificateManagementAdminService {
      *
      * @return paginated result of certificate.
      */
+
     @GET
     @ApiOperation(
             consumes = MediaType.APPLICATION_JSON,
             produces = MediaType.APPLICATION_JSON,
             httpMethod = "GET",
-            value = "Getting Details of Certificates",
+            value = "Getting Details of search Certificates",
-            notes = "Get all the details of the certificates you have used for mutual SSL. In a situation where you wish to "
+            notes = "Get all the details of the search certificates you have used for mutual SSL. In a situation where you wish to "
-                    + "view all the certificate details, it is not feasible to show all the details on one "
+                    + "view all the search certificate details, it is not feasible to show all the details on one "
                     + "page. Therefore, the details are paginated.",
             tags = "Certificate Management",
             extensions = {
@@ -308,24 +309,42 @@ public interface CertificateManagementAdminService {
     })
     Response getAllCertificates(
             @ApiParam(
-                    name = "offset",
+                    name = "serialNumber",
-                    value = "The starting pagination index for the complete list of qualified items.",
+                    value = "The serial number of the certificates",
                     required = false,
                     defaultValue = "0")
-            @QueryParam("offset") int offset,
+            @QueryParam("serialNumber") String serialNumber,
             @ApiParam(
-                    name = "limit",
+                    name = "deviceIdentifier",
-                    value = "Provide how many certificate details you require from the starting pagination index/offset.",
+                    value = "The device identifier of the certificates",
                     required = false,
-                    defaultValue = "5")
+                    defaultValue = "0")
-            @QueryParam("limit") int limit,
+            @QueryParam("deviceIdentifier") String deviceIdentifier,
+            @ApiParam(
+                    name = "username",
+                    value = "User name of the certificate added user" ,
+                    required = false,
+                    defaultValue = "0")
+            @QueryParam("username") String username,
             @ApiParam(
                     name = "If-Modified-Since",
                     value = "Checks if the requested variant was modified, since the specified date-time. \n" +
                             "Provide the value in the following format: EEE, d MMM yyyy HH:mm:ss Z.\n" +
                             "Example: Mon, 05 Jan 2014 15:10:00 +0200",
                     required = false)
-            @HeaderParam("If-Modified-Since") String ifModifiedSince);
+            @HeaderParam("If-Modified-Since") String ifModifiedSince,
+            @ApiParam(
+                    name = "offset",
+                    value = "The starting pagination index for the complete list of qualified items.",
+                    required = false,
+                    defaultValue = "0")
+            @QueryParam("offset") int offset,
+            @ApiParam(
+                    name = "limit",
+                    value = "Provide how many certificate details you require from the starting pagination index/offset.",
+                    required = false,
+                    defaultValue = "5")
+            @QueryParam("limit") int limit);
 
     @DELETE
     @ApiOperation(

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.cert.admin.api/src/main/java/io/entgra/device/mgt/core/certificate/mgt/cert/admin/api/impl/CertificateManagementAdminServiceImpl.java

@@ -18,7 +18,6 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.cert.admin.api.impl;
 
-import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
 import javax.ws.rs.HeaderParam;
@@ -26,7 +25,8 @@ import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.QueryParam;
-import javax.ws.rs.core.MediaType;
+
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import io.entgra.device.mgt.core.certificate.mgt.cert.admin.api.CertificateManagementAdminService;
@@ -84,6 +84,13 @@ public class CertificateManagementAdminServiceImpl implements CertificateManagem
                 certificate.setTenantId(PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId());
                 certificate.setSerial(enrollmentCertificate.getSerial());
                 certificate.setCertificate(certificateService.pemToX509Certificate(enrollmentCertificate.getPem()));
+                CertificateResponse existingCertificate = certificateService.getCertificateBySerial(enrollmentCertificate.getSerial());
+                if (existingCertificate != null) {
+                    return Response.status(Response.Status.BAD_REQUEST)
+                            .entity("Certificate with serial number " + enrollmentCertificate.getSerial() + " already exists.")
+                            .build();
+                }
+
                 certificates.add(certificate);
             }
             certificateService.saveCertificate(certificates);
@@ -131,13 +138,24 @@ public class CertificateManagementAdminServiceImpl implements CertificateManagem
      */
     @GET
     public Response getAllCertificates(
-            @QueryParam("offset") int offset,
+            @QueryParam("serialNumber") String serialNumber, @QueryParam("deviceIdentifier") String deviceIdentifier,
-            @QueryParam("limit") int limit,
+            @QueryParam("username") String username, @HeaderParam("If-Modified-Since") String ifModifiedSince, @QueryParam("offset") int offset,
-            @HeaderParam("If-Modified-Since") String ifModifiedSince) {
+            @QueryParam("limit") int limit) {
         RequestValidationUtil.validatePaginationInfo(offset, limit);
         CertificateManagementService certificateService = CertificateMgtAPIUtils.getCertificateManagementService();
+        CertificatePaginationRequest request = new CertificatePaginationRequest(offset, limit);
+
+        if (serialNumber != null && !serialNumber.isEmpty()) {
+            request.setSerialNumber(serialNumber);
+        }
+        if (deviceIdentifier != null){
+            request.setDeviceIdentifier(deviceIdentifier);
+        }
+        if (username != null){
+            request.setUsername(username);
+        }
         try {
-            PaginationResult result = certificateService.getAllCertificates(offset, limit);
+            PaginationResult result = certificateService.getAllCertificates(request);
             CertificateList certificates = new CertificateList();
             certificates.setCount(result.getRecordsTotal());
             certificates.setList((List<CertificateResponse>) result.getData());
@@ -151,20 +169,34 @@ public class CertificateManagementAdminServiceImpl implements CertificateManagem
     }
 
     @DELETE
-    public Response removeCertificate(@QueryParam("certificateId") String certificateId) {
+    public Response removeCertificate(@QueryParam("serialNumber") String serialNumber) {
-        RequestValidationUtil.validateCertificateId(certificateId);
+        RequestValidationUtil.validateSerialNumber(serialNumber);
 
         CertificateManagementService certificateService = CertificateMgtAPIUtils.getCertificateManagementService();
         try {
-            boolean status = certificateService.removeCertificate(certificateId);
+            boolean decision = certificateService.getValidateMetaValue();
+            if (decision) {
+                try {
+                    boolean status = certificateService.removeCertificate(serialNumber);
                     if (!status) {
                         return Response.status(Response.Status.NOT_FOUND).entity(
                                 "No certificate is found with the given " +
-                                "certificate id '" + certificateId + "'").build();
+                                        "serial number '" + serialNumber + "'").build();
                     } else {
                         return Response.status(Response.Status.OK).entity(
-                        "Certificate that carries the certificate id '" +
+                                "Certificate that carries the serial number '" +
-                                certificateId + "' has been removed").build();
+                                        serialNumber + "' has been removed").build();
+                    }
+                } catch (CertificateManagementException e) {
+                    String msg = "Error occurred while converting PEM file to X509Certificate";
+                    log.error(msg, e);
+                    return Response.serverError().entity(
+                            new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+                }
+            } else {
+                return Response.status(Response.Status.NOT_FOUND).entity(
+                        "User not have to access delete certificate " +
+                                "serial number '" + serialNumber + "'").build();
             }
         } catch (CertificateManagementException e) {
             String msg = "Error occurred while converting PEM file to X509Certificate";

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.cert.admin.api/src/main/java/io/entgra/device/mgt/core/certificate/mgt/cert/admin/api/util/RequestValidationUtil.java

@@ -30,14 +30,6 @@ public class RequestValidationUtil {
         }
     }
 
-    public static void validateCertificateId(String certificateId) {
-        if (certificateId == null || certificateId.isEmpty()) {
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(400l).setMessage(
-                            "Certificate Id cannot be null or empty").build());
-        }
-    }
-
     public static void validatePaginationInfo(int offset, int limit) {
         if (offset < 0) {
             throw new InputValidationException(

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/pom.xml

@@ -95,7 +95,8 @@
                             io.entgra.device.mgt.core.device.mgt.core.*,
                             org.wso2.carbon.registry.indexing.*,
                             javax.cache.*,
-                            javax.naming.ldap
+                            javax.naming.ldap,
+                            com.google.gson.*
                             <!--org.bouncycastle.pkcs.jcajce-->
                         </Import-Package>
                         <Export-Package>
@@ -253,6 +254,10 @@
             <artifactId>slf4j-simple</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.googlecode.json-simple.wso2</groupId>
+            <artifactId>json-simple</artifactId>
+        </dependency>
     </dependencies>
 </project>
 

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/CertificateDAO.java

@@ -18,8 +18,10 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.dao;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.bean.Certificate;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
+import io.entgra.device.mgt.core.certificate.mgt.core.exception.CertificateManagementException;
 import io.entgra.device.mgt.core.certificate.mgt.core.service.PaginationResult;
 
 import java.util.List;
@@ -75,13 +77,12 @@ public interface CertificateDAO {
     /**
      * Get all the certificates in a paginated manner.
      *
-     * @param rowNum Stating index of the paginated result.
+     * @param request index of the paginated result.
-     * @param limit Number of records to return.
      * @return Pagination result with data and the count of results.
      * @throws CertificateManagementDAOException
      *
      */
-    PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementDAOException;
+    PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementDAOException;
 
     /**
      * Get all the certificates.
@@ -95,10 +96,10 @@ public interface CertificateDAO {
     /**
      * Delete a certificate identified by a serial number()
      *
-     * @param certificateId number
+     * @param serialNumber number
      * @return whether the certificate was removed or not.
      */
-    boolean removeCertificate(String certificateId) throws CertificateManagementDAOException;
+    boolean removeCertificate(String serialNumber) throws CertificateManagementDAOException;
 
     List<CertificateResponse> searchCertificate(String serialNumber) throws CertificateManagementDAOException;
 

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/AbstractCertificateDAOImpl.java

@@ -237,7 +237,7 @@ public abstract class AbstractCertificateDAOImpl implements CertificateDAO{
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
         try {
             Connection conn = this.getConnection();
-            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, ID, DEVICE_IDENTIFIER, TENANT_ID, USERNAME"
+            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, TENANT_ID, USERNAME"
                          + " FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ? ORDER BY ID DESC";
             stmt = conn.prepareStatement(sql);
             stmt.setInt(1, tenantId);
@@ -247,8 +247,6 @@ public abstract class AbstractCertificateDAOImpl implements CertificateDAO{
                 certificateResponse = new CertificateResponse();
                 byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
                 certificateResponse.setSerialNumber(resultSet.getString("SERIAL_NUMBER"));
-                certificateResponse.setCertificateId(resultSet.getString("ID"));
-                certificateResponse.setDeviceIdentifier(resultSet.getString("DEVICE_IDENTIFIER"));
                 certificateResponse.setTenantId(resultSet.getInt("TENANT_ID"));
                 certificateResponse.setUsername(resultSet.getString("USERNAME"));
                 CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
@@ -265,7 +263,7 @@ public abstract class AbstractCertificateDAOImpl implements CertificateDAO{
     }
 
     @Override
-    public boolean removeCertificate(String certificateId) throws CertificateManagementDAOException {
+    public boolean removeCertificate(String serialNumber) throws CertificateManagementDAOException {
         Connection conn;
         PreparedStatement stmt = null;
         ResultSet resultSet = null;
@@ -273,15 +271,15 @@ public abstract class AbstractCertificateDAOImpl implements CertificateDAO{
         try {
             conn = this.getConnection();
             String query =
-                    "DELETE FROM DM_DEVICE_CERTIFICATE WHERE ID = ?" +
+                    "DELETE FROM DM_DEVICE_CERTIFICATE WHERE SERIAL_NUMBER = ?" +
                     " AND TENANT_ID = ? ";
             stmt = conn.prepareStatement(query);
-            stmt.setString(1, certificateId);
+            stmt.setString(1, serialNumber);
             stmt.setInt(2, tenantId);
 
             return stmt.executeUpdate() > 0;
         } catch (SQLException e) {
-            String msg = "Unable to get the read the certificate with certificate id" + certificateId;
+            String msg = "Unable to get the read the certificate with serialNumber" + serialNumber;
             log.error(msg, e);
             throw new CertificateManagementDAOException(msg, e);
         } finally {

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/GenericCertificateDAOImpl.java

@@ -18,6 +18,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.dao.impl;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.CertificateGenerator;
 import org.apache.commons.logging.Log;
@@ -47,47 +48,120 @@ public class GenericCertificateDAOImpl extends AbstractCertificateDAOImpl {
     private Connection getConnection() throws SQLException {
         return CertificateManagementDAOFactory.getConnection();
     }
-    private int getCertificateCount(int tenantId) throws CertificateManagementDAOException, SQLException {
+
+    private int getCertificateCount(CertificatePaginationRequest request) throws CertificateManagementDAOException {
         int certificateCount = 0;
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+
         try {
             Connection conn = this.getConnection();
-            String sql =
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");
-                    "SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?";
+
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                queryBuilder.append(" AND SERIAL_NUMBER = ?");
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                queryBuilder.append(" AND DEVICE_IDENTIFIER = ?");
+            }
+
+            if (username != null && !username.isEmpty()) {
+                queryBuilder.append(" AND USERNAME LIKE ?");
+            }
+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);
             stmt.setInt(1, tenantId);
-                try (ResultSet rs = stmt.executeQuery()) {
+
-                    if (rs.next()) {
+            int paramIdx = 2;
-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                stmt.setString(paramIdx++, serialNumber);
             }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                stmt.setString(paramIdx++, deviceIdentifier);
             }
+
+            if (username != null && !username.isEmpty()) {
+                stmt.setString(paramIdx, "%" + username + "%");
+            }
+
+            rs = stmt.executeQuery();
+
+            if (rs.next()) {
+                certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
             }
         } catch (SQLException e) {
-            String errorMsg = "SQL error occurred while retrieving the certificates.";
+            String errorMsg = "SQL error occurred while retrieving the certificate count.";
             log.error(errorMsg, e);
             throw new CertificateManagementDAOException(errorMsg, e);
+        } finally {
+            CertificateManagementDAOUtil.cleanupResources(stmt, rs);
         }
+
         return certificateCount;
     }
 
+
+
     @Override
-    public PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementDAOException {
+    public PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementDAOException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
         PreparedStatement stmt = null;
         ResultSet resultSet = null;
         CertificateResponse certificateResponse;
         List<CertificateResponse> certificates = new ArrayList<>();
         PaginationResult paginationResult;
-        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        boolean isCertificateSerialNumberProvided = false;
+        boolean isCertificateDeviceIdentifierProvided = false;
+        boolean isCertificateUsernameProvided = false;
+
         try {
             Connection conn = this.getConnection();
-            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, ID, DEVICE_IDENTIFIER, TENANT_ID, USERNAME FROM "
+            String query = "SELECT * " +
-                         + "DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ? ORDER BY ID DESC LIMIT ?,?";
+                    "FROM DM_DEVICE_CERTIFICATE " +
-            stmt = conn.prepareStatement(sql);
+                    "WHERE TENANT_ID = ? ";
-            stmt.setInt(1, tenantId);
+            if (serialNumber != null && !serialNumber.isEmpty()) {
-            stmt.setInt(2, rowNum);
+                query += "AND SERIAL_NUMBER = ? ";
-            stmt.setInt(3, limit);
+                isCertificateSerialNumberProvided = true;
-            resultSet = stmt.executeQuery();
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                query += "AND DEVICE_IDENTIFIER = ? ";
+                isCertificateDeviceIdentifierProvided = true;
+            }
+
+            if (username != null && !username.isEmpty()) {
+                query += "AND USERNAME LIKE ? ";
+                isCertificateUsernameProvided = true;
+            }
+
+            query += "ORDER BY ID LIMIT ?,?";
 
-            int resultCount = 0;
+            stmt = conn.prepareStatement(query);
+            int paramIdx = 1;
+            stmt.setInt(paramIdx++, tenantId);
+            if (isCertificateSerialNumberProvided) {
+                stmt.setString(paramIdx++, serialNumber);
+            }
+            if (isCertificateDeviceIdentifierProvided) {
+                stmt.setString(paramIdx++, deviceIdentifier);
+            }
+            if (isCertificateUsernameProvided) {
+                stmt.setString(paramIdx++, "%" + username + "%");
+            }
+            stmt.setInt(paramIdx++, request.getStartIndex());
+            stmt.setInt(paramIdx++, request.getRowCount());
+            resultSet = stmt.executeQuery();
             while (resultSet.next()) {
                 certificateResponse = new CertificateResponse();
                 byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
@@ -98,11 +172,11 @@ public class GenericCertificateDAOImpl extends AbstractCertificateDAOImpl {
                 certificateResponse.setUsername(resultSet.getString("USERNAME"));
                 CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
                 certificates.add(certificateResponse);
-                resultCount++;
             }
             paginationResult = new PaginationResult();
             paginationResult.setData(certificates);
-            paginationResult.setRecordsTotal(this.getCertificateCount(tenantId));
+            paginationResult.setRecordsTotal(this.getCertificateCount(request));
+
         } catch (SQLException e) {
             String errorMsg = "SQL error occurred while retrieving the certificates.";
             log.error(errorMsg, e);

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/OracleCertificateDAOImpl.java

@@ -18,6 +18,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.dao.impl;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.CertificateGenerator;
 import org.apache.commons.logging.Log;
@@ -44,24 +45,57 @@ public class OracleCertificateDAOImpl extends AbstractCertificateDAOImpl {
     private static final Log log = LogFactory.getLog(OracleCertificateDAOImpl.class);
 
     @Override
-    public PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementDAOException {
+    public PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementDAOException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
         PreparedStatement stmt = null;
         ResultSet resultSet = null;
         CertificateResponse certificateResponse;
         List<CertificateResponse> certificates = new ArrayList<>();
         PaginationResult paginationResult;
-        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        boolean isCertificateSerialNumberProvided = false;
+        boolean isCertificateDeviceIdentifierProvided = false;
+        boolean isCertificateUsernameProvided = false;
+
         try {
             Connection conn = this.getConnection();
-            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, ID, DEVICE_IDENTIFIER, TENANT_ID, USERNAME FROM "
+            String query = "SELECT * " +
-                         + "DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ? ORDER BY ID DESC OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+                    "FROM DM_DEVICE_CERTIFICATE " +
-            stmt = conn.prepareStatement(sql);
+                    "WHERE TENANT_ID = ? ";
-            stmt.setInt(1, tenantId);
+            if (serialNumber != null && !serialNumber.isEmpty()) {
-            stmt.setInt(2, rowNum);
+                query += "AND SERIAL_NUMBER = ? ";
-            stmt.setInt(3, limit);
+                isCertificateSerialNumberProvided = true;
-            resultSet = stmt.executeQuery();
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                query += "AND DEVICE_IDENTIFIER = ? ";
+                isCertificateDeviceIdentifierProvided = true;
+            }
+
+            if (username != null && !username.isEmpty()) {
+                query += "AND USERNAME LIKE ? ";
+                isCertificateUsernameProvided = true;
+            }
 
-            int resultCount = 0;
+            query += "ORDER BY ID OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+
+            stmt = conn.prepareStatement(query);
+            int paramIdx = 1;
+            stmt.setInt(paramIdx++, tenantId);
+            if (isCertificateSerialNumberProvided) {
+                stmt.setString(paramIdx++, serialNumber);
+            }
+            if (isCertificateDeviceIdentifierProvided) {
+                stmt.setString(paramIdx++, deviceIdentifier);
+            }
+            if (isCertificateUsernameProvided) {
+                stmt.setString(paramIdx++, "%" + username + "%");
+            }
+            stmt.setInt(paramIdx++, request.getStartIndex());
+            stmt.setInt(paramIdx++, request.getRowCount());
+            resultSet = stmt.executeQuery();
             while (resultSet.next()) {
                 certificateResponse = new CertificateResponse();
                 byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
@@ -72,11 +106,10 @@ public class OracleCertificateDAOImpl extends AbstractCertificateDAOImpl {
                 certificateResponse.setUsername(resultSet.getString("USERNAME"));
                 CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
                 certificates.add(certificateResponse);
-                resultCount++;
             }
             paginationResult = new PaginationResult();
             paginationResult.setData(certificates);
-            paginationResult.setRecordsTotal(this.getCertificateCount(tenantId));
+            paginationResult.setRecordsTotal(this.getCertificateCount(request));
         } catch (SQLException e) {
             String errorMsg = "SQL error occurred while retrieving the certificates.";
             log.error(errorMsg, e);
@@ -91,25 +124,63 @@ public class OracleCertificateDAOImpl extends AbstractCertificateDAOImpl {
         return CertificateManagementDAOFactory.getConnection();
     }
 
-    private int getCertificateCount(int tenantId) throws CertificateManagementDAOException, SQLException {
+    private int getCertificateCount(CertificatePaginationRequest request) throws CertificateManagementDAOException {
         int certificateCount = 0;
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+
         try {
             Connection conn = this.getConnection();
-            String sql =
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");
-                    "SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?";
+
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                queryBuilder.append(" AND SERIAL_NUMBER = ?");
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                queryBuilder.append(" AND DEVICE_IDENTIFIER = ?");
+            }
+
+            if (username != null && !username.isEmpty()) {
+                queryBuilder.append(" AND USERNAME LIKE ?");
+            }
+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);
             stmt.setInt(1, tenantId);
-                try (ResultSet rs = stmt.executeQuery()) {
+
-                    if (rs.next()) {
+            int paramIdx = 2;
-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                stmt.setString(paramIdx++, serialNumber);
             }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                stmt.setString(paramIdx++, deviceIdentifier);
             }
+
+            if (username != null && !username.isEmpty()) {
+                stmt.setString(paramIdx, "%" + username + "%");
+            }
+
+            rs = stmt.executeQuery();
+
+            if (rs.next()) {
+                certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
             }
         } catch (SQLException e) {
-            String errorMsg = "SQL error occurred while retrieving the certificates.";
+            String errorMsg = "SQL error occurred while retrieving the certificate count.";
             log.error(errorMsg, e);
             throw new CertificateManagementDAOException(errorMsg, e);
+        } finally {
+            CertificateManagementDAOUtil.cleanupResources(stmt, rs);
         }
+
         return certificateCount;
     }
+
 }

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/PostgreSQLCertificateDAOImpl.java

@@ -18,6 +18,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.dao.impl;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.CertificateGenerator;
 import org.apache.commons.logging.Log;
@@ -44,24 +45,57 @@ public class PostgreSQLCertificateDAOImpl extends AbstractCertificateDAOImpl {
     private static final Log log = LogFactory.getLog(PostgreSQLCertificateDAOImpl.class);
 
     @Override
-    public PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementDAOException {
+    public PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementDAOException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
         PreparedStatement stmt = null;
         ResultSet resultSet = null;
         CertificateResponse certificateResponse;
         List<CertificateResponse> certificates = new ArrayList<>();
         PaginationResult paginationResult;
-        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        boolean isCertificateSerialNumberProvided = false;
+        boolean isCertificateDeviceIdentifierProvided = false;
+        boolean isCertificateUsernameProvided = false;
+
         try {
             Connection conn = this.getConnection();
-            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, ID, DEVICE_IDENTIFIER, TENANT_ID, USERNAME FROM "
+            String query = "SELECT * " +
-                         + "DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ? ORDER BY ID DESC LIMIT ? OFFSET ?";
+                    "FROM DM_DEVICE_CERTIFICATE " +
-            stmt = conn.prepareStatement(sql);
+                    "WHERE TENANT_ID = ? ";
-            stmt.setInt(1, tenantId);
+            if (serialNumber != null && !serialNumber.isEmpty()) {
-            stmt.setInt(2, limit);
+                query += "AND SERIAL_NUMBER = ? ";
-            stmt.setInt(3, rowNum);
+                isCertificateSerialNumberProvided = true;
-            resultSet = stmt.executeQuery();
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                query += "AND DEVICE_IDENTIFIER = ? ";
+                isCertificateDeviceIdentifierProvided = true;
+            }
+
+            if (username != null && !username.isEmpty()) {
+                query += "AND USERNAME LIKE ? ";
+                isCertificateUsernameProvided = true;
+            }
 
-            int resultCount = 0;
+            query += "ORDER BY ID LIMIT ? OFFSET ?";
+
+            stmt = conn.prepareStatement(query);
+            int paramIdx = 1;
+            stmt.setInt(paramIdx++, tenantId);
+            if (isCertificateSerialNumberProvided) {
+                stmt.setString(paramIdx++, serialNumber);
+            }
+            if (isCertificateDeviceIdentifierProvided) {
+                stmt.setString(paramIdx++, deviceIdentifier);
+            }
+            if (isCertificateUsernameProvided) {
+                stmt.setString(paramIdx++, "%" + username + "%");
+            }
+            stmt.setInt(paramIdx++, request.getStartIndex());
+            stmt.setInt(paramIdx++, request.getRowCount());
+            resultSet = stmt.executeQuery();
             while (resultSet.next()) {
                 certificateResponse = new CertificateResponse();
                 byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
@@ -72,11 +106,11 @@ public class PostgreSQLCertificateDAOImpl extends AbstractCertificateDAOImpl {
                 certificateResponse.setUsername(resultSet.getString("USERNAME"));
                 CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
                 certificates.add(certificateResponse);
-                resultCount++;
             }
             paginationResult = new PaginationResult();
             paginationResult.setData(certificates);
-            paginationResult.setRecordsTotal(this.getCertificateCount(tenantId));
+            paginationResult.setRecordsTotal(this.getCertificateCount(request));
+
         } catch (SQLException e) {
             String errorMsg = "SQL error occurred while retrieving the certificates.";
             log.error(errorMsg, e);
@@ -91,25 +125,63 @@ public class PostgreSQLCertificateDAOImpl extends AbstractCertificateDAOImpl {
         return CertificateManagementDAOFactory.getConnection();
     }
 
-    private int getCertificateCount(int tenantId) throws CertificateManagementDAOException, SQLException {
+    private int getCertificateCount(CertificatePaginationRequest request) throws CertificateManagementDAOException {
         int certificateCount = 0;
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+
         try {
             Connection conn = this.getConnection();
-            String sql =
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");
-                    "SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?";
+
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                queryBuilder.append(" AND SERIAL_NUMBER = ?");
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                queryBuilder.append(" AND DEVICE_IDENTIFIER = ?");
+            }
+
+            if (username != null && !username.isEmpty()) {
+                queryBuilder.append(" AND USERNAME ILIKE ?");
+            }
+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);
             stmt.setInt(1, tenantId);
-                try (ResultSet rs = stmt.executeQuery()) {
+
-                    if (rs.next()) {
+            int paramIdx = 2;
-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                stmt.setString(paramIdx++, serialNumber);
             }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                stmt.setString(paramIdx++, deviceIdentifier);
             }
+
+            if (username != null && !username.isEmpty()) {
+                stmt.setString(paramIdx, "%" + username + "%");
+            }
+
+            rs = stmt.executeQuery();
+
+            if (rs.next()) {
+                certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
             }
         } catch (SQLException e) {
-            String errorMsg = "SQL error occurred while retrieving the certificates.";
+            String errorMsg = "SQL error occurred while retrieving the certificate count.";
             log.error(errorMsg, e);
             throw new CertificateManagementDAOException(errorMsg, e);
+        } finally {
+            CertificateManagementDAOUtil.cleanupResources(stmt, rs);
         }
+
         return certificateCount;
     }
+
 }

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/SQLServerCertificateDAOImpl.java

@@ -18,6 +18,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.dao.impl;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.CertificateGenerator;
 import org.apache.commons.logging.Log;
@@ -44,24 +45,57 @@ public class SQLServerCertificateDAOImpl extends AbstractCertificateDAOImpl {
     private static final Log log = LogFactory.getLog(SQLServerCertificateDAOImpl.class);
 
     @Override
-    public PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementDAOException {
+    public PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementDAOException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
         PreparedStatement stmt = null;
         ResultSet resultSet = null;
         CertificateResponse certificateResponse;
         List<CertificateResponse> certificates = new ArrayList<>();
         PaginationResult paginationResult;
-        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        boolean isCertificateSerialNumberProvided = false;
+        boolean isCertificateDeviceIdentifierProvided = false;
+        boolean isCertificateUsernameProvided = false;
+
         try {
             Connection conn = this.getConnection();
-            String sql = "SELECT CERTIFICATE, SERIAL_NUMBER, ID, DEVICE_IDENTIFIER, TENANT_ID, USERNAME FROM "
+            String query = "SELECT * " +
-                         + "DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ? ORDER BY ID DESC OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+                    "FROM DM_DEVICE_CERTIFICATE " +
-            stmt = conn.prepareStatement(sql);
+                    "WHERE TENANT_ID = ? ";
-            stmt.setInt(1, tenantId);
+            if (serialNumber != null && !serialNumber.isEmpty()) {
-            stmt.setInt(2, rowNum);
+                query += "AND SERIAL_NUMBER = ? ";
-            stmt.setInt(3, limit);
+                isCertificateSerialNumberProvided = true;
-            resultSet = stmt.executeQuery();
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                query += "AND DEVICE_IDENTIFIER = ? ";
+                isCertificateDeviceIdentifierProvided = true;
+            }
+
+            if (username != null && !username.isEmpty()) {
+                query += "AND USERNAME LIKE ? ";
+                isCertificateUsernameProvided = true;
+            }
 
-            int resultCount = 0;
+            query += "ORDER BY ID OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+
+            stmt = conn.prepareStatement(query);
+            int paramIdx = 1;
+            stmt.setInt(paramIdx++, tenantId);
+            if (isCertificateSerialNumberProvided) {
+                stmt.setString(paramIdx++, serialNumber);
+            }
+            if (isCertificateDeviceIdentifierProvided) {
+                stmt.setString(paramIdx++, deviceIdentifier);
+            }
+            if (isCertificateUsernameProvided) {
+                stmt.setString(paramIdx++, "%" + username + "%");
+            }
+            stmt.setInt(paramIdx++, request.getStartIndex());
+            stmt.setInt(paramIdx++, request.getRowCount());
+            resultSet = stmt.executeQuery();
             while (resultSet.next()) {
                 certificateResponse = new CertificateResponse();
                 byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
@@ -72,11 +106,11 @@ public class SQLServerCertificateDAOImpl extends AbstractCertificateDAOImpl {
                 certificateResponse.setUsername(resultSet.getString("USERNAME"));
                 CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
                 certificates.add(certificateResponse);
-                resultCount++;
             }
             paginationResult = new PaginationResult();
             paginationResult.setData(certificates);
-            paginationResult.setRecordsTotal(this.getCertificateCount(tenantId));
+            paginationResult.setRecordsTotal(this.getCertificateCount(request));
+
         } catch (SQLException e) {
             String errorMsg = "SQL error occurred while retrieving the certificates.";
             log.error(errorMsg, e);
@@ -91,25 +125,63 @@ public class SQLServerCertificateDAOImpl extends AbstractCertificateDAOImpl {
         return CertificateManagementDAOFactory.getConnection();
     }
 
-    private int getCertificateCount(int tenantId) throws CertificateManagementDAOException, SQLException {
+    private int getCertificateCount(CertificatePaginationRequest request) throws CertificateManagementDAOException {
         int certificateCount = 0;
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        String serialNumber = request.getSerialNumber();
+        String deviceIdentifier = request.getDeviceIdentifier();
+        String username = request.getUsername();
+        PreparedStatement stmt = null;
+        ResultSet rs = null;
+
         try {
             Connection conn = this.getConnection();
-            String sql =
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");
-                    "SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?";
+
-            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                queryBuilder.append(" AND SERIAL_NUMBER = ?");
+            }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                queryBuilder.append(" AND DEVICE_IDENTIFIER = ?");
+            }
+
+            if (username != null && !username.isEmpty()) {
+                queryBuilder.append(" AND USERNAME LIKE ?");
+            }
+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);
             stmt.setInt(1, tenantId);
-                try (ResultSet rs = stmt.executeQuery()) {
+
-                    if (rs.next()) {
+            int paramIdx = 2;
-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
+            if (serialNumber != null && !serialNumber.isEmpty()) {
+                stmt.setString(paramIdx++, serialNumber);
             }
+
+            if (deviceIdentifier != null && !deviceIdentifier.isEmpty()) {
+                stmt.setString(paramIdx++, deviceIdentifier);
             }
+
+            if (username != null && !username.isEmpty()) {
+                stmt.setString(paramIdx, "%" + username + "%");
+            }
+
+            rs = stmt.executeQuery();
+
+            if (rs.next()) {
+                certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
             }
         } catch (SQLException e) {
-            String errorMsg = "SQL error occurred while retrieving the certificates.";
+            String errorMsg = "SQL error occurred while retrieving the certificate count.";
             log.error(errorMsg, e);
             throw new CertificateManagementDAOException(errorMsg, e);
+        } finally {
+            CertificateManagementDAOUtil.cleanupResources(stmt, rs);
         }
+
         return certificateCount;
     }
+
 }

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/service/CertificateManagementService.java

@@ -17,6 +17,7 @@
  */
 package io.entgra.device.mgt.core.certificate.mgt.core.service;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.CertificateResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.dto.SCEPResponse;
 import io.entgra.device.mgt.core.certificate.mgt.core.exception.CertificateManagementException;
@@ -71,9 +72,11 @@ public interface CertificateManagementService {
 
     CertificateResponse retrieveCertificate(String serialNumber) throws CertificateManagementException;
 
-    PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementException;
+    PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementException;
 
-    boolean removeCertificate(String certificateId) throws CertificateManagementException;
+    boolean removeCertificate(String serialNumber) throws CertificateManagementException;
+
+    boolean getValidateMetaValue() throws CertificateManagementException;
 
     List<CertificateResponse> getCertificates() throws CertificateManagementException;
 

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/service/CertificateManagementServiceImpl.java

@@ -17,6 +17,14 @@
  */
 package io.entgra.device.mgt.core.certificate.mgt.core.service;
 
+
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonParser;
+import io.entgra.device.mgt.core.certificate.mgt.core.util.CertificateManagementConstants;
+import io.entgra.device.mgt.core.certificate.mgt.core.util.CertificateManagerUtil;
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import io.entgra.device.mgt.core.certificate.mgt.core.dao.CertificateDAO;
 import io.entgra.device.mgt.core.certificate.mgt.core.dao.CertificateManagementDAOException;
 import io.entgra.device.mgt.core.certificate.mgt.core.dao.CertificateManagementDAOFactory;
@@ -27,12 +35,14 @@ import io.entgra.device.mgt.core.certificate.mgt.core.exception.KeystoreExceptio
 import io.entgra.device.mgt.core.certificate.mgt.core.exception.TransactionManagementException;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.CertificateGenerator;
 import io.entgra.device.mgt.core.certificate.mgt.core.impl.KeyStoreReader;
-import io.entgra.device.mgt.core.certificate.mgt.core.util.CertificateManagementConstants;
+
-import io.entgra.device.mgt.core.certificate.mgt.core.util.CertificateManagerUtil;
+import io.entgra.device.mgt.core.device.mgt.common.exceptions.MetadataManagementException;
+import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.Metadata;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.bouncycastle.pkcs.PKCS10CertificationRequest;
 
+
 import java.io.InputStream;
 import java.security.PrivateKey;
 import java.security.cert.Certificate;
@@ -154,11 +164,11 @@ public class CertificateManagementServiceImpl implements CertificateManagementSe
     }
 
     @Override
-    public PaginationResult getAllCertificates(int rowNum, int limit) throws CertificateManagementException {
+    public PaginationResult getAllCertificates(CertificatePaginationRequest request) throws CertificateManagementException {
         try {
             CertificateManagementDAOFactory.openConnection();
             CertificateDAO certificateDAO = CertificateManagementDAOFactory.getCertificateDAO();
-            return certificateDAO.getAllCertificates(rowNum, CertificateManagerUtil.validateCertificateListPageSize(limit));
+            return certificateDAO.getAllCertificates(request);
         } catch (SQLException e) {
             String msg = "Error occurred while opening a connection to the underlying data source";
             log.error(msg, e);
@@ -172,28 +182,52 @@ public class CertificateManagementServiceImpl implements CertificateManagementSe
             CertificateManagementDAOFactory.closeConnection();
         }
     }
-
     @Override
-    public boolean removeCertificate(String certificateId) throws CertificateManagementException {
+    public boolean removeCertificate(String serialNumber) throws CertificateManagementException {
         try {
             CertificateManagementDAOFactory.beginTransaction();
             CertificateDAO certificateDAO = CertificateManagementDAOFactory.getCertificateDAO();
-            boolean status = certificateDAO.removeCertificate(certificateId);
+            boolean status = certificateDAO.removeCertificate(serialNumber);
             CertificateManagementDAOFactory.commitTransaction();
             return status;
         } catch (TransactionManagementException e) {
-            String msg = "Error occurred while removing certificate carrying certificate id '" + certificateId + "'";
+            String msg = "Error occurred while removing certificate carrying serialNumber '" + serialNumber + "'";
             log.error(msg, e);
             throw new CertificateManagementException(msg, e);
         } catch (CertificateManagementDAOException e) {
             CertificateManagementDAOFactory.rollbackTransaction();
-            String msg = "Error occurred while removing the certificate carrying certificate id '" + certificateId +
+            String msg = "Error occurred while removing the certificate carrying serialNumber '" + serialNumber +
                     "' from the certificate repository";
             log.error(msg, e);
             throw new CertificateManagementException(msg, e);
         }
     }
 
+    @Override
+    public boolean getValidateMetaValue() throws CertificateManagementException {
+        Metadata metadata;
+        try {
+            metadata = CertificateManagerUtil.getMetadataManagementService().retrieveMetadata(CertificateManagementConstants.CERTIFICATE_DELETE);
+            if (metadata != null) {
+                String metaValue = metadata.getMetaValue();
+                if (metaValue != null && !metaValue.isEmpty()) {
+                    JsonParser parser = new JsonParser();
+                    JsonObject jsonObject = parser.parse(metaValue).getAsJsonObject();
+                    return jsonObject.get(CertificateManagementConstants.IS_CERTIFICATE_DELETE_ENABLE).getAsBoolean();
+                }
+            }
+            return false;
+        } catch (MetadataManagementException e) {
+            String msg = "Error occurred while getting the metadata entry for metaKey: " + CertificateManagementConstants.CERTIFICATE_DELETE;
+            log.error(msg, e);
+            throw new CertificateManagementException(msg, e);
+        } catch (JsonParseException e) {
+            String msg = "Error occurred while parsing the JSON metadata value for metaKey: " + CertificateManagementConstants.CERTIFICATE_DELETE;
+            log.error(msg, e);
+            throw new CertificateManagementException(msg, e);
+        }
+    }
+
     @Override
     public List<CertificateResponse> getCertificates() throws CertificateManagementException {
         try {

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/util/CertificateManagementConstants.java

@@ -41,6 +41,12 @@ public final class CertificateManagementConstants {
     public static final int RSA_KEY_LENGTH = 2048;
     public static final String SIGNING_ALGORITHM = "SHA256withRSA";
 
+    public static final int DEFAULT_PAGE_LIMIT = 50;
+
+    public static final String CERTIFICATE_DELETE = "CERTIFICATE_DELETE";
+    public static final String IS_CERTIFICATE_DELETE_ENABLE = "isCertificateDelete";
+
+
     public static final class DataBaseTypes {
         private DataBaseTypes() {
             throw new AssertionError();

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/util/CertificateManagerUtil.java

@@ -19,6 +19,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.util;
 
+import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.MetadataManagementService;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.w3c.dom.Document;
@@ -28,6 +29,7 @@ import io.entgra.device.mgt.core.certificate.mgt.core.config.datasource.DataSour
 import io.entgra.device.mgt.core.certificate.mgt.core.config.datasource.JNDILookupDefinition;
 import io.entgra.device.mgt.core.certificate.mgt.core.dao.CertificateManagementDAOUtil;
 import io.entgra.device.mgt.core.certificate.mgt.core.exception.CertificateManagementException;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
 
 import javax.sql.DataSource;
 import javax.xml.XMLConstants;
@@ -41,6 +43,7 @@ public class CertificateManagerUtil {
 
     public static final String GENERAL_CONFIG_RESOURCE_PATH = "general";
     public static final String MONITORING_FREQUENCY = "notifierFrequency";
+    private static MetadataManagementService metadataManagementService;
     private static final Log log = LogFactory.getLog(CertificateManagerUtil.class);
 
     public static Document convertToDocument(File file) throws CertificateManagementException {
@@ -105,4 +108,26 @@ public class CertificateManagerUtil {
         return limit;
     }
 
+    /**
+     * Initializing and accessing method for MetadataManagementService.
+     *
+     * @return MetadataManagementService instance
+     * @throws IllegalStateException if metadataManagementService cannot be initialized
+     */
+    public static MetadataManagementService getMetadataManagementService() {
+        if (metadataManagementService == null) {
+            synchronized (CertificateManagerUtil.class) {
+                if (metadataManagementService == null) {
+                    PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+                    metadataManagementService = (MetadataManagementService) ctx.getOSGiService(
+                            MetadataManagementService.class, null);
+                    if (metadataManagementService == null) {
+                        throw new IllegalStateException("Metadata Management service not initialized.");
+                    }
+                }
+            }
+        }
+        return metadataManagementService;
+    }
+
 }

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/test/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/CertificateManagementServiceImplNegativeTests.java

@@ -18,6 +18,7 @@
 
 package io.entgra.device.mgt.core.certificate.mgt.core.impl;
 
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
 import org.mockito.Mockito;
 import org.powermock.api.mockito.PowerMockito;
@@ -110,7 +111,8 @@ public class CertificateManagementServiceImplNegativeTests extends PowerMockTest
     public void negativeTestGetAllCertificates() throws Exception {
         PowerMockito.mockStatic(CertificateManagementDAOFactory.class);
         PowerMockito.doThrow(new SQLException()).when(CertificateManagementDAOFactory.class, "openConnection");
-        instance.getAllCertificates(1, 2);
+        CertificatePaginationRequest request = new CertificatePaginationRequest(0, 2);
+        instance.getAllCertificates(request);
     }
 
     @Test(description = "This test case tests behaviour when an error occurs getting the list of certificates from repository"
@@ -118,7 +120,8 @@ public class CertificateManagementServiceImplNegativeTests extends PowerMockTest
     public void negativeTestGetAllCertificates2() throws Exception {
         CertificateManagementDAOFactory.init(daoExceptionDatasource);
         CertificateManagementServiceImpl instance1 = CertificateManagementServiceImpl.getInstance();
-        instance1.getAllCertificates(1, 2);
+        CertificatePaginationRequest request = new CertificatePaginationRequest(0, 2);
+        instance.getAllCertificates(request);
     }
 
     @Test(description = "This test case tests behaviour when data source transaction error occurs when removing the certificate"

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/test/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/CertificateManagementServiceImplTests.java

@@ -20,6 +20,7 @@ package io.entgra.device.mgt.core.certificate.mgt.core.impl;
 
 import io.entgra.device.mgt.core.certificate.mgt.core.util.CSRGenerator;
 import io.entgra.device.mgt.core.certificate.mgt.core.util.DummyCertificate;
+import io.entgra.device.mgt.core.device.mgt.common.CertificatePaginationRequest;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -217,7 +218,8 @@ public class CertificateManagementServiceImplTests extends BaseDeviceManagementC
     public void testGetAllCertificatesPaginated() throws CertificateManagementException, KeystoreException {
         managementService.generateX509Certificate();
         managementService.generateX509Certificate();
-        PaginationResult allCertificates = managementService.getAllCertificates(0, 2);
+        CertificatePaginationRequest request = new CertificatePaginationRequest(0,2);
+        PaginationResult allCertificates = managementService.getAllCertificates(request);
         Assert.assertEquals(allCertificates.getData().size(), 2);
         log.info("GetAllCertificatesPaginated Test Successful");
     }

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/test/resources/sql/h2.sql

@@ -37,6 +37,7 @@ CREATE TABLE IF NOT EXISTS DM_DEVICE_CERTIFICATE (
       SERIAL_NUMBER            VARCHAR(500) DEFAULT NULL,
     	CERTIFICATE                  BLOB DEFAULT NULL,
     	TENANT_ID INTEGER DEFAULT 0,
+        DEVICE_IDENTIFIER VARCHAR(300),
     	USERNAME  VARCHAR(500) DEFAULT NULL,
     	PRIMARY KEY (ID)
 );

components/device-mgt/io.entgra.device.mgt.core.device.mgt.common/src/main/java/io/entgra/device/mgt/core/device/mgt/common/CertificatePaginationRequest.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.device.mgt.common;
+
+public class CertificatePaginationRequest {
+    private int startIndex;
+    private int rowCount;
+    private String serialNumber;
+    private String deviceIdentifier;
+    private String username;
+
+    public CertificatePaginationRequest(int start, int rowCount) {
+        this.startIndex = start;
+        this.rowCount = rowCount;
+    }
+
+    public int getStartIndex() {
+        return startIndex;
+    }
+
+    public void setStartIndex(int startIndex) {
+        this.startIndex = startIndex;
+    }
+
+    public int getRowCount() {
+        return rowCount;
+    }
+
+    public void setRowCount(int rowCount) {
+        this.rowCount = rowCount;
+    }
+
+    public String getSerialNumber() {
+        return serialNumber;
+    }
+
+    public void setSerialNumber(String serialNumber) {
+        this.serialNumber = serialNumber;
+    }
+
+    public String getDeviceIdentifier() {
+        return deviceIdentifier;
+    }
+
+    public void setDeviceIdentifier(String deviceIdentifier) {
+        this.deviceIdentifier = deviceIdentifier;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    @Override
+    public String toString() {
+        return "Certificate serial number '" + this.serialNumber + "' num of rows: " + this.rowCount + " start index: " + this.startIndex;
+    }
+}