Bug/several credentials for device (#3089)

* fix for device credentials

* fix in validateCreate

dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java

@@ -84,7 +84,8 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
             return deviceCredentialsDao.save(tenantId, deviceCredentials);
         } catch (Exception t) {
             ConstraintViolationException e = extractConstraintViolationException(t).orElse(null);
-            if (e != null && e.getConstraintName() != null && e.getConstraintName().equalsIgnoreCase("device_credentials_id_unq_key")) {
+            if (e != null && e.getConstraintName() != null
+                    && (e.getConstraintName().equalsIgnoreCase("device_credentials_id_unq_key") || e.getConstraintName().equalsIgnoreCase("device_credentials_device_id_unq_key"))) {
                 throw new DataValidationException("Specified credentials are already registered!");
             } else {
                 throw t;
@@ -111,14 +112,23 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
 
                 @Override
                 protected void validateCreate(TenantId tenantId, DeviceCredentials deviceCredentials) {
+                    if (deviceCredentialsDao.findByDeviceId(tenantId, deviceCredentials.getDeviceId().getId()) != null) {
+                        throw new DataValidationException("Credentials for this device are already specified!");
+                    }
+                    if (deviceCredentialsDao.findByCredentialsId(tenantId, deviceCredentials.getCredentialsId()) != null) {
+                        throw new DataValidationException("Device credentials are already assigned to another device!");
+                    }
                 }
 
                 @Override
                 protected void validateUpdate(TenantId tenantId, DeviceCredentials deviceCredentials) {
-                    DeviceCredentials existingCredentials = deviceCredentialsDao.findById(tenantId, deviceCredentials.getUuidId());
+                    if (deviceCredentialsDao.findById(tenantId, deviceCredentials.getUuidId()) == null) {
-                    if (existingCredentials == null) {
                         throw new DataValidationException("Unable to update non-existent device credentials!");
                     }
+                    DeviceCredentials existingCredentials = deviceCredentialsDao.findByCredentialsId(tenantId, deviceCredentials.getCredentialsId());
+                    if (existingCredentials != null && !existingCredentials.getId().equals(deviceCredentials.getId())) {
+                        throw new DataValidationException("Device credentials are already assigned to another device!");
+                    }
                 }
 
                 @Override

dao/src/main/resources/sql/schema-entities-hsql.sql

@@ -142,7 +142,8 @@ CREATE TABLE IF NOT EXISTS device_credentials (
     credentials_type varchar(255),
     credentials_value varchar,
     device_id uuid,
-    CONSTRAINT device_credentials_id_unq_key UNIQUE (credentials_id)
+    CONSTRAINT device_credentials_id_unq_key UNIQUE (credentials_id),
+    CONSTRAINT device_credentials_device_id_unq_key UNIQUE (device_id)
 );
 
 CREATE TABLE IF NOT EXISTS event (

dao/src/main/resources/sql/schema-entities.sql

@@ -142,7 +142,8 @@ CREATE TABLE IF NOT EXISTS device_credentials (
     credentials_type varchar(255),
     credentials_value varchar,
     device_id uuid,
-    CONSTRAINT device_credentials_id_unq_key UNIQUE (credentials_id)
+    CONSTRAINT device_credentials_id_unq_key UNIQUE (credentials_id),
+    CONSTRAINT device_credentials_device_id_unq_key UNIQUE (device_id)
 );
 
 CREATE TABLE IF NOT EXISTS event (