Made TenantNameStrategyType as Enum

common/data/src/main/java/org/thingsboard/server/common/data/oauth2/OAuth2BasicMapperConfig.java

@@ -10,7 +10,7 @@ public class OAuth2BasicMapperConfig {
     private final String emailAttributeKey;
     private final String firstNameAttributeKey;
     private final String lastNameAttributeKey;
-    private final String tenantNameStrategy;
+    private final TenantNameStrategyType tenantNameStrategy;
     private final String tenantNamePattern;
     private final String customerNamePattern;
     private final String defaultDashboardName;

common/data/src/main/java/org/thingsboard/server/common/data/oauth2/TenantNameStrategyType.java

@@ -0,0 +1,5 @@
+package org.thingsboard.server.common.data.oauth2;
+
+public enum TenantNameStrategyType {
+    DOMAIN, EMAIL, CUSTOM;
+}

dao/src/main/java/org/thingsboard/server/dao/model/sql/OAuth2ClientRegistrationEntity.java

@@ -78,8 +78,9 @@ public class OAuth2ClientRegistrationEntity extends BaseSqlEntity<OAuth2ClientRe
     private String firstNameAttributeKey;
     @Column(name = ModelConstants.OAUTH2_LAST_NAME_ATTRIBUTE_KEY_PROPERTY)
     private String lastNameAttributeKey;
+    @Enumerated(EnumType.STRING)
     @Column(name = ModelConstants.OAUTH2_TENANT_NAME_STRATEGY_PROPERTY)
-    private String tenantNameStrategy;
+    private TenantNameStrategyType tenantNameStrategy;
     @Column(name = ModelConstants.OAUTH2_TENANT_NAME_PATTERN_PROPERTY)
     private String tenantNamePattern;
     @Column(name = ModelConstants.OAUTH2_CUSTOMER_NAME_PATTERN_PROPERTY)