Allow plugging-in any provided LoginStrategy

Support dynamic loading of provided implementations of PORTAL SDK's 
`org.onap.portalsdk.core.auth.LoginStrategy` interface.

VID will load the class defined by `login.strategy.classname`
configuration parameter. Default will keep current ONAP's dev login.

Change-Id: I956a1f3376455211398769f3193703129b779871
Issue-ID: VID-594
Signed-off-by: Ittay Stern <ittay.stern@att.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/epsdk-app-onap/src/main/java/org/onap/portalapp/conf/ExternalAppConfig.java b/epsdk-app-onap/src/main/java/org/onap/portalapp/conf/ExternalAppConfig.java
index b4dcd346a..d9b0f092e 100644
--- a/epsdk-app-onap/src/main/java/org/onap/portalapp/conf/ExternalAppConfig.java
+++ b/epsdk-app-onap/src/main/java/org/onap/portalapp/conf/ExternalAppConfig.java
@@ -37,6 +37,8 @@
  */
 package org.onap.portalapp.conf;
 
+import static org.apache.commons.lang3.StringUtils.isNotEmpty;
+
 import java.util.ArrayList;
 import java.util.List;
 import javax.sql.DataSource;
@@ -50,6 +52,7 @@ import org.onap.portalsdk.core.objectcache.AbstractCacheManager;
 import org.onap.portalsdk.core.service.DataAccessService;
 import org.onap.portalsdk.core.util.CacheManager;
 import org.onap.portalsdk.core.util.SystemProperties;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
@@ -164,8 +167,15 @@ public class ExternalAppConfig extends AppConfig implements Configurable {
 	}
 
 	@Bean
-	public LoginStrategy loginStrategy() {
-		return new LoginStrategyImpl();
+	public LoginStrategy loginStrategy(@Value("${login.strategy.classname:}") String classname) throws ReflectiveOperationException {
+		return isNotEmpty(classname) ?
+			newLoginStrategyInstance(classname) : new LoginStrategyImpl();
+	}
+
+	private LoginStrategy newLoginStrategyInstance(String loginStrategyClassname) throws ReflectiveOperationException {
+		return (LoginStrategy) Class.forName(loginStrategyClassname)
+			.getConstructor()
+			.newInstance();
 	}
 
 	@Bean