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on November 02, 2020

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Using TestContainers for Integration Tests

Background: In CentralCoding service, BDD tests will rely on another database instance. Since there will be a lot of data get imported each time, there's a need to avoid unnecessary cost by using TestContainers. What is TestContainers TestContainers is a java library that provides functionality to handle a docker container. You can start any container by using the GenericContainer with any docker image, one of the specialized containers(e.g PostgresSqlContainer) provided by a module, or by programmatically creating your own image on the fly. TestContainers also ensures that application inside the container is started and ready to use, by providing a WaitStrategy. Dependency: Make sure you have docker installed in your local development. < dependency > < groupId >org.junit.jupiter</groupId> < artifactId >junit-jupiter</artifactId> < version > 5.8.1 </version> < scope >test</...

How to Secure Your Java Application with SSL Certificates for Java Keystore and AWS ALB

In today’s world, secure communication is a must, but not every developer has had the opportunity to work with SSL/TLS certificates directly. In this guide, I’ll walk you through the process of obtaining and setting up an SSL certificate for both the Java Keystore and AWS Application Load Balancer (ALB). Step 1: Request a Certificate The first step to secure communication is requesting an SSL certificate. This requires generating a Certificate Signing Request (CSR), which your Certificate Authority (CA) will use to issue the certificate. To create a .csr file, run the following openssl command: openssl req -newkey rsa:2048 -keyout private_key.pem -out new_cert.csr This will create a private_key.pem file (your private key, which must be kept secure) and new_cert.csr . Submit new_cert.csr to your cloud team or directly to your CA, such as DigiCert, and they will provide you with the certificate files. Typically, you’ll receive files like: certificate.crt – Your main certificate...

Multi-Tenancy with PostgreSQL RLS

RLS, row level security, is a postgreSQL feature to define policies to control how specific rows of data display, in essence, it's an additional filter to apply to a PostgreSQL database table. Add discriminator column(s) < changeSet id ="add-tenancy-id" > < addColumn tableName ="Test_Table" > < column name ="Tenant_Id" type ="VARCHAR(30)" defaultValue ="0" > < constrains nullable ="false" /> </ column > </ addColumn > </ changeSet > Define row level policies < changeSet id ="Test_row_level_security" > < sql dbms ="postgresql" splitStatements ="true" > ALTER TABLE TEST_TABLE ENABLE ROW LEVEL SECURITY; DROP POLICY IF EXISTS TEST_tenant_isolation_policy ON TEST_TABLE; CREATE POLICY TEST_tenant_isolation_policy ON TEST_TABLE USING (tenant_id = current_setting('app.tena...

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