introduce Context service

src/main/java/net/hostsharing/hsadminng/config/PostgreSQL95CustomDialect.java

@@ -0,0 +1,13 @@
+package net.hostsharing.hsadminng.config;
+
+import com.vladmihalcea.hibernate.type.array.StringArrayType;
+import org.hibernate.dialect.PostgreSQL95Dialect;
+
+@SuppressWarnings("unused") // configured in application.yml
+public class PostgreSQL95CustomDialect extends PostgreSQL95Dialect {
+
+    public PostgreSQL95CustomDialect() {
+        this.registerHibernateType(2003, StringArrayType.class.getName());
+    }
+
+}

src/main/java/net/hostsharing/hsadminng/context/Context.java

@@ -0,0 +1,51 @@
+package net.hostsharing.hsadminng.context;
+
+import org.springframework.stereotype.Service;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.transaction.Transactional;
+
+@Service
+public class Context {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional(Transactional.TxType.MANDATORY)
+    public void setCurrentUser(final String userName) {
+        em.createNativeQuery(
+            String.format(
+                "set local hsadminng.currentUser = '%s';",
+                userName
+            )
+        ).executeUpdate();
+        assumeNoSpecialRole();
+    }
+
+    public String getCurrentUser() {
+        return String.valueOf(em.createNativeQuery("select currentUser()").getSingleResult());
+    }
+
+    @Transactional(Transactional.TxType.MANDATORY)
+    public void assumeRoles(final String roles) {
+        em.createNativeQuery(
+            String.format(
+                "set local hsadminng.assumedRoles = '%s';",
+                roles
+            )
+        ).executeUpdate();
+    }
+
+    @Transactional(Transactional.TxType.MANDATORY)
+    public void assumeNoSpecialRole() {
+        em.createNativeQuery(
+            "set local hsadminng.assumedRoles = '';"
+        ).executeUpdate();
+    }
+
+    public String[] getAssumedRoles() {
+        return (String[]) em.createNativeQuery("select assumedRoles()").getSingleResult();
+    }
+
+}

src/main/java/net/hostsharing/hsadminng/controller/TestController.java

@@ -1,5 +1,7 @@
-package net.hostsharing.hsadminng;
+package net.hostsharing.hsadminng.controller;
 
+import net.hostsharing.hsadminng.context.Context;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
@@ -15,6 +17,9 @@ public class TestController {
     @PersistenceContext
     private EntityManager em;
 
+    @Autowired
+    private Context context;
+
     @ResponseBody
     @RequestMapping(value = "/api/ping", method = RequestMethod.GET)
     public String ping() {
@@ -25,8 +30,8 @@ public class TestController {
     @ResponseBody
     @RequestMapping(value = "/api/currentUser", method = RequestMethod.GET)
     public String currentUser() {
-        em.createNativeQuery("SET LOCAL hsadminng.currentUser = 'mike@hostsharing.net';").executeUpdate();
-        em.createNativeQuery("SET LOCAL hsadminng.assumedRoles = '';").executeUpdate();
+        context.setCurrentUser("mike@hostsharing.net");
+
         final var query = em.createNativeQuery("select currentUser()");
         return query.getSingleResult() + "\n";
     }

src/main/resources/application.yml

@@ -1,14 +1,19 @@
 spring:
 
-  datasource:
-    driver-class-name: org.postgresql.Driver
-    password: password
-    url: jdbc:postgresql://localhost:5432/postgres
-    username: postgres
+    datasource:
+        driver-class-name: org.postgresql.Driver
+        password: password
+        url: jdbc:postgresql://localhost:5432/postgres
+        username: postgres
 
-  sql:
-    init:
-      mode: never
+    sql:
+        init:
+            mode: never
+
+    jpa:
+        properties:
+            hibernate:
+                dialect: net.hostsharing.hsadminng.config.PostgreSQL95CustomDialect
 
 liquibase:
     contexts: dev