Issue #24: Erste Implementierung eines PermissionEvaluators

Diese erste Implementierung wertet die Zugriffsberechtigung auf den Personenstamm
aus, in dem der Patient oder eines der Formulare zum Patienten gehört.

4 files changed, 98 insertions, 0 deletions

diff --git a/pom.xml b/pom.xml
index cd7d802..0f7ffdb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -14,6 +14,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
         <spring-version>4.3.8.RELEASE</spring-version>
+        <spring-security-version>4.2.2.RELEASE</spring-security-version>
     </properties>
 
     <dependencies>
@@ -56,6 +57,12 @@
             <scope>provided</scope>
         </dependency>
         <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-core</artifactId>
+            <version>${spring-security-version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
             <groupId>org.springframework.data</groupId>
             <artifactId>spring-data-jpa</artifactId>
             <version>1.2.0.RELEASE</version>
diff --git a/src/main/java/DNPM/config/PluginConfiguration.java b/src/main/java/DNPM/config/PluginConfiguration.java
index 30d8fb3..654d4c4 100644
--- a/src/main/java/DNPM/config/PluginConfiguration.java
+++ b/src/main/java/DNPM/config/PluginConfiguration.java
@@ -1,6 +1,7 @@
 package DNPM.config;
 
 import DNPM.database.SettingsRepository;
+import DNPM.security.PersonPoolBasedPermissionEvaluator;
 import DNPM.services.*;
 import DNPM.services.consent.ConsentManagerServiceFactory;
 import DNPM.services.mtb.DefaultMtbService;
@@ -12,6 +13,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.security.access.PermissionEvaluator;
 
 import javax.sql.DataSource;
 
@@ -26,6 +28,11 @@ import javax.sql.DataSource;
 public class PluginConfiguration {
 
     @Bean
+    public PermissionEvaluator personBasedPermissionEvaluator(final DataSource dataSource) {
+        return new PersonPoolBasedPermissionEvaluator(dataSource);
+    }
+
+    @Bean
     public FormService formService(final DataSource dataSource) {
         return new DefaultFormService(dataSource);
     }
diff --git a/src/main/java/DNPM/security/PermissionType.java b/src/main/java/DNPM/security/PermissionType.java
new file mode 100644
index 0000000..50a0bd3
--- /dev/null
+++ b/src/main/java/DNPM/security/PermissionType.java
@@ -0,0 +1,6 @@
+package DNPM.security;
+
+public enum PermissionType {
+    READ,
+    WRITE
+}
diff --git a/src/main/java/DNPM/security/PersonPoolBasedPermissionEvaluator.java b/src/main/java/DNPM/security/PersonPoolBasedPermissionEvaluator.java
new file mode 100644
index 0000000..766cc70
--- /dev/null
+++ b/src/main/java/DNPM/security/PersonPoolBasedPermissionEvaluator.java
@@ -0,0 +1,78 @@
+package DNPM.security;
+
+import de.itc.onkostar.api.Patient;
+import de.itc.onkostar.api.Procedure;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.security.access.PermissionEvaluator;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import javax.sql.DataSource;
+import java.io.Serializable;
+import java.util.List;
+
+/**
+ * Permission-Evaluator zur Auswertung der Berechtigung auf Objekte aufgrund der Personenstammberechtigung
+ */
+public class PersonPoolBasedPermissionEvaluator implements PermissionEvaluator {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    public PersonPoolBasedPermissionEvaluator(final DataSource dataSource) {
+        this.jdbcTemplate = new JdbcTemplate(dataSource);
+    }
+
+    /**
+     * Auswertung der Zugriffsberechtigung für authentifizierten Benutzer auf Zielobjekt mit angeforderter Berechtigung.
+     * @param authentication Das Authentication Objekt
+     * @param targetObject Das Zielobjekt
+     * @param permissionType Die angeforderte Berechtigung
+     * @return Gibt <code>true</code> zurück, wenn der Benutzer die Berechtigung hat
+     */
+    @Override
+    public boolean hasPermission(Authentication authentication, Object targetObject, Object permissionType) {
+        if (permissionType instanceof PermissionType) {
+            if (targetObject instanceof Patient) {
+                return getPersonPoolIdsForPermission(authentication, (PermissionType)permissionType)
+                        .contains(((Patient)targetObject).getPersonPoolCode());
+            } else if (targetObject instanceof Procedure) {
+                return getPersonPoolIdsForPermission(authentication, (PermissionType)permissionType)
+                        .contains(((Procedure)targetObject).getPatient().getPersonPoolCode());
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Auswertung nicht anhand der ID möglich. Gibt immer <code>false</code> zurück.
+     * @param authentication Authentication-Object
+     * @param targetId ID des Objekts
+     * @param s
+     * @param o
+     * @return Gibt immer <code>false</code> zurück
+     */
+    @Override
+    public boolean hasPermission(Authentication authentication, Serializable targetId, String s, Object o) {
+        return false;
+    }
+
+    private List<String> getPersonPoolIdsForPermission(Authentication authentication, PermissionType permissionType) {
+        var sql = "SELECT p.kennung FROM personenstamm_zugriff " +
+                " JOIN usergroup u ON personenstamm_zugriff.benutzergruppe_id = u.id " +
+                " JOIN akteur_usergroup au ON u.id = au.usergroup_id " +
+                " JOIN akteur a ON au.akteur_id = a.id " +
+                " JOIN personenstamm p on personenstamm_zugriff.personenstamm_id = p.id " +
+                " WHERE a.login = ? AND a.aktiv AND a.anmelden_moeglich ";
+
+        if (PermissionType.WRITE == permissionType) {
+            sql += " AND personenstamm_zugriff.bearbeiten ";
+        }
+
+        var userDetails = (UserDetails)authentication.getPrincipal();
+
+        return jdbcTemplate
+                .query(sql, new Object[]{userDetails.getUsername()}, (rs, rowNum) -> rs.getString("id"));
+    }
+
+
+}