2 files changed, 135 insertions, 0 deletions
diff --git a/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/CachingPasswordEncoder.java b/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/CachingPasswordEncoder.java
new file mode 100644
index 00000000..672ebb5e
--- /dev/null
+++ b/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/CachingPasswordEncoder.java
@@ -0,0 +1,81 @@
+package at.gv.egiz.eaaf.utils.springboot.utils;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * Decorator for {@link PasswordEncoder} that caches valid password to speed-up password verification.
+ * 
+ * @author tlenz
+ *
+ */
+@Slf4j
+@AllArgsConstructor
+public class CachingPasswordEncoder implements PasswordEncoder {
+
+  /**
+   * Cryptographic password encoder. 
+   */
+  private final PasswordEncoder internalEncoder;     
+  
+  /**
+   * Look-up table to speed-up password validation on REST API's.
+   */
+  private final Map<String, String> passwordCache = new ConcurrentHashMap<>(10);
+  
+  @Override
+  public String encode(CharSequence rawPassword) {
+    log.trace("Delegate password encoding to: {}", internalEncoder.getClass().getName());
+    return internalEncoder.encode(rawPassword);
+    
+  }
+
+  @Override
+  public boolean matches(CharSequence rawPassword, String encodedPassword) {
+    
+    if (passwordCache.containsKey(rawPassword.toString())) {
+      log.trace("Find password in cache. Starting verification ... ");
+      String cachedPassword = passwordCache.get(rawPassword).toString();
+      if (equalsNoEarlyReturn(cachedPassword, encodedPassword)) {        
+        return true;
+        
+      }
+    }
+    
+    return checkPasswordAndUpdateCache(rawPassword, encodedPassword);
+            
+  }
+  
+  @Override
+  public boolean upgradeEncoding(String encodedPassword) {
+    return internalEncoder.upgradeEncoding(encodedPassword);
+    
+  }
+  
+  
+  private boolean checkPasswordAndUpdateCache(CharSequence rawPassword, String encodedPassword) {
+    log.trace("Password not cached. Starting password processing ... ");
+    boolean passwordValid = internalEncoder.matches(rawPassword, encodedPassword);
+    if (passwordValid) {
+      log.debug("Get valid password. Cached it for faster reusage");
+      passwordCache.put(rawPassword.toString(), encodedPassword);
+      
+    } 
+    
+    return passwordValid;
+                
+  }
+
+  static boolean equalsNoEarlyReturn(String a, String b) {
+    return MessageDigest.isEqual(a.getBytes(StandardCharsets.UTF_8), b.getBytes(StandardCharsets.UTF_8));
+    
+  }
+
+}
diff --git a/eaaf-springboot-utils/src/test/java/at/gv/egiz/eaaf/utils/springboot/test/utils/CachingPasswordEncoderTest.java b/eaaf-springboot-utils/src/test/java/at/gv/egiz/eaaf/utils/springboot/test/utils/CachingPasswordEncoderTest.java
new file mode 100644
index 00000000..bae19cac
--- /dev/null
+++ b/eaaf-springboot-utils/src/test/java/at/gv/egiz/eaaf/utils/springboot/test/utils/CachingPasswordEncoderTest.java
@@ -0,0 +1,54 @@
+package at.gv.egiz.eaaf.utils.springboot.test.utils;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import org.apache.commons.lang3.RandomStringUtils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.BlockJUnit4ClassRunner;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+import at.gv.egiz.eaaf.utils.springboot.utils.CachingPasswordEncoder;
+
+@RunWith(BlockJUnit4ClassRunner.class)
+public class CachingPasswordEncoderTest {
+
+  PasswordEncoder orgEncoder = new BCryptPasswordEncoder();
+  PasswordEncoder testEncoder = new CachingPasswordEncoder(orgEncoder);
+  
+  @Test
+  public void upgradeEncoding() {    
+    String enc = new BCryptPasswordEncoder().encode(RandomStringUtils.randomAlphabetic(5));
+            
+    assertEquals("upgradeEncoding",
+        orgEncoder.upgradeEncoding(enc),
+        testEncoder.upgradeEncoding(enc));
+    
+  }
+  
+  @Test
+  public void encodePassword() {    
+    String plain = RandomStringUtils.randomAlphabetic(5);    
+    assertNotNull("password encoded", testEncoder.encode(plain));
+    
+  }
+  
+  @Test
+  public void matchPassword() {        
+    String plain = RandomStringUtils.randomAlphabetic(5);
+    String encoded = testEncoder.encode(plain);
+    
+    assertTrue("valid password", testEncoder.matches(plain, encoded));
+    assertTrue("valid password again", testEncoder.matches(plain, encoded));        
+            
+    assertFalse("password in cache, but changed on server", 
+        testEncoder.matches(plain, RandomStringUtils.randomAlphabetic(10)));
+    assertFalse("wrong password send", testEncoder.matches(RandomStringUtils.randomAlphabetic(5), encoded));
+    
+  }
+  
+}