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diff --git a/21-implementierungsheft-kolloquium/assets/diagrams/classdiagram-authentication.puml b/21-implementierungsheft-kolloquium/assets/diagrams/classdiagram-authentication.puml
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+@startuml
+
+package authenticationAPI <<Frame>> {
+    package authenticationDataAccessLayer <<Frame>> {
+        ' interface AuthenticationDao {
+        '     String login(String username)
+        '     int logout(String username)
+        ' }
+        
+        ' class AuthenticationDataAccessService <<@Respository>> {
+        '     <<create>> AuthenticationDataAccessService(JpaTemplate jpaTemplate)
+        '     String login(String username)
+        '     int logout(String username)
+        ' }
+
+        interface UserDetailsManager {
+            void createUser(UserDetails userDetails)
+            void changePassword(String oldPassword, String newPassword)
+            void deleteUser(String username)
+            void updateUser(UserDetails user)
+            boolean userExists(String username)
+        }
+        note left 
+            Aus org.springframework.security.provisioning
+            - liefert Methoden zum Erstellen neuer User
+            und zum Aktualisieren bestehender.
+        end note
+
+        class JdbcUserDetailsManager <<@Repository>> {
+            <<create>> JdbcUserDetailsManager(DataSource dataSource)
+            void createUser(UserDetails user)
+            void changePassword(String oldPassword, String newPassword)
+            void deleteUser(String username)
+            void updateUser(UserDetails user)
+            boolean userExists(String username)
+        }
+        note right
+            User Management Service aus dem Paket
+            org.springframework.security.provisioning
+            der CRUD Operationen für User bereitstellt.
+            Hier sind nur die relevanten Methoden modelliert.
+        end note
+    }
+
+    package authenticationService <<Frame>> {
+        class AuthenticationService <<@Service>> {
+            --
+            <<create>> AuthenticationService(UserDetailsManager userDetailsManager)
+            List<String> verifyLogin(String username)
+            int logout(String username)
+            int forgotPassword(ForgotPasswordRequest forgotPasswordRequest)
+            .. via JdbcUserDetailsManager ..
+            int resetPassword(String username, RequestWithPassword requestWithPassword)
+            int registerUser(UserDetails user)
+            int changePassword(String username, ChangePasswordRequest changePasswordRequest)
+            int deleteUser(String username, RequestWithPassword requestWithPassword)
+        }
+        
+        class JavaMailSenderImpl {}
+        note left
+            Aus org.springframework.mail.javamail.
+            Implementierung des JavaMailSender Interfaces,
+            welches das MailSender Interface durch Unterstützung
+            von MIME Nachrichten erweitert.
+            Das MailSender Interface definiert dabei eine
+            Strategie zum Versenden einfacher Mails.
+            Unterstützt sowohl JavaMail MimeMessages und
+            Spring SimpleMailMessages.
+        end note
+    }
+
+    package authenticationController <<Frame>> {
+        class AuthenticationController <<@Controller>> {
+            <<create>> AuthenticationController(AuthenticationService authenticationService)
+            ResponseEntity<List<String>> verifyLogin(String username)
+            ResponseEntity<Integer> logout(String username)
+            ResponseEntity<Integer> forgotPassword(ForgotPasswordRequest forgotPasswordRequest)
+            ResponseEntity<Integer> resetPassword(String username, RequestWithPassword requestWithPassword)
+            ResponseEntity<Integer> registerUser(UserDetails user)
+            ResponseEntity<Integer> changePassword(String username, ChangePasswordRequest changePasswordRequest)
+            ResponseEntity<Integer> deleteUser(String username, RequestWithPassword requestWithPassword)
+        }
+
+        class ChangePasswordRequest {
+            <<create>> ChangePasswordRequest(String oldPassword, String newPassword)
+            String getOldPassword()
+            String getNewPassword()
+        }
+
+        class ForgotPasswordRequest {
+            <<create>> ForgotPasswordRequest(String email)
+            String getEmail()
+        }
+
+        class RequestWithPassword {
+            <<create>> ResetPasswordRequest(String password)
+            String getPassword()
+        }
+    }
+}
+
+' User <.. AuthenticationDataAccessService: DB
+' User <.. JdbcUserDetailsManager: DB
+UserDetailsManager <.. AuthenticationService: <<use>>
+' AuthenticationDao <.. AuthenticationService: <<use>>
+AuthenticationService --o AuthenticationController
+' AuthenticationDao <|. AuthenticationDataAccessService: <<realize>>
+UserDetailsManager <|. JdbcUserDetailsManager: <<realize>>
+JavaMailSenderImpl <. AuthenticationService: <<use>>
+
+@enduml
+