Adding SpringUserAdapter and making it implement UserDetails. User class is now free of Spring, Adapter takes care about that.

Author: jacekbilski

app/src/main/java/com/webcalc/billing/BillingController.java

@@ -1,5 +1,6 @@
 package com.webcalc.billing;
 
+import com.webcalc.user.SpringUserAdapter;
 import com.webcalc.user.User;
 import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -19,6 +20,7 @@ public BillingController(Billing billing) {
   @GetMapping("/balance")
   public String getBalance(HttpServletRequest request) {
     Authentication auth = (Authentication) request.getUserPrincipal();
-    return billing.getBalance(((User) auth.getPrincipal()).id).toPlainString();
+    User user = ((SpringUserAdapter) auth.getPrincipal()).getUser();
+    return billing.getBalance(user.id).toPlainString();
   }
 }

app/src/main/java/com/webcalc/calculator/CalculatorController.java

@@ -1,5 +1,6 @@
 package com.webcalc.calculator;
 
+import com.webcalc.user.SpringUserAdapter;
 import com.webcalc.user.User;
 import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -26,7 +27,8 @@ public String calculate(@RequestBody String body, HttpSession session, HttpServl
     if (session.getAttribute(MAX_FRACTION_DIGITS) == null)
       session.setAttribute(MAX_FRACTION_DIGITS, Calculator.DEFAULT_MAX_FRACTION_DIGITS);
     Authentication auth = (Authentication) request.getUserPrincipal();
-    return calculator.eval(((User) auth.getPrincipal()).id, body, (Integer) session.getAttribute(MAX_FRACTION_DIGITS));
+    User user = ((SpringUserAdapter) auth.getPrincipal()).getUser();
+    return calculator.eval(user.id, body, (Integer) session.getAttribute(MAX_FRACTION_DIGITS));
   }
 
   @PutMapping("/maxFractionDigits")

app/src/main/java/com/webcalc/user/SpringUserAdapter.java

@@ -0,0 +1,56 @@
+package com.webcalc.user;
+
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import java.util.Collection;
+
+import static java.util.Collections.emptyList;
+
+public class SpringUserAdapter implements UserDetails {
+
+  private final User user;
+
+  public SpringUserAdapter(User user) {
+    this.user = user;
+  }
+
+  public User getUser() {
+    return user;
+  }
+
+  @Override
+  public Collection<? extends GrantedAuthority> getAuthorities() {
+    return emptyList();
+  }
+
+  @Override
+  public String getPassword() {
+    return user.getPassword();
+  }
+
+  @Override
+  public String getUsername() {
+    return user.getUsername();
+  }
+
+  @Override
+  public boolean isAccountNonExpired() {
+    return true;
+  }
+
+  @Override
+  public boolean isAccountNonLocked() {
+    return true;
+  }
+
+  @Override
+  public boolean isCredentialsNonExpired() {
+    return true;
+  }
+
+  @Override
+  public boolean isEnabled() {
+    return true;
+  }
+}

app/src/main/java/com/webcalc/user/User.java

@@ -1,58 +1,24 @@
 package com.webcalc.user;
 
-import org.springframework.security.core.GrantedAuthority;
-import org.springframework.security.core.userdetails.UserDetails;
-
-import java.util.Collection;
 import java.util.UUID;
 
-public class User implements UserDetails {
+public class User {
 
   public final UUID id;
-
-  private final UserDetails springSecUser;
+  private final String username;
+  private final String password;
 
   public User(UUID id, String username, String password) {
     this.id = id;
-    springSecUser = org.springframework.security.core.userdetails.User.builder()
-        .username(username)
-        .password(password)
-        .roles()
-        .build();
-  }
-
-  @Override
-  public Collection<? extends GrantedAuthority> getAuthorities() {
-    return springSecUser.getAuthorities();
-  }
-
-  @Override
-  public String getPassword() {
-    return springSecUser.getPassword();
+    this.username = username;
+    this.password = password;
   }
 
-  @Override
   public String getUsername() {
-    return springSecUser.getUsername();
+    return username;
   }
 
-  @Override
-  public boolean isAccountNonExpired() {
-    return springSecUser.isAccountNonExpired();
-  }
-
-  @Override
-  public boolean isAccountNonLocked() {
-    return springSecUser.isAccountNonLocked();
-  }
-
-  @Override
-  public boolean isCredentialsNonExpired() {
-    return springSecUser.isCredentialsNonExpired();
-  }
-
-  @Override
-  public boolean isEnabled() {
-    return springSecUser.isEnabled();
+  public String getPassword() {
+    return password;
   }
 }

app/src/main/java/com/webcalc/user/WebCalcUserDetailsService.java

@@ -20,7 +20,7 @@ public class WebCalcUserDetailsService implements UserDetailsService {
   @Override
   public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
     if (users.containsKey(username))
-      return users.get(username);
+      return new SpringUserAdapter(users.get(username));
     throw new UsernameNotFoundException("User unknown");
   }
 }