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feat(user): add deterministic avatar color to AppUser

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Adds color field assigned from an 8-colour palette keyed on the user's UUID
hash (Math.abs(id.hashCode()) % 8). Fires via @PrePersist/@PreUpdate/@PostLoad
so both new and existing users get the correct colour at runtime.

V47 migration adds the column and fixes the V46 REVOKE bug that hardcoded
role name 'app_user' instead of CURRENT_USER.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-04-19 16:33:27 +02:00
committed by marcel
parent 6494b13147
commit 74febd37f6
3 changed files with 72 additions and 0 deletions
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26
backend/src/main/java/org/raddatz/familienarchiv/model/AppUser.java
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@@ -19,6 +19,10 @@ import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import jakarta.persistence.PostLoad;
import jakarta.persistence.PrePersist;
import jakarta.persistence.PreUpdate;
@Entity
@Table(name = "users")
@Data
@@ -74,6 +78,28 @@ public class AppUser {
@Schema(requiredMode = Schema.RequiredMode.REQUIRED)
private LocalDateTime createdAt;
@Column(nullable = false)
@Builder.Default
@Schema(requiredMode = Schema.RequiredMode.REQUIRED)
private String color = "";
private static final String[] PALETTE = {
"#7a4f9a", "#5a8a6a", "#3060b0", "#a0522d", "#c0446e", "#c17a00", "#0e7490", "#1d4ed8"
};
public static String computeColor(UUID id) {
return PALETTE[Math.abs(id.hashCode()) % PALETTE.length];
}
@PrePersist
@PreUpdate
@PostLoad
void deriveColor() {
if (id != null && (color == null || color.isEmpty())) {
this.color = computeColor(id);
}
}
public boolean hasPermission(String permission) {
if (groups == null || groups.isEmpty()) {
return false;

8
backend/src/main/resources/db/migration/V47__add_user_color.sql Normal file
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@@ -0,0 +1,8 @@
-- Add deterministic avatar color to app_users.
-- Assigned at application layer (AppUser.java) from a fixed 8-colour palette.
-- Also corrects V46's REVOKE which hardcoded 'app_user' instead of CURRENT_USER.
ALTER TABLE app_users ADD COLUMN color VARCHAR(20) NOT NULL DEFAULT '';
-- Fix V46 append-only enforcement for the actual application role.
REVOKE UPDATE, DELETE ON audit_log FROM CURRENT_USER;

38
backend/src/test/java/org/raddatz/familienarchiv/model/AppUserTest.java Normal file
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@@ -0,0 +1,38 @@
package org.raddatz.familienarchiv.model;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.UUID;
import static org.assertj.core.api.Assertions.assertThat;
class AppUserTest {
private static final List<String> EXPECTED_PALETTE = List.of(
"#7a4f9a", "#5a8a6a", "#3060b0", "#a0522d", "#c0446e", "#c17a00", "#0e7490", "#1d4ed8"
);
@Test
void computeColor_returnsDeterministicPaletteColor() {
UUID id = UUID.fromString("12345678-1234-1234-1234-123456789abc");
String color = AppUser.computeColor(id);
assertThat(EXPECTED_PALETTE).contains(color);
assertThat(AppUser.computeColor(id)).isEqualTo(color);
}
@Test
void computeColor_isStableAcrossCalls() {
UUID id = UUID.randomUUID();
assertThat(AppUser.computeColor(id)).isEqualTo(AppUser.computeColor(id));
}
@Test
void computeColor_variesAcrossDifferentIds() {
long distinct = java.util.stream.IntStream.range(0, 100)
.mapToObj(i -> AppUser.computeColor(UUID.randomUUID()))
.distinct()
.count();
assertThat(distinct).isGreaterThan(1);
}
}