Add JWT-based security and /me endpoint

Introduced JWT-based authentication with role handling using Keycloak. Added the `/me` endpoint to return user information and roles. Configured testing, Keycloak integration, and public-facing `/public/info` endpoint enhancements.

src/main/java/se/urmo/hemhub/config/KeycloakRealmRoleConverter.java

@@ -0,0 +1,60 @@
+package se.urmo.hemhub.config;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.oauth2.jwt.Jwt;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class KeycloakRealmRoleConverter implements Converter<Jwt, Collection<GrantedAuthority>> {
+
+    @Override
+    public Collection<GrantedAuthority> convert(Jwt jwt) {
+        // realm_access.roles (Keycloak)
+        var realmRoles = extractRoles(jwt.getClaim("realm_access"), "roles");
+
+        // (valfritt) resource_access.<client>.roles — plocka även klientroller om du vill
+        var resourceAccess = jwt.getClaim("resource_access");
+        var clientRoles = new ArrayList<String>();
+        if (resourceAccess instanceof Map<?,?> ra) {
+            ra.values().forEach(v -> clientRoles.addAll(extractRoles(v, "roles")));
+        }
+
+        // scope/scp (standard i Spring): "read write" eller ["read","write"]
+        var scopeRoles = new ArrayList<String>();
+        Object scope = Optional.ofNullable(jwt.getClaims().get("scope"))
+                .orElse(jwt.getClaims().get("scp"));
+        if (scope instanceof String s) {
+            scopeRoles.addAll(Arrays.asList(s.split("\\s+")));
+        } else if (scope instanceof Collection<?> c) {
+            c.forEach(x -> scopeRoles.add(String.valueOf(x)));
+        }
+
+        // Samla ihop och prefixa ROLE_
+        return Stream.of(realmRoles, clientRoles, scopeRoles)
+                .flatMap(Collection::stream)
+                .filter(Objects::nonNull)
+                .map(String::valueOf)
+                .filter(s -> !s.isBlank())
+                .distinct()
+                .map(r -> r.startsWith("ROLE_") ? r : "ROLE_" + r)
+                .map(SimpleGrantedAuthority::new)
+                .collect(Collectors.toSet());
+    }
+
+    /**
+     * Hjälpmetod som läser en lista av roller från en otypad struktur:
+     * förväntar sig t.ex. { "roles": ["OWNER","MEMBER"] }
+     */
+    private static List<String> extractRoles(Object container, String key) {
+        if (!(container instanceof Map<?,?> m)) return List.of();
+        Object raw = m.get(key);
+        if (raw instanceof Collection<?> c) {
+            return c.stream().map(String::valueOf).toList();
+        }
+        return List.of();
+    }
+}

src/main/java/se/urmo/hemhub/config/SecurityConfig.java

@@ -0,0 +1,45 @@
+package se.urmo.hemhub.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Configuration
+@EnableMethodSecurity
+public class SecurityConfig {
+
+    @Bean
+    SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        http
+                .csrf(csrf -> csrf.disable())
+                .authorizeHttpRequests(auth -> auth
+                        .requestMatchers(
+                                "/public/**",
+                                "/actuator/health", "/actuator/info",
+                                "/v3/api-docs/**", "/swagger-ui/**", "/swagger-ui.html"
+                        ).permitAll()
+                        .anyRequest().authenticated()
+                )
+                .oauth2ResourceServer(oauth -> oauth.jwt(jwt -> jwt.jwtAuthenticationConverter(jwtConverter())));
+        return http.build();
+    }
+
+    @Bean
+    JwtAuthenticationConverter jwtConverter() {
+        var converter = new JwtAuthenticationConverter();
+        converter.setJwtGrantedAuthoritiesConverter(new KeycloakRealmRoleConverter());
+        return converter;
+    }
+}
+

src/main/java/se/urmo/hemhub/web/MeController.java

@@ -0,0 +1,45 @@
+package se.urmo.hemhub.web;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.*;
+
+@RestController
+public class MeController {
+
+    @GetMapping("/me")
+    public Map<String, Object> me(Authentication auth) {
+        if (auth == null || !(auth.getPrincipal() instanceof Jwt jwt)) {
+            throw new IllegalStateException("No JWT principal");
+        }
+
+        // ---- Läs roller på ett säkert sätt ----
+        List<String> roles = extractRealmRoles(jwt);
+
+        // ---- Bygg svar ----
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("sub", jwt.getSubject());
+        response.put("email", jwt.getClaimAsString("email"));
+        response.put("preferred_username", jwt.getClaimAsString("preferred_username"));
+        response.put("householdId", jwt.getClaimAsString("household_id"));
+        response.put("roles", roles);
+
+        return response;
+    }
+
+    private static List<String> extractRealmRoles(Jwt jwt) {
+        Object realmAccess = jwt.getClaims().get("realm_access");
+        if (!(realmAccess instanceof Map<?,?> map)) return List.of();
+
+        Object rawRoles = map.get("roles");
+        if (rawRoles instanceof Collection<?> col) {
+            List<String> result = new ArrayList<>();
+            for (Object o : col) result.add(String.valueOf(o));
+            return result;
+        }
+        return List.of();
+    }
+}

src/main/java/se/urmo/hemhub/web/PublicController.java

@@ -9,14 +9,17 @@ import java.util.Map;
 @RestController
 public class PublicController {
 
-    @Value("${app.version:dev}")
-    String version;
+    private final String version;
+
+    public PublicController(@Value("${app.version:dev}") String version) {
+        this.version = version;
+    }
 
     @GetMapping("/public/info")
     public Map<String, Object> info() {
         return Map.of(
                 "name", "HemHub API",
-                "version", version,
+                "version", version != null ? version : "dev",
                 "timestamp", Instant.now().toString()
         );
     }