Add support for sec:authorize attribute of Thymeleaf (#7322)

#### What type of PR is this?

/kind improvement
/area core
/area theme
/milestone 2.20.x

#### What this PR does / why we need it:

This PR adds support for sec:authorize attribute of Thymeleaf which is not supported yet. See https://github.com/halo-dev/halo/issues/7316 for more.

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/7316

#### Does this PR introduce a user-facing change?

```release-note
完善主题模板判断用户角色等功能
```

application/src/main/java/run/halo/app/infra/config/WebServerSecurityConfig.java

@@ -10,6 +10,7 @@ import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
+import org.springframework.security.config.annotation.method.configuration.EnableReactiveMethodSecurity;
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
 import org.springframework.security.config.web.server.ServerHttpSecurity;
 import org.springframework.security.crypto.factory.PasswordEncoderFactories;
@@ -44,6 +45,7 @@ import run.halo.app.security.session.ReactiveIndexedSessionRepository;
 @Configuration
 @EnableSpringWebSession
 @EnableWebFluxSecurity
+@EnableReactiveMethodSecurity
 @RequiredArgsConstructor
 public class WebServerSecurityConfig {
 

application/src/main/java/run/halo/app/theme/config/ThemeConfiguration.java

@@ -5,6 +5,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.info.BuildProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.security.access.expression.method.MethodSecurityExpressionHandler;
 import org.springframework.security.web.server.context.ServerSecurityContextRepository;
 import org.thymeleaf.extras.springsecurity6.dialect.SpringSecurityDialect;
 import run.halo.app.theme.dialect.GeneratorMetaProcessor;
@@ -26,8 +27,9 @@ public class ThemeConfiguration {
 
     @Bean
     SpringSecurityDialect springSecurityDialect(
-        ServerSecurityContextRepository securityContextRepository) {
+        ServerSecurityContextRepository securityContextRepository,
-        return new HaloSpringSecurityDialect(securityContextRepository);
+        ObjectProvider<MethodSecurityExpressionHandler> expressionHandler) {
+        return new HaloSpringSecurityDialect(securityContextRepository, expressionHandler);
     }
 
     @Bean

application/src/main/java/run/halo/app/theme/dialect/HaloSpringSecurityDialect.java

@@ -1,18 +1,36 @@
 package run.halo.app.theme.dialect;
 
 import static org.springframework.security.core.authority.AuthorityUtils.createAuthorityList;
+import static org.thymeleaf.extras.springsecurity6.dialect.processor.AuthorizeAttrProcessor.ATTR_NAME;
+import static org.thymeleaf.extras.springsecurity6.dialect.processor.AuthorizeAttrProcessor.ATTR_PRECEDENCE;
 import static run.halo.app.infra.AnonymousUserConst.PRINCIPAL;
 import static run.halo.app.infra.AnonymousUserConst.Role;
 
+import java.util.LinkedHashSet;
+import java.util.Optional;
+import java.util.Set;
 import java.util.function.Function;
 import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.security.access.expression.ExpressionUtils;
+import org.springframework.security.access.expression.method.MethodSecurityExpressionHandler;
 import org.springframework.security.authentication.AnonymousAuthenticationToken;
+import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextImpl;
+import org.springframework.security.util.MethodInvocationUtils;
 import org.springframework.security.web.server.context.ServerSecurityContextRepository;
 import org.springframework.web.server.ServerWebExchange;
+import org.thymeleaf.context.ITemplateContext;
+import org.thymeleaf.engine.AttributeName;
+import org.thymeleaf.extras.springsecurity6.auth.AuthUtils;
 import org.thymeleaf.extras.springsecurity6.dialect.SpringSecurityDialect;
 import org.thymeleaf.extras.springsecurity6.util.SpringSecurityContextUtils;
+import org.thymeleaf.extras.springsecurity6.util.SpringVersionSpecificUtils;
 import org.thymeleaf.extras.springsecurity6.util.SpringVersionUtils;
+import org.thymeleaf.model.IProcessableElementTag;
+import org.thymeleaf.processor.IProcessor;
+import org.thymeleaf.standard.processor.AbstractStandardConditionalVisibilityTagProcessor;
+import org.thymeleaf.templatemode.TemplateMode;
 import run.halo.app.security.authorization.AuthorityUtils;
 
 /**
@@ -28,8 +46,12 @@ public class HaloSpringSecurityDialect extends SpringSecurityDialect implements
 
     private final ServerSecurityContextRepository securityContextRepository;
 
-    public HaloSpringSecurityDialect(ServerSecurityContextRepository securityContextRepository) {
+    private final ObjectProvider<MethodSecurityExpressionHandler> expressionHandler;
+
+    public HaloSpringSecurityDialect(ServerSecurityContextRepository securityContextRepository,
+        ObjectProvider<MethodSecurityExpressionHandler> expressionHandler) {
         this.securityContextRepository = securityContextRepository;
+        this.expressionHandler = expressionHandler;
     }
 
     @Override
@@ -53,4 +75,81 @@ public class HaloSpringSecurityDialect extends SpringSecurityDialect implements
         // Just overwrite the value of the attribute
         getExecutionAttributes().put(SECURITY_CONTEXT_EXECUTION_ATTRIBUTE_NAME, secCtxInitializer);
     }
+
+    @Override
+    public Set<IProcessor> getProcessors(String dialectPrefix) {
+        LinkedHashSet<IProcessor> processors = new LinkedHashSet<>();
+        processors.add(
+            new HaloAuthorizeAttrProcessor(TemplateMode.HTML, dialectPrefix, ATTR_NAME)
+        );
+        processors.addAll(super.getProcessors(dialectPrefix));
+        return processors;
+    }
+
+    public class HaloAuthorizeAttrProcessor
+        extends AbstractStandardConditionalVisibilityTagProcessor {
+
+        protected HaloAuthorizeAttrProcessor(TemplateMode templateMode, String dialectPrefix,
+            String attrName) {
+            super(templateMode, dialectPrefix, attrName, ATTR_PRECEDENCE - 10);
+        }
+
+        @Override
+        protected boolean isVisible(ITemplateContext context, IProcessableElementTag tag,
+            AttributeName attributeName, String attributeValue) {
+
+            final String attrValue = (attributeValue == null ? null : attributeValue.trim());
+
+            if (attrValue == null || attrValue.isEmpty()) {
+                return false;
+            }
+
+            final Authentication authentication = AuthUtils.getAuthenticationObject(context);
+
+            if (authentication == null) {
+                return false;
+            }
+
+            // resolve expr
+            var expr = Optional.of(attributeValue)
+                .filter(v -> v.startsWith("${") && v.endsWith("}"))
+                .map(v -> v.substring(2, v.length() - 1))
+                .orElse(attributeValue);
+
+            var expressionHandler = HaloSpringSecurityDialect.this.expressionHandler.getIfUnique();
+            if (expressionHandler == null) {
+                // no expression handler found
+                return false;
+            }
+
+            var expression = expressionHandler.getExpressionParser().parseExpression(expr);
+
+            var methodInvocation = MethodInvocationUtils.createFromClass(this,
+                HaloAuthorizeAttrProcessor.class,
+                "dummyAuthorize",
+                new Class[] {Authentication.class},
+                new Object[] {authentication}
+            );
+            var evaluationContext =
+                expressionHandler.createEvaluationContext(authentication, methodInvocation);
+
+            var expressionObjects = context.getExpressionObjects();
+            var wrappedEvolutionContext = SpringVersionSpecificUtils.wrapEvaluationContext(
+                evaluationContext, expressionObjects
+            );
+
+            return ExpressionUtils.evaluateAsBoolean(expression, wrappedEvolutionContext);
+        }
+
+        /**
+         * This method is only used to create a method invocation for the expression parser.
+         *
+         * @param authentication authentication object
+         * @return result of authorization expression evaluation
+         */
+        public Boolean dummyAuthorize(Authentication authentication) {
+            throw new UnsupportedOperationException("Should not be called");
+        }
+
+    }
 }

application/src/test/java/run/halo/app/theme/dialect/HaloSpringSecurityDialectTest.java

@@ -0,0 +1,92 @@
+package run.halo.app.theme.dialect;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.params.provider.Arguments.arguments;
+import static org.springframework.http.MediaType.TEXT_HTML;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
+import org.springframework.mock.web.server.MockServerWebExchange;
+import org.springframework.security.access.expression.method.MethodSecurityExpressionHandler;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.core.context.SecurityContextImpl;
+import org.springframework.security.web.server.context.ServerSecurityContextRepository;
+import org.thymeleaf.TemplateEngine;
+import org.thymeleaf.context.WebContext;
+import org.thymeleaf.extras.springsecurity6.util.SpringSecurityContextUtils;
+import org.thymeleaf.spring6.SpringWebFluxTemplateEngine;
+import org.thymeleaf.spring6.web.webflux.SpringWebFluxWebApplication;
+import org.thymeleaf.templateresolver.StringTemplateResolver;
+
+// @ExtendWith(MockitoExtension.class)
+@SpringBootTest
+class HaloSpringSecurityDialectTest {
+
+    TemplateEngine templateEngine;
+
+    @Autowired
+    ServerSecurityContextRepository securityContextRepository;
+
+    @Autowired
+    ObjectProvider<MethodSecurityExpressionHandler> expressionHandler;
+
+
+    @BeforeEach
+    void setUp() {
+        var haloSpringSecurityDialect =
+            new HaloSpringSecurityDialect(securityContextRepository, expressionHandler);
+        templateEngine = new SpringWebFluxTemplateEngine();
+        templateEngine.addTemplateResolver(new StringTemplateResolver());
+        templateEngine.addDialect(haloSpringSecurityDialect);
+    }
+
+    static Stream<Arguments> shouldEvaluateSecAuthorizeAttr() {
+        return Stream.of(
+            arguments(
+                "Evaluate sec:authorize to true when role match",
+                List.of("ROLE_ADMIN"),
+                """
+                    <p sec:authorize="hasRole('ROLE_ADMIN')">Admin</p>\
+                    """,
+                """
+                    <p>Admin</p>\
+                    """),
+            arguments(
+                "Evaluate sec:authorize to false when role not match",
+                List.of("ROLE_USER"),
+                """
+                    <p sec:authorize="hasRole('ROLE_ADMIN')"></p>\
+                    """,
+                "")
+        );
+    }
+
+    @ParameterizedTest(name = "{0}")
+    @MethodSource
+    void shouldEvaluateSecAuthorizeAttr(String name, List<String> authorities, String template,
+        String expected) {
+        var request = MockServerHttpRequest.get("/halo-sec-authorize").build();
+        var exchange = new MockServerWebExchange.Builder(request).build();
+        var webExchange = SpringWebFluxWebApplication.buildApplication(null)
+            .buildExchange(exchange, Locale.getDefault(), TEXT_HTML, UTF_8);
+        var context = new WebContext(webExchange);
+        var authentication = new UsernamePasswordAuthenticationToken("fake-user", "fake-credential",
+            AuthorityUtils.createAuthorityList(authorities));
+        var securityContext = new SecurityContextImpl(authentication);
+        context.setVariable(SpringSecurityContextUtils.SECURITY_CONTEXT_MODEL_ATTRIBUTE_NAME,
+            securityContext);
+        var result = templateEngine.process(template, context);
+        assertEquals(expected, result);
+    }
+}