Front controller fixes

src/main/java/org/tailormap/api/configuration/base/FrontControllerResolver.java

@@ -10,8 +10,14 @@
 import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Locale;
+import java.util.regex.Pattern;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.core.io.Resource;
 import org.springframework.lang.NonNull;
+import org.springframework.stereotype.Component;
 import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;
 import org.springframework.web.servlet.resource.ResourceResolver;
 import org.springframework.web.servlet.resource.ResourceResolverChain;
@@ -26,21 +32,36 @@
  * <br>
  * When the user refreshes the page such routes are requested from the server.
  */
-public class FrontControllerResolver implements ResourceResolver {
-  private final AcceptHeaderLocaleResolver localeResolver;
+@Component
+public class FrontControllerResolver implements ResourceResolver, InitializingBean {
 
   private final ConfigurationRepository configurationRepository;
   private final ApplicationRepository applicationRepository;
-  private final boolean staticOnly;
+
+  @Value("${spring.profiles.active:}")
+  private String activeProfile;
+
+  @Value("#{'${tailormap-api.supported-languages:en}'.split(',')}")
+  private List<String> supportedLanguages;
+
+  private AcceptHeaderLocaleResolver localeResolver;
+
+  private boolean staticOnly;
+
+  private Pattern localeBundlePrefixPattern = Pattern.compile("^[a-z]{2}/.*");
 
   public FrontControllerResolver(
-      ConfigurationRepository configurationRepository,
-      ApplicationRepository applicationRepository,
-      List<String> supportedLanguages,
-      boolean staticOnly) {
+      // Inject these repositories lazily because in the static-only profile these are not needed
+      // but also not configured
+      @Lazy ConfigurationRepository configurationRepository,
+      @Lazy ApplicationRepository applicationRepository) {
     this.configurationRepository = configurationRepository;
     this.applicationRepository = applicationRepository;
-    this.staticOnly = staticOnly;
+  }
+
+  @Override
+  public void afterPropertiesSet() {
+    this.staticOnly = activeProfile.contains("static-only");
 
     this.localeResolver = new AcceptHeaderLocaleResolver();
     localeResolver.setSupportedLocales(supportedLanguages.stream().map(Locale::new).toList());
@@ -64,8 +85,13 @@
     }
 
     // Check if the request path already starts with a locale prefix like en/ or nl/
-    if (requestPath.matches("^[a-z]{2}/.*")) {
-      return chain.resolveResource(request, requestPath.substring(0, 2) + "/index.html", locations);
+    String localePrefix = StringUtils.left(requestPath, 2);
+    if ((localeBundlePrefixPattern.matcher(requestPath).matches()
+            && supportedLanguages.contains(localePrefix))
+        // When the request is just "GET /nl/" or "GET /nl" the requestPath is "nl" without a
+        // trailing slash
+        || supportedLanguages.contains(requestPath)) {
+      return chain.resolveResource(request, localePrefix + "/index.html", locations);
     }
 
     // When the request path denotes an app, return the index.html for the default language

src/main/java/org/tailormap/api/configuration/base/IndexHtmlTransformer.java

@@ -7,16 +7,10 @@
 package org.tailormap.api.configuration.base;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
-import static org.apache.commons.lang3.StringUtils.isNotBlank;
 
 import jakarta.servlet.http.HttpServletRequest;
 import java.io.IOException;
-import java.lang.invoke.MethodHandles;
-import org.apache.commons.io.IOUtils;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.context.EnvironmentAware;
-import org.springframework.core.env.Environment;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.Resource;
 import org.springframework.lang.NonNull;
 import org.springframework.stereotype.Component;
@@ -25,16 +19,9 @@
 import org.springframework.web.servlet.resource.TransformedResource;
 
 @Component
-public class IndexHtmlTransformer implements ResourceTransformer, EnvironmentAware {
-  private static final Logger logger =
-      LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
-
-  private Environment environment;
-
-  @Override
-  public void setEnvironment(@NonNull Environment environment) {
-    this.environment = environment;
-  }
+public class IndexHtmlTransformer implements ResourceTransformer {
+  @Value("${tailormap-api.sentry.dsn}")
+  private String sentryDsn;
 
   @Override
   @NonNull
@@ -43,22 +30,14 @@
       @NonNull Resource resource,
       @NonNull ResourceTransformerChain transformerChain)
       throws IOException {
-    // Note that caching is not required because of cacheResources param to resourceChain() in
-    // WebMvcConfig
-
     resource = transformerChain.transform(request, resource);
 
-    if (!"index.html".equals(resource.getFilename())) {
+    if (sentryDsn == null || !"index.html".equals(resource.getFilename())) {
       return resource;
     }
 
-    String html = IOUtils.toString(resource.getInputStream(), UTF_8);
-    String sentryDsn = environment.getProperty("VIEWER_SENTRY_DSN");
-    if (isNotBlank(sentryDsn)) {
-      logger.info(
-          "Sending Sentry DSN {} for index {}", sentryDsn, resource.getFile().getAbsolutePath());
-      html = html.replace("@SENTRY_DSN@", sentryDsn);
-    }
+    String html = resource.getContentAsString(UTF_8);
+    html = html.replace("@SENTRY_DSN@", sentryDsn);
     return new TransformedResource(resource, html.getBytes(UTF_8));
   }
 }

src/main/java/org/tailormap/api/configuration/base/WebMvcConfig.java

@@ -6,10 +6,9 @@
 
 package org.tailormap.api.configuration.base;
 
-import java.util.List;
+import java.util.concurrent.TimeUnit;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Lazy;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.http.CacheControl;
 import org.springframework.lang.NonNull;
@@ -18,35 +17,20 @@
 import org.springframework.web.servlet.resource.EncodedResourceResolver;
 import org.tailormap.api.configuration.CaseInsensitiveEnumConverter;
 import org.tailormap.api.persistence.json.GeoServiceProtocol;
-import org.tailormap.api.repository.ApplicationRepository;
-import org.tailormap.api.repository.ConfigurationRepository;
 import org.tailormap.api.scheduling.TaskType;
 
 @Configuration
 public class WebMvcConfig implements WebMvcConfigurer {
+  private final FrontControllerResolver frontControllerResolver;
   private final IndexHtmlTransformer indexHtmlTransformer;
 
   @Value("${spring.web.resources.static-locations:file:/home/spring/static/}")
   private String resourceLocations;
 
-  @Value("#{'${tailormap-api.supported-languages:en}'.split(',')}")
-  private List<String> supportedLanguages;
-
-  @Value("${spring.profiles.active:}")
-  private String activeProfile;
-
-  private final ConfigurationRepository configurationRepository;
-  private final ApplicationRepository applicationRepository;
-
   public WebMvcConfig(
-      IndexHtmlTransformer indexHtmlTransformer,
-      // Inject these repositories lazily because in the static-only profile these are not needed
-      // but also not configured
-      @Lazy ConfigurationRepository configurationRepository,
-      @Lazy ApplicationRepository applicationRepository) {
+      FrontControllerResolver frontControllerResolver, IndexHtmlTransformer indexHtmlTransformer) {
+    this.frontControllerResolver = frontControllerResolver;
     this.indexHtmlTransformer = indexHtmlTransformer;
-    this.configurationRepository = configurationRepository;
-    this.applicationRepository = applicationRepository;
   }
 
   @Override
@@ -55,20 +39,23 @@
         .addResourceHandler("/version.json")
         .addResourceLocations(resourceLocations.split(",", -1)[0])
         .setCacheControl(CacheControl.noStore());
+    registry
+        // Add cache headers for frontend bundle resources with hash in filename and fonts/images
+        .addResourceHandler("/*/*.js", "/*/*.css", "/*/*.map", "/*/media/**", "/*/icons/**")
+        .addResourceLocations(resourceLocations.split(",", -1)[0])
+        .setCacheControl(CacheControl.maxAge(7, TimeUnit.DAYS).mustRevalidate())
+        .resourceChain(true)
+        .addResolver(new EncodedResourceResolver());
     registry
         .addResourceHandler("/**")
         .addResourceLocations(resourceLocations.split(",", -1)[0])
         // no-cache means the browser must revalidate index.html with a conditional HTTP request
         // using If-Modified-Since. This is needed to always have the latest frontend loaded in the
         // browser after deployment of a new release.
         .setCacheControl(CacheControl.noCache())
-        .resourceChain(true)
-        .addResolver(
-            new FrontControllerResolver(
-                configurationRepository,
-                applicationRepository,
-                supportedLanguages,
-                activeProfile.contains("static-only")))
+        // Don't cache resources which can vary per user because of the Accept-Language header
+        .resourceChain(false)
+        .addResolver(frontControllerResolver)
         .addResolver(new EncodedResourceResolver())
         .addTransformer(indexHtmlTransformer);
   }

src/main/resources/application.properties

@@ -7,6 +7,8 @@ tailormap-api.admin.base-path=/api/admin
 # The first language is used as the default.
 tailormap-api.supported-languages=en,nl,de
 
+tailormap-api.sentry.dsn=${VIEWER_SENTRY_DSN:#{null}}
+
 tailormap-api.security.admin.create-if-not-exists=true
 tailormap-api.security.admin.username=tm-admin
 # A hashed password can be specified in the ADMIN_HASHED_PASSWORD environment variable. If empty or not specified a