[api] Adapt index to be generated / cleanup static resource handlers

openex-api/src/main/java/io/openex/config/MvcConfig.java

@@ -1,44 +1,20 @@
 package io.openex.config;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
+import org.jetbrains.annotations.NotNull;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.io.ClassPathResource;
-import org.springframework.core.io.Resource;
 import org.springframework.http.converter.ByteArrayHttpMessageConverter;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
-import org.springframework.web.servlet.resource.AbstractResourceResolver;
 import org.springframework.web.servlet.resource.EncodedResourceResolver;
 import org.springframework.web.servlet.resource.PathResourceResolver;
-import org.springframework.web.servlet.resource.ResourceResolverChain;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.validation.constraints.NotNull;
 import java.util.List;
 
-
-class ReactIndexResourceResolver extends AbstractResourceResolver {
-
-  @Override
-  protected Resource resolveResourceInternal(HttpServletRequest request, @NotNull String requestPath,
-      @NotNull List<? extends Resource> locations,
-      @NotNull ResourceResolverChain chain) {
-    return new ClassPathResource("/build/index.html");
-  }
-
-  @Override
-  protected String resolveUrlPathInternal(@NotNull String resourceUrlPath,
-      @NotNull List<? extends Resource> locations,
-      @NotNull ResourceResolverChain chain) {
-    return chain.resolveUrlPath(resourceUrlPath, locations);
-  }
-}
-
 @Configuration
 @EnableWebMvc
 public class MvcConfig implements WebMvcConfigurer {
@@ -59,7 +35,6 @@ public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter()
   public void configureMessageConverters(List<HttpMessageConverter<?>> messageConverters) {
     //https://springdoc.org/#why-am-i-getting-an-error-swagger-ui-unable-to-render-definition-when-overriding-the-default-spring-registered-httpmessageconverter
     messageConverters.add(new ByteArrayHttpMessageConverter());
-
     messageConverters.add(new StringHttpMessageConverter());
     messageConverters.add(customJackson2HttpMessageConverter());
   }
@@ -69,20 +44,13 @@ private void addPathStaticResolver(ResourceHandlerRegistry registry, String patt
         .addResourceHandler(pattern)
         .addResourceLocations(location)
         .setCachePeriod(CACHE_PERIOD)
-        .resourceChain(true)
+        .resourceChain(false)
         .addResolver(new EncodedResourceResolver())
         .addResolver(new PathResourceResolver());
   }
 
   @Override
-  public void addResourceHandlers(ResourceHandlerRegistry registry) {
-    // Specific case of react index
-    registry.addResourceHandler("*")
-        .addResourceLocations("classpath:/build/")
-        .setCachePeriod(CACHE_PERIOD)
-        .resourceChain(true)
-        .addResolver(new EncodedResourceResolver())
-        .addResolver(new ReactIndexResourceResolver());
+  public void addResourceHandlers(@NotNull ResourceHandlerRegistry registry) {
     // React statics
     addPathStaticResolver(registry, "/static/**", "classpath:/build/static/");
     // Specific application images

openex-api/src/main/java/io/openex/rest/HomeApi.java

@@ -0,0 +1,45 @@
+package io.openex.rest;
+
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.util.FileCopyUtils;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.UncheckedIOException;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+@RestController
+public class HomeApi {
+
+    private static String readResourceAsString(Resource resource) {
+        try (Reader reader = new InputStreamReader(resource.getInputStream(), UTF_8)) {
+            return FileCopyUtils.copyToString(reader);
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
+    @GetMapping(path = "/**", produces = MediaType.TEXT_HTML_VALUE)
+    public ResponseEntity<String> home() {
+        ClassPathResource classPathResource = new ClassPathResource("/build/index.html");
+        String index = readResourceAsString(classPathResource);
+        String basePath = ""; // TODO Add this in configuration
+        String newIndex = index.
+                replaceAll("%APP_TITLE%", "OpenEx - Crisis Exercises and Adversary Simulation Platform").
+                replaceAll("%APP_DESCRIPTION%", "OpenEx is an open source platform allowing organizations to plan, schedule and conduct crisis exercises as well as adversary simulation campaign.").
+                replaceAll("%APP_FAVICON%", basePath + "/static/ext/favicon.png").
+                replaceAll("%APP_MANIFEST%", basePath + "/static/ext/manifest.json").
+                replaceAll("%BASE_PATH%", basePath);
+        return ResponseEntity.ok()
+                .header(HttpHeaders.CACHE_CONTROL, "no-cache")
+                .body(newIndex);
+    }
+}