[api] Add internal aquaviewer serving feature

src/main/java/icu/samnyan/aqua/api/config/WebConfig.java

@@ -0,0 +1,38 @@
+package icu.samnyan.aqua.api.config;
+
+import java.io.IOException;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.Resource;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import org.springframework.web.servlet.resource.PathResourceResolver;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+
+        // Static assets (images), this priority must be higher than routes
+        registry.addResourceHandler("/web/assets/**")
+        .addResourceLocations("file:web/assets/")
+        .setCachePeriod(10)
+        .resourceChain(true)
+        .addResolver(new PathResourceResolver());
+
+        // For angularjs html5 routes
+        registry.addResourceHandler("/web/**", "/web/", "/web")
+                .addResourceLocations("file:web/")
+                .setCachePeriod(10)
+                .resourceChain(true)
+                .addResolver(new PathResourceResolver() {
+                    @Override
+                    protected Resource getResource(String resourcePath, Resource location) throws IOException {
+                        Resource requestedResource = location.createRelative(resourcePath);
+                        return requestedResource.exists() && requestedResource.isReadable() ? requestedResource : new FileSystemResource("web/index.html");
+                    }
+                });
+    }
+}