WebConfig.java

package cz.vsb.crm.config;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.lang.NonNull;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.resource.PathResourceResolver;

import java.io.IOException;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(@NonNull CorsRegistry registry) {
        registry.addMapping("/api/**")
                .allowedOrigins("http://localhost:5173")
                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
                .allowedHeaders("*");
        registry.addMapping("/v3/**")
                .allowedOrigins("http://localhost:5173")
                .allowedMethods("GET");
    }

    @Override
    public void addResourceHandlers(@NonNull ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/")
                .resourceChain(true)
                .addResolver(new PathResourceResolver() {
                    @Override
                    protected Resource getResource(@NonNull String resourcePath, @NonNull Resource location)
                            throws IOException {
                        Resource requested = location.createRelative(resourcePath);
                        if (requested.exists() && requested.isReadable()) {
                            return requested;
                        }

                        if (resourcePath.startsWith("api")
                                || resourcePath.startsWith("v3")
                                || resourcePath.startsWith("swagger-ui")
                                || resourcePath.startsWith("h2-console")
                                || resourcePath.startsWith("webjars")
                                || resourcePath.contains(".")) {
                            return null;
                        }

                        Resource index = new ClassPathResource("/static/index.html");
                        return index.exists() ? index : null;
                    }
                });
    }
}