WebConfiguration.java

package com.acme.tree.config;

import java.util.Arrays;
import java.util.Collections;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import com.amce.tree.rest.ApiErrorAttributes;

/**
 * Configuration for CORS handling and injecting our custom error attributes.
 */
@Configuration
public class WebConfiguration {

    @Autowired
    private AcmeConfiguration acmeConfiguration;

    @Bean
    public ErrorAttributes errorAttributes() {
        return new ApiErrorAttributes(acmeConfiguration.getApiVersion());
    }

    @Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.setAllowedOrigins(Collections.singletonList("*"));
        config.setAllowedHeaders(Arrays.asList("Authorization", "Cache-Control", "Origin", "Content-Type", "Accept"));
        config.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }

}