Spring Cloud Gateway路由到Amazon S3签名失败处理

@Component
public class S3SignedUrlFilterFactory extends AbstractGatewayFilterFactory<S3SignedUrlFilterFactory.Config> {
 
    private final AmazonS3 amazonS3;
 
    public S3SignedUrlFilterFactory(AmazonS3 amazonS3) {
        super(Config.class);
        this.amazonS3 = amazonS3;
    }
 
    @Override
    public GatewayFilter apply(Config config) {
        return (exchange, chain) -> {
            URI uri = exchange.getRequest().getURI();
            String bucket = config.getBucket();
            String region = config.getRegion();
 
            try {
                URL url = new URL(uri.toString());
                String key = url.getPath().substring(1); // Remove leading slash
                Date expiration = new Date(System.currentTimeMillis() + config.getExpirationDuration().toMillis());
                GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucket, key)
                        .withMethod(HttpMethod.GET)
                        .withExpiration(expiration);
                URL presignedUrl = amazonS3.generatePresignedUrl(generatePresignedUrlRequest);
 
                // Modify the original request to use the S3 presigned URL
                HttpHeaders headers = new HttpHeaders();
                headers.setLocation(URI.create(presignedUrl.toString()));
                return chain.filter(exchange.mutate().request(new ServerHttpRequestDecorator(
                        exchange.getRequest(), headers, exchange.getRequest().getBody())).build());
            } catch (Exception e) {
                // Log the error and continue filtering with an unmodified request
                log.error("Failed to generate presigned URL for S3 object: {}", e.getMessage());
                return chain.filter(exchange);
            }
        };
    }
 
    public static class Config {
        // Configuration properties
    }
}

这个代码示例展示了如何在Spring Cloud Gateway中创建一个过滤器工厂来生成指向Amazon S3对象的签名URL。它使用AmazonS3客户端库来生成URL，并在过滤器链中使用它替换原始请求的URL。如果生成签名URL时发生错误，它会记录错误并继续过滤流程，不影响其他请求的处理。