"For an upload InputStream with no MD5 digest metadata, the markSupported() method must evaluate to true." 在 Spring 集成 AWS

Question

更新：spring-integration-aws-2.3.4

中存在错误

我将 SFTP (SftpStreamingMessageSource) 作为源与 S3 作为目标集成。我有类似的 Spring 集成配置：

    @Bean
    public S3MessageHandler.UploadMetadataProvider uploadMetadataProvider() {
        return (metadata, message) -> {
            if ( message.getPayload() instanceof DigestInputStream) {
                metadata.setContentType( MediaType.APPLICATION_JSON_VALUE );
                // can not read stream to manually compute MD5
                // metadata.setContentMD5("BLABLA==");
                // this is wrong approach:  metadata.setContentMD5(BinaryUtils.toBase64((((DigestInputStream) message.getPayload()).getMessageDigest().digest()));
            }
        };
    }
    @Bean
    @InboundChannelAdapter(channel = "ftpStream")
    public MessageSource<InputStream> ftpSource(SftpRemoteFileTemplate template) {
        SftpStreamingMessageSource messageSource = new SftpStreamingMessageSource(template);
        messageSource.setRemoteDirectory("foo");
        messageSource.setFilter(new AcceptAllFileListFilter<>());
        messageSource.setMaxFetchSize(1);
        messageSource.setLoggingEnabled(true);
        messageSource.setCountsEnabled(true);
        return messageSource;
    }
...
    @Bean
    @ServiceActivator(inputChannel = "ftpStream")
    public MessageHandler s3MessageHandler(AmazonS3 amazonS3, S3MessageHandler.UploadMetadataProvider uploadMetadataProvider) {
        S3MessageHandler messageHandler = new S3MessageHandler(amazonS3, "bucketName");
        messageHandler.setLoggingEnabled(true);
        messageHandler.setCountsEnabled(true);
        messageHandler.setCommand(S3MessageHandler.Command.UPLOAD);
        messageHandler.setUploadMetadataProvider(uploadMetadataProvider);
        messageHandler.setKeyExpression(new ValueExpression<>("key"));
        return messageHandler;
    }

启动后出现以下错误 "For an upload InputStream with no MD5 digest metadata, the markSupported() method must evaluate to true."

这是因为 ftpSource 在没有 mark/reset 支持的情况下生成 InputStream 有效载荷。我什至尝试使用 @Transformer 将 InputStream 转换为 BufferedInputStream，例如正在关注

return new BufferedInputStream((InputStream) message.getPayload());

没有成功，因为那时我收到消息“java.io.IOException：流已关闭”，因为 S3MessageHandler:338 正在调用 Md5Utils.md5AsBase64(inputStream) 过早关闭流.

如何在 Spring Integration AWS 中轻松为所有消息生成 MD5？

我正在使用 spring-integration-aws-2.3.4.RELEASE

Answer 1

S3MessageHandler 这样做：

if (payload instanceof InputStream) {
                InputStream inputStream = (InputStream) payload;
                if (metadata.getContentMD5() == null) {
                    Assert.state(inputStream.markSupported(),
                            "For an upload InputStream with no MD5 digest metadata, "
                                    + "the markSupported() method must evaluate to true.");
                    String contentMd5 = Md5Utils.md5AsBase64(inputStream);
                    metadata.setContentMD5(contentMd5);
                    inputStream.reset();
                }
                putObjectRequest = new PutObjectRequest(bucketName, key, inputStream, metadata);
            }

Md5Utils.md5AsBase64() 最终关闭了一个 InputStream - 对我们不利。

这是我们这边的疏忽。请提出 GH 问题，我们会尽快解决。或者随时提供贡献。

作为解决方法，我建议在此 S3MessageHandler 之前使用一个转换器，代码如下：

return org.springframework.util.StreamUtils.copyToByteArray(inputStream);

这样你就已经有了一个 byte[] 作为 S3MessageHandler 的有效负载，它将使用不同的分支进行处理：

 else if (payload instanceof byte[]) {
                byte[] payloadBytes = (byte[]) payload;
                InputStream inputStream = new ByteArrayInputStream(payloadBytes);
                if (metadata.getContentMD5() == null) {
                    String contentMd5 = Md5Utils.md5AsBase64(inputStream);
                    metadata.setContentMD5(contentMd5);
                    inputStream.reset();
                }
                if (metadata.getContentLength() == 0) {
                    metadata.setContentLength(payloadBytes.length);
                }
                putObjectRequest = new PutObjectRequest(bucketName, key, inputStream, metadata);
            }

"For an upload InputStream with no MD5 digest metadata, the markSupported() method must evaluate to true." 在 Spring 集成 AWS

"For an upload InputStream with no MD5 digest metadata, the markSupported() method must evaluate to true." in Spring Integration AWS

spring

amazon-s3

spring-integration

spring-integration-aws