how to set object Content-Type in composeObject

[realAndDream]

Hello everyone.
I want to upload an mp4 file to minio. I first uploaded the file's fragmented data, and then used composeObject to merge these fragmented files. The objects can be merged into a new object, but its Content-Type is binary/octet-stream. I can't modify the ContentType using UserMetadata. How do I specify this Content-Type? Thanks, the code is following:

async composeFileParts(dto: ComposeFilePartsDto) {
    const stream = this.minioClient.listObjects(dto.bucket, `${dto.md5}_`)
    const data = (await getReadObjectsNamesStreamData(stream)) as [
        {
            name: string
        },
    ]

    const allIndex: number[] = data.map((value) => {
        return parseInt(value.name.substring(value.name.lastIndexOf("_") + 1))
    })
    allIndex.sort((a, b) => (a < b ? -1 : 1))

    const sourceList: minio.CopySourceOptions[] = []
    allIndex.forEach((value) => {
        const source = new minio.CopySourceOptions({
            Bucket: dto.bucket,
            Object: `${dto.md5}_${value}`,
        })
        sourceList.push(source)
    })

    const destOption = new minio.CopyDestinationOptions({
        Bucket: dto.bucket,
        Object: `${dto.md5}.${dto.suffix}`,
        UserMetadata: {
            "Content-Type": "video/mp4",
            test: "test",
        },
        MetadataDirective: "REPLACE",
    })
    await this.minioClient.composeObject(destOption, sourceList)
}

[MamyAKKK]

I also encountered the same problem. (^_^)/

[fengjinlovewei]

Have the same problem and no developer to help?

[fengjinlovewei]

By the way, even if I set the "content-type" to "video/mp4" when I use fetch to upload the shard, the problem still exists

[fengjinlovewei]

I found a solution

import * as Minio from 'minio';
import mime from 'mime';

class MyCopyDestinationOptions extends Minio.CopyDestinationOptions {
  headers: Record<string, string> = {};
  constructor(
    option: Minio.ICopyDestinationOptions,
    headers: Record<string, string> = {},
  ) {
    super(option); // 调用父类的constructor()
    this.headers = headers;
  }
  getHeaders() {
    const headerOptions = super.getHeaders();

    for (const [key, value] of Object.entries(this.headers)) {
      headerOptions[key] = value;
    }

    return headerOptions;
  }
}

...
const destOption = new MyCopyDestinationOptions(
    {
      Bucket: bucketName,
      Object: fileName,
      UserMetadata: {
        'Content-Type': mime.getType(fileName)!,
      },
    },
    { 'Content-Type': mime.getType(fileName)! },
  );

const res = await minioClient.composeObject(destOption, sourceList);

If it doesn't work out, you can contact me

[MamyAKKK]

Change set metadata from userMetadata attr to header attr, it's ok now~

ComposeObjectArgs.Builder builder = ComposeObjectArgs.builder();
builder.bucket(bucket);
builder.object(targetPath);
builder.sources(sourceList);

// Metadata setting
Map<String, String> metadata = Maps.newHashMap();
metadata.put("Content-Type", this.getContentType(targetPath));
builder.headers(metadata);// Right
// builder.userMetadata(metadata);// Wrong

this.client.composeObject(builder.build());// Compose Operation