cloud drive: add support for Wasabi

* disable md5, sha256 checking to avoid reading one chunk twice
* single threaded upload to avoid chunk swapping (to be enhanced later)

weed/remote_storage/s3/wasabi.go

@@ -0,0 +1,57 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["wasabi"] = new(WasabiRemoteStorageMaker)
+}
+
+type WasabiRemoteStorageMaker struct{}
+
+func (s WasabiRemoteStorageMaker) Make(conf *filer_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.WasabiAccessKey)
+	secretKey := util.Nvl(conf.WasabiSecretKey)
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.WasabiEndpoint),
+		Region:                        aws.String(conf.WasabiRegion),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create wasabi session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
+
+var skipSha256PayloadSigning = func(r *request.Request) {
+	// see https://github.com/ceph/ceph/pull/15965/files
+	if r.ClientInfo.ServiceID != "S3" {
+		return
+	}
+	if r.Operation.Name == "PutObject" || r.Operation.Name == "UploadPart" {
+		if len(r.HTTPRequest.Header.Get("X-Amz-Content-Sha256")) == 0 {
+			r.HTTPRequest.Header.Set("X-Amz-Content-Sha256", "UNSIGNED-PAYLOAD")
+		}
+	}
+}