support putifabsent

esti/multipart_test.go

@@ -52,7 +52,7 @@ func TestMultipartUpload(t *testing.T) {
 		partsConcat = append(partsConcat, parts[i]...)
 	}
 
-	completedParts := uploadMultipartParts(t, ctx, logger, resp, parts, 0)
+	completedParts := uploadMultipartParts(t, ctx, svc, logger, resp, parts, 0)
 
 	if isBlockstoreType(block.BlockstoreTypeS3) == nil {
 		// Object should have Last-Modified time at around time of MPU creation.  Ensure
@@ -166,7 +166,7 @@ func reverse(s string) string {
 	return string(runes)
 }
 
-func uploadMultipartParts(t *testing.T, ctx context.Context, logger logging.Logger, resp *s3.CreateMultipartUploadOutput, parts [][]byte, firstIndex int) []types.CompletedPart {
+func uploadMultipartParts(t *testing.T, ctx context.Context, client *s3.Client, logger logging.Logger, resp *s3.CreateMultipartUploadOutput, parts [][]byte, firstIndex int) []types.CompletedPart {
 	count := len(parts)
 	completedParts := make([]types.CompletedPart, count)
 	errs := make([]error, count)
@@ -176,7 +176,7 @@ func uploadMultipartParts(t *testing.T, ctx context.Context, logger logging.Logg
 		go func(i int) {
 			defer wg.Done()
 			partNumber := firstIndex + i + 1
-			completedParts[i], errs[i] = uploadMultipartPart(ctx, logger, svc, resp, parts[i], partNumber)
+			completedParts[i], errs[i] = uploadMultipartPart(ctx, logger, client, resp, parts[i], partNumber)
 		}(i)
 	}
 	wg.Wait()

esti/s3_gateway_test.go

@@ -4,9 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"github.com/aws/aws-sdk-go-v2/aws"
-	"github.com/aws/aws-sdk-go-v2/service/s3"
-	"github.com/go-openapi/swag"
 	"io"
 	"math/rand"
 	"net/http"
@@ -16,6 +13,14 @@ import (
 	"testing"
 	"time"
 
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+	"github.com/aws/smithy-go/middleware"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+	"github.com/go-openapi/swag"
+	"github.com/thanhpk/randstr"
+
 	"github.com/minio/minio-go/v7"
 	"github.com/minio/minio-go/v7/pkg/credentials"
 	"github.com/minio/minio-go/v7/pkg/tags"
@@ -31,10 +36,12 @@ import (
 type GetCredentials = func(id, secret, token string) *credentials.Credentials
 
 const (
-	numUploads           = 100
-	randomDataPathLength = 1020
-	branch               = "main"
-	gatewayTestPrefix    = branch + "/data/"
+	numUploads              = 100
+	randomDataPathLength    = 1020
+	branch                  = "main"
+	gatewayTestPrefix       = branch + "/data/"
+	errorPreconditionFailed = "At least one of the pre-conditions you specified did not hold"
+	errorNotImplemented     = "A header you provided implies functionality that is not implemented"
 )
 
 func newMinioClient(t *testing.T, getCredentials GetCredentials) *minio.Client {
@@ -181,6 +188,106 @@ func TestS3UploadAndDownload(t *testing.T) {
 		})
 	}
 }
+func TestMultipartUploadIfNoneMatch(t *testing.T) {
+	ctx, logger, repo := setupTest(t)
+	defer tearDownTest(repo)
+	s3Endpoint := viper.GetString("s3_endpoint")
+	s3Client := createS3Client(s3Endpoint, t)
+	multipartNumberOfParts := 7
+	multipartPartSize := 5 * 1024 * 1024
+	type TestCase struct {
+		Path          string
+		IfNoneMatch   string
+		ExpectedError string
+	}
+
+	testCases := []TestCase{
+		{Path: "main/object1"},
+		{Path: "main/object1", IfNoneMatch: "*", ExpectedError: errorPreconditionFailed},
+		{Path: "main/object2", IfNoneMatch: "*"},
+	}
+	for _, tc := range testCases {
+		input := &s3.CreateMultipartUploadInput{
+			Bucket: aws.String(repo),
+			Key:    aws.String(tc.Path),
+		}
+
+		resp, err := s3Client.CreateMultipartUpload(ctx, input)
+		require.NoError(t, err, "failed to create multipart upload")
+
+		parts := make([][]byte, multipartNumberOfParts)
+		for i := 0; i < multipartNumberOfParts; i++ {
+			parts[i] = randstr.Bytes(multipartPartSize + i)
+		}
+
+		completedParts := uploadMultipartParts(t, ctx, s3Client, logger, resp, parts, 0)
+
+		completeInput := &s3.CompleteMultipartUploadInput{
+			Bucket:   resp.Bucket,
+			Key:      resp.Key,
+			UploadId: resp.UploadId,
+			MultipartUpload: &types.CompletedMultipartUpload{
+				Parts: completedParts,
+			},
+		}
+		_, err = s3Client.CompleteMultipartUpload(ctx, completeInput, s3.WithAPIOptions(setHTTPHeaders(tc.IfNoneMatch)))
+		if tc.ExpectedError != "" {
+			require.ErrorContains(t, err, tc.ExpectedError)
+		} else {
+			require.NoError(t, err, "expected no error but got %w")
+		}
+	}
+}
+
+func setHTTPHeaders(ifNoneMatch string) func(*middleware.Stack) error {
+	return func(stack *middleware.Stack) error {
+		return stack.Build.Add(middleware.BuildMiddlewareFunc("AddIfNoneMatchHeader", func(
+			ctx context.Context, in middleware.BuildInput, next middleware.BuildHandler,
+		) (
+			middleware.BuildOutput, middleware.Metadata, error,
+		) {
+			if req, ok := in.Request.(*smithyhttp.Request); ok {
+				// Add the If-None-Match header
+				req.Header.Set("If-None-Match", ifNoneMatch)
+			}
+			return next.HandleBuild(ctx, in)
+		}), middleware.Before)
+	}
+}
+func TestS3IfNoneMatch(t *testing.T) {
+
+	ctx, _, repo := setupTest(t)
+	defer tearDownTest(repo)
+
+	s3Endpoint := viper.GetString("s3_endpoint")
+	s3Client := createS3Client(s3Endpoint, t)
+
+	type TestCase struct {
+		Path          string
+		IfNoneMatch   string
+		ExpectedError string
+	}
+
+	testCases := []TestCase{
+		{Path: "main/object1"},
+		{Path: "main/object1", IfNoneMatch: "*", ExpectedError: errorPreconditionFailed},
+		{Path: "main/object2", IfNoneMatch: "*"},
+		{Path: "main/object2"},
+		{Path: "main/object3", IfNoneMatch: "unsupported string", ExpectedError: errorNotImplemented},
+	}
+	for _, tc := range testCases {
+		input := &s3.PutObjectInput{
+			Bucket: aws.String(repo),
+			Key:    aws.String(tc.Path),
+		}
+		_, err := s3Client.PutObject(ctx, input, s3.WithAPIOptions(setHTTPHeaders(tc.IfNoneMatch)))
+		if tc.ExpectedError != "" {
+			require.ErrorContains(t, err, tc.ExpectedError)
+		} else {
+			require.NoError(t, err, "expected no error but got %w")
+		}
+	}
+}
 
 func verifyObjectInfo(t *testing.T, got minio.ObjectInfo, expectedSize int) {
 	if got.Err != nil {

pkg/gateway/operations/operation_utils.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/treeverse/lakefs/pkg/catalog"
+	"github.com/treeverse/lakefs/pkg/graveler"
 	"github.com/treeverse/lakefs/pkg/logging"
 )
 
@@ -40,7 +41,7 @@ func shouldReplaceMetadata(req *http.Request) bool {
 	return req.Header.Get(amzMetadataDirectiveHeaderPrefix) == "REPLACE"
 }
 
-func (o *PathOperation) finishUpload(req *http.Request, mTime *time.Time, checksum, physicalAddress string, size int64, relative bool, metadata map[string]string, contentType string) error {
+func (o *PathOperation) finishUpload(req *http.Request, mTime *time.Time, checksum, physicalAddress string, size int64, relative bool, metadata map[string]string, contentType string, allowOverwrite bool) error {
 	var writeTime time.Time
 	if mTime == nil {
 		writeTime = time.Now()
@@ -59,7 +60,7 @@ func (o *PathOperation) finishUpload(req *http.Request, mTime *time.Time, checks
 		ContentType(contentType).
 		Build()
 
-	err := o.Catalog.CreateEntry(req.Context(), o.Repository.Name, o.Reference, entry)
+	err := o.Catalog.CreateEntry(req.Context(), o.Repository.Name, o.Reference, entry, graveler.WithIfAbsent(!allowOverwrite))
 	if err != nil {
 		o.Log(req).WithError(err).Error("could not update metadata")
 		return err

pkg/gateway/operations/postobject.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/treeverse/lakefs/pkg/block"
+	"github.com/treeverse/lakefs/pkg/catalog"
 	gatewayErrors "github.com/treeverse/lakefs/pkg/gateway/errors"
 	"github.com/treeverse/lakefs/pkg/gateway/multipart"
 	"github.com/treeverse/lakefs/pkg/gateway/path"
@@ -94,6 +95,23 @@ func (controller *PostObject) HandleCompleteMultipartUpload(w http.ResponseWrite
 		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrInternalError))
 		return
 	}
+	// check and validate whether if-none-match header provided
+	allowOverwrite, err := o.checkIfAbsent(req)
+	if err != nil {
+		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrNotImplemented))
+		return
+	}
+	// before writing body, ensure preconditions - this means we essentially check for object existence twice:
+	// once here, before uploading the body to save resources and time,
+	// and then graveler will check again when passed a SetOptions.
+	if !allowOverwrite {
+		_, err := o.Catalog.GetEntry(req.Context(), o.Repository.Name, o.Reference, o.Path, catalog.GetEntryParams{})
+		if err == nil {
+			// In case object exists in catalog, no error returns
+			_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrPreconditionFailed))
+			return
+		}
+	}
 	objName := multiPart.PhysicalAddress
 	req = req.WithContext(logging.AddFields(req.Context(), logging.Fields{logging.PhysicalAddressFieldKey: objName}))
 	xmlMultipartComplete, err := io.ReadAll(req.Body)
@@ -124,7 +142,11 @@ func (controller *PostObject) HandleCompleteMultipartUpload(w http.ResponseWrite
 		return
 	}
 	checksum := strings.Split(resp.ETag, "-")[0]
-	err = o.finishUpload(req, resp.MTime, checksum, objName, resp.ContentLength, true, multiPart.Metadata, multiPart.ContentType)
+	err = o.finishUpload(req, resp.MTime, checksum, objName, resp.ContentLength, true, multiPart.Metadata, multiPart.ContentType, allowOverwrite)
+	if errors.Is(err, graveler.ErrPreconditionFailed) {
+		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrPreconditionFailed))
+		return
+	}
 	if errors.Is(err, graveler.ErrWriteToProtectedBranch) {
 		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrWriteToProtectedBranch))
 		return

pkg/gateway/operations/putobject.go

@@ -20,6 +20,7 @@ import (
 )
 
 const (
+	IfNoneMatchHeader     = "If-None-Match"
 	CopySourceHeader      = "x-amz-copy-source"
 	CopySourceRangeHeader = "x-amz-copy-source-range"
 	QueryParamUploadID    = "uploadId"
@@ -30,7 +31,6 @@ type PutObject struct{}
 
 func (controller *PutObject) RequiredPermissions(req *http.Request, repoID, _, destPath string) (permissions.Node, error) {
 	copySource := req.Header.Get(CopySourceHeader)
-
 	if len(copySource) == 0 {
 		return permissions.Node{
 			Permission: permissions.Permission{
@@ -298,6 +298,23 @@ func handlePut(w http.ResponseWriter, req *http.Request, o *PathOperation) {
 	o.Incr("put_object", o.Principal, o.Repository.Name, o.Reference)
 	storageClass := StorageClassFromHeader(req.Header)
 	opts := block.PutOpts{StorageClass: storageClass}
+	// check and validate whether if-none-match header provided
+	allowOverwrite, err := o.checkIfAbsent(req)
+	if err != nil {
+		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrNotImplemented))
+		return
+	}
+	// before writing body, ensure preconditions - this means we essentially check for object existence twice:
+	// once here, before uploading the body to save resources and time,
+	// and then graveler will check again when passed a SetOptions.
+	if !allowOverwrite {
+		_, err := o.Catalog.GetEntry(req.Context(), o.Repository.Name, o.Reference, o.Path, catalog.GetEntryParams{})
+		if err == nil {
+			// In case object exists in catalog, no error returns
+			_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrPreconditionFailed))
+			return
+		}
+	}
 	address := o.PathProvider.NewPath()
 	blob, err := upload.WriteBlob(req.Context(), o.BlockStore, o.Repository.StorageNamespace, address, req.Body, req.ContentLength, opts)
 	if err != nil {
@@ -309,7 +326,11 @@ func handlePut(w http.ResponseWriter, req *http.Request, o *PathOperation) {
 	// write metadata
 	metadata := amzMetaAsMetadata(req)
 	contentType := req.Header.Get("Content-Type")
-	err = o.finishUpload(req, &blob.CreationDate, blob.Checksum, blob.PhysicalAddress, blob.Size, true, metadata, contentType)
+	err = o.finishUpload(req, &blob.CreationDate, blob.Checksum, blob.PhysicalAddress, blob.Size, true, metadata, contentType, allowOverwrite)
+	if errors.Is(err, graveler.ErrPreconditionFailed) {
+		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrPreconditionFailed))
+		return
+	}
 	if errors.Is(err, graveler.ErrWriteToProtectedBranch) {
 		_ = o.EncodeError(w, req, err, gatewayErrors.Codes.ToAPIErr(gatewayErrors.ErrWriteToProtectedBranch))
 		return
@@ -325,3 +346,14 @@ func handlePut(w http.ResponseWriter, req *http.Request, o *PathOperation) {
 	o.SetHeader(w, "ETag", httputil.ETag(blob.Checksum))
 	w.WriteHeader(http.StatusOK)
 }
+
+func (o *PathOperation) checkIfAbsent(req *http.Request) (bool, error) {
+	headerValue := req.Header.Get(IfNoneMatchHeader)
+	if headerValue == "" {
+		return true, nil
+	}
+	if headerValue == "*" {
+		return false, nil
+	}
+	return false, gatewayErrors.ErrNotImplemented
+}