package s3api import ( "context" "encoding/xml" "fmt" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants" "io" "net/http" "net/url" "strconv" "strings" "time" "github.com/seaweedfs/seaweedfs/weed/filer" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" "github.com/seaweedfs/seaweedfs/weed/s3api/s3err" ) type ListBucketResultV2 struct { XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListBucketResult"` Name string `xml:"Name"` Prefix string `xml:"Prefix"` MaxKeys int `xml:"MaxKeys"` Delimiter string `xml:"Delimiter,omitempty"` IsTruncated bool `xml:"IsTruncated"` Contents []ListEntry `xml:"Contents,omitempty"` CommonPrefixes []PrefixEntry `xml:"CommonPrefixes,omitempty"` ContinuationToken string `xml:"ContinuationToken,omitempty"` NextContinuationToken string `xml:"NextContinuationToken,omitempty"` KeyCount int `xml:"KeyCount"` StartAfter string `xml:"StartAfter,omitempty"` } func (s3a *S3ApiServer) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) { // https://docs.aws.amazon.com/AmazonS3/latest/API/v2-RESTBucketGET.html // collect parameters bucket, _ := s3_constants.GetBucketAndObject(r) glog.V(3).Infof("ListObjectsV2Handler %s", bucket) originalPrefix, continuationToken, startAfter, delimiter, _, maxKeys := getListObjectsV2Args(r.URL.Query()) if maxKeys < 0 { s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys) return } marker := continuationToken if continuationToken == "" { marker = startAfter } response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter) if err != nil { s3err.WriteErrorResponse(w, r, s3err.ErrInternalError) return } if len(response.Contents) == 0 { if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists { s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket) return } } responseV2 := &ListBucketResultV2{ XMLName: response.XMLName, Name: response.Name, CommonPrefixes: response.CommonPrefixes, Contents: response.Contents, ContinuationToken: continuationToken, Delimiter: response.Delimiter, IsTruncated: response.IsTruncated, KeyCount: len(response.Contents) + len(response.CommonPrefixes), MaxKeys: response.MaxKeys, NextContinuationToken: response.NextMarker, Prefix: response.Prefix, StartAfter: startAfter, } writeSuccessResponseXML(w, r, responseV2) } func (s3a *S3ApiServer) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) { // https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html // collect parameters bucket, _ := s3_constants.GetBucketAndObject(r) glog.V(3).Infof("ListObjectsV1Handler %s", bucket) originalPrefix, marker, delimiter, maxKeys := getListObjectsV1Args(r.URL.Query()) if maxKeys < 0 { s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys) return } response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter) if err != nil { s3err.WriteErrorResponse(w, r, s3err.ErrInternalError) return } if len(response.Contents) == 0 { if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists { s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket) return } } writeSuccessResponseXML(w, r, response) } func (s3a *S3ApiServer) listFilerEntries(bucket string, originalPrefix string, maxKeys int, originalMarker string, delimiter string) (response ListBucketResult, err error) { // convert full path prefix into directory name and prefix for entry name requestDir, prefix, marker := normalizePrefixMarker(originalPrefix, originalMarker) bucketPrefix := fmt.Sprintf("%s/%s/", s3a.option.BucketsPath, bucket) reqDir := bucketPrefix[:len(bucketPrefix)-1] if requestDir != "" { reqDir = fmt.Sprintf("%s%s", bucketPrefix, requestDir) } var contents []ListEntry var commonPrefixes []PrefixEntry var doErr error var nextMarker string cursor := &ListingCursor{ maxKeys: maxKeys, prefixEndsOnDelimiter: strings.HasSuffix(originalPrefix, "/") && len(originalMarker) == 0, } // check filer err = s3a.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { for { empty := true nextMarker, doErr = s3a.doListFilerEntries(client, reqDir, prefix, cursor, marker, delimiter, false, func(dir string, entry *filer_pb.Entry) { empty = false if entry.IsDirectory { if entry.IsDirectoryKeyObject() { contents = append(contents, ListEntry{ Key: fmt.Sprintf("%s/%s/", dir, entry.Name)[len(bucketPrefix):], LastModified: time.Unix(entry.Attributes.Mtime, 0).UTC(), ETag: "\"" + filer.ETag(entry) + "\"", Owner: CanonicalUser{ ID: fmt.Sprintf("%x", entry.Attributes.Uid), DisplayName: entry.Attributes.UserName, }, StorageClass: "STANDARD", }) cursor.maxKeys-- // https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html } else if delimiter == "/" { // A response can contain CommonPrefixes only if you specify a delimiter. commonPrefixes = append(commonPrefixes, PrefixEntry{ Prefix: fmt.Sprintf("%s/%s/", dir, entry.Name)[len(bucketPrefix):], }) //All of the keys (up to 1,000) rolled up into a common prefix count as a single return when calculating the number of returns. cursor.maxKeys-- } } else { var delimiterFound bool if delimiter != "" { // keys that contain the same string between the prefix and the first occurrence of the delimiter are grouped together as a commonPrefix. // extract the string between the prefix and the delimiter and add it to the commonPrefixes if it's unique. undelimitedPath := fmt.Sprintf("%s/%s", dir, entry.Name)[len(bucketPrefix):] // take into account a prefix if supplied while delimiting. undelimitedPath = strings.TrimPrefix(undelimitedPath, originalPrefix) delimitedPath := strings.SplitN(undelimitedPath, delimiter, 2) if len(delimitedPath) == 2 { // S3 clients expect the delimited prefix to contain the delimiter and prefix. delimitedPrefix := originalPrefix + delimitedPath[0] + delimiter for i := range commonPrefixes { if commonPrefixes[i].Prefix == delimitedPrefix { delimiterFound = true break } } if !delimiterFound { commonPrefixes = append(commonPrefixes, PrefixEntry{ Prefix: delimitedPrefix, }) cursor.maxKeys-- delimiterFound = true } } } if !delimiterFound { storageClass := "STANDARD" if v, ok := entry.Extended[s3_constants.AmzStorageClass]; ok { storageClass = string(v) } contents = append(contents, ListEntry{ Key: fmt.Sprintf("%s/%s", dir, entry.Name)[len(bucketPrefix):], LastModified: time.Unix(entry.Attributes.Mtime, 0).UTC(), ETag: "\"" + filer.ETag(entry) + "\"", Size: int64(filer.FileSize(entry)), Owner: CanonicalUser{ ID: fmt.Sprintf("%x", entry.Attributes.Uid), DisplayName: entry.Attributes.UserName, }, StorageClass: StorageClass(storageClass), }) cursor.maxKeys-- } } }) if doErr != nil { return doErr } if cursor.isTruncated { if requestDir != "" { nextMarker = requestDir + "/" + nextMarker } break } else if empty || strings.HasSuffix(originalPrefix, "/") { nextMarker = "" break } else { // start next loop marker = nextMarker } } response = ListBucketResult{ Name: bucket, Prefix: originalPrefix, Marker: originalMarker, NextMarker: nextMarker, MaxKeys: maxKeys, Delimiter: delimiter, IsTruncated: cursor.isTruncated, Contents: contents, CommonPrefixes: commonPrefixes, } return nil }) return } type ListingCursor struct { maxKeys int isTruncated bool prefixEndsOnDelimiter bool } // the prefix and marker may be in different directories // normalizePrefixMarker ensures the prefix and marker both starts from the same directory func normalizePrefixMarker(prefix, marker string) (alignedDir, alignedPrefix, alignedMarker string) { // alignedDir should not end with "/" // alignedDir, alignedPrefix, alignedMarker should only have "/" in middle if len(marker) == 0 { prefix = strings.Trim(prefix, "/") } else { prefix = strings.TrimLeft(prefix, "/") } marker = strings.TrimLeft(marker, "/") if prefix == "" { return "", "", marker } if marker == "" { alignedDir, alignedPrefix = toDirAndName(prefix) return } if !strings.HasPrefix(marker, prefix) { // something wrong return "", prefix, marker } if strings.HasPrefix(marker, prefix+"/") { alignedDir = prefix alignedPrefix = "" alignedMarker = marker[len(alignedDir)+1:] return } alignedDir, alignedPrefix = toDirAndName(prefix) if alignedDir != "" { alignedMarker = marker[len(alignedDir)+1:] } else { alignedMarker = marker } return } func toDirAndName(dirAndName string) (dir, name string) { sepIndex := strings.LastIndex(dirAndName, "/") if sepIndex >= 0 { dir, name = dirAndName[0:sepIndex], dirAndName[sepIndex+1:] } else { name = dirAndName } return } func toParentAndDescendants(dirAndName string) (dir, name string) { sepIndex := strings.Index(dirAndName, "/") if sepIndex >= 0 { dir, name = dirAndName[0:sepIndex], dirAndName[sepIndex+1:] } else { name = dirAndName } return } func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, dir, prefix string, cursor *ListingCursor, marker, delimiter string, inclusiveStartFrom bool, eachEntryFn func(dir string, entry *filer_pb.Entry)) (nextMarker string, err error) { // invariants // prefix and marker should be under dir, marker may contain "/" // maxKeys should be updated for each recursion // glog.V(4).Infof("doListFilerEntries dir: %s, prefix: %s, marker %s, maxKeys: %d, prefixEndsOnDelimiter: %+v", dir, prefix, marker, cursor.maxKeys, cursor.prefixEndsOnDelimiter) if prefix == "/" && delimiter == "/" { return } if cursor.maxKeys <= 0 { return } if strings.Contains(marker, "/") { subDir, subMarker := toParentAndDescendants(marker) // println("doListFilerEntries dir", dir+"/"+subDir, "subMarker", subMarker) subNextMarker, subErr := s3a.doListFilerEntries(client, dir+"/"+subDir, "", cursor, subMarker, delimiter, false, eachEntryFn) if subErr != nil { err = subErr return } nextMarker = subDir + "/" + subNextMarker // finished processing this subdirectory marker = subDir } if cursor.isTruncated { return } // now marker is also a direct child of dir request := &filer_pb.ListEntriesRequest{ Directory: dir, Prefix: prefix, Limit: uint32(cursor.maxKeys + 2), // bucket root directory needs to skip additional s3_constants.MultipartUploadsFolder folder StartFromFileName: marker, InclusiveStartFrom: inclusiveStartFrom, } if cursor.prefixEndsOnDelimiter { request.Limit = uint32(1) } ctx, cancel := context.WithCancel(context.Background()) defer cancel() stream, listErr := client.ListEntries(ctx, request) if listErr != nil { err = fmt.Errorf("list entires %+v: %v", request, listErr) return } for { resp, recvErr := stream.Recv() if recvErr != nil { if recvErr == io.EOF { break } else { err = fmt.Errorf("iterating entires %+v: %v", request, recvErr) return } } if cursor.maxKeys <= 0 { cursor.isTruncated = true continue } entry := resp.Entry nextMarker = entry.Name if cursor.prefixEndsOnDelimiter { if entry.Name == prefix && entry.IsDirectory { if delimiter != "/" { cursor.prefixEndsOnDelimiter = false } } else { continue } } if entry.IsDirectory { // glog.V(4).Infof("List Dir Entries %s, file: %s, maxKeys %d", dir, entry.Name, cursor.maxKeys) if entry.Name == s3_constants.MultipartUploadsFolder { // FIXME no need to apply to all directories. this extra also affects maxKeys continue } if delimiter != "/" || cursor.prefixEndsOnDelimiter { if cursor.prefixEndsOnDelimiter { cursor.prefixEndsOnDelimiter = false if entry.IsDirectoryKeyObject() { eachEntryFn(dir, entry) } } else { eachEntryFn(dir, entry) } subNextMarker, subErr := s3a.doListFilerEntries(client, dir+"/"+entry.Name, "", cursor, "", delimiter, false, eachEntryFn) if subErr != nil { err = fmt.Errorf("doListFilerEntries2: %v", subErr) return } // println("doListFilerEntries2 dir", dir+"/"+entry.Name, "subNextMarker", subNextMarker) nextMarker = entry.Name + "/" + subNextMarker if cursor.isTruncated { return } // println("doListFilerEntries2 nextMarker", nextMarker) } else { var isEmpty bool if !s3a.option.AllowEmptyFolder && entry.IsOlderDir() { //if isEmpty, err = s3a.ensureDirectoryAllEmpty(client, dir, entry.Name); err != nil { // glog.Errorf("check empty folder %s: %v", dir, err) //} } if !isEmpty { eachEntryFn(dir, entry) } } } else { eachEntryFn(dir, entry) // glog.V(4).Infof("List File Entries %s, file: %s, maxKeys %d", dir, entry.Name, cursor.maxKeys) } if cursor.prefixEndsOnDelimiter { cursor.prefixEndsOnDelimiter = false } } return } func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int) { prefix = values.Get("prefix") token = values.Get("continuation-token") startAfter = values.Get("start-after") delimiter = values.Get("delimiter") if values.Get("max-keys") != "" { maxkeys, _ = strconv.Atoi(values.Get("max-keys")) } else { maxkeys = maxObjectListSizeLimit } fetchOwner = values.Get("fetch-owner") == "true" return } func getListObjectsV1Args(values url.Values) (prefix, marker, delimiter string, maxkeys int) { prefix = values.Get("prefix") marker = values.Get("marker") delimiter = values.Get("delimiter") if values.Get("max-keys") != "" { maxkeys, _ = strconv.Atoi(values.Get("max-keys")) } else { maxkeys = maxObjectListSizeLimit } return } func (s3a *S3ApiServer) ensureDirectoryAllEmpty(filerClient filer_pb.SeaweedFilerClient, parentDir, name string) (isEmpty bool, err error) { // println("+ ensureDirectoryAllEmpty", dir, name) glog.V(4).Infof("+ isEmpty %s/%s", parentDir, name) defer glog.V(4).Infof("- isEmpty %s/%s %v", parentDir, name, isEmpty) var fileCounter int var subDirs []string currentDir := parentDir + "/" + name var startFrom string var isExhausted bool var foundEntry bool for fileCounter == 0 && !isExhausted && err == nil { err = filer_pb.SeaweedList(filerClient, currentDir, "", func(entry *filer_pb.Entry, isLast bool) error { foundEntry = true if entry.IsOlderDir() { subDirs = append(subDirs, entry.Name) } else { fileCounter++ } startFrom = entry.Name isExhausted = isExhausted || isLast glog.V(4).Infof(" * %s/%s isLast: %t", currentDir, startFrom, isLast) return nil }, startFrom, false, 8) if !foundEntry { break } } if err != nil { return false, err } if fileCounter > 0 { return false, nil } for _, subDir := range subDirs { isSubEmpty, subErr := s3a.ensureDirectoryAllEmpty(filerClient, currentDir, subDir) if subErr != nil { return false, subErr } if !isSubEmpty { return false, nil } } glog.V(1).Infof("deleting empty folder %s", currentDir) if err = doDeleteEntry(filerClient, parentDir, name, true, false); err != nil { return } return true, nil }