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folders-hidden.go
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/
folders-hidden.go
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package mc
import (
"context"
"crypto/md5"
"fmt"
"io"
"path"
"strings"
"github.com/minio/minio-go/v7"
"github.com/pborman/uuid"
"github.com/pydio/cells/v4/common"
"github.com/pydio/cells/v4/common/nodes/models"
)
const (
metaFolderUUID = "X-Amz-Meta-Cells-Folder-Uuid"
)
type HiddenFoldersWrapper struct {
*Client
translateHidden string
}
func (c *HiddenFoldersWrapper) GetObject(ctx context.Context, bucketName, objectName string, opts models.ReadMeta) (io.ReadCloser, models.ObjectInfo, error) {
getOpts := c.readMetaToMinioOpts(ctx, opts)
if emptyKey, ok := c.hiddenToEmpty(objectName); ok {
return c.readEmptyMetaAsContent(ctx, bucketName, emptyKey, getOpts)
}
return c.Client.GetObject(ctx, bucketName, objectName, opts)
}
func (c *HiddenFoldersWrapper) StatObject(ctx context.Context, bucketName, objectName string, opts models.ReadMeta) (models.ObjectInfo, error) {
if emptyKey, o := c.hiddenToEmpty(objectName); o {
return c.getHiddenObjectInfo(ctx, bucketName, objectName, emptyKey, c.readMetaToMinioOpts(ctx, opts))
}
return c.Client.StatObject(ctx, bucketName, objectName, opts)
}
func (c *HiddenFoldersWrapper) PutObject(ctx context.Context, bucketName, objectName string, reader io.Reader, objectSize int64, opts models.PutMeta) (n models.ObjectInfo, err error) {
if emptyKey, o := c.hiddenToEmpty(objectName); o {
return c.putContentAsEmptyMeta(ctx, bucketName, objectName, emptyKey, reader, opts)
}
return c.Client.PutObject(ctx, bucketName, objectName, reader, objectSize, opts)
}
func (c *HiddenFoldersWrapper) RemoveObject(ctx context.Context, bucketName, objectName string) error {
objectName, _ = c.hiddenToEmpty(objectName)
return c.Client.RemoveObject(ctx, bucketName, objectName)
}
func (c *HiddenFoldersWrapper) CopyObject(ctx context.Context, sourceBucket, sourceObject, destBucket, destObject string, srcMeta, metadata map[string]string, progress io.Reader) (models.ObjectInfo, error) {
sourceObject, _ = c.hiddenToEmpty(sourceObject)
destObject, _ = c.hiddenToEmpty(destObject)
return c.Client.CopyObject(ctx, sourceBucket, sourceObject, destBucket, destObject, srcMeta, metadata, progress)
}
func (c *HiddenFoldersWrapper) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, max ...int) (result models.ListBucketResult, err error) {
recursive := true
if delimiter == "/" {
recursive = false
}
limit := 0
if len(max) > 0 && max[0] > 0 {
limit = max[0]
var can context.CancelFunc
ctx, can = context.WithCancel(ctx)
defer can()
}
ch := c.mc.Client.ListObjects(ctx, bucket, minio.ListObjectsOptions{
Prefix: prefix,
Recursive: recursive,
StartAfter: marker,
})
r := models.ListBucketResult{
Delimiter: delimiter,
Marker: marker,
Name: bucket,
Prefix: prefix,
}
i := 0
var cc []models.ObjectInfo
for oi := range ch {
if oi.Err != nil {
return result, oi.Err
}
i++
cc = append(cc, minioInfoToModelsInfo(oi))
/*
if strings.HasSuffix(oi.Key, "/") {
r.CommonPrefixes = append(r.CommonPrefixes, models.CommonPrefix{Prefix: oi.Key})
} else {
r.Contents = append(r.Contents, minioInfoToModelsInfo(oi))
}
*/
if limit > 0 && i >= limit {
break
}
}
cc = c.updateListingResults(ctx, bucket, cc)
for _, o := range cc {
if strings.HasSuffix(o.Key, "/") {
r.CommonPrefixes = append(r.CommonPrefixes, models.CommonPrefix{Prefix: o.Key})
} else {
r.Contents = append(r.Contents, o)
}
}
return r, nil
}
func (c *HiddenFoldersWrapper) updateListingResults(ctx context.Context, bucket string, contents []models.ObjectInfo) (output []models.ObjectInfo) {
existingPydios := make(map[string]models.ObjectInfo)
for _, o := range contents {
if e, t := c.hiddenToEmpty(o.Key); t {
existingPydios[e] = o
}
}
for _, oi := range contents {
oo, changed, ignore := c.updateListingEntry(ctx, bucket, oi, existingPydios)
if ignore {
continue
}
if changed {
output = append(output, oo)
} else {
output = append(output, oi)
}
}
return
}
// updateListingEntry tries does two things : transform on-the-fly empty objects with Uuid meta to fake .pydio,
// and if a .pydio does really exist, get the Uuid from its content and attach it to an empty object, then delete it (migration).
func (c *HiddenFoldersWrapper) updateListingEntry(ctx context.Context, bucket string, oi models.ObjectInfo, pydios map[string]models.ObjectInfo) (models.ObjectInfo, bool, bool) {
if h, ok := c.emptyToHidden(oi.Key); ok {
emptyOi, err := c.mc.StatObject(ctx, bucket, oi.Key, minio.StatObjectOptions{})
if err != nil {
//fmt.Println("86 cannot stat empty object")
return oi, false, false
}
var uid string
if id, has := emptyOi.Metadata[metaFolderUUID]; has {
//fmt.Println("empty has Uuid", id)
uid = strings.Join(id, "")
} else if _, hasP := pydios[oi.Key]; hasP {
//fmt.Println("empty will be migrated at next step, ignore")
// This will be migrated at next step, return ignore
return oi, false, true
} else {
//fmt.Println("empty - create an uuid and attach it as meta")
// Create an Uuid and attach it as meta to existing empty folder object
uid = uuid.New()
newMeta := map[string]string{
common.XAmzMetaDirective: "REPLACE",
metaFolderUUID: uid,
}
srcOptions := minio.CopySrcOptions{
Bucket: bucket,
Object: oi.Key,
}
destOptions := minio.PutObjectOptions{}
if _, e := c.mc.CopyObject(ctx, bucket, oi.Key, bucket, oi.Key, newMeta, srcOptions, destOptions); e != nil {
fmt.Println("[INFO] Could not attach metadata to existing empty object", oi.Key, " - err was ", e.Error())
}
}
oi.Size = int64(len(uid))
mH := md5.New()
mH.Write([]byte(uid))
oi.ETag = fmt.Sprintf("%x", mH.Sum(nil))
oi.Key = h
return oi, true, false
} else if empty, o2 := c.hiddenToEmpty(oi.Key); o2 {
// This is an existing .pydio - migrate it to empty folder with meta instead, and let it go through the listing
fmt.Println("[INFO] Migrating .pydio to S3 empty object")
reader, _, _, er := c.mc.GetObject(ctx, bucket, oi.Key, minio.GetObjectOptions{})
if er == nil {
//fmt.Println("hidden - got reader")
data, _ := io.ReadAll(reader)
uid := strings.TrimSpace(string(data))
var e error
if _, err := c.mc.StatObject(ctx, bucket, empty, minio.StatObjectOptions{}); err == nil {
//fmt.Println("hidden - got corresponding empty folder, attach meta to it")
// Attach the Uuid as meta to existing empty folder object
newMeta := map[string]string{
common.XAmzMetaDirective: "REPLACE",
metaFolderUUID: uid,
}
srcOptions := minio.CopySrcOptions{
Bucket: bucket,
Object: empty,
}
destOptions := minio.PutObjectOptions{}
if _, e = c.mc.CopyObject(ctx, bucket, empty, bucket, empty, newMeta, srcOptions, destOptions); e != nil {
fmt.Println("[INFO] Could not attach metadata to existing empty object", empty, " - err was ", e.Error())
} else {
//fmt.Println("hidden - got corresponding empty folder, attached meta OK")
}
} else {
//fmt.Println("hidden - create an empty object with meta")
if _, e = c.mc.PutObject(ctx, bucket, empty, strings.NewReader(""), 0, "", "", minio.PutObjectOptions{UserMetadata: map[string]string{metaFolderUUID: uid}}); e != nil {
fmt.Println("[INFO] Could not create empty object to replace .pydio", empty, " - err was ", e.Error())
}
}
if e == nil {
//fmt.Println("hidden - now delete original .pydio")
// Now delete original file .pydio
if err := c.mc.RemoveObject(ctx, bucket, oi.Key, minio.RemoveObjectOptions{}); err != nil {
fmt.Println("[INFO] Could not remove legacy .pydio file on bucket")
}
}
}
}
return oi, false, false
}
func (c *HiddenFoldersWrapper) putContentAsEmptyMeta(ctx context.Context, bucket, object, emptyKey string, data io.Reader, opts models.PutMeta) (models.ObjectInfo, error) {
content, er := io.ReadAll(data)
if er != nil {
return models.ObjectInfo{}, er
}
meta := map[string]string{metaFolderUUID: string(content)}
for k, v := range opts.UserMetadata {
meta[k] = v
}
putOpts := minio.PutObjectOptions{UserMetadata: meta}
oi, err := c.mc.PutObject(ctx, bucket, emptyKey, strings.NewReader(""), 0, "", "", putOpts)
if err == nil {
oi.Size = 36 // Manually update size for notification
}
return minioUploadInfoToModelsInfo(opts, oi), err
}
type srcloser struct {
io.Reader
}
func (s *srcloser) Close() error {
return nil
}
func (c *HiddenFoldersWrapper) readEmptyMetaAsContent(ctx context.Context, bucket, emptyKey string, st minio.StatObjectOptions) (io.ReadCloser, models.ObjectInfo, error) {
oi, err := c.mc.StatObject(ctx, bucket, emptyKey, st)
if err != nil {
return nil, models.ObjectInfo{}, err
}
if id, has := oi.Metadata[metaFolderUUID]; has {
rc := strings.NewReader(strings.Join(id, ""))
return &srcloser{Reader: rc}, minioInfoToModelsInfo(oi), nil
}
return nil, models.ObjectInfo{}, fmt.Errorf("no attached id found")
}
func (c *HiddenFoldersWrapper) getHiddenObjectInfo(ctx context.Context, bucket, object, emptyKey string, st minio.StatObjectOptions) (models.ObjectInfo, error) {
oi, err := c.mc.StatObject(ctx, bucket, emptyKey, st)
if err != nil {
return models.ObjectInfo{}, err //minio.ErrorRespToObjectError(err, bucket, object)
}
mo := minioInfoToModelsInfo(oi)
if id, has := oi.Metadata[metaFolderUUID]; has {
uid := strings.Join(id, "")
mo.Size = int64(len(uid))
mo.Key = object
mH := md5.New()
mH.Write([]byte(uid))
mo.ETag = fmt.Sprintf("%x", mH.Sum(nil))
}
return mo, nil
}
func (c *HiddenFoldersWrapper) hiddenToEmpty(k string) (string, bool) {
if c.translateHidden != "" && strings.HasSuffix(k, c.translateHidden) && path.Dir(k) != "." {
return path.Dir(k) + "/", true
}
return k, false
}
func (c *HiddenFoldersWrapper) emptyToHidden(k string) (string, bool) {
if c.translateHidden != "" && strings.HasSuffix(k, "/") {
return k + c.translateHidden, true
}
return k, false
}