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package storage
import (
"encoding/json"
"errors"
"io"
"path/filepath"
"unicode/utf8"
)
// ErrDuplicatePath occurs when a tar archive has more than one entry for the
// same file path
var ErrDuplicatePath = errors.New("duplicates of file paths not supported")
// Packer describes the methods to pack Entries to a storage destination
type Packer interface {
// AddEntry packs the Entry and returns its position
AddEntry(e Entry) (int, error)
}
// Unpacker describes the methods to read Entries from a source
type Unpacker interface {
// Next returns the next Entry being unpacked, or error, until io.EOF
Next() (*Entry, error)
}
type jsonUnpacker struct {
seen seenNames
dec *json.Decoder
}
func (jup *jsonUnpacker) Next() (*Entry, error) {
var e Entry
err := jup.dec.Decode(&e)
if err != nil {
return nil, err
}
// check for dup name
if e.Type == FileType {
cName := filepath.Clean(e.GetName())
if _, ok := jup.seen[cName]; ok {
return nil, ErrDuplicatePath
}
jup.seen[cName] = struct{}{}
}
return &e, err
}
// NewJSONUnpacker provides an Unpacker that reads Entries (SegmentType and
// FileType) as a json document.
//
// Each Entry read are expected to be delimited by new line.
func NewJSONUnpacker(r io.Reader) Unpacker {
return &jsonUnpacker{
dec: json.NewDecoder(r),
seen: seenNames{},
}
}
type jsonPacker struct {
w io.Writer
e *json.Encoder
pos int
seen seenNames
}
type seenNames map[string]struct{}
func (jp *jsonPacker) AddEntry(e Entry) (int, error) {
// if Name is not valid utf8, switch it to raw first.
if e.Name != "" {
if !utf8.ValidString(e.Name) {
e.NameRaw = []byte(e.Name)
e.Name = ""
}
}
// check early for dup name
if e.Type == FileType {
cName := filepath.Clean(e.GetName())
if _, ok := jp.seen[cName]; ok {
return -1, ErrDuplicatePath
}
jp.seen[cName] = struct{}{}
}
e.Position = jp.pos
err := jp.e.Encode(e)
if err != nil {
return -1, err
}
// made it this far, increment now
jp.pos++
return e.Position, nil
}
// NewJSONPacker provides a Packer that writes each Entry (SegmentType and
// FileType) as a json document.
//
// The Entries are delimited by new line.
func NewJSONPacker(w io.Writer) Packer {
return &jsonPacker{
w: w,
e: json.NewEncoder(w),
seen: seenNames{},
}
}
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