portal/storage/file.go

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package storage
import (
"encoding/hex"
"errors"
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"git.lumeweb.com/LumeWeb/libs5-go/encoding"
"git.lumeweb.com/LumeWeb/libs5-go/types"
"git.lumeweb.com/LumeWeb/portal/db/models"
"git.lumeweb.com/LumeWeb/portal/interfaces"
"io"
"time"
)
var (
_ io.ReadSeekCloser = (*File)(nil)
)
type File struct {
reader io.ReadCloser
hash []byte
storage interfaces.StorageService
record *models.Upload
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cid *encoding.CID
}
func NewFile(hash []byte, storage interfaces.StorageService) *File {
return &File{hash: hash, storage: storage}
}
func (f *File) Exists() bool {
exists, _ := f.storage.FileExists(f.hash)
return exists
}
func (f *File) Read(p []byte) (n int, err error) {
err = f.init(0)
if err != nil {
return 0, err
}
return f.reader.Read(p)
}
func (f *File) Seek(offset int64, whence int) (int64, error) {
switch whence {
case io.SeekStart:
if f.reader != nil {
err := f.reader.Close()
if err != nil {
return 0, err
}
f.reader = nil
}
err := f.init(offset)
if err != nil {
return 0, err
}
case io.SeekCurrent:
return 0, errors.New("not supported")
case io.SeekEnd:
return int64(f.Size()), nil
default:
return 0, errors.New("invalid whence")
}
return 0, nil
}
func (f *File) Close() error {
if f.reader != nil {
r := f.reader
f.reader = nil
return r.Close()
}
return nil
}
func (f *File) init(offset int64) error {
if f.reader == nil {
reader, _, err := f.storage.GetFile(f.hash, offset)
if err != nil {
return err
}
f.reader = reader
}
return nil
}
func (f *File) Record() (*models.Upload, error) {
if f.record == nil {
exists, record := f.storage.FileExists(f.hash)
if !exists {
return nil, errors.New("file does not exist")
}
f.record = &record
}
return f.record, nil
}
func (f *File) Hash() []byte {
hashStr := f.HashString()
if hashStr == "" {
return nil
}
str, err := hex.DecodeString(hashStr)
if err != nil {
return nil
}
return str
}
func (f *File) HashString() string {
record, err := f.Record()
if err != nil {
return ""
}
return record.Hash
}
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func (f *File) Name() string {
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cid, _ := f.CID().ToString()
return cid
}
func (f *File) Modtime() time.Time {
record, err := f.Record()
if err != nil {
return time.Unix(0, 0)
}
return record.CreatedAt
}
func (f *File) Size() uint64 {
record, err := f.Record()
if err != nil {
return 0
}
return record.Size
}
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func (f *File) CID() *encoding.CID {
if f.cid == nil {
multihash := encoding.MultihashFromBytes(f.Hash(), types.HashTypeBlake3)
cid := encoding.NewCID(types.CIDTypeRaw, *multihash, f.Size())
f.cid = cid
}
return f.cid
}