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