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local: stricter handling of short files
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b4895ebd76
commit
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1 changed files with 19 additions and 0 deletions
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@ -2,6 +2,7 @@ package local
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import (
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"context"
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"fmt"
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"hash"
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"io"
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"os"
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@ -30,6 +31,8 @@ type Local struct {
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// ensure statically that *Local implements backend.Backend.
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var _ backend.Backend = &Local{}
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var errTooShort = fmt.Errorf("file is too short")
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func NewFactory() location.Factory {
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return location.NewLimitedBackendFactory("local", ParseConfig, location.NoPassword, limiter.WrapBackendConstructor(Create), limiter.WrapBackendConstructor(Open))
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}
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@ -110,6 +113,10 @@ func (b *Local) IsNotExist(err error) bool {
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return errors.Is(err, os.ErrNotExist)
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}
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func (b *Local) IsPermanentError(err error) bool {
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return b.IsNotExist(err) || errors.Is(err, errTooShort) || errors.Is(err, os.ErrPermission)
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}
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// Save stores data in the backend at the handle.
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func (b *Local) Save(_ context.Context, h backend.Handle, rd backend.RewindReader) (err error) {
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finalname := b.Filename(h)
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@ -219,6 +226,18 @@ func (b *Local) openReader(_ context.Context, h backend.Handle, length int, offs
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return nil, err
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}
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fi, err := f.Stat()
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if err != nil {
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_ = f.Close()
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return nil, err
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}
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size := fi.Size()
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if size < offset+int64(length) {
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_ = f.Close()
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return nil, errTooShort
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}
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if offset > 0 {
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_, err = f.Seek(offset, 0)
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if err != nil {
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