/
verified_transfer.go
109 lines (83 loc) · 2.78 KB
/
verified_transfer.go
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package transfer
import (
"github.com/cheggaaa/pb"
"github.com/dpb587/metalink"
"github.com/dpb587/metalink/file"
"github.com/dpb587/metalink/file/metaurl"
"github.com/dpb587/metalink/file/url"
"github.com/dpb587/metalink/verification"
"github.com/pkg/errors"
)
type VerifiedTransfer struct {
metaurlLoader metaurl.Loader
urlLoader url.Loader
verifier verification.Verifier
}
func NewVerifiedTransfer(metaurlLoader metaurl.Loader, urlLoader url.Loader, verifier verification.Verifier) Transfer {
return VerifiedTransfer{
metaurlLoader: metaurlLoader,
urlLoader: urlLoader,
verifier: verifier,
}
}
func (t VerifiedTransfer) TransferFile(meta4file metalink.File, local file.Reference, progress *pb.ProgressBar, verificationResultReporter verification.VerificationResultReporter) error {
sources := newSourceList(meta4file.MetaURLs, meta4file.URLs)
errs := []error{}
for _, source := range sources {
var err error
if source.URL != nil {
err = t.transferFileURL(meta4file, local, progress, verificationResultReporter, *source.URL)
} else if source.MetaURL != nil {
err = t.transferFileMetaURL(meta4file, local, progress, verificationResultReporter, *source.MetaURL)
} else {
panic("missing url or metaurl")
}
if err == nil {
return nil
}
errs = append(errs, err)
}
if len(errs) == 0 {
return errors.New("no valid url found")
}
progress.Finish()
return errors.New(errs[0].Error())
}
func (t VerifiedTransfer) transferFileURL(meta4file metalink.File, local file.Reference, progress *pb.ProgressBar, verificationResultReporter verification.VerificationResultReporter, source metalink.URL) error {
remote, err := t.urlLoader.LoadURL(source)
if err != nil {
return errors.Wrap(err, "Parsing source file")
}
progress.Start()
err = local.WriteFrom(remote, progress)
if err != nil {
return errors.Wrap(err, "Transferring file")
}
progress.Finish()
result := t.verifier.Verify(local, meta4file)
if verificationResultReporter != nil {
verificationResultReporter.ReportVerificationResult(meta4file, result)
}
if result.Error() != nil {
return errors.Wrap(result.Error(), "Verifying file")
}
return nil
}
func (t VerifiedTransfer) transferFileMetaURL(meta4file metalink.File, local file.Reference, progress *pb.ProgressBar, _ verification.VerificationResultReporter, source metalink.MetaURL) error {
remote, err := t.metaurlLoader.LoadMetaURL(source)
if err != nil {
return errors.Wrap(err, "Parsing source file")
}
progress.Start()
err = local.WriteFrom(remote, progress)
if err != nil {
return errors.Wrap(err, "Transferring file")
}
// @todo; metaurl downloads may not match
// err = t.verifier.Verify(local, meta4file)
// if err != nil {
// return errors.Wrap(err, "Verifying file")
// }
progress.Finish()
return nil
}