forked from TrueCloudLab/frostfs-sdk-go
104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
package erasurecode
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import (
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"fmt"
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objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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)
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// Verify verifies that parts are well formed.
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// All parts are expected to be non-nil.
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// The number of parts must be equal to `total` field of the EC header
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// and parts must be sorted by index.
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func (c *Constructor) Verify(parts []*objectSDK.Object) error {
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c.clear()
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var headerLength int
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for i := range parts {
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if parts[i] == nil {
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return ErrMalformedSlice
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}
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var err error
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headerLength, err = validatePart(parts, i, headerLength)
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if err != nil {
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return err
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}
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}
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p0 := parts[0]
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for i := 1; i < len(parts); i++ {
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// This part must be kept in sync with copyRequiredFields().
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pi := parts[i]
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if p0.OwnerID().Equals(pi.OwnerID()) {
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return fmt.Errorf("%w: owner id mismatch: %s != %s", ErrMalformedSlice, p0.OwnerID(), pi.OwnerID())
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}
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if p0.Version() == nil && pi.Version() != nil || !p0.Version().Equal(*pi.Version()) {
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return fmt.Errorf("%w: version mismatch: %s != %s", ErrMalformedSlice, p0.Version(), pi.Version())
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}
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cnr0, _ := p0.ContainerID()
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cnri, _ := pi.ContainerID()
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if !cnr0.Equals(cnri) {
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return fmt.Errorf("%w: container id mismatch: %s != %s", ErrMalformedSlice, cnr0, cnri)
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}
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}
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if err := c.fillHeader(parts); err != nil {
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return err
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}
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c.fillPayload(parts)
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ok, err := c.enc.Verify(c.headerShards)
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if err != nil {
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return err
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}
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if !ok {
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return ErrMalformedSlice
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}
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ok, err = c.enc.Verify(c.payloadShards)
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if err != nil {
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return err
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}
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if !ok {
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return ErrMalformedSlice
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}
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return nil
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}
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// copyRequiredFields sets all fields in dst which are copied from src and shared among all chunks.
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// src can be either another chunk of full object.
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// dst must be a chunk.
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func copyRequiredFields(dst *objectSDK.Object, src *objectSDK.Object) {
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dst.SetVersion(src.Version())
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dst.SetOwnerID(src.OwnerID())
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dst.SetCreationEpoch(src.CreationEpoch())
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dst.SetSessionToken(src.SessionToken())
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cnr, _ := src.ContainerID()
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dst.SetContainerID(cnr)
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}
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// validatePart makes i-th part is consistent with the rest.
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// If headerLength is not zero it is asserted to be equal in the ec header.
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// Otherwise, new headerLength is returned.
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func validatePart(parts []*objectSDK.Object, i int, headerLength int) (int, error) {
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ec := parts[i].GetECHeader()
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if ec == nil {
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return headerLength, fmt.Errorf("%w: missing EC header", ErrMalformedSlice)
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}
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if ec.Index() != uint32(i) {
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return headerLength, fmt.Errorf("%w: index=%d, ec.index=%d", ErrMalformedSlice, i, ec.Index())
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}
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if ec.Total() != uint32(len(parts)) {
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return headerLength, fmt.Errorf("%w: len(parts)=%d, total=%d", ErrMalformedSlice, len(parts), ec.Total())
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}
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if headerLength == 0 {
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return int(ec.HeaderLength()), nil
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}
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if ec.HeaderLength() != uint32(headerLength) {
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return headerLength, fmt.Errorf("%w: header length mismatch %d != %d", ErrMalformedSlice, headerLength, ec.HeaderLength())
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}
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return headerLength, nil
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}
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