410dd20032
Sort file entries by path (lexicographic, byte-order) before serialization to ensure deterministic output. Add fixedUUID support for testing reproducibility, and a test asserting byte-identical output from two runs with the same input. Closes #23
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
package mfer
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import (
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"bytes"
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"encoding/hex"
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"errors"
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"fmt"
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"github.com/multiformats/go-multihash"
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)
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// manifest holds the internal representation of a manifest file.
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// Use NewManifestFromFile or NewManifestFromReader to load an existing manifest,
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// or use Builder to create a new one.
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type manifest struct {
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pbInner *MFFile
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pbOuter *MFFileOuter
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output *bytes.Buffer
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signingOptions *SigningOptions
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fixedUUID []byte // if set, use this UUID instead of generating one
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}
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func (m *manifest) String() string {
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count := 0
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if m.pbInner != nil {
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count = len(m.pbInner.Files)
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}
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return fmt.Sprintf("<Manifest count=%d>", count)
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}
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// Files returns all file entries from a loaded manifest.
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func (m *manifest) Files() []*MFFilePath {
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if m.pbInner == nil {
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return nil
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}
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return m.pbInner.Files
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}
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// signatureString generates the canonical string used for signing/verification.
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// Format: MAGIC-UUID-MULTIHASH where UUID and multihash are hex-encoded.
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// Requires pbOuter to be set with Uuid and Sha256 fields.
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func (m *manifest) signatureString() (string, error) {
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if m.pbOuter == nil {
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return "", errors.New("pbOuter not set")
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}
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if len(m.pbOuter.Uuid) == 0 {
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return "", errors.New("UUID not set")
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}
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if len(m.pbOuter.Sha256) == 0 {
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return "", errors.New("SHA256 hash not set")
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}
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mh, err := multihash.Encode(m.pbOuter.Sha256, multihash.SHA2_256)
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if err != nil {
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return "", fmt.Errorf("failed to encode multihash: %w", err)
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}
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uuidStr := hex.EncodeToString(m.pbOuter.Uuid)
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mhStr := hex.EncodeToString(mh)
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return fmt.Sprintf("%s-%s-%s", MAGIC, uuidStr, mhStr), nil
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}
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