98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
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package meta
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import (
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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)
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type Meta struct {
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Params
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Name string `json:"name"`
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ShardMerkle FileHash `json:"shardMerkle"`
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ShardHashes HashList `json:"shardHashes"`
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ParityMerkle FileHash `json:"parityMerkle"`
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ParityHashes HashList `json:"parityHashes"`
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}
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type FileHash []byte
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func (hash FileHash) MarshalJSON() ([]byte, error) {
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text, err := hash.MarshalText()
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if err != nil {
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return nil, err
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}
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return json.Marshal(string(text))
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}
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func (hash FileHash) MarshalText() ([]byte, error) {
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return []byte(base64.StdEncoding.EncodeToString(hash)), nil
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}
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func (hash *FileHash) UnmarshalJSON(data []byte) error {
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s := ""
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json.Unmarshal(data, &s)
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return hash.UnmarshalText([]byte(s))
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}
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func (hash *FileHash) UnmarshalText(text []byte) error {
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raw, err := base64.StdEncoding.DecodeString(string(text))
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if err != nil {
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return err
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}
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if len(raw) != sha256.Size {
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return fmt.Errorf("expected hash to be %d bytes (got %d)", sha256.Size, len(raw))
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}
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*hash = raw
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return nil
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}
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type HashList [][]byte
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func (hashes HashList) MarshalJSON() ([]byte, error) {
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text, err := hashes.MarshalText()
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if err != nil {
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return nil, err
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}
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return json.Marshal(string(text))
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}
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func (hashes HashList) MarshalText() ([]byte, error) {
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// fmt.Printf("marshal hash list...\n")
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hashesLen := len(hashes)
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hashLen := 0
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dataLen := 0
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if hashesLen != 0 {
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hashLen = len(hashes[0])
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dataLen = hashesLen * hashLen
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}
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data := make([]byte, dataLen)
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for i, hash := range hashes {
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copy(data[i*hashLen:], hash)
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}
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return []byte(base64.StdEncoding.EncodeToString(data)), nil
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}
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func (hashes *HashList) UnmarshalJSON(data []byte) error {
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s := ""
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json.Unmarshal(data, &s)
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return hashes.UnmarshalText([]byte(s))
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}
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func (hashes *HashList) UnmarshalText(text []byte) error {
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raw, err := base64.StdEncoding.DecodeString(string(text))
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if err != nil {
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return err
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}
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if len(raw)%sha256.Size != 0 {
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return fmt.Errorf("expected hash list to be multiple of %d bytes", sha256.Size)
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}
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split := make([][]byte, len(raw)/sha256.Size)
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for i := 0; i < len(raw); i += sha256.Size {
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split[i/sha256.Size] = raw[i : i+sha256.Size]
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}
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*hashes = split
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return nil
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}
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