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metadata.go
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metadata.go
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package tep64
import (
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"github.com/tonkeeper/tongo/boc"
"github.com/tonkeeper/tongo/tlb"
)
type ContentLayout int
const (
Undefined ContentLayout = iota
OffChain
OnChain
SemiChain
)
type Metadata struct {
// Uri points to JSON document with metadata. Used by SemiChain layout. ASCII string.
Uri string `json:"uri,omitempty"`
Name string `json:"name,omitempty"`
Description string `json:"description,omitempty"`
Image string `json:"image,omitempty"`
ImageData []byte `json:"image_data,omitempty"`
Symbol string `json:"symbol,omitempty"`
Decimals string `json:"decimals,omitempty"`
RenderType string `json:"render_type,omitempty"`
AmountStyle string `json:"amount_style,omitempty"`
}
func (m *Metadata) Merge(other *Metadata) {
if other == nil {
return
}
if other.Uri != "" {
m.Uri = other.Uri
}
if other.Name != "" {
m.Name = other.Name
}
if other.Description != "" {
m.Description = other.Description
}
if other.Image != "" {
m.Image = other.Image
}
if other.ImageData != nil {
m.ImageData = other.ImageData
}
if other.Symbol != "" {
m.Symbol = other.Symbol
}
if other.Decimals != "" {
m.Decimals = other.Decimals
}
if other.RenderType != "" {
m.RenderType = other.RenderType
}
if other.AmountStyle != "" {
m.AmountStyle = other.AmountStyle
}
}
// FullContent is either a link to metadata or metadata itself depending on the layout.
type FullContent struct {
Layout ContentLayout
Data []byte
// OnchainMetadata contains a decoded metadata when the layout is onchain.
OnchainMetadata *Metadata
// OffchainURL contains a link to JSON when the layout is offchain.
OffchainURL string
}
var (
ErrUnsupportedContentType = errors.New("unsupported content type")
)
// TEP-64 Token Data Standard
// https://github.com/ton-blockchain/TEPs/blob/master/text/0064-token-data-standard.md
func ConvertOnchainData(content tlb.FullContent) (Metadata, error) {
if content.SumType != "Onchain" {
return Metadata{}, fmt.Errorf("not Onchain content")
}
var m Metadata
for i, v := range content.Onchain.Data.Values() {
keyS := hex.EncodeToString(content.Onchain.Data.Keys()[i][:])
switch keyS {
case "70e5d7b6a29b392f85076fe15ca2f2053c56c2338728c4e33c9e8ddb1ee827cc": // sha256(uri)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Uri = string(b)
case "82a3537ff0dbce7eec35d69edc3a189ee6f17d82f353a553f9aa96cb0be3ce89": // sha256(name)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Name = string(b)
case "c9046f7a37ad0ea7cee73355984fa5428982f8b37c8f7bcec91f7ac71a7cd104": // sha256(description)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Description = string(b)
case "6105d6cc76af400325e94d588ce511be5bfdbb73b437dc51eca43917d7a43e3d": // sha256(image)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Image = string(b)
case "d9a88ccec79eef59c84b671136a20ece4cd00caaad5bc47e2c208829154ee9e4": // sha256(image_data)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.ImageData = b
case "b76a7ca153c24671658335bbd08946350ffc621fa1c516e7123095d4ffd5c581": // sha256(symbol)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Symbol = string(b)
case "ee80fd2f1e03480e2282363596ee752d7bb27f50776b95086a0279189675923e": // sha256(decimals)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.Decimals = string(b)
case "d33ae06043036d0d1c3be27201ac15ee4c73da8cdb7c8f3462ce308026095ac0": // sha256(render_type)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.RenderType = string(b)
case "8b10e058ce46c44bc1ba139bc9761721e49170e2c0a176129250a70af053b700": // sha256(amount_style)
b, err := v.Value.Bytes()
if err != nil {
return Metadata{}, err
}
m.AmountStyle = string(b)
}
}
return m, nil
}
func DecodeFullContentFromCell(cell *boc.Cell) (FullContent, error) {
var content tlb.FullContent
err := tlb.Unmarshal(cell, &content)
if err != nil {
return FullContent{}, fmt.Errorf("%v content decoding: %v", content.SumType, err)
}
return DecodeFullContent(content)
}
func DecodeFullContent(content tlb.FullContent) (FullContent, error) {
switch content.SumType {
case "Onchain":
meta, err := ConvertOnchainData(content)
if err != nil {
return FullContent{}, err
}
layout := OnChain
offchainURL := ""
if len(meta.Uri) > 0 {
// according to https://github.com/ton-blockchain/TEPs/blob/master/text/0064-token-data-standard.md
// if uri is present, then the layout is SemiChain
layout = SemiChain
}
result, err := json.Marshal(meta)
if err != nil {
return FullContent{}, err
}
return FullContent{
Layout: layout,
Data: result,
OnchainMetadata: &meta,
OffchainURL: offchainURL,
}, nil
case "Offchain":
bs := boc.BitString(content.Offchain.Uri)
if bs.BitsAvailableForRead()%8 != 0 {
return FullContent{}, fmt.Errorf("text data is not multiple of 8 bits")
}
result, err := bs.GetTopUppedArray()
if err != nil {
return FullContent{}, err
}
return FullContent{
Layout: OffChain,
Data: result,
OffchainURL: string(result),
}, nil
}
return FullContent{}, ErrUnsupportedContentType
}