add token metadat

rpc/getTokenMetaData.go

@@ -0,0 +1,49 @@
+package rpc
+
+import (
+	"bytes"
+	"context"
+
+	"github.com/gagliardetto/solana-go"
+	"github.com/mr-tron/base58"
+)
+
+// Metaplex Token Metadata
+const (
+	metaplex = "metaqbxxUerdq28cj1RbAWkYQm3ybzjb6a8bt518x1s"
+	meta     = "metadata"
+)
+
+func (cl *Client) GetTokenMetaData(mint string) (*TokenMetaData, error) {
+	b, err := base58.Decode(metaplex)
+	if err != nil {
+		return nil, err
+	}
+	seeds := [][]byte{
+		[]byte(meta),
+		b,
+		solana.MustPublicKeyFromBase58(mint).Bytes(),
+	}
+	pb, _, err := solana.FindProgramAddress(seeds, solana.MustPublicKeyFromBase58(metaplex))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := cl.GetAccountInfoWithOpts(
+		context.TODO(),
+		pb,
+		&GetAccountInfoOpts{
+			Encoding:   solana.EncodingBase64,
+			Commitment: CommitmentFinalized,
+		},
+	)
+	if err != nil {
+		return nil, err
+	}
+	metadata := &TokenMetaData{}
+	data := resp.Value.Data.GetBinary()
+	metadata.Name = string(bytes.Trim(data[69:69+32], "\x00"))
+	metadata.Symbol = string(bytes.Trim(data[105:115], "\x00"))
+	metadata.URI = string(bytes.Trim(data[116:200], "\x00"))
+
+	return metadata, err
+}

rpc/types.go

@@ -528,6 +528,12 @@ type InstructionInfo struct {
 	InstructionType string                 `json:"type"`
 }
 
+type TokenMetaData struct {
+	Name   string
+	Symbol string
+	URI    string
+}
+
 type TransactionOpts struct {
 	Encoding            solana.EncodingType `json:"encoding,omitempty"`
 	SkipPreflight       bool                `json:"skipPreflight,omitempty"`