feat: claim example

example/claim/main.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"math/rand"
+	"net/http"
+
+	"github.com/xssnick/tonutils-go/address"
+	"github.com/xssnick/tonutils-go/tvm/cell"
+)
+
+const COMPRESSED_NFT_API_URL = "http://localhost:8081/v1"
+
+func main() {
+	// 1. Fetch collection state
+	resp, err := http.Get(fmt.Sprintf("%s/state", COMPRESSED_NFT_API_URL))
+	if err != nil {
+		log.Fatalln("Fetch state err:", err.Error())
+		return
+	}
+	defer resp.Body.Close()
+
+	b, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalln("ReadAll state err:", err.Error())
+		return
+	}
+
+	var state struct {
+		Address string `json:"address"`
+	}
+	err = json.Unmarshal(b, &state)
+	if err != nil {
+		log.Fatalln("Unmarshal state err:", err.Error())
+		return
+	}
+
+	// 2. Fetch proof cell for a specific item (by its index)
+	var itemIndex uint64 = 1
+	resp, err = http.Get(fmt.Sprintf("%s/items/%d", COMPRESSED_NFT_API_URL, itemIndex))
+	if err != nil {
+		log.Fatalln("Fetch item err:", err.Error())
+		return
+	}
+	defer resp.Body.Close()
+
+	b, err = io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalln("ReadAll item err:", err.Error())
+		return
+	}
+
+	var item struct {
+		ProofCellBase64 string `json:"proof_cell"`
+	}
+	err = json.Unmarshal(b, &item)
+	if err != nil {
+		log.Fatalln("Unmarshal item err:", err.Error())
+		return
+	}
+
+	// 3. Prepare payload for the claim transacation
+	proofCellDecoded, err := base64.StdEncoding.DecodeString(item.ProofCellBase64)
+	if err != nil {
+		log.Fatalln("DecodeString err:", err.Error())
+		return
+	}
+	proofCell, err := cell.FromBOC(proofCellDecoded)
+	if err != nil {
+		log.Fatalln("FromBOC err:", err.Error())
+		return
+	}
+	payload := cell.BeginCell().
+		MustStoreUInt(0x13a3ca6, 32).
+		MustStoreUInt(rand.Uint64(), 64).
+		MustStoreUInt(itemIndex, 256).
+		MustStoreRef(proofCell).
+		EndCell()
+
+	// 4. Complete the transaction
+	collectionAddrs := address.MustParseRawAddr(state.Address)
+	amount := "85000000" // Claim transaction min is 0.085 TON (https://github.com/ton-community/compressed-nft-contract/blob/de529e67971f0c888ef496cf983d681a5a13a06b/contracts/collection_new.fc#L22)
+	link := fmt.Sprintf(
+		"ton://transfer/%v?amount=%s&bin=%v",
+		collectionAddrs.String(),
+		amount,
+		base64.RawURLEncoding.EncodeToString(payload.ToBOC()),
+	)
+	fmt.Println(link)
+}