latest versions

btcphrasechecker/bitcoin/api.go

@@ -0,0 +1,161 @@
+package bitcoin
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"btcphrasechecker/types"
+)
+
+const (
+	// API base URL (using blockstream.info)
+	apiBaseURL = "https://blockstream.info/api"
+)
+
+// BlockstreamTransaction represents a transaction from Blockstream API
+type BlockstreamTransaction struct {
+	Txid   string `json:"txid"`
+	Status struct {
+		Confirmed   bool   `json:"confirmed"`
+		BlockHeight int    `json:"block_height"`
+		BlockTime   int64  `json:"block_time"`
+	} `json:"status"`
+	Vin []struct {
+		Txid    string `json:"txid"`
+		Vout    int    `json:"vout"`
+		Prevout struct {
+			Scriptpubkey        string `json:"scriptpubkey"`
+			ScriptpubkeyAddress string `json:"scriptpubkey_address"`
+			Value               uint64 `json:"value"`
+		} `json:"prevout"`
+	} `json:"vin"`
+	Vout []struct {
+		Scriptpubkey        string `json:"scriptpubkey"`
+		ScriptpubkeyAddress string `json:"scriptpubkey_address"`
+		Value               uint64 `json:"value"`
+	} `json:"vout"`
+	Fee uint64 `json:"fee"`
+}
+
+// GetAddressInfo fetches address information from Blockstream API
+func GetAddressInfo(address string) (balance, txCount uint64, received, sent uint64, err error) {
+	url := fmt.Sprintf("%s/address/%s", apiBaseURL, address)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return 0, 0, 0, 0, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return 0, 0, 0, 0, fmt.Errorf("API returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return 0, 0, 0, 0, err
+	}
+
+	var addrData struct {
+		ChainStats struct {
+			FundedTxoSum uint64 `json:"funded_txo_sum"`
+			SpentTxoSum  uint64 `json:"spent_txo_sum"`
+			TxCount      int    `json:"tx_count"`
+		} `json:"chain_stats"`
+	}
+
+	if err := json.Unmarshal(body, &addrData); err != nil {
+		return 0, 0, 0, 0, err
+	}
+
+	balance = addrData.ChainStats.FundedTxoSum - addrData.ChainStats.SpentTxoSum
+	txCount = uint64(addrData.ChainStats.TxCount)
+	received = addrData.ChainStats.FundedTxoSum
+	sent = addrData.ChainStats.SpentTxoSum
+
+	return balance, txCount, received, sent, nil
+}
+
+// GetTransactions fetches all transactions for an address
+func GetTransactions(address string) ([]types.Transaction, error) {
+	url := fmt.Sprintf("%s/address/%s/txs", apiBaseURL, address)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("API returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var bsTxs []BlockstreamTransaction
+	if err := json.Unmarshal(body, &bsTxs); err != nil {
+		return nil, err
+	}
+
+	// Convert to common transaction format
+	var transactions []types.Transaction
+	for _, bsTx := range bsTxs {
+		tx := convertTransaction(bsTx, address)
+		transactions = append(transactions, tx)
+	}
+
+	return transactions, nil
+}
+
+// convertTransaction converts Blockstream transaction to common format
+func convertTransaction(bsTx BlockstreamTransaction, forAddress string) types.Transaction {
+	tx := types.Transaction{
+		TxID:        bsTx.Txid,
+		BlockHeight: bsTx.Status.BlockHeight,
+		Confirmed:   bsTx.Status.Confirmed,
+		Fee:         bsTx.Fee,
+	}
+
+	if bsTx.Status.BlockTime > 0 {
+		tx.Time = time.Unix(bsTx.Status.BlockTime, 0)
+	}
+
+	// Calculate received and sent amounts for this address
+	var received, sent uint64
+	addressSet := make(map[string]bool)
+
+	// Check inputs (sent from address)
+	for _, vin := range bsTx.Vin {
+		if vin.Prevout.ScriptpubkeyAddress == forAddress {
+			sent += vin.Prevout.Value
+		}
+		addressSet[vin.Prevout.ScriptpubkeyAddress] = true
+	}
+
+	// Check outputs (received by address)
+	for _, vout := range bsTx.Vout {
+		if vout.ScriptpubkeyAddress == forAddress {
+			received += vout.Value
+		}
+		addressSet[vout.ScriptpubkeyAddress] = true
+	}
+
+	tx.Received = received
+	tx.Sent = sent
+	tx.NetChange = int64(received) - int64(sent)
+
+	// Collect all unique addresses
+	for addr := range addressSet {
+		if addr != "" && addr != forAddress {
+			tx.Addresses = append(tx.Addresses, addr)
+		}
+	}
+
+	return tx
+}