add the tokens functionality to the common package

common/tokens.go

@@ -0,0 +1,54 @@
+package common
+
+import (
+	"context"
+	"math/big"
+	"strconv"
+)
+
+func ParseAndScaleAmount(storedAmount, activeDecimal []byte) (string, error) {
+	// Parse token decimal
+	tokenDecimal, err := strconv.Atoi(string(activeDecimal))
+	if err != nil {
+
+		return "", err
+	}
+
+	// Parse amount
+	amount, _, err := big.ParseFloat(string(storedAmount), 10, 0, big.ToZero)
+	if err != nil {
+		return "", err
+	}
+
+	// Scale the amount
+	multiplier := new(big.Float).SetInt(new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(tokenDecimal)), nil))
+	finalAmount := new(big.Float).Mul(amount, multiplier)
+
+	// Convert finalAmount to a string
+	finalAmountStr := new(big.Int)
+	finalAmount.Int(finalAmountStr)
+
+	return finalAmountStr.String(), nil
+}
+
+func ReadTransactionData(ctx context.Context, store DataStore, sessionId string) (map[DataTyp][]byte, error) {
+	dataKeys := []DataTyp{
+		DATA_TEMPORARY_VALUE,
+		DATA_ACTIVE_SYM,
+		DATA_AMOUNT,
+		DATA_PUBLIC_KEY,
+		DATA_RECIPIENT,
+		DATA_ACTIVE_DECIMAL,
+		DATA_ACTIVE_ADDRESS,
+	}
+
+	data := make(map[DataTyp][]byte)
+	for _, key := range dataKeys {
+		value, err := store.ReadEntry(ctx, sessionId, key)
+		if err != nil {
+			return nil, err
+		}
+		data[key] = value
+	}
+	return data, nil
+}