commit a5e739d1d09e745314d071cd2b0e83d4a08faaac
Author: yaaarslv <yaaarslv@noreply.frostfs.info>
Date:   Thu Dec 28 13:24:32 2023 +0000

    Загрузить файлы в «/»

diff --git a/contract.go b/contract.go
new file mode 100644
index 0000000..75d9f68
--- /dev/null
+++ b/contract.go
@@ -0,0 +1,126 @@
+package smart_contract_exchange
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/go-resty/resty/v2"
+	"github.com/nspcc-dev/neo-go/pkg/interop"
+	"github.com/nspcc-dev/neo-go/pkg/interop/native/gas"
+	"github.com/nspcc-dev/neo-go/pkg/interop/native/std"
+	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
+	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+	"strconv"
+)
+
+type Wallet struct {
+	Tokens map[string]int
+}
+
+type TickerPrice struct {
+	Symbol string `json:"symbol"`
+	Price  string `json:"price"`
+}
+
+func GetWallet(address interop.Hash160) Wallet {
+	ctx := storage.GetContext()
+	walletBytes := storage.Get(ctx, address)
+	if walletBytes == nil {
+		return Wallet{
+			Tokens: make(map[string]int),
+		}
+	}
+
+	var wallet Wallet
+	walletBytesAsBytes, _ := walletBytes.([]byte)
+	err := json.Unmarshal(walletBytesAsBytes, &wallet)
+	if err != nil {
+		return Wallet{}
+	}
+
+	return wallet
+}
+
+func UpdateWallet(address interop.Hash160, wallet Wallet) {
+	ctx := storage.GetContext()
+	serialized, _ := json.Marshal(wallet)
+	storage.Put(ctx, address, serialized)
+}
+
+func GetBalance(address interop.Hash160, token string) int {
+	wallet := GetWallet(address)
+	return wallet.Tokens[token]
+}
+
+func RequestExchangeRate(fromToken string, toToken string) float64 {
+	originalString := "https://api.binance.com/api/v3/ticker/price?symbol=%sUSDT"
+
+	urlFrom := fmt.Sprintf(originalString, fromToken)
+	urlTo := fmt.Sprintf(originalString, toToken)
+
+	client := resty.New()
+
+	responseFrom, errFrom := client.R().Get(urlFrom)
+	responseTo, errTo := client.R().Get(urlTo)
+	if errFrom != nil || errTo != nil {
+		fmt.Println("Error during doing response")
+		return 0
+	}
+
+	var tickerPriceFrom TickerPrice
+	var tickerPriceTo TickerPrice
+	errFrom = json.Unmarshal(responseFrom.Body(), &tickerPriceFrom)
+	errTo = json.Unmarshal(responseTo.Body(), &tickerPriceTo)
+	if errFrom != nil || errTo != nil {
+		fmt.Println("Error during unpacking JSON")
+		return 0
+	}
+
+	priceFrom, _ := strconv.ParseFloat(tickerPriceFrom.Price, 64)
+	priceTo, _ := strconv.ParseFloat(tickerPriceTo.Price, 64)
+	result := priceFrom / priceTo
+	return result
+}
+
+func Transfer(address interop.Hash160, amount int, fromToken string, toToken string) bool {
+	if amount <= 0 {
+		runtime.Log("Invalid amount")
+		return false
+	}
+
+	balance := gas.BalanceOf(address)
+	if balance < amount {
+		runtime.Log("Low gas balance for transaction")
+		return false
+	}
+
+	contractHash := runtime.GetExecutingScriptHash()
+	result := gas.Transfer(address, contractHash, amount, nil)
+	if !result {
+		runtime.Log("Transfer operation failed")
+		return false
+	}
+
+	wallet := GetWallet(address)
+
+	if GetBalance(address, fromToken) < amount {
+		runtime.Log("Not enough funds to exchange")
+		return false
+	}
+
+	exchangeRate := RequestExchangeRate(fromToken, toToken)
+	if exchangeRate == 0 {
+		return false
+	}
+
+	convertedAmount := float64(amount) * exchangeRate
+
+	wallet.Tokens[fromToken] -= amount
+	wallet.Tokens[toToken] += int(convertedAmount)
+
+	UpdateWallet(address, wallet)
+
+	runtime.Log("Exchange successful: " + std.Itoa10(amount) + " " + fromToken +
+		" exchanged for " + std.Itoa10(int(convertedAmount)) + " " + toToken)
+
+	return true
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..ece2018
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module contracts
+
+go 1.21.5
+
+require (
+	github.com/go-resty/resty/v2 v2.11.0
+	github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231228104959-3176f72878ba
+)
+
+require golang.org/x/net v0.17.0 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..5b399e0
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,46 @@
+github.com/go-resty/resty/v2 v2.11.0 h1:i7jMfNOJYMp69lq7qozJP+bjgzfAzeOhuGlyDrqxT/8=
+github.com/go-resty/resty/v2 v2.11.0/go.mod h1:iiP/OpA0CkcL3IGt1O0+/SIItFUbkkyw5BGXiVdTu+A=
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231228104959-3176f72878ba h1:eDgYwTfBkupMnrVxs2Rmk21Cf/BG0jocYc3EvlH9np4=
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231228104959-3176f72878ba/go.mod h1:J/Mk6+nKeKSW4wygkZQFLQ6SkLOSGX5Ga0RuuuktEag=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.13.0/go.mod h1:LTmsnFJwVN6bCy1rVCoS+qHT1HhALEFxKncY3WNNh4U=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4=
+golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=