let BURROW_CONTRACT = "contract.main.burrow.near"; let accountId = context.accountId; if (!accountId) { return <Widget src="ciocan.near/widget/account-signin" />; } const { selectedTokenId, amount, hasError, assets, rewards } = state; const hasData = assets.length > 0 && rewards.length > 0; const onLoad = (data) => { State.update(data); }; const shrinkToken = (value, decimals) => { return new Big(value).div(new Big(10).pow(decimals)); }; const expandToken = (value, decimals) => { return new Big(value).mul(new Big(10).pow(decimals)); }; const formatToken = (v) => Math.floor(v * 10_000) / 10_000; const account = fetch("https://rpc.mainnet.near.org", { method: "POST", headers: { "Content-Type": "application/json", }, body: JSON.stringify({ jsonrpc: "2.0", id: "dontcare", method: "query", params: { request_type: "view_account", finality: "final", account_id: accountId, }, }), }); if (!account) return <div>loading...</div>; const nearBalance = shrinkToken(account.body.result.amount, 24).toFixed(2); const toAPY = (v) => Math.round(v * 100) / 100; const listAssets = assets && assets ?.filter((a) => a.accountBalance > 0) ?.map((asset) => { const { token_id, accountBalance, metadata } = asset; const balance = formatToken( shrinkToken(accountBalance, metadata.decimals).toFixed() ).toString(); const r = rewards.find((a) => a.token_id === asset.token_id); const totalApy = r.apyBase + r.apyRewardTvl + r.apyReward; const spaces = "".padStart(15 - (metadata.symbol + balance).length, "-"); return <option value={token_id}>{metadata.symbol}</option>; }); let vailableBalance = 0; let apy = 0; const getBalance = (asset) => { if (!asset) return 0; const { token_id, accountBalance, metadata } = asset; return formatToken( shrinkToken(accountBalance, metadata.decimals).toFixed() ).toString(); }; const getApy = (asset) => { if (!asset) return 0; const r = rewards.find((a) => a.token_id === asset.token_id); const totalApy = r.apyBase + r.apyRewardTvl + r.apyReward; return toAPY(totalApy); }; if (selectedTokenId) { const token = selectedTokenId === "NEAR" ? "wrap.near" : selectedTokenId; const asset = assets.find((a) => a.token_id === token); vailableBalance = selectedTokenId === "NEAR" ? nearBalance : getBalance(asset); apy = getApy(asset); } const storageBurrow = Near.view(BURROW_CONTRACT, "storage_balance_of", { account_id: accountId, }); const storageToken = selectedTokenId ? Near.view(selectedTokenId, "storage_balance_of", { account_id: accountId, }) : null; const handleSelect = (e) => { State.update({ selectedTokenId: e.target.value, amount: "", hasError: false, }); }; const handleAmount = (e) => { State.update({ amount: Number(e.target.value), selectedTokenId, hasError: false, }); }; const handleDeposit = () => { if (!selectedTokenId || !amount || hasError) return; if (selectedTokenId === "NEAR") { handleDepositNear(amount); return; } const asset = assets.find((a) => a.token_id === selectedTokenId); const { token_id, accountBalance, metadata, config } = asset; const balance = formatToken( shrinkToken(accountBalance, metadata.decimals).toFixed() ); if (amount > balance) { State.update({ selectedTokenId, amount, hasError: true }); return; } const expandedAmount = expandToken(amount, metadata.decimals).toFixed(); const collateralAmount = expandToken( amount, metadata.decimals + config.extra_decimals ).toFixed(); const collateralMsg = config.can_use_as_collateral ? `{"Execute":{"actions":[{"IncreaseCollateral":{"token_id": "${token_id}","max_amount":"${collateralAmount}"}}]}}` : ""; const transactions = []; const depositTransaction = { contractName: token_id, methodName: "ft_transfer_call", deposit: new Big("1").toFixed(), gas: expandToken(300, 12), args: { receiver_id: BURROW_CONTRACT, amount: expandedAmount, msg: collateralMsg, }, }; if (storageToken?.available === "0" || !storageToken?.available) { transactions.push({ contractName: token_id, methodName: "storage_deposit", deposit: expandToken(0.25, 24).toFixed(), }); } if (storageBurrow?.available === "0" || !storageBurrow?.available) { transactions.push({ contractName: BURROW_CONTRACT, methodName: "storage_deposit", deposit: expandToken(0.25, 24).toFixed(), gas: expandToken(140, 12), }); } transactions.push(depositTransaction); Near.call(transactions); }; const handleDepositNear = (amount) => { const amountDecimal = expandToken(amount, 24).toFixed(); Near.call([ { contractName: "wrap.near", methodName: "near_deposit", deposit: amountDecimal, gas: expandToken(300, 12), }, { contractName: "wrap.near", methodName: "ft_transfer_call", deposit: new Big("1").toFixed(), gas: expandToken(300, 12), args: { receiver_id: BURROW_CONTRACT, amount: amountDecimal, msg: `{"Execute":{"actions":[{"IncreaseCollateral":{"token_id":"wrap.near","max_amount":"${amountDecimal}"}}]}}`, }, }, ]); }; return ( <div style={{ maxWidth: "300px" }}> {!hasData && ( <Widget src="ciocan.near/widget/burrow-data" props={{ onLoad }} /> )} <div class="card-body d-grid gap-3"> <div> <div class="mb-2 text-muted">From</div> <select onChange={handleSelect} class="p-2 mb-1" style={{ width: "100%" }} > <option value="">Deposit an asset</option> <option value="NEAR">NEAR Wallet</option> {listAssets} </select> <div> <span class="badge bg-light text-dark"> {vailableBalance} available </span> <span class="badge bg-light text-dark">{apy}% APY</span> </div> </div> <div> <div class="mb-2 text-muted">Amount</div> <input type="number" value={amount} onChange={handleAmount} /> </div> {hasError && ( <p class="alert alert-danger" role="alert"> Amount greater than balance </p> )} <button onClick={handleDeposit} style={{ background: "#4ED58A", borderColor: "white" }} > Deposit </button> </div> </div> );