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| 1 | +var binance_utils = {}; |
| 2 | + |
| 3 | +binance_utils.getChainVerbose = chainId => { |
| 4 | + switch (chainId) { |
| 5 | + case 'Binance-Chain-Tigris': |
| 6 | + return { name: 'Binance Chain Network', addressType: 'bbc-mainnet' }; |
| 7 | + case 'Binance-Chain-Ganges': |
| 8 | + return { name: 'Binance Chain Test Network', addressType: 'bbc-testnet' }; |
| 9 | + case '0x38': |
| 10 | + return { name: 'Binance Smart Chain Network', addressType: 'eth' }; |
| 11 | + case '0x61': |
| 12 | + return { name: 'Binance Smart Chain Test Network', addressType: 'eth' }; |
| 13 | + } |
| 14 | +} |
| 15 | + |
| 16 | + |
| 17 | +/** |
| 18 | + * Returns wallet's balance on the connected binance network |
| 19 | + * @param {String} address |
| 20 | + */ |
| 21 | +binance_utils.getAddressBalance = async address => { |
| 22 | + const isConnected = await BinanceChain.isConnected(); |
| 23 | + |
| 24 | + if (!isConnected || !address) |
| 25 | + return; |
| 26 | + |
| 27 | + data = { |
| 28 | + method: 'eth_getBalance', |
| 29 | + params: [address, 'latest'] |
| 30 | + }; |
| 31 | + |
| 32 | + const result = await BinanceChain.request(data); |
| 33 | + |
| 34 | + // convert hex balance to integer and account for decimal points |
| 35 | + const bnbBalance = BigInt(result).toString(10) * 10 ** -18; |
| 36 | + |
| 37 | + return Promise.resolve(bnbBalance.toFixed(4)); |
| 38 | +}; |
| 39 | + |
| 40 | + |
| 41 | +/** |
| 42 | + * Get accounts connected in extension |
| 43 | + */ |
| 44 | +binance_utils.getExtensionConnectedAccounts = async () => { |
| 45 | + const isConnected = await BinanceChain.isConnected(); |
| 46 | + |
| 47 | + if (!isConnected) |
| 48 | + return; |
| 49 | + |
| 50 | + const accounts = await BinanceChain.requestAccounts(); |
| 51 | + |
| 52 | + return Promise.resolve(accounts); |
| 53 | +}; |
| 54 | + |
| 55 | + |
| 56 | +/** |
| 57 | + * Sign and transfer token to another address via extension and returns txn hash |
| 58 | + * @param {Number} amount |
| 59 | + * @param {String} to_address |
| 60 | + * @param {String} from_address : optional, if not passed takes account first account from getExtensionConnectedAccounts |
| 61 | + */ |
| 62 | +binance_utils.transferViaExtension = async (amount, to_address, from_address) => { |
| 63 | + |
| 64 | + return new Promise(async(resolve, reject) => { |
| 65 | + |
| 66 | + const isConnected = await BinanceChain.isConnected(); |
| 67 | + |
| 68 | + if (!isConnected) { |
| 69 | + reject(`transferViaExtension: binance hasn't connected to the network ${binance_utils.getChainVerbose(BinanceChain.chainId).name}`); |
| 70 | + } else if (!amount) { |
| 71 | + reject('transferViaExtension: missing param amount'); |
| 72 | + } else if (!to_address) { |
| 73 | + reject('transferViaExtension: missing param to_address'); |
| 74 | + } |
| 75 | + |
| 76 | + const chainVerbose = binance_utils.getChainVerbose(BinanceChain.chainId); |
| 77 | + |
| 78 | + if (!from_address) { |
| 79 | + const accounts = await binance_utils.getExtensionConnectedAccounts(); |
| 80 | + from_address = accounts && accounts[0]['addresses'].find(address => address.type === chainVerbose.addressType).address; |
| 81 | + } |
| 82 | + |
| 83 | + if (!from_address) { |
| 84 | + reject('transferViaExtension: missing param from_address'); |
| 85 | + } |
| 86 | + |
| 87 | + const account_balance = await binance_utils.getAddressBalance(from_address); |
| 88 | + |
| 89 | + if (Number(account_balance) < amount) { |
| 90 | + reject(`transferViaExtension: insufficent balance in address ${from_address}`); |
| 91 | + } |
| 92 | + |
| 93 | + if (chainVerbose.addressType === 'eth') { |
| 94 | + const params = [ |
| 95 | + { |
| 96 | + from: from_address, |
| 97 | + to: to_address, |
| 98 | + value: '0x' + amount.toString(16) // convert amount to hex |
| 99 | + }, |
| 100 | + ]; |
| 101 | + |
| 102 | + BinanceChain |
| 103 | + .request({ |
| 104 | + method: 'eth_sendTransaction', |
| 105 | + params |
| 106 | + }) |
| 107 | + .then(txHash => { |
| 108 | + resolve(txHash); |
| 109 | + }) |
| 110 | + .catch(error => { |
| 111 | + reject('transferViaExtension: something went wrong' + error); |
| 112 | + }); |
| 113 | + } |
| 114 | + }); |
| 115 | +}; |
| 116 | + |
| 117 | + |
| 118 | +/* EVENTS */ |
| 119 | +BinanceChain.on('connect', info => { |
| 120 | + console.log(`connected to ${binance_utils.getChainVerbose(info.chainId).name}!`); |
| 121 | +}); |
| 122 | + |
| 123 | +BinanceChain.on('chainChanged', chainId => { |
| 124 | + console.log(`connected to ${binance_utils.getChainVerbose(chainId).name}!`); |
| 125 | + window.location.reload(); // reload page when chain changes |
| 126 | +}); |
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