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Diffstat (limited to 'ui/app/components/send_/send.utils.js')
-rw-r--r-- | ui/app/components/send_/send.utils.js | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/ui/app/components/send_/send.utils.js b/ui/app/components/send_/send.utils.js new file mode 100644 index 000000000..f09a02a6a --- /dev/null +++ b/ui/app/components/send_/send.utils.js @@ -0,0 +1,188 @@ +const { + addCurrencies, + conversionUtil, + conversionGTE, + multiplyCurrencies, + conversionGreaterThan, +} = require('../../conversion-util') +const { + calcTokenAmount, +} = require('../../token-util') +const { + INSUFFICIENT_FUNDS_ERROR, + INSUFFICIENT_TOKENS_ERROR, + NEGATIVE_ETH_ERROR, +} = require('./send.constants') +const abi = require('ethereumjs-abi') + +module.exports = { + calcGasTotal, + doesAmountErrorRequireUpdate, + generateTokenTransferData, + getAmountErrorObject, + getParamsForGasEstimate, + calcTokenBalance, + isBalanceSufficient, + isTokenBalanceSufficient, +} + +function calcGasTotal (gasLimit, gasPrice) { + return multiplyCurrencies(gasLimit, gasPrice, { + toNumericBase: 'hex', + multiplicandBase: 16, + multiplierBase: 16, + }) +} + +function isBalanceSufficient ({ + amount = '0x0', + amountConversionRate, + balance, + conversionRate, + gasTotal = '0x0', + primaryCurrency, +}) { + const totalAmount = addCurrencies(amount, gasTotal, { + aBase: 16, + bBase: 16, + toNumericBase: 'hex', + }) + + const balanceIsSufficient = conversionGTE( + { + value: balance, + fromNumericBase: 'hex', + fromCurrency: primaryCurrency, + conversionRate, + }, + { + value: totalAmount, + fromNumericBase: 'hex', + conversionRate: amountConversionRate || conversionRate, + fromCurrency: primaryCurrency, + }, + ) + + return balanceIsSufficient +} + +function isTokenBalanceSufficient ({ + amount = '0x0', + tokenBalance, + decimals, +}) { + const amountInDec = conversionUtil(amount, { + fromNumericBase: 'hex', + }) + + const tokenBalanceIsSufficient = conversionGTE( + { + value: tokenBalance, + fromNumericBase: 'dec', + }, + { + value: calcTokenAmount(amountInDec, decimals), + fromNumericBase: 'dec', + }, + ) + + return tokenBalanceIsSufficient +} + +function getAmountErrorObject ({ + amount, + amountConversionRate, + balance, + conversionRate, + gasTotal, + primaryCurrency, + selectedToken, + tokenBalance, +}) { + let insufficientFunds = false + if (gasTotal && conversionRate) { + insufficientFunds = !isBalanceSufficient({ + amount: selectedToken ? '0x0' : amount, + amountConversionRate, + balance, + conversionRate, + gasTotal, + primaryCurrency, + }) + } + + let inSufficientTokens = false + if (selectedToken && tokenBalance !== null) { + const { decimals } = selectedToken + inSufficientTokens = !isTokenBalanceSufficient({ + tokenBalance, + amount, + decimals, + }) + } + + const amountLessThanZero = conversionGreaterThan( + { value: 0, fromNumericBase: 'dec' }, + { value: amount, fromNumericBase: 'hex' }, + ) + + let amountError = null + + if (insufficientFunds) { + amountError = INSUFFICIENT_FUNDS_ERROR + } else if (inSufficientTokens) { + amountError = INSUFFICIENT_TOKENS_ERROR + } else if (amountLessThanZero) { + amountError = NEGATIVE_ETH_ERROR + } + + return { amount: amountError } +} + +function getParamsForGasEstimate (selectedAddress, symbol, data) { + const estimatedGasParams = { + from: selectedAddress, + gas: '746a528800', + } + + if (symbol) { + Object.assign(estimatedGasParams, { value: '0x0' }) + } + + if (data) { + Object.assign(estimatedGasParams, { data }) + } + + return estimatedGasParams +} + +function calcTokenBalance ({ selectedToken, usersToken }) { + const { decimals } = selectedToken || {} + return calcTokenAmount(usersToken.balance.toString(), decimals) +} + +function doesAmountErrorRequireUpdate ({ + balance, + gasTotal, + prevBalance, + prevGasTotal, + prevTokenBalance, + selectedToken, + tokenBalance, +}) { + const balanceHasChanged = balance !== prevBalance + const gasTotalHasChange = gasTotal !== prevGasTotal + const tokenBalanceHasChanged = selectedToken && tokenBalance !== prevTokenBalance + const amountErrorRequiresUpdate = balanceHasChanged || gasTotalHasChange || tokenBalanceHasChanged + + return amountErrorRequiresUpdate +} + +function generateTokenTransferData (selectedAddress, selectedToken) { + if (!selectedToken) return + console.log(`abi.rawEncode`, abi.rawEncode) + return Array.prototype.map.call( + abi.rawEncode(['address', 'uint256'], [selectedAddress, '0x0']), + x => ('00' + x.toString(16)).slice(-2) + ).join('') +} |