mirror of
https://github.com/kremalicious/metamask-extension.git
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3aaa41ef44
* replace abi-decoder with ethers * handle transaction parsing errors * update token param getter function names * add docstrings
34 lines
1.3 KiB
JavaScript
34 lines
1.3 KiB
JavaScript
import { decimalToHex } from '../../helpers/utils/conversions.util'
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import { calcTokenValue, getTokenAddressParam } from '../../helpers/utils/token-util'
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import { getTokenData } from '../../helpers/utils/transactions.util'
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export function getCustomTxParamsData (data, { customPermissionAmount, decimals }) {
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const tokenData = getTokenData(data)
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if (!tokenData) {
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throw new Error('Invalid data')
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} else if (tokenData.name !== 'approve') {
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throw new Error(`Invalid data; should be 'approve' method, but instead is '${tokenData.name}'`)
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}
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let spender = getTokenAddressParam(tokenData)
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if (spender.startsWith('0x')) {
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spender = spender.substring(2)
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}
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const [signature, tokenValue] = data.split(spender)
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if (!signature || !tokenValue) {
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throw new Error('Invalid data')
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} else if (tokenValue.length !== 64) {
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throw new Error('Invalid token value; should be exactly 64 hex digits long (u256)')
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}
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let customPermissionValue = decimalToHex(calcTokenValue(customPermissionAmount, decimals))
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if (customPermissionValue.length > 64) {
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throw new Error('Custom value is larger than u256')
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}
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customPermissionValue = customPermissionValue.padStart(tokenValue.length, '0')
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const customTxParamsData = `${signature}${spender}${customPermissionValue}`
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return customTxParamsData
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}
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