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{\n FeatureId,\n type GenericQuoteRequest,\n} from '@metamask/bridge-controller';\nimport type { TxData } from '@metamask/bridge-controller';\nimport type { QuoteResponse } from '@metamask/bridge-controller';\nimport { toChecksumHexAddress, toHex } from '@metamask/controller-utils';\nimport { TransactionType } from '@metamask/transaction-controller';\nimport type { BatchTransaction } from '@metamask/transaction-controller';\nimport type { TransactionMeta } from '@metamask/transaction-controller';\nimport type { Hex } from '@metamask/utils';\nimport { createModuleLogger } from '@metamask/utils';\nimport { BigNumber } from 'bignumber.js';\nimport { orderBy } from 'lodash';\n\nimport type {\n BridgeFeatureFlags,\n TransactionPayBridgeQuote,\n BridgeQuoteRequest,\n} from './types';\nimport { TransactionPayStrategy } from '../..';\nimport { projectLogger } from '../../logger';\nimport type {\n FiatRates,\n FiatValue,\n PayStrategyGetBatchRequest,\n PayStrategyGetQuotesRequest,\n PayStrategyGetRefreshIntervalRequest,\n QuoteRequest,\n TransactionPayControllerMessenger,\n TransactionPayQuote,\n} from '../../types';\nimport { calculateGasCost, getGasFee } from '../../utils/gas';\nimport { getTokenFiatRate } from '../../utils/token';\n\nconst ERROR_MESSAGE_NO_QUOTES = 'No quotes found';\nconst ERROR_MESSAGE_ALL_QUOTES_UNDER_MINIMUM = 'All quotes under minimum';\nconst ATTEMPTS_MAX_DEFAULT = 5;\nconst BUFFER_INITIAL_DEFAULT = 0.04;\nconst BUFFER_STEP_DEFAULT = 0.04;\nconst BUFFER_SUBSEQUENT_DEFAULT = 0.05;\nconst SLIPPAGE_DEFAULT = 0.005;\n\nconst FEATURE_ID_BY_TRANSACTION_TYPE = new Map([\n [TransactionType.perpsDeposit, FeatureId.PERPS],\n]);\n\nconst log = createModuleLogger(projectLogger, 'bridge-strategy');\n\n/**\n * Fetch bridge quotes for multiple requests.\n *\n * @param request - Request object.\n * @returns An array of bridge quotes.\n */\nexport async function getBridgeQuotes(\n request: PayStrategyGetQuotesRequest,\n): Promise[]> {\n log('Fetching quotes', request);\n\n const { requests, messenger, transaction } = request;\n\n const finalRequests = getFinalRequests(requests, messenger);\n\n const quotes = await Promise.all(\n finalRequests.map((r, index) =>\n getSufficientSingleBridgeQuote(r, index, request),\n ),\n );\n\n return quotes.map((quote, index) =>\n normalizeQuote(quote, finalRequests[index], messenger, transaction),\n );\n}\n\n/**\n * Get bridge batch transactions if needed by the quotes.\n *\n * @param request - Request object.\n * @returns Array of batch transactions.\n */\nexport async function getBridgeBatchTransactions(\n request: PayStrategyGetBatchRequest,\n): Promise {\n const { quotes } = request;\n const firstQuote = quotes[0]?.original?.quote;\n\n if (firstQuote?.srcChainId !== firstQuote?.destChainId) {\n log('No batch transactions needed for bridge quotes');\n return [];\n }\n\n return quotes\n .map((q) => q.original)\n .flatMap((quote) => {\n const result = [];\n\n if (quote.approval) {\n result.push({\n ...getBatchTransaction(quote.approval),\n type: TransactionType.swapApproval,\n });\n }\n\n result.push({\n ...getBatchTransaction(quote.trade as TxData),\n type: TransactionType.swap,\n });\n\n return result;\n });\n}\n\n/**\n * Get the refresh interval for bridge quotes.\n *\n * @param request - Request object.\n * @returns Refresh interval in milliseconds.\n */\nexport function getBridgeRefreshInterval(\n request: PayStrategyGetRefreshIntervalRequest,\n): number | undefined {\n const { chainId, messenger } = request;\n\n const bridgeFeatureFlags = messenger.call(\n 'RemoteFeatureFlagController:getState',\n ).remoteFeatureFlags.bridgeConfigV2 as BridgeFeatureFlags | undefined;\n\n const chainInterval =\n bridgeFeatureFlags?.chains?.[parseInt(chainId, 16)]?.refreshRate;\n\n const globalInterval = bridgeFeatureFlags?.refreshRate;\n\n return chainInterval ?? globalInterval;\n}\n\n/**\n * Get a fresh quote for a previously fetched bridge quote to avoid expiration.\n *\n * 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BigNumber(currentSourceAmount).isGreaterThanOrEqualTo(\n sourceBalanceRaw,\n )\n ) {\n log('Reached balance limit', targetTokenAddress);\n break;\n }\n\n const newSourceAmount = originalSourceAmount.multipliedBy(\n 1 + buffer + bufferStep * (i + 1),\n );\n\n currentSourceAmount = newSourceAmount.isLessThan(sourceBalanceRaw)\n ? newSourceAmount.toFixed(0)\n : sourceBalanceRaw;\n }\n\n log('All attempts failed', targetTokenAddress);\n\n throw new Error(ERROR_MESSAGE_ALL_QUOTES_UNDER_MINIMUM);\n}\n\n/**\n * Fetch a single bridge quote.\n *\n * @param quoteRequest - Quote request parameters.\n * @param messenger - Controller messenger.\n * @param transaction - Transaction metadata.\n * @returns The bridge quote.\n */\nasync function getSingleBridgeQuote(\n quoteRequest: BridgeQuoteRequest,\n messenger: TransactionPayControllerMessenger,\n transaction: TransactionMeta,\n): Promise {\n const {\n from,\n slippage,\n sourceChainId,\n sourceTokenAddress,\n sourceTokenAmount,\n targetChainId,\n 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request - Original quote request.\n * @returns The best quote.\n */\nfunction getBestQuote(\n quotes: QuoteResponse[],\n request: BridgeQuoteRequest,\n): QuoteResponse {\n const fastestQuotes = orderBy(\n quotes,\n (quote) => quote.estimatedProcessingTimeInSeconds,\n 'asc',\n ).slice(0, 3);\n\n const quotesOverMinimumTarget = fastestQuotes.filter((quote) =>\n new BigNumber(quote.quote.minDestTokenAmount).isGreaterThanOrEqualTo(\n request.targetAmountMinimum,\n ),\n );\n\n log('Finding best quote', {\n allQuotes: quotes,\n fastestQuotes,\n quotesOverMinimumTarget,\n });\n\n if (!quotesOverMinimumTarget.length) {\n throw new Error(ERROR_MESSAGE_ALL_QUOTES_UNDER_MINIMUM);\n }\n\n const cheapestQuote = orderBy(\n quotesOverMinimumTarget,\n (quote) => BigNumber(quote.quote.minDestTokenAmount).toNumber(),\n 'desc',\n )[0];\n\n return cheapestQuote;\n}\n\n/**\n * Get the final bridge quote requests.\n * Subtracts subsequent source amounts from the available balance.\n *\n * @param requests - 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});\n}\n\n/**\n * Get feature flags for bridge quotes.\n *\n * @param messenger - Controller messenger.\n * @returns Feature flags.\n */\nfunction getFeatureFlags(messenger: TransactionPayControllerMessenger) {\n const featureFlags = messenger.call('RemoteFeatureFlagController:getState')\n .remoteFeatureFlags.confirmation_pay as Record | undefined;\n\n return {\n attemptsMax: featureFlags?.attemptsMax ?? ATTEMPTS_MAX_DEFAULT,\n bufferInitial: featureFlags?.bufferInitial ?? BUFFER_INITIAL_DEFAULT,\n bufferStep: featureFlags?.bufferStep ?? BUFFER_STEP_DEFAULT,\n bufferSubsequent:\n featureFlags?.bufferSubsequent ?? BUFFER_SUBSEQUENT_DEFAULT,\n slippage: featureFlags?.slippage ?? SLIPPAGE_DEFAULT,\n };\n}\n\n/**\n * Convert a bridge specific quote response to a normalized transaction pay quote.\n *\n * @param quote - Bridge quote response.\n * @param request - Request\n * @param messenger - Controller messenger.\n * @param transaction - Transaction metadata.\n * @returns Normalized transaction pay quote.\n */\nfunction normalizeQuote(\n quote: TransactionPayBridgeQuote,\n request: BridgeQuoteRequest,\n messenger: TransactionPayControllerMessenger,\n transaction: TransactionMeta,\n): TransactionPayQuote {\n const targetFiatRate = getTokenFiatRate(\n messenger,\n quote.quote.destAsset.address as Hex,\n toHex(quote.quote.destChainId),\n );\n\n const sourceFiatRate = getTokenFiatRate(\n messenger,\n quote.quote.srcAsset.address as Hex,\n toHex(quote.quote.srcChainId),\n );\n\n if (sourceFiatRate === undefined || targetFiatRate === undefined) {\n throw new Error('Fiat rate not found for source or target token');\n }\n\n const targetAmountMinimumFiat = calculateFiatValue(\n quote.quote.minDestTokenAmount,\n quote.quote.destAsset.decimals,\n targetFiatRate.fiatRate,\n targetFiatRate.usdRate,\n );\n\n const sourceAmountFiat = calculateFiatValue(\n quote.quote.srcTokenAmount,\n quote.quote.srcAsset.decimals,\n sourceFiatRate.fiatRate,\n sourceFiatRate.usdRate,\n );\n\n const targetAmountGoal = calculateFiatValue(\n request.targetAmountMinimum,\n quote.quote.destAsset.decimals,\n targetFiatRate.fiatRate,\n targetFiatRate.usdRate,\n );\n\n const targetNetwork = calculateGasCost(transaction, messenger);\n\n const sourceNetwork = calculateSourceNetworkFee(\n quote,\n sourceFiatRate,\n messenger,\n );\n\n return {\n estimatedDuration: quote.estimatedProcessingTimeInSeconds,\n dust: {\n fiat: new BigNumber(targetAmountMinimumFiat.fiat)\n .minus(targetAmountGoal.fiat)\n .toString(10),\n usd: new BigNumber(targetAmountMinimumFiat.usd)\n .minus(targetAmountGoal.usd)\n .toString(10),\n },\n fees: {\n provider: {\n fiat: new BigNumber(sourceAmountFiat.fiat)\n .minus(targetAmountMinimumFiat.fiat)\n .toString(10),\n usd: new BigNumber(sourceAmountFiat.usd)\n .minus(targetAmountMinimumFiat.usd)\n .toString(10),\n },\n sourceNetwork,\n targetNetwork,\n },\n original: quote,\n request,\n strategy: TransactionPayStrategy.Bridge,\n };\n}\n\n/**\n * Calculate fiat value from amount and fiat rates.\n *\n * @param amount - Amount to convert.\n * @param decimals - Token decimals.\n * @param fiatRateFiat - Fiat rate.\n * @param fiatRateUsd - USD rate.\n * @returns Fiat value.\n */\nfunction calculateFiatValue(\n amount: string,\n decimals: number,\n fiatRateFiat: string,\n fiatRateUsd: string,\n): FiatValue {\n const amountHuman = new BigNumber(amount).shiftedBy(-decimals);\n const usd = amountHuman.multipliedBy(fiatRateUsd).toString(10);\n const fiat = amountHuman.multipliedBy(fiatRateFiat).toString(10);\n\n return { fiat, usd };\n}\n\n/**\n * Calculate the source network fee for a bridge quote.\n *\n * @param quote - Bridge quote response.\n * @param sourceFiatRate - Fiat rate for the source token.\n * @param messenger - Controller messenger.\n * @returns Estimated gas cost for the source network.\n */\nfunction calculateSourceNetworkFee(\n quote: TransactionPayBridgeQuote,\n sourceFiatRate: FiatRates,\n messenger: TransactionPayControllerMessenger,\n): FiatValue {\n const { approval, trade } = quote;\n\n const approvalCost = approval\n ? calculateSourceGasCost(approval, sourceFiatRate, messenger)\n : { fiat: '0', usd: '0' };\n\n const tradeCost = calculateSourceGasCost(\n trade as TxData,\n sourceFiatRate,\n messenger,\n );\n\n return {\n fiat: new BigNumber(approvalCost.fiat).plus(tradeCost.fiat).toString(10),\n usd: new BigNumber(approvalCost.usd).plus(tradeCost.usd).toString(10),\n };\n}\n\n/**\n * Calculate the gas cost on the source chain for a bridge transaction.\n *\n * @param params - Transaction params.\n * @param sourceFiatRate - Fiat rate for the source token.\n * @param messenger - Controller messenger.\n * @returns Estimated gas cost for the transaction.\n */\nfunction calculateSourceGasCost(\n params: TxData,\n sourceFiatRate: FiatRates,\n messenger: TransactionPayControllerMessenger,\n): FiatValue {\n const { chainId: chainIdNumber, effectiveGas, gasLimit } = params;\n const chainId = toHex(chainIdNumber);\n\n const { estimatedBaseFee, maxFeePerGas, maxPriorityFeePerGas } = getGasFee(\n chainId,\n messenger,\n );\n\n const gas = new BigNumber(effectiveGas || gasLimit || '0x0');\n\n const feePerGas =\n estimatedBaseFee && maxPriorityFeePerGas\n ? new BigNumber(estimatedBaseFee).plus(maxPriorityFeePerGas)\n : new BigNumber(maxFeePerGas || '0x0');\n\n const gasCostNative = gas.multipliedBy(feePerGas).shiftedBy(-18);\n const usd = gasCostNative.multipliedBy(sourceFiatRate.usdRate).toString(10);\n const fiat = gasCostNative.multipliedBy(sourceFiatRate.fiatRate).toString(10);\n\n return {\n usd,\n fiat,\n };\n}\n"]}