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type EthQuery from '@metamask/eth-query';\nimport { fromWei, toWei } from '@metamask/ethjs-unit';\nimport type { Hex, Json } from '@metamask/utils';\nimport {\n isStrictHexString,\n add0x,\n isHexString,\n remove0x,\n getChecksumAddress,\n isHexChecksumAddress,\n} from '@metamask/utils';\nimport type { BigNumber } from 'bignumber.js';\nimport BN from 'bn.js';\nimport ensNamehash from 'eth-ens-namehash';\nimport deepEqual from 'fast-deep-equal';\nimport { memoize } from 'lodash';\n\nimport { MAX_SAFE_CHAIN_ID } from './constants';\n\nexport type { BigNumber };\n\nconst TIMEOUT_ERROR = new Error('timeout');\n\nexport const PROTOTYPE_POLLUTION_BLOCKLIST = [\n '__proto__',\n 'constructor',\n 'prototype',\n] as const;\n\n/**\n * Checks whether a dynamic property key could be used in\n * a [prototype pollution attack](https://portswigger.net/web-security/prototype-pollution).\n *\n * @param key - The dynamic key to validate.\n * @returns Whether the given dynamic key is safe to use.\n */\nexport function isSafeDynamicKey(key: string): boolean {\n return (\n typeof key === 'string' &&\n !PROTOTYPE_POLLUTION_BLOCKLIST.some((blockedKey) => key === blockedKey)\n );\n}\n\n/**\n * Checks whether the given number primitive chain ID is safe.\n * Because some cryptographic libraries we use expect the chain ID to be a\n * number primitive, it must not exceed a certain size.\n *\n * @param chainId - The chain ID to check for safety.\n * @returns Whether the given chain ID is safe.\n */\nexport function isSafeChainId(chainId: Hex): boolean {\n if (!isHexString(chainId)) {\n return false;\n }\n const decimalChainId = Number.parseInt(\n chainId,\n isStrictHexString(chainId) ? 16 : 10,\n );\n return (\n Number.isSafeInteger(decimalChainId) &&\n decimalChainId > 0 &&\n decimalChainId <= MAX_SAFE_CHAIN_ID\n );\n}\n/**\n * Converts a BN or BigNumber object to a hex string with a '0x' prefix.\n *\n * @param inputBn - BN|BigNumber instance to convert to a hex string.\n * @returns A '0x'-prefixed hex string.\n */\n// TODO: Fix naming convention.\n// eslint-disable-next-line @typescript-eslint/naming-convention\nexport function BNToHex(inputBn: BN | BigNumber): Hex {\n return add0x(inputBn.toString(16));\n}\n\n/**\n * Used to multiply a BN by a fraction.\n *\n * @param targetBN - Number to multiply by a fraction.\n * @param numerator - Numerator of the fraction multiplier.\n * @param denominator - Denominator of the fraction multiplier.\n * @returns Product of the multiplication.\n */\nexport function fractionBN(\n targetBN: BN,\n numerator: number | string,\n denominator: number | string,\n): BN {\n const numBN = new BN(numerator);\n const denomBN = new BN(denominator);\n return targetBN.mul(numBN).div(denomBN);\n}\n\n/**\n * Used to convert a base-10 number from GWEI to WEI. Can handle numbers with decimal parts.\n *\n * @param value - The base 10 number to convert to WEI.\n * @returns The number in WEI, as a BN.\n */\nexport function gweiDecToWEIBN(value: number | string): BN {\n if (Number.isNaN(value)) {\n return new BN(0);\n }\n\n const parts = value.toString().split('.');\n const wholePart = parts[0] || '0';\n let decimalPart = parts[1] || '';\n\n if (!decimalPart) {\n return toWei(wholePart, 'gwei');\n }\n\n if (decimalPart.length <= 9) {\n return toWei(`${wholePart}.${decimalPart}`, 'gwei');\n }\n\n const decimalPartToRemove = decimalPart.slice(9);\n const decimalRoundingDigit = decimalPartToRemove[0];\n\n decimalPart = decimalPart.slice(0, 9);\n let wei = toWei(`${wholePart}.${decimalPart}`, 'gwei');\n\n if (Number(decimalRoundingDigit) >= 5) {\n wei = wei.add(new BN(1));\n }\n\n return wei;\n}\n\n/**\n * Used to convert values from wei hex format to dec gwei format.\n *\n * @param hexValue - The value in hex wei.\n * @returns The value in dec gwei as string.\n */\nexport function weiHexToGweiDec(hexValue: string): string {\n const hexWei = new BN(remove0x(hexValue), 16);\n return fromWei(hexWei, 'gwei');\n}\n\n/**\n * Return a URL that can be used to obtain ETH for a given network.\n *\n * @param networkCode - Network code of desired network.\n * @param address - Address to deposit obtained ETH.\n * @param amount - How much ETH is desired.\n * @returns URL to buy ETH based on network.\n */\nexport function getBuyURL(\n networkCode = '1',\n address?: string,\n amount = 5,\n): string | undefined {\n switch (networkCode) {\n case '1':\n return `https://buy.coinbase.com/?code=9ec56d01-7e81-5017-930c-513daa27bb6a&amount=${amount}&address=${address}&crypto_currency=ETH`;\n case '5':\n return 'https://goerli-faucet.slock.it/';\n case '11155111':\n return 'https://sepoliafaucet.net/';\n default:\n return undefined;\n }\n}\n\n/**\n * Converts a hex string to a BN object.\n *\n * @param inputHex - Number represented as a hex string.\n * @returns A BN instance.\n */\nexport function hexToBN(inputHex: string): BN {\n return inputHex ? new BN(remove0x(inputHex), 16) : new BN(0);\n}\n\n/**\n * A helper function that converts hex data to human readable string.\n *\n * @param hexValue - The hex string to convert to string.\n * @returns A human readable string conversion.\n */\nexport function hexToText(hexValue: string): string {\n try {\n const stripped = remove0x(hexValue);\n // TODO: Use `@metamask/utils` version of this function to avoid use of\n // Buffer.\n // eslint-disable-next-line no-restricted-globals\n const buff = Buffer.from(stripped, 'hex');\n return buff.toString('utf8');\n } catch {\n /* istanbul ignore next */\n return hexValue;\n }\n}\n\n/**\n * Parses a hex string and converts it into a number that can be operated on in a bignum-safe,\n * base-10 way.\n *\n * @param value - A base-16 number encoded as a string.\n * @returns The number as a BN object in base-16 mode.\n */\nexport function fromHex(value: string | BN): BN {\n if (BN.isBN(value)) {\n return value;\n }\n return new BN(hexToBN(value).toString(10));\n}\n\n/**\n * Converts an integer to a hexadecimal representation.\n *\n * @param value - An integer, an integer encoded as a base-10 string, or a BN.\n * @returns The integer encoded as a hex string.\n */\nexport function toHex(value: number | bigint | string | BN): Hex {\n if (typeof value === 'string' && isStrictHexString(value)) {\n return value;\n }\n const hexString =\n BN.isBN(value) || typeof value === 'bigint'\n ? value.toString(16)\n : new BN(value.toString(), 10).toString(16);\n return `0x${hexString}`;\n}\n\n/**\n * Execute and return an asynchronous operation without throwing errors.\n *\n * @param operation - Function returning a Promise.\n * @param logError - Determines if the error should be logged.\n * @template Result - Type of the result of the async operation\n * @returns Promise resolving to the result of the async operation.\n */\nexport async function safelyExecute(\n operation: () => Promise,\n logError = false,\n): Promise {\n try {\n return await operation();\n } catch (error) {\n /* istanbul ignore next */\n if (logError) {\n console.error(error);\n }\n return undefined;\n }\n}\n\n/**\n * Execute and return an asynchronous operation with a timeout.\n *\n * @param operation - Function returning a Promise.\n * @param logError - Determines if the error should be logged.\n * @param timeout - Timeout to fail the operation.\n * @template Result - Type of the result of the async operation\n * @returns Promise resolving to the result of the async operation.\n */\nexport async function safelyExecuteWithTimeout(\n operation: () => Promise,\n logError = false,\n timeout = 500,\n): Promise {\n try {\n return await Promise.race([\n operation(),\n new Promise((_resolve, reject) =>\n setTimeout(() => {\n reject(TIMEOUT_ERROR);\n }, timeout),\n ),\n ]);\n } catch (error) {\n /* istanbul ignore next */\n if (logError) {\n console.error(error);\n }\n return undefined;\n }\n}\n\n/**\n * Convert an address to a checksummed hexadecimal address.\n *\n * @param address - The address to convert.\n * @returns The address in 0x-prefixed hexadecimal checksummed form if it is valid.\n */\nfunction toChecksumHexAddressUnmemoized(address: string): string;\n\n/**\n * Convert an address to a checksummed hexadecimal address.\n *\n * Note that this particular overload does nothing.\n *\n * @param address - A value that is not a string (e.g. `undefined` or `null`).\n * @returns The `address` untouched.\n * @deprecated This overload is designed to gracefully handle an invalid input\n * and is only present for backward compatibility. It may be removed in a future\n * major version. Please pass a string to `toChecksumHexAddress` instead.\n */\nfunction toChecksumHexAddressUnmemoized(address: Type): Type;\n\nfunction toChecksumHexAddressUnmemoized(address: unknown): unknown {\n if (typeof address !== 'string') {\n // Mimic behavior of `addHexPrefix` from `ethereumjs-util` (which this\n // function was previously using) for backward compatibility.\n return address;\n }\n\n const hexPrefixed = add0x(address);\n\n if (!isHexString(hexPrefixed)) {\n // Version 5.1 of ethereumjs-util would have returned '0xY' for input 'y'\n // but we shouldn't waste effort trying to change case on a clearly invalid\n // string. Instead just return the hex prefixed original string which most\n // closely mimics the original behavior.\n return hexPrefixed;\n }\n\n try {\n return getChecksumAddress(hexPrefixed);\n } catch (error) {\n // This is necessary for backward compatibility with the old behavior of\n // `ethereumjs-util` which would return the original string if the address\n // was invalid.\n if (error instanceof Error && error.message === 'Invalid hex address.') {\n return hexPrefixed;\n }\n throw error;\n }\n}\n\n/**\n * Convert an address to a checksummed hexadecimal address.\n *\n * @param address - The address to convert. For backward compatibility reasons,\n * this can be anything, even a non-hex string with an 0x prefix, but that usage\n * is deprecated. Please use a valid hex string (with or without the `0x`\n * prefix).\n * @returns A 0x-prefixed checksummed version of `address` if it is a valid hex\n * string, or the address as given otherwise.\n */\nexport const toChecksumHexAddress: {\n (address: string): string;\n (address: Type): Type;\n} = memoize(toChecksumHexAddressUnmemoized);\n\nfunction isValidHexAddressUnmemoized(\n possibleAddress: string,\n { allowNonPrefixed = true } = {},\n): boolean {\n const addressToCheck = allowNonPrefixed\n ? add0x(possibleAddress)\n : possibleAddress;\n if (!isStrictHexString(addressToCheck)) {\n return false;\n }\n\n // We used to rely on `isValidAddress` from `@ethereumjs/util` which allows\n // for upper-case characters too. So we preserve this behavior and use our\n // faster and memoized validation function instead.\n return isHexChecksumAddress(addressToCheck);\n}\n\n/**\n * Validates that the input is a hex address. This utility method is a thin\n * wrapper around `isValidHexAddress` from `@metamask/utils`, with the exception\n * that it may return true for non-0x-prefixed hex strings (depending on the\n * option below).\n *\n * @param possibleAddress - Input parameter to check against.\n * @param options - The validation options.\n * @param options.allowNonPrefixed - If true will regard addresses without a\n * `0x` prefix as valid.\n * @returns Whether or not the input is a valid hex address.\n */\nexport const isValidHexAddress: (\n possibleAddress: string,\n options?: { allowNonPrefixed?: boolean },\n) => boolean = memoize(\n isValidHexAddressUnmemoized,\n (possibleAddress, { allowNonPrefixed = true } = {}) =>\n `${possibleAddress}-${allowNonPrefixed}`,\n);\n\n/**\n * Returns whether the given code corresponds to a smart contract.\n *\n * @param code - The potential smart contract code.\n * @returns Whether the code was smart contract code or not.\n */\nexport function isSmartContractCode(code: string): boolean {\n /* istanbul ignore if */\n if (!code) {\n return false;\n }\n // Geth will return '0x', and ganache-core v2.2.1 will return '0x0'\n const smartContractCode = code !== '0x' && code !== '0x0';\n return smartContractCode;\n}\n\n/**\n * An error representing a non-200 HTTP response.\n */\nexport class HttpError extends Error {\n public httpStatus: number;\n\n /**\n * Construct an HTTP error.\n *\n * @param status - The HTTP response status.\n * @param message - The error message.\n */\n constructor(status: number, message?: string) {\n super(message ?? `Fetch failed with status '${status}'`);\n this.httpStatus = status;\n }\n}\n\n/**\n * Execute fetch and verify that the response was successful.\n *\n * @param request - Request information.\n * @param options - Fetch options.\n * @returns The fetch response.\n */\nexport async function successfulFetch(\n request: URL | RequestInfo,\n options?: RequestInit,\n): Promise {\n const response = await fetch(request, options);\n if (!response.ok) {\n throw new HttpError(\n response.status,\n // TODO: Replace `String` with more specific conversion.\n // eslint-disable-next-line @typescript-eslint/no-base-to-string\n `Fetch failed with status '${response.status}' for request '${String(request)}'`,\n );\n }\n return response;\n}\n\n/**\n * Execute fetch and return object response.\n *\n * @param request - The request information.\n * @param options - The fetch options.\n * @returns The fetch response JSON data.\n */\nexport async function handleFetch(\n request: URL | RequestInfo,\n options?: RequestInit,\n // TODO: Replace `any` with more specific type.\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n): Promise {\n const response = await successfulFetch(request, options);\n const object = await response.json();\n return object;\n}\n\n/**\n * Execute fetch and return object response, log if known error thrown, otherwise rethrow error.\n *\n * @param request - the request options object\n * @param request.url - The request url to query.\n * @param request.options - The fetch options.\n * @param request.timeout - Timeout to fail request\n * @param request.errorCodesToCatch - array of error codes for errors we want to catch in a particular context\n * @returns The fetch response JSON data or undefined (if error occurs).\n */\nexport async function fetchWithErrorHandling({\n url,\n options,\n timeout,\n errorCodesToCatch,\n}: {\n url: string;\n options?: RequestInit;\n timeout?: number;\n errorCodesToCatch?: number[];\n // TODO: Replace `any` with more specific type.\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n}): Promise {\n let result;\n try {\n if (timeout) {\n result = Promise.race([\n await handleFetch(url, options),\n new Promise((_resolve, reject) =>\n setTimeout(() => {\n reject(TIMEOUT_ERROR);\n }, timeout),\n ),\n ]);\n } else {\n result = await handleFetch(url, options);\n }\n } catch (error) {\n logOrRethrowError(error, errorCodesToCatch);\n }\n return result;\n}\n\n/**\n * Fetch that fails after timeout.\n *\n * @param url - Url to fetch.\n * @param options - Options to send with the request.\n * @param timeout - Timeout to fail request.\n * @returns Promise resolving the request.\n */\nexport async function timeoutFetch(\n url: string,\n options?: RequestInit,\n timeout = 500,\n): Promise {\n return Promise.race([\n successfulFetch(url, options),\n new Promise((_resolve, reject) =>\n setTimeout(() => {\n reject(TIMEOUT_ERROR);\n }, timeout),\n ),\n ]);\n}\n\n/**\n * Normalizes the given ENS name.\n *\n * @param ensName - The ENS name.\n * @returns The normalized ENS name string.\n */\nexport function normalizeEnsName(ensName: string): string | null {\n // `.` refers to the registry root contract\n if (ensName === '.') {\n return ensName;\n }\n if (ensName && typeof ensName === 'string') {\n try {\n const normalized = ensNamehash.normalize(ensName.trim());\n // this regex is only sufficient with the above call to ensNamehash.normalize\n // TODO: change 7 in regex to 3 when shorter ENS domains are live\n if (normalized.match(/^(([\\w\\d-]+)\\.)*[\\w\\d-]{7,}\\.(eth|test)$/u)) {\n return normalized;\n }\n } catch {\n // do nothing\n }\n }\n return null;\n}\n\n/**\n * Wrapper method to handle EthQuery requests.\n *\n * @param ethQuery - EthQuery object initialized with a provider.\n * @param method - Method to request.\n * @param args - Arguments to send.\n * @returns Promise resolving the request.\n */\nexport function query(\n ethQuery: EthQuery,\n method: string,\n // TODO: Replace `any` with type\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n args: any[] = [],\n // TODO: Replace `any` with type\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n): Promise {\n return new Promise((resolve, reject) => {\n const callback = (error: unknown, result: unknown): void => {\n if (error) {\n // We don't control the error object returned by eth-query, so\n // we can't guarantee it's an instance of Error.\n // eslint-disable-next-line @typescript-eslint/prefer-promise-reject-errors\n reject(error);\n return;\n }\n resolve(result);\n };\n\n // Using `in` rather than `hasProperty` so that we look up the prototype\n // chain for the method.\n if (method in ethQuery && typeof ethQuery[method] === 'function') {\n ethQuery[method](...args, callback);\n } else {\n ethQuery.sendAsync({ method, params: args }, callback);\n }\n });\n}\n\n/**\n * Converts valid hex strings to decimal numbers, and handles unexpected arg types.\n *\n * @param value - a string that is either a hexadecimal with `0x` prefix or a decimal string.\n * @returns a decimal number.\n */\nexport const convertHexToDecimal = (\n value: string | undefined = '0x0',\n): number => {\n if (isStrictHexString(value)) {\n return parseInt(value, 16);\n }\n\n return Number(value) ? Number(value) : 0;\n};\n\ntype PlainObject = Record;\n\n/**\n * Determines whether a value is a \"plain\" object.\n *\n * @param value - A value to check\n * @returns True if the passed value is a plain object\n */\nexport function isPlainObject(value: unknown): value is PlainObject {\n return Boolean(value) && typeof value === 'object' && !Array.isArray(value);\n}\n\n/**\n * Like {@link Array}, but always non-empty.\n *\n * @template T - The non-empty array member type.\n */\nexport type NonEmptyArray = [Type, ...Type[]];\n\n/**\n * Type guard for {@link NonEmptyArray}.\n *\n * @template T - The non-empty array member type.\n * @param value - The value to check.\n * @returns Whether the value is a non-empty array.\n */\nexport function isNonEmptyArray(\n value: Type[],\n): value is NonEmptyArray {\n return Array.isArray(value) && value.length > 0;\n}\n\n/**\n * Type guard for {@link Json}.\n *\n * @param value - The value to check.\n * @returns Whether the value is valid JSON.\n */\nexport function isValidJson(value: unknown): value is Json {\n try {\n return deepEqual(value, JSON.parse(JSON.stringify(value)));\n } catch {\n return false;\n }\n}\n\n/**\n * Utility method to log if error is a common fetch error and otherwise rethrow it.\n *\n * @param error - Caught error that we should either rethrow or log to console\n * @param codesToCatch - array of error codes for errors we want to catch and log in a particular context\n */\nfunction logOrRethrowError(error: unknown, codesToCatch: number[] = []): void {\n if (!error) {\n return;\n }\n\n if (error instanceof Error) {\n const includesErrorCodeToCatch = codesToCatch.some((code) =>\n error.message.includes(`Fetch failed with status '${code}'`),\n );\n\n if (\n includesErrorCodeToCatch ||\n error.message.includes('Failed to fetch') ||\n error === TIMEOUT_ERROR\n ) {\n console.error(error);\n } else {\n throw error;\n }\n } else {\n // eslint-disable-next-line @typescript-eslint/only-throw-error\n throw error;\n }\n}\n\n/**\n * Checks if two strings are equal, ignoring case.\n *\n * @param value1 - The first string to compare.\n * @param value2 - The second string to compare.\n * @returns `true` if the strings are equal, ignoring case; otherwise, `false`.\n */\nexport function isEqualCaseInsensitive(\n value1: string,\n value2: string,\n): boolean {\n if (typeof value1 !== 'string' || typeof value2 !== 'string') {\n return false;\n }\n return value1.toLowerCase() === value2.toLowerCase();\n}\n"]}