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Asset ERC20 contract address.\n * @param selectedAddress - Current account public address.\n * @returns Promise resolving to BN object containing balance for current account on specific asset contract.\n */\n async getBalanceOf(address: string, selectedAddress: string): Promise {\n const contract = new Contract(address, abiERC20, this.provider);\n const balance = await contract.balanceOf(selectedAddress);\n return ethersBigNumberToBN(balance);\n }\n\n /**\n * Query for the decimals for a given ERC20 asset.\n *\n * @param address - ERC20 asset contract string.\n * @returns Promise resolving to the 'decimals'.\n */\n async getTokenDecimals(address: string): Promise {\n const contract = new Contract(address, abiERC20, this.provider);\n try {\n const decimals = await contract.decimals();\n return decimals.toString();\n } catch (err) {\n // Mirror previous implementation\n if (\n err instanceof Error &&\n err.message.includes('call revert exception')\n ) {\n throw new Error('Failed to parse token decimals');\n }\n throw err;\n }\n }\n\n /**\n * Query for the name for a given ERC20 asset.\n *\n * @param address - ERC20 asset contract string.\n * @returns Promise resolving to the 'name'.\n */\n async getTokenName(address: string): Promise {\n const contract = new Contract(address, abiERC20, this.provider);\n try {\n const name = await contract.name();\n return name.toString();\n } catch (err) {\n // Mirror previous implementation\n if (\n err instanceof Error &&\n err.message.includes('call revert exception')\n ) {\n throw new Error('Failed to parse token name');\n }\n throw err;\n }\n }\n\n /**\n * Query for symbol for a given ERC20 asset.\n *\n * @param address - ERC20 asset contract address.\n * @returns Promise resolving to the 'symbol'.\n */\n async getTokenSymbol(address: string): Promise {\n // Signature for calling `symbol()`\n const payload = { to: address, data: '0x95d89b41' };\n const result = await this.provider.call(payload);\n assertIsStrictHexString(result);\n // Parse as string - treat empty string as failure\n try {\n const decoded = decodeSingle('string', result);\n if (decoded?.length > 0) {\n return decoded;\n }\n } catch {\n // Ignore error\n }\n\n // Parse as bytes - treat empty string as failure\n try {\n // Not done in bytesToUtf8 in ethereumjs/util.\n const regexPreceedingAndTrailingZeroes = /^(00)+|(00)+$/gu;\n\n const resultTrimmed = result?.replace(\n regexPreceedingAndTrailingZeroes,\n '',\n );\n\n const utf8 = bytesToUtf8(hexToBytes(resultTrimmed));\n if (utf8.length > 0) {\n return utf8;\n }\n } catch {\n // Ignore error\n }\n\n throw new Error('Failed to parse token symbol');\n }\n\n /**\n * Query if a contract implements an interface.\n *\n * @param address - Asset contract address.\n * @param userAddress - The public address for the currently active user's account.\n * @returns Promise resolving an object containing the standard, decimals, symbol and balance of the given contract/userAddress pair.\n */\n async getDetails(\n address: string,\n userAddress?: string,\n ): Promise<{\n standard: string;\n symbol: string | undefined;\n decimals: string | undefined;\n balance: BN | undefined;\n }> {\n const [decimals, symbol, balance] = await Promise.all([\n this.getTokenDecimals(address),\n this.getTokenSymbol(address),\n userAddress ? this.getBalanceOf(address, userAddress) : undefined,\n ]);\n return {\n decimals,\n symbol,\n balance,\n standard: ERC20,\n };\n }\n}\n"]}