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ERC721 asset contract address.\n * @returns Promise resolving to whether the contract implements ERC721Metadata interface.\n */\n contractSupportsMetadataInterface = async (\n address: string,\n ): Promise => {\n return this.contractSupportsInterface(\n address,\n ERC721_METADATA_INTERFACE_ID,\n );\n };\n\n /**\n * Query if contract implements ERC721Enumerable interface.\n *\n * @param address - ERC721 asset contract address.\n * @returns Promise resolving to whether the contract implements ERC721Enumerable interface.\n */\n contractSupportsEnumerableInterface = async (\n address: string,\n ): Promise => {\n return this.contractSupportsInterface(\n address,\n ERC721_ENUMERABLE_INTERFACE_ID,\n );\n };\n\n /**\n * Query if contract implements ERC721 interface.\n *\n * @param address - ERC721 asset contract address.\n * @returns Promise resolving to whether the contract implements ERC721 interface.\n */\n contractSupportsBase721Interface = async (\n address: string,\n ): Promise => {\n return this.contractSupportsInterface(address, ERC721_INTERFACE_ID);\n };\n\n /**\n * Enumerate assets assigned to an owner.\n *\n * @param address - ERC721 asset contract address.\n * @param selectedAddress - Current account public address.\n * @param index - An NFT counter less than `balanceOf(selectedAddress)`.\n * @returns Promise resolving to token identifier for the 'index'th asset assigned to 'selectedAddress'.\n */\n getNftTokenId = async (\n address: string,\n selectedAddress: string,\n index: number,\n ): Promise => {\n const contract = new Contract(address, abiERC721, this.provider);\n return contract.tokenOfOwnerByIndex(selectedAddress, index);\n };\n\n /**\n * Query for tokenURI for a given asset.\n *\n * @param address - ERC721 asset contract address.\n * @param tokenId - ERC721 asset identifier.\n * @returns Promise resolving to the 'tokenURI'.\n */\n getTokenURI = async (address: string, tokenId: string): Promise => {\n const contract = new Contract(address, abiERC721, this.provider);\n const supportsMetadata =\n await this.contractSupportsMetadataInterface(address);\n if (!supportsMetadata) {\n // Do not throw error here, supporting Metadata interface is optional even though majority of ERC721 nfts do support it.\n // This change is made because of instances of NFTs that are ERC404( mixed ERC20 / ERC721 implementation).\n // As of today, ERC404 is unofficial but some people use it, the contract does not support Metadata interface, but it has the tokenURI() fct.\n console.warn('Contract does not support ERC721 metadata interface.');\n }\n return contract.tokenURI(tokenId);\n };\n\n /**\n * Query for name for a given asset.\n *\n * @param address - ERC721 asset contract address.\n * @returns Promise resolving to the 'name'.\n */\n getAssetName = async (address: string): Promise => {\n const contract = new Contract(address, abiERC721, this.provider);\n return contract.name();\n };\n\n /**\n * Query for symbol for a given asset.\n *\n * @param address - ERC721 asset contract address.\n * @returns Promise resolving to the 'symbol'.\n */\n getAssetSymbol = async (address: string): Promise => {\n const contract = new Contract(address, abiERC721, this.provider);\n return contract.symbol();\n };\n\n /**\n * Query for owner for a given ERC721 asset.\n *\n * @param address - ERC721 asset contract address.\n * @param tokenId - ERC721 asset identifier.\n * @returns Promise resolving to the owner address.\n */\n async getOwnerOf(address: string, tokenId: string): Promise {\n const contract = new Contract(address, abiERC721, this.provider);\n return contract.ownerOf(tokenId);\n }\n\n /**\n * Query if a contract implements an interface.\n *\n * @param address - Asset contract address.\n * @param interfaceId - Interface identifier.\n * @returns Promise resolving to whether the contract implements `interfaceID`.\n */\n private readonly contractSupportsInterface = async (\n address: string,\n interfaceId: string,\n ): Promise => {\n const contract = new Contract(address, abiERC721, this.provider);\n try {\n return await contract.supportsInterface(interfaceId);\n } catch (err) {\n // Mirror previous implementation\n if (\n err instanceof Error &&\n err.message.includes('call revert exception')\n ) {\n return false;\n }\n throw err;\n }\n };\n\n /**\n * Query if a contract implements an interface.\n *\n * @param address - Asset contract address.\n * @param ipfsGateway - The user's preferred IPFS gateway.\n * @param tokenId - tokenId of a given token in the contract.\n * @returns Promise resolving an object containing the standard, tokenURI, symbol and name of the given contract/tokenId pair.\n */\n getDetails = async (\n address: string,\n ipfsGateway: string,\n tokenId?: string,\n ): Promise<{\n standard: string;\n tokenURI: string | undefined;\n symbol: string | undefined;\n name: string | undefined;\n image: string | undefined;\n }> => {\n const isERC721 = await this.contractSupportsBase721Interface(address);\n if (!isERC721) {\n throw new Error(\"This isn't a valid ERC721 contract\");\n }\n\n const [symbol, name, tokenURI] = await Promise.all([\n safelyExecute(() => this.getAssetSymbol(address)),\n safelyExecute(() => this.getAssetName(address)),\n tokenId\n ? safelyExecute(() =>\n this.getTokenURI(address, tokenId).then((uri) =>\n uri.startsWith('ipfs://')\n ? getFormattedIpfsUrl(ipfsGateway, uri, true)\n : uri,\n ),\n )\n : undefined,\n ]);\n\n let image;\n if (tokenURI) {\n try {\n const response = await timeoutFetch(tokenURI);\n const object = await response.json();\n image = object?.image;\n if (image?.startsWith('ipfs://')) {\n image = await getFormattedIpfsUrl(ipfsGateway, image, true);\n }\n } catch {\n // ignore\n }\n }\n\n return {\n standard: ERC721,\n tokenURI,\n symbol,\n name,\n image,\n };\n };\n}\n"]}