market/src/@utils/nft.ts

import {
  LoggerInstance,
  Asset,
  getHash,
  Nft,
  ProviderInstance,
  DDO,
  MetadataAndTokenURI,
  NftCreateData
} from '@oceanprotocol/lib'
import { SvgWaves } from './SvgWaves'
import Web3 from 'web3'
import { TransactionReceipt } from 'web3-core'

// https://docs.opensea.io/docs/metadata-standards
export interface NftMetadata {
  name: string
  symbol: string
  description: string
  image?: string
  /* eslint-disable camelcase */
  external_url?: string
  image_data?: string
  background_color?: string
  /* eslint-enable camelcase */
}

function encodeSvg(svgString: string): string {
  return svgString
    .replace(
      '<svg',
      ~svgString.indexOf('xmlns')
        ? '<svg'
        : '<svg xmlns="http://www.w3.org/2000/svg"'
    )
    .replace('></path>', '/>')
    .replace(/"/g, "'")
    .replace(/%/g, '%25')
    .replace(/#/g, '%23')
    .replace(/{/g, '%7B')
    .replace(/}/g, '%7D')
    .replace(/</g, '%3C')
    .replace(/>/g, '%3E')
    .replace(/\s+/g, ' ')
}

export function generateNftMetadata(): NftMetadata {
  const waves = new SvgWaves()
  const svg = waves.generateSvg()
  const imageData = `data:image/svg+xml,${encodeSvg(svg.outerHTML)}`

  const newNft: NftMetadata = {
    name: 'Ocean Data NFT',
    symbol: 'OCEAN-NFT',
    description: `This NFT represents an asset in the Ocean Protocol v4 ecosystem.`,
    external_url: 'https://market.oceanprotocol.com',
    background_color: '141414', // dark background
    image_data: imageData
  }

  return newNft
}

const tokenUriPrefix = 'data:application/json;base64,'

export function generateNftCreateData(
  nftMetadata: NftMetadata,
  accountId: string,
  transferable = true
): any {
  const nftCreateData: NftCreateData = {
    name: nftMetadata.name,
    symbol: nftMetadata.symbol,
    templateIndex: 1,
    tokenURI: '',
    transferable,
    owner: accountId
  }

  return nftCreateData
}

export function decodeTokenURI(tokenURI: string): NftMetadata {
  if (!tokenURI) return undefined

  try {
    const nftMeta = tokenURI.includes('data:application/json')
      ? (JSON.parse(
          Buffer.from(tokenURI.replace(tokenUriPrefix, ''), 'base64').toString()
        ) as NftMetadata)
      : ({ image: tokenURI } as NftMetadata)

    return nftMeta
  } catch (error) {
    LoggerInstance.error(`[NFT] ${error.message}`)
  }
}

export async function setNftMetadata(
  asset: Asset | DDO,
  accountId: string,
  web3: Web3,
  signal: AbortSignal
): Promise<TransactionReceipt> {
  const encryptedDdo = await ProviderInstance.encrypt(
    asset,
    asset.chainId,
    asset.services[0].serviceEndpoint,
    signal
  )
  LoggerInstance.log('[setNftMetadata] Got encrypted DDO', encryptedDdo)

  const metadataHash = getHash(JSON.stringify(asset))
  const nft = new Nft(web3)

  // theoretically used by aquarius or provider, not implemented yet, will remain hardcoded
  const flags = '0x2'

  const setMetadataTx = await nft.setMetadata(
    asset.nftAddress,
    accountId,
    0,
    asset.services[0].serviceEndpoint,
    '',
    flags,
    encryptedDdo,
    '0x' + metadataHash
  )

  return setMetadataTx
}

export async function setNFTMetadataAndTokenURI(
  asset: Asset | DDO,
  accountId: string,
  web3: Web3,
  nftMetadata: NftMetadata,
  signal: AbortSignal
): Promise<TransactionReceipt> {
  const encryptedDdo = await ProviderInstance.encrypt(
    asset,
    asset.chainId,
    asset.services[0].serviceEndpoint,
    signal
  )
  LoggerInstance.log(
    '[setNFTMetadataAndTokenURI] Got encrypted DDO',
    encryptedDdo
  )

  const metadataHash = getHash(JSON.stringify(asset))

  // add final did to external_url and asset link to description in nftMetadata before encoding
  const externalUrl = `${nftMetadata.external_url}/asset/${asset.id}`
  const encodedMetadata = Buffer.from(
    JSON.stringify({
      ...nftMetadata,
      description: `${nftMetadata.description}\n\nView on Ocean Market: ${externalUrl}`,
      external_url: externalUrl
    })
  ).toString('base64')
  const nft = new Nft(web3)

  // theoretically used by aquarius or provider, not implemented yet, will remain hardcoded
  const flags = '0x02'

  const metadataAndTokenURI: MetadataAndTokenURI = {
    metaDataState: 0,
    metaDataDecryptorUrl: asset.services[0].serviceEndpoint,
    metaDataDecryptorAddress: '',
    flags,
    data: encryptedDdo,
    metaDataHash: '0x' + metadataHash,
    tokenId: 1,
    tokenURI: `data:application/json;base64,${encodedMetadata}`,
    metadataProofs: []
  }

  const setMetadataAndTokenURITx = await nft.setMetadataAndTokenURI(
    asset.nftAddress,
    accountId,
    metadataAndTokenURI
  )

  return setMetadataAndTokenURITx
}