uniswap-interface/src/utils/getTokenList.ts at main · codeaudit/uniswap-interface · GitHub

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import { TokenList } from '@uniswap/token-lists'

import schema from '@uniswap/token-lists/src/tokenlist.schema.json'

import Ajv from 'ajv'

import contenthashToUri from './contenthashToUri'

import { parseENSAddress } from './parseENSAddress'

import uriToHttp from './uriToHttp'

const tokenListValidator = new Ajv({ allErrors: true }).compile(schema)

/**

* Contains the logic for resolving a list URL to a validated token list

* @param listUrl list url

* @param resolveENSContentHash resolves an ens name to a contenthash

export default async function getTokenList(

listUrl: string,

resolveENSContentHash: (ensName: string) => Promise<string>

): Promise<TokenList> {

const parsedENS = parseENSAddress(listUrl)

let urls: string[]

if (parsedENS) {

let contentHashUri

try {

contentHashUri = await resolveENSContentHash(parsedENS.ensName)

} catch (error) {

console.debug(`Failed to resolve ENS name: ${parsedENS.ensName}`, error)

throw new Error(`Failed to resolve ENS name: ${parsedENS.ensName}`)

}

let translatedUri

try {

translatedUri = contenthashToUri(contentHashUri)

} catch (error) {

console.debug('Failed to translate contenthash to URI', contentHashUri)

throw new Error(`Failed to translate contenthash to URI: ${contentHashUri}`)

}

urls = uriToHttp(`${translatedUri}${parsedENS.ensPath ?? ''}`)

} else {

urls = uriToHttp(listUrl)

}

for (let i = 0; i < urls.length; i++) {

const url = urls[i]

const isLast = i === urls.length - 1

let response

try {

response = await fetch(url, { credentials: 'omit' })

} catch (error) {

console.debug('Failed to fetch list', listUrl, error)

if (isLast) throw new Error(`Failed to download list ${listUrl}`)

continue

}

if (!response.ok) {

if (isLast) throw new Error(`Failed to download list ${listUrl}`)

continue

}

const json = await response.json()

if (!tokenListValidator(json)) {

const validationErrors: string =

tokenListValidator.errors?.reduce<string>((memo, error) => {

const add = `${error.dataPath} ${error.message ?? ''}`

return memo.length > 0 ? `${memo}; ${add}` : `${add}`

}, '') ?? 'unknown error'

throw new Error(`Token list failed validation: ${validationErrors}`)

}

return json

}

throw new Error('Unrecognized list URL protocol.')

}

uniswap-interface/src/utils/getTokenList.ts at main · codeaudit/uniswap-interface · GitHub

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