mirror of
https://github.com/kremalicious/metamask-extension.git
synced 2024-10-22 19:26:13 +02:00
98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
const ObservableStore = require('obs-store')
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const { warn } = require('loglevel')
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const contracts = require('eth-contract-metadata')
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const {
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ROPSTEN,
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RINKEBY,
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KOVAN,
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MAINNET,
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OCALHOST,
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} = require('./network/enums')
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// By default, poll every 3 minutes
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const DEFAULT_INTERVAL = 180 * 1000
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/**
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* A controller that polls for token exchange
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* rates based on a user's current token list
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*/
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class DetectTokensController {
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/**
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* Creates a DetectTokensController
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*
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* @param {Object} [config] - Options to configure controller
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*/
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constructor ({ interval = DEFAULT_INTERVAL, preferences, network } = {}) {
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this.preferences = preferences
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this.interval = interval
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this.network = network
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}
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/**
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* For each token in eth-contract=metada, find check selectedAddress balance.
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*
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*/
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async exploreNewTokens () {
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if (!this.isActive) { return }
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if (this._network.getProviderConfig().type !== MAINNET) { return }
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var tokens = this._preferences.store.getState().tokens
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let detectedTokenAddress, token
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for (const address in contracts) {
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const contract = contracts[address]
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if (contract.erc20 && !(address in tokens)) {
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detectedTokenAddress = await this.fetchContractAccountBalance(address)
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if (detectedTokenAddress) {
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token = contracts[detectedTokenAddress]
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this._preferences.addToken(detectedTokenAddress, token['symbol'], token['decimals'])
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}
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}
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// etherscan restriction, 5 request/second, lazy scan
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setTimeout(() => {}, 200)
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}
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}
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/**
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* Find if selectedAddress has tokens with contract in contractAddress.
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*
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* @param {string} contractAddress Hex address of the token contract to explore.
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* @returns {string} Contract address to be added to tokens.
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*
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*/
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async fetchContractAccountBalance (contractAddress) {
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const address = this._preferences.store.getState().selectedAddress
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const response = await fetch(`https://api.etherscan.io/api?module=account&action=tokenbalance&contractaddress=${contractAddress}&address=${address}&tag=latest&apikey=NCKS6GTY41KPHWRJB62ES1MDNRBIT174PV`)
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const parsedResponse = await response.json()
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if (parsedResponse.result !== '0') {
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return contractAddress
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}
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return null
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}
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/**
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* @type {Number}
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*/
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set interval (interval) {
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this._handle && clearInterval(this._handle)
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if (!interval) { return }
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this._handle = setInterval(() => { this.exploreNewTokens() }, interval)
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}
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/**
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* @type {Object}
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*/
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set preferences (preferences) {
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if (!preferences) { return }
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this._preferences = preferences
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}
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/**
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* @type {Object}
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*/
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set network (network) {
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if (!network) { return }
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this._network = network
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}
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}
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module.exports = DetectTokensController
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