mirror of
https://github.com/kremalicious/metamask-extension.git
synced 2024-12-23 09:52:26 +01:00
42 lines
1.6 KiB
JavaScript
42 lines
1.6 KiB
JavaScript
const levenshtein = require('fast-levenshtein')
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const blacklistedMetaMaskDomains = ['metamask.com']
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const blacklistedDomains = require('etheraddresslookup/blacklists/domains.json').concat(blacklistedMetaMaskDomains)
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const whitelistedMetaMaskDomains = ['metamask.io', 'www.metamask.io']
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const whitelistedDomains = require('etheraddresslookup/whitelists/domains.json').concat(whitelistedMetaMaskDomains)
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const LEVENSHTEIN_TOLERANCE = 4
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const LEVENSHTEIN_CHECKS = ['myetherwallet', 'myetheroll', 'ledgerwallet', 'metamask']
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// credit to @sogoiii and @409H for their help!
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// Return a boolean on whether or not a phish is detected.
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function isPhish(hostname) {
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var strCurrentTab = hostname
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// check if the domain is part of the whitelist.
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if (whitelistedDomains && whitelistedDomains.includes(strCurrentTab)) { return false }
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// check if the domain is part of the blacklist.
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var isBlacklisted = blacklistedDomains && blacklistedDomains.includes(strCurrentTab)
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// check for similar values.
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var levenshteinMatched = false
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var levenshteinForm = strCurrentTab.replace(/\./g, '')
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LEVENSHTEIN_CHECKS.forEach((element) => {
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if (levenshtein.get(element, levenshteinForm) < LEVENSHTEIN_TOLERANCE) {
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levenshteinMatched = true
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}
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})
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return isBlacklisted || levenshteinMatched
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}
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window.addEventListener('load', function () {
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var hostnameToCheck = window.location.hostname
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if (isPhish(hostnameToCheck)) {
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// redirect to our phishing warning page.
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window.location.href = 'https://metamask.io/phishing.html'
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}
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})
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module.exports = isPhish
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