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perf: better string operations on fake domain check #118

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perf: better string operations on fake domain check #118

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9 changes: 5 additions & 4 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,11 +21,12 @@ function hostnameFromEmailAddress(email) {

function isFakeDomain(domain, json = false) {
if (!json) json = static_json_v1
for (let dom of Object.keys(json.domains)) {
// exact match
if (dom === domain.toLowerCase().trim()) return dom
const normalizedDomain = domain.toLowerCase().trim()
// exact match
if (json.domains[normalizedDomain]) return normalizedDomain
for (const dom in json.domains) {
// subdomain match
if (domain.search(new RegExp(`.+\\.${dom}`)) === 0) return dom
if (new RegExp(`${dom}$`).test(normalizedDomain)) return dom
}
return false
}
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