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|
import Foundation
struct CachedLookupResult<Value> {
let value: Value
let source: LookupResultSource
}
actor LookupRuntime {
static let shared = LookupRuntime()
private let ttl: TimeInterval = 300
private enum RequestKey: Hashable {
case domain(String, LookupSectionKind)
case subject(String, LookupSectionKind)
}
private enum RateLimitBucket: Hashable {
case crtsh
case rdap
case ipGeolocation
var minimumSpacing: TimeInterval {
switch self {
case .crtsh:
return 1.0
case .rdap:
return 0.75
case .ipGeolocation:
return 0.75
}
}
}
private enum CachedPayload {
case dns(ServiceResult<[DNSSection]>)
case availability(DomainAvailabilityResult)
case ssl(ServiceResult<SSLCertificateInfo>)
case hsts(Bool?)
case http(ServiceResult<HTTPHeadersResult>)
case reachability(ServiceResult<[PortReachability]>)
case ownership(ServiceResult<DomainOwnership>)
case redirect(ServiceResult<[RedirectHop]>)
case subdomains(ServiceResult<[DiscoveredSubdomain]>)
case portScan(ServiceResult<[PortScanResult]>)
case email(ServiceResult<EmailSecurityResult>)
case ptr(ServiceResult<String>)
case ipGeolocation(ServiceResult<IPGeolocation>)
case suggestions([DomainSuggestionResult])
}
private struct CacheEntry {
let payload: CachedPayload
let expiresAt: Date
}
private var cache: [RequestKey: CacheEntry] = [:]
private var inFlight: [RequestKey: Task<CachedPayload, Never>] = [:]
private var nextAllowedAt: [RateLimitBucket: Date] = [:]
func dns(domain: String) async -> CachedLookupResult<ServiceResult<[DNSSection]>> {
await execute(
key: .domain(domain, .dns),
extract: { payload in
guard case let .dns(result) = payload else { return nil }
return result
},
operation: {
.dns(await DNSLookupService.lookupAll(domain: domain))
}
)
}
func availability(domain: String) async -> CachedLookupResult<DomainAvailabilityResult> {
await execute(
key: .domain(domain, .availability),
extract: { payload in
guard case let .availability(result) = payload else { return nil }
return result
},
operation: {
.availability(await DomainAvailabilityService.check(domain: domain))
}
)
}
func ssl(domain: String) async -> CachedLookupResult<ServiceResult<SSLCertificateInfo>> {
await execute(
key: .domain(domain, .ssl),
extract: { payload in
guard case let .ssl(result) = payload else { return nil }
return result
},
operation: {
.ssl(await SSLCheckService.check(domain: domain))
}
)
}
func hsts(domain: String) async -> CachedLookupResult<Bool?> {
await execute(
key: .domain(domain, .hsts),
extract: { payload in
guard case let .hsts(result) = payload else { return nil }
return result
},
operation: {
.hsts(await SSLCheckService.checkHSTSPreload(domain: domain))
}
)
}
func http(domain: String) async -> CachedLookupResult<ServiceResult<HTTPHeadersResult>> {
await execute(
key: .domain(domain, .httpHeaders),
extract: { payload in
guard case let .http(result) = payload else { return nil }
return result
},
operation: {
.http(await HTTPHeadersService.fetch(domain: domain))
}
)
}
func reachability(domain: String) async -> CachedLookupResult<ServiceResult<[PortReachability]>> {
await execute(
key: .domain(domain, .reachability),
extract: { payload in
guard case let .reachability(result) = payload else { return nil }
return result
},
operation: {
.reachability(await ReachabilityService.checkAll(domain: domain))
}
)
}
func ownership(domain: String) async -> CachedLookupResult<ServiceResult<DomainOwnership>> {
await execute(
key: .domain(domain, .ownership),
rateLimitBucket: .rdap,
extract: { payload in
guard case let .ownership(result) = payload else { return nil }
return result
},
operation: {
.ownership(await DomainOwnershipService.lookup(domain: domain))
}
)
}
func redirectChain(domain: String) async -> CachedLookupResult<ServiceResult<[RedirectHop]>> {
await execute(
key: .domain(domain, .redirectChain),
extract: { payload in
guard case let .redirect(result) = payload else { return nil }
return result
},
operation: {
.redirect(await RedirectChainService.trace(domain: domain))
}
)
}
func subdomains(domain: String) async -> CachedLookupResult<ServiceResult<[DiscoveredSubdomain]>> {
await execute(
key: .domain(domain, .subdomains),
rateLimitBucket: .crtsh,
extract: { payload in
guard case let .subdomains(result) = payload else { return nil }
return result
},
operation: {
.subdomains(await SubdomainDiscoveryService.discover(for: domain))
}
)
}
func portScan(domain: String) async -> CachedLookupResult<ServiceResult<[PortScanResult]>> {
await execute(
key: .domain(domain, .portScan),
extract: { payload in
guard case let .portScan(result) = payload else { return nil }
return result
},
operation: {
.portScan(await PortScanService.scanAll(domain: domain))
}
)
}
func email(domain: String, txtRecords: [DNSRecord]) async -> CachedLookupResult<ServiceResult<EmailSecurityResult>> {
await execute(
key: .domain(domain, .emailSecurity),
extract: { payload in
guard case let .email(result) = payload else { return nil }
return result
},
operation: {
.email(await EmailSecurityService.analyze(domain: domain, txtRecords: txtRecords))
}
)
}
func ptr(ip: String, resolverURLString: String) async -> CachedLookupResult<ServiceResult<String>> {
await execute(
key: .subject("\(resolverURLString)|\(ip)", .ptr),
extract: { payload in
guard case let .ptr(result) = payload else { return nil }
return result
},
operation: {
.ptr(await ReverseDNSService.lookup(ip: ip, resolverURLString: resolverURLString))
}
)
}
func ipGeolocation(ip: String) async -> CachedLookupResult<ServiceResult<IPGeolocation>> {
await execute(
key: .subject(ip, .ipGeolocation),
rateLimitBucket: .ipGeolocation,
extract: { payload in
guard case let .ipGeolocation(result) = payload else { return nil }
return result
},
operation: {
.ipGeolocation(await IPGeolocationService.lookup(ip: ip))
}
)
}
func suggestions(domain: String) async -> CachedLookupResult<[DomainSuggestionResult]> {
await execute(
key: .domain(domain, .suggestions),
extract: { payload in
guard case let .suggestions(result) = payload else { return nil }
return result
},
operation: {
.suggestions(await DomainAvailabilityService.suggestions(for: domain))
}
)
}
private func execute<T>(
key: RequestKey,
rateLimitBucket: RateLimitBucket? = nil,
extract: @escaping (CachedPayload) -> T?,
operation: @escaping @Sendable () async -> CachedPayload
) async -> CachedLookupResult<T> {
if let cachedEntry = cache[key], cachedEntry.expiresAt > Date(), let value = extract(cachedEntry.payload) {
return CachedLookupResult(value: value, source: .cached)
}
if let task = inFlight[key], let value = extract(await task.value) {
return CachedLookupResult(value: value, source: .mixed)
}
let task = Task<CachedPayload, Never> {
if let rateLimitBucket {
await self.enforceRateLimit(for: rateLimitBucket)
}
return await operation()
}
inFlight[key] = task
let payload = await task.value
cache[key] = CacheEntry(payload: payload, expiresAt: Date().addingTimeInterval(ttl))
inFlight[key] = nil
guard let value = extract(payload) else {
fatalError("LookupRuntime payload extraction mismatch")
}
return CachedLookupResult(value: value, source: .live)
}
private func enforceRateLimit(for bucket: RateLimitBucket) async {
let now = Date()
if let nextAllowed = nextAllowedAt[bucket], nextAllowed > now {
let delay = nextAllowed.timeIntervalSince(now)
if delay > 0 {
try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
}
}
nextAllowedAt[bucket] = Date().addingTimeInterval(bucket.minimumSpacing)
}
}
|
