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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
#if canImport(FoundationEssentials)
import FoundationEssentials
#endif
internal import _FoundationICU
#if !FOUNDATION_FRAMEWORK
@_dynamicReplacement(for: _uidnaHook())
private func _uidnaHook_localized() -> UIDNAHook.Type? {
return UIDNAHookICU.self
}
#endif
struct UIDNAHookICU: UIDNAHook {
// `Sendable` notes: `UIDNA` from ICU is thread safe.
struct UIDNAPointer : @unchecked Sendable {
init(_ ptr: OpaquePointer?) { self.idnaTranscoder = ptr }
var idnaTranscoder: OpaquePointer?
}
private static func U_SUCCESS(_ x: Int32) -> Bool {
return x <= U_ZERO_ERROR.rawValue
}
private static let idnaTranscoder: UIDNAPointer? = {
var status = U_ZERO_ERROR
let options = UInt32(
UIDNA_CHECK_BIDI |
UIDNA_CHECK_CONTEXTJ |
UIDNA_NONTRANSITIONAL_TO_UNICODE |
UIDNA_NONTRANSITIONAL_TO_ASCII
)
let encoder = uidna_openUTS46(options, &status)
guard U_SUCCESS(status.rawValue) else {
return nil
}
return UIDNAPointer(encoder)
}()
private static func shouldAllow(_ errors: UInt32, encodeToASCII: Bool) -> Bool {
let allowedErrors: UInt32
if encodeToASCII {
allowedErrors = 0
} else {
allowedErrors = UInt32(
UIDNA_ERROR_EMPTY_LABEL |
UIDNA_ERROR_LABEL_TOO_LONG |
UIDNA_ERROR_DOMAIN_NAME_TOO_LONG |
UIDNA_ERROR_LEADING_HYPHEN |
UIDNA_ERROR_TRAILING_HYPHEN |
UIDNA_ERROR_HYPHEN_3_4
)
}
return errors & ~allowedErrors == 0
}
/// Type of `uidna_nameToASCII` and `uidna_nameToUnicode` functions
private typealias TranscodingFunction<T> = (OpaquePointer?, UnsafePointer<T>?, Int32, UnsafeMutablePointer<T>?, Int32, UnsafeMutablePointer<UIDNAInfo>?, UnsafeMutablePointer<UErrorCode>?) -> Int32
private static func IDNACodedHost<T: FixedWidthInteger>(
hostBuffer: UnsafeBufferPointer<T>,
transcode: TranscodingFunction<T>,
allowErrors: (UInt32) -> Bool,
createString: (UnsafeMutablePointer<T>, Int) -> String?
) -> String? {
let maxHostBufferLength = 2048
if hostBuffer.count > maxHostBufferLength {
return nil
}
guard let transcoder = idnaTranscoder else {
return nil
}
let result: String? = withUnsafeTemporaryAllocation(of: T.self, capacity: maxHostBufferLength) { outBuffer in
var processingDetails = UIDNAInfo(
size: Int16(MemoryLayout<UIDNAInfo>.size),
isTransitionalDifferent: 0,
reservedB3: 0,
errors: 0,
reservedI2: 0,
reservedI3: 0
)
var error = U_ZERO_ERROR
let hostBufferPtr = hostBuffer.baseAddress!
let outBufferPtr = outBuffer.baseAddress!
let charsConverted = transcode(
transcoder.idnaTranscoder,
hostBufferPtr,
Int32(hostBuffer.count),
outBufferPtr,
Int32(outBuffer.count),
&processingDetails,
&error
)
if U_SUCCESS(error.rawValue), allowErrors(processingDetails.errors), charsConverted > 0 {
return createString(outBufferPtr, Int(charsConverted))
}
return nil
}
return result
}
private static func IDNACodedHostUTF8(_ utf8Buffer: UnsafeBufferPointer<UInt8>, encodeToASCII: Bool) -> String? {
var transcode = uidna_nameToUnicodeUTF8
if encodeToASCII {
transcode = uidna_nameToASCII_UTF8
}
return utf8Buffer.withMemoryRebound(to: CChar.self) { charBuffer in
return IDNACodedHost(
hostBuffer: charBuffer,
transcode: transcode,
allowErrors: { errors in
shouldAllow(errors, encodeToASCII: encodeToASCII)
},
createString: { ptr, count in
let outBuffer = UnsafeBufferPointer(start: ptr, count: count).withMemoryRebound(to: UInt8.self) { $0 }
var hostsAreEqual = false
if outBuffer.count == utf8Buffer.count {
hostsAreEqual = true
for i in 0..<outBuffer.count {
if utf8Buffer[i] == outBuffer[i] {
continue
}
guard utf8Buffer[i]._lowercased == outBuffer[i] else {
hostsAreEqual = false
break
}
}
}
if hostsAreEqual {
return String._tryFromUTF8(utf8Buffer)
} else {
return String._tryFromUTF8(outBuffer)
}
}
)
}
}
private static func IDNACodedHostUTF16(_ utf16Buffer: UnsafeBufferPointer<UInt16>, encodeToASCII: Bool) -> String? {
var transcode = uidna_nameToUnicode
if encodeToASCII {
transcode = uidna_nameToASCII
}
return IDNACodedHost(
hostBuffer: utf16Buffer,
transcode: transcode,
allowErrors: { errors in
shouldAllow(errors, encodeToASCII: encodeToASCII)
},
createString: { ptr, count in
let outBuffer = UnsafeBufferPointer(start: ptr, count: count)
var hostsAreEqual = false
if outBuffer.count == utf16Buffer.count {
hostsAreEqual = true
for i in 0..<outBuffer.count {
if utf16Buffer[i] == outBuffer[i] {
continue
}
guard utf16Buffer[i] < 128,
UInt8(utf16Buffer[i])._lowercased == outBuffer[i] else {
hostsAreEqual = false
break
}
}
}
if hostsAreEqual {
return String(_utf16: utf16Buffer)
} else {
return String(_utf16: outBuffer)
}
}
)
}
private static func IDNACodedHost(_ host: some StringProtocol, encodeToASCII: Bool) -> String? {
let fastResult = host.utf8.withContiguousStorageIfAvailable {
IDNACodedHostUTF8($0, encodeToASCII: encodeToASCII)
}
if let fastResult {
return fastResult
}
#if FOUNDATION_FRAMEWORK
if let fastCharacters = host._ns._fastCharacterContents() {
let charsBuffer = UnsafeBufferPointer(start: fastCharacters, count: host._ns.length)
return IDNACodedHostUTF16(charsBuffer, encodeToASCII: encodeToASCII)
}
#endif
var hostString = String(host)
return hostString.withUTF8 {
IDNACodedHostUTF8($0, encodeToASCII: encodeToASCII)
}
}
static func encode(_ host: some StringProtocol) -> String? {
return IDNACodedHost(host, encodeToASCII: true)
}
static func decode(_ host: some StringProtocol) -> String? {
return IDNACodedHost(host, encodeToASCII: false)
}
}
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