import Foundation public enum CookieHeaderNormalizer {    private static let headerPatterns: [String] = [        #"(?i)-H\s*'Cookie:\s*([^']+)'"#,        #"(?i)-H\s*\"Cookie:\s*([^\"]+)\""#,        #"(?i)\bcookie:\s*'([^']+)'"#,        #"(?i)\bcookie:\s*\"([^\"]+)\""#,        #"(?i)\bcookie:\s*([^\r\n]+)"#,        #"(?i)(?:^|\s)(?:--cookie|-b)\s*'([^']+)'"#,        #"(?i)(?:^|\s)(?:--cookie|-b)\s*\"([^\"]+)\""#,        #"(?i)(?:^|\s)-b([^\s=]+=[^\s]+)"#,        #"(?i)(?:^|\s)(?:--cookie|-b)\s+([^\s]+)"#,    ]     public static func normalize(_ raw: String?) -> String? {        guard var value = raw?.trimmingCharacters(in: .whitespacesAndNewlines), !value.isEmpty else {            return nil        }         if let extracted = self.extractHeader(from: value) {            value = extracted        }         value = self.stripCookiePrefix(value)        value = self.stripWrappingQuotes(value)        value = value.trimmingCharacters(in: .whitespacesAndNewlines)         return value.isEmpty ? nil : value    }     public static func pairs(from raw: String) -> [(name: String, value: String)] {        guard let normalized = self.normalize(raw) else { return [] }        var results: [(name: String, value: String)] = []        results.reserveCapacity(6)         for part in normalized.split(separator: ";") {            let trimmed = part.trimmingCharacters(in: .whitespacesAndNewlines)            guard !trimmed.isEmpty,                  let equalsIndex = trimmed.firstIndex(of: "=")            else {                continue            }            let name = trimmed[..<equalsIndex].trimmingCharacters(in: .whitespacesAndNewlines)            let value = trimmed[trimmed.index(after: equalsIndex)...]                .trimmingCharacters(in: .whitespacesAndNewlines)            guard !name.isEmpty else { continue }            results.append((name: String(name), value: String(value)))        }         return results    }     public static func filteredHeader(from raw: String?, allowedNames: Set<String>) -> String? {        let filtered = self.pairs(from: raw ?? "").filter { allowedNames.contains($0.name) }        guard !filtered.isEmpty else { return nil }        return filtered.map { "\($0.name)=\($0.value)" }.joined(separator: "; ")    }     private static func extractHeader(from raw: String) -> String? {        for pattern in self.headerPatterns {            guard let regex = try? NSRegularExpression(pattern: pattern, options: []) else { continue }            let range = NSRange(raw.startIndex..<raw.endIndex, in: raw)            guard let match = regex.firstMatch(in: raw, options: [], range: range),                  match.numberOfRanges >= 2,                  let captureRange = Range(match.range(at: 1), in: raw)            else {                continue            }            let captured = raw[captureRange].trimmingCharacters(in: .whitespacesAndNewlines)            if !captured.isEmpty { return String(captured) }        }        return nil    }     private static func stripCookiePrefix(_ raw: String) -> String {        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)        guard trimmed.lowercased().hasPrefix("cookie:") else { return trimmed }        let idx = trimmed.index(trimmed.startIndex, offsetBy: "cookie:".count)        return String(trimmed[idx...]).trimmingCharacters(in: .whitespacesAndNewlines)    }     private static func stripWrappingQuotes(_ raw: String) -> String {        guard raw.count >= 2 else { return raw }        if (raw.hasPrefix("\"") && raw.hasSuffix("\"")) ||            (raw.hasPrefix("'") && raw.hasSuffix("'"))        {            return String(raw.dropFirst().dropLast())        }        return raw    }}