URLRequest+record.swift

extension URLRequest {
    
    static func record(_ request:URLRequest, _ response:URLResponse?, _ data:Data?, _ error:Error?) {
        #if DEBUG
            print("\n🔵 REQUEST:\n" + request.debugDescription)
            if let data = data,
                let response = String(data: data, encoding: .utf8) {
                print("\n✅ RESPONSE:\n\(response)" + "\n")
            } else {
                print("\n❌ ERROR:\n" + (error?.localizedDescription ?? "unknown error") + "\n")
            }
        #endif
    }
    
    private var debugDescription: String {
        return cURLRepresentation()
    }
    
    private func cURLRepresentation() -> String {
        guard let url = self.url else { return "$ curl command could not be created" }
        
        var components = ["curl -v"]
                
        if let httpMethod = httpMethod, httpMethod != "GET" {
            components.append("-X \(httpMethod)")
        }
        
        var headers: [AnyHashable: Any] = [:]
        
        if let headerFields = allHTTPHeaderFields {
            for (field, value) in headerFields where field != "Cookie" {
                headers[field] = value
            }
        }
        
        for (field, value) in headers {
            components.append("-H \"\(field): \(value)\"")
        }
        
        if let httpBodyData = self.httpBody, let httpBody = String(data: httpBodyData, encoding: .utf8) {
            var escapedBody = httpBody.replacingOccurrences(of: "\\\"", with: "\\\\\"")
            escapedBody = escapedBody.replacingOccurrences(of: "\"", with: "\\\"")
            components.append("-d \"\(escapedBody)\"")
        }
        
        components.append("\"\(url.absoluteString)\"")
        
        return components.joined(separator: " \\\n\t")
    }
}