extension to print an NSURLRequest as a curl command (ready to be copy and pasted onto terminal, etc)

URLRequest + CurlCommand.swift

extension URLRequest {
    /// Internal helper function to escape double quotes
    func curlEscapeQuotes(in string: String) -> String {
        return string.replacingOccurrences(of: "\"", with: "\\\"")
    }

    /// Curl Command string
    var curlCommand: String {
        guard let url = url else {
            return "# No URL found"
        }
        var curlString = "curl -k -X \(httpMethod ?? "NULL") --dump-header -"
        for header in (allHTTPHeaderFields ?? [:]) {
            let headerKey = curlEscapeQuotes(in: header.key)
            let headerValue = curlEscapeQuotes(in: header.value)
            curlString += " -H \"\(headerKey): \(headerValue)\""
        }
        if let httpBody = httpBody,
            let bodyDataString = String(data: httpBody, encoding: .utf8),
            !bodyDataString.isEmpty {
            curlString += " -d \"\(bodyDataString)\""
        }
        curlString += " \"\(url.absoluteString)\""
        return curlString;
    }
}