Print NSURLRequest in cURL format

URLRequest.swift

//
//  URLRequest.swift
//
//  Created by Peter Prokop on 17/08/2017.
//  Modified by Soroush Khanlou on 09/12/2018.

import Foundation

public extension URLRequest {

    /// Returns a cURL command for a request
    /// - return A String object that contains cURL command or "" if an URL is not properly initalized.
    public var cURLRepresentation: String {

        guard
            let url = url,
            let httpMethod = httpMethod,
            url.absoluteString.count > 0
        else {
                return ""
        }

        var curlCommand = "curl --verbose \\\n"

        curlCommand.append(" '\(url.absoluteString)' \\\n")

        if httpMethod != "GET" {
            curlCommand.append(" -X \(httpMethod) \\\n")
        }

        for (key, value) in allHTTPHeaderFields?.sorted(by: { $0.key < $1.key }) ?? [] {
            curlCommand.append(" -H '\(key): \(self.value(forHTTPHeaderField: key)!)' \\\n")
        }

        if let httpBody = httpBody,
            httpBody.count > 0,
            let httpBodyString = String(data: httpBody, encoding: .utf8) {
            let escapedHttpBody = httpBodyString.replacingOccurrences(of: "'", with: "'\\''")
            curlCommand.append(" --data '\(escapedHttpBody)' \\\n")
        }

        return curlCommand
    }

}