Generates a cURL command representation of a URLRequest in Swift.

cURL+Request.swift

import Foundation

extension URLRequest {

    /**
     Returns a cURL command representation of this URL request.
     */
    public var curlString: String {
        guard let url = url else { return "" }
        var baseCommand = #"curl "\#(url.absoluteString)""#

        if httpMethod == "HEAD" {
            baseCommand += " --head"
        }

        var command = [baseCommand]

        if let method = httpMethod, method != "GET" && method != "HEAD" {
            command.append("-X \(method)")
        }

        if let headers = allHTTPHeaderFields {
            for (key, value) in headers where key != "Cookie" {
                command.append("-H '\(key): \(value)'")
            }
        }

        if let data = httpBody, let body = String(data: data, encoding: .utf8) {
            command.append("-d '\(body)'")
        }

        return command.joined(separator: " \\\n\t")
    }

}

Quick attribution: I wrote this implementation myself, but it was inspired from a few years back when I saw @dantoml implement this in a project we were working on. One of the most useful pieces of code and I use it almost every day.

Hi shaps80, can you hellp me more about curl in swift way?

Hi @shaps80

I added double quotes around url.absoluteString, otherwise the curl command in terminal doesn't work correctly (especially if there are multiple query parameters).
so the line with baseCommand looks like:

>= swift 5:
var baseCommand = #"curl "\#(url.absoluteString)""#

Older versions of swift:
var baseCommand = "curl \"\(url.absoluteString)\""

Ali

This is super helpful! Thanks.

No worries, glad you found it useful.

Thankyou this is helpful

Thankyou this is helpful

👊

Hi @shaps80

I added double quotes around url.absoluteString, otherwise the curl command in terminal doesn't work correctly (especially if there are multiple query parameters).
so the line with baseCommand looks like:

>= swift 5:
var baseCommand = #"curl "\#(url.absoluteString)""#

Older versions of swift:
var baseCommand = "curl \"\(url.absoluteString)\""

Ali

👊

You can write as

#if swift(>=5.0)
  var baseCommand = #"curl "\#(url.absoluteString)""#
#else
  var baseCommand = "curl \"\(url.absoluteString)\""
#endif

it will check the swift version at compile time

You can write as

#if swift(>=5.0)
  var baseCommand = #"curl "\#(url.absoluteString)""#
#else
  var baseCommand = "curl \"\(url.absoluteString)\""
#endif

it will check the swift version at compile time

👊

I just post a gist based on gist that is a custom LLDB command that generates a cURL command from any URLRequest in Swift. Hope find it interesting! :)

https://gist.github.com/AlvaroOlave/2ddf2b1e99d4477a51146530b7801aa0

@AlvaroOlave I love this! No need to include the code in every project! Amazing :)