POST application/x-www-form-urlencoded via swift

playground.swift

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground

XCPSetExecutionShouldContinueIndefinitely(true)

extension NSMutableURLRequest {
    
    /// Percent escape
    ///
    /// Percent escape in conformance with W3C HTML spec:
    ///
    /// See http://www.w3.org/TR/html5/forms.html#application/x-www-form-urlencoded-encoding-algorithm
    ///
    /// - parameter string:   The string to be percent escaped.
    /// - returns:            Returns percent-escaped string.
    
    private func percentEscapeString(string: String) -> String {
        let characterSet = NSCharacterSet.alphanumericCharacterSet().mutableCopy() as! NSMutableCharacterSet
        characterSet.addCharactersInString("-._* ")
        
        return string
            .stringByAddingPercentEncodingWithAllowedCharacters(characterSet)!
            .stringByReplacingOccurrencesOfString(" ", withString: "+", options: [], range: nil)
    }
    
    /// Encode the parameters for `application/x-www-form-urlencoded` request
    ///
    /// - parameter parameters:   A dictionary of string values to be encoded in POST request
    
    func encodeParameters(parameters: [String : String]) {
        HTTPMethod = "POST"
        
        let parameterArray = parameters.map { (key, value) -> String in
            return "\(key)=\(self.percentEscapeString(value))"
        }
        
        HTTPBody = parameterArray.joinWithSeparator("&").dataUsingEncoding(NSUTF8StringEncoding)
    }
}

let config = NSURLSessionConfiguration.defaultSessionConfiguration()
config.HTTPAdditionalHeaders = [
    "Accept" : "application/json",
    "Content-Type" : "application/x-www-form-urlencoded"
]

let session = NSURLSession(configuration: config)

let request = NSMutableURLRequest(URL: NSURL(string:"https://XXXXX.com/mobile-helper.jsp")!)
request.encodeParameters(["name" : "user.name@not.local", "passwd":"Passwd123"])

let task = session.dataTaskWithRequest(request) { data, response, error in
    guard error == nil && data != nil else {
        print(error)
        return
    }
    print(JSON(data:data!))
}
task.resume()

This is super-useful code. Would you mind explicitly placing it under an MIT, BSD, LGPL, or similar license?

@edw You are right ! what a workaround 👍 )

@drhr

Thanks for the answer