Parameter Encoding

ParameterEncoding.swift

//
//  ParameterEncoding.swift
//
//  Copyright (c) 2014-2016 Alamofire Software Foundation (http://alamofire.org/)
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

extension String {
    func queryStringByAddingPercentEncoding() -> String {
        return self.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
    }
}

let testString = "<>%#"

testString.queryStringByAddingPercentEncoding()

func encode(paramaters: [String: AnyObject]) -> String {
    var components = [(String, String)]()
    
    let sortedKeys = paramaters.keys.sort(<)
    
    for key in sortedKeys {
        let value = paramaters[key]!
        components.appendContentsOf(queryComponents(key, value: value))
    }
    
    let encodedComponents = components.map { "\($0)=\($1)" } as [String]
    return encodedComponents.joinWithSeparator("&")
}

func queryComponents(key: String, value: AnyObject) -> [(String, String)] {
    var components = [(String, String)]()
    
    if let dictionary = value as? [String: AnyObject] {
        for (nestedKey, value) in dictionary {
            let nestedComponents = queryComponents("\(key)[\(nestedKey)]", value: value)
            components.appendContentsOf(nestedComponents)
        }
    } else if let array = value as? [AnyObject] {
        for value in array {
            let nestedComponents = queryComponents("\(key)[]", value: value)
            components.appendContentsOf(nestedComponents)
        }
    } else {
        let encodedKey = key.queryStringByAddingPercentEncoding()
        let encodedValue = "\(value)".queryStringByAddingPercentEncoding()
        
        let component = (encodedKey, encodedValue)
        components.append(component)
    }
    
    return components
}

let parameters = ["foo": ["bar": 1]]
encode(parameters)