youtube api for playground (Swift 4)

youtube_api.playground

import UIKit

let youtubeURLs: [String] = [
    "https://www.youtube.com/get_video_info?video_id=e0okrDbEsXM",
    "https://www.youtube.com/get_video_info?video_id=Dwh9hpBWtYQ",
    "https://www.youtube.com/get_video_info?video_id=aNyNLEoPx4k"//,
//    "https://www.youtube.com/get_video_info?video_id=mM5_T-F1Yn4",
//    "https://www.youtube.com/get_video_info?video_id=XYra2ovcWxE"
]

let semaphore = DispatchSemaphore(value: 0)

func getURL(_ url: String, completion: @escaping (_ url: String) -> Void) {
    var req = URLRequest(url: URL(string: url)!)
    req.httpMethod = "GET"
    let task = URLSession.shared.dataTask(with: req, completionHandler: { data, response, error in
        print(error ?? "")
        guard let data = data, let result = String(data: data, encoding: .utf8) else { return }

        var parameters: [String : String] = [:]
        var par: [[String : String]] = []
        // 動画URL抽出
        for keyValue in result.split(separator: "&") {
            let keyValueArray = keyValue.split(separator: "=")
            guard let key = keyValueArray.first, let value = keyValueArray.last?.removingPercentEncoding else { continue }
            if key == "url_encoded_fmt_stream_map" {
                for child in value.split(separator: ",") {
                    var parameters2: [String : String] = [:]
                    for item in child.split(separator: "&") {
                        let keyValueArray2 = item.split(separator: "=")
                        guard let key2 = keyValueArray2.first, let value2 = keyValueArray2.last?.removingPercentEncoding else { continue }
                        parameters2[String(key2)] = value2
                    }
                    par.append(parameters2)
                }
            }
            parameters[String(key)] = value
        }
        // 画質良いurlを返す
        guard let dic = par.first(where: { $0["quality"] == "hd720" }), let url = dic["url"] else { return }
//        print(url)
        completion(url)
        semaphore.signal()
    })
    task.resume()
    semaphore.wait()
}

for url in youtubeURLs {
    getURL(url) { urlString in
        print(urlString)
    }
}