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PluginDownloader.swift
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//
// PluginDownloader.swift
// XcodeHelper
//
// Created by dhcdht on 2016/10/18.
// Copyright © 2016年 DXStudio All rights reserved.
//
import Cocoa
typealias PluginDownloaderJsonDownloadCompletion = (Dictionary<String, AnyObject>?, Error?) -> Void
typealias PluginDownloaderDataDownloadCompletion = (Data?, Error?) -> Void
typealias PluginDownloaderDownloadProgress = (Float) -> Void
private let kDefaultRepoURL = "https://raw.github.com/alcatraz/alcatraz-packages/master/packages.json";
private let kCompletionBlockKey = "kCompletionBlockKey"
private let kProgressBlockKey = "kProgressBlockKey"
class PluginDownloader: NSObject, URLSessionDownloadDelegate {
private var callbacks = Dictionary<URLSessionTask, Dictionary<String, Any>>()
func downloadPluginPackageList(completion: PluginDownloaderJsonDownloadCompletion?) -> Void {
self.downloadFile(path: kDefaultRepoURL, progressBlock: nil) { (data, error) in
if let error = error {
completion?(nil, error)
return
}
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? Dictionary<String, Dictionary<String, AnyObject>>
completion?(json?["packages"], nil)
} catch {
// TODO:
}
}
}
}
func downloadFile(path: String, progressBlock: PluginDownloaderDownloadProgress?, completion: PluginDownloaderDataDownloadCompletion?) -> Void {
guard let url = URL(string: path) else {
completion?(nil, nil)
return
}
let urlsession = URLSession(configuration: URLSessionConfiguration.default, delegate: self, delegateQueue: OperationQueue.main)
let task = urlsession.downloadTask(with: url)
var callbacks = Dictionary<String, Any>(minimumCapacity: 2)
if let progressBlock = progressBlock {
callbacks[kProgressBlockKey] = progressBlock
}
if let completion = completion {
callbacks[kCompletionBlockKey] = completion
}
self.callbacks[task] = callbacks
task.resume()
}
// MARK: URLSessionDownloadDelegate
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
let completion = self.callbacks[downloadTask]?[kCompletionBlockKey] as? PluginDownloaderDataDownloadCompletion
if let completion = completion {
do {
let data = try Data(contentsOf: location)
completion(data, nil)
} catch {
// TODO:
}
}
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
let progress = Float(totalBytesWritten) / Float(totalBytesExpectedToWrite)
let progressBlock = self.callbacks[downloadTask]?[kProgressBlockKey] as? PluginDownloaderDownloadProgress
if let progressBlock = progressBlock {
progressBlock(progress)
}
}
}