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GuardURLProtocol class to monitor all connections initiated by app
//
// GuardURLProtocol.swift
// URLProtocol
//
// Created by Bruno Philipe on 16/2/17.
// Copyright © 2017 Bruno Philipe. All rights reserved.
//
// 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
class GuardURLProtocol: URLProtocol
{
fileprivate var connection: NSURLConnection? = nil
fileprivate var _task: URLSessionTask? = nil
override var task: URLSessionTask?
{
get {
return _task
}
set {
_task = newValue
}
}
override class func canInit(with request: URLRequest) -> Bool
{
return true
}
override class func canInit(with task: URLSessionTask) -> Bool
{
return true
}
override class func canonicalRequest(for request: URLRequest) -> URLRequest
{
return request
}
override func startLoading()
{
if self.shouldBlockRequest()
{
let error = NSError(domain: "GuardURLProtocol", code: 10, userInfo: [NSLocalizedDescriptionKey: "Connection denied by guard"])
self.client?.urlProtocol(self, didFailWithError: error)
}
else if let task = self.task
{
task.resume()
}
else
{
self.connection = NSURLConnection(request: self.request, delegate: self)
}
}
override func stopLoading()
{
if let task = self.task
{
task.suspend()
}
else if let connection = self.connection
{
connection.cancel()
}
}
public func shouldBlockRequest() -> Bool
{
return false
}
}
extension GuardURLProtocol: NSURLConnectionDelegate
{
func connection(_ connection: NSURLConnection, didFailWithError error: Error)
{
self.client?.urlProtocol(self, didFailWithError: error)
}
}
extension GuardURLProtocol: NSURLConnectionDataDelegate
{
func connection(_ connection: NSURLConnection, didReceive data: Data)
{
self.client?.urlProtocol(self, didLoad: data)
}
func connection(_ connection: NSURLConnection, didReceive response: URLResponse)
{
self.client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: URLCache.StoragePolicy.allowed)
}
func connectionDidFinishLoading(_ connection: NSURLConnection)
{
self.client?.urlProtocolDidFinishLoading(self)
self.connection = nil
}
}
// Example implementation
class BlockFTPURLProtocol: GuardURLProtocol
{
override func shouldBlockRequest() -> Bool
{
return self.request.url?.scheme == "ftp"
}
}
func getURLSessionConfiguration() -> URLSessionConfiguration
{
let configuration = URLSessionConfiguration.default
configuration.protocolClasses = [
BlockFTPURLProtocol.self
]
return configuration
}
guard URLProtocol.registerClass(BlockFTPURLProtocol.self) else
{
abort()
}
let session = URLSession(configuration: getURLSessionConfiguration())
var task: URLSessionDataTask?
task = session.dataTask(with: URL(string: "ftp://www.google.com")!, completionHandler: { (data, response, error) in
if let error = error
{
NSLog("Error: \(error)")
}
else
{
NSLog("Success")
}
})
task?.resume()
let request = URLRequest(url: URL(string: "ftp://www.google.com")!)
NSURLConnection.sendAsynchronousRequest(request, queue: OperationQueue.main) { (response, data, error) in
if let error = error
{
NSLog("Error: \(error)")
}
else
{
NSLog("Success")
}
}
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