114 lines
4.0 KiB
Plaintext
114 lines
4.0 KiB
Plaintext
// This file Copyright © Transmission authors and contributors.
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// It may be used under the MIT (SPDX: MIT) license.
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// License text can be found in the licenses/ folder.
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#import "PortChecker.h"
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static NSTimeInterval const kCheckFireInterval = 3.0;
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@interface PortChecker ()
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@property(nonatomic, weak) NSObject<PortCheckerDelegate>* fDelegate;
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@property(nonatomic) PortStatus fStatus;
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@property(nonatomic) NSURLSession* fSession;
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@property(nonatomic) NSURLSessionDataTask* fTask;
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@property(nonatomic) NSTimer* fTimer;
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@end
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@implementation PortChecker
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- (instancetype)initForPort:(NSInteger)portNumber delay:(BOOL)delay withDelegate:(NSObject<PortCheckerDelegate>*)delegate
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{
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if ((self = [super init]))
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{
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_fSession = [NSURLSession sessionWithConfiguration:NSURLSessionConfiguration.ephemeralSessionConfiguration delegate:nil
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delegateQueue:nil];
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_fDelegate = delegate;
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_fStatus = PortStatusChecking;
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_fTimer = [NSTimer scheduledTimerWithTimeInterval:kCheckFireInterval target:self selector:@selector(startProbe:)
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userInfo:@(portNumber)
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repeats:NO];
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if (!delay)
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{
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[_fTimer fire];
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}
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}
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return self;
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}
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- (void)dealloc
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{
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[self cancelProbe];
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}
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- (PortStatus)status
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{
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return self.fStatus;
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}
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- (void)cancelProbe
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{
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[self.fTimer invalidate];
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self.fTimer = nil;
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[self.fTask cancel];
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}
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#pragma mark - Private
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- (void)startProbe:(NSTimer*)timer
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{
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self.fTimer = nil;
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NSString* urlString = [NSString stringWithFormat:@"https://portcheck.transmissionbt.com/%ld", [(NSNumber*)timer.userInfo integerValue]];
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NSURLRequest* portProbeRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]
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cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
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timeoutInterval:15.0];
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_fTask = [_fSession dataTaskWithRequest:portProbeRequest
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completionHandler:^(NSData* _Nullable data, NSURLResponse* _Nullable response, NSError* _Nullable error) {
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if (error)
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{
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NSLog(@"Unable to get port status: connection failed (%@)", error.localizedDescription);
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[self callBackWithStatus:PortStatusError];
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return;
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}
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NSString* probeString = [[NSString alloc] initWithData:data ?: NSData.data encoding:NSUTF8StringEncoding];
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if (!probeString)
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{
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NSLog(@"Unable to get port status: invalid data received");
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[self callBackWithStatus:PortStatusError];
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}
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else if ([probeString isEqualToString:@"1"])
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{
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[self callBackWithStatus:PortStatusOpen];
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}
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else if ([probeString isEqualToString:@"0"])
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{
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[self callBackWithStatus:PortStatusClosed];
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}
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else
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{
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NSLog(@"Unable to get port status: invalid response (%@)", probeString);
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[self callBackWithStatus:PortStatusError];
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}
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}];
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[_fTask resume];
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}
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- (void)callBackWithStatus:(PortStatus)status
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{
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self.fStatus = status;
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NSObject<PortCheckerDelegate>* delegate = self.fDelegate;
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[delegate performSelectorOnMainThread:@selector(portCheckerDidFinishProbing:) withObject:self waitUntilDone:NO];
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}
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@end
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