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BOOL isDarkImage(UIImage* inputImage){
    
    BOOL isDark = FALSE;
    
    CFDataRef imageData = CGDataProviderCopyData(CGImageGetDataProvider(inputImage.CGImage));
    const UInt8 *pixels = CFDataGetBytePtr(imageData);
    
    int darkPixels = 0;
    
    int length = CFDataGetLength(imageData);

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public struct CoreDataContextObserverState : OptionSetType {
    static public let Inserted: ContextWatcher.CoreDataContextObserverState
    static public let Updated: ContextWatcher.CoreDataContextObserverState
    static public let Deleted: ContextWatcher.CoreDataContextObserverState
    static public let Refreshed: ContextWatcher.CoreDataContextObserverState
    static public let All: CoreDataContextObserverState
}
public typealias CoreDataContextObserverCompletionBlock = (NSManagedObject, CoreDataContextObserverState) -> ()

public class CoreDataContextObserver {

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class var userDateFormatter : NSDateFormatter {
struct Static {
    static let instance: NSDateFormatter = {
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
        return dateFormatter
        }()
    }
    return Static.instance
}

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//...

let configuration = SocialServiceBrowserConfigurator(client: SocialServiceBrowserDropboxClient(), selectionMode: .select)
let viewController = SocialServiceBrowserViewController(configuration: configuration, uiConfiguration: configuration)
viewController.delegate = self
present(UINavigationController(rootViewController: viewController), animated: true, completion: nil)

//...

extension ViewController: SocialServiceBrowserViewControllerDelegate {

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public protocol SocialServiceBrowserClient {
    var serviceName: String { get }

    func requestRootNode(with completion: @escaping (SocialServiceBrowserResult<SocialServiceBrowerNodeListResponse, Error>) -> Void) -> SocialServiceBrowserOperationPerformable?
    func requestChildren(`for` node: SocialServiceBrowerNode, withCompletion completion: @escaping (SocialServiceBrowserResult<SocialServiceBrowerNodeListResponse, Error>) -> Void) -> SocialServiceBrowserOperationPerformable?
    func requestThumbnail(`for` node: SocialServiceBrowerNode, withCompletion: @escaping (SocialServiceBrowserResult<UIImage, Error>) -> Void) -> SocialServiceBrowserOperationPerformable?
    func requestData(`for` node: SocialServiceBrowerNode, withCompletion: @escaping (SocialServiceBrowserResult<URL, Error>) -> Void) -> SocialServiceBrowserOperationPerformable?
}

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extension Files.Metadata: SocialServiceBrowerNode {
    public var nodeId: String? {
        if let file = self as? Files.FileMetadata {
            return file.id
        }
        if let folder = self as? Files.FolderMetadata {
            return folder.id
        }
        return nil
    }

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class SocialServiceBrowserDropboxClient: SocialServiceBrowserClient {
    var serviceName: String = "Dropbox"
    
    var filter: SocialServiceBrowserFilterType = .none
    private var client: DropboxClient? {
        return DropboxClientsManager.authorizedClient
    }
    
    func requestRootNode(with completion: @escaping (SocialServiceBrowserResult<SocialServiceBrowerNodeListResponse, Error>) -> Void) -> SocialServiceBrowserOperationPerformable? {
        return client?.files.listFolder(path: "").response(completionHandler: { [weak self] response, error in

m1entus

#!/bin/sh

if [ "$#" != 3 ]; then
    echo "Illegal number of parameters, usage: ./make_cert.sh apn_file key_file output_filename"
fi

eval "openssl x509 -in $1.cer -inform DER -out $1.pem -outform PEM"
eval "openssl pkcs12 -nodes -export -inkey $2.key -in $1.pem -out $1.p12"
eval "openssl pkcs12 -nodes -nocerts -out $2.pem -in $1.p12"
eval "cat $1.pem $2.pem > $3.pem"

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// http://stackoverflow.com/questions/17535918/aes-gets-different-results-in-ios-and-java

- (NSData *)AES256EncryptWithKey:(NSString *)key {
    // 'key' should be 32 bytes for AES256, will be null-padded otherwise
    char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused)
    bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
    
    // fetch key data
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    

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//
//  CoreDataContextWatcher.swift
//  ContextWatcher
//
//  Created by Michal Zaborowski on 10.05.2016.
//  Copyright © 2016 Inspace Labs Sp z o. o. Spółka Komandytowa. All rights reserved.
//

import Foundation
import CoreData