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import UIKit | |
typealias JSON = [String : Any] | |
fileprivate let imageCache = NSCache<NSString, UIImage>() | |
extension NSError { | |
static func generalParsingError(domain: String) -> Error { | |
return NSError(domain: domain, code: 400, userInfo: [NSLocalizedDescriptionKey : NSLocalizedString("Error retrieving data", comment: "General Parsing Error Description")]) | |
} | |
} | |
class MTAPIClient { | |
//MARK: - Public | |
static func downloadImage(url: URL, completion: @escaping (_ image: UIImage?, _ error: Error? ) -> Void) { | |
if let cachedImage = imageCache.object(forKey: url.absoluteString as NSString) { | |
completion(cachedImage, nil) | |
} else { | |
MTAPIClient.downloadData(url: url) { data, response, error in | |
if let error = error { | |
completion(nil, error) | |
} else if let data = data, let image = UIImage(data: data) { | |
imageCache.setObject(image, forKey: url.absoluteString as NSString) | |
completion(image, nil) | |
} else { | |
completion(nil, NSError.generalParsingError(domain: url.absoluteString)) | |
} | |
} | |
} | |
} | |
static func search(for query: String, page: Int, completion: @escaping (_ responseObject: [String : Any]?, _ error: Error?) -> Void) { | |
if let encodedQuery = query.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed), | |
let url = URL(string:"http://www.omdbapi.com/?s=\(encodedQuery)&page=\(page)") { | |
MTAPIClient.downloadData(url: url) { data, response, error in | |
if let error = error { | |
completion(nil, error) | |
} else { | |
if let data = data, let responseObject = self.convertToJSON(with: data) { | |
completion(responseObject, nil) | |
} else { | |
completion(nil, NSError.generalParsingError(domain: url.absoluteString)) | |
} | |
} | |
} | |
} | |
} | |
//MARK: - Private | |
fileprivate static func downloadData(url: URL, completion: @escaping (_ data: Data?, _ response: URLResponse?, _ error: Error?) -> Void) { | |
URLSession(configuration: .ephemeral).dataTask(with: URLRequest(url: url)) { data, response, error in | |
completion(data, response, error) | |
}.resume() | |
} | |
fileprivate static func convertToJSON(with data: Data) -> JSON? { | |
do { | |
return try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? JSON | |
} catch { | |
return nil | |
} | |
} | |
} |
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