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//
// ForayNetworkManager.swift
// foray
//
// Created by Nicholas Tay on 20/3/2022.
//
import Foundation
class ForayFetcher {
var basicUsername: String? = nil
var basicPassword: String? = nil
// Reuse JSON decoder, allows for customisation of things like date decode if required
var jsonDecoder: JSONDecoder = {
let jd = JSONDecoder()
// Defaults to year-month-date format
jd.dateDecodingStrategy = .custom({ (decoder) -> Date in
let container = try decoder.singleValueContainer()
let dateStr = try container.decode(String.self)
let dateFormat = DateFormatter()
dateFormat.dateFormat = "yyyy-MM-dd"
return dateFormat.date(from: dateStr)!
})
return jd
}()
func fetch<T: Decodable>(url: String,
receiver: @escaping (T) -> ()) {
// Fetch on a background thread
DispatchQueue.global(qos: .background).async {
var request = URLRequest(url: URL(string: url)!)
request.cachePolicy = .reloadRevalidatingCacheData // Needed otherwise default caching policy seems not to check properly
// Basic auth if required
if (self.basicUsername != nil && self.basicPassword != nil) {
let authData = (self.basicUsername! + ":" + self.basicPassword!).data(using: .utf8)!.base64EncodedString()
request.addValue("Basic \(authData)", forHTTPHeaderField: "Authorization")
}
URLSession.shared.dataTask(with: request, completionHandler: { data, response, error -> Void in
let items = try! self.jsonDecoder.decode(T.self, from: data!)
receiver(items)
}).resume()
}
}
}
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