1 files changed, 50 insertions, 0 deletions
diff --git a/foray/ForayNetworkManager.swift b/foray/ForayNetworkManager.swift
new file mode 100644
index 0000000..ab1e2b5
--- /dev/null
+++ b/foray/ForayNetworkManager.swift
@@ -0,0 +1,50 @@
+//
+//  ForayNetworkManager.swift
+//  foray
+//
+//  Created by Nicholas Tay on 20/3/2022.
+//
+
+import Foundation
+
+class ForayNetworkManager {
+    static let shared = ForayNetworkManager()
+    
+    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 get<T: Decodable>(url: String,
+                           onComplete: @escaping ([T]) -> ()) {
+        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 (basicUsername != nil && basicPassword != nil) {
+            let authData = (basicUsername! + ":" + 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!)
+            
+            // Possibly passing back to UI, need to do it on the main thread (I think due to async?)
+            DispatchQueue.main.async { onComplete(items) }
+        }).resume()
+    }
+}