COVIDSafe code from version 2.2 (#42)

CovidSafe/API/ChangePostcodeAPI.swift

@@ -0,0 +1,58 @@
+//
+//  ChangePostcodeAPI.swift
+//  CovidSafe
+//
+//  Copyright © 2020 Australian Government. All rights reserved.
+//
+
+import Foundation
+import Alamofire
+
+class ChangePostcodeAPI: CovidSafeAuthenticatedAPI {
+        
+    static func changePostcode(newPostcode: String,
+                                  completion: @escaping (CovidSafeAPIError?) -> Void) {
+
+        guard let apiHost = PlistHelper.getvalueFromInfoPlist(withKey: "API_Host", plistName: "CovidSafe-config") else {
+            return
+        }
+        
+        guard let headers = try? authenticatedHeaders() else {
+            completion(.TokenExpiredError)
+            return
+        }
+        
+        let params = [
+            "postcode": newPostcode,
+            ]
+        CovidNetworking.shared.session.request("\(apiHost)/device",
+            method: .post,
+            parameters: params,
+            encoding: JSONEncoding.default,
+            headers: headers,
+            interceptor: CovidRequestRetrier(retries:3)).validate().responseDecodable(of: DeviceResponse.self) { (response) in
+                switch response.result {
+                case .success:
+                    completion(nil)
+                case .failure(_):
+                    guard let statusCode = response.response?.statusCode else {
+                        completion(.UnknownError)
+                        return
+                    }
+                    if (statusCode >= 400 && statusCode < 500) {
+                        completion(.RequestError)
+                        return
+                    }
+                    completion(.ServerError)
+                }
+        }
+    }
+}
+
+struct DeviceResponse: Decodable {
+    let message: String?
+    
+    enum CodingKeys: String, CodingKey {
+        case message
+    }
+}