Add expected Errors

Author: JZDesign

Sources/HTTPEngine/Errors.swift

@@ -0,0 +1,57 @@
+import Foundation
+
+public struct Errors {
+    enum Request: Error {
+        case invalidURL
+    }
+
+    enum Response: Error {
+        case couldNotRetrieveStatusCode
+        case unexpectedStatusCode(HTTPURLResponse)
+        case redirect(Int)
+        case unknown(Int)
+
+        enum ClientError: Error {
+            case badRequest_400
+            case invalidCredentials_401
+            case forbidden_403
+            case notFound_404
+            case notAllowed_405
+            case conflict_409
+            case tooManyRequests_429
+            case unkown(Int)
+        }
+
+        enum ServerError: Error {
+            case internalServerError_500
+            case notImplemented_501
+            case badGateway_502
+            case unavailable_503
+            case timeout_504
+            case unkown(Int)
+        }
+
+        static func errorWith(statusCode: Int) -> Error? {
+            switch statusCode {
+            case 200...299: return nil
+            case 300...399: return Errors.Response.redirect(statusCode)
+            case 400: return Errors.Response.ClientError.badRequest_400
+            case 401: return Errors.Response.ClientError.invalidCredentials_401
+            case 403: return Errors.Response.ClientError.forbidden_403
+            case 404: return Errors.Response.ClientError.notFound_404
+            case 405: return Errors.Response.ClientError.notAllowed_405
+            case 409: return Errors.Response.ClientError.conflict_409
+            case 429: return Errors.Response.ClientError.tooManyRequests_429
+            case 402, 410...418, 430...499: return Errors.Response.ClientError.unkown(statusCode)
+            case 500: return Errors.Response.ServerError.internalServerError_500
+            case 501: return Errors.Response.ServerError.notImplemented_501
+            case 502: return Errors.Response.ServerError.badGateway_502
+            case 503: return Errors.Response.ServerError.unavailable_503
+            case 504: return Errors.Response.ServerError.timeout_504
+            case 505...599: return Errors.Response.ServerError.unkown(statusCode)
+            default:
+                return Errors.Response.unknown(statusCode)
+            }
+        }
+    }
+}