Add JsonRpc helpers

1 files changed, 70 insertions, 0 deletions

diff --git a/ios/MullvadVPN/JsonRpc.swift b/ios/MullvadVPN/JsonRpc.swift
new file mode 100644
index 0000000000..887d6b67df
--- /dev/null
+++ b/ios/MullvadVPN/JsonRpc.swift
@@ -0,0 +1,70 @@
+//
+//  JsonRpc.swift
+//  MullvadVPN
+//
+//  Created by pronebird on 02/05/2019.
+//  Copyright © 2019 Amagicom AB. All rights reserved.
+//
+
+import Foundation
+
+typealias JsonRpcRequestId = String
+struct JsonRpcRequest<T: Encodable>: Encodable {
+    let version = "2.0"
+    let id: JsonRpcRequestId = UUID().uuidString
+    let method: String
+    let params: [T]
+    
+    fileprivate enum CodingKeys: String, CodingKey {
+        case version = "jsonrpc", id, method, params
+    }
+}
+
+extension JsonRpcRequest where T == NoData {
+    init(method: String) {
+        self.init(method: method, params: [])
+    }
+}
+
+struct NoData: Encodable {}
+
+class JsonRpcResponseError: Error, Decodable {
+    let serverErrorMessage: String
+    
+    init(serverErrorMessage: String) {
+        self.serverErrorMessage = serverErrorMessage
+    }
+    
+    var localizedDescription: String? {
+        return serverErrorMessage
+    }
+    
+    required init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        
+        serverErrorMessage = try container.decode(String.self)
+    }
+}
+
+struct JsonRpcResponse<T: Decodable>: Decodable {
+    let version: String
+    let id: JsonRpcRequestId
+    let result: Result<T, JsonRpcResponseError>
+    
+    private enum CodingKeys: String, CodingKey {
+        case version = "jsonrpc", id, result, error
+    }
+    
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        
+        self.version = try container.decode(String.self, forKey: .version)
+        self.id = try container.decode(String.self, forKey: .id)
+        
+        if container.contains(.result) {
+            self.result = .success(try container.decode(T.self, forKey: .result))
+        } else {
+            self.result = .failure(try container.decode(JsonRpcResponseError.self, forKey: .error))
+        }
+    }
+}