Add basically support for encrypted app list syncing

src/action/replytokeyrequest.ts

@@ -0,0 +1,74 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { AppLogicAction } from './basetypes'
+import { InvalidActionParameterException } from './meta/exception'
+import { assertSafeInteger } from './meta/util'
+
+const actionType = 'ReplyToKeyRequestAction'
+
+export class ReplyToKeyRequestAction extends AppLogicAction {
+  readonly requestServerSequenceNumber: number
+  readonly tempKey: Buffer
+  readonly encryptedKey: Buffer
+  readonly signature: Buffer
+
+  constructor ({
+    requestServerSequenceNumber,
+    tempKey,
+    encryptedKey,
+    signature
+  }: {
+    requestServerSequenceNumber: number
+    tempKey: Buffer
+    encryptedKey: Buffer
+    signature: Buffer
+  }) {
+    super()
+
+    assertSafeInteger({ value: requestServerSequenceNumber, field: 'requestServerSequenceNumber', actionType })
+
+    if (tempKey.length !== 32 || encryptedKey.length !== 16 || signature.length !== 64) {
+      throw new InvalidActionParameterException({
+        actionType,
+        staticMessage: 'key/signature has wrong length'
+      })
+    }
+
+    this.requestServerSequenceNumber = requestServerSequenceNumber
+    this.tempKey = tempKey
+    this.encryptedKey = encryptedKey
+    this.signature = signature
+  }
+
+  static parse = ({ rsn, tempKey, encryptedKey, signature }: SerializedReplyToKeyRequestAction) => (
+    new ReplyToKeyRequestAction({
+      requestServerSequenceNumber: rsn,
+      tempKey: Buffer.from(tempKey, 'base64'),
+      encryptedKey: Buffer.from(encryptedKey, 'base64'),
+      signature: Buffer.from(signature, 'base64')
+    })
+  )
+}
+
+export interface SerializedReplyToKeyRequestAction {
+  type: 'REPLY_TO_KEY_REQUEST'
+  rsn: number
+  tempKey: string
+  encryptedKey: string
+  signature: string
+}