Extract callbacks to a new module

src/CrossSigningManager.js

@@ -0,0 +1,62 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import Modal from './Modal';
+import sdk from './index';
+import { deriveKey } from 'matrix-js-sdk/lib/crypto/key_passphrase';
+import { decodeRecoveryKey } from 'matrix-js-sdk/lib/crypto/recoverykey';
+
+// This stores the cross-signing private keys in memory for the JS SDK. They are
+// also persisted to Secure Secret Storage in account data by the JS SDK when
+// created.
+const crossSigningKeys = {};
+
+// XXX: On desktop platforms, we plan to store only the SSSS default key in a
+// secure enclave, while the cross-signing private keys will still be retrieved
+// from SSSS, so it's unclear that we actually need these cross-signing
+// application callbacks for Riot. Should the JS SDK default to in-memory
+// storage of these itself?
+export const getCrossSigningKey = k => crossSigningKeys[k];
+export const saveCrossSigningKeys = newKeys => Object.assign(crossSigningKeys, newKeys);
+
+// XXX: This flow should maybe be reworked to allow retries in case of typos,
+// etc.
+export const getSecretStorageKey = async keyInfos => {
+    const keyInfoEntries = Object.entries(keyInfos);
+    if (keyInfoEntries.length > 1) {
+        throw new Error("Multiple storage key requests not implemented");
+    }
+    const [name, info] = keyInfoEntries[0];
+    const AccessSecretStorageDialog =
+        sdk.getComponent("dialogs.secretstorage.AccessSecretStorageDialog");
+    const { finished } = Modal.createTrackedDialog("Access Secret Storage dialog", "",
+        AccessSecretStorageDialog, {
+        keyInfo: info,
+    },
+    );
+    const [input] = await finished;
+    if (!input) {
+        throw new Error("Secret storage access canceled");
+    }
+    let key;
+    const { passphrase } = info;
+    if (passphrase) {
+        key = await deriveKey(input, passphrase.salt, passphrase.iterations);
+    } else {
+        key = decodeRecoveryKey(input);
+    }
+    return [name, key];
+};