Add ExtensionStore (from @polkadot/extension) (#142)

* Add ExtensionStore (from @polkadot/extension)

* Consistent naming, untested/unused File store

* Update File.ts

packages/ui-keyring/src/stores/Browser.ts

@@ -6,7 +6,7 @@ import { KeyringStore } from '../types';
 
 import store from 'store';
 
-export default class Store implements KeyringStore {
+export default class BrowserStore implements KeyringStore {
   all (cb: (key: string, value: any) => void): void {
     store.each((value: any, key: string) =>
       cb(key, value)

packages/ui-keyring/src/stores/Extension.ts

@@ -0,0 +1,58 @@
+// Copyright 2019 @polkadot/ui-keyring authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { KeyringStore } from '../types';
+
+import extension from 'extensionizer';
+
+const lastError = (type: string): void => {
+  const error = extension.runtime.lastError;
+
+  if (error) {
+    console.error(`ExtensionStore.${type}:: runtime.lastError:`, error);
+  }
+};
+
+export default class ExtensionStore implements KeyringStore {
+  all (cb: (key: string, value: any) => void): void {
+    extension.storage.local.get(null, (result: { [index: string]: any }) => {
+      lastError('all');
+
+      Object.entries(result).forEach(([key, value]) =>
+        cb(key, value)
+      );
+    });
+  }
+
+  get (key: string, cb: (value: any) => void): void {
+    extension.storage.local.get([key], (result: { [index: string]: any }) => {
+      lastError('get');
+
+      cb(result[key]);
+    });
+  }
+
+  remove (key: string, cb?: () => void): void {
+    extension.storage.local.remove(key, () => {
+      lastError('remove');
+
+      cb && cb();
+    });
+  }
+
+  set (key: string, value: any, cb?: () => void): void {
+    // shortcut, don't save testing accounts in extension storage
+    if (key.indexOf('account:') === 0 && value.meta && value.meta.isTesting) {
+      cb && cb();
+
+      return;
+    }
+
+    extension.storage.local.set({ [key]: value }, () => {
+      lastError('set');
+
+      cb && cb();
+    });
+  }
+}

packages/ui-keyring/src/stores/File.ts

@@ -0,0 +1,53 @@
+// Copyright 2017-2019 @polkadot/ui-keyring authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { KeyringStore } from '../types';
+
+import fs from 'fs';
+import mkdirp from 'mkdirp';
+import path from 'path';
+
+// NOTE untested and unused by any known apps, probably broken in various mysterious ways
+export default class FileStore implements KeyringStore {
+  private _path: string;
+
+  constructor (path: string) {
+    if (!fs.existsSync(path)) {
+      mkdirp.sync(path);
+    }
+
+    this._path = path;
+  }
+
+  all (cb: (key: string, value: any) => void): void {
+    fs
+      .readdirSync(this._path)
+      .filter((key) => !['.', '..'].includes(key))
+      .forEach((key) => cb(key, this._readKey(key)));
+  }
+
+  get (key: string, cb: (value: any) => void): void {
+    cb(this._readKey(key));
+  }
+
+  remove (key: string, cb?: () => void): void {
+    fs.unlinkSync(this._getPath(key));
+    cb && cb();
+  }
+
+  set (key: string, value: any, cb?: () => void): void {
+    fs.writeFileSync(this._getPath(key), Buffer.from(JSON.stringify(value), 'utf-8'));
+    cb && cb();
+  }
+
+  private _getPath (key: string): string {
+    return path.join(this._path, key);
+  }
+
+  private _readKey (key: string): any {
+    return JSON.parse(
+      fs.readFileSync(this._getPath(key)).toString('utf-8')
+    );
+  }
+}

packages/ui-keyring/src/stores/index.ts

@@ -0,0 +1,7 @@
+// Copyright 2017-2019 @polkadot/ui-keyring authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+export { default as BrowserStore } from './Browser';
+export { default as ExtensionStore } from './Extension';
+export { default as FileStore } from './File';