Add export E2E key (#178)

src/app/molecules/import-export-e2e-room-keys/ExportE2ERoomKeys.jsx

@@ -0,0 +1,100 @@
+import React, { useState, useEffect, useRef } from 'react';
+import './ExportE2ERoomKeys.scss';
+
+import FileSaver from 'file-saver';
+
+import initMatrix from '../../../client/initMatrix';
+import cons from '../../../client/state/cons';
+import { encryptMegolmKeyFile } from '../../../util/cryptE2ERoomKeys';
+
+import Text from '../../atoms/text/Text';
+import Button from '../../atoms/button/Button';
+import Input from '../../atoms/input/Input';
+import Spinner from '../../atoms/spinner/Spinner';
+
+import { useStore } from '../../hooks/useStore';
+
+function ExportE2ERoomKeys() {
+  const isMountStore = useStore();
+  const [status, setStatus] = useState({
+    isOngoing: false,
+    msg: null,
+    type: cons.status.PRE_FLIGHT,
+  });
+  const passwordRef = useRef(null);
+  const confirmPasswordRef = useRef(null);
+
+  const exportE2ERoomKeys = async () => {
+    const password = passwordRef.current.value;
+    if (password !== confirmPasswordRef.current.value) {
+      setStatus({
+        isOngoing: false,
+        msg: 'Password does not match.',
+        type: cons.status.ERROR,
+      });
+      return;
+    }
+    setStatus({
+      isOngoing: true,
+      msg: 'Getting keys...',
+      type: cons.status.IN_FLIGHT,
+    });
+    try {
+      const keys = await initMatrix.matrixClient.exportRoomKeys();
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: true,
+          msg: 'Encrypting keys...',
+          type: cons.status.IN_FLIGHT,
+        });
+      }
+      const encKeys = await encryptMegolmKeyFile(JSON.stringify(keys), password);
+      const blob = new Blob([encKeys], {
+        type: 'text/plain;charset=us-ascii',
+      });
+      FileSaver.saveAs(blob, 'cinny-keys.txt');
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: false,
+          msg: 'Successfully exported all keys.',
+          type: cons.status.SUCCESS,
+        });
+      }
+    } catch (e) {
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: false,
+          msg: e.friendlyText || 'Failed to export keys. Please try again.',
+          type: cons.status.ERROR,
+        });
+      }
+    }
+  };
+
+  useEffect(() => {
+    isMountStore.setItem(true);
+    return () => {
+      isMountStore.setItem(false);
+    };
+  }, []);
+
+  return (
+    <div className="export-e2e-room-keys">
+      <form className="export-e2e-room-keys__form" onSubmit={(e) => { e.preventDefault(); exportE2ERoomKeys(); }}>
+        <Input forwardRef={passwordRef} type="password" placeholder="Password" required />
+        <Input forwardRef={confirmPasswordRef} type="password" placeholder="Confirm password" required />
+        <Button disabled={status.isOngoing} variant="primary" type="submit">Export</Button>
+      </form>
+      { status.type === cons.status.IN_FLIGHT && (
+        <div className="import-e2e-room-keys__process">
+          <Spinner size="small" />
+          <Text variant="b2">{status.msg}</Text>
+        </div>
+      )}
+      {status.type === cons.status.SUCCESS && <Text className="import-e2e-room-keys__success" variant="b2">{status.msg}</Text>}
+      {status.type === cons.status.ERROR && <Text className="import-e2e-room-keys__error" variant="b2">{status.msg}</Text>}
+    </div>
+  );
+}
+
+export default ExportE2ERoomKeys;