Add export E2E key (#178)

src/app/molecules/import-export-e2e-room-keys/ImportE2ERoomKeys.jsx

@@ -0,0 +1,133 @@
+import React, { useState, useEffect, useRef } from 'react';
+import './ImportE2ERoomKeys.scss';
+
+import initMatrix from '../../../client/initMatrix';
+import cons from '../../../client/state/cons';
+import { decryptMegolmKeyFile } from '../../../util/cryptE2ERoomKeys';
+
+import Text from '../../atoms/text/Text';
+import IconButton from '../../atoms/button/IconButton';
+import Button from '../../atoms/button/Button';
+import Input from '../../atoms/input/Input';
+import Spinner from '../../atoms/spinner/Spinner';
+
+import CirclePlusIC from '../../../../public/res/ic/outlined/circle-plus.svg';
+
+import { useStore } from '../../hooks/useStore';
+
+function ImportE2ERoomKeys() {
+  const isMountStore = useStore();
+  const [keyFile, setKeyFile] = useState(null);
+  const [status, setStatus] = useState({
+    isOngoing: false,
+    msg: null,
+    type: cons.status.PRE_FLIGHT,
+  });
+  const inputRef = useRef(null);
+  const passwordRef = useRef(null);
+
+  async function tryDecrypt(file, password) {
+    try {
+      const arrayBuffer = await file.arrayBuffer();
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: true,
+          msg: 'Decrypting file...',
+          type: cons.status.IN_FLIGHT,
+        });
+      }
+
+      const keys = await decryptMegolmKeyFile(arrayBuffer, password);
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: true,
+          msg: 'Decrypting messages...',
+          type: cons.status.IN_FLIGHT,
+        });
+      }
+      await initMatrix.matrixClient.importRoomKeys(JSON.parse(keys));
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: false,
+          msg: 'Successfully imported all keys.',
+          type: cons.status.SUCCESS,
+        });
+        inputRef.current.value = null;
+        passwordRef.current.value = null;
+      }
+    } catch (e) {
+      if (isMountStore.getItem()) {
+        setStatus({
+          isOngoing: false,
+          msg: e.friendlyText || 'Failed to decrypt keys. Please try again.',
+          type: cons.status.ERROR,
+        });
+      }
+    }
+  }
+
+  const importE2ERoomKeys = () => {
+    const password = passwordRef.current.value;
+    if (password === '' || keyFile === null) return;
+    if (status.isOngoing) return;
+
+    tryDecrypt(keyFile, password);
+  };
+
+  const handleFileChange = (e) => {
+    const file = e.target.files.item(0);
+    passwordRef.current.value = '';
+    setKeyFile(file);
+    setStatus({
+      isOngoing: false,
+      msg: null,
+      type: cons.status.PRE_FLIGHT,
+    });
+  };
+  const removeImportKeysFile = () => {
+    if (status.isOngoing) return;
+    inputRef.current.value = null;
+    passwordRef.current.value = null;
+    setKeyFile(null);
+    setStatus({
+      isOngoing: false,
+      msg: null,
+      type: cons.status.PRE_FLIGHT,
+    });
+  };
+
+  useEffect(() => {
+    isMountStore.setItem(true);
+    return () => {
+      isMountStore.setItem(false);
+    };
+  }, []);
+
+  return (
+    <div className="import-e2e-room-keys">
+      <input ref={inputRef} onChange={handleFileChange} style={{ display: 'none' }} type="file" />
+
+      <form className="import-e2e-room-keys__form" onSubmit={(e) => { e.preventDefault(); importE2ERoomKeys(); }}>
+        { keyFile !== null && (
+          <div className="import-e2e-room-keys__file">
+            <IconButton onClick={removeImportKeysFile} src={CirclePlusIC} tooltip="Remove file" />
+            <Text>{keyFile.name}</Text>
+          </div>
+        )}
+        {keyFile === null && <Button onClick={() => inputRef.current.click()}>Import keys</Button>}
+        <Input forwardRef={passwordRef} type="password" placeholder="Password" required />
+        <Button disabled={status.isOngoing} variant="primary" type="submit">Decrypt</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 ImportE2ERoomKeys;