element-call-custom/src/auth/LoginPage.tsx

/*
Copyright 2021-2022 New Vector Ltd

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 { FC, FormEvent, useCallback, useRef, useState } from "react";
import { useHistory, useLocation, Link } from "react-router-dom";
import { Trans, useTranslation } from "react-i18next";
import { Button } from "@vector-im/compound-web";

import Logo from "../icons/LogoLarge.svg?react";
import { useClient } from "../ClientContext";
import { FieldRow, InputField, ErrorMessage } from "../input/Input";
import styles from "./LoginPage.module.css";
import { useInteractiveLogin } from "./useInteractiveLogin";
import { usePageTitle } from "../usePageTitle";
import { PosthogAnalytics } from "../analytics/PosthogAnalytics";
import { Config } from "../config/Config";

export const LoginPage: FC = () => {
  const { t } = useTranslation();
  usePageTitle(t("login_title"));

  const { setClient } = useClient();
  const login = useInteractiveLogin();
  const homeserver = Config.defaultHomeserverUrl(); // TODO: Make this configurable
  const usernameRef = useRef<HTMLInputElement>(null);
  const passwordRef = useRef<HTMLInputElement>(null);
  const history = useHistory();
  const location = useLocation();
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<Error>();

  // TODO: Handle hitting login page with authenticated client

  const onSubmitLoginForm = useCallback(
    (e: FormEvent<HTMLFormElement>) => {
      e.preventDefault();
      setLoading(true);

      if (!homeserver || !usernameRef.current || !passwordRef.current) {
        setError(Error("Login parameters are undefined"));
        setLoading(false);
        return;
      }

      login(homeserver, usernameRef.current.value, passwordRef.current.value)
        .then(([client, session]) => {
          if (!setClient) {
            return;
          }

          setClient({ client, session });

          const locationState = location.state;
          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
          // @ts-ignore
          if (locationState && locationState.from) {
            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
            // @ts-ignore
            history.push(locationState.from);
          } else {
            history.push("/");
          }
          PosthogAnalytics.instance.eventLogin.track();
        })
        .catch((error) => {
          setError(error);
          setLoading(false);
        });
    },
    [login, location, history, homeserver, setClient],
  );
  // we need to limit the length of the homserver name to not cover the whole loginview input with the string.
  let shortendHomeserverName = Config.defaultServerName()?.slice(0, 25);
  shortendHomeserverName =
    shortendHomeserverName?.length !== Config.defaultServerName()?.length
      ? shortendHomeserverName + "..."
      : shortendHomeserverName;
  return (
    <>
      <div className={styles.container}>
        <div className={styles.content}>
          <div className={styles.formContainer}>
            <Logo width="auto" height="auto" className={styles.logo} />

            <h2>{t("log_in")}</h2>
            <h4>{t("login_subheading")}</h4>
            <form onSubmit={onSubmitLoginForm}>
              <FieldRow>
                <InputField
                  type="text"
                  ref={usernameRef}
                  placeholder={t("common.username")}
                  label={t("common.username")}
                  autoCorrect="off"
                  autoCapitalize="none"
                  prefix="@"
                  suffix={`:${shortendHomeserverName}`}
                  data-testid="login_username"
                />
              </FieldRow>
              <FieldRow>
                <InputField
                  type="password"
                  ref={passwordRef}
                  placeholder={t("common.password")}
                  label={t("common.password")}
                  data-testid="login_password"
                />
              </FieldRow>
              {error && (
                <FieldRow>
                  <ErrorMessage error={error} />
                </FieldRow>
              )}
              <FieldRow>
                <Button
                  type="submit"
                  disabled={loading}
                  data-testid="login_login"
                >
                  {loading ? t("logging_in") : t("login_title")}
                </Button>
              </FieldRow>
            </form>
          </div>
          <div className={styles.authLinks}>
            <p>{t("login_auth_links_prompt")}</p>
            <p>
              <Trans i18nKey="login_auth_links">
                <Link to="/register">Create an account</Link>
                {" Or "}
                <Link to="/">Access as a guest</Link>
              </Trans>
            </p>
          </div>
        </div>
      </div>
    </>
  );
};