feat(frontend): add discord callback page

this only handles existing accounts for now, still need to write an action function

Foxnouns.Frontend/app/routes/auth.callback.discord/route.tsx

@@ -0,0 +1,84 @@
+import { json, LoaderFunctionArgs } from "@remix-run/node";
+import { type ApiError, ErrorCode } from "~/lib/api/error";
+import serverRequest, { writeCookie } from "~/lib/request.server";
+import { CallbackResponse } from "~/lib/api/auth";
+import { Form as RemixForm, Link, useLoaderData } from "@remix-run/react";
+import { Trans, useTranslation } from "react-i18next";
+import Form from "react-bootstrap/Form";
+import Button from "react-bootstrap/Button";
+
+export const loader = async ({ request }: LoaderFunctionArgs) => {
+	const url = new URL(request.url);
+
+	const code = url.searchParams.get("code");
+	const state = url.searchParams.get("state");
+
+	if (!code || !state)
+		throw { status: 400, code: ErrorCode.BadRequest, message: "Missing code or state" } as ApiError;
+
+	const resp = await serverRequest<CallbackResponse>("POST", "/auth/discord/callback", {
+		body: { code, state }
+	});
+
+	if (resp.has_account) {
+		return json(
+			{ hasAccount: true, user: resp.user!, ticket: null, remoteUser: null },
+			{
+				headers: {
+					"Set-Cookie": writeCookie("pronounscc-token", resp.token!)
+				}
+			}
+		);
+	}
+
+	return json({
+		hasAccount: false,
+		user: null,
+		ticket: resp.ticket!,
+		remoteUser: resp.remote_username!
+	});
+};
+
+// TODO: action function
+
+export default function DiscordCallbackPage() {
+	const { t } = useTranslation();
+	const data = useLoaderData<typeof loader>();
+
+	if (data.hasAccount) {
+		const username = data.user!.username;
+		
+		return (
+			<>
+				<h1>{t("log-in.callback.success")}</h1>
+				<p>
+					<Trans t={t} i18nKey={"log-in.callback.success-link"} values={{ username: data.user!.username }}>
+						{/* @ts-expect-error react-i18next handles interpolation here */}
+						Welcome back, <Link to={`/@${data.user!.username}`}>@{{username}}</Link>!
+					</Trans>
+					<br />
+					{t("log-in.callback.redirect-hint")}
+				</p>
+			</>
+		);
+	}
+
+	return (
+		<RemixForm method="POST">
+			<Form as="div">
+				<Form.Group className="mb-3" controlId="remote-username">
+					<Form.Label>{t("log-in.callback.remote-username.discord")}</Form.Label>
+					<Form.Control type="text" readOnly={true} value={data.remoteUser!} />
+				</Form.Group>
+				<Form.Group className="mb-3" controlId="username">
+					<Form.Label>{t("log-in.callback.username")}</Form.Label>
+					<Form.Control name="username" type="text" required />
+				</Form.Group>
+				<input type="hidden" name="ticket" value={data.ticket!} />
+				<Button variant="primary" type="submit">
+					{t("log-in.callback.sign-up-button")}
+				</Button>
+			</Form>
+		</RemixForm>
+	);
+}

Foxnouns.Frontend/app/routes/auth.log-in/route.tsx

@@ -10,7 +10,7 @@ import Form from "react-bootstrap/Form";
 import Button from "react-bootstrap/Button";
 import ButtonGroup from "react-bootstrap/ButtonGroup";
 import ListGroup from "react-bootstrap/ListGroup";
-import { Container, Row, Col } from "react-bootstrap";
+import { Row, Col } from "react-bootstrap";
 import { useTranslation } from "react-i18next";
 import i18n from "~/i18next.server";
 import serverRequest, { getToken, writeCookie } from "~/lib/request.server";
@@ -72,7 +72,7 @@ export default function LoginPage() {
 	const actionData = useActionData<typeof action>();
 
 	return (
-		<Container>
+		<>
 			<Row>
 				<Col md className="mb-4">
 					<h2>{t("log-in.form-title")}</h2>
@@ -121,7 +121,7 @@ export default function LoginPage() {
 					</ListGroup>
 				</Col>
 			</Row>
-		</Container>
+		</>
 	);
 }