feat(#89): Add backup functionality for google drive and dropbox

src/routes/api/integrations/google-drive/connect/+server.ts

@@ -0,0 +1,64 @@
+import { redirect } from '@sveltejs/kit';
+import type { RequestEvent } from '@sveltejs/kit';
+import PokedexRepository from '$lib/repositories/PokedexRepository';
+import { requireAuth } from '$lib/utils/auth';
+import { createOAuthState, setOAuthStateCookie } from '$lib/utils/oauthState';
+import { getEnv } from '$lib/utils/env';
+
+export const GET = async (event: RequestEvent) => {
+	const userId = await requireAuth(event);
+	const url = new URL(event.request.url);
+	const pokedexId = url.searchParams.get('pokedexId');
+	const fileName = url.searchParams.get('fileName');
+	const folderId = url.searchParams.get('folderId');
+	const returnToRaw = url.searchParams.get('returnTo');
+	const returnTo =
+		returnToRaw && returnToRaw.startsWith('/') ? returnToRaw : '/backup-settings';
+
+	if (pokedexId) {
+		const { session } = await event.locals.safeGetSession();
+		if (session) {
+			await event.locals.supabase.auth.setSession(session);
+		}
+
+		const pokedexRepo = new PokedexRepository(event.locals.supabase, userId);
+		const pokedex = await pokedexRepo.findById(pokedexId);
+		if (!pokedex) {
+			throw redirect(302, '/my-pokedexes');
+		}
+	}
+
+	const env = getEnv();
+	const clientId = env.GOOGLE_OAUTH_CLIENT_ID;
+	if (!clientId) {
+		throw redirect(302, `/pokedex/${pokedexId}?export=google-missing-client`);
+	}
+
+	const state = createOAuthState();
+	setOAuthStateCookie(event, 'google_drive', {
+		state,
+		userId,
+		pokedexId,
+		provider: 'google_drive',
+		fileName,
+		folderId,
+		returnTo
+	});
+
+	const redirectUri = `${event.url.origin}/api/integrations/google-drive/callback`;
+	const params = new URLSearchParams({
+		client_id: clientId,
+		redirect_uri: redirectUri,
+		response_type: 'code',
+		scope: [
+			'https://www.googleapis.com/auth/drive.file',
+			'https://www.googleapis.com/auth/drive.metadata.readonly'
+		].join(' '),
+		access_type: 'offline',
+		prompt: 'consent',
+		include_granted_scopes: 'true',
+		state
+	});
+
+	throw redirect(302, `https://accounts.google.com/o/oauth2/v2/auth?${params.toString()}`);
+};