work

src/routes/api/github/install/callback/+server.ts

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+import { redirect, error } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { githubInstallation } from '$lib/server/db/schema';
+import { decodeInstallState, getGitHubInstallation } from '$lib/server/github-app';
+
+export const GET = async ({ url, locals }) => {
+	const installationId = url.searchParams.get('installation_id');
+	const state = decodeInstallState(url.searchParams.get('state') ?? undefined);
+
+	if (!installationId) throw error(400, 'Missing installation_id');
+	if (!state.userId) throw error(400, 'Missing install state');
+	if (!locals.user || locals.user.id !== state.userId) throw redirect(302, '/auth/login');
+
+	const installation = await getGitHubInstallation(installationId);
+	const accountLogin = installation.account?.login ?? 'github';
+
+	await db
+		.insert(githubInstallation)
+		.values({
+			userId: locals.user.id,
+			installationId,
+			accountLogin
+		})
+		.onConflictDoUpdate({
+			target: githubInstallation.installationId,
+			set: {
+				userId: locals.user.id,
+				accountLogin,
+				updatedAt: new Date()
+			}
+		});
+
+	throw redirect(303, state.redirect);
+};