1 files changed, 48 insertions, 0 deletions
diff --git a/src/lib/oauth.ts b/src/lib/oauth.ts
new file mode 100644
index 00000000..53764fad
--- /dev/null
+++ b/src/lib/oauth.ts
@@ -0,0 +1,48 @@
+import { dev } from '$app/environment';
+import { redirect, type Cookies } from '@sveltejs/kit';
+
+export interface ClientOptions {
+	id: string;
+	secret: string;
+	redirectURI: string;
+}
+
+export interface CallbackOptions {
+	url: URL;
+	cookies: Cookies;
+	cookie: string;
+	authorise: string;
+	redirect?: string;
+	client: ClientOptions;
+}
+
+export const callback = async (options: CallbackOptions) => {
+	const { url, cookies, cookie, authorise, client } = options;
+	const formData = new FormData();
+
+	formData.append('grant_type', 'authorization_code');
+	formData.append('client_id', client.id);
+	formData.append('client_secret', client.secret);
+	formData.append('redirect_uri', client.redirectURI);
+	formData.append('code', url.searchParams.get('code') || 'null');
+	cookies.set(
+		cookie,
+		JSON.stringify(
+			await (
+				await fetch(authorise, {
+					method: 'POST',
+					body: formData
+				})
+			).json()
+		),
+		{
+			path: '/',
+			maxAge: 60 * 60 * 24 * 7,
+			httpOnly: true,
+			sameSite: 'lax',
+			secure: !dev
+		}
+	);
+
+	throw redirect(303, options.redirect ?? '/');
+};