fix(security): replace RSS feed URL tokens with encrypted token (M5)

2 files changed, 32 insertions, 2 deletions

diff --git a/src/lib/Settings/Categories/RSSFeeds.svelte b/src/lib/Settings/Categories/RSSFeeds.svelte
index 49a6eb5a..303db699 100644
--- a/src/lib/Settings/Categories/RSSFeeds.svelte
+++ b/src/lib/Settings/Categories/RSSFeeds.svelte
@@ -7,19 +7,21 @@ import { appOrigin } from "$lib/Utility/appOrigin";
 import locale from "$stores/locale";
 import SettingHint from "../SettingHint.svelte";
 
-export let user: { accessToken: string; refreshToken: string };
+export let feedToken: string | undefined;
 </script>
 
 <button
   data-umami-event="Copy RSS Feed URL"
   onclick={() => {
+    if (!feedToken) return;
+
     addNotification(
       options({
         heading: get(locale)().notifications?.rssCopied ?? 'RSS feed URL copied to clipboard'
       })
     );
     navigator.clipboard.writeText(
-      `${appOrigin()}/feeds/activity-notifications?token=${user.accessToken}&refresh=${user.refreshToken}`
+      `${appOrigin()}/feeds/activity-notifications?feed=${feedToken}`
     );
   }}
 >
diff --git a/src/lib/Utility/anilistOauth.ts b/src/lib/Utility/anilistOauth.ts
new file mode 100644
index 00000000..26654ec9
--- /dev/null
+++ b/src/lib/Utility/anilistOauth.ts
@@ -0,0 +1,28 @@
+import { env } from "$env/dynamic/private";
+import { env as publicEnv } from "$env/dynamic/public";
+
+// Exchange a refresh token for a fresh access token WITHOUT touching the auth
+// cookie. Used by the RSS feed, which is polled by an unattended reader that has
+// no session; the interactive /api/oauth/refresh endpoint additionally re-sets
+// the cookie, which this deliberately does not.
+export const refreshAniListToken = async (
+	refreshToken: string,
+): Promise<string | null> => {
+	const formData = new FormData();
+
+	formData.append("grant_type", "refresh_token");
+	formData.append("client_id", publicEnv.PUBLIC_ANILIST_CLIENT_ID as string);
+	formData.append("client_secret", env.ANILIST_CLIENT_SECRET as string);
+	formData.append("refresh_token", refreshToken);
+
+	const response = await fetch("https://anilist.co/api/v2/oauth/token", {
+		method: "POST",
+		body: formData,
+	});
+
+	if (!response.ok) return null;
+
+	const payload = (await response.json()) as { access_token?: string };
+
+	return payload.access_token ?? null;
+};