shop

src/config/instagramAuth.ts

@@ -0,0 +1,41 @@
+/**
+ * Instagram OAuth Client ID — public; same value as modstagram-back INSTAGRAM_CLIENT_ID.
+ * Left empty until a Meta App is configured; InstagramSignInButton renders nothing
+ * when this (and the runtime /api/auth/config value) are both empty.
+ */
+export const INSTAGRAM_OAUTH_CLIENT_ID = "";
+
+/** Must exactly match INSTAGRAM_REDIRECT_URI configured on the backend and in the Meta App. */
+export function getInstagramRedirectUri(): string {
+  if (typeof window === "undefined") return "";
+  return `${window.location.origin}/auth/instagram/callback`;
+}
+
+export type InstagramAuthMode = "login" | "register" | "link";
+
+/**
+ * Only the scope needed to read the connected account's basic profile.
+ * Media-read scope is added in M2 once content import is built.
+ */
+const INSTAGRAM_SCOPE = "instagram_business_basic";
+
+export function buildInstagramAuthorizeUrl({
+  clientId,
+  mode,
+  nonce,
+}: {
+  clientId: string;
+  mode: InstagramAuthMode;
+  nonce: string;
+}): string {
+  const state = encodeURIComponent(JSON.stringify({ mode, nonce }));
+  const params = new URLSearchParams({
+    client_id: clientId,
+    redirect_uri: getInstagramRedirectUri(),
+    scope: INSTAGRAM_SCOPE,
+    response_type: "code",
+    state,
+  });
+
+  return `https://www.instagram.com/oauth/authorize?${params.toString()}`;
+}