Bring back ability to find out provider for profile page

packages/backend/convex/auth.ts

@@ -25,13 +25,25 @@ const getUserById = async (
   if (!user) throw new ConvexError('User not found.');
   return user;
 };
-const isSignedIn = async (ctx: QueryCtx): Promise<Doc<'users'> | null> => {
-  const userId = await getAuthUserId(ctx);
-  if (!userId) return null;
+const getAuthAccountById = async (ctx: QueryCtx, userId: Id<'users'>) => {
   const user = await ctx.db.get(userId);
-  if (!user) return null;
-  return user;
+  if (!user) throw new ConvexError('User not found.');
+  const authAccount = await ctx.db
+    .query('authAccounts')
+    .withIndex('userIdAndProvider', (q) => q.eq('userId', userId))
+    .first();
+  if (!authAccount) throw new ConvexError('Auth account not found');
+  return authAccount;
 };
+export const getUserProvider = query({
+  args: { userId: v.optional(v.id('users')) },
+  handler: async (ctx, args) => {
+    const userId = args.userId ?? (await getAuthUserId(ctx));
+    if (!userId) return null;
+    const authAccount = await getAuthAccountById(ctx, userId);
+    return authAccount.provider;
+  },
+});
 
 export const getUser = query({
   args: { userId: v.optional(v.id('users')) },