Specify supported open id subject types

lib/comfycamp_web/controllers/oauth_json.ex

@@ -15,6 +15,7 @@ defmodule ComfycampWeb.OauthJSON do
       token_endpoint: "https://comfycamp.space/oauth/token",
       userinfo_endpoint: "https://comfycamp.space/oauth/userinfo",
       jwks_uri: "https://comfycamp.space/.well-known/jwks.json",
+      subject_types_supported: ["public"],
       response_types_supported: ["code"],
       id_token_signing_alg_values_supported: ["HS256"],
       scopes_supported: ["openid", "profile", "email"],

lib/comfycamp_web/user_auth.ex

@@ -117,7 +117,7 @@ defmodule ComfycampWeb.UserAuth do
   def fetch_bearer_token(conn, _opts) do
     case Plug.Conn.get_req_header(conn, "authorization") do
       ["Bearer " <> b64token] ->
-        token = Base.decode64(b64token)
+        token = Base.url_decode64!(b64token)
         user = Accounts.get_user_by_bearer_token(token)
         assign(conn, :oauth_user, user)