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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/phoenix_kit_web/users/magic_link_verify.ex
defmodule PhoenixKitWeb.Users.MagicLinkVerify do
@moduledoc """
Controller for handling magic link verification and authentication.
This controller handles the server-side verification of magic link tokens
when users click on the links received via email.
"""
use PhoenixKitWeb, :controller
alias PhoenixKit.Utils.Routes
alias PhoenixKit.Users.MagicLink
alias PhoenixKitWeb.Users.Auth, as: UserAuth
@doc """
Verifies a magic link token and logs the user in.
This is the endpoint that magic link URLs point to. It:
1. Verifies the token is valid and not expired
2. Logs the user in by creating a session
3. Redirects to the appropriate post-login destination
4. Handles invalid/expired tokens gracefully
"""
def verify(conn, %{"token" => token} = params) do
case MagicLink.verify_magic_link(token) do
{:ok, user} ->
# A magic-link user just proved control of their own inbox on this
# device, so the session persists by default — without the remember-me
# cookie the login rides a browser-session cookie that mobile browsers
# drop overnight. There's no checkbox to tick when arriving from an
# email, so this follows the site-wide policy setting.
# log_in_user/3 reads :user_return_to from the session, so stash the
# (re-sanitized) destination the emailed link carried before signing in.
conn
|> maybe_store_return_to(params["return_to"])
|> put_flash(:info, "Successfully logged in with magic link!")
|> UserAuth.log_in_user(user, UserAuth.remember_me_params())
{:error, :invalid_token} ->
conn
|> put_flash(:error, "Magic link is invalid or has expired. Please request a new one.")
|> redirect(to: Routes.path("/users/log-in"))
end
end
def verify(conn, _params) do
conn
|> put_flash(:error, "Invalid magic link. Please request a new one.")
|> redirect(to: Routes.path("/users/log-in"))
end
defp maybe_store_return_to(conn, return_to) do
if Routes.local_path?(return_to) do
put_session(conn, :user_return_to, return_to)
else
conn
end
end
end