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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
Current section
Files
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Current section
Files
lib/phoenix_kit_web/users/confirmation_instructions.ex
defmodule PhoenixKitWeb.Users.ConfirmationInstructions do
@moduledoc """
LiveView for resending email confirmation instructions.
Allows users to request a new confirmation email if they didn't receive
the original or if the link expired. Only sends if the account exists
and is not already confirmed.
This page is also where the authentication gates park logged-in users
whose email is not yet confirmed (when `require_email_confirmation` is
on), so it moves them along as soon as confirmation happens:
- On mount, an already-confirmed user is redirected onward immediately —
covers a confirmation done elsewhere (or directly in the DB) followed
by a refresh, since the user is reloaded from the DB on every mount.
- While parked, the LiveView listens on this user's own confirmation topic
for `{:user_confirmed, user}` (broadcast by both the email-link flow and
the admin confirm action) and redirects onward live, no refresh needed —
e.g. when the user clicks the emailed link in another tab. It is a
per-user topic, not the site-wide admin users feed, so a parked
non-admin never receives other users' structs.
- A parked user can also fix a typo'd address instead of only resending to
it: "Wrong email?" reveals a bare new-address form — no password, unlike
Profile Settings' confirmed-user change-email flow, because there is no
live/confirmed account yet for a hijacked session to protect (see
`Auth.apply_unconfirmed_user_email/2`). The emailed link points
at `PhoenixKitWeb.Users.ConfirmEmailChange`
(`/users/confirm/change-email/:token`), NOT the normal
`/profile/settings/confirm-email/:token` landing page — that one sits
behind the authenticated-AND-confirmed live_session, which an
unconfirmed user fixing their email could never pass. Confirming the
*new* address there changes the account's email AND confirms it in one
step (`Auth.update_user_email/2` runs `confirm_changeset` either way),
so there is no separate "now confirm again" round trip.
"Onward" is `?return_to=` (stashed by the gate that parked them), then
the session's `user_return_to`, then the `after_login_path` setting.
"""
use PhoenixKitWeb, :live_view
require Logger
alias PhoenixKit.Admin.Events
alias PhoenixKit.Users.Auth
alias PhoenixKit.Users.RateLimiter
alias PhoenixKit.Utils.Routes
def mount(params, session, socket) do
user = socket.assigns[:phoenix_kit_current_user]
destination = resolve_destination(params, session, socket)
cond do
user && user.confirmed_at ->
{:ok, redirect(socket, to: destination)}
is_nil(user) ->
{:ok,
socket
|> assign(form: to_form(%{"email" => ""}, as: "user"))
|> assign(awaiting_confirmation?: false)
|> assign(destination: destination)}
true ->
# Subscribe FIRST, then re-read: a confirmation committed between the
# on_mount user load and the subscribe would otherwise be missed, and
# the page would sit there forever despite promising to continue
# automatically. Re-reading after subscribing closes that window —
# either the re-read sees it, or the broadcast reaches us.
if connected?(socket), do: Events.subscribe_to_user_confirmation(user.uuid)
if connected?(socket) and confirmed_since_mount?(user) do
{:ok, redirect(socket, to: destination)}
else
{:ok,
socket
|> assign(form: to_form(%{"email" => user.email}, as: "user"))
|> assign(awaiting_confirmation?: true)
|> assign(destination: destination)
|> assign(change_email?: false)
|> assign(email_form: to_form(Auth.change_user_email(user), as: "email_change"))
|> assign(confirmation_sent_at: Auth.get_last_confirmation_sent_at(user))}
end
end
end
defp confirmed_since_mount?(user) do
case Auth.get_user(user.uuid) do
%{confirmed_at: confirmed_at} -> not is_nil(confirmed_at)
_ -> false
end
end
def handle_event("send_instructions", %{"user" => %{"email" => submitted_email}}, socket) do
# A parked visitor is already authenticated — resend to THEIR account,
# never whatever the (still-editable) form field currently holds. Without
# this, a logged-in unconfirmed user could edit the pre-filled field to
# probe whether an arbitrary address exists, and get an honest answer
# back (see below) instead of the anonymous form's deliberately vague one.
email =
if socket.assigns.awaiting_confirmation? do
socket.assigns.phoenix_kit_current_user.email
else
submitted_email
end
# Throttle BEFORE the lookup and answer identically either way. This form
# is public: only an existing unconfirmed account does work (insert a token,
# send mail), so an unthrottled endpoint is both a targeted mail-flood
# vector and a timing oracle for which addresses are registered.
result =
with :ok <- RateLimiter.check_confirmation_resend_rate_limit(email),
%{} = user <- Auth.get_user_by_email(email) do
Auth.deliver_user_confirmation_instructions(
user,
&Routes.url("/users/confirm/#{&1}")
)
end
socket = flash_send_result(socket, result, email)
# A parked (logged-in, unconfirmed) user stays here so the live
# auto-advance can fire once they click the emailed link; anonymous
# visitors are sent on to the resolved destination.
if socket.assigns.awaiting_confirmation? do
sent_at =
Auth.get_last_confirmation_sent_at(socket.assigns.phoenix_kit_current_user)
{:noreply, assign(socket, confirmation_sent_at: sent_at)}
else
{:noreply, redirect(socket, to: socket.assigns.destination)}
end
end
def handle_event("toggle_change_email", _params, socket) do
if socket.assigns.awaiting_confirmation? do
{:noreply, update(socket, :change_email?, &(!&1))}
else
{:noreply, socket}
end
end
def handle_event("validate_email_change", params, socket) do
if socket.assigns.awaiting_confirmation? do
{:noreply, do_validate_email_change(params, socket)}
else
{:noreply, socket}
end
end
def handle_event("update_email", params, socket) do
if socket.assigns.awaiting_confirmation? do
{:noreply, do_update_email(params, socket)}
else
{:noreply, socket}
end
end
defp do_validate_email_change(%{"email_change" => user_params}, socket) do
email_form =
socket.assigns.phoenix_kit_current_user
|> Auth.change_user_email(user_params)
|> Map.put(:action, :validate)
|> to_form(as: "email_change")
assign(socket, email_form: email_form)
end
defp do_update_email(%{"email_change" => user_params}, socket) do
user = socket.assigns.phoenix_kit_current_user
case Auth.apply_unconfirmed_user_email(user, user_params) do
{:ok, applied_user} ->
Auth.deliver_user_update_email_instructions(
applied_user,
user.email,
&Routes.url("/users/confirm/change-email/#{&1}")
)
info =
gettext(
"We've sent a confirmation link to %{email}. Click it to finish updating your email — that also confirms your account.",
email: applied_user.email
)
socket
|> put_flash(:info, info)
|> assign(change_email?: false)
|> assign(email_form: to_form(Auth.change_user_email(user), as: "email_change"))
{:error, changeset} ->
assign(socket, email_form: to_form(changeset, as: "email_change", action: :insert))
end
end
def handle_info({:user_confirmed, %{uuid: uuid}}, socket) do
current = socket.assigns[:phoenix_kit_current_user]
if current && current.uuid == uuid do
{:noreply,
socket
|> put_flash(:info, gettext("Email confirmed. Welcome!"))
|> redirect(to: socket.assigns.destination)}
else
{:noreply, socket}
end
end
# Defensive: the topic carries only this user's confirmation today.
def handle_info(_msg, socket), do: {:noreply, socket}
# The anonymous path always shows the same vague copy no matter the outcome
# (unregistered address, rate limit, or a real mailer failure) — surfacing
# any of those as different from "sent" would tell an anonymous visitor
# whether an address is registered. A parked visitor is already logged in
# as that account, so there is nothing left to protect by hiding a real
# failure from them — and hiding it is exactly how "we sent it" survived a
# silent rate-limit block or mailer error undetected.
defp flash_send_result(socket, result, email) do
if socket.assigns.awaiting_confirmation? do
flash_parked_result(socket, result, email)
else
put_flash(
socket,
:info,
gettext(
"If your email is in our system and it has not been confirmed yet, you will receive an email with instructions shortly."
)
)
end
end
defp flash_parked_result(socket, {:ok, _email}, email) do
put_flash(
socket,
:info,
gettext("We've sent a new confirmation link to %{email}.", email: email)
)
end
defp flash_parked_result(socket, {:error, :rate_limit_exceeded}, _email) do
put_flash(
socket,
:error,
gettext(
"You've asked for this a few times already — please wait a few minutes and try again."
)
)
end
defp flash_parked_result(socket, {:error, :already_confirmed}, _email) do
put_flash(socket, :info, gettext("Your email is already confirmed."))
end
defp flash_parked_result(socket, other, email) do
Logger.error("Confirmation resend to #{email} failed: #{inspect(other)}")
put_flash(
socket,
:error,
gettext("We couldn't send that email just now — please try again in a moment.")
)
end
# `:context` threads the socket's router so `"/"` is only used where the
# host actually declares a root route. Without it the resolver synthesises
# `"/"` literally, which 404s on any host that has no root route — the
# configuration this entire branch exists to handle.
defp resolve_destination(params, session, socket) do
Routes.post_auth_path([params["return_to"], session["user_return_to"]],
context: socket,
scope: socket.assigns[:phoenix_kit_current_scope]
)
end
end