16 files changed, 236 insertions, 3 deletions
diff --git a/lib/mix/tasks/pleroma/instance.ex b/lib/mix/tasks/pleroma/instance.ex
index 6cee8d630..d276df93a 100644
--- a/lib/mix/tasks/pleroma/instance.ex
+++ b/lib/mix/tasks/pleroma/instance.ex
@@ -125,6 +125,7 @@ defmodule Mix.Tasks.Pleroma.Instance do
         )
 
       secret = :crypto.strong_rand_bytes(64) |> Base.encode64() |> binary_part(0, 64)
+      jwt_secret = :crypto.strong_rand_bytes(64) |> Base.encode64() |> binary_part(0, 64)
       signing_salt = :crypto.strong_rand_bytes(8) |> Base.encode64() |> binary_part(0, 8)
       {web_push_public_key, web_push_private_key} = :crypto.generate_key(:ecdh, :prime256v1)
 
@@ -142,6 +143,7 @@ defmodule Mix.Tasks.Pleroma.Instance do
           dbpass: dbpass,
           version: Pleroma.Mixfile.project() |> Keyword.get(:version),
           secret: secret,
+          jwt_secret: jwt_secret,
           signing_salt: signing_salt,
           web_push_public_key: Base.url_encode64(web_push_public_key, padding: false),
           web_push_private_key: Base.url_encode64(web_push_private_key, padding: false)
diff --git a/lib/mix/tasks/pleroma/sample_config.eex b/lib/mix/tasks/pleroma/sample_config.eex
index 52bd57cb7..ec7d8821e 100644
--- a/lib/mix/tasks/pleroma/sample_config.eex
+++ b/lib/mix/tasks/pleroma/sample_config.eex
@@ -76,3 +76,5 @@ config :web_push_encryption, :vapid_details,
 #  storage_url: "https://swift-endpoint.prodider.com/v1/AUTH_<tenant>/<container>",
 #  object_url: "https://cdn-endpoint.provider.com/<container>"
 #
+
+config :joken, default_signer: "<%= jwt_secret %>"
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index eeb415084..76f8d9bcd 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -105,7 +105,8 @@ defmodule Pleroma.Application do
           id: :cachex_idem
         ),
         worker(Pleroma.FlakeId, []),
-        worker(Pleroma.ScheduledActivityWorker, [])
+        worker(Pleroma.ScheduledActivityWorker, []),
+        worker(Pleroma.QuantumScheduler, [])
       ] ++
         hackney_pool_children() ++
         [
@@ -125,7 +126,9 @@ defmodule Pleroma.Application do
     # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Pleroma.Supervisor]
-    Supervisor.start_link(children, opts)
+    result = Supervisor.start_link(children, opts)
+    :ok = after_supervisor_start()
+    result
   end
 
   defp setup_instrumenters do
@@ -183,4 +186,19 @@ defmodule Pleroma.Application do
       :hackney_pool.child_spec(pool, options)
     end
   end
+
+  defp after_supervisor_start() do
+    with digest_config <- Application.get_env(:pleroma, :email_notifications)[:digest],
+         true <- digest_config[:active],
+         %Crontab.CronExpression{} = schedule <-
+           Crontab.CronExpression.Parser.parse!(digest_config[:schedule]) do
+      Pleroma.QuantumScheduler.new_job()
+      |> Quantum.Job.set_name(:digest_emails)
+      |> Quantum.Job.set_schedule(schedule)
+      |> Quantum.Job.set_task(&Pleroma.DigestEmailWorker.run/0)
+      |> Pleroma.QuantumScheduler.add_job()
+    end
+
+    :ok
+  end
 end
diff --git a/lib/pleroma/digest_email_worker.ex b/lib/pleroma/digest_email_worker.ex
new file mode 100644
index 000000000..fa6067a03
--- /dev/null
+++ b/lib/pleroma/digest_email_worker.ex
@@ -0,0 +1,45 @@
+defmodule Pleroma.DigestEmailWorker do
+  import Ecto.Query
+  require Logger
+
+  # alias Pleroma.User
+
+  def run() do
+    Logger.warn("Running digester")
+    config = Application.get_env(:pleroma, :email_notifications)[:digest]
+    negative_interval = -Map.fetch!(config, :interval)
+    inactivity_threshold = Map.fetch!(config, :inactivity_threshold)
+    inactive_users_query = Pleroma.User.list_inactive_users_query(inactivity_threshold)
+
+    now = NaiveDateTime.truncate(NaiveDateTime.utc_now(), :second)
+
+    from(u in inactive_users_query,
+      where: fragment("? #> '{\"email_notifications\",\"digest\"}' @> 'true'", u.info),
+      where: u.last_digest_emailed_at < datetime_add(^now, ^negative_interval, "day"),
+      select: u
+    )
+    |> Pleroma.Repo.all()
+    |> run(:pre)
+  end
+
+  defp run(v, :pre) do
+    Logger.warn("Running for #{length(v)} users")
+    run(v)
+  end
+
+  defp run([]), do: :ok
+
+  defp run([user | users]) do
+    with %Swoosh.Email{} = email <- Pleroma.Emails.UserEmail.digest_email(user) do
+      Logger.warn("Sending to #{user.nickname}")
+      Pleroma.Emails.Mailer.deliver_async(email)
+    else
+      _ ->
+        Logger.warn("Skipping #{user.nickname}")
+    end
+
+    Pleroma.User.touch_last_digest_emailed_at(user)
+
+    run(users)
+  end
+end
diff --git a/lib/pleroma/emails/user_email.ex b/lib/pleroma/emails/user_email.ex
index 8502a0d0c..64f855112 100644
--- a/lib/pleroma/emails/user_email.ex
+++ b/lib/pleroma/emails/user_email.ex
@@ -5,7 +5,7 @@
 defmodule Pleroma.Emails.UserEmail do
   @moduledoc "User emails"
 
-  import Swoosh.Email
+  use Phoenix.Swoosh, view: Pleroma.Web.EmailView, layout: {Pleroma.Web.LayoutView, :email}
 
   alias Pleroma.Web.Endpoint
   alias Pleroma.Web.Router
@@ -92,4 +92,61 @@ defmodule Pleroma.Emails.UserEmail do
     |> subject("#{instance_name()} account confirmation")
     |> html_body(html_body)
   end
+
+  @doc """
+  Email used in digest email notifications
+  Includes Mentions and New Followers data
+  If there are no mentions (even when new followers exist), the function will return nil
+  """
+  @spec digest_email(Pleroma.User.t()) :: Swoosh.Email.t() | nil
+  def digest_email(user) do
+    new_notifications =
+      Pleroma.Notification.for_user_since(user, user.last_digest_emailed_at)
+      |> Enum.reduce(%{followers: [], mentions: []}, fn
+        %{activity: %{data: %{"type" => "Create"}, actor: actor}} = notification, acc ->
+          new_mention = %{data: notification, from: Pleroma.User.get_by_ap_id(actor)}
+          %{acc | mentions: [new_mention | acc.mentions]}
+
+        %{activity: %{data: %{"type" => "Follow"}, actor: actor}} = notification, acc ->
+          new_follower = %{data: notification, from: Pleroma.User.get_by_ap_id(actor)}
+          %{acc | followers: [new_follower | acc.followers]}
+
+        _, acc ->
+          acc
+      end)
+
+    with [_ | _] = mentions <- new_notifications.mentions do
+      html_data = %{
+        instance: instance_name(),
+        user: user,
+        mentions: mentions,
+        followers: new_notifications.followers,
+        unsubscribe_link: unsubscribe_url(user, "digest")
+      }
+
+      new()
+      |> to(recipient(user))
+      |> from(sender())
+      |> subject("Your digest from #{instance_name()}")
+      |> render_body("digest.html", html_data)
+    else
+      _ ->
+        nil
+    end
+  end
+
+  @doc """
+  Generate unsubscribe link for given user and notifications type.
+  The link contains JWT token with the data, and subscription can be modified without
+  authorization.
+  """
+  @spec unsubscribe_url(Pleroma.User.t(), String.t()) :: String.t()
+  def unsubscribe_url(user, notifications_type) do
+    token =
+      %{"sub" => user.id, "act" => %{"unsubscribe" => notifications_type}, "exp" => false}
+      |> Pleroma.JWT.generate_and_sign!()
+      |> Base.encode64()
+
+    Router.Helpers.subscription_url(Pleroma.Web.Endpoint, :unsubscribe, token)
+  end
 end
diff --git a/lib/pleroma/jwt.ex b/lib/pleroma/jwt.ex
new file mode 100644
index 000000000..10102ff5d
--- /dev/null
+++ b/lib/pleroma/jwt.ex
@@ -0,0 +1,9 @@
+defmodule Pleroma.JWT do
+  use Joken.Config
+
+  @impl true
+  def token_config do
+    default_claims(skip: [:aud])
+    |> add_claim("aud", &Pleroma.Web.Endpoint.url/0, &(&1 == Pleroma.Web.Endpoint.url()))
+  end
+end
diff --git a/lib/pleroma/quantum_scheduler.ex b/lib/pleroma/quantum_scheduler.ex
new file mode 100644
index 000000000..9a3df81f6
--- /dev/null
+++ b/lib/pleroma/quantum_scheduler.ex
@@ -0,0 +1,4 @@
+defmodule Pleroma.QuantumScheduler do
+  use Quantum.Scheduler,
+    otp_app: :pleroma
+end
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index 7053dfaf3..2509d2366 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -1484,4 +1484,40 @@ defmodule Pleroma.User do
           is_nil(max(a.inserted_at))
     )
   end
+
+  @doc """
+  Enable or disable email notifications for user
+
+  ## Examples
+
+      iex> Pleroma.User.switch_email_notifications(Pleroma.User{info: %{email_notifications: %{"digest" => false}}}, "digest", true)
+      Pleroma.User{info: %{email_notifications: %{"digest" => true}}}
+
+      iex> Pleroma.User.switch_email_notifications(Pleroma.User{info: %{email_notifications: %{"digest" => true}}}, "digest", false)
+      Pleroma.User{info: %{email_notifications: %{"digest" => false}}}
+  """
+  @spec switch_email_notifications(t(), String.t(), boolean()) ::
+          {:ok, t()} | {:error, Ecto.Changeset.t()}
+  def switch_email_notifications(user, type, status) do
+    info = Pleroma.User.Info.update_email_notifications(user.info, %{type => status})
+
+    change(user)
+    |> put_embed(:info, info)
+    |> update_and_set_cache()
+  end
+
+  @doc """
+  Set `last_digest_emailed_at` value for the user to current time
+  """
+  @spec touch_last_digest_emailed_at(t()) :: t()
+  def touch_last_digest_emailed_at(user) do
+    now = NaiveDateTime.truncate(NaiveDateTime.utc_now(), :second)
+
+    {:ok, updated_user} =
+      user
+      |> change(%{last_digest_emailed_at: now})
+      |> update_and_set_cache()
+
+    updated_user
+  end
 end
diff --git a/lib/pleroma/web/mailer/subscription_controller.ex b/lib/pleroma/web/mailer/subscription_controller.ex
new file mode 100644
index 000000000..2334ebacb
--- /dev/null
+++ b/lib/pleroma/web/mailer/subscription_controller.ex
@@ -0,0 +1,18 @@
+defmodule Pleroma.Web.Mailer.SubscriptionController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.{JWT, Repo, User}
+
+  def unsubscribe(conn, %{"token" => encoded_token}) do
+    with {:ok, token} <- Base.decode64(encoded_token),
+         {:ok, claims} <- JWT.verify_and_validate(token),
+         %{"act" => %{"unsubscribe" => type}, "sub" => uid} <- claims,
+         %User{} = user <- Repo.get(User, uid),
+         {:ok, _user} <- User.switch_email_notifications(user, type, false) do
+      render(conn, "unsubscribe_success.html", email: user.email)
+    else
+      _err ->
+        render(conn, "unsubscribe_failure.html")
+    end
+  end
+end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 8b665d61b..09e51e602 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -562,6 +562,8 @@ defmodule Pleroma.Web.Router do
     post("/push/hub/:nickname", Websub.WebsubController, :websub_subscription_request)
     get("/push/subscriptions/:id", Websub.WebsubController, :websub_subscription_confirmation)
     post("/push/subscriptions/:id", Websub.WebsubController, :websub_incoming)
+
+    get("/mailer/unsubscribe/:token", Mailer.SubscriptionController, :unsubscribe)
   end
 
   scope "/", Pleroma.Web do
diff --git a/lib/pleroma/web/templates/email/digest.html.eex b/lib/pleroma/web/templates/email/digest.html.eex
new file mode 100644
index 000000000..93c9c884f
--- /dev/null
+++ b/lib/pleroma/web/templates/email/digest.html.eex
@@ -0,0 +1,20 @@
+<h1>Hey <%= @user.nickname %>, here is what you've missed!</h1>
+
+<h2>New Mentions:</h2>
+<ul>
+<%= for %{data: mention, from: from} <- @mentions do %>
+  <li><%= link from.nickname, to: mention.activity.actor %>: <%= raw mention.activity.object.data["content"] %></li>
+<% end %>
+</ul>
+
+<%= if @followers != [] do %>
+<h2><%= length(@followers) %> New Followers:</h2>
+<ul>
+<%= for %{data: follow, from: from} <- @followers do %>
+  <li><%= link from.nickname, to: follow.activity.actor %></li>
+<% end %>
+</ul>
+<% end %>
+
+<p>You have received this email because you have signed up to receive digest emails from <b><%= @instance %></b> Pleroma instance.</p>
+<p>The email address you are subscribed as is <%= @user.email %>. To unsubscribe, please go <%= link "here", to: @unsubscribe_link %>.</p>
+\ No newline at end of file
diff --git a/lib/pleroma/web/templates/layout/email.html.eex b/lib/pleroma/web/templates/layout/email.html.eex
new file mode 100644
index 000000000..f6dcd7f0f
--- /dev/null
+++ b/lib/pleroma/web/templates/layout/email.html.eex
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title><%= @email.subject %></title>
+  </head>
+  <body>
+    <%= render @view_module, @view_template, assigns %>
+  </body>
+</html>
+\ No newline at end of file
diff --git a/lib/pleroma/web/templates/mailer/subscription/unsubscribe_failure.html.eex b/lib/pleroma/web/templates/mailer/subscription/unsubscribe_failure.html.eex
new file mode 100644
index 000000000..7b476f02d
--- /dev/null
+++ b/lib/pleroma/web/templates/mailer/subscription/unsubscribe_failure.html.eex
@@ -0,0 +1 @@
+<h1>UNSUBSCRIBE FAILURE</h1>
diff --git a/lib/pleroma/web/templates/mailer/subscription/unsubscribe_success.html.eex b/lib/pleroma/web/templates/mailer/subscription/unsubscribe_success.html.eex
new file mode 100644
index 000000000..6dfa2c185
--- /dev/null
+++ b/lib/pleroma/web/templates/mailer/subscription/unsubscribe_success.html.eex
@@ -0,0 +1 @@
+<h1>UNSUBSCRIBE SUCCESSFUL</h1>
diff --git a/lib/pleroma/web/views/email_view.ex b/lib/pleroma/web/views/email_view.ex
new file mode 100644
index 000000000..b63eb162c
--- /dev/null
+++ b/lib/pleroma/web/views/email_view.ex
@@ -0,0 +1,5 @@
+defmodule Pleroma.Web.EmailView do
+  use Pleroma.Web, :view
+  import Phoenix.HTML
+  import Phoenix.HTML.Link
+end
diff --git a/lib/pleroma/web/views/mailer/subscription_view.ex b/lib/pleroma/web/views/mailer/subscription_view.ex
new file mode 100644
index 000000000..fc3d20816
--- /dev/null
+++ b/lib/pleroma/web/views/mailer/subscription_view.ex
@@ -0,0 +1,3 @@
+defmodule Pleroma.Web.Mailer.SubscriptionView do
+  use Pleroma.Web, :view
+end