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following_relationship.ex
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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.FollowingRelationship do
use Ecto.Schema
import Ecto.Changeset
import Ecto.Query
alias Ecto.Changeset
alias FlakeId.Ecto.CompatType
alias Pleroma.FollowingRelationship.State
alias Pleroma.Repo
alias Pleroma.User
schema "following_relationships" do
field(:state, State, default: :follow_pending)
belongs_to(:follower, User, type: CompatType)
belongs_to(:following, User, type: CompatType)
timestamps()
end
@doc "Returns underlying integer code for state atom"
def state_int_code(state_atom), do: State.__enum_map__() |> Keyword.fetch!(state_atom)
def accept_state_code, do: state_int_code(:follow_accept)
def changeset(%__MODULE__{} = following_relationship, attrs) do
following_relationship
|> cast(attrs, [:state])
|> put_assoc(:follower, attrs.follower)
|> put_assoc(:following, attrs.following)
|> validate_required([:state, :follower, :following])
|> unique_constraint(:follower_id,
name: :following_relationships_follower_id_following_id_index
)
|> validate_not_self_relationship()
end
def state_to_enum(state) when state in ["pending", "accept", "reject"] do
String.to_existing_atom("follow_#{state}")
end
def state_to_enum(state) do
raise "State is not convertible to Pleroma.FollowingRelationship.State: #{state}"
end
def get(%User{} = follower, %User{} = following) do
__MODULE__
|> where(follower_id: ^follower.id, following_id: ^following.id)
|> Repo.one()
end
def update(follower, following, :follow_reject), do: unfollow(follower, following)
def update(%User{} = follower, %User{} = following, state) do
case get(follower, following) do
nil ->
follow(follower, following, state)
following_relationship ->
with {:ok, _following_relationship} <-
following_relationship
|> cast(%{state: state}, [:state])
|> validate_required([:state])
|> Repo.update() do
after_update(state, follower, following)
end
end
end
def follow(%User{} = follower, %User{} = following, state \\ :follow_accept) do
with {:ok, _following_relationship} <-
%__MODULE__{}
|> changeset(%{follower: follower, following: following, state: state})
|> Repo.insert(on_conflict: :nothing) do
after_update(state, follower, following)
end
end
def unfollow(%User{} = follower, %User{} = following) do
case get(follower, following) do
%__MODULE__{} = following_relationship ->
with {:ok, _following_relationship} <- Repo.delete(following_relationship) do
after_update(:unfollow, follower, following)
end
_ ->
{:ok, nil}
end
end
defp after_update(state, %User{} = follower, %User{} = following) do
with {:ok, following} <- User.update_follower_count(following),
{:ok, follower} <- User.update_following_count(follower) do
Pleroma.Web.Streamer.stream("follow_relationship", %{
state: state,
following: following,
follower: follower
})
{:ok, follower, following}
end
end
def follower_count(%User{} = user) do
%{followers: user, deactivated: false}
|> User.Query.build()
|> Repo.aggregate(:count, :id)
end
def followers_query(%User{} = user) do
__MODULE__
|> join(:inner, [r], u in User, on: r.follower_id == u.id)
|> where([r], r.following_id == ^user.id)
|> where([r], r.state == ^:follow_accept)
end
def followers_ap_ids(user, from_ap_ids \\ nil)
def followers_ap_ids(_, []), do: []
def followers_ap_ids(%User{} = user, from_ap_ids) do
query =
user
|> followers_query()
|> select([r, u], u.ap_id)
query =
if from_ap_ids do
where(query, [r, u], u.ap_id in ^from_ap_ids)
else
query
end
Repo.all(query)
end
def following_count(%User{id: nil}), do: 0
def following_count(%User{} = user) do
%{friends: user, deactivated: false}
|> User.Query.build()
|> Repo.aggregate(:count, :id)
end
def get_follow_requests(%User{id: id}) do
__MODULE__
|> join(:inner, [r], f in assoc(r, :follower))
|> where([r], r.state == ^:follow_pending)
|> where([r], r.following_id == ^id)
|> where([r, f], f.is_active == true)
|> select([r, f], f)
|> Repo.all()
end
def following?(%User{id: follower_id}, %User{id: followed_id}) do
__MODULE__
|> where(follower_id: ^follower_id, following_id: ^followed_id, state: ^:follow_accept)
|> Repo.exists?()
end
def following_query(%User{} = user) do
__MODULE__
|> join(:inner, [r], u in User, on: r.following_id == u.id)
|> where([r], r.follower_id == ^user.id)
|> where([r], r.state == ^:follow_accept)
end
def outgoing_pending_follow_requests_query(%User{} = follower) do
__MODULE__
|> where([r], r.follower_id == ^follower.id)
|> where([r], r.state == ^:follow_pending)
end
def following(%User{} = user) do
following =
following_query(user)
|> select([r, u], u.follower_address)
|> Repo.all()
if not user.local or user.invisible do
following
else
[user.follower_address | following]
end
end
def move_following(origin, target) do
__MODULE__
|> join(:inner, [r], f in assoc(r, :follower))
|> where(following_id: ^origin.id)
|> where([r, f], f.allow_following_move == true)
|> where([r, f], f.local == true)
|> limit(50)
|> preload([:follower])
|> Repo.all()
|> Enum.map(fn following_relationship ->
Pleroma.Web.CommonAPI.follow(following_relationship.follower, target)
Pleroma.Web.CommonAPI.unfollow(following_relationship.follower, origin)
end)
|> case do
[] ->
User.update_follower_count(origin)
:ok
_ ->
move_following(origin, target)
end
end
def all_between_user_sets(
source_users,
target_users
)
when is_list(source_users) and is_list(target_users) do
source_user_ids = User.binary_id(source_users)
target_user_ids = User.binary_id(target_users)
__MODULE__
|> where(
fragment(
"(follower_id = ANY(?) AND following_id = ANY(?)) OR \
(follower_id = ANY(?) AND following_id = ANY(?))",
^source_user_ids,
^target_user_ids,
^target_user_ids,
^source_user_ids
)
)
|> Repo.all()
end
def find(following_relationships, follower, following) do
Enum.find(following_relationships, fn
fr -> fr.follower_id == follower.id and fr.following_id == following.id
end)
end
@doc """
For a query with joined activity's actor,
keeps rows where actor is followed by user -or- is NOT domain-blocked by user.
"""
def keep_following_or_not_domain_blocked(query, user) do
where(
query,
[_, user_actor: user_actor],
fragment(
# "(actor's domain NOT in domain_blocks) OR (actor IS in followed AP IDs)"
"""
NOT (substring(? from '.*://([^/]*)') = ANY(?)) OR
? = ANY(SELECT ap_id FROM users AS u INNER JOIN following_relationships AS fr
ON u.id = fr.following_id WHERE fr.follower_id = ? AND fr.state = ?)
""",
user_actor.ap_id,
^user.domain_blocks,
user_actor.ap_id,
^User.binary_id(user.id),
^accept_state_code()
)
)
end
defp validate_not_self_relationship(%Changeset{} = changeset) do
changeset
|> validate_follower_id_following_id_inequality()
|> validate_following_id_follower_id_inequality()
end
defp validate_follower_id_following_id_inequality(%Changeset{} = changeset) do
validate_change(changeset, :follower_id, fn _, follower_id ->
if follower_id == get_field(changeset, :following_id) do
[source_id: "can't be equal to following_id"]
else
[]
end
end)
end
defp validate_following_id_follower_id_inequality(%Changeset{} = changeset) do
validate_change(changeset, :following_id, fn _, following_id ->
if following_id == get_field(changeset, :follower_id) do
[target_id: "can't be equal to follower_id"]
else
[]
end
end)
end
@spec following_ap_ids(User.t()) :: [String.t()]
def following_ap_ids(%User{} = user) do
user
|> following_query()
|> select([r, u], u.ap_id)
|> Repo.all()
end
end

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