mobilizon/lib/graphql/resolvers/post.ex

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defmodule Mobilizon.GraphQL.Resolvers.Post do
@moduledoc """
Handles the posts-related GraphQL calls
"""
import Mobilizon.Users.Guards
alias Mobilizon.{Actors, Posts, Users}
alias Mobilizon.Actors.Actor
alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Posts.Post
alias Mobilizon.Storage.Page
alias Mobilizon.Users.User
require Logger
@public_accessible_visibilities [:public, :unlisted]
@doc """
Find posts for group.
Returns only if actor requesting is a member of the group
"""
def find_posts_for_group(
%Actor{id: group_id} = group,
%{page: page, limit: limit} = args,
%{
context: %{
current_user: %User{role: user_role} = user
}
} = _resolution
) do
with %Actor{id: actor_id} <- Users.get_actor_for_user(user),
{:member, true} <-
{:member, Actors.is_member?(actor_id, group_id) or is_moderator(user_role)},
%Page{} = page <- Posts.get_posts_for_group(group, page, limit) do
{:ok, page}
else
{:member, _} ->
find_posts_for_group(group, args, nil)
end
end
def find_posts_for_group(
%Actor{} = group,
%{page: page, limit: limit},
_resolution
) do
with %Page{} = page <- Posts.get_public_posts_for_group(group, page, limit) do
{:ok, page}
end
end
def find_posts_for_group(
_group,
_args,
_resolution
) do
{:ok, %Page{total: 0, elements: []}}
end
def get_post(
parent,
%{slug: slug},
%{
context: %{
current_user: %User{} = user
}
} = _resolution
) do
with {:current_actor, %Actor{id: actor_id}} <-
{:current_actor, Users.get_actor_for_user(user)},
{:post, %Post{attributed_to: %Actor{id: group_id}} = post} <-
{:post, Posts.get_post_by_slug_with_preloads(slug)},
{:member, true} <- {:member, Actors.is_member?(actor_id, group_id)} do
{:ok, post}
else
{:member, false} -> get_post(parent, %{slug: slug}, nil)
{:post, _} -> {:error, "No such post"}
end
end
def get_post(
_parent,
%{slug: slug},
_resolution
) do
case {:post, Posts.get_post_by_slug_with_preloads(slug)} do
{:post, %Post{visibility: visibility, draft: false} = post}
when visibility in @public_accessible_visibilities ->
{:ok, post}
{:post, _} ->
{:error, "No such post"}
end
end
def get_post(_parent, _args, _resolution) do
{:error, "No such post"}
end
def create_post(
_parent,
%{attributed_to_id: group_id} = args,
%{
context: %{
current_user: %User{} = user
}
} = _resolution
) do
with %Actor{id: actor_id} <- Users.get_actor_for_user(user),
{:member, true} <- {:member, Actors.is_member?(actor_id, group_id)},
{:ok, _, %Post{} = post} <-
ActivityPub.create(
:post,
args
|> Map.put(:author_id, actor_id)
|> Map.put(:attributed_to_id, group_id),
true,
%{}
) do
{:ok, post}
else
{:own_check, _} ->
{:error, "Parent post doesn't match this group"}
{:member, _} ->
{:error, "Actor id is not member of group"}
end
end
def create_post(_parent, _args, _resolution) do
{:error, "You need to be logged-in to create posts"}
end
def update_post(
_parent,
%{id: id} = args,
%{
context: %{
current_user: %User{} = user
}
} = _resolution
) do
with {:uuid, {:ok, _uuid}} <- {:uuid, Ecto.UUID.cast(id)},
%Actor{id: actor_id} <- Users.get_actor_for_user(user),
{:post, %Post{attributed_to: %Actor{id: group_id}} = post} <-
{:post, Posts.get_post_with_preloads(id)},
{:member, true} <- {:member, Actors.is_member?(actor_id, group_id)},
{:ok, _, %Post{} = post} <-
ActivityPub.update(post, args, true, %{}) do
{:ok, post}
else
{:uuid, :error} ->
{:error, "Post ID is not a valid ID"}
{:post, _} ->
{:error, "Post doesn't exist"}
{:member, _} ->
{:error, "Actor id is not member of group"}
end
end
def update_post(_parent, _args, _resolution) do
{:error, "You need to be logged-in to update posts"}
end
def delete_post(
_parent,
%{id: post_id},
%{
context: %{
current_user: %User{} = user
}
} = _resolution
) do
with {:uuid, {:ok, _uuid}} <- {:uuid, Ecto.UUID.cast(post_id)},
%Actor{id: actor_id} = actor <- Users.get_actor_for_user(user),
{:post, %Post{attributed_to: %Actor{id: group_id}} = post} <-
{:post, Posts.get_post_with_preloads(post_id)},
{:member, true} <- {:member, Actors.is_member?(actor_id, group_id)},
{:ok, _, %Post{} = post} <-
ActivityPub.delete(post, actor) do
{:ok, post}
else
{:uuid, :error} ->
{:error, "Post ID is not a valid ID"}
{:post, _} ->
{:error, "Post doesn't exist"}
{:member, _} ->
{:error, "Actor id is not member of group"}
end
end
def delete_post(_parent, _args, _resolution) do
{:error, "You need to be logged-in to delete posts"}
end
end