mobilizon.chapril.org-mobil.../lib/mobilizon_web/resolvers/event.ex

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defmodule MobilizonWeb.Resolvers.Event do
@moduledoc """
Handles the event-related GraphQL calls
"""
alias Mobilizon.Activity
alias Mobilizon.Events
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alias Mobilizon.Events.{Event, Participant}
alias Mobilizon.Actors.Actor
alias Mobilizon.Users.User
# We limit the max number of events that can be retrieved
@event_max_limit 100
@number_of_related_events 3
def list_events(_parent, %{page: page, limit: limit}, _resolution)
when limit < @event_max_limit do
{:ok, Mobilizon.Events.list_events(page, limit)}
end
def list_events(_parent, %{page: _page, limit: _limit}, _resolution) do
{:error, :events_max_limit_reached}
end
def find_event(_parent, %{uuid: uuid}, _resolution) do
case Mobilizon.Events.get_event_full_by_uuid(uuid) do
nil ->
{:error, "Event with UUID #{uuid} not found"}
event ->
{:ok, event}
end
end
@doc """
List participant for event (separate request)
"""
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def list_participants_for_event(_parent, %{uuid: uuid, page: page, limit: limit}, _resolution) do
{:ok, Mobilizon.Events.list_participants_for_event(uuid, page, limit)}
end
@doc """
List participants for event (through an event request)
"""
def list_participants_for_event(%Event{uuid: uuid}, _args, _resolution) do
{:ok, Mobilizon.Events.list_participants_for_event(uuid, 1, 10)}
end
@doc """
List related events
"""
def list_related_events(
%Event{tags: tags, organizer_actor: organizer_actor},
_args,
_resolution
) do
# We get the organizer's next public event
events =
[Events.get_actor_upcoming_public_event(organizer_actor, uuid)] |> Enum.filter(&is_map/1)
# uniq_by : It's possible event_from_same_actor is inside events_from_tags
events =
(events ++
Events.find_similar_events_by_common_tags(
tags,
@number_of_related_events - length(events)
))
|> uniq_events()
# TODO: We should use tag_relations to find more appropriate events
# We've considered all recommended events, so we fetch the latest events
events =
if @number_of_related_events - length(events) > 0 do
(events ++
Events.list_events(1, @number_of_related_events, :begins_on, :asc, true, true))
|> uniq_events()
else
events
end
events =
events
# We remove the same event from the results
|> Enum.filter(fn event -> event.uuid != uuid end)
# We return only @number_of_related_events right now
|> Enum.take(@number_of_related_events)
# TODO: We should use tag_relations to find more events
{:ok, events}
end
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@doc """
Join an event for an actor
"""
def actor_join_event(
_parent,
%{actor_id: actor_id, event_id: event_id},
%{
context: %{
current_user: user
}
}
) do
with {:is_owned, true, actor} <- User.owns_actor(user, actor_id),
{:ok, %Event{} = event} <- Mobilizon.Events.get_event(event_id),
{:error, :participant_not_found} <- Mobilizon.Events.get_participant(event_id, actor_id),
role <- Mobilizon.Events.get_default_participant_role(event),
{:ok, participant} <-
Mobilizon.Events.create_participant(%{
role: role,
event_id: event.id,
actor_id: actor.id
}),
participant <-
Map.put(participant, :event, event)
|> Map.put(:actor, actor) do
{:ok, participant}
else
{:is_owned, false} ->
{:error, "Actor id is not owned by authenticated user"}
{:error, :event_not_found} ->
{:error, "Event id not found"}
{:ok, %Participant{}} ->
{:error, "You are already a participant of this event"}
end
end
def actor_join_event(_parent, _args, _resolution) do
{:error, "You need to be logged-in to join an event"}
end
@doc """
Leave an event for an actor
"""
def actor_leave_event(
_parent,
%{actor_id: actor_id, event_id: event_id},
%{
context: %{
current_user: user
}
}
) do
with {:is_owned, true, _} <- User.owns_actor(user, actor_id),
{:ok, %Participant{} = participant} <-
Mobilizon.Events.get_participant(event_id, actor_id),
{:only_organizer, false} <-
{:only_organizer, check_that_participant_is_not_only_organizer(event_id, actor_id)},
{:ok, _} <-
Mobilizon.Events.delete_participant(participant) do
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{:ok, %{event: %{id: event_id}, actor: %{id: actor_id}}}
else
{:is_owned, false} ->
{:error, "Actor id is not owned by authenticated user"}
{:only_organizer, true} ->
{:error, "You can't leave event because you're the only event creator participant"}
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{:error, :participant_not_found} ->
{:error, "Participant not found"}
end
end
def actor_leave_event(_parent, _args, _resolution) do
{:error, "You need to be logged-in to leave an event"}
end
# We check that the actor asking to leave the event is not it's only organizer
# We start by fetching the list of organizers and if there's only one of them
# and that it's the actor requesting leaving the event we return true
@spec check_that_participant_is_not_only_organizer(integer(), integer()) :: boolean()
defp check_that_participant_is_not_only_organizer(event_id, actor_id) do
with [%Participant{actor: %Actor{id: participant_actor_id}}] <-
Mobilizon.Events.list_organizers_participants_for_event(event_id) do
participant_actor_id == actor_id
else
_ -> false
end
end
@doc """
Create an event
"""
def create_event(_parent, args, %{context: %{current_user: _user}}) do
with {:ok, %Activity{data: %{"object" => %{"type" => "Event"} = object}}} <-
MobilizonWeb.API.Events.create_event(args) do
{:ok,
%Event{
title: object["name"],
description: object["content"],
uuid: object["uuid"],
url: object["id"]
}}
end
end
def create_event(_parent, _args, _resolution) do
{:error, "You need to be logged-in to create events"}
end
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@doc """
Delete an event
"""
def delete_event(_parent, %{event_id: event_id, actor_id: actor_id}, %{
context: %{current_user: user}
}) do
with {:ok, %Event{} = event} <- Mobilizon.Events.get_event(event_id),
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{:is_owned, true, _} <- User.owns_actor(user, actor_id),
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{:event_can_be_managed, true} <- Event.can_event_be_managed_by(event, actor_id),
event <- Mobilizon.Events.delete_event!(event) do
{:ok, %{id: event.id}}
else
{:error, :event_not_found} ->
{:error, "Event not found"}
{:is_owned, false} ->
{:error, "Actor id is not owned by authenticated user"}
{:event_can_be_managed, false} ->
{:error, "You cannot delete this event"}
end
end
def delete_event(_parent, _args, _resolution) do
{:error, "You need to be logged-in to delete an event"}
end
end