debianize-mobilizon/lib/mobilizon/medias/medias.ex

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defmodule Mobilizon.Medias do
@moduledoc """
The Media context.
"""
import Ecto.Query
import Mobilizon.Storage.CustomFunctions
alias Ecto.Multi
alias Mobilizon.Actors.Actor
alias Mobilizon.Medias.{File, Media}
alias Mobilizon.Storage.{Page, Repo}
alias Mobilizon.Users.User
alias Mobilizon.Web.Upload
require Logger
@doc """
Gets a single media.
"""
@spec get_media(integer | String.t()) :: Media.t() | nil
def get_media(id), do: Repo.get(Media, id)
@doc """
Gets a single media.
Raises `Ecto.NoResultsError` if the media does not exist.
"""
@spec get_media!(integer | String.t()) :: Media.t()
def get_media!(id), do: Repo.get!(Media, id)
@doc """
Get a media by its URL.
"""
@spec get_media_by_url(String.t()) :: Media.t() | nil
def get_media_by_url(url) do
url
|> media_by_url_query()
|> limit(1)
|> Repo.one()
end
@doc """
Get all media by an URL.
"""
@spec get_all_media_by_url(String.t()) :: Media.t() | nil
def get_all_media_by_url(url) do
url
|> String.split("?", parts: 2)
|> hd
|> media_by_url_query()
|> Repo.all()
end
@doc """
List the paginated media for user
"""
@spec medias_for_user(integer | String.t(), integer | nil, integer | nil) :: Page.t()
def medias_for_user(user_id, page, limit) do
user_id
|> medias_for_user_query()
|> Page.build_page(page, limit)
end
@doc """
Calculate the sum of media size used by the user
"""
@spec media_size_for_actor(integer | String.t()) :: integer()
def media_size_for_actor(actor_id) do
actor_id
|> medias_for_actor_query()
|> select([:file])
|> Repo.all()
|> Enum.map(& &1.file.size)
|> Enum.filter(& &1)
|> Enum.sum()
end
@doc """
Calculate the sum of media size used by the user
"""
@spec media_size_for_user(integer | String.t()) :: integer()
def media_size_for_user(user_id) do
user_id
|> medias_for_user_query()
|> select([:file])
|> Repo.all()
|> Enum.map(& &1.file.size)
|> Enum.sum()
end
@doc """
Creates a media.
"""
@spec create_media(map) :: {:ok, Media.t()} | {:error, Ecto.Changeset.t()}
def create_media(attrs \\ %{}) do
%Media{}
|> Media.changeset(attrs)
|> Repo.insert()
end
@doc """
Deletes a media.
"""
@spec delete_media(Media.t()) :: {:ok, Media.t()} | {:error, Ecto.Changeset.t()}
def delete_media(%Media{} = media, opts \\ []) do
transaction =
Multi.new()
|> Multi.delete(:media, media)
|> Multi.run(:remove, fn _repo, %{media: %Media{} = media} ->
delete_file_from_media(media, opts)
end)
|> Repo.transaction()
case transaction do
{:ok, %{media: %Media{} = media}} ->
{:ok, media}
{:error, :remove, error, _} ->
{:error, error}
end
end
@spec delete_file_from_media(Media.t(), Keyword.t()) :: {:ok, Media.t()} | {:error, atom()}
defp delete_file_from_media(%Media{file: %File{url: url}} = media, opts) do
if can_delete_media_file?(media) do
case Upload.remove(url) do
{:error, err} ->
if err == :enofile and Keyword.get(opts, :ignore_file_not_found, false) do
Logger.info("Deleting media and ignoring absent file.")
{:ok, media}
else
{:error, err}
end
{:ok, media} ->
{:ok, media}
end
else
Logger.debug("We cannot delete media file, it's still being used")
{:ok, media}
end
end
@spec can_delete_media_file?(Media.t()) :: boolean()
defp can_delete_media_file?(%Media{file: %File{url: url}}) do
Logger.debug("Checking for other uses of the media file, by comparing it's URL…")
case get_media_by_url(url) do
# No other media with this URL
nil ->
if url_is_also_a_profile_file?(url) do
Logger.debug("Found URL in actor profile, so we need to keep the file")
false
else
Logger.debug("All good, we can delete the media file")
true
end
%Media{} ->
Logger.debug(
"Found media different from this once for this URL, so there's at least one other media"
)
false
end
end
@spec delete_user_profile_media_by_url(String.t()) ::
{:ok, String.t() | :ignored} | {:error, atom()}
def delete_user_profile_media_by_url(url) do
if get_media_by_url(url) == nil && count_occurences_of_url_in_profiles(url) <= 1 do
# We have no media using this URL and only this profile is using this URL
Upload.remove(url)
else
{:ok, :ignored}
end
end
# Ecto doesn't currently allow us to use exists with a subquery,
# so we can't create the union through Ecto
# https://github.com/elixir-ecto/ecto/issues/3619
@union_query [
[from: "events", param: "picture_id"],
[from: "events_medias", param: "media_id"],
[from: "posts", param: "picture_id"],
[from: "posts_medias", param: "media_id"],
[from: "comments_medias", param: "media_id"]
]
|> Enum.map_join(" UNION ", fn [from: from, param: param] ->
"SELECT 1 FROM #{from} WHERE #{from}.#{param} = m0.id"
end)
|> (&"NOT EXISTS(#{&1})").()
@spec find_media_to_clean(Keyword.t()) :: list(list(Media.t()))
def find_media_to_clean(opts) do
default_grace_period =
Mobilizon.Config.get([:instance, :orphan_upload_grace_period_hours], 48)
grace_period = Keyword.get(opts, :grace_period, default_grace_period)
expiration_date = DateTime.add(DateTime.utc_now(), grace_period * -3600)
query =
from(m in Media,
as: :media,
distinct: true,
join: a in Actor,
on: a.id == m.actor_id,
where: is_nil(a.domain),
where: m.inserted_at < ^expiration_date,
where: fragment(@union_query)
)
query
|> Repo.all(timeout: :infinity)
|> Enum.filter(fn %Media{file: %File{url: url}} ->
!url_is_also_a_profile_file?(url) && is_all_media_orphan?(url, expiration_date)
end)
|> Enum.chunk_by(fn %Media{file: %File{url: url}} ->
url
|> String.split("?", parts: 2)
|> hd
end)
end
defp is_all_media_orphan?(url, expiration_date) do
url
|> get_all_media_by_url()
|> Enum.all?(&is_media_orphan?(&1, expiration_date))
end
@spec is_media_orphan?(Media.t(), DateTime.t()) :: boolean()
defp is_media_orphan?(%Media{id: media_id}, expiration_date) do
media_query =
from(m in Media,
as: :media,
distinct: true,
join: a in Actor,
on: a.id == m.actor_id,
where: m.id == ^media_id,
where: is_nil(a.domain),
where: m.inserted_at < ^expiration_date,
where: fragment(@union_query)
)
Repo.exists?(media_query)
end
@spec url_is_also_a_profile_file?(String.t()) :: boolean()
defp url_is_also_a_profile_file?(url) when is_binary(url) do
count_occurences_of_url_in_profiles(url) > 0
end
@spec count_occurences_of_url_in_profiles(String.t()) :: integer()
defp count_occurences_of_url_in_profiles(url) when is_binary(url) do
Actor
|> where([a], fragment("avatar->>'url'") == ^url or fragment("banner->>'url'") == ^url)
|> Repo.aggregate(:count)
end
@spec media_by_url_query(String.t()) :: Ecto.Query.t()
defp media_by_url_query(url) do
from(
p in Media,
where: split_part(fragment("file->>'url'"), "?", 1) == ^url
)
end
@spec medias_for_actor_query(integer() | String.t()) :: Ecto.Query.t()
defp medias_for_actor_query(actor_id) do
Media
|> join(:inner, [p], a in Actor, on: p.actor_id == a.id)
|> where([_p, a], a.id == ^actor_id)
end
@spec medias_for_user_query(integer() | String.t()) :: Ecto.Query.t()
defp medias_for_user_query(user_id) do
Media
|> join(:inner, [p], a in Actor, on: p.actor_id == a.id)
|> join(:inner, [_p, a], u in User, on: a.user_id == u.id)
|> where([_p, _a, u], u.id == ^user_id)
end
end