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Improve handling of media file deletion

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Signed-off-by: Thomas Citharel <tcit@tcit.fr>
This commit is contained in:
Thomas Citharel 2021-12-15 12:58:31 +01:00
parent c174e18b39
commit ba097c736e
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7 changed files with 212 additions and 101 deletions
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4
lib/mobilizon/actors/actors.ex
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@ -14,11 +14,11 @@ defmodule Mobilizon.Actors do
alias Mobilizon.Addresses.Address
alias Mobilizon.Crypto
alias Mobilizon.Events.FeedToken
alias Mobilizon.Medias
alias Mobilizon.Service.Workers
alias Mobilizon.Storage.{Page, Repo}
alias Mobilizon.Users
alias Mobilizon.Users.User
alias Mobilizon.Web.Upload
require Logger
@ -1263,7 +1263,7 @@ defmodule Mobilizon.Actors do
with %Ecto.Changeset{changes: %{url: new_url}} <- changes[key],
%{url: old_url} <- data |> Map.from_struct() |> Map.get(key),
false <- new_url == old_url do
Upload.remove(old_url)
Medias.delete_user_profile_media_by_url(old_url)
end
end
end)

152
lib/mobilizon/medias/medias.ex
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@ -107,19 +107,8 @@ defmodule Mobilizon.Medias do
transaction =
Multi.new()
|> Multi.delete(:media, media)
|> Multi.run(:remove, fn _repo, %{media: %Media{file: %File{url: url}} = media} ->
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
|> Multi.run(:remove, fn _repo, %{media: %Media{} = media} ->
delete_file_from_media(media, opts)
end)
|> Repo.transaction()
@ -132,6 +121,143 @@ defmodule Mobilizon.Medias do
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(

5
lib/service/actor_suspension.ex
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@ -4,7 +4,7 @@ defmodule Mobilizon.Service.ActorSuspension do
"""
alias Ecto.Multi
alias Mobilizon.{Actors, Events, Users}
alias Mobilizon.{Actors, Events, Medias, Users}
alias Mobilizon.Actors.{Actor, Member}
alias Mobilizon.Discussions.{Comment, Discussion}
alias Mobilizon.Events.{Event, Participant}
@ -15,7 +15,6 @@ defmodule Mobilizon.Service.ActorSuspension do
alias Mobilizon.Users.User
alias Mobilizon.Web.Email.Actor, as: ActorEmail
alias Mobilizon.Web.Email.Group
alias Mobilizon.Web.Upload
require Logger
import Ecto.Query
@ -249,7 +248,7 @@ defmodule Mobilizon.Service.ActorSuspension do
@spec safe_remove_file(String.t(), Actor.t()) :: {:ok, Actor.t()}
defp safe_remove_file(url, %Actor{} = actor) do
case Upload.remove(url) do
case Medias.delete_user_profile_media_by_url(url) do
{:ok, _value} ->
{:ok, actor}

82
lib/service/clean_orphan_media.ex
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@ -3,12 +3,8 @@ defmodule Mobilizon.Service.CleanOrphanMedia do
Service to clean orphan media
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Medias
alias Mobilizon.Medias.File
alias Mobilizon.Medias.Media
alias Mobilizon.Storage.Repo
import Ecto.Query
@doc """
Clean orphan media
@ -21,7 +17,7 @@ defmodule Mobilizon.Service.CleanOrphanMedia do
"""
@spec clean(Keyword.t()) :: {:ok, list(Media.t())}
def clean(opts \\ []) do
medias = find_media(opts)
medias = Medias.find_media_to_clean(opts)
if Keyword.get(opts, :dry_run, false) do
{:ok, medias}
@ -35,80 +31,4 @@ defmodule Mobilizon.Service.CleanOrphanMedia do
{:ok, medias}
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(Keyword.t()) :: list(list(Media.t()))
defp find_media(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
def is_all_media_orphan?(url, expiration_date) do
url
|> Medias.get_all_media_by_url()
|> Enum.all?(&is_media_orphan?(&1, expiration_date))
end
@spec is_media_orphan?(Media.t(), DateTime.t()) :: boolean()
def 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()) :: nil
defp url_is_also_a_profile_file?(url) when is_binary(url) do
Actor
|> where([a], fragment("avatar->>'url'") == ^url or fragment("banner->>'url'") == ^url)
|> Repo.exists?()
end
end

1
mix.exs
View File

@ -256,6 +256,7 @@ defmodule Mobilizon.Mixfile do
end
defp run_test(args) do
File.mkdir("test/uploads")
Mix.Task.run("test", args)
File.rm_rf!("test/uploads")
end

2
test/federation/activity_pub/transmogrifier/comments_test.exs
View File

@ -215,7 +215,7 @@ defmodule Mobilizon.Federation.ActivityPub.Transmogrifier.CommentsTest do
assert capture_log([level: :warn], fn ->
{:ok, _returned_activity, _entity} = Transmogrifier.handle_incoming(data)
end) =~ "[warn] Parent object is something we don't handle"
end) =~ "[warning] Parent object is something we don't handle"
end
test "it ignores incoming private notes" do

67
test/mobilizon/media/media_test.exs
View File

@ -4,6 +4,7 @@ defmodule Mobilizon.MediaTest do
import Mobilizon.Factory
alias Mobilizon.{Config, Medias}
alias Mobilizon.Medias.Media
alias Mobilizon.Web.Upload.Uploader
@ -29,8 +30,16 @@ defmodule Mobilizon.MediaTest do
assert media.file.name == "something old"
end
end
test "delete_media/1 deletes the media" do
describe "delete_media/1" do
setup do
File.rm_rf!(Config.get!([Uploader.Local, :uploads]))
File.mkdir(Config.get!([Uploader.Local, :uploads]))
:ok
end
test "deletes the media" do
media = insert(:media)
%URI{path: "/media/" <> path} = URI.parse(media.file.url)
@ -48,5 +57,61 @@ defmodule Mobilizon.MediaTest do
"/" <> path
)
end
test "doesn't delete the media if two media entities are using the same URL" do
Config.put([Mobilizon.Web.Upload, :filters], [
Mobilizon.Web.Upload.Filter.Dedupe
])
media1 = insert(:media)
media2 = insert(:media)
assert media1.file.url == media2.file.url
%URI{path: "/media/" <> path} = URI.parse(media1.file.url)
assert File.exists?(
Config.get!([Uploader.Local, :uploads]) <>
"/" <> path
)
assert {:ok, %Media{}} = Medias.delete_media(media1)
assert_raise Ecto.NoResultsError, fn -> Medias.get_media!(media1.id) end
assert File.exists?(
Config.get!([Uploader.Local, :uploads]) <>
"/" <> path
)
Config.put([Mobilizon.Web.Upload, :filters], [])
end
test "doesn't delete the media if the same file is being used in a profile" do
Config.put([Mobilizon.Web.Upload, :filters], [
Mobilizon.Web.Upload.Filter.Dedupe
])
actor = insert(:actor)
media = insert(:media)
assert media.file.url == actor.avatar.url
%URI{path: "/media/" <> path} = URI.parse(media.file.url)
assert File.exists?(
Config.get!([Uploader.Local, :uploads]) <>
"/" <> path
)
assert {:ok, %Media{}} = Medias.delete_media(media)
assert_raise Ecto.NoResultsError, fn -> Medias.get_media!(media.id) end
assert File.exists?(
Config.get!([Uploader.Local, :uploads]) <>
"/" <> path
)
Config.put([Mobilizon.Web.Upload, :filters], [])
end
end
end