akkoma/lib/pleroma/web/emoji_api/emoji_api_controller.ex

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defmodule Pleroma.Web.EmojiAPI.EmojiAPIController do
use Pleroma.Web, :controller
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require Logger
def reload(conn, _params) do
Pleroma.Emoji.reload()
conn |> text("ok")
end
@emoji_dir_path Path.join(
Pleroma.Config.get!([:instance, :static_dir]),
"emoji"
)
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@cache_seconds_per_file Pleroma.Config.get!([:emoji, :shared_pack_cache_seconds_per_file])
def list_packs(conn, _params) do
pack_infos =
case File.ls(@emoji_dir_path) do
{:error, _} ->
%{}
{:ok, results} ->
results
|> Enum.filter(fn file ->
dir_path = Path.join(@emoji_dir_path, file)
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# Filter to only use the pack.json packs
File.dir?(dir_path) and File.exists?(Path.join(dir_path, "pack.json"))
end)
|> Enum.map(fn pack_name ->
pack_path = Path.join(@emoji_dir_path, pack_name)
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pack_file = Path.join(pack_path, "pack.json")
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{pack_name, Jason.decode!(File.read!(pack_file))}
end)
# Transform into a map of pack-name => pack-data
# Check if all the files are in place and can be sent
|> Enum.map(fn {name, pack} ->
pack_path = Path.join(@emoji_dir_path, name)
if can_download?(pack, pack_path) do
archive_for_sha = make_archive(name, pack, pack_path)
archive_sha = :crypto.hash(:sha256, archive_for_sha) |> Base.encode16()
{name,
pack
|> put_in(["pack", "can-download"], true)
|> put_in(["pack", "download-sha256"], archive_sha)}
else
{name,
pack
|> put_in(["pack", "can-download"], false)}
end
end)
|> Enum.into(%{})
end
conn |> json(pack_infos)
end
defp can_download?(pack, pack_path) do
# If the pack is set as shared, check if it can be downloaded
# That means that when asked, the pack can be packed and sent to the remote
# Otherwise, they'd have to download it from external-src
pack["pack"]["share-files"] and
Enum.all?(pack["files"], fn {_, path} ->
File.exists?(Path.join(pack_path, path))
end)
end
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defp create_archive_and_cache(name, pack, pack_dir, md5) do
files =
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['pack.json'] ++
(pack["files"] |> Enum.map(fn {_, path} -> to_charlist(path) end))
{:ok, {_, zip_result}} = :zip.zip('#{name}.zip', files, [:memory, cwd: to_charlist(pack_dir)])
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cache_ms = :timer.seconds(@cache_seconds_per_file * Enum.count(files))
Cachex.put!(
:emoji_packs_cache,
name,
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# if pack.json MD5 changes, the cache is not valid anymore
%{pack_json_md5: md5, pack_data: zip_result},
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# Add a minute to cache time for every file in the pack
ttl: cache_ms
)
Logger.debug("Create an archive for the '#{name}' emoji pack, \
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keeping it in cache for #{div(cache_ms, 1000)}s")
zip_result
end
defp make_archive(name, pack, pack_dir) do
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# Having a different pack.json md5 invalidates cache
pack_file_md5 = :crypto.hash(:md5, File.read!(Path.join(pack_dir, "pack.json")))
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maybe_cached_pack = Cachex.get!(:emoji_packs_cache, name)
zip_result =
if is_nil(maybe_cached_pack) do
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create_archive_and_cache(name, pack, pack_dir, pack_file_md5)
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else
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if maybe_cached_pack[:pack_file_md5] == pack_file_md5 do
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Logger.debug("Using cache for the '#{name}' shared emoji pack")
maybe_cached_pack[:pack_data]
else
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create_archive_and_cache(name, pack, pack_dir, pack_file_md5)
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end
end
zip_result
end
def download_shared(conn, %{"name" => name}) do
pack_dir = Path.join(@emoji_dir_path, name)
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pack_file = Path.join(pack_dir, "pack.json")
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if File.exists?(pack_file) do
pack = Jason.decode!(File.read!(pack_file))
if can_download?(pack, pack_dir) do
zip_result = make_archive(name, pack, pack_dir)
conn
|> send_download({:binary, zip_result}, filename: "#{name}.zip")
else
{:error,
conn
|> put_status(:forbidden)
|> text("Pack #{name} cannot be downloaded from this instance, either pack sharing\
was disabled for this pack or some files are missing")}
end
else
{:error,
conn
|> put_status(:not_found)
|> text("Pack #{name} does not exist")}
end
end
def download_from(conn, %{"instance_address" => address, "pack_name" => name} = data) do
list_uri = "#{address}/api/pleroma/emoji/packs/list"
list = Tesla.get!(list_uri).body |> Jason.decode!()
full_pack = list[name]
pfiles = full_pack["files"]
pack = full_pack["pack"]
pack_info_res =
cond do
pack["share-files"] && pack["can-download"] ->
{:ok,
%{
sha: pack["download-sha256"],
uri: "#{address}/api/pleroma/emoji/packs/download_shared/#{name}"
}}
pack["fallback-src"] ->
{:ok,
%{
sha: pack["fallback-src-sha256"],
uri: pack["fallback-src"],
fallback: true
}}
true ->
{:error, "The pack was not set as shared and there is no fallback src to download from"}
end
case pack_info_res do
{:ok, %{sha: sha, uri: uri} = pinfo} ->
sha = Base.decode16!(sha)
emoji_archive = Tesla.get!(uri).body
got_sha = :crypto.hash(:sha256, emoji_archive)
if got_sha == sha do
local_name = data["as"] || name
pack_dir = Path.join(@emoji_dir_path, local_name)
File.mkdir_p!(pack_dir)
# Fallback cannot contain a pack.json file
files =
unless(pinfo[:fallback], do: ['pack.json'], else: []) ++
(pfiles |> Enum.map(fn {_, path} -> to_charlist(path) end))
{:ok, _} = :zip.unzip(emoji_archive, cwd: to_charlist(pack_dir), file_list: files)
# Fallback can't contain a pack.json file, since that would cause the fallback-src-sha256
# in it to depend on itself
if pinfo[:fallback] do
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pack_file_path = Path.join(pack_dir, "pack.json")
File.write!(pack_file_path, Jason.encode!(full_pack))
end
conn |> text("ok")
else
conn
|> put_status(:internal_server_error)
|> text("SHA256 for the pack doesn't match the one sent by the server")
end
{:error, e} ->
conn |> put_status(:internal_server_error) |> text(e)
end
end
def delete(conn, %{"name" => name}) do
pack_dir = Path.join(@emoji_dir_path, name)
case File.rm_rf(pack_dir) do
{:ok, _} ->
conn |> text("ok")
{:error, _} ->
conn |> put_status(:internal_server_error) |> text("Couldn't delete the pack #{name}")
end
end
end