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