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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Emoji.Pack do
@derive {Jason.Encoder, only: [:files, :pack, :files_count]}
defstruct files: %{},
files_count: 0,
pack_file: nil,
path: nil,
pack: %{},
name: nil
@type t() :: %__MODULE__{
files: %{String.t() => Path.t()},
files_count: non_neg_integer(),
pack_file: Path.t(),
path: Path.t(),
pack: map(),
name: String.t()
}
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
alias Pleroma.Emoji
alias Pleroma.Emoji.Pack
alias Pleroma.Utils
@spec create(String.t()) :: {:ok, t()} | {:error, File.posix()} | {:error, :empty_values}
def create(name) do
with :ok <- validate_not_empty([name]),
dir <- Path.join(emoji_path(), name),
:ok <- File.mkdir(dir) do
save_pack(%__MODULE__{pack_file: Path.join(dir, "pack.json")})
end
end
defp paginate(entities, 1, page_size), do: Enum.take(entities, page_size)
defp paginate(entities, page, page_size) do
entities
|> Enum.chunk_every(page_size)
|> Enum.at(page - 1)
end
@spec show(keyword()) :: {:ok, t()} | {:error, atom()}
def show(opts) do
name = opts[:name]
with :ok <- validate_not_empty([name]),
{:ok, pack} <- load_pack(name) do
shortcodes =
pack.files
|> Map.keys()
|> Enum.sort()
|> paginate(opts[:page], opts[:page_size])
pack = Map.put(pack, :files, Map.take(pack.files, shortcodes))
{:ok, validate_pack(pack)}
end
end
@spec delete(String.t()) ::
{:ok, [binary()]} | {:error, File.posix(), binary()} | {:error, :empty_values}
def delete(name) do
with :ok <- validate_not_empty([name]),
pack_path <- Path.join(emoji_path(), name) do
File.rm_rf(pack_path)
end
end
@spec unpack_zip_emojies(list(tuple())) :: list(map())
defp unpack_zip_emojies(zip_files) do
Enum.reduce(zip_files, [], fn
{_, path, s, _, _, _}, acc when elem(s, 2) == :regular ->
with(
filename <- Path.basename(path),
shortcode <- Path.basename(filename, Path.extname(filename)),
false <- Emoji.exist?(shortcode)
) do
[%{path: path, filename: path, shortcode: shortcode} | acc]
else
_ -> acc
end
_, acc ->
acc
end)
end
@spec add_file(t(), String.t(), Path.t(), Plug.Upload.t()) ::
{:ok, t()}
| {:error, File.posix() | atom()}
def add_file(%Pack{} = pack, _, _, %Plug.Upload{content_type: "application/zip"} = file) do
with {:ok, zip_files} <- :zip.table(to_charlist(file.path)),
[_ | _] = emojies <- unpack_zip_emojies(zip_files),
{:ok, tmp_dir} <- Utils.tmp_dir("emoji") do
try do
{:ok, _emoji_files} =
:zip.unzip(
to_charlist(file.path),
[{:file_list, Enum.map(emojies, & &1[:path])}, {:cwd, String.to_charlist(tmp_dir)}]
)
{_, updated_pack} =
Enum.map_reduce(emojies, pack, fn item, emoji_pack ->
emoji_file = %Plug.Upload{
filename: item[:filename],
path: Path.join(tmp_dir, item[:path])
}
{:ok, updated_pack} =
do_add_file(
emoji_pack,
item[:shortcode],
to_string(item[:filename]),
emoji_file
)
{item, updated_pack}
end)
Emoji.reload()
{:ok, updated_pack}
after
File.rm_rf(tmp_dir)
end
else
{:error, _} = error ->
error
_ ->
{:ok, pack}
end
end
def add_file(%Pack{} = pack, shortcode, filename, %Plug.Upload{} = file) do
with :ok <- validate_not_empty([shortcode, filename]),
:ok <- validate_emoji_not_exists(shortcode),
{:ok, updated_pack} <- do_add_file(pack, shortcode, filename, file) do
Emoji.reload()
{:ok, updated_pack}
end
end
defp do_add_file(pack, shortcode, filename, file) do
with :ok <- save_file(file, pack, filename) do
pack
|> put_emoji(shortcode, filename)
|> save_pack()
end
end
@spec delete_file(t(), String.t()) ::
{:ok, t()} | {:error, File.posix() | atom()}
def delete_file(%Pack{} = pack, shortcode) do
with :ok <- validate_not_empty([shortcode]),
:ok <- remove_file(pack, shortcode),
{:ok, updated_pack} <- pack |> delete_emoji(shortcode) |> save_pack() do
Emoji.reload()
{:ok, updated_pack}
end
end
@spec update_file(t(), String.t(), String.t(), String.t(), boolean()) ::
{:ok, t()} | {:error, File.posix() | atom()}
def update_file(%Pack{} = pack, shortcode, new_shortcode, new_filename, force) do
with :ok <- validate_not_empty([shortcode, new_shortcode, new_filename]),
{:ok, filename} <- get_filename(pack, shortcode),
:ok <- validate_emoji_not_exists(new_shortcode, force),
:ok <- rename_file(pack, filename, new_filename),
{:ok, updated_pack} <-
pack
|> delete_emoji(shortcode)
|> put_emoji(new_shortcode, new_filename)
|> save_pack() do
Emoji.reload()
{:ok, updated_pack}
end
end
@spec import_from_filesystem() :: {:ok, [String.t()]} | {:error, File.posix() | atom()}
def import_from_filesystem do
emoji_path = emoji_path()
with {:ok, %{access: :read_write}} <- File.stat(emoji_path),
{:ok, results} <- File.ls(emoji_path) do
names =
results
|> Enum.map(&Path.join(emoji_path, &1))
|> Enum.reject(fn path ->
File.dir?(path) and File.exists?(Path.join(path, "pack.json"))
end)
|> Enum.map(&write_pack_contents/1)
|> Enum.reject(&is_nil/1)
{:ok, names}
else
{:ok, %{access: _}} -> {:error, :no_read_write}
e -> e
end
end
@spec list_remote(keyword()) :: {:ok, map()} | {:error, atom()}
def list_remote(opts) do
uri = opts[:url] |> String.trim() |> URI.parse()
with :ok <- validate_shareable_packs_available(uri) do
uri
|> URI.merge(
"/api/v1/pleroma/emoji/packs?page=#{opts[:page]}&page_size=#{opts[:page_size]}"
)
|> http_get()
end
end
@spec list_local(keyword()) :: {:ok, map(), non_neg_integer()}
def list_local(opts) do
with {:ok, results} <- list_packs_dir() do
all_packs =
results
|> Enum.map(fn name ->
case load_pack(name) do
{:ok, pack} -> pack
_ -> nil
end
end)
|> Enum.reject(&is_nil/1)
packs =
all_packs
|> paginate(opts[:page], opts[:page_size])
|> Map.new(fn pack -> {pack.name, validate_pack(pack)} end)
{:ok, packs, length(all_packs)}
end
end
@spec get_archive(String.t()) :: {:ok, binary()} | {:error, atom()}
def get_archive(name) do
with {:ok, pack} <- load_pack(name),
:ok <- validate_downloadable(pack) do
{:ok, fetch_archive(pack)}
end
end
@spec download(String.t(), String.t(), String.t()) :: {:ok, t()} | {:error, atom()}
def download(name, url, as) do
uri = url |> String.trim() |> URI.parse()
with :ok <- validate_shareable_packs_available(uri),
{:ok, %{"files_count" => files_count}} <-
uri |> URI.merge("/api/v1/pleroma/emoji/pack?name=#{name}&page_size=0") |> http_get(),
{:ok, remote_pack} <-
uri
|> URI.merge("/api/v1/pleroma/emoji/pack?name=#{name}&page_size=#{files_count}")
|> http_get(),
{:ok, %{sha: sha, url: url} = pack_info} <- fetch_pack_info(remote_pack, uri, name),
{:ok, archive} <- download_archive(url, sha),
pack <- copy_as(remote_pack, as || name),
{:ok, _} = unzip(archive, pack_info, remote_pack, pack) do
# Fallback can't contain a pack.json file, since that would cause the fallback-src-sha256
# in it to depend on itself
if pack_info[:fallback] do
save_pack(pack)
else
{:ok, pack}
end
end
end
@spec save_metadata(map(), t()) :: {:ok, t()} | {:error, File.posix()}
def save_metadata(metadata, %__MODULE__{} = pack) do
pack
|> Map.put(:pack, metadata)
|> save_pack()
end
@spec update_metadata(String.t(), map()) :: {:ok, t()} | {:error, File.posix()}
def update_metadata(name, data) do
with {:ok, pack} <- load_pack(name) do
if fallback_sha_changed?(pack, data) do
update_sha_and_save_metadata(pack, data)
else
save_metadata(data, pack)
end
end
end
@spec load_pack(String.t()) :: {:ok, t()} | {:error, :file.posix()}
def load_pack(name) do
name = Path.basename(name)
pack_file = Path.join([emoji_path(), name, "pack.json"])
with {:ok, _} <- File.stat(pack_file),
{:ok, pack_data} <- File.read(pack_file) do
pack =
from_json(
pack_data,
%{
pack_file: pack_file,
path: Path.dirname(pack_file),
name: name
}
)
files_count =
pack.files
|> Map.keys()
|> length()
{:ok, Map.put(pack, :files_count, files_count)}
end
end
@spec emoji_path() :: Path.t()
defp emoji_path do
[:instance, :static_dir]
|> Pleroma.Config.get!()
|> Path.join("emoji")
end
defp validate_emoji_not_exists(shortcode, force \\ false)
defp validate_emoji_not_exists(_shortcode, true), do: :ok
defp validate_emoji_not_exists(shortcode, _) do
if Emoji.exist?(shortcode) do
{:error, :already_exists}
else
:ok
end
end
defp write_pack_contents(path) do
pack = %__MODULE__{
files: files_from_path(path),
path: path,
pack_file: Path.join(path, "pack.json")
}
case save_pack(pack) do
{:ok, _pack} -> Path.basename(path)
_ -> nil
end
end
defp files_from_path(path) do
txt_path = Path.join(path, "emoji.txt")
if File.exists?(txt_path) do
# There's an emoji.txt file, it's likely from a pack installed by the pack manager.
# Make a pack.json file from the contents of that emoji.txt file
# FIXME: Copy-pasted from Pleroma.Emoji/load_from_file_stream/2
# Create a map of shortcodes to filenames from emoji.txt
txt_path
|> File.read!()
|> String.split("\n")
|> Enum.map(&String.trim/1)
|> Enum.map(fn line ->
case String.split(line, ~r/,\s*/) do
# This matches both strings with and without tags
# and we don't care about tags here
[name, file | _] ->
file_dir_name = Path.dirname(file)
if String.ends_with?(path, file_dir_name) do
{name, Path.basename(file)}
else
{name, file}
end
_ ->
nil
end
end)
|> Enum.reject(&is_nil/1)
|> Map.new()
else
# If there's no emoji.txt, assume all files
# that are of certain extensions from the config are emojis and import them all
pack_extensions = Pleroma.Config.get!([:emoji, :pack_extensions])
Emoji.Loader.make_shortcode_to_file_map(path, pack_extensions)
end
end
defp validate_pack(pack) do
info =
if downloadable?(pack) do
archive = fetch_archive(pack)
archive_sha = :crypto.hash(:sha256, archive) |> Base.encode16()
pack.pack
|> Map.put("can-download", true)
|> Map.put("download-sha256", archive_sha)
else
Map.put(pack.pack, "can-download", false)
end
Map.put(pack, :pack, info)
end
defp downloadable?(pack) 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"] &&
Enum.all?(pack.files, fn {_, file} ->
pack.path
|> Path.join(file)
|> File.exists?()
end)
end
defp create_archive_and_cache(pack, hash) do
files = [~c"pack.json" | Enum.map(pack.files, fn {_, file} -> to_charlist(file) end)]
{:ok, {_, result}} =
:zip.zip(~c"#{pack.name}.zip", files, [:memory, cwd: to_charlist(pack.path)])
ttl_per_file = Pleroma.Config.get!([:emoji, :shared_pack_cache_seconds_per_file])
overall_ttl = :timer.seconds(ttl_per_file * Enum.count(files))
@cachex.put(
:emoji_packs_cache,
pack.name,
# if pack.json MD5 changes, the cache is not valid anymore
%{hash: hash, pack_data: result},
# Add a minute to cache time for every file in the pack
ttl: overall_ttl
)
result
end
defp save_pack(pack) do
with {:ok, json} <- Jason.encode(pack, pretty: true),
:ok <- File.write(pack.pack_file, json) do
{:ok, pack}
end
end
defp from_json(json, attrs) do
map = Jason.decode!(json)
pack_attrs =
attrs
|> Map.merge(%{
files: map["files"],
pack: map["pack"]
})
struct(__MODULE__, pack_attrs)
end
defp validate_shareable_packs_available(uri) do
with {:ok, %{"links" => links}} <- uri |> URI.merge("/.well-known/nodeinfo") |> http_get(),
# Get the actual nodeinfo address and fetch it
{:ok, %{"metadata" => %{"features" => features}}} <-
links |> List.last() |> Map.get("href") |> http_get() do
if Enum.member?(features, "shareable_emoji_packs") do
:ok
else
{:error, :not_shareable}
end
end
end
defp validate_not_empty(list) do
if Enum.all?(list, fn i -> is_binary(i) and i != "" end) do
:ok
else
{:error, :empty_values}
end
end
defp save_file(%Plug.Upload{path: upload_path}, pack, filename) do
file_path = Path.join(pack.path, filename)
create_subdirs(file_path)
with {:ok, _} <- File.copy(upload_path, file_path) do
:ok
end
end
defp put_emoji(pack, shortcode, filename) do
files = Map.put(pack.files, shortcode, filename)
%{pack | files: files, files_count: length(Map.keys(files))}
end
defp delete_emoji(pack, shortcode) do
files = Map.delete(pack.files, shortcode)
%{pack | files: files}
end
defp rename_file(pack, filename, new_filename) do
old_path = Path.join(pack.path, filename)
new_path = Path.join(pack.path, new_filename)
create_subdirs(new_path)
with :ok <- File.rename(old_path, new_path) do
remove_dir_if_empty(old_path, filename)
end
end
defp create_subdirs(file_path) do
with true <- String.contains?(file_path, "/"),
path <- Path.dirname(file_path),
false <- File.exists?(path) do
File.mkdir_p!(path)
end
end
defp remove_file(pack, shortcode) do
with {:ok, filename} <- get_filename(pack, shortcode),
emoji <- Path.join(pack.path, filename),
:ok <- File.rm(emoji) do
remove_dir_if_empty(emoji, filename)
end
end
defp remove_dir_if_empty(emoji, filename) do
dir = Path.dirname(emoji)
if String.contains?(filename, "/") and File.ls!(dir) == [] do
File.rmdir!(dir)
else
:ok
end
end
defp get_filename(pack, shortcode) do
with %{^shortcode => filename} when is_binary(filename) <- pack.files,
file_path <- Path.join(pack.path, filename),
{:ok, _} <- File.stat(file_path) do
{:ok, filename}
else
{:error, _} = error ->
error
_ ->
{:error, :doesnt_exist}
end
end
defp http_get(%URI{} = url), do: url |> to_string() |> http_get()
defp http_get(url) do
with {:ok, %{body: body}} <- Pleroma.HTTP.get(url, [], pool: :default) do
Jason.decode(body)
end
end
defp list_packs_dir do
emoji_path = emoji_path()
# Create the directory first if it does not exist. This is probably the first request made
# with the API so it should be sufficient
with {:create_dir, :ok} <- {:create_dir, File.mkdir_p(emoji_path)},
{:ls, {:ok, results}} <- {:ls, File.ls(emoji_path)} do
{:ok, Enum.sort(results)}
else
{:create_dir, {:error, e}} -> {:error, :create_dir, e}
{:ls, {:error, e}} -> {:error, :ls, e}
end
end
defp validate_downloadable(pack) do
if downloadable?(pack), do: :ok, else: {:error, :cant_download}
end
defp copy_as(remote_pack, local_name) do
path = Path.join(emoji_path(), local_name)
%__MODULE__{
name: local_name,
path: path,
files: remote_pack["files"],
pack_file: Path.join(path, "pack.json")
}
end
defp unzip(archive, pack_info, remote_pack, local_pack) do
with :ok <- File.mkdir_p!(local_pack.path) do
files = Enum.map(remote_pack["files"], fn {_, path} -> to_charlist(path) end)
# Fallback cannot contain a pack.json file
files = if pack_info[:fallback], do: files, else: [~c"pack.json" | files]
:zip.unzip(archive, cwd: to_charlist(local_pack.path), file_list: files)
end
end
defp fetch_pack_info(remote_pack, uri, name) do
case remote_pack["pack"] do
%{"share-files" => true, "can-download" => true, "download-sha256" => sha} ->
{:ok,
%{
sha: sha,
url: URI.merge(uri, "/api/v1/pleroma/emoji/packs/archive?name=#{name}") |> to_string()
}}
%{"fallback-src" => src, "fallback-src-sha256" => sha} when is_binary(src) ->
{:ok,
%{
sha: sha,
url: src,
fallback: true
}}
_ ->
{:error, "The pack was not set as shared and there is no fallback src to download from"}
end
end
defp download_archive(url, sha) do
with {:ok, %{body: archive}} <- Pleroma.HTTP.get(url) do
if Base.decode16!(sha) == :crypto.hash(:sha256, archive) do
{:ok, archive}
else
{:error, :invalid_checksum}
end
end
end
defp fetch_archive(pack) do
hash = :crypto.hash(:md5, File.read!(pack.pack_file))
case @cachex.get!(:emoji_packs_cache, pack.name) do
%{hash: ^hash, pack_data: archive} -> archive
_ -> create_archive_and_cache(pack, hash)
end
end
defp fallback_sha_changed?(pack, data) do
is_binary(data[:"fallback-src"]) and data[:"fallback-src"] != pack.pack["fallback-src"]
end
defp update_sha_and_save_metadata(pack, data) do
with {:ok, %{body: zip}} <- Pleroma.HTTP.get(data[:"fallback-src"]),
:ok <- validate_has_all_files(pack, zip) do
fallback_sha = :sha256 |> :crypto.hash(zip) |> Base.encode16()
data
|> Map.put("fallback-src-sha256", fallback_sha)
|> save_metadata(pack)
end
end
defp validate_has_all_files(pack, zip) do
with {:ok, f_list} <- :zip.unzip(zip, [:memory]) do
# Check if all files from the pack.json are in the archive
pack.files
|> Enum.all?(fn {_, from_manifest} ->
List.keyfind(f_list, to_charlist(from_manifest), 0)
end)
|> if(do: :ok, else: {:error, :incomplete})
end
end
end

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