spc-pleroma/lib/pleroma/emoji/pack.ex

508 lines
14 KiB
Elixir

defmodule Pleroma.Emoji.Pack do
@derive {Jason.Encoder, only: [:files, :pack]}
defstruct files: %{},
pack_file: nil,
path: nil,
pack: %{},
name: nil
@type t() :: %__MODULE__{
files: %{String.t() => Path.t()},
pack_file: Path.t(),
path: Path.t(),
pack: map(),
name: String.t()
}
alias Pleroma.Emoji
@spec emoji_path() :: Path.t()
def emoji_path do
static = Pleroma.Config.get!([:instance, :static_dir])
Path.join(static, "emoji")
end
@spec create(String.t()) :: :ok | {:error, File.posix()} | {:error, :empty_values}
def create(name) when byte_size(name) > 0 do
dir = Path.join(emoji_path(), name)
with :ok <- File.mkdir(dir) do
%__MODULE__{
pack_file: Path.join(dir, "pack.json")
}
|> save_pack()
end
end
def create(_), do: {:error, :empty_values}
@spec show(String.t()) :: {:ok, t()} | {:loaded, nil} | {:error, :empty_values}
def show(name) when byte_size(name) > 0 do
with {_, %__MODULE__{} = pack} <- {:loaded, load_pack(name)},
{_, pack} <- validate_pack(pack) do
{:ok, pack}
end
end
def show(_), do: {:error, :empty_values}
@spec delete(String.t()) ::
{:ok, [binary()]} | {:error, File.posix(), binary()} | {:error, :empty_values}
def delete(name) when byte_size(name) > 0 do
emoji_path()
|> Path.join(name)
|> File.rm_rf()
end
def delete(_), do: {:error, :empty_values}
@spec add_file(String.t(), String.t(), Path.t(), Plug.Upload.t() | String.t()) ::
{:ok, t()} | {:error, File.posix()} | {:error, :empty_values}
def add_file(name, shortcode, filename, file)
when byte_size(name) > 0 and byte_size(shortcode) > 0 and byte_size(filename) > 0 do
with {_, nil} <- {:exists, Emoji.get(shortcode)},
{_, %__MODULE__{} = pack} <- {:loaded, load_pack(name)} do
file_path = Path.join(pack.path, filename)
create_subdirs(file_path)
case file do
%Plug.Upload{path: upload_path} ->
# Copy the uploaded file from the temporary directory
File.copy!(upload_path, file_path)
url when is_binary(url) ->
# Download and write the file
file_contents = Tesla.get!(url).body
File.write!(file_path, file_contents)
end
files = Map.put(pack.files, shortcode, filename)
updated_pack = %{pack | files: files}
case save_pack(updated_pack) do
:ok ->
Emoji.reload()
{:ok, updated_pack}
e ->
e
end
end
end
def add_file(_, _, _, _), do: {:error, :empty_values}
defp create_subdirs(file_path) do
if String.contains?(file_path, "/") do
file_path
|> Path.dirname()
|> File.mkdir_p!()
end
end
@spec delete_file(String.t(), String.t()) ::
{:ok, t()} | {:error, File.posix()} | {:error, :empty_values}
def delete_file(name, shortcode) when byte_size(name) > 0 and byte_size(shortcode) > 0 do
with {_, %__MODULE__{} = pack} <- {:loaded, load_pack(name)},
{_, {filename, files}} when not is_nil(filename) <-
{:exists, Map.pop(pack.files, shortcode)},
emoji <- Path.join(pack.path, filename),
{_, true} <- {:exists, File.exists?(emoji)} do
emoji_dir = Path.dirname(emoji)
File.rm!(emoji)
if String.contains?(filename, "/") and File.ls!(emoji_dir) == [] do
File.rmdir!(emoji_dir)
end
updated_pack = %{pack | files: files}
case save_pack(updated_pack) do
:ok ->
Emoji.reload()
{:ok, updated_pack}
e ->
e
end
end
end
def delete_file(_, _), do: {:error, :empty_values}
@spec update_file(String.t(), String.t(), String.t(), String.t(), boolean()) ::
{:ok, t()} | {:error, File.posix()} | {:error, :empty_values}
def update_file(name, shortcode, new_shortcode, new_filename, force)
when byte_size(name) > 0 and byte_size(shortcode) > 0 and byte_size(new_shortcode) > 0 and
byte_size(new_filename) > 0 do
with {_, %__MODULE__{} = pack} <- {:loaded, load_pack(name)},
{_, {filename, files}} when not is_nil(filename) <-
{:exists, Map.pop(pack.files, shortcode)},
{_, true} <- {:not_used, force or is_nil(Emoji.get(new_shortcode))} do
old_path = Path.join(pack.path, filename)
old_dir = Path.dirname(old_path)
new_path = Path.join(pack.path, new_filename)
create_subdirs(new_path)
:ok = File.rename(old_path, new_path)
if String.contains?(filename, "/") and File.ls!(old_dir) == [] do
File.rmdir!(old_dir)
end
files = Map.put(files, new_shortcode, new_filename)
updated_pack = %{pack | files: files}
case save_pack(updated_pack) do
:ok ->
Emoji.reload()
{:ok, updated_pack}
e ->
e
end
end
end
def update_file(_, _, _, _, _), do: {:error, :empty_values}
@spec import_from_filesystem() :: {:ok, [String.t()]} | {:error, 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.filter(& &1)
{:ok, names}
else
{:ok, %{access: _}} -> {:error, :no_read_write}
e -> e
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 -> 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
File.read!(txt_path)
|> 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)
file =
if String.ends_with?(path, file_dir_name) do
Path.basename(file)
else
file
end
{name, file}
_ ->
nil
end
end)
|> Enum.filter(& &1)
|> Enum.into(%{})
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
@spec list_remote(String.t()) :: {:ok, map()}
def list_remote(url) do
uri =
url
|> String.trim()
|> URI.parse()
with {_, true} <- {:shareable, shareable_packs_available?(uri)} do
packs =
uri
|> URI.merge("/api/pleroma/emoji/packs")
|> to_string()
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
{:ok, packs}
end
end
@spec list_local() :: {:ok, map()}
def list_local 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
packs =
results
|> Enum.map(&load_pack/1)
|> Enum.filter(& &1)
|> Enum.map(&validate_pack/1)
|> Map.new()
{:ok, packs}
end
end
defp validate_pack(pack) do
if downloadable?(pack) do
archive = fetch_archive(pack)
archive_sha = :crypto.hash(:sha256, archive) |> Base.encode16()
info =
pack.pack
|> Map.put("can-download", true)
|> Map.put("download-sha256", archive_sha)
{pack.name, Map.put(pack, :pack, info)}
else
info = Map.put(pack.pack, "can-download", false)
{pack.name, Map.put(pack, :pack, info)}
end
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} ->
File.exists?(Path.join(pack.path, file))
end)
end
@spec get_archive(String.t()) :: {:ok, binary()}
def get_archive(name) do
with {_, %__MODULE__{} = pack} <- {:exists?, load_pack(name)},
{_, true} <- {:can_download?, downloadable?(pack)} do
{:ok, fetch_archive(pack)}
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 create_archive_and_cache(pack, hash) do
files = ['pack.json' | Enum.map(pack.files, fn {_, file} -> to_charlist(file) end)]
{:ok, {_, result}} =
:zip.zip('#{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
@spec download(String.t(), String.t(), String.t()) :: :ok
def download(name, url, as) do
uri =
url
|> String.trim()
|> URI.parse()
with {_, true} <- {:shareable, shareable_packs_available?(uri)} do
remote_pack =
uri
|> URI.merge("/api/pleroma/emoji/packs/#{name}")
|> to_string()
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
result =
case remote_pack["pack"] do
%{"share-files" => true, "can-download" => true, "download-sha256" => sha} ->
{:ok,
%{
sha: sha,
url: URI.merge(uri, "/api/pleroma/emoji/packs/#{name}/archive") |> 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
with {:ok, %{sha: sha, url: url} = pinfo} <- result,
%{body: archive} <- Tesla.get!(url),
{_, true} <- {:checksum, Base.decode16!(sha) == :crypto.hash(:sha256, archive)} do
local_name = as || name
path = Path.join(emoji_path(), local_name)
pack = %__MODULE__{
name: local_name,
path: path,
files: remote_pack["files"],
pack_file: Path.join(path, "pack.json")
}
File.mkdir_p!(pack.path)
files = Enum.map(remote_pack["files"], fn {_, path} -> to_charlist(path) end)
# Fallback cannot contain a pack.json file
files = if pinfo[:fallback], do: files, else: ['pack.json' | files]
{:ok, _} = :zip.unzip(archive, cwd: to_charlist(pack.path), 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
save_pack(pack)
end
:ok
end
end
end
defp save_pack(pack), do: File.write(pack.pack_file, Jason.encode!(pack, pretty: true))
@spec save_metadata(map(), t()) :: {:ok, t()} | {:error, File.posix()}
def save_metadata(metadata, %__MODULE__{} = pack) do
pack = Map.put(pack, :pack, metadata)
with :ok <- save_pack(pack) do
{:ok, pack}
end
end
@spec update_metadata(String.t(), map()) :: {:ok, t()} | {:error, File.posix()}
def update_metadata(name, data) do
pack = load_pack(name)
fb_sha_changed? =
not is_nil(data["fallback-src"]) and data["fallback-src"] != pack.pack["fallback-src"]
with {_, true} <- {:update?, fb_sha_changed?},
{:ok, %{body: zip}} <- Tesla.get(data["fallback-src"]),
{:ok, f_list} <- :zip.unzip(zip, [:memory]),
{_, true} <- {:has_all_files?, has_all_files?(pack.files, f_list)} do
fallback_sha = :crypto.hash(:sha256, zip) |> Base.encode16()
data
|> Map.put("fallback-src-sha256", fallback_sha)
|> save_metadata(pack)
else
{:update?, _} -> save_metadata(data, pack)
e -> e
end
end
# Check if all files from the pack.json are in the archive
defp has_all_files?(files, f_list) do
Enum.all?(files, fn {_, from_manifest} ->
List.keyfind(f_list, to_charlist(from_manifest), 0)
end)
end
@spec load_pack(String.t()) :: t() | nil
def load_pack(name) do
pack_file = Path.join([emoji_path(), name, "pack.json"])
if File.exists?(pack_file) do
pack_file
|> File.read!()
|> from_json()
|> Map.put(:pack_file, pack_file)
|> Map.put(:path, Path.dirname(pack_file))
|> Map.put(:name, name)
end
end
defp from_json(json) do
map = Jason.decode!(json)
struct(__MODULE__, %{files: map["files"], pack: map["pack"]})
end
defp shareable_packs_available?(uri) do
uri
|> URI.merge("/.well-known/nodeinfo")
|> to_string()
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
|> Map.get("links")
|> List.last()
|> Map.get("href")
# Get the actual nodeinfo address and fetch it
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
|> get_in(["metadata", "features"])
|> Enum.member?("shareable_emoji_packs")
end
end