distraction.party/lib/pleroma/web/pleroma_api/controllers/emoji_api_controller.ex

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defmodule Pleroma.Web.PleromaAPI.EmojiAPIController do
use Pleroma.Web, :controller
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require Logger
@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])
@doc """
Lists the packs available on the instance as JSON.
The information is public and does not require authentification. The format is
a map of "pack directory name" to pack.json contents.
"""
def list_packs(conn, _params) do
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with {:ok, results} <- File.ls(@emoji_dir_path) do
pack_infos =
results
|> Enum.filter(&has_pack_json?/1)
|> Enum.map(&load_pack/1)
# Check if all the files are in place and can be sent
|> Enum.map(&validate_pack/1)
# Transform into a map of pack-name => pack-data
|> Enum.into(%{})
json(conn, pack_infos)
end
end
defp has_pack_json?(file) do
dir_path = Path.join(@emoji_dir_path, file)
# Filter to only use the pack.json packs
File.dir?(dir_path) and File.exists?(Path.join(dir_path, "pack.json"))
end
defp load_pack(pack_name) do
pack_path = Path.join(@emoji_dir_path, pack_name)
pack_file = Path.join(pack_path, "pack.json")
{pack_name, Jason.decode!(File.read!(pack_file))}
end
defp validate_pack({name, pack}) do
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()
pack =
pack
|> put_in(["pack", "can-download"], true)
|> put_in(["pack", "download-sha256"], archive_sha)
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{name, pack}
else
{name, put_in(pack, ["pack", "can-download"], false)}
end
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"] &&
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("Created 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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case Cachex.get!(:emoji_packs_cache, name) do
%{pack_file_md5: ^pack_file_md5, pack_data: zip_result} ->
Logger.debug("Using cache for the '#{name}' shared emoji pack")
zip_result
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_ ->
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create_archive_and_cache(name, pack, pack_dir, pack_file_md5)
end
end
@doc """
An endpoint for other instances (via admin UI) or users (via browser)
to download packs that the instance shares.
"""
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")
with {_, true} <- {:exists?, File.exists?(pack_file)},
pack = Jason.decode!(File.read!(pack_file)),
{_, true} <- {:can_download?, can_download?(pack, pack_dir)} do
zip_result = make_archive(name, pack, pack_dir)
send_download(conn, {:binary, zip_result}, filename: "#{name}.zip")
else
{:can_download?, _} ->
conn
|> put_status(:forbidden)
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|> json(%{
error: "Pack #{name} cannot be downloaded from this instance, either pack sharing\
was disabled for this pack or some files are missing"
})
{:exists?, _} ->
conn
|> put_status(:not_found)
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|> json(%{error: "Pack #{name} does not exist"})
end
end
@doc """
An admin endpoint to request downloading a pack named `pack_name` from the instance
`instance_address`.
If the requested instance's admin chose to share the pack, it will be downloaded
from that instance, otherwise it will be downloaded from the fallback source, if there is one.
"""
def download_from(conn, %{"instance_address" => address, "pack_name" => name} = data) do
shareable_packs_available =
"#{address}/.well-known/nodeinfo"
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
|> 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")
if shareable_packs_available do
full_pack =
"#{address}/api/pleroma/emoji/packs/list"
|> Tesla.get!()
|> Map.get(:body)
|> Jason.decode!()
|> Map.get(name)
pack_info_res =
case full_pack["pack"] do
%{"share-files" => true, "can-download" => true, "download-sha256" => sha} ->
{:ok,
%{
sha: sha,
uri: "#{address}/api/pleroma/emoji/packs/download_shared/#{name}"
}}
%{"fallback-src" => src, "fallback-src-sha256" => sha} when is_binary(src) ->
{:ok,
%{
sha: sha,
uri: 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, uri: uri} = pinfo} <- pack_info_res,
%{body: emoji_archive} <- Tesla.get!(uri),
{_, true} <- {:checksum, Base.decode16!(sha) == :crypto.hash(:sha256, emoji_archive)} do
local_name = data["as"] || name
pack_dir = Path.join(@emoji_dir_path, local_name)
File.mkdir_p!(pack_dir)
files = Enum.map(full_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(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
pack_file_path = Path.join(pack_dir, "pack.json")
File.write!(pack_file_path, Jason.encode!(full_pack, pretty: true))
end
json(conn, "ok")
else
{:error, e} ->
conn |> put_status(:internal_server_error) |> json(%{error: e})
{:checksum, _} ->
conn
|> put_status(:internal_server_error)
|> json(%{error: "SHA256 for the pack doesn't match the one sent by the server"})
end
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else
conn
|> put_status(:internal_server_error)
|> json(%{error: "The requested instance does not support sharing emoji packs"})
end
end
@doc """
Creates an empty pack named `name` which then can be updated via the admin UI.
"""
def create(conn, %{"name" => name}) do
pack_dir = Path.join(@emoji_dir_path, name)
if not File.exists?(pack_dir) do
File.mkdir_p!(pack_dir)
pack_file_p = Path.join(pack_dir, "pack.json")
File.write!(
pack_file_p,
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Jason.encode!(%{pack: %{}, files: %{}}, pretty: true)
)
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conn |> json("ok")
else
conn
|> put_status(:conflict)
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|> json(%{error: "A pack named \"#{name}\" already exists"})
end
end
@doc """
Deletes the pack `name` and all it's files.
"""
def delete(conn, %{"name" => name}) do
pack_dir = Path.join(@emoji_dir_path, name)
case File.rm_rf(pack_dir) do
{:ok, _} ->
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conn |> json("ok")
{:error, _} ->
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conn
|> put_status(:internal_server_error)
|> json(%{error: "Couldn't delete the pack #{name}"})
end
end
@doc """
An endpoint to update `pack_names`'s metadata.
`new_data` is the new metadata for the pack, that will replace the old metadata.
"""
def update_metadata(conn, %{"pack_name" => name, "new_data" => new_data}) do
pack_file_p = Path.join([@emoji_dir_path, name, "pack.json"])
full_pack = Jason.decode!(File.read!(pack_file_p))
# The new fallback-src is in the new data and it's not the same as it was in the old data
should_update_fb_sha =
not is_nil(new_data["fallback-src"]) and
new_data["fallback-src"] != full_pack["pack"]["fallback-src"]
with {_, true} <- {:should_update?, should_update_fb_sha},
%{body: pack_arch} <- Tesla.get!(new_data["fallback-src"]),
{:ok, flist} <- :zip.unzip(pack_arch, [:memory]),
{_, true} <- {:has_all_files?, has_all_files?(full_pack, flist)} do
fallback_sha = :crypto.hash(:sha256, pack_arch) |> Base.encode16()
new_data = Map.put(new_data, "fallback-src-sha256", fallback_sha)
update_metadata_and_send(conn, full_pack, new_data, pack_file_p)
else
{:should_update?, _} ->
update_metadata_and_send(conn, full_pack, new_data, pack_file_p)
{:has_all_files?, _} ->
conn
|> put_status(:bad_request)
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|> json(%{error: "The fallback archive does not have all files specified in pack.json"})
end
end
# Check if all files from the pack.json are in the archive
defp has_all_files?(%{"files" => files}, flist) do
Enum.all?(files, fn {_, from_manifest} ->
Enum.find(flist, fn {from_archive, _} ->
to_string(from_archive) == from_manifest
end)
end)
end
defp update_metadata_and_send(conn, full_pack, new_data, pack_file_p) do
full_pack = Map.put(full_pack, "pack", new_data)
File.write!(pack_file_p, Jason.encode!(full_pack, pretty: true))
# Send new data back with fallback sha filled
json(conn, new_data)
end
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defp get_filename(%{"filename" => filename}), do: filename
defp get_filename(%{"file" => file}) do
case file do
%Plug.Upload{filename: filename} -> filename
url when is_binary(url) -> Path.basename(url)
end
end
defp empty?(str), do: String.trim(str) == ""
defp update_file_and_send(conn, updated_full_pack, pack_file_p) do
# Write the emoji pack file
File.write!(pack_file_p, Jason.encode!(updated_full_pack, pretty: true))
# Return the modified file list
json(conn, updated_full_pack["files"])
end
@doc """
Updates a file in a pack.
Updating can mean three things:
- `add` adds an emoji named `shortcode` to the pack `pack_name`,
that means that the emoji file needs to be uploaded with the request
(thus requiring it to be a multipart request) and be named `file`.
There can also be an optional `filename` that will be the new emoji file name
(if it's not there, the name will be taken from the uploaded file).
- `update` changes emoji shortcode (from `shortcode` to `new_shortcode` or moves the file
(from the current filename to `new_filename`)
- `remove` removes the emoji named `shortcode` and it's associated file
"""
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# Add
def update_file(
conn,
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%{"pack_name" => pack_name, "action" => "add", "shortcode" => shortcode} = params
) do
pack_dir = Path.join(@emoji_dir_path, pack_name)
pack_file_p = Path.join(pack_dir, "pack.json")
full_pack = Jason.decode!(File.read!(pack_file_p))
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with {_, false} <- {:has_shortcode, Map.has_key?(full_pack["files"], shortcode)},
filename <- get_filename(params),
false <- empty?(shortcode),
false <- empty?(filename) do
file_path = Path.join(pack_dir, filename)
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# If the name contains directories, create them
if String.contains?(file_path, "/") do
File.mkdir_p!(Path.dirname(file_path))
end
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case params["file"] do
%Plug.Upload{path: upload_path} ->
# Copy the uploaded file from the temporary directory
File.copy!(upload_path, file_path)
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url when is_binary(url) ->
# Download and write the file
file_contents = Tesla.get!(url).body
File.write!(file_path, file_contents)
end
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updated_full_pack = put_in(full_pack, ["files", shortcode], filename)
update_file_and_send(conn, updated_full_pack, pack_file_p)
else
{:has_shortcode, _} ->
conn
|> put_status(:conflict)
|> json(%{error: "An emoji with the \"#{shortcode}\" shortcode already exists"})
true ->
conn
|> put_status(:bad_request)
|> json(%{error: "shortcode or filename cannot be empty"})
end
end
# Remove
def update_file(conn, %{
"pack_name" => pack_name,
"action" => "remove",
"shortcode" => shortcode
}) do
pack_dir = Path.join(@emoji_dir_path, pack_name)
pack_file_p = Path.join(pack_dir, "pack.json")
full_pack = Jason.decode!(File.read!(pack_file_p))
if Map.has_key?(full_pack["files"], shortcode) do
{emoji_file_path, updated_full_pack} = pop_in(full_pack, ["files", shortcode])
emoji_file_path = Path.join(pack_dir, emoji_file_path)
# Delete the emoji file
File.rm!(emoji_file_path)
# If the old directory has no more files, remove it
if String.contains?(emoji_file_path, "/") do
dir = Path.dirname(emoji_file_path)
if Enum.empty?(File.ls!(dir)) do
File.rmdir!(dir)
end
end
update_file_and_send(conn, updated_full_pack, pack_file_p)
else
conn
|> put_status(:bad_request)
|> json(%{error: "Emoji \"#{shortcode}\" does not exist"})
end
end
# Update
def update_file(
conn,
%{"pack_name" => pack_name, "action" => "update", "shortcode" => shortcode} = params
) do
pack_dir = Path.join(@emoji_dir_path, pack_name)
pack_file_p = Path.join(pack_dir, "pack.json")
full_pack = Jason.decode!(File.read!(pack_file_p))
with {_, true} <- {:has_shortcode, Map.has_key?(full_pack["files"], shortcode)},
%{"new_shortcode" => new_shortcode, "new_filename" => new_filename} <- params,
false <- empty?(new_shortcode),
false <- empty?(new_filename) do
# First, remove the old shortcode, saving the old path
{old_emoji_file_path, updated_full_pack} = pop_in(full_pack, ["files", shortcode])
old_emoji_file_path = Path.join(pack_dir, old_emoji_file_path)
new_emoji_file_path = Path.join(pack_dir, new_filename)
# If the name contains directories, create them
if String.contains?(new_emoji_file_path, "/") do
File.mkdir_p!(Path.dirname(new_emoji_file_path))
end
# Move/Rename the old filename to a new filename
# These are probably on the same filesystem, so just rename should work
:ok = File.rename(old_emoji_file_path, new_emoji_file_path)
# If the old directory has no more files, remove it
if String.contains?(old_emoji_file_path, "/") do
dir = Path.dirname(old_emoji_file_path)
if Enum.empty?(File.ls!(dir)) do
File.rmdir!(dir)
end
end
# Then, put in the new shortcode with the new path
updated_full_pack = put_in(updated_full_pack, ["files", new_shortcode], new_filename)
update_file_and_send(conn, updated_full_pack, pack_file_p)
else
{:has_shortcode, _} ->
conn
|> put_status(:bad_request)
|> json(%{error: "Emoji \"#{shortcode}\" does not exist"})
true ->
conn
|> put_status(:bad_request)
|> json(%{error: "new_shortcode or new_filename cannot be empty"})
_ ->
conn
|> put_status(:bad_request)
|> json(%{error: "new_shortcode or new_file were not specified"})
end
end
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def update_file(conn, %{"action" => action}) do
conn
|> put_status(:bad_request)
|> json(%{error: "Unknown action: #{action}"})
end
@doc """
Imports emoji from the filesystem.
Importing means checking all the directories in the
`$instance_static/emoji/` for directories which do not have
`pack.json`. If one has an emoji.txt file, that file will be used
to create a `pack.json` file with it's contents. If the directory has
neither, all the files with specific configured extenstions will be
assumed to be emojis and stored in the new `pack.json` file.
"""
def import_from_fs(conn, _params) do
with {:ok, results} <- File.ls(@emoji_dir_path) do
imported_pack_names =
results
|> Enum.filter(fn file ->
dir_path = Path.join(@emoji_dir_path, file)
# Find the directories that do NOT have pack.json
File.dir?(dir_path) and not File.exists?(Path.join(dir_path, "pack.json"))
end)
|> Enum.map(&write_pack_json_contents/1)
json(conn, imported_pack_names)
else
{:error, _} ->
conn
|> put_status(:internal_server_error)
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|> json(%{error: "Error accessing emoji pack directory"})
end
end
defp write_pack_json_contents(dir) do
dir_path = Path.join(@emoji_dir_path, dir)
emoji_txt_path = Path.join(dir_path, "emoji.txt")
files_for_pack = files_for_pack(emoji_txt_path, dir_path)
pack_json_contents = Jason.encode!(%{pack: %{}, files: files_for_pack})
File.write!(Path.join(dir_path, "pack.json"), pack_json_contents)
dir
end
defp files_for_pack(emoji_txt_path, dir_path) do
if File.exists?(emoji_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 fileh
# FIXME: Copy-pasted from Pleroma.Emoji/load_from_file_stream/2
# Create a map of shortcodes to filenames from emoji.txt
File.read!(emoji_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 | _] -> {name, file}
_ -> nil
end
end)
|> Enum.filter(fn x -> not is_nil(x) end)
|> 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])
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Pleroma.Emoji.Loader.make_shortcode_to_file_map(dir_path, pack_extensions)
end
end
end