defmodule Pleroma.Web.PleromaAPI.EmojiAPIController do use Pleroma.Web, :controller require Logger @emoji_dir_path Path.join( Pleroma.Config.get!([:instance, :static_dir]), "emoji" ) @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 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) {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 defp create_archive_and_cache(name, pack, pack_dir, md5) do files = ['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)]) cache_ms = :timer.seconds(@cache_seconds_per_file * Enum.count(files)) Cachex.put!( :emoji_packs_cache, name, # if pack.json MD5 changes, the cache is not valid anymore %{pack_json_md5: md5, pack_data: zip_result}, # 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, \ keeping it in cache for #{div(cache_ms, 1000)}s") zip_result end defp make_archive(name, pack, pack_dir) do # Having a different pack.json md5 invalidates cache pack_file_md5 = :crypto.hash(:md5, File.read!(Path.join(pack_dir, "pack.json"))) 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 _ -> 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) 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) |> 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) |> 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 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, Jason.encode!(%{pack: %{}, files: %{}}, pretty: true) ) conn |> json("ok") else conn |> put_status(:conflict) |> 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, _} -> conn |> json("ok") {:error, _} -> 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) |> 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 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 """ # Add def update_file( conn, %{"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)) 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) # If the name contains directories, create them if String.contains?(file_path, "/") do File.mkdir_p!(Path.dirname(file_path)) end case params["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 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 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) |> 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]) Pleroma.Emoji.make_shortcode_to_file_map(dir_path, pack_extensions) end end end