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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.ConfigDB do
   6   use Ecto.Schema
   7
   8   import Ecto.Changeset
   9   import Ecto.Query, only: [select: 3]
  10   import Pleroma.Web.Gettext
  11
  12   alias __MODULE__
  13   alias Pleroma.Repo
  14
  15   @type t :: %__MODULE__{}
  16
  17   @full_subkey_update [
  18     {:pleroma, :assets, :mascots},
  19     {:pleroma, :emoji, :groups},
  20     {:pleroma, :workers, :retries},
  21     {:pleroma, :mrf_subchain, :match_actor},
  22     {:pleroma, :mrf_keyword, :replace}
  23   ]
  24
  25   schema "config" do
  26     field(:key, Pleroma.Config.Type.Atom)
  27     field(:group, Pleroma.Config.Type.Atom)
  28     field(:value, Pleroma.Config.Type.BinaryValue)
  29     field(:db, {:array, :string}, virtual: true, default: [])
  30
  31     timestamps()
  32   end
  33
  34   @spec get_all_as_keyword() :: keyword()
  35   def get_all_as_keyword do
  36     ConfigDB
  37     |> select([c], {c.group, c.key, c.value})
  38     |> Repo.all()
  39     |> Enum.reduce([], fn {group, key, value}, acc ->
  40       Keyword.update(acc, group, [{key, value}], &Keyword.merge(&1, [{key, value}]))
  41     end)
  42   end
  43
  44   @spec get_by_params(map()) :: ConfigDB.t() | nil
  45   def get_by_params(params), do: Repo.get_by(ConfigDB, params)
  46
  47   @spec changeset(ConfigDB.t(), map()) :: Changeset.t()
  48   def changeset(config, params \\ %{}) do
  49     config
  50     |> cast(params, [:key, :group, :value])
  51     |> validate_required([:key, :group, :value])
  52     |> unique_constraint(:key, name: :config_group_key_index)
  53   end
  54
  55   defp create(params) do
  56     %ConfigDB{}
  57     |> changeset(params)
  58     |> Repo.insert()
  59   end
  60
  61   defp update(%ConfigDB{} = config, %{value: value}) do
  62     config
  63     |> changeset(%{value: value})
  64     |> Repo.update()
  65   end
  66
  67   @spec get_db_keys(keyword(), any()) :: [String.t()]
  68   def get_db_keys(value, key) do
  69     keys =
  70       if Keyword.keyword?(value) do
  71         Keyword.keys(value)
  72       else
  73         [key]
  74       end
  75
  76     Enum.map(keys, &to_json_types(&1))
  77   end
  78
  79   @spec merge_group(atom(), atom(), keyword(), keyword()) :: keyword()
  80   def merge_group(group, key, old_value, new_value) do
  81     new_keys = to_mapset(new_value)
  82
  83     intersect_keys = old_value |> to_mapset() |> MapSet.intersection(new_keys) |> MapSet.to_list()
  84
  85     merged_value = ConfigDB.merge(old_value, new_value)
  86
  87     @full_subkey_update
  88     |> Enum.map(fn
  89       {g, k, subkey} when g == group and k == key ->
  90         if subkey in intersect_keys, do: subkey, else: []
  91
  92       _ ->
  93         []
  94     end)
  95     |> List.flatten()
  96     |> Enum.reduce(merged_value, &Keyword.put(&2, &1, new_value[&1]))
  97   end
  98
  99   defp to_mapset(keyword) do
 100     keyword
 101     |> Keyword.keys()
 102     |> MapSet.new()
 103   end
 104
 105   @spec sub_key_full_update?(atom(), atom(), [Keyword.key()]) :: boolean()
 106   def sub_key_full_update?(group, key, subkeys) do
 107     Enum.any?(@full_subkey_update, fn {g, k, subkey} ->
 108       g == group and k == key and subkey in subkeys
 109     end)
 110   end
 111
 112   @spec merge(keyword(), keyword()) :: keyword()
 113   def merge(config1, config2) when is_list(config1) and is_list(config2) do
 114     Keyword.merge(config1, config2, fn _, app1, app2 ->
 115       if Keyword.keyword?(app1) and Keyword.keyword?(app2) do
 116         Keyword.merge(app1, app2, &deep_merge/3)
 117       else
 118         app2
 119       end
 120     end)
 121   end
 122
 123   defp deep_merge(_key, value1, value2) do
 124     if Keyword.keyword?(value1) and Keyword.keyword?(value2) do
 125       Keyword.merge(value1, value2, &deep_merge/3)
 126     else
 127       value2
 128     end
 129   end
 130
 131   @spec update_or_create(map()) :: {:ok, ConfigDB.t()} | {:error, Changeset.t()}
 132   def update_or_create(params) do
 133     params = Map.put(params, :value, to_elixir_types(params[:value]))
 134     search_opts = Map.take(params, [:group, :key])
 135
 136     with %ConfigDB{} = config <- ConfigDB.get_by_params(search_opts),
 137          {_, true, config} <- {:partial_update, can_be_partially_updated?(config), config},
 138          {_, true, config} <-
 139            {:can_be_merged, is_list(params[:value]) and is_list(config.value), config} do
 140       new_value = merge_group(config.group, config.key, config.value, params[:value])
 141       update(config, %{value: new_value})
 142     else
 143       {reason, false, config} when reason in [:partial_update, :can_be_merged] ->
 144         update(config, params)
 145
 146       nil ->
 147         create(params)
 148     end
 149   end
 150
 151   defp can_be_partially_updated?(%ConfigDB{} = config), do: not only_full_update?(config)
 152
 153   defp only_full_update?(%ConfigDB{group: group, key: key}) do
 154     full_key_update = [
 155       {:pleroma, :ecto_repos},
 156       {:quack, :meta},
 157       {:mime, :types},
 158       {:cors_plug, [:max_age, :methods, :expose, :headers]},
 159       {:auto_linker, :opts},
 160       {:swarm, :node_blacklist},
 161       {:logger, :backends}
 162     ]
 163
 164     Enum.any?(full_key_update, fn
 165       {s_group, s_key} ->
 166         group == s_group and ((is_list(s_key) and key in s_key) or key == s_key)
 167     end)
 168   end
 169
 170   @spec delete(map()) :: {:ok, ConfigDB.t()} | {:error, Changeset.t()}
 171   def delete(params) do
 172     search_opts = Map.delete(params, :subkeys)
 173
 174     with %ConfigDB{} = config <- ConfigDB.get_by_params(search_opts),
 175          {config, sub_keys} when is_list(sub_keys) <- {config, params[:subkeys]},
 176          keys <- Enum.map(sub_keys, &string_to_elixir_types(&1)),
 177          {_, config, new_value} when new_value != [] <-
 178            {:partial_remove, config, Keyword.drop(config.value, keys)} do
 179       update(config, %{value: new_value})
 180     else
 181       {:partial_remove, config, []} ->
 182         Repo.delete(config)
 183
 184       {config, nil} ->
 185         Repo.delete(config)
 186
 187       nil ->
 188         err =
 189           dgettext("errors", "Config with params %{params} not found", params: inspect(params))
 190
 191         {:error, err}
 192     end
 193   end
 194
 195   @spec to_json_types(term()) :: map() | list() | boolean() | String.t()
 196   def to_json_types(entity) when is_list(entity) do
 197     Enum.map(entity, &to_json_types/1)
 198   end
 199
 200   def to_json_types(%Regex{} = entity), do: inspect(entity)
 201
 202   def to_json_types(entity) when is_map(entity) do
 203     Map.new(entity, fn {k, v} -> {to_json_types(k), to_json_types(v)} end)
 204   end
 205
 206   def to_json_types({:args, args}) when is_list(args) do
 207     arguments =
 208       Enum.map(args, fn
 209         arg when is_tuple(arg) -> inspect(arg)
 210         arg -> to_json_types(arg)
 211       end)
 212
 213     %{"tuple" => [":args", arguments]}
 214   end
 215
 216   def to_json_types({:proxy_url, {type, :localhost, port}}) do
 217     %{"tuple" => [":proxy_url", %{"tuple" => [to_json_types(type), "localhost", port]}]}
 218   end
 219
 220   def to_json_types({:proxy_url, {type, host, port}}) when is_tuple(host) do
 221     ip =
 222       host
 223       |> :inet_parse.ntoa()
 224       |> to_string()
 225
 226     %{
 227       "tuple" => [
 228         ":proxy_url",
 229         %{"tuple" => [to_json_types(type), ip, port]}
 230       ]
 231     }
 232   end
 233
 234   def to_json_types({:proxy_url, {type, host, port}}) do
 235     %{
 236       "tuple" => [
 237         ":proxy_url",
 238         %{"tuple" => [to_json_types(type), to_string(host), port]}
 239       ]
 240     }
 241   end
 242
 243   def to_json_types({:partial_chain, entity}),
 244     do: %{"tuple" => [":partial_chain", inspect(entity)]}
 245
 246   def to_json_types(entity) when is_tuple(entity) do
 247     value =
 248       entity
 249       |> Tuple.to_list()
 250       |> to_json_types()
 251
 252     %{"tuple" => value}
 253   end
 254
 255   def to_json_types(entity) when is_binary(entity), do: entity
 256
 257   def to_json_types(entity) when is_boolean(entity) or is_number(entity) or is_nil(entity) do
 258     entity
 259   end
 260
 261   def to_json_types(entity) when entity in [:"tlsv1.1", :"tlsv1.2", :"tlsv1.3"] do
 262     ":#{entity}"
 263   end
 264
 265   def to_json_types(entity) when is_atom(entity), do: inspect(entity)
 266
 267   @spec to_elixir_types(boolean() | String.t() | map() | list()) :: term()
 268   def to_elixir_types(%{"tuple" => [":args", args]}) when is_list(args) do
 269     arguments =
 270       Enum.map(args, fn arg ->
 271         if String.contains?(arg, ["{", "}"]) do
 272           {elem, []} = Code.eval_string(arg)
 273           elem
 274         else
 275           to_elixir_types(arg)
 276         end
 277       end)
 278
 279     {:args, arguments}
 280   end
 281
 282   def to_elixir_types(%{"tuple" => [":proxy_url", %{"tuple" => [type, host, port]}]}) do
 283     {:proxy_url, {string_to_elixir_types(type), parse_host(host), port}}
 284   end
 285
 286   def to_elixir_types(%{"tuple" => [":partial_chain", entity]}) do
 287     {partial_chain, []} =
 288       entity
 289       |> String.replace(~r/[^\w|^{:,[|^,|^[|^\]^}|^\/|^\.|^"]^\s/, "")
 290       |> Code.eval_string()
 291
 292     {:partial_chain, partial_chain}
 293   end
 294
 295   def to_elixir_types(%{"tuple" => entity}) do
 296     Enum.reduce(entity, {}, &Tuple.append(&2, to_elixir_types(&1)))
 297   end
 298
 299   def to_elixir_types(entity) when is_map(entity) do
 300     Map.new(entity, fn {k, v} -> {to_elixir_types(k), to_elixir_types(v)} end)
 301   end
 302
 303   def to_elixir_types(entity) when is_list(entity) do
 304     Enum.map(entity, &to_elixir_types/1)
 305   end
 306
 307   def to_elixir_types(entity) when is_binary(entity) do
 308     entity
 309     |> String.trim()
 310     |> string_to_elixir_types()
 311   end
 312
 313   def to_elixir_types(entity), do: entity
 314
 315   @spec string_to_elixir_types(String.t()) ::
 316           atom() | Regex.t() | module() | String.t() | no_return()
 317   def string_to_elixir_types("~r" <> _pattern = regex) do
 318     pattern =
 319       ~r/^~r(?'delimiter'[\/|"'([{<]{1})(?'pattern'.+)[\/|"')\]}>]{1}(?'modifier'[uismxfU]*)/u
 320
 321     delimiters = ["/", "|", "\"", "'", {"(", ")"}, {"[", "]"}, {"{", "}"}, {"<", ">"}]
 322
 323     with %{"modifier" => modifier, "pattern" => pattern, "delimiter" => regex_delimiter} <-
 324            Regex.named_captures(pattern, regex),
 325          {:ok, {leading, closing}} <- find_valid_delimiter(delimiters, pattern, regex_delimiter),
 326          {result, _} <- Code.eval_string("~r#{leading}#{pattern}#{closing}#{modifier}") do
 327       result
 328     end
 329   end
 330
 331   def string_to_elixir_types(":" <> atom), do: String.to_atom(atom)
 332
 333   def string_to_elixir_types(value) do
 334     if module_name?(value) do
 335       String.to_existing_atom("Elixir." <> value)
 336     else
 337       value
 338     end
 339   end
 340
 341   defp parse_host("localhost"), do: :localhost
 342
 343   defp parse_host(host) do
 344     charlist = to_charlist(host)
 345
 346     case :inet.parse_address(charlist) do
 347       {:error, :einval} ->
 348         charlist
 349
 350       {:ok, ip} ->
 351         ip
 352     end
 353   end
 354
 355   defp find_valid_delimiter([], _string, _) do
 356     raise(ArgumentError, message: "valid delimiter for Regex expression not found")
 357   end
 358
 359   defp find_valid_delimiter([{leading, closing} = delimiter | others], pattern, regex_delimiter)
 360        when is_tuple(delimiter) do
 361     if String.contains?(pattern, closing) do
 362       find_valid_delimiter(others, pattern, regex_delimiter)
 363     else
 364       {:ok, {leading, closing}}
 365     end
 366   end
 367
 368   defp find_valid_delimiter([delimiter | others], pattern, regex_delimiter) do
 369     if String.contains?(pattern, delimiter) do
 370       find_valid_delimiter(others, pattern, regex_delimiter)
 371     else
 372       {:ok, {delimiter, delimiter}}
 373     end
 374   end
 375
 376   @spec module_name?(String.t()) :: boolean()
 377   def module_name?(string) do
 378     Regex.match?(~r/^(Pleroma|Phoenix|Tesla|Quack|Ueberauth|Swoosh)\./, string) or
 379       string in ["Oban", "Ueberauth", "ExSyslogger"]
 380   end
 381 end