mobilizon/lib/web/upload/upload.ex

226 lines
7.1 KiB
Elixir

# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/upload.ex
defmodule Mobilizon.Web.Upload do
@moduledoc """
Manage user uploads
Options:
* `:type`: presets for activity type (defaults to Document) and size limits from app configuration
* `:description`: upload alternative text
* `:base_url`: override base url
* `:uploader`: override uploader
* `:filters`: override filters
* `:size_limit`: override size limit
* `:activity_type`: override activity type
The `%Mobilizon.Web.Upload{}` struct: all documented fields are meant to be overwritten in filters:
* `:id` - the upload id.
* `:name` - the upload file name.
* `:path` - the upload path: set at first to `id/name` but can be changed. Keep in mind that the path
is once created permanent and changing it (especially in uploaders) is probably a bad idea!
* `:tempfile` - path to the temporary file. Prefer in-place changes on the file rather than changing the
path as the temporary file is also tracked by `Plug.Upload{}` and automatically deleted once the request is over.
Related behaviors:
* `Mobilizon.Web.Upload.Uploader`
* `Mobilizon.Web.Upload.Filter`
"""
alias Ecto.UUID
alias Mobilizon.Config
alias Mobilizon.Web.Endpoint
alias Mobilizon.Web.Upload.{Filter, MIME, Uploader}
require Logger
@type source ::
Plug.Upload.t()
| (data_uri_string :: String.t())
| {:from_local, name :: String.t(), id :: String.t(), path :: String.t()}
@type option ::
{:type, :avatar | :banner | :background}
| {:description, String.t()}
| {:activity_type, String.t()}
| {:size_limit, nil | non_neg_integer()}
| {:uploader, module()}
| {:filters, [module()]}
@type t :: %__MODULE__{
id: String.t(),
name: String.t(),
tempfile: String.t(),
content_type: String.t(),
path: String.t(),
size: integer()
}
defstruct [:id, :name, :tempfile, :content_type, :path, :size]
@spec store(source, options :: [option()]) :: {:ok, map()} | {:error, any()}
def store(upload, opts \\ []) do
opts = get_opts(opts)
with {:ok, upload} <- prepare_upload(upload, opts),
upload = %__MODULE__{upload | path: upload.path || "#{upload.id}/#{upload.name}"},
{:ok, upload} <- Filter.filter(opts.filters, upload),
{:ok, url_spec} <- Uploader.put_file(opts.uploader, upload) do
{:ok,
%{
name: Map.get(opts, :description) || upload.name,
url: url_from_spec(upload, opts.base_url, url_spec),
content_type: upload.content_type,
size: upload.size
}}
else
{:error, error} ->
Logger.error(
"#{__MODULE__} store (using #{inspect(opts.uploader)}) failed: #{inspect(error)}"
)
{:error, error}
end
end
def remove(url, opts \\ []) do
with opts <- get_opts(opts),
%URI{path: "/media/" <> path, host: host} <- URI.parse(url),
{:same_host, true} <- {:same_host, host == Endpoint.host()} do
Uploader.remove_file(opts.uploader, path)
else
%URI{} = _uri ->
{:error, "URL doesn't match pattern"}
{:same_host, _} ->
Logger.error("Media can't be deleted because its URL doesn't match current host")
end
end
def char_unescaped?(char) do
URI.char_unreserved?(char) or char == ?/
end
defp get_opts(opts) do
{size_limit, activity_type} =
case Keyword.get(opts, :type) do
:banner ->
{Config.get!([:instance, :banner_upload_limit]), "Image"}
:avatar ->
{Config.get!([:instance, :avatar_upload_limit]), "Image"}
_ ->
{Config.get!([:instance, :upload_limit]), nil}
end
%{
activity_type: Keyword.get(opts, :activity_type, activity_type),
size_limit: Keyword.get(opts, :size_limit, size_limit),
uploader: Keyword.get(opts, :uploader, Config.get([__MODULE__, :uploader])),
filters: Keyword.get(opts, :filters, Config.get([__MODULE__, :filters])),
description: Keyword.get(opts, :description),
allow_list_mime_types:
Keyword.get(
opts,
:allow_list_mime_types,
Config.get([__MODULE__, :allow_list_mime_types])
),
base_url:
Keyword.get(
opts,
:base_url,
Config.get([__MODULE__, :base_url], Endpoint.url())
)
}
end
defp prepare_upload(%Plug.Upload{} = file, opts) do
with {:ok, size} <- check_file_size(file.path, opts.size_limit),
{:ok, content_type, name} <- MIME.file_mime_type(file.path, file.filename),
:ok <- check_allowed_mime_type(content_type, opts.allow_list_mime_types) do
{:ok,
%__MODULE__{
id: UUID.generate(),
name: name,
tempfile: file.path,
content_type: content_type,
size: size
}}
end
end
defp prepare_upload(%{body: body, name: name} = _file, opts) do
with :ok <- check_binary_size(body, opts.size_limit),
tmp_path <- tempfile_for_image(body),
{:ok, content_type, name} <- MIME.file_mime_type(tmp_path, name),
:ok <- check_allowed_mime_type(content_type, opts.allow_list_mime_types) do
{:ok,
%__MODULE__{
id: UUID.generate(),
name: name,
tempfile: tmp_path,
content_type: content_type,
size: byte_size(body)
}}
end
end
defp check_file_size(path, size_limit) when is_integer(size_limit) and size_limit > 0 do
with {:ok, %{size: size}} <- File.stat(path),
true <- size <= size_limit do
{:ok, size}
else
false -> {:error, :file_too_large}
error -> error
end
end
defp check_file_size(_, _), do: :ok
defp check_binary_size(binary, size_limit)
when is_integer(size_limit) and size_limit > 0 and byte_size(binary) >= size_limit do
{:error, :file_too_large}
end
defp check_binary_size(_, _), do: :ok
# Creates a tempfile using the Plug.Upload Genserver which cleans them up
# automatically.
defp tempfile_for_image(data) do
{:ok, tmp_path} = Plug.Upload.random_file("temp_files")
{:ok, tmp_file} = File.open(tmp_path, [:write, :raw, :binary])
IO.binwrite(tmp_file, data)
tmp_path
end
defp url_from_spec(%__MODULE__{name: name}, base_url, {:file, path}) do
path =
URI.encode(path, &char_unescaped?/1) <>
if Config.get([__MODULE__, :link_name], false) do
"?name=#{URI.encode(name, &char_unescaped?/1)}"
else
""
end
[base_url, "media", path]
|> Path.join()
end
defp url_from_spec(_upload, _base_url, {:url, url}), do: url
@spec check_allowed_mime_type(String.t(), List.t()) :: :ok | {:error, :atom}
defp check_allowed_mime_type(content_type, allow_list_mime_types) do
if Enum.any?(allow_list_mime_types, &(&1 == content_type)),
do: :ok,
else: {:error, :mime_type_not_allowed}
end
end