forked from AkkomaGang/akkoma
72 lines
2.4 KiB
Elixir
72 lines
2.4 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Uploaders.Uploader do
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@moduledoc """
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Defines the contract to put and get an uploaded file to any backend.
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"""
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@doc """
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Instructs how to get the file from the backend.
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Used by `Pleroma.Plugs.UploadedMedia`.
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"""
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@type get_method :: {:static_dir, directory :: String.t()} | {:url, url :: String.t()}
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@callback get_file(file :: String.t()) :: {:ok, get_method()}
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@doc """
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Put a file to the backend.
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Returns:
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* `:ok` which assumes `{:ok, upload.path}`
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* `{:ok, spec}` where spec is:
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* `{:file, filename :: String.t}` to handle reads with `get_file/1` (recommended)
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This allows to correctly proxy or redirect requests to the backend, while allowing to migrate backends without breaking any URL.
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* `{url, url :: String.t}` to bypass `get_file/2` and use the `url` directly in the activity.
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* `{:error, String.t}` error information if the file failed to be saved to the backend.
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* `:wait_callback` will wait for an http post request at `/api/pleroma/upload_callback/:upload_path` and call the uploader's `http_callback/3` method.
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"""
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@type file_spec :: {:file | :url, String.t()}
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@callback put_file(Pleroma.Upload.t()) ::
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:ok | {:ok, file_spec()} | {:error, String.t()} | :wait_callback
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@callback http_callback(Plug.Conn.t(), Map.t()) ::
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{:ok, Plug.Conn.t()}
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| {:ok, Plug.Conn.t(), file_spec()}
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| {:error, Plug.Conn.t(), String.t()}
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@optional_callbacks http_callback: 2
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@spec put_file(module(), Pleroma.Upload.t()) :: {:ok, file_spec()} | {:error, String.t()}
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def put_file(uploader, upload) do
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case uploader.put_file(upload) do
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:ok -> {:ok, {:file, upload.path}}
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:wait_callback -> handle_callback(uploader, upload)
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{:ok, _} = ok -> ok
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{:error, _} = error -> error
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end
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end
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defp handle_callback(uploader, upload) do
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:global.register_name({__MODULE__, upload.path}, self())
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receive do
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{__MODULE__, pid, conn, params} ->
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case uploader.http_callback(conn, params) do
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{:ok, conn, ok} ->
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send(pid, {__MODULE__, conn})
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{:ok, ok}
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{:error, conn, error} ->
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send(pid, {__MODULE__, conn})
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{:error, error}
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end
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after
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30_000 -> {:error, "Uploader callback timeout"}
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end
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end
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end
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