feat: simple, but not stupid, uploader for IPFS

fix: format fix with credo

lib/pleroma/uploaders/ipfs.ex

@@ -0,0 +1,64 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Uploaders.IPFS do
+  @behaviour Pleroma.Uploaders.Uploader
+  require Logger
+
+  alias Pleroma.Config
+  alias Tesla.Multipart
+
+  @impl true
+  def get_file(file) do
+    b_url = Pleroma.Upload.base_url()
+
+    if String.contains?(b_url, "{CID}") do
+      {:ok, {:url, String.replace(b_url, "{CID}", URI.decode(file))}}
+    else
+      {:error, "IPFS Get URL doesn't contain '{CID}' placeholder"}
+    end
+  end
+
+  @impl true
+  def put_file(%Pleroma.Upload{} = upload) do
+    config = Config.get([__MODULE__])
+    post_base_url = Keyword.get(config, :post_gateway_url)
+
+    mp =
+      Multipart.new()
+      |> Multipart.add_content_type_param("charset=utf-8")
+      |> Multipart.add_file(upload.tempfile)
+
+    final_url = Path.join([post_base_url, "/api/v0/add"])
+
+    case Pleroma.HTTP.post(final_url, mp, [], params: ["cid-version": "1"]) do
+      {:ok, ret} ->
+        case Jason.decode(ret.body) do
+          {:ok, ret} ->
+            {:ok, {:file, ret["Hash"]}}
+
+          error ->
+            Logger.error("#{__MODULE__}: #{inspect(error)}")
+            {:error, "JSON decode failed"}
+        end
+
+      error ->
+        Logger.error("#{__MODULE__}: #{inspect(error)}")
+        {:error, "IPFS Gateway Upload failed"}
+    end
+  end
+
+  @impl true
+  def delete_file(file) do
+    config = Config.get([__MODULE__])
+    post_base_url = Keyword.get(config, :post_gateway_url)
+
+    final_url = Path.join([post_base_url, "/api/v0/files/rm"])
+
+    case Pleroma.HTTP.post(final_url, "", [], params: [arg: file]) do
+      {:ok, %{status_code: 204}} -> :ok
+      error -> {:error, inspect(error)}
+    end
+  end
+end