upload: add new optional argument designating an upload size limit

lib/pleroma/upload.ex

@@ -4,61 +4,76 @@ defmodule Pleroma.Upload do
   @storage_backend Application.get_env(:pleroma, Pleroma.Upload)
                    |> Keyword.fetch!(:uploader)
 
-  def store(%Plug.Upload{} = file, should_dedupe) do
+  def check_file_size(path, nil), do: true
-    content_type = get_content_type(file.path)
 
-    uuid = get_uuid(file, should_dedupe)
+  def check_file_size(path, size_limit) do
-    name = get_name(file, uuid, content_type, should_dedupe)
+    {:ok, %{size: size}} = File.stat(path)
-
+    size <= size_limit
-    strip_exif_data(content_type, file.path)
-
-    {:ok, url_path} =
-      @storage_backend.put_file(name, uuid, file.path, content_type, should_dedupe)
-
-    %{
-      "type" => "Document",
-      "url" => [
-        %{
-          "type" => "Link",
-          "mediaType" => content_type,
-          "href" => url_path
-        }
-      ],
-      "name" => name
-    }
   end
 
-  def store(%{"img" => "data:image/" <> image_data}, should_dedupe) do
+  def store(file, should_dedupe, size_limit \\ nil)
+
+  def store(%Plug.Upload{} = file, should_dedupe, size_limit) do
+    content_type = get_content_type(file.path)
+
+    with uuid <- get_uuid(file, should_dedupe),
+         name <- get_name(file, uuid, content_type, should_dedupe),
+         true <- check_file_size(file.path, size_limit) do
+      strip_exif_data(content_type, file.path)
+
+      {:ok, url_path} =
+        @storage_backend.put_file(name, uuid, file.path, content_type, should_dedupe)
+
+      %{
+        "type" => "Document",
+        "url" => [
+          %{
+            "type" => "Link",
+            "mediaType" => content_type,
+            "href" => url_path
+          }
+        ],
+        "name" => name
+      }
+    else
+      _e -> nil
+    end
+  end
+
+  def store(%{"img" => "data:image/" <> image_data}, should_dedupe, size_limit) do
     parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data)
     data = Base.decode64!(parsed["data"], ignore: :whitespace)
 
-    tmp_path = tempfile_for_image(data)
+    with tmp_path <- tempfile_for_image(data),
+         uuid <- UUID.generate(),
+         true <- check_file_size(tmp_path, size_limit) do
+      content_type = get_content_type(tmp_path)
+      strip_exif_data(content_type, tmp_path)
 
-    uuid = UUID.generate()
+      name =
+        create_name(
+          String.downcase(Base.encode16(:crypto.hash(:sha256, data))),
+          parsed["filetype"],
+          content_type
+        )
 
-    content_type = get_content_type(tmp_path)
+      {:ok, url_path} =
-    strip_exif_data(content_type, tmp_path)
+        @storage_backend.put_file(name, uuid, tmp_path, content_type, should_dedupe)
 
-    name =
+      %{
-      create_name(
+        "type" => "Image",
-        String.downcase(Base.encode16(:crypto.hash(:sha256, data))),
+        "url" => [
-        parsed["filetype"],
+          %{
-        content_type
+            "type" => "Link",
-      )
+            "mediaType" => content_type,
-
+            "href" => url_path
-    {:ok, url_path} = @storage_backend.put_file(name, uuid, tmp_path, content_type, should_dedupe)
+          }
-
+        ],
-    %{
+        "name" => name
-      "type" => "Image",
+      }
-      "url" => [
+    else
-        %{
+      _e -> nil
-          "type" => "Link",
+    end
-          "mediaType" => content_type,
-          "href" => url_path
-        }
-      ],
-      "name" => name
-    }
   end
 
   @doc """