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diff --git a/lib/pleroma/web/api_spec/helpers.ex b/lib/pleroma/web/api_spec/helpers.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ApiSpec.Helpers do
+  alias OpenApiSpex.Operation
+  alias OpenApiSpex.Schema
+  alias Pleroma.Web.ApiSpec.Schemas.BooleanLike
+
+  def request_body(description, schema_ref, opts \\ []) do
+    media_types = ["application/json", "multipart/form-data", "application/x-www-form-urlencoded"]
+
+    content =
+      media_types
+      |> Enum.map(fn type ->
+        {type,
+         %OpenApiSpex.MediaType{
+           schema: schema_ref,
+           example: opts[:example],
+           examples: opts[:examples]
+         }}
+      end)
+      |> Enum.into(%{})
+
+    %OpenApiSpex.RequestBody{
+      description: description,
+      content: content,
+      required: opts[:required] || false
+    }
+  end
+
+  def pagination_params do
+    [
+      Operation.parameter(:max_id, :query, :string, "Return items older than this ID"),
+      Operation.parameter(:min_id, :query, :string, "Return the oldest items newer than this ID"),
+      Operation.parameter(
+        :since_id,
+        :query,
+        :string,
+        "Return the newest items newer than this ID"
+      ),
+      Operation.parameter(
+        :limit,
+        :query,
+        %Schema{type: :integer, default: 20},
+        "Maximum number of items to return. Will be ignored if it's more than 40"
+      )
+    ]
+  end
+
+  def with_relationships_param do
+    Operation.parameter(
+      :with_relationships,
+      :query,
+      BooleanLike,
+      "Embed relationships into accounts."
+    )
+  end
+
+  def empty_object_response do
+    Operation.response("Empty object", "application/json", %Schema{type: :object, example: %{}})
+  end
+
+  def empty_array_response do
+    Operation.response("Empty array", "application/json", %Schema{type: :array, example: []})
+  end
+
+  def no_content_response do
+    Operation.response("No Content", "application/json", %Schema{type: :string, example: ""})
+  end
+end