Merge branch 'develop' of https://git.pleroma.social/pleroma/pleroma into develop

[akkoma] / lib / pleroma / web / controller_helper.ex

diff --git a/lib/pleroma/web/controller_helper.ex b/lib/pleroma/web/controller_helper.ex
index ddf958811437a07e44dda313dbc6c5778efc7e03..eeac9f503ccf09d75fc216b9ee2c9beab7622b15 100644 (file)
--- a/lib/pleroma/web/controller_helper.ex
+++ b/lib/pleroma/web/controller_helper.ex
@@ -1,9 +1,112 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.ControllerHelper do
   use Pleroma.Web, :controller
 
+  # As in MastoAPI, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
+  @falsy_param_values [false, 0, "0", "f", "F", "false", "FALSE", "off", "OFF"]
+  def truthy_param?(blank_value) when blank_value in [nil, ""], do: nil
+  def truthy_param?(value), do: value not in @falsy_param_values
+
   def json_response(conn, status, json) do
     conn
     |> put_status(status)
     |> json(json)
   end
+
+  @spec fetch_integer_param(map(), String.t(), integer() | nil) :: integer() | nil
+  def fetch_integer_param(params, name, default \\ nil) do
+    params
+    |> Map.get(name, default)
+    |> param_to_integer(default)
+  end
+
+  defp param_to_integer(val, _) when is_integer(val), do: val
+
+  defp param_to_integer(val, default) when is_binary(val) do
+    case Integer.parse(val) do
+      {res, _} -> res
+      _ -> default
+    end
+  end
+
+  defp param_to_integer(_, default), do: default
+
+  def add_link_headers(
+        conn,
+        method,
+        activities,
+        param \\ nil,
+        params \\ %{},
+        func3 \\ nil,
+        func4 \\ nil
+      ) do
+    params =
+      conn.params
+      |> Map.drop(["since_id", "max_id", "min_id"])
+      |> Map.merge(params)
+
+    last = List.last(activities)
+
+    func3 = func3 || (&mastodon_api_url/3)
+    func4 = func4 || (&mastodon_api_url/4)
+
+    if last do
+      max_id = last.id
+
+      limit =
+        params
+        |> Map.get("limit", "20")
+        |> String.to_integer()
+
+      min_id =
+        if length(activities) <= limit do
+          activities
+          |> List.first()
+          |> Map.get(:id)
+        else
+          activities
+          |> Enum.at(limit * -1)
+          |> Map.get(:id)
+        end
+
+      {next_url, prev_url} =
+        if param do
+          {
+            func4.(
+              Pleroma.Web.Endpoint,
+              method,
+              param,
+              Map.merge(params, %{max_id: max_id})
+            ),
+            func4.(
+              Pleroma.Web.Endpoint,
+              method,
+              param,
+              Map.merge(params, %{min_id: min_id})
+            )
+          }
+        else
+          {
+            func3.(
+              Pleroma.Web.Endpoint,
+              method,
+              Map.merge(params, %{max_id: max_id})
+            ),
+            func3.(
+              Pleroma.Web.Endpoint,
+              method,
+              Map.merge(params, %{min_id: min_id})
+            )
+          }
+        end
+
+      conn
+      |> put_resp_header("link", "<#{next_url}>; rel=\"next\", <#{prev_url}>; rel=\"prev\"")
+    else
+      conn
+    end
+  end
 end