Merge branch '1873-pagination-fixes' into 'develop'

[#1873] :offset pagination param support, hashtags pagination

Closes #1873

See merge request pleroma/pleroma!2659

lib/pleroma/pagination.ex

@@ -64,6 +64,12 @@ defmodule Pleroma.Pagination do
   @spec paginate(Ecto.Query.t(), map(), type(), atom() | nil) :: [Ecto.Schema.t()]
   def paginate(query, options, method \\ :keyset, table_binding \\ nil)
 
+  def paginate(list, options, _method, _table_binding) when is_list(list) do
+    offset = options[:offset] || 0
+    limit = options[:limit] || 0
+    Enum.slice(list, offset, limit)
+  end
+
   def paginate(query, options, :keyset, table_binding) do
     query
     |> restrict(:min_id, options, table_binding)

lib/pleroma/web/api_spec/helpers.ex

@@ -39,6 +39,12 @@ defmodule Pleroma.Web.ApiSpec.Helpers do
         :string,
         "Return the newest items newer than this ID"
       ),
+      Operation.parameter(
+        :offset,
+        :query,
+        %Schema{type: :integer, default: 0},
+        "Return items past this number of items"
+      ),
       Operation.parameter(
         :limit,
         :query,

lib/pleroma/web/mastodon_api/controllers/search_controller.ex

@@ -107,21 +107,21 @@ defmodule Pleroma.Web.MastodonAPI.SearchController do
     )
   end
 
-  defp resource_search(:v2, "hashtags", query, _options) do
+  defp resource_search(:v2, "hashtags", query, options) do
     tags_path = Web.base_url() <> "/tag/"
 
     query
-    |> prepare_tags()
+    |> prepare_tags(options)
     |> Enum.map(fn tag ->
       %{name: tag, url: tags_path <> tag}
     end)
   end
 
-  defp resource_search(:v1, "hashtags", query, _options) do
-    prepare_tags(query)
+  defp resource_search(:v1, "hashtags", query, options) do
+    prepare_tags(query, options)
   end
 
-  defp prepare_tags(query, add_joined_tag \\ true) do
+  defp prepare_tags(query, options) do
     tags =
       query
       |> preprocess_uri_query()
@@ -139,13 +139,20 @@ defmodule Pleroma.Web.MastodonAPI.SearchController do
 
     tags = Enum.map(tags, fn tag -> String.trim_leading(tag, "#") end)
 
-    if Enum.empty?(explicit_tags) && add_joined_tag do
-      tags
-      |> Kernel.++([joined_tag(tags)])
-      |> Enum.uniq_by(&String.downcase/1)
-    else
-      tags
-    end
+    tags =
+      if Enum.empty?(explicit_tags) && !options[:skip_joined_tag] do
+        add_joined_tag(tags)
+      else
+        tags
+      end
+
+    Pleroma.Pagination.paginate(tags, options)
+  end
+
+  defp add_joined_tag(tags) do
+    tags
+    |> Kernel.++([joined_tag(tags)])
+    |> Enum.uniq_by(&String.downcase/1)
   end
 
   # If `query` is a URI, returns last component of its path, otherwise returns `query`