87 lines
2.8 KiB
Elixir
87 lines
2.8 KiB
Elixir
# Akkoma: The cooler fediverse server
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# Copyright © 2022- Akkoma Authors <https://akkoma.dev/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Akkoma.Collections.Fetcher do
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@moduledoc """
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Activitypub Collections fetching functions
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see: https://www.w3.org/TR/activitystreams-core/#paging
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"""
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alias Pleroma.Object.Fetcher
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alias Pleroma.Config
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require Logger
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@spec fetch_collection(String.t() | map()) :: {:ok, [Pleroma.Object.t()]} | {:error, any()}
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def fetch_collection(ap_id) when is_binary(ap_id) do
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with {:ok, page} <- Fetcher.fetch_and_contain_remote_object_from_id(ap_id) do
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{:ok, objects_from_collection(page)}
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else
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e ->
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Logger.error("Could not fetch collection #{ap_id} - #{inspect(e)}")
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e
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end
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end
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def fetch_collection(%{"type" => type} = page)
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when type in ["Collection", "OrderedCollection", "CollectionPage", "OrderedCollectionPage"] do
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{:ok, objects_from_collection(page)}
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end
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defp items_in_page(%{"type" => type, "orderedItems" => items})
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when is_list(items) and type in ["OrderedCollection", "OrderedCollectionPage"],
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do: items
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defp items_in_page(%{"type" => type, "items" => items})
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when is_list(items) and type in ["Collection", "CollectionPage"],
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do: items
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defp objects_from_collection(%{"type" => type, "orderedItems" => items} = page)
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when is_list(items) and type in ["OrderedCollection", "OrderedCollectionPage"],
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do: maybe_next_page(page, items)
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defp objects_from_collection(%{"type" => type, "items" => items} = page)
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when is_list(items) and type in ["Collection", "CollectionPage"],
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do: maybe_next_page(page, items)
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defp objects_from_collection(%{"type" => type, "first" => first})
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when is_binary(first) and type in ["Collection", "OrderedCollection"] do
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fetch_page_items(first)
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end
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defp objects_from_collection(%{"type" => type, "first" => %{"id" => id}})
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when is_binary(id) and type in ["Collection", "OrderedCollection"] do
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fetch_page_items(id)
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end
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defp objects_from_collection(_page), do: []
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defp fetch_page_items(id, items \\ []) do
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if Enum.count(items) >= Config.get([:activitypub, :max_collection_objects]) do
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items
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else
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with {:ok, page} <- Fetcher.fetch_and_contain_remote_object_from_id(id) do
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objects = items_in_page(page)
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if Enum.count(objects) > 0 do
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maybe_next_page(page, items ++ objects)
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else
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items
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end
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else
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{:error, "Object has been deleted"} ->
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items
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{:error, error} ->
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Logger.error("Could not fetch page #{id} - #{inspect(error)}")
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{:error, error}
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end
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end
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end
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defp maybe_next_page(%{"next" => id}, items) when is_binary(id) do
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fetch_page_items(id, items)
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end
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defp maybe_next_page(_, items), do: items
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end
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