74 lines
2.3 KiB
Elixir
74 lines
2.3 KiB
Elixir
defmodule Mobilizon.Federation.ActivityStream.Converter.Post do
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@moduledoc """
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Post converter.
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This module allows to convert posts from ActivityStream format to our own
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internal one, and back.
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"""
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Federation.ActivityPub
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alias Mobilizon.Federation.ActivityPub.Utils
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alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
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alias Mobilizon.Posts.Post
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require Logger
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@behaviour Converter
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defimpl Convertible, for: Post do
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alias Mobilizon.Federation.ActivityStream.Converter.Post, as: PostConverter
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defdelegate model_to_as(post), to: PostConverter
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end
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@doc """
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Convert an post struct to an ActivityStream representation
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"""
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@impl Converter
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@spec model_to_as(Post.t()) :: map
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def model_to_as(
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%Post{author: %Actor{url: actor_url}, attributed_to: %Actor{url: creator_url}} = post
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) do
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%{
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"type" => "Article",
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"actor" => actor_url,
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"id" => post.url,
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"name" => post.title,
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"content" => post.body,
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"attributedTo" => creator_url,
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"published" => (post.publish_at || post.inserted_at) |> to_date()
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}
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end
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@doc """
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Converts an AP object data to our internal data structure.
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"""
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@impl Converter
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@spec as_to_model_data(map) :: {:ok, map} | {:error, any()}
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def as_to_model_data(
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%{"type" => "Article", "actor" => creator, "attributedTo" => group} = object
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) do
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with {:ok, %Actor{id: attributed_to_id}} <- get_actor(group),
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{:ok, %Actor{id: author_id}} <- get_actor(creator) do
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%{
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title: object["name"],
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body: object["content"],
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url: object["id"],
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attributed_to_id: attributed_to_id,
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author_id: author_id,
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local: false,
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publish_at: object["published"]
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}
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else
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{:error, err} -> {:error, err}
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err -> {:error, err}
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end
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end
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@spec get_actor(String.t() | map() | nil) :: {:ok, Actor.t()} | {:error, String.t()}
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defp get_actor(nil), do: {:error, "nil property found for actor data"}
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defp get_actor(actor), do: actor |> Utils.get_url() |> ActivityPub.get_or_fetch_actor_by_url()
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defp to_date(%DateTime{} = date), do: DateTime.to_iso8601(date)
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defp to_date(%NaiveDateTime{} = date), do: NaiveDateTime.to_iso8601(date)
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end
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