309 lines
9.2 KiB
Elixir
309 lines
9.2 KiB
Elixir
defmodule BDS.Posts do
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@moduledoc false
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import Ecto.Query
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alias BDS.Frontmatter
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alias BDS.Posts.Post
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alias BDS.Projects
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alias BDS.Repo
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alias BDS.Slug
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def create_post(attrs) do
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now = System.system_time(:second)
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project_id = attr(attrs, :project_id)
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title = normalize_title(attr(attrs, :title))
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base_slug = title |> default_slug_source() |> Slug.slugify()
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%Post{}
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|> Post.changeset(%{
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id: Ecto.UUID.generate(),
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project_id: project_id,
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title: title,
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slug: unique_slug(project_id, base_slug),
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excerpt: attr(attrs, :excerpt),
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content: attr(attrs, :content),
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status: :draft,
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author: attr(attrs, :author),
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created_at: now,
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updated_at: now,
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published_at: nil,
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file_path: "",
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checksum: attr(attrs, :checksum),
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tags: attr(attrs, :tags) || [],
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categories: attr(attrs, :categories) || [],
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template_slug: attr(attrs, :template_slug),
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language: attr(attrs, :language),
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do_not_translate: false,
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published_title: nil,
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published_content: nil,
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published_tags: nil,
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published_categories: nil,
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published_excerpt: nil
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})
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|> Repo.insert()
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end
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def update_post(post_id, attrs) do
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case Repo.get(Post, post_id) do
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nil ->
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{:error, :not_found}
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post ->
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with :ok <- validate_slug_change(post, attrs) do
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now = System.system_time(:second)
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updates =
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attrs
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|> normalize_updates(post)
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|> Map.put(:updated_at, now)
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|> maybe_reopen_published_post(post)
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post
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|> Post.changeset(updates)
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|> Repo.update()
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else
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{:error, changeset} -> {:error, changeset}
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end
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end
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end
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def publish_post(post_id) do
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case Repo.get(Post, post_id) do
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nil ->
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{:error, :not_found}
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%Post{} = post ->
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project = Projects.get_project!(post.project_id)
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published_at = post.published_at || System.system_time(:second)
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relative_path = build_post_relative_path(post.slug, post.created_at)
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full_path = Path.join(Projects.project_data_dir(project), relative_path)
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updated_at = System.system_time(:second)
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:ok = File.mkdir_p(Path.dirname(full_path))
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:ok = File.write(full_path, serialize_post_file(%{post | updated_at: updated_at}, published_at))
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post
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|> Post.changeset(%{
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status: :published,
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published_at: published_at,
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file_path: relative_path,
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content: nil,
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updated_at: updated_at
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})
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|> Repo.update()
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end
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end
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def delete_post(post_id) do
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case Repo.get(Post, post_id) do
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nil ->
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{:error, :not_found}
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%Post{} = post ->
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delete_post_file(post)
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Repo.delete!(post)
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{:ok, :deleted}
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end
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end
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def archive_post(post_id) do
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case Repo.get(Post, post_id) do
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nil ->
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{:error, :not_found}
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%Post{status: status} = post when status in [:draft, :published] ->
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post
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|> Post.changeset(%{status: :archived, updated_at: System.system_time(:second)})
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|> Repo.update()
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%Post{} = post ->
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{:error,
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post
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|> Post.changeset(%{})
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|> Ecto.Changeset.add_error(:status, "cannot archive archived post")}
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end
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end
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def get_post!(post_id), do: Repo.get!(Post, post_id)
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def rewrite_published_post(post_id) do
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post = Repo.get!(Post, post_id)
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if post.status == :published and post.file_path not in [nil, ""] do
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project = Projects.get_project!(post.project_id)
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full_path = Path.join(Projects.project_data_dir(project), post.file_path)
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body = published_post_body(post, full_path)
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:ok = File.mkdir_p(Path.dirname(full_path))
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:ok = File.write(full_path, serialize_post_file(%{post | content: body}, post.published_at || System.system_time(:second)))
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end
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:ok
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end
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defp normalize_updates(attrs, _post) do
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%{}
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|> maybe_put(:title, normalize_optional_title(attr(attrs, :title), attrs))
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|> maybe_put(:slug, attr(attrs, :slug))
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|> maybe_put(:excerpt, attr(attrs, :excerpt))
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|> maybe_put(:content, attr(attrs, :content))
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|> maybe_put(:status, attr(attrs, :status))
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|> maybe_put(:author, attr(attrs, :author))
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|> maybe_put(:published_at, attr(attrs, :published_at))
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|> maybe_put(:file_path, attr(attrs, :file_path))
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|> maybe_put(:checksum, attr(attrs, :checksum))
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|> maybe_put(:tags, attr(attrs, :tags))
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|> maybe_put(:categories, attr(attrs, :categories))
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|> maybe_put(:template_slug, attr(attrs, :template_slug))
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|> maybe_put(:language, attr(attrs, :language))
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|> maybe_put(:do_not_translate, attr(attrs, :do_not_translate))
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|> maybe_put(:published_title, attr(attrs, :published_title))
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|> maybe_put(:published_content, attr(attrs, :published_content))
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|> maybe_put(:published_tags, attr(attrs, :published_tags))
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|> maybe_put(:published_categories, attr(attrs, :published_categories))
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|> maybe_put(:published_excerpt, attr(attrs, :published_excerpt))
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end
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defp validate_slug_change(%Post{published_at: published_at} = post, attrs) when not is_nil(published_at) do
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case attr(attrs, :slug) do
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nil ->
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:ok
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slug when slug == post.slug ->
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:ok
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_slug ->
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{:error,
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post
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|> Post.changeset(%{})
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|> Ecto.Changeset.add_error(:slug, "cannot change slug after first publish")}
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end
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end
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defp validate_slug_change(_post, _attrs), do: :ok
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defp maybe_reopen_published_post(updates, %Post{status: :published} = post) do
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if published_content_change?(updates, post) do
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Map.put(updates, :status, :draft)
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else
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updates
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end
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end
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defp maybe_reopen_published_post(updates, _post), do: updates
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defp published_content_change?(updates, post) do
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Enum.any?([:title, :excerpt, :content, :author, :language, :template_slug, :tags, :categories, :do_not_translate], fn field ->
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case Map.fetch(updates, field) do
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{:ok, value} -> value != Map.get(post, field)
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:error -> false
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end
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end)
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end
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defp unique_slug(project_id, base_slug) do
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normalized = if base_slug in [nil, ""], do: "untitled", else: base_slug
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if slug_available?(project_id, normalized) do
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normalized
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else
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find_unique_slug(project_id, normalized, 2)
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end
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end
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defp find_unique_slug(project_id, base_slug, suffix) do
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candidate = "#{base_slug}-#{suffix}"
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if slug_available?(project_id, candidate) do
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candidate
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else
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find_unique_slug(project_id, base_slug, suffix + 1)
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end
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end
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defp slug_available?(project_id, slug) do
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not Repo.exists?(from post in Post, where: post.project_id == ^project_id and post.slug == ^slug)
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end
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defp maybe_put(map, _key, nil), do: map
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defp maybe_put(map, key, value), do: Map.put(map, key, value)
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defp normalize_title(nil), do: ""
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defp normalize_title(title), do: title
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defp normalize_optional_title(_title, attrs) do
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if has_attr?(attrs, :title), do: normalize_title(attr(attrs, :title)), else: nil
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end
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defp default_slug_source(""), do: "untitled"
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defp default_slug_source(title), do: title
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defp build_post_relative_path(slug, created_at) do
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datetime = DateTime.from_unix!(created_at)
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year = Integer.to_string(datetime.year)
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month = datetime.month |> Integer.to_string() |> String.pad_leading(2, "0")
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Path.join(["posts", year, month, "#{slug}.md"])
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end
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defp serialize_post_file(post, published_at) do
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Frontmatter.serialize_document(
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[
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{:id, post.id},
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{:title, post.title},
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{:slug, post.slug},
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{:excerpt, post.excerpt},
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{:status, :published},
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{:author, post.author},
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{:language, post.language},
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{:do_not_translate, post.do_not_translate},
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{:template_slug, post.template_slug},
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{:created_at, post.created_at},
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{:updated_at, post.updated_at},
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{:published_at, published_at},
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{:tags, post.tags || []},
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{:categories, post.categories || []}
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],
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post.content || ""
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)
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end
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defp published_post_body(%Post{content: content}, _full_path) when is_binary(content), do: content
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defp published_post_body(_post, full_path) do
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case File.read(full_path) do
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{:ok, contents} ->
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case String.split(contents, "\n---\n", parts: 2) do
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[_frontmatter, body] -> String.trim_trailing(body, "\n")
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_parts -> ""
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end
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{:error, _reason} ->
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""
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end
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end
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defp delete_post_file(%Post{project_id: _project_id, file_path: file_path}) when file_path in [nil, ""], do: :ok
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defp delete_post_file(%Post{} = post) do
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project = Projects.get_project!(post.project_id)
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full_path = Path.join(Projects.project_data_dir(project), post.file_path)
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case File.rm(full_path) do
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:ok -> :ok
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{:error, :enoent} -> :ok
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{:error, reason} -> {:error, reason}
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end
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end
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defp has_attr?(attrs, key) do
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Map.has_key?(attrs, key) or Map.has_key?(attrs, Atom.to_string(key))
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end
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defp attr(attrs, key) do
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cond do
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Map.has_key?(attrs, key) -> Map.get(attrs, key)
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Map.has_key?(attrs, Atom.to_string(key)) -> Map.get(attrs, Atom.to_string(key))
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true -> nil
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end
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end
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end
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