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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.MastodonAPI.SearchController do
use Pleroma.Web, :controller
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.ControllerHelper
alias Pleroma.Web.Endpoint
alias Pleroma.Web.MastodonAPI.AccountView
alias Pleroma.Web.MastodonAPI.StatusView
alias Pleroma.Web.Plugs.OAuthScopesPlug
alias Pleroma.Web.Plugs.RateLimiter
require Logger
@search_limit 40
plug(Pleroma.Web.ApiSpec.CastAndValidate, replace_params: false)
# Note: Mastodon doesn't allow unauthenticated access (requires read:accounts / read:search)
plug(OAuthScopesPlug, %{scopes: ["read:search"], fallback: :proceed_unauthenticated})
# Note: on private instances auth is required (EnsurePublicOrAuthenticatedPlug is not skipped)
plug(RateLimiter, [name: :search] when action in [:search, :search2, :account_search])
defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.SearchOperation
def account_search(
%{assigns: %{user: user}, private: %{open_api_spex: %{params: %{q: query} = params}}} =
conn,
_
) do
accounts = User.search(query, search_options(params, user))
conn
|> put_view(AccountView)
|> render("index.json",
users: accounts,
for: user,
as: :user
)
end
def search2(conn, params), do: do_search(:v2, conn, params)
def search(conn, params), do: do_search(:v1, conn, params)
defp do_search(
version,
%{assigns: %{user: user}, private: %{open_api_spex: %{params: %{q: query} = params}}} =
conn,
_
) do
query = String.trim(query)
options = search_options(params, user)
timeout = Keyword.get(Repo.config(), :timeout, 15_000)
default_values = %{"statuses" => [], "accounts" => [], "hashtags" => []}
result =
default_values
|> Enum.map(fn {resource, default_value} ->
if params[:type] in [nil, resource] do
{resource, fn -> resource_search(version, resource, query, options) end}
else
{resource, fn -> default_value end}
end
end)
|> Task.async_stream(fn {resource, f} -> {resource, with_fallback(f)} end,
timeout: timeout,
on_timeout: :kill_task
)
|> Enum.reduce(default_values, fn
{:ok, {resource, result}}, acc ->
Map.put(acc, resource, result)
_error, acc ->
acc
end)
json(conn, result)
end
defp search_options(params, user) do
[
resolve: params[:resolve],
following: params[:following],
limit: min(params[:limit], @search_limit),
offset: params[:offset],
type: params[:type],
author: get_author(params),
embed_relationships: ControllerHelper.embed_relationships?(params),
for_user: user
]
|> Enum.filter(&elem(&1, 1))
end
defp resource_search(_, "accounts", query, options) do
accounts = with_fallback(fn -> User.search(query, options) end)
AccountView.render("index.json",
users: accounts,
for: options[:for_user],
embed_relationships: options[:embed_relationships]
)
end
defp resource_search(_, "statuses", query, options) do
statuses = with_fallback(fn -> Pleroma.Search.search(query, options) end)
StatusView.render("index.json",
activities: statuses,
for: options[:for_user],
as: :activity
)
end
defp resource_search(:v2, "hashtags", query, options) do
tags_path = Endpoint.url() <> "/tag/"
query
|> 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, options)
end
defp prepare_tags(query, options) do
tags =
query
|> preprocess_uri_query()
|> String.split(~r/[^#\w]+/u, trim: true)
|> Enum.uniq_by(&String.downcase/1)
explicit_tags = Enum.filter(tags, fn tag -> String.starts_with?(tag, "#") end)
tags =
if Enum.any?(explicit_tags) do
explicit_tags
else
tags
end
tags = Enum.map(tags, fn tag -> String.trim_leading(tag, "#") end)
tags =
if Enum.empty?(explicit_tags) && !options[:skip_joined_tag] do
add_joined_tag(tags)
else
tags
end
Pleroma.Pagination.paginate_list(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`
defp preprocess_uri_query(query) do
if query =~ ~r/https?:\/\// do
query
|> String.trim_trailing("/")
|> URI.parse()
|> Map.get(:path)
|> String.split("/")
|> Enum.at(-1)
else
query
end
end
defp joined_tag(tags) do
tags
|> Enum.map(fn tag -> String.capitalize(tag) end)
|> Enum.join()
end
defp with_fallback(f, fallback \\ []) do
try do
f.()
rescue
error ->
Logger.error("#{__MODULE__} search error: #{inspect(error)}")
fallback
end
end
defp get_author(%{account_id: account_id}) when is_binary(account_id),
do: User.get_cached_by_id(account_id)
defp get_author(_params), do: nil
end

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