134 lines
4.1 KiB
Elixir
134 lines
4.1 KiB
Elixir
defmodule Mobilizon.Service.Geospatial.Nominatim do
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@moduledoc """
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[Nominatim](https://wiki.openstreetmap.org/wiki/Nominatim) backend.
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"""
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alias Mobilizon.Addresses.Address
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alias Mobilizon.Service.Geospatial.Provider
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alias Mobilizon.Config
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require Logger
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@behaviour Provider
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@endpoint Application.get_env(:mobilizon, __MODULE__) |> get_in([:endpoint])
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@api_key Application.get_env(:mobilizon, __MODULE__) |> get_in([:api_key])
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@impl Provider
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@doc """
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Nominatim implementation for `c:Mobilizon.Service.Geospatial.Provider.geocode/3`.
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"""
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@spec geocode(String.t(), keyword()) :: list(Address.t())
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def geocode(lon, lat, options \\ []) do
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user_agent = Keyword.get(options, :user_agent, Config.instance_user_agent())
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headers = [{"User-Agent", user_agent}]
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url = build_url(:geocode, %{lon: lon, lat: lat}, options)
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Logger.debug("Asking Nominatim for geocode with #{url}")
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with {:ok, %HTTPoison.Response{status_code: 200, body: body}} <-
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HTTPoison.get(url, headers),
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{:ok, body} <- Poison.decode(body) do
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[process_data(body)]
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end
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end
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@impl Provider
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@doc """
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Nominatim implementation for `c:Mobilizon.Service.Geospatial.Provider.search/2`.
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"""
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@spec search(String.t(), keyword()) :: list(Address.t())
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def search(q, options \\ []) do
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user_agent = Keyword.get(options, :user_agent, Config.instance_user_agent())
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headers = [{"User-Agent", user_agent}]
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url = build_url(:search, %{q: q}, options)
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Logger.debug("Asking Nominatim for addresses with #{url}")
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with {:ok, %HTTPoison.Response{status_code: 200, body: body}} <-
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HTTPoison.get(url, headers),
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{:ok, body} <- Poison.decode(body) do
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body |> Enum.map(fn entry -> process_data(entry) end) |> Enum.filter(& &1)
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end
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end
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@spec build_url(atom(), map(), list()) :: String.t()
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defp build_url(method, args, options) do
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limit = Keyword.get(options, :limit, 10)
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lang = Keyword.get(options, :lang, "en")
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endpoint = Keyword.get(options, :endpoint, @endpoint)
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api_key = Keyword.get(options, :api_key, @api_key)
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url =
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case method do
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:search ->
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"#{endpoint}/search?format=jsonv2&q=#{URI.encode(args.q)}&limit=#{limit}&accept-language=#{
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lang
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}&addressdetails=1"
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:geocode ->
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"#{endpoint}/reverse?format=jsonv2&lat=#{args.lat}&lon=#{args.lon}&addressdetails=1"
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end
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if is_nil(api_key), do: url, else: url <> "&key=#{api_key}"
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end
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@spec process_data(map()) :: Address.t()
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defp process_data(%{"address" => address} = body) do
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%Address{
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country: Map.get(address, "country"),
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locality: Map.get(address, "city"),
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region: Map.get(address, "state"),
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description: description(body),
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geom: [Map.get(body, "lon"), Map.get(body, "lat")] |> Provider.coordinates(),
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postal_code: Map.get(address, "postcode"),
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street: street_address(address),
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origin_id: "osm:" <> to_string(Map.get(body, "osm_id"))
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}
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rescue
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error in ArgumentError ->
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Logger.warn(inspect(error))
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nil
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end
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@spec street_address(map()) :: String.t()
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defp street_address(body) do
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road =
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cond do
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Map.has_key?(body, "road") ->
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Map.get(body, "road")
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Map.has_key?(body, "road") ->
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Map.get(body, "road")
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Map.has_key?(body, "pedestrian") ->
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Map.get(body, "pedestrian")
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true ->
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""
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end
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Map.get(body, "house_number", "") <> " " <> road
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end
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@address29_classes ["amenity", "shop", "tourism", "leisure"]
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@address29_categories ["office"]
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@spec description(map()) :: String.t()
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defp description(body) do
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if !Map.has_key?(body, "display_name") do
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Logger.warn("Address has no display name")
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raise ArgumentError, message: "Address has no display_name"
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end
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description = Map.get(body, "display_name")
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address = Map.get(body, "address")
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if (Map.get(body, "category") in @address29_categories or
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Map.get(body, "class") in @address29_classes) and Map.has_key?(address, "address29") do
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Map.get(address, "address29")
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else
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description
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end
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end
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end
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