154 lines
4.9 KiB
Elixir
154 lines
4.9 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.Config
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alias Mobilizon.Service.Geospatial.Provider
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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, %{"features" => features}} <- Poison.decode(body) do
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features |> process_data() |> Enum.filter(& &1)
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else
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_ -> []
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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, %{"features" => features}} <- Poison.decode(body) do
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features |> process_data() |> Enum.filter(& &1)
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else
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_ -> []
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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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country_code = Keyword.get(options, :country_code)
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zoom = Keyword.get(options, :zoom)
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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=geocodejson&q=#{URI.encode(args.q)}&limit=#{limit}&accept-language=#{
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lang
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}&addressdetails=1&namedetails=1"
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:geocode ->
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url =
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"#{endpoint}/reverse?format=geocodejson&lat=#{args.lat}&lon=#{args.lon}&accept-language=#{
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lang
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}&addressdetails=1&namedetails=1"
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if is_nil(zoom), do: url, else: url <> "&zoom=#{zoom}"
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end
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url = if is_nil(country_code), do: url, else: "#{url}&countrycodes=#{country_code}"
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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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defp process_data(features) do
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features
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|> Enum.map(fn %{
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"geometry" => %{"coordinates" => coordinates},
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"properties" => %{"geocoding" => geocoding}
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} ->
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address = process_address(geocoding)
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%Address{address | geom: Provider.coordinates(coordinates)}
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end)
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end
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defp process_address(geocoding) do
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%Address{
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country: Map.get(geocoding, "country"),
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locality:
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Map.get(geocoding, "city") || Map.get(geocoding, "town") || Map.get(geocoding, "county"),
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region: Map.get(geocoding, "state"),
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description: description(geocoding),
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postal_code: Map.get(geocoding, "postcode"),
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type: Map.get(geocoding, "type"),
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street: street_address(geocoding),
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origin_id: "nominatim:" <> to_string(Map.get(geocoding, "osm_id"))
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}
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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, "street") ->
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Map.get(body, "street")
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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, "housenumber", "") <> " " <> 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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description = Map.get(body, "name")
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address = Map.get(body, "address")
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description =
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if Map.has_key?(body, "namedetails"),
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do: body |> Map.get("namedetails") |> Map.get("name", description),
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else: description
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description = if is_nil(description), do: street_address(body), else: description
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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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