94 lines
3.1 KiB
Elixir
94 lines
3.1 KiB
Elixir
defmodule Mobilizon.Service.Geospatial.Photon do
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@moduledoc """
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[Photon](https://photon.komoot.de) 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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@impl Provider
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@doc """
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Photon implementation for `c:Mobilizon.Service.Geospatial.Provider.geocode/3`.
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Note: It seems results are quite wrong.
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"""
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@spec geocode(number(), number(), 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 photon for reverse geocoding 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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process_data(features)
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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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Photon 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 photon 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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process_data(features)
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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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coords = Keyword.get(options, :coords, nil)
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endpoint = Keyword.get(options, :endpoint, @endpoint)
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case method do
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:search ->
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url = "#{endpoint}/api/?q=#{URI.encode(args.q)}&lang=#{lang}&limit=#{limit}"
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if is_nil(coords), do: url, else: url <> "&lat=#{coords.lat}&lon=#{coords.lon}"
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:geocode ->
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"#{endpoint}/reverse?lon=#{args.lon}&lat=#{args.lat}&lang=#{lang}&limit=#{limit}"
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end
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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 %{"geometry" => geometry, "properties" => properties} ->
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%Address{
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country: Map.get(properties, "country"),
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locality: Map.get(properties, "city"),
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region: Map.get(properties, "state"),
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description: Map.get(properties, "name") || street_address(properties),
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geom: geometry |> Map.get("coordinates") |> Provider.coordinates(),
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postal_code: Map.get(properties, "postcode"),
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street: properties |> street_address()
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}
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end)
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end
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defp street_address(properties) do
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if Map.has_key?(properties, "housenumber") do
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Map.get(properties, "housenumber") <> " " <> Map.get(properties, "street")
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else
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Map.get(properties, "street")
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end
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end
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end
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