mobilizon/lib/service/geospatial/photon.ex

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Elixir
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defmodule Mobilizon.Service.Geospatial.Photon do
@moduledoc """
[Photon](https://photon.komoot.de) backend.
"""
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alias Mobilizon.Addresses.Address
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alias Mobilizon.Service.Geospatial.Provider
alias Mobilizon.Service.HTTP.GeospatialClient
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require Logger
@behaviour Provider
@endpoint Application.get_env(:mobilizon, __MODULE__) |> get_in([:endpoint])
@impl Provider
@doc """
Photon implementation for `c:Mobilizon.Service.Geospatial.Provider.geocode/3`.
Note: It seems results are quite wrong.
"""
@spec geocode(number(), number(), keyword()) :: list(Address.t())
def geocode(lon, lat, options \\ []) do
:geocode
|> build_url(%{lon: lon, lat: lat}, options)
|> fetch_features
end
@impl Provider
@doc """
Photon implementation for `c:Mobilizon.Service.Geospatial.Provider.search/2`.
"""
@spec search(String.t(), keyword()) :: list(Address.t())
def search(q, options \\ []) do
:search
|> build_url(%{q: q}, options)
|> fetch_features
end
@spec build_url(atom(), map(), list()) :: String.t()
defp build_url(method, args, options) do
limit = Keyword.get(options, :limit, 10)
lang = Keyword.get(options, :lang, "en")
coords = Keyword.get(options, :coords, nil)
endpoint = Keyword.get(options, :endpoint, @endpoint)
case method do
:search ->
url = "#{endpoint}/api/?q=#{URI.encode(args.q)}&lang=#{lang}&limit=#{limit}"
if is_nil(coords), do: url, else: url <> "&lat=#{coords.lat}&lon=#{coords.lon}"
:geocode ->
"#{endpoint}/reverse?lon=#{args.lon}&lat=#{args.lat}&lang=#{lang}&limit=#{limit}"
end
end
@spec fetch_features(String.t()) :: list(Address.t())
defp fetch_features(url) do
Logger.debug("Asking photon with #{url}")
with {:ok, %{status: 200, body: body}} <- GeospatialClient.get(url),
%{"features" => features} <- body do
process_data(features)
else
_ ->
Logger.error("Asking photon with #{url}")
[]
end
end
defp process_data(features) do
features
|> Enum.map(fn %{"geometry" => geometry, "properties" => properties} ->
%Address{
country: Map.get(properties, "country"),
locality: Map.get(properties, "city"),
region: Map.get(properties, "state"),
description: Map.get(properties, "name") || street_address(properties),
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geom: geometry |> Map.get("coordinates") |> Provider.coordinates(),
postal_code: Map.get(properties, "postcode"),
street: properties |> street_address()
}
end)
end
defp street_address(properties) do
if Map.has_key?(properties, "housenumber") do
Map.get(properties, "housenumber") <> " " <> Map.get(properties, "street")
else
Map.get(properties, "street")
end
end
end