mobilizon.chapril.org-mobil.../lib/service/geospatial/pelias.ex
2020-01-28 20:15:59 +01:00

133 lines
4.0 KiB
Elixir

defmodule Mobilizon.Service.Geospatial.Pelias do
@moduledoc """
[Pelias](https://pelias.io) backend.
Doesn't provide type of POI.
"""
alias Mobilizon.Addresses.Address
alias Mobilizon.Config
alias Mobilizon.Service.Geospatial.Provider
require Logger
@behaviour Provider
@endpoint Application.get_env(:mobilizon, __MODULE__) |> get_in([:endpoint])
@impl Provider
@doc """
Pelias implementation for `c:Mobilizon.Service.Geospatial.Provider.geocode/3`.
"""
@spec geocode(number(), number(), keyword()) :: list(Address.t())
def geocode(lon, lat, options \\ []) do
user_agent = Keyword.get(options, :user_agent, Config.instance_user_agent())
headers = [{"User-Agent", user_agent}]
url = build_url(:geocode, %{lon: lon, lat: lat}, options)
Logger.debug("Asking Pelias for reverse geocoding with #{url}")
with {:ok, %HTTPoison.Response{status_code: 200, body: body}} <-
HTTPoison.get(url, headers),
{:ok, %{"features" => features}} <- Poison.decode(body) do
process_data(features)
else
_ -> []
end
end
@impl Provider
@doc """
Pelias implementation for `c:Mobilizon.Service.Geospatial.Provider.search/2`.
"""
@spec search(String.t(), keyword()) :: list(Address.t())
def search(q, options \\ []) do
user_agent = Keyword.get(options, :user_agent, Config.instance_user_agent())
headers = [{"User-Agent", user_agent}]
url = build_url(:search, %{q: q}, options)
Logger.debug("Asking Pelias for addresses with #{url}")
with {:ok, %HTTPoison.Response{status_code: 200, body: body}} <-
HTTPoison.get(url, headers),
{:ok, %{"features" => features}} <- Poison.decode(body) do
process_data(features)
else
_ -> []
end
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)
country_code = Keyword.get(options, :country_code)
url =
case method do
:search ->
url =
"#{endpoint}/v1/autocomplete?text=#{URI.encode(args.q)}&lang=#{lang}&size=#{limit}"
if is_nil(coords),
do: url,
else: url <> "&focus.point.lat=#{coords.lat}&focus.point.lon=#{coords.lon}"
:geocode ->
"#{endpoint}/v1/reverse?point.lon=#{args.lon}&point.lat=#{args.lat}"
end
if is_nil(country_code), do: url, else: "#{url}&boundary.country=#{country_code}"
end
defp process_data(features) do
features
|> Enum.map(fn %{
"geometry" => %{"coordinates" => coordinates},
"properties" => properties
} ->
address = process_address(properties)
%Address{address | geom: Provider.coordinates(coordinates)}
end)
end
defp process_address(properties) do
%Address{
country: Map.get(properties, "country"),
locality: Map.get(properties, "locality"),
region: Map.get(properties, "region"),
description: Map.get(properties, "name"),
postal_code: Map.get(properties, "postalcode"),
street: street_address(properties),
origin_id: "pelias:#{Map.get(properties, "id")}",
type: get_type(properties)
}
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
@administrative_layers [
"neighbourhood",
"borough",
"localadmin",
"locality",
"county",
"macrocounty",
"region",
"macroregion",
"dependency"
]
defp get_type(%{"layer" => layer}) when layer in @administrative_layers, do: "administrative"
defp get_type(%{"layer" => "address"}), do: "house"
defp get_type(%{"layer" => "street"}), do: "street"
defp get_type(%{"layer" => "venue"}), do: "venue"
defp get_type(%{"layer" => _}), do: nil
end