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