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mobilizon/lib/service/geospatial/nominatim.ex
2020-01-28 20:15:59 +01:00

153 lines
4.9 KiB
Elixir

defmodule Mobilizon.Service.Geospatial.Nominatim do
@moduledoc """
[Nominatim](https://wiki.openstreetmap.org/wiki/Nominatim) backend.
"""
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])
@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, %{"features" => features}} <- Poison.decode(body) do
features |> process_data() |> Enum.filter(& &1)
else
_ -> []
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, %{"features" => features}} <- Poison.decode(body) do
features |> process_data() |> Enum.filter(& &1)
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")
endpoint = Keyword.get(options, :endpoint, @endpoint)
country_code = Keyword.get(options, :country_code)
zoom = Keyword.get(options, :zoom)
api_key = Keyword.get(options, :api_key, @api_key)
url =
case method do
:search ->
"#{endpoint}/search?format=geocodejson&q=#{URI.encode(args.q)}&limit=#{limit}&accept-language=#{
lang
}&addressdetails=1&namedetails=1"
:geocode ->
url =
"#{endpoint}/reverse?format=geocodejson&lat=#{args.lat}&lon=#{args.lon}&accept-language=#{
lang
}&addressdetails=1&namedetails=1"
if is_nil(zoom), do: url, else: url <> "&zoom=#{zoom}"
end
url = if is_nil(country_code), do: url, else: "#{url}&countrycodes=#{country_code}"
if is_nil(api_key), do: url, else: url <> "&key=#{api_key}"
end
defp process_data(features) do
features
|> Enum.map(fn %{
"geometry" => %{"coordinates" => coordinates},
"properties" => %{"geocoding" => geocoding}
} ->
address = process_address(geocoding)
%Address{address | geom: Provider.coordinates(coordinates)}
end)
end
defp process_address(geocoding) do
%Address{
country: Map.get(geocoding, "country"),
locality:
Map.get(geocoding, "city") || Map.get(geocoding, "town") || Map.get(geocoding, "county"),
region: Map.get(geocoding, "state"),
description: description(geocoding),
postal_code: Map.get(geocoding, "postcode"),
type: Map.get(geocoding, "type"),
street: street_address(geocoding),
origin_id: "nominatim:" <> to_string(Map.get(geocoding, "osm_id"))
}
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, "street") ->
Map.get(body, "street")
Map.has_key?(body, "pedestrian") ->
Map.get(body, "pedestrian")
true ->
""
end
Map.get(body, "housenumber", "") <> " " <> road
end
@address29_classes ["amenity", "shop", "tourism", "leisure"]
@address29_categories ["office"]
@spec description(map()) :: String.t()
defp description(body) do
description = Map.get(body, "name")
address = Map.get(body, "address")
description =
if Map.has_key?(body, "namedetails"),
do: body |> Map.get("namedetails") |> Map.get("name", description),
else: description
description = if is_nil(description), do: street_address(body), else: description
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