mobilizon/lib/service/geospatial/mimirsbrunn.ex

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Elixir
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defmodule Mobilizon.Service.Geospatial.Mimirsbrunn do
@moduledoc """
[Mimirsbrunn](https://github.com/CanalTP/mimirsbrunn) backend.
## Issues
* Has trouble finding POIs.
* Doesn't support zoom level for reverse geocoding
"""
alias Mobilizon.Addresses.Address
2020-01-28 20:15:59 +01:00
alias Mobilizon.Service.Geospatial.Provider
alias Mobilizon.Service.HTTP.BaseClient
require Logger
@behaviour Provider
@endpoint Application.get_env(:mobilizon, __MODULE__) |> get_in([:endpoint])
@impl Provider
@doc """
Mimirsbrunn implementation for `c:Mobilizon.Service.Geospatial.Provider.geocode/3`.
"""
@spec geocode(number(), number(), keyword()) :: list(Address.t())
def geocode(lon, lat, options \\ []) do
url = build_url(:geocode, %{lon: lon, lat: lat}, options)
Logger.debug("Asking Mimirsbrunn for reverse geocoding with #{url}")
with {:ok, %{status: 200, body: body}} <- BaseClient.get(url),
{:ok, %{"features" => features}} <- Jason.decode(body) do
process_data(features)
else
_ -> []
end
end
@impl Provider
@doc """
Mimirsbrunn implementation for `c:Mobilizon.Service.Geospatial.Provider.search/2`.
"""
@spec search(String.t(), keyword()) :: list(Address.t())
def search(q, options \\ []) do
url = build_url(:search, %{q: q}, options)
Logger.debug("Asking Mimirsbrunn for addresses with #{url}")
with {:ok, %{status: 200, body: body}} <- BaseClient.get(url),
{:ok, %{"features" => features}} <- Jason.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)
case method do
:search ->
url = "#{endpoint}/autocomplete?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}"
end
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(%{"type" => "poi", "address" => address} = geocoding) do
address = process_address(address)
%Address{
address
| type: get_type(geocoding),
origin_id: Map.get(geocoding, "id"),
description: Map.get(geocoding, "name")
}
end
defp process_address(geocoding) do
%Address{
country: get_administrative_region(geocoding, "country"),
locality: Map.get(geocoding, "city"),
region: get_administrative_region(geocoding, "region"),
description: Map.get(geocoding, "name"),
postal_code: get_postal_code(geocoding),
street: street_address(geocoding),
origin_id: "mimirsbrunn:" <> Map.get(geocoding, "id"),
type: get_type(geocoding)
}
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
defp get_type(%{"type" => type}) when type in ["house", "street", "zone", "address"], do: type
defp get_type(%{"type" => "poi", "poi_types" => types})
when is_list(types) and length(types) > 0,
do: hd(types)["id"]
defp get_type(_), do: nil
defp get_administrative_region(
%{"administrative_regions" => administrative_regions},
administrative_level
) do
Enum.find_value(
administrative_regions,
&process_administrative_region(&1, administrative_level)
)
end
defp get_administrative_region(_, _), do: nil
defp process_administrative_region(%{"zone_type" => "country", "name" => name}, "country"),
do: name
defp process_administrative_region(%{"zone_type" => "state", "name" => name}, "region"),
do: name
defp process_administrative_region(_, _), do: nil
defp get_postal_code(%{"postcode" => nil}), do: nil
defp get_postal_code(%{"postcode" => postcode}), do: postcode |> String.split(";") |> hd()
end