xref: /webtrees/app/Http/RequestHandlers/MapDataExportGeoJson.php (revision 076e4c54ac11a9904fac036564df1cb3d89b3c22) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2021 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Http\RequestHandlers;
21
22use Fisharebest\Webtrees\Gedcom;
23use Fisharebest\Webtrees\PlaceLocation;
24use Fisharebest\Webtrees\Services\MapDataService;
25use Illuminate\Database\Capsule\Manager as DB;
26use Psr\Http\Message\ResponseInterface;
27use Psr\Http\Message\ServerRequestInterface;
28use Psr\Http\Server\RequestHandlerInterface;
29
30use function addcslashes;
31use function array_reverse;
32use function array_unshift;
33use function count;
34use function implode;
35use function preg_replace;
36use function response;
37
38/**
39 * Export geographic data.
40 */
41class MapDataExportGeoJson implements RequestHandlerInterface
42{
43    private MapDataService $map_data_service;
44
45    /**
46     * Dependency injection.
47     *
48     * @param MapDataService $map_data_service
49     */
50    public function __construct(MapDataService $map_data_service)
51    {
52        $this->map_data_service = $map_data_service;
53    }
54
55    /**
56     * @param ServerRequestInterface $request
57     *
58     * @return ResponseInterface
59     */
60    public function handle(ServerRequestInterface $request): ResponseInterface
61    {
62        $parent_id = $request->getAttribute('parent_id');
63
64        if ($parent_id === null) {
65            $parent = new PlaceLocation('');
66        } else {
67            $parent = $this->map_data_service->findById((int) $parent_id);
68        }
69
70        for ($tmp = $parent, $hierarchy = []; $tmp->id() !== null; $tmp = $tmp->parent()) {
71            $hierarchy[] = $tmp->locationName();
72        }
73
74        // Create the file name
75        $filename = preg_replace('/[^\p{L}]+/u', '-', $hierarchy[0] ?? 'Global') . '.geojson';
76
77        // Recursively search for child places
78        $features = [];
79        $queue    = [[
80            $parent->id(), array_reverse($hierarchy), $parent->latitude(), $parent->longitude()
81        ]];
82
83        while ($queue !== []) {
84            [$id, $hierarchy, $latitude, $longitude] = array_shift($queue);
85
86            if ($latitude !== null && !$longitude !== null) {
87                $features[] = [
88                    'type'       => 'Feature',
89                    'geometry'   => [
90                        'type'        => 'Point',
91                        'coordinates' => [
92                            (float) $longitude,
93                            (float) $latitude,
94                        ],
95                    ],
96                    'properties' => [
97                        'name' => implode(Gedcom::PLACE_SEPARATOR, array_reverse($hierarchy)),
98                    ],
99                ];
100            }
101
102            $query = DB::table('place_location');
103            // Data for the next level.
104
105            if ($id === null) {
106                $query->whereNull('parent_id');
107            } else {
108                $query->where('parent_id', '=', $id);
109            }
110
111            $rows = $query
112                ->orderBy('place', 'DESC')
113                ->select(['id', 'place', 'latitude', 'longitude'])
114                ->get();
115
116            $next_level = count($hierarchy);
117
118            foreach ($rows as $row) {
119                $hierarchy[$next_level] = $row->place;
120                array_unshift($queue, [$row->id, $hierarchy, $row->latitude, $row->longitude]);
121            }
122        }
123
124        $geojson = [
125            'type'     => 'FeatureCollection',
126            'features' => $features,
127        ];
128
129        $filename = addcslashes($filename, '"');
130
131        return response($geojson)
132            ->withHeader('Content-Type', 'application/vnd.geo+json')
133            ->withHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
134    }
135}
136