xref: /webtrees/app/Http/RequestHandlers/MapDataExportGeoJson.php (revision b62a8ecaef02a45d7e018fdb0f702d4575d8d0de) 
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 <http://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    /** @var MapDataService */
44    private $map_data_service;
45
46    /**
47     * Dependency injection.
48     *
49     * @param MapDataService $map_data_service
50     */
51    public function __construct(MapDataService $map_data_service)
52    {
53        $this->map_data_service = $map_data_service;
54    }
55
56    /**
57     * @param ServerRequestInterface $request
58     *
59     * @return ResponseInterface
60     */
61    public function handle(ServerRequestInterface $request): ResponseInterface
62    {
63        $parent_id = $request->getAttribute('parent_id');
64
65        if ($parent_id === null) {
66            $parent = new PlaceLocation('');
67        } else {
68            $parent = $this->map_data_service->findById((int) $parent_id);
69        }
70
71        for ($tmp = $parent, $hierarchy = []; $tmp->id() !== null; $tmp = $tmp->parent()) {
72            $hierarchy[] = $tmp->locationName();
73        }
74
75        // Create the file name
76        $filename = preg_replace('/[^\p{L}]+/u', '-', $hierarchy[0] ?? 'Global') . '.geojson';
77
78        // Recursively search for child places
79        $features = [];
80        $queue    = [[
81            $parent->id(), array_reverse($hierarchy), $parent->latitude(), $parent->longitude()
82        ]];
83
84        while ($queue !== []) {
85            [$id, $hierarchy, $latitude, $longitude] = array_shift($queue);
86
87            if ($latitude !== null && !$longitude !== null) {
88                $features[] = [
89                    'type'       => 'Feature',
90                    'geometry'   => [
91                        'type'        => 'Point',
92                        'coordinates' => [
93                            (float) $longitude,
94                            (float) $latitude,
95                        ],
96                    ],
97                    'properties' => [
98                        'name' => implode(Gedcom::PLACE_SEPARATOR, array_reverse($hierarchy)),
99                    ],
100                ];
101            }
102
103            $query = DB::table('place_location');
104            // Data for the next level.
105
106            if ($id === null) {
107                $query->whereNull('parent_id');
108            } else {
109                $query->where('parent_id', '=', $id);
110            }
111
112            $rows = $query
113                ->orderBy('place', 'DESC')
114                ->select(['id', 'place', 'latitude', 'longitude'])
115                ->get();
116
117            $next_level = count($hierarchy);
118
119            foreach ($rows as $row) {
120                $hierarchy[$next_level] = $row->place;
121                array_unshift($queue, [$row->id, $hierarchy, $row->latitude, $row->longitude]);
122            }
123        }
124
125        $geojson = [
126            'type'     => 'FeatureCollection',
127            'features' => $features,
128        ];
129
130        $filename = addcslashes($filename, '"');
131
132        return response($geojson)
133            ->withHeader('Content-Type', 'application/vnd.geo+json')
134            ->withHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
135    }
136}
137