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1 |
1 | <?php |
2 | namespace Fdsn\Webservices; |
3 | |
4 | use ArrayIterator; |
5 | use IteratorAggregate; |
6 | use Traversable; |
7 | |
8 | /** |
9 | * PHP library to access FDSN Webservices and request Catalogs |
10 | * |
11 | * @param string $fdsn_server Fdns webservice domain name (default: webservices.ms.ingv.it) |
12 | */ |
13 | abstract class Webservice implements IteratorAggregate { |
14 | /** |
15 | * @var Base URL to compile with FDSN server url |
16 | */ |
17 | public const basePath = 'https://%s/fdsnws/event/1'; |
18 | |
19 | /** |
20 | * @var Default server url |
21 | */ |
22 | public const defaultFdsnServer = 'webservices.ms.ingv.it'; |
23 | |
24 | /** |
25 | * @var Max supported version |
26 | */ |
27 | public const fdsnSupportedVersion = '^1.'; |
28 | |
29 | protected string $fdsnServer; |
30 | protected string $webserviceFullPath; |
31 | |
32 | protected array $arrayOfResults = array(); |
33 | protected string $version = ''; |
34 | |
35 | function __construct( string $fdsn_server = self::defaultFdsnServer ){ |
36 | |
37 | $this->fdsnServer = $fdsn_server; |
38 | |
39 | $this->webserviceFullPath = sprintf(self::basePath, |
40 | $this->fdsnServer |
41 | ); |
42 | |
43 | if( ! $this->fdsnSupportedVersion() ){ |
44 | // @codeCoverageIgnoreStart |
45 | throw new \ValueError(sprintf("[%s] Error fetching FDSN version from server %s", __METHOD__, $this->fdsnServer)); |
46 | // @codeCoverageIgnoreEnd |
47 | } |
48 | } |
49 | |
50 | /** |
51 | * Fetch data from selected FDSN server |
52 | * |
53 | * @return int number of data found |
54 | */ |
55 | abstract public function fetch():int; |
56 | |
57 | |
58 | /** |
59 | * Return the number of elems found |
60 | * @return int The number of elems found |
61 | */ |
62 | public function numRows():int { return count($this->arrayOfResults); } |
63 | |
64 | /** |
65 | * Get FDSN running version |
66 | * @return string FDSN running version (trimmed by newline) |
67 | */ |
68 | public function version():string{ return $this->version; } |
69 | |
70 | /** |
71 | * Iterate over catalogis found |
72 | * @return array array of \Fdsn\DataStructure\Catalog obj |
73 | */ |
74 | public function getIterator():Traversable { return new ArrayIterator($this->arrayOfResults); } |
75 | |
76 | /** |
77 | * Fetch data from selected FDSN server |
78 | * |
79 | * @return string downloaded string |
80 | */ |
81 | protected function getFetch(string $url):string{ |
82 | $curlSession = curl_init(); |
83 | curl_setopt_array($curlSession, array( |
84 | CURLOPT_URL => $url, |
85 | CURLOPT_HEADER => false, |
86 | CURLOPT_CUSTOMREQUEST => 'GET', |
87 | CURLOPT_RETURNTRANSFER => 1, |
88 | CURLOPT_TIMEOUT => 60 |
89 | ) |
90 | ); |
91 | $response = trim(curl_exec($curlSession)); |
92 | curl_close($curlSession); |
93 | |
94 | return $response; |
95 | } |
96 | |
97 | /** |
98 | * Check if FDSN server version is supported |
99 | */ |
100 | private function fdsnSupportedVersion():bool{ |
101 | $this->version = trim( $this->getFetch($this->webserviceFullPath . '/version') ); |
102 | |
103 | return preg_match('/' . self::fdsnSupportedVersion . '/', $this->version); |
104 | |
105 | } |
106 | |
107 | } |