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WordPress AJAX example for Liturgical Calendar API
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| jQuery(document).ready(function($) { | |
| var data = { | |
| 'action': 'call_litcal_api', | |
| 'nationalpreset': 'USA' | |
| }; | |
| // since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php | |
| jQuery.get(ajaxurl, data, function(response) { | |
| alert('Got this from the LitCal API: ' + response); | |
| }); | |
| }); |
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| define("TRANSIENT_PREFIX","LitCal_"); | |
| function callLitCalAPI(){ | |
| //build the querystring from the GET or POST parameters, we're using GET here... | |
| $querystring = ""; | |
| //see the allowed parameters here: https://johnromanodorazio.com/LiturgicalCalendar/dist/#/Main%20API%20endpoint/retrieveEventsGET | |
| $allowedParameters = ["diocesanpreset","nationalpreset","locale","epiphany","ascension","corpuschristi","year","returntype"]; | |
| $parameters = []; | |
| foreach($allowedParameters as $param){ | |
| if(isset($_GET[$param])){ | |
| $parameters[] = $param . "=" . $_GET[$param]; | |
| } | |
| } | |
| $querystring = implode("&",$parameters); | |
| //if we don't already have the information stored in a transient, | |
| //then we will call the API endpoint | |
| if (false === ($output = get_transient(TRANSIENT_PREFIX.md5($querystring)))) { | |
| //We will make a secure connection to the BibleGet service endpoint, | |
| //if this server's OpenSSL and CURL versions support TLSv1.2 | |
| $curl_version = curl_version(); | |
| $ssl_version = str_replace('OpenSSL/', '', $curl_version['ssl_version']); | |
| if (version_compare($curl_version['version'], '7.34.0', '>=') && version_compare($ssl_version, '1.0.1', '>=')) { | |
| //we should be good to go for secure SSL communication supporting TLSv1_2 | |
| $ch = curl_init("https://johnromanodorazio.com/LiturgicalCalendar/LitCalEngine.php?" . $querystring); | |
| curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, TRUE); | |
| curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); | |
| curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2); | |
| } else { | |
| $ch = curl_init("http://johnromanodorazio.com/LiturgicalCalendar/LitCalEngine.php?" . $querystring); | |
| } | |
| curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); | |
| if (ini_get('safe_mode') || ini_get('open_basedir')) { | |
| // if safe mode is on, we can't use some settings | |
| } else { | |
| curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE); | |
| curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE); | |
| } | |
| $output = curl_exec($ch); | |
| if ($output && !curl_errno($ch)) { | |
| //we seem to have successfully retrieved our JSON data from the API | |
| } else { | |
| $errs = new stdClass(); | |
| $errs->error = "There was an error communicating with the Liturgical Calendar API, please wait a few minutes and try again" . ': '' . curl_error($ch) . '': ' . $finalquery; | |
| $output = json_encode($errs); | |
| } | |
| curl_close($ch); | |
| //this will ensure that the API endpoint will not be called more than once every 7 days | |
| set_transient(TRANSIENT_PREFIX.md5($querystring), $output, 7 * 24 * HOUR_IN_SECONDS); | |
| } | |
| echo $output; | |
| wp_die(); | |
| } | |
| add_action('wp_ajax_call_litcal_api', 'callLitCalAPI'); |
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