Add weather data with db cache (issue #4)
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<?php
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require 'required.php';
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require 'onlyloggedin.php';
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// Validate input
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if (is_empty($VARS['lat']) || is_empty($VARS['long'])) {
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sendError("Missing information.", true);
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}
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if (!preg_match('/-?[0-9]{1,3}\.[0-9]{2,}/', $VARS['lat'])) {
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sendError("Latitude (lat) is in the wrong format.", true);
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}
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if (!preg_match('/-?[0-9]{1,3}\.[0-9]{2,}/', $VARS['long'])) {
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sendError("Longitude (long) is in the wrong format.", true);
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}
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// Round to 2 digits (approx. 1.1km)
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$lat = number_format((float) $VARS['lat'], 2, '.', '');
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$long = number_format((float) $VARS['long'], 2, '.', '');
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// Delete old records
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$database->delete('weathercache', ["date[<]" => date('Y-m-d H:i:s', strtotime('-1 hour'))]);
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// If we don't get a cache hit, request from the API
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if (!$database->has('weathercache', ["AND" => ["latitude" => $lat, "longitude" => $long]])) {
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$weather = json_decode(file_get_contents("https://api.darksky.net/forecast/" . DARKSKY_APIKEY . "/$lat,$long"), TRUE);
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$currentjson = json_encode($weather['currently']);
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$database->insert('weathercache', ["latitude" => $lat, "longitude" => $long, "#date" => "NOW()", "currentjson" => $currentjson]);
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}
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// Build output array
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$output = ["status" => "OK", "currently" => []];
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// Get the cached record and put it in the output array
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$output['currently'] = json_decode($database->select('weathercache', 'currentjson', ["AND" => ["latitude" => $lat, "longitude" => $long]])[0], TRUE);
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// Re-encode the data to JSON and send to client
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echo json_encode($output);
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