added json api php code
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173
api/json.php
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173
api/json.php
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<?php
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/**
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* BlueWeather
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*
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* PHP version 7.2
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*
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* @param locId
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* @param range (range[from]: from UNIX time; range[to]: to UNIX time)
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* @param maxVals (maximum measvals to be transmitted; if more are present in the timespan, the avarage will be calculated)
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*
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* @category Tools
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* @package BlueWeather
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* @author Dorian Zedler <dorian@itsblue.de>
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* @license GPLV3 gpl.com
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* @link itsblue.de
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*/
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require_once './config.php';
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header('Content-Type: application/json');
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header('Access-Control-Allow-Origin: *');
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$con = mysqli_connect($config['dbhost'], $config['dbuser'], $config['dbpassword'], $config['dbname']);
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if (!$con) {
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echo "<h1>Fatal internal Error! :-/</h1>";
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echo "Error connecting to database: " . mysqli_connect_error();
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http_response_code(500);
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exit();
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}
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if (isset($_GET['locId'])) {
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// get data of given location
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$locId = $con->real_escape_string($_GET['locId']);
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$range['from'] = $con->real_escape_string($_GET['range']['from']);
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$range['to'] = $con->real_escape_string($_GET['range']['to']);
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$maxVals = $con->real_escape_string($_GET['maxVals']);
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$sql = "SELECT * FROM `locations`
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WHERE`id`=$locId";
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$result = $con->query($sql);
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// only one row will be returned
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$data = $result->fetch_assoc();
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if (!isset($range['from']) || $range['from'] === "") {
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$range['from'] = time() - 24 * 60 * 60;
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}
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if (!isset($range['to']) || $range['to'] === "") {
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$range['to'] = time();
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}
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// get all measvalues of given location
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$sql = "SELECT M.measvalue,M.sensorid,M.timestamp FROM measvalues M
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JOIN sensors S ON M.sensorid = S.id
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JOIN locations L ON S.locationid=L.id
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WHERE L.id=$locId AND M.timestamp > " . $range['from'] . " AND M.timestamp < " . $range['to'] . "
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ORDER BY timestamp ASC";
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$result = $con->query($sql);
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while ($row = $result->fetch_assoc()) {
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$measvalues[] = $row;
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}
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// get all sensors of given location
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$sql = "SELECT * FROM `sensors`
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WHERE `locationid` = $locId";
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$result = $con->query($sql);
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//loop through the returned data
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while ($row = $result->fetch_assoc()) {
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unset($row['locationid']); // remove locId as it is redundant
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$sensors[] = $row;
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}
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// get all value types
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$sql = "SELECT * FROM `valuetypes`";
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$result = $con->query($sql);
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//loop through the returned data
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while ($row = $result->fetch_assoc()) {
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foreach ($sensors as $sensor) {
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if ($sensor['valuetypeid'] == $row['id']) {
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$valuetypes[] = $row;
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break;
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}
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}
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}
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if (isset($maxVals) && $maxVals > 0 && count($measvalues) > $maxVals) {
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// build the new measvalues array with respect to maxVals for each sensor
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$finalMeasvals = array();
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foreach ($sensors as $sensor) {
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$rawMeasvalsOfThisSensor = array();
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$finalMeasvalsOfThisSensor = array();
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foreach ($measvalues as $measvalue) {
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if ($measvalue["sensorid"] === $sensor["id"]) {
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array_push($rawMeasvalsOfThisSensor, $measvalue);
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}
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}
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$countOfValuesForAvarage = intval(round(count($rawMeasvalsOfThisSensor) / $maxVals, 0));
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$takenValuesForNextSum = 0;
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$tmpMeasvalueSum = 0;
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$tmpTimestampSum = 0;
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for ($i = 0; $i < count($rawMeasvalsOfThisSensor); $i++) {
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$measvalue = $rawMeasvalsOfThisSensor[$i];
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if ($measvalue["sensorid"] === $sensor["id"]) {
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$tmpMeasvalueSum += $measvalue["measvalue"];
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$tmpTimestampSum += $measvalue["timestamp"];
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$takenValuesForNextSum += 1;
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}
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if ($takenValuesForNextSum === $countOfValuesForAvarage || $i === count($rawMeasvalsOfThisSensor) - 1) {
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array_push($finalMeasvalsOfThisSensor, array("measvalue" => $tmpMeasvalueSum / $takenValuesForNextSum, "timestamp" => $tmpTimestampSum / $takenValuesForNextSum, "sensorid" => $sensor["id"]));
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$takenValuesForNextSum = 0;
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$tmpMeasvalueSum = 0;
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$tmpTimestampSum = 0;
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}
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}
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//print_r($finalMeasvalsOfThisSensor);
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$finalMeasvals = array_merge($finalMeasvals, $finalMeasvalsOfThisSensor);
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}
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$measvalues = $finalMeasvals;
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}
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// find actual range
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$min;
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$max;
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foreach ($measvalues as $value) {
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if ($value['timestamp'] < $min || !isset($min)) {
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$min = $value['timestamp'];
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} else if ($value['timestamp'] > $max || !isset($max)) {
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$max = $value['timestamp'];
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}
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}
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// add sensors and value types to data object
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$data['measvalues'] = $measvalues;
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$data['sensors'] = $sensors;
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$data['valuetypes'] = $valuetypes;
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$data['range'] = array('from' => $min, 'to' => $max);
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} else {
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// get all locations
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$sql = "SELECT * FROM `locations`";
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$result = $con->query($sql);
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//loop through the returned data
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while ($row = $result->fetch_assoc()) {
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$data[] = $row;
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}
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}
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http_response_code(200);
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echo json_encode($data);
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