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<?php
/**
* Handles visualization of GIS data
*/
declare(strict_types=1);
namespace PhpMyAdmin\Gis;
use PhpMyAdmin\Core;
use PhpMyAdmin\Sanitize;
use PhpMyAdmin\Util;
use TCPDF;
use const PNG_ALL_FILTERS;
use function array_merge;
use function base64_encode;
use function count;
use function imagecolorallocate;
use function imagecreatetruecolor;
use function imagedestroy;
use function imagefilledrectangle;
use function imagepng;
use function intval;
use function is_numeric;
use function mb_strlen;
use function mb_strpos;
use function mb_strtolower;
use function mb_substr;
use function ob_get_clean;
use function ob_start;
use function is_string;
/**
* Handles visualization of GIS data
*/
class GisVisualization
{
/** @var array Raw data for the visualization */
private $data;
/** @var string */
private $modifiedSql;
/** @var array Set of default settings values are here. */
private $settings = [
// Array of colors to be used for GIS visualizations.
'colors' => [
'#B02EE0',
'#E0642E',
'#E0D62E',
'#2E97E0',
'#BCE02E',
'#E02E75',
'#5CE02E',
'#E0B02E',
'#0022E0',
'#726CB1',
'#481A36',
'#BAC658',
'#127224',
'#825119',
'#238C74',
'#4C489B',
'#87C9BF',
],
// Hex values for abovementioned colours
'colors_hex' => [
[176, 46, 224],
[224, 100, 46],
[224, 214, 46],
[46, 151, 224],
[188, 224, 46],
[224, 46, 117],
[92, 224, 46],
[224, 176, 46],
[0, 34, 224],
[114, 108, 177],
[72, 26, 54],
[186, 198, 88],
[18, 114, 36],
[130, 81, 25],
[35, 140, 116],
[76, 72, 155],
[135, 201, 191],
],
// The width of the GIS visualization.
'width' => 600,
// The height of the GIS visualization.
'height' => 450,
];
/** @var array Options that the user has specified. */
private $userSpecifiedSettings = null;
/**
* Returns the settings array
*
* @return array the settings array
*
* @access public
*/
public function getSettings()
{
return $this->settings;
}
/**
* Factory
*
* @param string $sql_query SQL to fetch raw data for visualization
* @param array $options Users specified options
* @param int $row number of rows
* @param int $pos start position
*
* @return GisVisualization
*
* @access public
*/
public static function get($sql_query, array $options, $row, $pos)
{
return new GisVisualization($sql_query, $options, $row, $pos);
}
/**
* Get visualization
*
* @param array $data Raw data, if set, parameters other than $options will be
* ignored
* @param array $options Users specified options
*
* @return GisVisualization
*/
public static function getByData(array $data, array $options)
{
return new GisVisualization(null, $options, null, null, $data);
}
/**
* Check if data has SRID
*
* @return bool
*/
public function hasSrid()
{
foreach ($this->data as $row) {
if ($row['srid'] != 0) {
return true;
}
}
return false;
}
/**
* Stores user specified options.
*
* @param string $sql_query SQL to fetch raw data for visualization
* @param array $options Users specified options
* @param int $row number of rows
* @param int $pos start position
* @param array|null $data raw data. If set, parameters other than $options
* will be ignored
*
* @access public
*/
private function __construct($sql_query, array $options, $row, $pos, $data = null)
{
$this->userSpecifiedSettings = $options;
if (isset($data)) {
$this->data = $data;
} else {
$this->modifiedSql = $this->modifySqlQuery($sql_query, $row, $pos);
$this->data = $this->fetchRawData();
}
}
/**
* All the variable initialization, options handling has to be done here.
*
* @return void
*
* @access protected
*/
protected function init()
{
$this->handleOptions();
}
/**
* Returns sql for fetching raw data
*
* @param string $sql_query The SQL to modify.
* @param int $rows Number of rows.
* @param int $pos Start position.
*
* @return string the modified sql query.
*/
private function modifySqlQuery($sql_query, $rows, $pos)
{
$isMariaDb = $this->userSpecifiedSettings['isMariaDB'] === true;
$modified_query = 'SELECT ';
$spatialAsText = 'ASTEXT';
$spatialSrid = 'SRID';
$axisOrder = '';
if ($this->userSpecifiedSettings['mysqlVersion'] >= 50600) {
$spatialAsText = 'ST_ASTEXT';
$spatialSrid = 'ST_SRID';
}
// If MYSQL version >= 8.1 override default axis order
if ($this->userSpecifiedSettings['mysqlVersion'] >= 80010 && ! $isMariaDb) {
$axisOrder = ', \'axis-order=long-lat\'';
}
// If label column is chosen add it to the query
if (! empty($this->userSpecifiedSettings['labelColumn'])) {
$modified_query .= Util::backquote(
$this->userSpecifiedSettings['labelColumn']
)
. ', ';
}
// Wrap the spatial column with 'ST_ASTEXT()' function and add it
$modified_query .= $spatialAsText . '('
. Util::backquote($this->userSpecifiedSettings['spatialColumn'])
. $axisOrder . ') AS ' . Util::backquote(
$this->userSpecifiedSettings['spatialColumn']
)
. ', ';
// Get the SRID
$modified_query .= $spatialSrid . '('
. Util::backquote($this->userSpecifiedSettings['spatialColumn'])
. ') AS ' . Util::backquote('srid') . ' ';
// Append the original query as the inner query
$modified_query .= 'FROM (' . $sql_query . ') AS '
. Util::backquote('temp_gis');
// LIMIT clause
if (is_numeric($rows) && $rows > 0) {
$modified_query .= ' LIMIT ';
if (is_numeric($pos) && $pos >= 0) {
$modified_query .= $pos . ', ' . $rows;
} else {
$modified_query .= $rows;
}
}
return $modified_query;
}
/**
* Returns raw data for GIS visualization.
*
* @return array the raw data.
*/
private function fetchRawData()
{
global $dbi;
$modified_result = $dbi->tryQuery($this->modifiedSql);
if ($modified_result === false) {
return [];
}
$data = [];
while ($row = $dbi->fetchAssoc($modified_result)) {
$data[] = $row;
}
return $data;
}
/**
* A function which handles passed parameters. Useful if desired
* chart needs to be a little bit different from the default one.
*
* @return void
*
* @access private
*/
private function handleOptions()
{
if ($this->userSpecifiedSettings === null) {
return;
}
$this->settings = array_merge(
$this->settings,
$this->userSpecifiedSettings
);
}
/**
* Sanitizes the file name.
*
* @param string $file_name file name
* @param string $ext extension of the file
*
* @return string the sanitized file name
*
* @access private
*/
private function sanitizeName($file_name, $ext)
{
$file_name = Sanitize::sanitizeFilename($file_name);
// Check if the user already added extension;
// get the substring where the extension would be if it was included
$extension_start_pos = mb_strlen($file_name) - mb_strlen($ext) - 1;
$user_extension
= mb_substr(
$file_name,
$extension_start_pos,
mb_strlen($file_name)
);
$required_extension = '.' . $ext;
if (mb_strtolower($user_extension) != $required_extension) {
$file_name .= $required_extension;
}
return $file_name;
}
/**
* Handles common tasks of writing the visualization to file for various formats.
*
* @param string $file_name file name
* @param string $type mime type
* @param string $ext extension of the file
*
* @return void
*
* @access private
*/
private function writeToFile($file_name, $type, $ext)
{
$file_name = $this->sanitizeName($file_name, $ext);
Core::downloadHeader($file_name, $type);
}
/**
* Generate the visualization in SVG format.
*
* @return string the generated image resource
*
* @access private
*/
private function svg()
{
$this->init();
$output = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'
. "\n"
. '<svg version="1.1" xmlns:svg="http://www.w3.org/2000/svg"'
. ' xmlns="http://www.w3.org/2000/svg"'
. ' width="' . intval($this->settings['width']) . '"'
. ' height="' . intval($this->settings['height']) . '">'
. '<g id="groupPanel">';
$scale_data = $this->scaleDataSet($this->data);
$output .= $this->prepareDataSet($this->data, $scale_data, 'svg', '');
$output .= '</g></svg>';
return $output;
}
/**
* Get the visualization as a SVG.
*
* @return string the visualization as a SVG
*
* @access public
*/
public function asSVG()
{
return $this->svg();
}
/**
* Saves as a SVG image to a file.
*
* @param string $file_name File name
*
* @return void
*
* @access public
*/
public function toFileAsSvg($file_name)
{
$img = $this->svg();
$this->writeToFile($file_name, 'image/svg+xml', 'svg');
echo $img;
}
/**
* Generate the visualization in PNG format.
*
* @return resource the generated image resource
*
* @access private
*/
private function png()
{
$this->init();
// create image
$image = imagecreatetruecolor(
$this->settings['width'],
$this->settings['height']
);
// fill the background
$bg = imagecolorallocate($image, 229, 229, 229);
imagefilledrectangle(
$image,
0,
0,
$this->settings['width'] - 1,
$this->settings['height'] - 1,
$bg
);
$scale_data = $this->scaleDataSet($this->data);
$image = $this->prepareDataSet($this->data, $scale_data, 'png', $image);
return $image;
}
/**
* Get the visualization as a PNG.
*
* @return string the visualization as a PNG
*
* @access public
*/
public function asPng()
{
$img = $this->png();
// render and save it to variable
ob_start();
imagepng($img, null, 9, PNG_ALL_FILTERS);
imagedestroy($img);
$output = ob_get_clean();
// base64 encode
$encoded = base64_encode((string) $output);
return '<img src="data:image/png;base64,' . $encoded . '">';
}
/**
* Saves as a PNG image to a file.
*
* @param string $file_name File name
*
* @return void
*
* @access public
*/
public function toFileAsPng($file_name)
{
$img = $this->png();
$this->writeToFile($file_name, 'image/png', 'png');
imagepng($img, null, 9, PNG_ALL_FILTERS);
imagedestroy($img);
}
/**
* Get the code for visualization with OpenLayers.
*
* @return string the code for visualization with OpenLayers
*
* @todo Should return JSON to avoid eval() in gis_data_editor.js
* @access public
*/
public function asOl()
{
$this->init();
$scale_data = $this->scaleDataSet($this->data);
$output = 'if (typeof ol !== "undefined") {'
. 'var olCss = "js/vendor/openlayers/theme/ol.css";'
. '$(\'head\').append(\'<link rel="stylesheet" type="text/css" href=\'+olCss+\'>\');'
. 'var vectorLayer = new ol.source.Vector({});'
. 'var map = new ol.Map({'
. 'target: \'openlayersmap\','
. 'layers: ['
. 'new ol.layer.Tile({'
. 'source: new ol.source.OSM()'
. '}),'
. 'new ol.layer.Vector({'
. 'source: vectorLayer'
. '})'
. '],'
. 'view: new ol.View({'
. 'center: ol.proj.fromLonLat([37.41, 8.82]),'
. 'zoom: 4'
. '}),'
. 'controls: [new ol.control.MousePosition({'
. 'coordinateFormat: ol.coordinate.createStringXY(4),'
. 'projection: \'EPSG:4326\'}),'
. 'new ol.control.Zoom,'
. 'new ol.control.Attribution]'
. '});';
$output .= $this->prepareDataSet($this->data, $scale_data, 'ol', '')
. '}';
return $output;
}
/**
* Saves as a PDF to a file.
*
* @param string $file_name File name
*
* @return void
*
* @access public
*/
public function toFileAsPdf($file_name)
{
$this->init();
// create pdf
$pdf = new TCPDF(
'',
'pt',
$GLOBALS['cfg']['PDFDefaultPageSize'],
true,
'UTF-8',
false
);
// disable header and footer
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
//set auto page breaks
$pdf->SetAutoPageBreak(false);
// add a page
$pdf->AddPage();
$scale_data = $this->scaleDataSet($this->data);
$pdf = $this->prepareDataSet($this->data, $scale_data, 'pdf', $pdf);
// sanitize file name
$file_name = $this->sanitizeName($file_name, 'pdf');
$pdf->Output($file_name, 'D');
}
/**
* Convert file to image
*
* @param string $format Output format
*
* @return string File
*/
public function toImage($format)
{
if ($format === 'svg') {
return $this->asSVG();
}
if ($format === 'png') {
return $this->asPng();
}
if ($format === 'ol') {
return $this->asOl();
}
return '';
}
/**
* Convert file to given format
*
* @param string $filename Filename
* @param string $format Output format
*
* @return void
*/
public function toFile($filename, $format)
{
if ($format === 'svg') {
$this->toFileAsSvg($filename);
} elseif ($format === 'png') {
$this->toFileAsPng($filename);
} elseif ($format === 'pdf') {
$this->toFileAsPdf($filename);
}
}
/**
* Calculates the scale, horizontal and vertical offset that should be used.
*
* @param array $data Row data
*
* @return array an array containing the scale, x and y offsets
*
* @access private
*/
private function scaleDataSet(array $data)
{
$min_max = [
'maxX' => 0.0,
'maxY' => 0.0,
'minX' => 0.0,
'minY' => 0.0,
];
$border = 15;
// effective width and height of the plot
$plot_width = $this->settings['width'] - 2 * $border;
$plot_height = $this->settings['height'] - 2 * $border;
foreach ($data as $row) {
// Figure out the data type
$ref_data = $row[$this->settings['spatialColumn']];
if (! is_string($ref_data)) {
continue;
}
$type_pos = mb_strpos($ref_data, '(');
if ($type_pos === false) {
continue;
}
$type = mb_substr($ref_data, 0, $type_pos);
$gis_obj = GisFactory::factory($type);
if (! $gis_obj) {
continue;
}
$scale_data = $gis_obj->scaleRow(
$row[$this->settings['spatialColumn']]
);
// Update minimum/maximum values for x and y coordinates.
$c_maxX = (float) $scale_data['maxX'];
if ($min_max['maxX'] === 0.0 || $c_maxX > $min_max['maxX']) {
$min_max['maxX'] = $c_maxX;
}
$c_minX = (float) $scale_data['minX'];
if ($min_max['minX'] === 0.0 || $c_minX < $min_max['minX']) {
$min_max['minX'] = $c_minX;
}
$c_maxY = (float) $scale_data['maxY'];
if ($min_max['maxY'] === 0.0 || $c_maxY > $min_max['maxY']) {
$min_max['maxY'] = $c_maxY;
}
$c_minY = (float) $scale_data['minY'];
if ($min_max['minY'] !== 0.0 && $c_minY >= $min_max['minY']) {
continue;
}
$min_max['minY'] = $c_minY;
}
// scale the visualization
$x_ratio = ($min_max['maxX'] - $min_max['minX']) / $plot_width;
$y_ratio = ($min_max['maxY'] - $min_max['minY']) / $plot_height;
$ratio = $x_ratio > $y_ratio ? $x_ratio : $y_ratio;
$scale = $ratio != 0 ? 1 / $ratio : 1;
if ($x_ratio < $y_ratio) {
// center horizontally
$x = ($min_max['maxX'] + $min_max['minX'] - $plot_width / $scale) / 2;
// fit vertically
$y = $min_max['minY'] - ($border / $scale);
} else {
// fit horizontally
$x = $min_max['minX'] - ($border / $scale);
// center vertically
$y = ($min_max['maxY'] + $min_max['minY'] - $plot_height / $scale) / 2;
}
return [
'scale' => $scale,
'x' => $x,
'y' => $y,
'minX' => $min_max['minX'],
'maxX' => $min_max['maxX'],
'minY' => $min_max['minY'],
'maxY' => $min_max['maxY'],
'height' => $this->settings['height'],
];
}
/**
* Prepares and return the dataset as needed by the visualization.
*
* @param array $data Raw data
* @param array $scale_data Data related to scaling
* @param string $format Format of the visualization
* @param resource|TCPDF|string|false $results Image object in the case of png
* TCPDF object in the case of pdf
*
* @return mixed the formatted array of data
*
* @access private
*/
private function prepareDataSet(array $data, array $scale_data, $format, $results)
{
$color_number = 0;
// loop through the rows
foreach ($data as $row) {
$index = $color_number % count($this->settings['colors']);
// Figure out the data type
$ref_data = $row[$this->settings['spatialColumn']];
if (! is_string($ref_data)) {
continue;
}
$type_pos = mb_strpos($ref_data, '(');
if ($type_pos === false) {
continue;
}
$type = mb_substr($ref_data, 0, $type_pos);
$gis_obj = GisFactory::factory($type);
if (! $gis_obj) {
continue;
}
$label = '';
if (isset($this->settings['labelColumn'], $row[$this->settings['labelColumn']])) {
$label = $row[$this->settings['labelColumn']];
}
if ($format === 'svg') {
$results .= $gis_obj->prepareRowAsSvg(
$row[$this->settings['spatialColumn']],
$label,
$this->settings['colors'][$index],
$scale_data
);
} elseif ($format === 'png') {
$results = $gis_obj->prepareRowAsPng(
$row[$this->settings['spatialColumn']],
$label,
$this->settings['colors'][$index],
$scale_data,
$results
);
} elseif ($format === 'pdf' && $results instanceof TCPDF) {
$results = $gis_obj->prepareRowAsPdf(
$row[$this->settings['spatialColumn']],
$label,
$this->settings['colors'][$index],
$scale_data,
$results
);
} elseif ($format === 'ol') {
$results .= $gis_obj->prepareRowAsOl(
$row[$this->settings['spatialColumn']],
$row['srid'],
$label,
$this->settings['colors_hex'][$index],
$scale_data
);
}
$color_number++;
}
return $results;
}
/**
* Set user specified settings
*
* @param array $userSpecifiedSettings User specified settings
*
* @return void
*/
public function setUserSpecifiedSettings(array $userSpecifiedSettings)
{
$this->userSpecifiedSettings = $userSpecifiedSettings;
}
}
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