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<?php
/**
* @license GNU GPLv3+
* @author Aleksander Machniak <alec@alec.pl>
*/
class identicon_engine
{
private $ident;
private $width;
private $height;
private $margin;
private $binary;
private $color;
private $bgcolor = '#F9F9F9';
private $mimetype = 'image/png';
private $palette = [
'#F44336', '#E91E63', '#9C27B0', '#673AB7', '#3F51B5', '#2196F3',
'#03A9F4', '#00BCD4', '#009688', '#4CAF50', '#8BC34A', '#CDDC39',
'#FFEB3B', '#FFC107', '#FF9800', '#FF5722', '#795548', '#607D8B',
];
private $grid = [
0, 1, 2, 1, 0,
3, 4, 5, 4, 3,
6, 7, 8, 7, 6,
9, 10, 11, 10, 9,
12, 13, 14, 13, 12,
];
const GRID_SIZE = 5;
const ICON_SIZE = 150;
/**
* Class constructor
*
* @param string $ident Unique identifier (email address)
* @param int $size Icon size in pixels
* @param string $bgcolor Icon background color
*/
public function __construct($ident, $size = null, $bgcolor = null)
{
if (!$size) {
$size = self::ICON_SIZE;
}
$this->ident = $ident;
$this->margin = (int) round($size / 10);
$this->width = (int) round(($size - $this->margin * 2) / self::GRID_SIZE) * self::GRID_SIZE + $this->margin * 2;
$this->height = $this->width;
if ($bgcolor) {
if (preg_match('/^#?[0-9a-f]{6}$/', $bgcolor)) {
if ($bgcolor[0] != '#') {
$bgcolor = "#{$bgcolor}";
}
$this->bgcolor = $bgcolor;
}
else if ($bgcolor === 'transparent') {
$this->bgcolor = $bgcolor;
}
}
$this->generate();
}
/**
* Returns image mimetype
*/
public function getMimetype()
{
return $this->mimetype;
}
/**
* Returns the image in binary form
*/
public function getBinary()
{
return $this->binary;
}
/**
* Sends the image to the browser
*/
public function sendOutput()
{
if ($this->binary) {
$rcmail = rcmail::get_instance();
$rcmail->output->future_expire_header(10 * 60);
header('Content-Type: ' . $this->mimetype);
header('Content-Size: ' . strlen($this->binary));
echo $this->binary;
return true;
}
return false;
}
/**
* Icon generator
*/
private function generate()
{
$ident = md5($this->ident, true);
// set icon color
$div = intval(255/count($this->palette));
$index = intval(ord($ident[0]) / $div);
$this->color = $this->palette[$index] ?? $this->palette[0];
// set cell size
$cell_width = ($this->width - $this->margin * 2) / self::GRID_SIZE;
$cell_height = ($this->height - $this->margin * 2) / self::GRID_SIZE;
// create a grid
foreach ($this->grid as $i => $idx) {
$row_num = intval($i / self::GRID_SIZE);
$cell_num_h = $i - $row_num * self::GRID_SIZE;
$this->grid[$i] = [
'active' => ord($ident[$idx]) % 2 > 0,
'x1' => $cell_width * $cell_num_h + $this->margin,
'y1' => $cell_height * $row_num + $this->margin,
'x2' => $cell_width * ($cell_num_h + 1) + $this->margin,
'y2' => $cell_height * ($row_num + 1) + $this->margin,
];
}
// really generate the image using supported methods
if (function_exists('imagepng')) {
$this->generateGD();
}
else {
// log an error
$error = [
'code' => 500,
'message' => "PHP-GD module not found. It's required by identicon plugin.",
];
rcube::raise_error($error, true, false);
}
}
/**
* GD-based icon generation worker
*/
private function generateGD()
{
// create an image, setup colors
$image = imagecreate($this->width, $this->height);
$color = $this->toRGB($this->color);
$color = imagecolorallocate($image, $color[0], $color[1], $color[2]);
if ($this->bgcolor === 'transparent') {
$bgcolor = imagecolorallocatealpha($image, 0, 0, 0, 127);
imagesavealpha($image, true);
}
else {
$bgcolor = $this->toRGB($this->bgcolor);
$bgcolor = imagecolorallocate($image, $bgcolor[0], $bgcolor[1], $bgcolor[2]);
}
imagefilledrectangle($image, 0, 0, $this->width, $this->height, $bgcolor);
// draw the grid created in self::generate()
foreach ($this->grid as $item) {
if (!empty($item['active'])) {
imagefilledrectangle($image, $item['x1'], $item['y1'], $item['x2'], $item['y2'], $color);
}
}
// generate an image and save it to a variable
ob_start();
imagepng($image, null, 6, PNG_ALL_FILTERS);
$this->binary = ob_get_contents();
ob_end_clean();
// cleanup
imagedestroy($image);
}
/**
* Convert #FFFFFF color format to 3-value RGB
*/
private function toRGB($color)
{
preg_match('/^#?([A-F0-9]{2})([A-F0-9]{2})([A-F0-9]{2})/i', $color, $m);
return [hexdec($m[1]), hexdec($m[2]), hexdec($m[3])];
}
}
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