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<?php
namespace Kanboard\User\Avatar;
use Kanboard\Core\Base;
use Kanboard\Core\User\Avatar\AvatarProviderInterface;
/**
* Letter Avatar Provider
*
* The color hash algorithm is backported from the Javascript library color-hash
* Source: https://github.com/zenozeng/color-hash
* Author: Zeno Zeng (MIT License)
*
* @package avatar
* @author Frederic Guillot
*/
class LetterAvatarProvider extends Base implements AvatarProviderInterface
{
protected $lightness = array(0.35, 0.5, 0.65);
protected $saturation = array(0.35, 0.5, 0.65);
/**
* Render avatar html
*
* @access public
* @param array $user
* @param int $size
* @return string
*/
public function render(array $user, $size)
{
$initials = $this->helper->user->getInitials($user['name'] ?: $user['username']);
$rgb = $this->getBackgroundColor($user['name'] ?: $user['username']);
return sprintf(
'<div class="avatar-letter" style="background-color: rgb(%d, %d, %d)" title="%s">%s</div>',
$rgb[0],
$rgb[1],
$rgb[2],
$this->helper->text->e($user['name'] ?: $user['username']),
$initials
);
}
/**
* Determine if the provider is active
*
* @access public
* @param array $user
* @return boolean
*/
public function isActive(array $user)
{
return true;
}
/**
* Get background color based on a string
*
* @param string $str
* @return array
*/
public function getBackgroundColor($str)
{
$hsl = $this->getHSL($str);
return $this->getRGB($hsl[0], $hsl[1], $hsl[2]);
}
/**
* Convert HSL to RGB
*
* @access protected
* @param integer $hue Hue ∈ [0, 360)
* @param integer $saturation Saturation ∈ [0, 1]
* @param integer $lightness Lightness ∈ [0, 1]
* @return array
*/
protected function getRGB($hue, $saturation, $lightness)
{
$hue /= 360;
$q = $lightness < 0.5 ? $lightness * (1 + $saturation) : $lightness + $saturation - $lightness * $saturation;
$p = 2 * $lightness - $q;
return array_map(function ($color) use ($q, $p) {
if ($color < 0) {
$color++;
}
if ($color > 1) {
$color--;
}
if ($color < 1/6) {
$color = $p + ($q - $p) * 6 * $color;
} else if ($color < 0.5) {
$color = $q;
} else if ($color < 2/3) {
$color = $p + ($q - $p) * 6 * (2/3 - $color);
} else {
$color = $p;
}
return round($color * 255);
}, array($hue + 1/3, $hue, $hue - 1/3));
}
/**
* Returns the hash in [h, s, l].
* Note that H ∈ [0, 360); S ∈ [0, 1]; L ∈ [0, 1];
*
* @access protected
* @param string $str
* @return int[]
*/
protected function getHSL($str)
{
$hash = $this->hash($str);
$hue = $hash % 359;
$hash = intval($hash / 360);
$saturation = $this->saturation[$hash % count($this->saturation)];
$hash = intval($hash / count($this->saturation));
$lightness = $this->lightness[$hash % count($this->lightness)];
return array($hue, $saturation, $lightness);
}
/**
* BKDR Hash (modified version)
*
* @access protected
* @param string $str
* @return integer
*/
protected function hash($str)
{
$seed = 131;
$seed2 = 137;
$hash = 0;
// Make hash more sensitive for short string like 'a', 'b', 'c'
$str .= 'x';
$max = intval(PHP_INT_MAX / $seed2);
for ($i = 0, $ilen = mb_strlen($str, 'UTF-8'); $i < $ilen; $i++) {
if ($hash > $max) {
$hash = intval($hash / $seed2);
}
$hash = $hash * $seed + $this->getCharCode(mb_substr($str, $i, 1, 'UTF-8'));
}
return $hash;
}
/**
* Backport of Javascript function charCodeAt()
*
* @access protected
* @param string $c
* @return integer
*/
protected function getCharCode($c)
{
list(, $ord) = unpack('N', mb_convert_encoding($c, 'UCS-4BE', 'UTF-8'));
return $ord;
}
}
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