diff options
Diffstat (limited to 'core/Controller')
| -rw-r--r-- | core/Controller/AvatarController.php | 160 |
1 files changed, 155 insertions, 5 deletions
diff --git a/core/Controller/AvatarController.php b/core/Controller/AvatarController.php index 36b12fbd79c..5b762a4fd3f 100644 --- a/core/Controller/AvatarController.php +++ b/core/Controller/AvatarController.php @@ -111,6 +111,136 @@ class AvatarController extends Controller { $this->timeFactory = $timeFactory; } + + /** + * @param int $r + * @param int $g + * @param int $b + * @return double[] Array containing h s l in [0, 1] range + */ + private function rgbToHsl($r, $g, $b) { + $r /= 255.0; + $g /= 255.0; + $b /= 255.0; + + $max = max($r, $g, $b); + $min = min($r, $g, $b); + + + $h = ($max + $min) / 2.0; + $l = ($max + $min) / 2.0; + + if($max === $min) { + $h = $s = 0; // Achromatic + } else { + $d = $max - $min; + $s = $l > 0.5 ? $d / (2 - $max - $min) : $d / ($max + $min); + switch($max) { + case $r: + $h = ($g - $b) / $d + ($g < $b ? 6 : 0); + break; + case $g: + $h = ($b - $r) / $d + 2.0; + break; + case $b: + $h = ($r - $g) / $d + 4.0; + break; + } + $h /= 6.0; + } + return [$h, $s, $l]; + + } + + /** + * @param string $text + * @return int[] Array containting r g b in the range [0, 255] + */ + private function avatarBackgroundColor($text) { + $hash = preg_replace('/[^0-9a-f]+/', '', $text); + + $hash = md5($hash); + $hashChars = str_split($hash); + + + // Init vars + $result = ['0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0']; + $rgb = [0, 0, 0]; + $sat = 0.70; + $lum = 0.68; + $modulo = 16; + + + // Splitting evenly the string + foreach($hashChars as $i => $char) { + $result[$i % $modulo] .= intval($char, 16); + } + + // Converting our data into a usable rgb format + // Start at 1 because 16%3=1 but 15%3=0 and makes the repartition even + for($count = 1; $count < $modulo; $count++) { + $rgb[$count%3] += (int)$result[$count]; + } + + // Reduce values bigger than rgb requirements + $rgb[0] %= 255; + $rgb[1] %= 255; + $rgb[2] %= 255; + + $hsl = $this->rgbToHsl($rgb[0], $rgb[1], $rgb[2]); + + // Classic formulla to check the brigtness for our eye + // If too bright, lower the sat + $bright = sqrt(0.299 * ($rgb[0] ** 2) + 0.587 * ($rgb[1] ** 2) + 0.114 * ($rgb[2] ** 2)); + if ($bright >= 200) { + $sat = 0.60; + } + + return $this->hslToRgb($hsl[0], $sat, $lum); + } + + /** + * @param double $h Heu in range [0, 1] + * @param double $s Saturation in range [0, 1] + * @param double $l Lightness in range [0, 1] + * @return int[] Array containging r g b in the range [0, 255] + */ + private function hslToRgb($h, $s, $l){ + $hue2rgb = function ($p, $q, $t){ + if($t < 0) { + $t += 1; + } + if($t > 1) { + $t -= 1; + } + if($t < 1/6) { + return $p + ($q - $p) * 6 * $t; + } + if($t < 1/2) { + return $q; + } + if($t < 2/3) { + return $p + ($q - $p) * (2/3 - $t) * 6; + } + return $p; + }; + + if($s == 0){ + $r = $l; + $g = $l; + $b = $l; // achromatic + }else{ + $q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s; + $p = 2 * $l - $q; + $r = $hue2rgb($p, $q, $h + 1/3); + $g = $hue2rgb($p, $q, $h); + $b = $hue2rgb($p, $q, $h - 1/3); + } + + return array(round($r * 255), round($g * 255), round($b * 255)); + } + + /** * @NoAdminRequired * @NoCSRFRequired @@ -135,11 +265,31 @@ class AvatarController extends Controller { ['Content-Type' => $avatar->getMimeType()]); } catch (NotFoundException $e) { $user = $this->userManager->get($userId); - $resp = new JSONResponse([ - 'data' => [ - 'displayname' => $user->getDisplayName(), - ], - ]); + $userDisplayName = $user->getDisplayName(); + $text = strtoupper(substr($userDisplayName, 0, 1)); + $backgroundColor = $this->avatarBackgroundColor($userDisplayName); + + $im = imagecreatetruecolor($size, $size); + $background = imagecolorallocate($im, $backgroundColor[0], $backgroundColor[1], $backgroundColor[2]); + $white = imagecolorallocate($im, 255, 255, 255); + imagefilledrectangle($im, 0, 0, $size, $size, $background); + + $font = __DIR__ . '/../../core/fonts/OpenSans-Light.woff'; + + $fontSize = $size * 0.4; + $box = imagettfbbox($fontSize, 0, $font, $text); + + $x = ($size - ($box[2] - $box[0])) / 2; + $y = ($size - ($box[1] - $box[7])) / 2; + $y -= $box[7]; + imagettftext($im, $fontSize, 0, $x, $y, $white, $font, $text); + + header('Content-Type: image/png'); + + imagepng($im); + imagedestroy($im); + + exit(); } catch (\Exception $e) { $resp = new JSONResponse([ 'data' => [ |