nextcloud/lib/private/Avatar/Avatar.php

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<?php
declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
* @copyright 2018 John Molakvoæ <skjnldsv@protonmail.com>
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*
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Christopher Schäpers <kondou@ts.unde.re>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
* @author Olivier Mehani <shtrom@ssji.net>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author John Molakvoæ <skjnldsv@protonmail.com>
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*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
namespace OC\Avatar;
use OC\Color;
use OCP\Files\NotFoundException;
use OCP\IAvatar;
use OCP\ILogger;
use OC_Image;
use Imagick;
/**
* This class gets and sets users avatars.
*/
abstract class Avatar implements IAvatar {
/** @var ILogger */
protected $logger;
/**
* https://github.com/sebdesign/cap-height -- for 500px height
* Automated check: https://codepen.io/skjnldsv/pen/PydLBK/
* Noto Sans cap-height is 0.715 and we want a 200px caps height size
* (0.4 letter-to-total-height ratio, 500*0.4=200), so: 200/0.715 = 280px.
* Since we start from the baseline (text-anchor) we need to
* shift the y axis by 100px (half the caps height): 500/2+100=350
*
* @var string
*/
private $svgTemplate = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg width="{size}" height="{size}" version="1.1" viewBox="0 0 500 500" xmlns="http://www.w3.org/2000/svg">
<rect width="100%" height="100%" fill="#{fill}"></rect>
<text x="50%" y="350" style="font-weight:normal;font-size:280px;font-family:\'Noto Sans\';text-anchor:middle;fill:#fff">{letter}</text>
</svg>';
/**
* The base avatar constructor.
*
* @param ILogger $logger The logger
*/
public function __construct(ILogger $logger) {
$this->logger = $logger;
}
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/**
* Returns the user display name.
*
* @return string
*/
abstract public function getDisplayName(): string;
/**
* Returns the first letter of the display name, or "?" if no name given.
*
* @return string
*/
private function getAvatarLetter(): string {
$displayName = $this->getDisplayName();
if (empty($displayName) === true) {
return '?';
} else {
return mb_strtoupper(mb_substr($displayName, 0, 1), 'UTF-8');
}
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}
/**
* @inheritdoc
*/
public function get($size = 64) {
$size = (int) $size;
try {
$file = $this->getFile($size);
} catch (NotFoundException $e) {
return false;
}
$avatar = new OC_Image();
$avatar->loadFromData($file->getContent());
return $avatar;
}
/**
* {size} = 500
* {fill} = hex color to fill
* {letter} = Letter to display
*
* Generate SVG avatar
*
* @param int $size The requested image size in pixel
* @return string
*
*/
protected function getAvatarVector(int $size): string {
$userDisplayName = $this->getDisplayName();
$bgRGB = $this->avatarBackgroundColor($userDisplayName);
$bgHEX = sprintf("%02x%02x%02x", $bgRGB->r, $bgRGB->g, $bgRGB->b);
$letter = $this->getAvatarLetter();
$toReplace = ['{size}', '{fill}', '{letter}'];
return str_replace($toReplace, [$size, $bgHEX, $letter], $this->svgTemplate);
}
/**
* Generate png avatar from svg with Imagick
*
* @param int $size
* @return string|boolean
*/
protected function generateAvatarFromSvg(int $size) {
if (!extension_loaded('imagick')) {
return false;
}
try {
$font = __DIR__ . '/../../core/fonts/NotoSans-Regular.ttf';
$svg = $this->getAvatarVector($size);
$avatar = new Imagick();
$avatar->setFont($font);
$avatar->readImageBlob($svg);
$avatar->setImageFormat('png');
$image = new OC_Image();
$image->loadFromData($avatar);
return $image->data();
} catch (\Exception $e) {
return false;
}
}
/**
* Generate png avatar with GD
*
* @param string $userDisplayName
* @param int $size
* @return string
*/
protected function generateAvatar($userDisplayName, $size) {
$letter = $this->getAvatarLetter();
$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
$im = imagecreatetruecolor($size, $size);
$background = imagecolorallocate(
$im,
$backgroundColor->r,
$backgroundColor->g,
$backgroundColor->b
);
$white = imagecolorallocate($im, 255, 255, 255);
imagefilledrectangle($im, 0, 0, $size, $size, $background);
$font = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
$fontSize = $size * 0.4;
list($x, $y) = $this->imageTTFCenter(
$im, $letter, $font, (int)$fontSize
);
imagettftext($im, $fontSize, 0, $x, $y, $white, $font, $letter);
ob_start();
imagepng($im);
$data = ob_get_contents();
ob_end_clean();
return $data;
}
/**
* Calculate real image ttf center
*
* @param resource $image
* @param string $text text string
* @param string $font font path
* @param int $size font size
* @param int $angle
* @return array
*/
protected function imageTTFCenter(
$image,
string $text,
string $font,
int $size,
$angle = 0
): array {
// Image width & height
$xi = imagesx($image);
$yi = imagesy($image);
// bounding box
$box = imagettfbbox($size, $angle, $font, $text);
// imagettfbbox can return negative int
$xr = abs(max($box[2], $box[4]));
$yr = abs(max($box[5], $box[7]));
// calculate bottom left placement
$x = intval(($xi - $xr) / 2);
$y = intval(($yi + $yr) / 2);
return array($x, $y);
}
/**
* Calculate steps between two Colors
* @param object Color $steps start color
* @param object Color $ends end color
* @return array [r,g,b] steps for each color to go from $steps to $ends
*/
private function stepCalc($steps, $ends) {
$step = array();
$step[0] = ($ends[1]->r - $ends[0]->r) / $steps;
$step[1] = ($ends[1]->g - $ends[0]->g) / $steps;
$step[2] = ($ends[1]->b - $ends[0]->b) / $steps;
return $step;
}
/**
* Convert a string to an integer evenly
* @param string $hash the text to parse
* @param int $maximum the maximum range
* @return int[] between 0 and $maximum
*/
private function mixPalette($steps, $color1, $color2) {
$palette = array($color1);
$step = $this->stepCalc($steps, [$color1, $color2]);
for ($i = 1; $i < $steps; $i++) {
$r = intval($color1->r + ($step[0] * $i));
$g = intval($color1->g + ($step[1] * $i));
$b = intval($color1->b + ($step[2] * $i));
$palette[] = new Color($r, $g, $b);
}
return $palette;
}
/**
* Convert a string to an integer evenly
* @param string $hash the text to parse
* @param int $maximum the maximum range
* @return int between 0 and $maximum
*/
private function hashToInt($hash, $maximum) {
$final = 0;
$result = array();
// Splitting evenly the string
for ($i = 0; $i < strlen($hash); $i++) {
// chars in md5 goes up to f, hex:16
$result[] = intval(substr($hash, $i, 1), 16) % 16;
}
// Adds up all results
foreach ($result as $value) {
$final += $value;
}
// chars in md5 goes up to f, hex:16
return intval($final % $maximum);
}
/**
* @param string $hash
* @return Color Object containting r g b int in the range [0, 255]
*/
public function avatarBackgroundColor(string $hash) {
// Normalize hash
$hash = strtolower($hash);
// Already a md5 hash?
if( preg_match('/^([0-9a-f]{4}-?){8}$/', $hash, $matches) !== 1 ) {
$hash = md5($hash);
}
// Remove unwanted char
$hash = preg_replace('/[^0-9a-f]+/', '', $hash);
$red = new Color(182, 70, 157);
$yellow = new Color(221, 203, 85);
$blue = new Color(0, 130, 201); // Nextcloud blue
// Number of steps to go from a color to another
// 3 colors * 6 will result in 18 generated colors
$steps = 6;
$palette1 = $this->mixPalette($steps, $red, $yellow);
$palette2 = $this->mixPalette($steps, $yellow, $blue);
$palette3 = $this->mixPalette($steps, $blue, $red);
$finalPalette = array_merge($palette1, $palette2, $palette3);
return $finalPalette[$this->hashToInt($hash, $steps * 3)];
}
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}