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