490 lines
13 KiB
PHP
490 lines
13 KiB
PHP
<?php
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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;
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use OCP\Files\NotFoundException;
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use OCP\Files\NotPermittedException;
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use OCP\Files\SimpleFS\ISimpleFile;
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use OCP\Files\SimpleFS\ISimpleFolder;
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use OCP\IAvatar;
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use OCP\IConfig;
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use OCP\IImage;
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use OCP\IL10N;
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use OCP\ILogger;
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use OC\User\User;
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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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class Avatar implements IAvatar {
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/** @var ISimpleFolder */
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private $folder;
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/** @var IL10N */
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private $l;
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/** @var User */
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private $user;
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/** @var ILogger */
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private $logger;
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/** @var IConfig */
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private $config;
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/**
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* https://github.com/sebdesign/cap-height -- for 500px height
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* Open Sans cap-height is 0.72 and we want a 200px caps height size (0.4 letter-to-total-height ratio, 500*0.4=200). 200/0.72 = 278px.
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* 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
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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:600;font-size:278px;font-family:\'Open Sans\';text-anchor:middle;fill:#fff">{letter}</text>
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</svg>';
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/**
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* constructor
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*
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* @param ISimpleFolder $folder The folder where the avatars are
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* @param IL10N $l
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* @param User $user
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* @param ILogger $logger
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* @param IConfig $config
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*/
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public function __construct(ISimpleFolder $folder,
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IL10N $l,
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$user,
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ILogger $logger,
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IConfig $config) {
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$this->folder = $folder;
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$this->l = $l;
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$this->user = $user;
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$this->logger = $logger;
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$this->config = $config;
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}
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/**
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* @inheritdoc
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*/
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public function get($size = 64) {
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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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* Check if an avatar exists for the user
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*
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* @return bool
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*/
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public function exists() {
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return $this->folder->fileExists('avatar.jpg') || $this->folder->fileExists('avatar.png');
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}
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/**
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* sets the users avatar
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* @param IImage|resource|string $data An image object, imagedata or path to set a new avatar
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* @throws \Exception if the provided file is not a jpg or png image
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* @throws \Exception if the provided image is not valid
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* @throws NotSquareException if the image is not square
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* @return void
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*/
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public function set($data) {
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if ($data instanceof IImage) {
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$img = $data;
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$data = $img->data();
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} else {
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$img = new OC_Image();
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if (is_resource($data) && get_resource_type($data) === "gd") {
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$img->setResource($data);
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} elseif (is_resource($data)) {
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$img->loadFromFileHandle($data);
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} else {
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try {
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// detect if it is a path or maybe the images as string
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$result = @realpath($data);
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if ($result === false || $result === null) {
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$img->loadFromData($data);
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} else {
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$img->loadFromFile($data);
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}
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} catch (\Error $e) {
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$img->loadFromData($data);
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}
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}
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}
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$type = substr($img->mimeType(), -3);
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if ($type === 'peg') {
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$type = 'jpg';
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}
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if ($type !== 'jpg' && $type !== 'png') {
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throw new \Exception($this->l->t('Unknown filetype'));
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}
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if (!$img->valid()) {
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throw new \Exception($this->l->t('Invalid image'));
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}
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if (!($img->height() === $img->width())) {
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throw new NotSquareException($this->l->t('Avatar image is not square'));
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}
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$this->remove();
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$file = $this->folder->newFile('avatar.' . $type);
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$file->putContent($data);
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try {
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$generated = $this->folder->getFile('generated');
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$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', 'false');
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$generated->delete();
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} catch (NotFoundException $e) {
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//
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}
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$this->user->triggerChange('avatar', $file);
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}
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/**
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* remove the users avatar
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* @return void
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*/
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public function remove() {
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$avatars = $this->folder->getDirectoryListing();
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$this->config->setUserValue($this->user->getUID(), 'avatar', 'version',
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(int) $this->config->getUserValue($this->user->getUID(), 'avatar', 'version', 0) + 1);
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foreach ($avatars as $avatar) {
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$avatar->delete();
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}
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$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', 'true');
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$this->user->triggerChange('avatar', '');
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}
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/**
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* @inheritdoc
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*/
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public function getFile($size) {
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try {
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$ext = $this->getExtension();
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} catch (NotFoundException $e) {
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if (!$data = $this->generateAvatarFromSvg(1024)) {
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$data = $this->generateAvatar($this->user->getDisplayName(), 1024);
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}
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$avatar = $this->folder->newFile('avatar.png');
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$avatar->putContent($data);
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$ext = 'png';
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$this->folder->newFile('generated');
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$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', 'true');
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}
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if ($size === -1) {
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$path = 'avatar.' . $ext;
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} else {
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$path = 'avatar.' . $size . '.' . $ext;
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}
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try {
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$file = $this->folder->getFile($path);
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} catch (NotFoundException $e) {
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if ($size <= 0) {
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throw new NotFoundException;
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}
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if ($this->folder->fileExists('generated')) {
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if (!$data = $this->generateAvatarFromSvg($size)) {
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$data = $this->generateAvatar($this->user->getDisplayName(), $size);
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}
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} else {
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$avatar = new OC_Image();
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/** @var ISimpleFile $file */
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$file = $this->folder->getFile('avatar.' . $ext);
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$avatar->loadFromData($file->getContent());
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$avatar->resize($size);
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$data = $avatar->data();
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}
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try {
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$file = $this->folder->newFile($path);
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$file->putContent($data);
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} catch (NotPermittedException $e) {
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$this->logger->error('Failed to save avatar for ' . $this->user->getUID());
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throw new NotFoundException();
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}
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}
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if ($this->config->getUserValue($this->user->getUID(), 'avatar', 'generated', null) === null) {
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$generated = $this->folder->fileExists('generated') ? 'true' : 'false';
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$this->config->setUserValue($this->user->getUID(), 'avatar', 'generated', $generated);
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}
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return $file;
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}
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/**
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* Get the extension of the avatar. If there is no avatar throw Exception
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*
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* @return string
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* @throws NotFoundException
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*/
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private function getExtension() {
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if ($this->folder->fileExists('avatar.jpg')) {
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return 'jpg';
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} elseif ($this->folder->fileExists('avatar.png')) {
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return 'png';
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}
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throw new NotFoundException;
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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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* @return string
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*
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*/
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private function getAvatarVector(int $size): string {
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$userDisplayName = $this->user->getDisplayName();
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$bgRGB = $this->avatarBackgroundColor($userDisplayName);
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$bgHEX = sprintf("%02x%02x%02x", $bgRGB->r, $bgRGB->g, $bgRGB->b);
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$letter = mb_strtoupper(mb_substr($userDisplayName, 0, 1), 'UTF-8');
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$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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private 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/OpenSans-Semibold.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 $size
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* @return string
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*/
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private function generateAvatar($userDisplayName, $size) {
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$text = mb_strtoupper(mb_substr($userDisplayName, 0, 1), 'UTF-8');
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$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
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$im = imagecreatetruecolor($size, $size);
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$background = imagecolorallocate($im, $backgroundColor->r, $backgroundColor->g, $backgroundColor->b);
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$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/OpenSans-Semibold.ttf';
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$fontSize = $size * 0.4;
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list($x, $y) = $this->imageTTFCenter($im, $text, $font, $fontSize);
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imagettftext($im, $fontSize, 0, $x, $y, $white, $font, $text);
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ob_start();
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imagepng($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 $angle
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* @return Array
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*/
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protected function imageTTFCenter($image, string $text, string $font, int $size, $angle = 0): array {
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// Image width & height
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$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, $color2) {
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$count = $steps + 1;
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$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, $steps * 3)];
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}
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public function userChanged($feature, $oldValue, $newValue) {
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// We only change the avatar on display name changes
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if ($feature !== 'displayName') {
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return;
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}
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// If the avatar is not generated (so an uploaded image) we skip this
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if (!$this->folder->fileExists('generated')) {
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return;
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}
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$this->remove();
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}
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}
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