nextcloud/lib/private/Avatar.php

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