nextcloud / server

lib/private/Avatar.php

Indentation +428 added lines, -428 removed lines

@@ -49,450 +49,450 @@
  */
 
 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"?>
+    /** @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 = $config;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function get($size = 64) {
-		try {
-			$file = $this->getFile($size);
-		} catch (NotFoundException $e) {
-			return false;
-		}
-
-		$avatar = new OC_Image();
-		$avatar->loadFromData($file->getContent());
-		return $avatar;
-	}
-
-	/**
-	 * Check if an avatar exists for the user
-	 *
-	 * @return bool
-	 */
-	public function exists() {
-
-		return $this->folder->fileExists('avatar.jpg') || $this->folder->fileExists('avatar.png');
-	}
-
-	/**
-	 * Check if the avatar of a user is a custom uploaded one
-	 *
-	 * @return bool
-	 */
-	public function isCustomAvatar(): bool {
-		return $this->config->getUserValue($this->user->getUID(), 'avatar', 'generated', 'false') !== 'true';
-	}
-
-	/**
-	 * 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);
-		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);
-	}	
-
-	/**
-	 * 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');
-		$this->user->triggerChange('avatar', '');
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function getFile($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;
-	}
+    /**
+     * 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 = $config;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function get($size = 64) {
+        try {
+            $file = $this->getFile($size);
+        } catch (NotFoundException $e) {
+            return false;
+        }
+
+        $avatar = new OC_Image();
+        $avatar->loadFromData($file->getContent());
+        return $avatar;
+    }
+
+    /**
+     * Check if an avatar exists for the user
+     *
+     * @return bool
+     */
+    public function exists() {
+
+        return $this->folder->fileExists('avatar.jpg') || $this->folder->fileExists('avatar.png');
+    }
+
+    /**
+     * Check if the avatar of a user is a custom uploaded one
+     *
+     * @return bool
+     */
+    public function isCustomAvatar(): bool {
+        return $this->config->getUserValue($this->user->getUID(), 'avatar', 'generated', 'false') !== 'true';
+    }
+
+    /**
+     * 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);
+        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);
+    }	
+
+    /**
+     * 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');
+        $this->user->triggerChange('avatar', '');
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getFile($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');
+    /**
+     * {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);
+        $toReplace = ['{size}', '{fill}', '{letter}'];
+        return str_replace($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);
-		}
+        // 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);
+        // 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
+        $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;
+        // 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);
+        $palette1 = $this->mixPalette($steps, $red, $yellow);
+        $palette2 = $this->mixPalette($steps, $yellow, $blue);
+        $palette3 = $this->mixPalette($steps, $blue, $red);
 
-		$finalPalette = array_merge($palette1, $palette2, $palette3);
+        $finalPalette = array_merge($palette1, $palette2, $palette3);
 
-		return $finalPalette[$this->hashToInt($hash, $steps * 3)];
-	}
+        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;
-		}
+    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 (!$this->folder->fileExists('generated')) {
-			return;
-		}
+        // If the avatar is not generated (so an uploaded image) we skip this
+        if (!$this->folder->fileExists('generated')) {
+            return;
+        }
 
-		$this->remove();
-	}
+        $this->remove();
+    }
 
 }