localavatar.php

<?php

/*
 This script works much like gravatar
 Put avatar files in $imagedir with the same name as the md5sum of the users emailaddress
*/

$imagedir = "/usr/share/mantis/www/avatar/images/";

$allOk = true;


$requestedfile = false;
$size = false;

/* Check for a size parameter */
if (isset($_GET["s"]) && ctype_alnum($_GET["s"]))
{
  if ($_GET["s"] <= 1000)
  {
    $size = $_GET["s"];
  }
}

/* Check for a id parameter */
if (isset($_GET["i"]) && ctype_alnum($_GET["i"]) && strlen($_GET["i"]) > 2 && preg_match("/^(\w{32})$/", $_GET["i"], $matches))
{
  $requestedfile = $_GET["i"];
}
else if (array_key_exists('PATH_INFO', $_SERVER) === true)
{
  /* Check for a id parameter */
  if (preg_match("/^.(\w{32}).*/", $_SERVER['PATH_INFO'], $matches))
  {
    $requestedfile = $matches[1];
    /* Found id parameter, check for a size parameter */
    if (preg_match("/^.*s=(\d+).*/", $_SERVER['PATH_INFO'], $matches))
    {
      if ($matches[1] <= 1000)
      {
        $size = $matches[1];
      }
    }
  }
  else
  {
    $allOk = false;
  }
}
else
{
  $allOk = false;
}

/* Check if file with the same name as id is found */
if ($allOk && !is_readable($imagedir.$requestedfile))
{
  $allOk = false;
}

if ($allOk)
{
  /* Check that file type of avatar can be read */
  $filetype = exif_imagetype($imagedir.$requestedfile);
  if ($filetype === false)
  {
    $allOk = false;
  }
}

if ($allOk)
{
  /* Send the header */
  header("Content-type: " . image_type_to_mime_type($filetype));
  /* If there was a size parameter */
  if ($size)
  {
    /* Resize avatar and crop if avatar is not rectangular */
    $image = imagecreatefromstring(file_get_contents($imagedir.$requestedfile));
    list($width, $height) = getimagesize($imagedir.$requestedfile);
    $newimg = resize_image($image, $width, $height, $size, $size, true);
    imagejpeg($newimg, "/tmp/".$requestedfile) or die("Error: Could not save\n");
    /* Output avatar */
    echo file_get_contents("/tmp/".$requestedfile);
  }
  else
  {
    /* Output avatar */
    echo file_get_contents($imagedir.$requestedfile);
  }
}
/* If something went wrong, load avatar from gravatar */
else if ($requestedfile != false)
{
  if (ctype_alnum($_GET["d"]) && ctype_alnum($_GET["r"]) && ctype_alnum($_GET["s"]))
  {
    echo file_get_contents("https://secure.gravatar.com/avatar/" . $requestedfile . "?d=".$_GET["d"]."&r=".$_GET["r"]."&s=" . $size);
  }
}


/* http://stackoverflow.com/questions/14649645/resize-image-in-php */
function resize_image($src, $width, $height, $w, $h, $crop=FALSE) {
  $r = $width / $height;
  $x = 0;
  $y = 0;
  if ($crop) {
    if ($width > $height) {
      $x = ($width - ceil($width-($width*abs($r-$w/$h))) )/2;
      $width = ceil($width-($width*abs($r-$w/$h)));
    } else {
      $y = ( $height - ceil($height-($height*abs($r-$w/$h))) )/2;
      $height = ceil($height-($height*abs($r-$w/$h)));
    }
    $newwidth = $w;
    $newheight = $h;
  } else {
    if ($w/$h > $r) {
      $newwidth = $h*$r;
      $newheight = $h;
    } else {
      $newheight = $w/$r;
      $newwidth = $w;
    }
  }
  $dst = imagecreatetruecolor($newwidth, $newheight);
  imagecopyresampled($dst, $src, 0, 0, $x, $y, $newwidth, $newheight, $width, $height);

  return $dst;
}

?>