location ~ /upload/{
  if ($request_uri ~* ^/upload/(.+)_(\d+)x(\d+)\.(jpg|png|gif)$) {
    set $src $1;
    set $w $2;
    set $h $3;
    set $t $4;
    rewrite . /resize?src=$src&w=$w&h=$h&type=$t break;
  }
  proxy_pass    http://127.0.0.1:3000;
}

app.get('/resize',function(req,res){
  var src = req.query.src,
    width = req.query.w,
    height = req.query.h,
    type = req.query.type;
  var imgFile = uploadDir+src+'.'+type;
  var notFound = '不好意思，该图片不存在或已被删除!';
  var thumb = getThumbImg(src,width,height,type);
  if(isFileExists(imgFile)){
    if(isFileExists(thumb)){
      res.type(type).sendFile(__dirname+'/'+thumb);
    }else{
      imgResize(imgFile,thumb,width,height,type,res);
    }
  }else{
    res.status(404).send(notFound);
  }
});
function imgResize(f,th,w,h,t,r){
  var imgSize = sizeOf(f);
  if(!w||!h||w>=imgSize.width||h>=imgSize.height){
    r.type(t).sendFile(__dirname+'/'+f);
  }else{
    imageMagick(f)
      .resize(w,h,'!') 
      .stream(function(err, stdout, stderr) {
        if (err) {
          console.log(err);
          res.end();
        }
        var ws = fs.createWriteStream(th);
        stdout.pipe(ws);
        r.type(t);
        stdout.pipe(r);
      });
  }
}
function isFileExists(filePath){
  var bool = !0;
  try{
    fs.accessSync(filePath,fs.constants.F_OK);
  }catch(err){
    bool = !1;
  }
  return bool;
}

app.get(/^\/upload\/(.+)_(\d+)x(\d+)\.(jpg|png|gif)$/,function(req,res){
  var src = RegExp.$1,
    width = RegExp.$2,
    height = RegExp.$3,
    type = RegExp.$4;
  var imgFile = uploadDir+src+'.'+type;
  var notFound = '不好意思，该图片不存在或已被删除!';
  var thumb = getThumbImg(src,width,height,type);
  if(isFileExists(imgFile)){
    if(isFileExists(thumb)){
      res.type(type).sendFile(__dirname+'/'+thumb);
    }else{
      imgResize(imgFile,thumb,width,height,type,res);
    }
  }else{
    res.status(404).send(notFound);
  }
});

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^upload/(.+)_([0-9]+)x([0-9]+)\.(jpg|png|gif)$ resize.php?src=$1&w=$2&h=$3&type=$4 [L]

function getThumbImg($src,$w,$h,$type)
{
  global $thumbs;
  return $_SERVER['DOCUMENT_ROOT'].$thumbs.$src.'_'.$w.'_'.$h.'.'.$type;
}
function imgResize($f,$th,$w,$h,$t)
{
  $imagick = new Imagick();
  $imagick->readImage($_SERVER['DOCUMENT_ROOT'].'\\'.$f);
  $width = $imagick->getImageWidth();
  $height = $imagick->getImageHeight();
  if(!$w||!$h||$w>=$width||$h>=$height){
    header('Content-Type:image/'.$t);
    echo file_get_contents($_SERVER['DOCUMENT_ROOT'].'\\'.$f);
  }else{
    $imagick->stripImage();
    $imagick->cropThumbnailImage($w, $h);
    $imagick->writeImage($th);
    header('Content-Type:image/'.$t);
    echo $imagick->getImageBlob();
    $imagick->clear();
    $imagick->destroy();
  }
}

$uploadDir = "uploads/images/";
$thumbs = "uploads/thumbs/";
$src = $_GET['src'];
$width = $_GET['w'];
$height = $_GET['h'];
$type = $_GET['type'];
$imgFile = $uploadDir.$src.'.'.$type;
$notFound = '不好意思，该图片不存在或已被删除!';
$thumb = getThumbImg($src,$width,$height,$type);
if(file_exists($imgFile)){
  if(file_exists($thumb)){
    header('Content-Type:image/'.$type);
    echo file_get_contents($thumb);
  }else{
    imgResize($imgFile,$thumb,$width,$height,$type);
  }
}else{
  header("HTTP/1.0 404 Not Found");
  header("status: 404");
  echo $notFound;
}