摘要: nginx内嵌Perl脚本实现缩略图生成 安装所需软件 安装ImageMagick及Perl Imager: # yum install ImageMagick ImageMagick-perl...
安装ImageMagick及Perl Imager:
# yum install ImageMagick ImageMagick-perl perl-YAML# yum install giflib-devel libjpeg-devel libtiff-devel libpng-devel freetype-devel# cpan -i Imager
查看当前支持的图片格式:
# perl -MImager -e 'print join "\n", sort keys %Imager::formats'
安装nginx(启用HttpPerlModule):
# ./configure --with-http_perl_module --with-pcre# make && make install
nginx配置例子:
[root@centos191 lib]# cat /usr/local/nginx/conf/nginx.conf
... perl_modules perl/lib; perl_require resizer.pm; server { listen 80; server_name images.zrwm.com; root /data/www/qingluobo; index index.html; #error_page 404 /404.html; location /img { try_files $uri @rewrite; } location @rewrite { rewrite ^(.*)(.jpg|.JPG|.gif|.GIF|.png|.PNG)$ /scale$1$2 last; } location /scale { internal; perl resize::handler; } }...Perl脚本例子:
# mkdir -p /usr/local/nginx/perl/lib# cd /usr/local/nginx/perl/lib# cat resizer.pm
package resize;use nginx;use Image::Magick;our $base_dir="/data/www/qingluobo";our $image; sub handler { my $r = shift; return DECLINED unless $r->uri =~ m/\.thumb\.\d{1,}?x\d{1,}?\./; my $uri=$r->uri; $uri=~ s!^/scale!!; my $dest_file="$base_dir/$uri"; my @path_tokens=split("/", $uri); my $filename=pop @path_tokens; my @filename_tokens=split('\.', $filename); # We know the last part is the extension; # We know the one before that is the dimensions # We know that the one before that is the resize_to string my $ext=pop @filename_tokens; my $dimensions=pop @filename_tokens; pop @filename_tokens; $filename=join('.', @filename_tokens, $ext); my $real_file_path=join("/", $base_dir, @path_tokens, $filename); return DECLINED unless -f $real_file_path; my ($width,$height)=split("x", $dimensions); if ($height<1) { $dimensions=$width; } $image= new Image::Magick; $image->Read($real_file_path); $image->Scale($dimensions); $image->Write($dest_file); $r->sendfile($dest_file); return OK; } 1;__END__ 原图:http://images.zrwm.com/img/test.jpg
缩略图1:http://images.zrwm.com/img/test.thumb.400×400.jpg
缩略图2:http://images.zrwm.com/img/test.thumb.600×0.jpg
nginx配置例子:
server { listen 80; server_name images.zrwm.com; root /data/www/qingluobo; index index.html index.php; #error_page 404 /404.html; location ~ ^/thumbs/(.*) { try_files $uri @resize; expires 4h; } location @resize { internal; rewrite ^(?:.*)(?:.jpg|.JPG|.gif|.GIF|.png|.PNG)$ /resize.php?ReqURI=$uri last; } location = /resize.php { internal; fastcgi_pass 127.0.0.1:9000; #fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; }...}<?phpif ( empty($_GET['ReqURI']) ) { exit('Invalid Param for ReqURI');}$uri = $_GET['ReqURI'];// whether to allow creating new directory$locked_dir_creation = false;$source_path = dirname(str_replace('/thumbs', '',$uri));$base_dir = "/data/www/qingluobo";$path_tokens = explode('/', $uri);$filename = array_pop($path_tokens);if ( !preg_match('/(.*)_(\d+)x(\d+)_([1-3])\.(jpe?g|png|gif)/i', $filename, $matches) ){ header("Status: 404 Not Found"); echo 'invalid filename :' . $filename; exit;}$source_file = $base_dir . $source_path . '/' . $matches[1];if ( !is_file($source_file) ) { header("Status: 404 Not Found"); echo $filename . ' Not Found'; exit;}$dest_path = $base_dir . implode('/', $path_tokens);if ( !is_dir($dest_path) && $locked_dir_creation ) { header('Status: 403 Forbidden'); echo 'Directory creation is forbidden.'; exit;}$new_width = $target_width = $matches[2];$new_height = $target_height = $matches[3];$mode = $matches[4];$target_format = strtolower($matches[5]);$source_img = new Imagick($source_file);$dimension = $source_img->getImageGeometry();$orig_width = $dimension['width'];$orig_height = $dimension['height'];switch ($mode) { case '1': break; case '2': /*preserve aspect ratio, resize the image to specified box, resized image will be of specified dimension or smaller */ $new_height = $orig_height * $new_width / $orig_width; if ($new_height > $target_height) { $new_width = $orig_width * $target_height / $orig_height; $new_height = $target_height; } break; case '3': /*zoom and crop the image to fill the specified dimension*/ // crop to get desired aspect ration $desired_aspect = $target_width / $target_height; $orig_aspect = $orig_width / $orig_height; if ($desired_aspect > $orig_aspect) { $trim = $orig_height - ($orig_width / $desired_aspect); $source_img->cropImage($orig_width, $orig_height-$tirm, 0, $trim /2); } else { $trim = $orig_width - ($orig_height * $desired_aspect); $source_img->cropImage($orig_width-$trim, $orig_height, $trim/2, 0); } break;}/* default mode 1, stretch image to fit the specified dimensions without preserving aspect ratio */$source_img->resizeImage($new_width, $new_height, imagick::FILTER_LANCZOS, 1); if ( !is_dir($dest_path) && !mkdir($dest_path, 0755, true) ) { echo 'cannot create dir : ' . $dest_path; exit;}$dest_file = $dest_path . '/' . $matches[0];//file_put_contents($dest_file, $source_img);clearstatcache($dest_path);$source_img->writeImage($dest_file);header("Content-Type: image/$target_format");echo $source_img; 原图：http://images.zrwm.com/img/test.jpg
缩略图(mode 1):http://images.zrwm.com/thumbs/img/test.jpg_300x300_1.jpg
缩略图(mode 2):http://images.zrwm.com/thumbs/img/test.jpg_300x300_2.jpg
缩略图(mode 3):http://images.zrwm.com/thumbs/img/test.jpg_300x300_3.jpg
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