使用nginx image filter实现类OSS对象存储中对图片的实时处理

server {
		listen 80;
		server_name 127.0.0.1;
		charset utf-8;
		root /www/uploadfile;

		#拦截所有带“！”号的图片请求
		location ~* ^(.*\.(?:jpg|gif|png|jpeg|bmp))!(.*){
		   #rewrite ^(.*\.(?:jpg|gif|png))! $1;

		   #图片访问路径
		   set $filename $1;
		   #图片压缩尺寸
		   set $img_arg $2;
			#拆解处理尺寸参数，参数性质如200x400样式
		   if ($img_arg ~ "^(\d+)x(\d+)") {
			   set $img_width $1;
			   set $img_height $2;
			}

			if ($img_arg ~ "^(\d+)$") {
			   set $img_width $1;
			   set $img_height "-";
			}

			if ($img_arg ~ "^x(\d+)") {
			   set $img_width "-";
			   set $img_height $1;
			}

		   if ( $img_width = "" ){
				set $img_width 100;
		   }

		   if ( $img_height = ""){
				set $img_height 100;
		   }
			#使用内部跳转，将尺寸参数传递
		   echo_exec /_imgFilt;
		}
		#图片处理
		location /_imgFilt {
		   alias /www/uploadfile$filename;

		   image_filter resize $img_width $img_height;
		   image_filter_buffer 10M;
		}

		location ~ .*\.(swf|docx|doc|xls|xlsx|txt|pdf|ppt|pptx|mp3|zip|rar|tar|gz|mp4|ttf|ttc|fmap|fmi|theme)$ {
				add_header 'Access-Control-Allow-Origin' '*';
				add_header 'Access-Control-Allow-Headers' 'X-Requested-With';
				add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS';
				expires      30d;
		}
}