Gyazo hosting

i.conf

server { #generic php-fpm setup, really
    server_name i;
    root /var/www/i/www;
    client_max_body_size 20m;
    index   index.php index.htm index.html;

    location ~ ^.+\.php$ {
        if ( -f $document_root/../maintenance) {
            return 503;
        }

        #fastcgi_pass    127.0.0.1:9000;
        #or
        fastcgi_pass    unix:/var/run/php5-fpm.sock;
        include         fastcgi_params;
        fastcgi_index index.php;

        fastcgi_split_path_info ^(.+\.php)(.*)$;
        fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param   PATH_INFO       $fastcgi_path_info;
        fastcgi_param   PATH_TRANSLATED $document_root$fastcgi_path_info;
    }

    location / {
        try_files $uri $uri/ /index.php;
    }

}

i.php

<?php

if(isset($_FILES['imagedata'])){
	$storage = 'i/';
	$ext = 'png';
	$id=sha1(file_get_contents($_FILES['imagedata']['tmp_name']));

	move_uploaded_file($_FILES['imagedata']['tmp_name'],sprintf('%s%s.%s',$storage,$id,$ext));
	$url = sprintf('http://%s/i/%s.%s',$_SERVER["HTTP_HOST"],$id,$ext);
	if(strpos($_SERVER["HTTP_USER_AGENT"],'Gyazo')!==false){
		echo $url;
	}else{
		header('Location: '.$url);
	}
}