Nginx vhost redirect only certain URIs to ssl

gistfile1.txt

server {
	include listen_80;
	server_name www.example.com;

	root /home/chris/public_html/www.example.com/public;
	access_log /home/chris/public_html/www.example.com/logs/access.log;
	error_log /home/chris/public_html/www.example.com/logs/error.log;

	location ~ /\.git {
		deny all;
	}

	location / {
		# force ssl for login and admin pages
		rewrite ^/(admin|auth)(.*) https://$host$request_uri?;

		try_files $uri $uri/ /index.php$is_args$args;
	}

	location ~ \.php$ {
		fastcgi_pass php;
	}
}