This should work:
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.example\.com [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^/(.*)$ http://www.example.com/$1 [R=301,L]
RewriteCond %{HTTP_HOST} !^www\.example\.com [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{SERVER_PORT} ^443$
RewriteRule ^/(.*)$ https://www.example.com/$1 [R=301,L]
-john c
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