htaccess - Force SSL and www with Domain in Subfolder - apache

Question

I'm using a cPanel host, which, unfortunately, does not allow me access to Apache conf files in order to set up any VirtualHosts. I have my domain in a subfolder. I'm now also trying to force SSL as well as forcing www.
My requirements:
Domain needs to be in a subfolder, since I also have other domains
Force SSL
Force www. in the URL
The following is what I have in my .htaccess file:
RewriteCond %{HTTP_HOST} ^(www.)?example.com$
RewriteCond %{REQUEST_URI} !^/subfolder/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /subfolder/$1
RewriteCond %{HTTP_HOST} ^(www.)example.com$
RewriteRule ^(/)?$ subfolder/index.php [L]
I've made various attempts that seem to get me one or two of my requirements, but not all of them at the same time.
Any help is appreciated.

Answer 1

I was almost there. After, the second line, I had to add a couple of RewriteConds. Not on HTTPS or, not on www:
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
The final set of rules:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www.)?example.com$
RewriteCond %{REQUEST_URI} !^/subfolder/
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
RewriteRule ^ https://www.example.com%{REQUEST_URI} [NE,L,R]
RewriteRule ^$ /subfolder/ [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /subfolder/$1 [L]
Tested, and it forces SSL, and WWW in the domain, and keeps everything in the subfolder.