Force HTTPS and WWW in .htaccess - apache

Question

I start reading about a similar topic at this page .htaccess - how to force "www." in a generic way? and the solution was not, well almost what I am looking to do.
The problem : I need the user to be on HTTPS and on WWW to make my application working properly. But if some one click on a html link like:
www.example.com
The user will fall on my website with this :
https://www.www.example.com/
Here is my current .htaccess file.
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]
RewriteCond %{HTTPS} !=on
RewriteRule ^/?(.*) https://www.%{SERVER_NAME}/$1 [R=301,L]
</IfModule>
Is there any way to detect that the user already entered the WWW or is there a best practice to get the result I am looking for?
Thank you.

Answer 1

You are getting this behavior because http -> https rule is adding www\. in target URL without checking if URL is already starting with www.
You should replace both of your rules with this single rule and as a bonus avoid multiple redirects:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC,OR]
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://www.%1%{REQUEST_URI} [R=301,L,NE]